{"id":1217,"date":"2026-05-20T05:04:47","date_gmt":"2026-05-20T05:04:47","guid":{"rendered":"https:\/\/pto-gearbox.net\/?p=1217"},"modified":"2026-05-20T05:04:47","modified_gmt":"2026-05-20T05:04:47","slug":"pto-speed-increaser-vs-gear-reducer-when-to-use-each","status":"publish","type":"post","link":"https:\/\/pto-gearbox.net\/sk\/pto-speed-increaser-vs-gear-reducer-when-to-use-each\/","title":{"rendered":"Zvy\u0161ova\u010d ot\u00e1\u010dok v\u00fdvodov\u00e9ho hriade\u013ea verzus reduk\u010dn\u00fd prevod: Kedy pou\u017ei\u0165 ktor\u00fd z nich"},"content":{"rendered":"
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Zvy\u0161ova\u010d ot\u00e1\u010dok v\u00fdvodov\u00e9ho hriade\u013ea verzus reduk\u010dn\u00fd prevod: Kedy pou\u017ei\u0165 ktor\u00fd z nich<\/h1>\n

Predstavte si radenie bicykla: n\u00edzky prevodov\u00fd stupe\u0148 zn\u00e1sobuje silu \u0161liapania pri st\u00fapan\u00ed do kopca na \u00fakor r\u00fdchlosti kolesa, zatia\u013e \u010do vysok\u00fd prevodov\u00fd stupe\u0148 zn\u00e1sobuje r\u00fdchlos\u0165 kolesa na rovn\u00fdch cest\u00e1ch na \u00fakor kr\u00fatiaceho momentu n\u00f4h. Prevodovka PTO rob\u00ed presne to ist\u00e9 \u2013 a v\u00fdber nespr\u00e1vneho smeru stoj\u00ed bu\u010f v\u00fdkon, alebo hardv\u00e9r.<\/p>\n

Porozpr\u00e1vajte sa s na\u0161imi odborn\u00edkmi na prevodovky<\/a><\/p>\n<\/div>\n<\/div>\n

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Z\u00e1kladn\u00fd princ\u00edp: R\u00fdchlos\u0165 a kr\u00fatiaci moment s\u00fa kompromisom<\/h2>\n

Ka\u017ed\u00e1 prevodovka PTO \u2013 \u010di u\u017e zvy\u0161uje alebo zni\u017euje r\u00fdchlos\u0165 \u2013 sa riadi rovnak\u00fdm riadiacim z\u00e1konom mechaniky: v akomko\u013evek prevodovom syst\u00e9me sa vstupn\u00fd v\u00fdkon rovn\u00e1 v\u00fdstupn\u00e9mu v\u00fdkonu m\u00ednus straty tren\u00edm. V\u00fdkon je s\u00fa\u010dinom kr\u00fatiaceho momentu a r\u00fdchlosti ot\u00e1\u010dania. Tak\u017ee ke\u010f prevodovka zv\u00fd\u0161i v\u00fdstupn\u00fa r\u00fdchlos\u0165 nad vstupn\u00fa r\u00fdchlos\u0165, mus\u00ed \u00famerne zn\u00ed\u017ei\u0165 v\u00fdstupn\u00fd kr\u00fatiaci moment. Naopak, ke\u010f zn\u00ed\u017ei v\u00fdstupn\u00fa r\u00fdchlos\u0165 pod vstupn\u00fa r\u00fdchlos\u0165, \u00famerne zv\u00fd\u0161i v\u00fdstupn\u00fd kr\u00fatiaci moment. Neexistuje \u017eiadna prevodovka, ktor\u00e1 by s\u00fa\u010dasne zn\u00e1sobila r\u00fdchlos\u0165 aj kr\u00fatiaci moment \u2013 \u200b\u200bz\u00e1kon zachovania energie to zakazuje.<\/p>\n

T\u00e1to z\u00e1sada m\u00e1 hlbok\u00e9 praktick\u00e9 d\u00f4sledky pre ka\u017ed\u00e9 n\u00e1radie montovan\u00e9 na traktor. Prevodovka v\u00fdvodov\u00e9ho hriade\u013ea<\/a> ktor\u00fd pren\u00e1\u0161a energiu do rota\u010dnej reza\u010dky, mus\u00ed ot\u00e1\u010da\u0165 \u0165a\u017ek\u00fdmi no\u017emi cez hust\u00fa veget\u00e1ciu a zakopan\u00fd odpad. No\u017ee nar\u00e1\u017eaj\u00fa na n\u00e1hly, mas\u00edvny odpor \u2013 skryt\u00fd pe\u0148, kame\u0148, sple\u0165 dr\u00f4ten\u00e9ho plota zakopan\u00e9ho v kr\u00edkoch. N\u00e1radie potrebuje hrub\u00fa rota\u010dn\u00fa silu pri strednej r\u00fdchlosti. Reduktor v\u00fdvodov\u00e9ho hriade\u013ea to zabezpe\u010d\u00ed presne takto: vezme 540 alebo 1 000 ot.\/min. v\u00fdvodov\u00e9ho hriade\u013ea a spomal\u00ed ich na pribli\u017ene 200 alebo 300 ot.\/min., pri\u010dom vyn\u00e1sob\u00ed dostupn\u00fd kr\u00fatiaci moment inverznou hodnotou reduk\u010dn\u00e9ho pomeru ot\u00e1\u010dok.<\/p>\n

Pohon hydraulick\u00e9ho \u010derpadla m\u00e1 opa\u010dn\u00fa po\u017eiadavku. Vn\u00fatorn\u00e9 komponenty \u010derpadla \u2013 ozuben\u00e9 koles\u00e1, lopatky alebo piesty \u2013 s\u00fa navrhnut\u00e9 tak, aby fungovali efekt\u00edvne pri 1 500 a\u017e 3 000 ot\u00e1\u010dkach za min\u00fatu. 540 ot\u00e1\u010dok za min\u00fatu v\u00fdvodov\u00e9ho hriade\u013ea je pr\u00edli\u0161 pomal\u00fdch na to, aby sa \u010derpadlo rozto\u010dilo v jeho kon\u0161truk\u010dnom bode. Prevodovka so zvy\u0161ovan\u00edm ot\u00e1\u010dok v\u00fdvodov\u00e9ho hriade\u013ea zvy\u0161uje r\u00fdchlos\u0165 ot\u00e1\u010dania faktorom 2 a\u017e 6, \u010d\u00edm sa dosahuj\u00fa vysok\u00e9 ot\u00e1\u010dky, ktor\u00e9 \u010derpadlo potrebuje, a z\u00e1rove\u0148 sa akceptuje ni\u017e\u0161\u00ed v\u00fdstupn\u00fd kr\u00fatiaci moment \u2013 \u200b\u200b\u010do je prijate\u013en\u00e9, preto\u017ee \u010derpadl\u00e1 generuj\u00fa silu prostredn\u00edctvom hydraulick\u00e9ho tlaku, nie mechanick\u00e9ho kr\u00fatiaceho momentu.<\/p>\n

\"Zv\u00fd\u0161enie<\/div>\n

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Vn\u00fatri reduk\u010dn\u00e9ho prevodu PTO: Mechanick\u00e1 architekt\u00fara<\/h2>\n

V\u00e4\u010d\u0161ina po\u013enohospod\u00e1rskych reduktorov v\u00fdvodov\u00e9ho hriade\u013ea pou\u017e\u00edva pravouhl\u00fd tvar, ktor\u00fd je zalo\u017een\u00fd na \u0161pir\u00e1lovom ku\u017ee\u013eovom ozubenom kolese. Vstupn\u00fd hriade\u013e, ktor\u00fd je spojen\u00fd s \u010dapom v\u00fdvodov\u00e9ho hriade\u013ea traktora pomocou dr\u00e1\u017ekovanej spojky, nesie \u0161pir\u00e1lov\u00fd ku\u017ee\u013eov\u00fd pastorok s mal\u00fdm priemerom. Tento pastorok zaber\u00e1 so \u0161pir\u00e1lov\u00fdm ku\u017ee\u013eov\u00fdm ozuben\u00fdm kolesom s v\u00e4\u010d\u0161\u00edm priemerom, ktor\u00e9 je namontovan\u00e9 na v\u00fdstupnom hriadeli a vych\u00e1dza z prevodovky pod uhlom 90 stup\u0148ov k vstupu. Pomer medzi po\u010dtom zubov na korunovom kolese a pastorku ur\u010duje zn\u00ed\u017eenie ot\u00e1\u010dok \u2013 12-zubov\u00e9 pastorok poh\u00e1\u0148aj\u00faci 36-zubov\u00e9 korunov\u00e9 koleso vytv\u00e1ra zn\u00ed\u017eenie v pomere 3:1, pri\u010dom premie\u0148a vstupn\u00e9 ot\u00e1\u010dky 540 ot.\/min na v\u00fdstupn\u00e9 ot\u00e1\u010dky 180 ot.\/min a z\u00e1rove\u0148 strojn\u00e1sobuje dostupn\u00fd kr\u00fatiaci moment.<\/p>\n

\u0160pir\u00e1lov\u00e9 ku\u017ee\u013eov\u00e9 ozuben\u00e9 koles\u00e1 sa uprednost\u0148uj\u00fa pred priamymi ku\u017ee\u013eov\u00fdmi ozuben\u00fdmi kolesami z rovnak\u00e9ho d\u00f4vodu, pre\u010do sa \u0161pir\u00e1lov\u00e9 ozuben\u00e9 koles\u00e1 uprednost\u0148uj\u00fa pred \u010deln\u00fdmi ozuben\u00fdmi kolesami v usporiadaniach s paraleln\u00fdmi hriade\u013emi: \u0161ikm\u00fd kontakt zubov sa postupne pohybuje po \u010delnej ploche ozuben\u00e9ho kolesa, \u010d\u00edm sa dosahuje plynulej\u0161\u00ed prenos kr\u00fatiaceho momentu a v\u00fdrazne ni\u017e\u0161\u00ed hluk. V po\u013enohospod\u00e1rskej prevodovke, ktor\u00e1 m\u00f4\u017ee po\u010das svojej \u017eivotnosti pracova\u0165 tis\u00edce hod\u00edn, zn\u00ed\u017een\u00e9 vibra\u010dn\u00e9 za\u0165a\u017eenie zo \u0161pir\u00e1lov\u00e9ho ku\u017ee\u013eov\u00e9ho ozuben\u00e9ho kolesa tie\u017e predl\u017euje \u017eivotnos\u0165 lo\u017e\u00edsk a puzdra v porovnan\u00ed s alternat\u00edvami s priamymi ku\u017ee\u013eov\u00fdmi ozuben\u00fdmi kolesami.<\/p>\n

Puzdro pravouhl\u00e9ho reduk\u010dn\u00e9ho prevodu mus\u00ed s\u00fa\u010dasne vykon\u00e1va\u0165 nieko\u013eko \u00faloh. Umiest\u0148uje vstupn\u00e9 a v\u00fdstupn\u00e9 lo\u017eisk\u00e1 s mikr\u00f3novou presnos\u0165ou, aby sa zabezpe\u010dilo spr\u00e1vne zarovnanie z\u00e1beru ozuben\u00fdch kolies pri za\u0165a\u017een\u00ed. Obsahuje k\u00fape\u013e s mazac\u00edm olejom a priv\u00e1dza mazivo rozstrekovan\u00edm do horn\u00fdch lo\u017e\u00edsk, ktor\u00e9 by inak be\u017eali nasucho. Poskytuje \u0161truktur\u00e1lne mont\u00e1\u017ene rozhranie \u2013 zvy\u010dajne \u0161tyri alebo \u0161es\u0165 otvorov pre skrutky v pr\u00edrubovom vzore \u2013 ktor\u00e9 sp\u00e1ja prevodovku s r\u00e1mom stroja. A mus\u00ed absorbova\u0165 reak\u010dn\u00fd kr\u00fatiaci moment zo z\u00e1beru ozuben\u00fdch kolies bez toho, aby sa dostato\u010dne vych\u00fdlilo, aby sa naru\u0161ilo zarovnanie lo\u017e\u00edsk.<\/p>\n

Liatina zost\u00e1va dominantn\u00fdm materi\u00e1lom krytov po\u013enohospod\u00e1rskych reduktorov, preto\u017ee pon\u00faka vynikaj\u00face tlmenie vibr\u00e1ci\u00ed, dobr\u00fa tepeln\u00fa vodivos\u0165, presn\u00fa zlievate\u013enos\u0165 pre tolerancie otvorov lo\u017e\u00edsk a prirodzen\u00fa odolnos\u0165 proti kor\u00f3zii vo vonkaj\u0161om po\u013enohospod\u00e1rskom prostred\u00ed. Hlin\u00edkov\u00e9 kryty sa objavuj\u00fa v niektor\u00fdch \u013eahk\u00fdch alebo vysokor\u00fdchlostn\u00fdch aplik\u00e1ci\u00e1ch, ktor\u00e9 pon\u00fakaj\u00fa ni\u017e\u0161iu hmotnos\u0165 a lep\u0161\u00ed odvod tepla na jednotku plochy povrchu, ale ni\u017e\u0161ia tuhos\u0165 hlin\u00edka znamen\u00e1, \u017ee na dosiahnutie rovnakej odolnosti vo\u010di vych\u00fdleniu s\u00fa potrebn\u00e9 hrub\u0161ie steny \u2013 \u010do \u010diasto\u010dne neguje v\u00fdhodu hmotnosti pri \u00farovniach kr\u00fatiaceho momentu typick\u00fdch pre pozemn\u00e9 n\u00e1radie.<\/p>\n

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\u2699\ufe0f Ako reduk\u010dn\u00fd pomer ovplyv\u0148uje spr\u00e1vanie n\u00e1radia<\/p>\n

Rota\u010dn\u00e1 kosa\u010dka s redukciou 1,47:1 (vstupn\u00e9 ot\u00e1\u010dky 540 ot.\/min., v\u00fdstupn\u00e9 ot\u00e1\u010dky 367 ot.\/min.) vytv\u00e1ra jemn\u00fd rez s vysokou r\u00fdchlos\u0165ou hrotu \u010depele, \u010do je ide\u00e1lne na dokon\u010dovacie kosenie na vylep\u0161en\u00fdch pastvin\u00e1ch. T\u00e1 ist\u00e1 kosa\u010dka s redukciou 1,92:1 (vstupn\u00e9 ot\u00e1\u010dky 540 ot.\/min., v\u00fdstupn\u00e9 ot\u00e1\u010dky 281 ot.\/min.) obetuje kvalitu rezu kv\u00f4li kr\u00fatiacemu momentu, \u010do jej umo\u017e\u0148uje prerez\u00e1va\u0165 hust\u00e9 kr\u00edky a strom\u010deky bez zastavenia. V\u00fdber reduk\u010dn\u00e9ho pomeru je preto rozhodnut\u00edm o pou\u017eit\u00ed, nielen mechanick\u00fdm \u2013 definuje mo\u017enosti a obmedzenia n\u00e1stroja v ter\u00e9ne.<\/p>\n<\/div>\n

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Vo vn\u00fatri zv\u00fd\u0161ova\u010da ot\u00e1\u010dok v\u00fdvodov\u00e9ho hriade\u013ea: Obr\u00e1ten\u00fd tok v\u00fdkonu<\/h2>\n

Zvy\u0161ova\u010d r\u00fdchlosti pou\u017e\u00edva rovnak\u00e9 typy ozuben\u00fdch kolies ako reduktor \u2013 \u010deln\u00e9, \u0161pir\u00e1lov\u00e9 alebo plan\u00e9tov\u00e9 \u2013 ale obracia pomer toku v\u00fdkonu. Ve\u013ek\u00e9, pomal\u00e9 ozuben\u00e9 koleso prij\u00edma energiu zo vstupu v\u00fdvodov\u00e9ho hriade\u013ea a mal\u00e9, r\u00fdchle ozuben\u00e9 koleso dod\u00e1va energiu na v\u00fdstup. V kon\u0161trukcii so \u0161pir\u00e1lov\u00fdm prevodom s paraleln\u00fdm hriade\u013eom poh\u00e1\u0148a vstup v\u00fdvodov\u00e9ho hriade\u013ea ve\u013ek\u00e9 \u0161pir\u00e1lov\u00e9 ozuben\u00e9 koleso, ktor\u00e9 zaber\u00e1 s men\u0161\u00edm ozuben\u00fdm kolesom na v\u00fdstupnom hriadeli. Pomer po\u010dtu zubov je obr\u00e1ten\u00fd: reduktor by mohol pou\u017ei\u0165 48-zubov\u00e9 ozuben\u00e9 koleso poh\u00e1\u0148aj\u00face 16-zubov\u00e9 ozuben\u00e9 koleso pre zv\u00fd\u0161enie r\u00fdchlosti 3:1 (a zodpovedaj\u00face zn\u00ed\u017eenie kr\u00fatiaceho momentu 3:1).<\/p>\n

In\u017einierske v\u00fdzvy pri zvy\u0161ovan\u00ed r\u00fdchlosti sa l\u00ed\u0161ia od v\u00fdziev pri reduktore v nieko\u013ek\u00fdch d\u00f4le\u017eit\u00fdch oh\u013eadoch. Po prv\u00e9, v\u00fdstupn\u00fd hriade\u013e sa ot\u00e1\u010da r\u00fdchlej\u0161ie ako vstupn\u00fd \u2013 \u010dasto dva a\u017e \u0161es\u0165kr\u00e1t r\u00fdchlej\u0161ie. To znamen\u00e1, \u017ee v\u00fdstupn\u00e9 lo\u017eisk\u00e1 musia zvl\u00e1da\u0165 vy\u0161\u0161ie r\u00fdchlosti, \u010do zvy\u0161uje odstrediv\u00e9 za\u0165a\u017eenie valiv\u00fdch telies, generuje viac tepla zo \u0161mykov\u00e9ho nam\u00e1hania maziva a vy\u017eaduje men\u0161ie v\u00f4le lo\u017e\u00edsk. Lo\u017eisko s \u017eivotnos\u0165ou 2 000 hod\u00edn pri 500 ot.\/min m\u00f4\u017ee pri rovnakom radi\u00e1lnom a axi\u00e1lnom za\u0165a\u017een\u00ed vydr\u017ea\u0165 iba 800 hod\u00edn pri 2 500 ot.\/min, preto\u017ee \u017eivotnos\u0165 lo\u017eiska sa so zvy\u0161uj\u00facou sa r\u00fdchlos\u0165ou skracuje pod\u013ea dobre zn\u00e1meho inverzn\u00e9ho vz\u0165ahu.<\/p>\n

Po druh\u00e9, tesnenie v\u00fdstupn\u00e9ho hriade\u013ea mus\u00ed pracova\u0165 pri vy\u0161\u0161\u00edch obvodov\u00fdch r\u00fdchlostiach. Pri 3 000 ot.\/min na hriadeli s priemerom 40 mm sa tesniaca hrana k\u013a\u017ee po povrchu hriade\u013ea r\u00fdchlos\u0165ou 6,3 metra za sekundu. Pri t\u00fdchto r\u00fdchlostiach tesniaca hrana generuje zna\u010dn\u00e9 trecie teplo, ktor\u00e9 \u010dasom stvrdne elastom\u00e9r a nakoniec sp\u00f4sob\u00ed netesnos\u0165 tesnenia. Vysokor\u00fdchlostn\u00e9 tesnenia pou\u017e\u00edvaj\u00fa materi\u00e1ly PTFE (tefl\u00f3n) na okraje alebo labyrintov\u00e9 tesnenia na zn\u00ed\u017eenie trenia a pred\u013a\u017eenie \u017eivotnosti \u2013 detail, ktor\u00fd odli\u0161uje komer\u010dn\u00e9 prevodovky so zvy\u0161ova\u010dom ot\u00e1\u010dok v\u00fdvodov\u00e9ho hriade\u013ea od ekonomick\u00fdch alternat\u00edv.<\/p>\n

Po tretie, po\u017eiadavky na mazanie sa menia pri vy\u0161\u0161\u00edch r\u00fdchlostiach. Straty v\u00edren\u00edm oleja sa zvy\u0161uj\u00fa s druhou mocninou r\u00fdchlosti ot\u00e1\u010dania, \u010do znamen\u00e1, \u017ee ozuben\u00e9 koleso ot\u00e1\u010daj\u00face sa pri 3 000 ot.\/min. generuje dev\u00e4\u0165kr\u00e1t v\u00e4\u010d\u0161ie straty v\u00edren\u00edm ako to ist\u00e9 ozuben\u00e9 koleso pri 1 000 ot.\/min. Zvy\u0161ova\u010de r\u00fdchlosti to kompenzuj\u00fa pou\u017eit\u00edm ni\u017e\u0161\u00edch hlad\u00edn oleja \u2013 pr\u00e1ve to\u013eko, aby sa ponorili zuby spodn\u00e9ho ozuben\u00e9ho kolesa \u2013 a spoliehan\u00edm sa na rozstrek a smerovan\u00fd tok oleja z ponoren\u00fdch ozuben\u00fdch kolies na mazanie horn\u00fdch lo\u017e\u00edsk. Niektor\u00e9 plan\u00e9tov\u00e9 zvy\u0161ova\u010de r\u00fdchlosti s vysok\u00fdm prevodov\u00fdm pomerom pou\u017e\u00edvaj\u00fa n\u00faten\u00e9 mazanie s vn\u00fatorn\u00fdm trochoidn\u00fdm \u010derpadlom poh\u00e1\u0148an\u00fdm z ozuben\u00e9ho kolesa, aby sa zabezpe\u010dilo dostato\u010dn\u00e9 dod\u00e1vanie oleja do lo\u017e\u00edsk centr\u00e1lneho kolesa, ktor\u00e9 sa nach\u00e1dzaj\u00fa v strede rotuj\u00facej zostavy a v syst\u00e9me s gravita\u010dn\u00fdm nap\u00e1jan\u00edm dost\u00e1vaj\u00fa minim\u00e1lne rozstrekovanie.<\/p>\n

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\"Hydraulick\u00e1<\/div>\n

Hydraulick\u00e1 prevodovka pohonu \u2013 typick\u00e1 konfigur\u00e1cia zvy\u0161ova\u010da r\u00fdchlosti pou\u017e\u00edvan\u00e1 na pohon \u010derpadla v hydraulick\u00fdch obvodoch poh\u00e1\u0148an\u00fdch v\u00fdvodov\u00fdm hriade\u013eom<\/p>\n<\/div>\n

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Priame porovnanie: Reduktor vs. Zvy\u0161ova\u010d<\/h2>\n

Nasleduj\u00faca tabu\u013eka sumarizuje k\u013e\u00fa\u010dov\u00e9 kon\u0161truk\u010dn\u00e9 a aplika\u010dn\u00e9 rozdiely medzi reduk\u010dn\u00fdm prevodom v\u00fdvodov\u00e9ho hriade\u013ea a prevodovkou so zvy\u0161ova\u010dom ot\u00e1\u010dok v\u00fdvodov\u00e9ho hriade\u013ea. Pou\u017eite ju ako r\u00fdchlu pom\u00f4cku pri v\u00fdbere pri \u0161pecifik\u00e1cii nov\u00e9ho po\u013enohospod\u00e1rska prevodovka<\/a> pre n\u00e1vrh alebo v\u00fdmenu n\u00e1stroja.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nReduktor v\u00fdvodov\u00e9ho hriade\u013ea<\/th>\nZvy\u0161ova\u010d ot\u00e1\u010dok v\u00fdvodov\u00e9ho hriade\u013ea<\/th>\n<\/tr>\n<\/thead>\n
V\u00fdstupn\u00e1 r\u00fdchlos\u0165 vs. vstupn\u00e1 r\u00fdchlos\u0165<\/td>\nNi\u017e\u0161ie (zvy\u010dajne 1\/3 a\u017e 2\/3 ot\u00e1\u010dok v\u00fdvodov\u00e9ho hriade\u013ea)<\/td>\nVy\u0161\u0161ie (zvy\u010dajne 2\u00d7 a\u017e 6\u00d7 ot\u00e1\u010dky v\u00fdvodov\u00e9ho hriade\u013ea)<\/td>\n<\/tr>\n
V\u00fdstupn\u00fd kr\u00fatiaci moment vs. vstupn\u00fd<\/td>\nVy\u0161\u0161ia (vyn\u00e1soben\u00e1 reduk\u010dn\u00fdm pomerom)<\/td>\nDoln\u00e9 \u010d\u00edslo (delen\u00e9 multiplika\u010dn\u00fdm pomerom)<\/td>\n<\/tr>\n
Typick\u00e1 konfigur\u00e1cia prevodov\u00e9ho stup\u0148a<\/td>\n\u0160pir\u00e1lov\u00e9 skosenie (pravouhl\u00e9) alebo \u0161pir\u00e1lovit\u00e9 rovnobe\u017en\u00e9<\/td>\n\u0160pir\u00e1lovit\u00fd paraleln\u00fd, ostr\u00fd paraleln\u00fd alebo plan\u00e9tov\u00fd<\/td>\n<\/tr>\n
Be\u017en\u00fd rozsah pomerov<\/td>\n1,2:1 a\u017e 3,5:1<\/td>\n1:2 a\u017e 1:6<\/td>\n<\/tr>\n
Kritick\u00e9 lo\u017eisko<\/td>\nV\u00fdstupn\u00fd hriade\u013e (vysok\u00fd kr\u00fatiaci moment, ni\u017e\u0161ie ot\u00e1\u010dky)<\/td>\nV\u00fdstupn\u00fd hriade\u013e (vysok\u00e1 r\u00fdchlos\u0165, radi\u00e1lne za\u0165a\u017eenie \u010derpadla)<\/td>\n<\/tr>\n
Prim\u00e1rny re\u017eim poruchy<\/td>\nJamkovanie zubov ozuben\u00e9ho kolesa v d\u00f4sledku r\u00e1zov\u00e9ho pre\u0165a\u017eenia<\/td>\n\u00danava v\u00fdstupn\u00e9ho lo\u017eiska z trvalo vysokej r\u00fdchlosti<\/td>\n<\/tr>\n
Mechanick\u00e1 \u00fa\u010dinnos\u0165<\/td>\n94%\u201397% (\u0161pir\u00e1lov\u00e9 skosenie, jednostup\u0148ov\u00e9)<\/td>\n90%\u201397% (l\u00ed\u0161i sa pod\u013ea typu a prevodov\u00e9ho pomeru)<\/td>\n<\/tr>\n
V\u00fdzva s mazan\u00edm<\/td>\nZabezpe\u010denie EP ochrany pri r\u00e1zovom za\u0165a\u017een\u00ed<\/td>\nRiadenie tepla z vysokor\u00fdchlostn\u00e9ho v\u00edrenia<\/td>\n<\/tr>\n
Typick\u00e9 aplik\u00e1cie<\/td>\nRota\u010dn\u00e9 reza\u010dky, kultiv\u00e1tory, lisy, kosa\u010dky, rozmetadl\u00e1<\/td>\nPohony hydraulick\u00fdch \u010derpadiel, gener\u00e1tory, odstrediv\u00e9 d\u00fachadl\u00e1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Prisp\u00f4sobenie aplik\u00e1cie: Ktor\u00e1 prevodovka pre ktor\u00e9 n\u00e1radie?<\/h2>\n

V\u00fdber medzi zr\u00fdch\u013eova\u010dom ot\u00e1\u010dok a reduk\u010dn\u00fdm prevodom za\u010d\u00edna jednou ot\u00e1zkou: potrebuje n\u00e1radie, aby sa v\u00fdstupn\u00fd hriade\u013e ot\u00e1\u010dal pomal\u0161ie alebo r\u00fdchlej\u0161ie ako v\u00fdvodov\u00fd hriade\u013e? Odpove\u010f je takmer v\u017edy zrejm\u00e1, akon\u00e1hle pochop\u00edte, \u010do vy\u017eaduje pracovn\u00fd mechanizmus n\u00e1radia.<\/p>\n

\"Typ<\/p>\n

Pracovn\u00e9 n\u00e1radie do zeme \u2192 Reduktor<\/h3>\n

Ak\u00e9ko\u013evek n\u00e1radie, ktor\u00e9ho pracovn\u00fd prvok sa dot\u00fdka zeme, plodiny alebo odpadu, potrebuje vysok\u00fd kr\u00fatiaci moment na prekonanie odporu. Rota\u010dn\u00e9 kosa\u010dky ot\u00e1\u010daj\u00face sa vysokou tr\u00e1vou a strom\u010dekmi, rota\u010dn\u00e9 kultiv\u00e1tory prer\u00e1\u017eaj\u00face zhutnen\u00fa p\u00f4du, cepov\u00e9 kosa\u010dky drviace drevnat\u00e9 rastliny a r\u00fdpadl\u00e1 v\u0155taj\u00face do hliny \u2013 v\u0161etky tieto zariadenia sa stret\u00e1vaj\u00fa s n\u00e1hlymi v\u00fdkyvmi odporu, ktor\u00e9 by zastavili vysokor\u00fdchlostn\u00fd v\u00fdstup s n\u00edzkym kr\u00fatiacim momentom. Reduktor absorbuje tieto n\u00e1razy t\u00fdm, \u017ee poskytuje rezervu kr\u00fatiaceho momentu: n\u00e1sobenie prevodov zabezpe\u010duje, \u017ee aj ke\u010f n\u00e1radie naraz\u00ed na odpor v\u00fdrazne prevy\u0161uj\u00faci jeho ust\u00e1len\u00e9 za\u0165a\u017eenie, v\u00fdvodov\u00fd hriade\u013e a motor maj\u00fa prostredn\u00edctvom prevodovky dostato\u010dn\u00fa mechanick\u00fa v\u00fdhodu na to, aby udr\u017eali v\u00fdstupn\u00fd hriade\u013e v ot\u00e1\u010dan\u00ed.<\/p>\n

V r\u00e1mci kateg\u00f3rie reduk\u010dn\u00fdch prevodov mus\u00ed \u0161pecifick\u00fd prevodov\u00fd pomer zodpoveda\u0165 po\u017eiadavk\u00e1m zariadenia. A prevodovka rota\u010dnej fr\u00e9zy<\/a> zvy\u010dajne pou\u017e\u00edva prevodov\u00e9 pomery medzi 1,47:1 a 1,92:1, \u010do z v\u00fdvodov\u00e9ho hriade\u013ea s ot\u00e1\u010dkami 540 ot.\/min. dosahuje v\u00fdstupn\u00e9 ot\u00e1\u010dky 280 a\u017e 367 ot.\/min. Prevodovka lisu na okr\u00fahle bal\u00edky m\u00f4\u017ee pou\u017e\u00edva\u0165 vy\u0161\u0161iu redukciu (2,5:1 a\u017e 3:1), preto\u017ee mechanizmus na formovanie bal\u00edkov potrebuje ve\u013emi vysok\u00fd kr\u00fatiaci moment na stla\u010denie plodiny do tesn\u00e9ho valcov\u00e9ho obalu. Prevodovka rota\u010dn\u00e9ho kultiv\u00e1tora pou\u017e\u00edva miernu redukciu (zvy\u010dajne 1,6:1 a\u017e 2,5:1), ktor\u00e1 vyva\u017euje r\u00fdchlos\u0165 hrotu \u010depele pre efekt\u00edvne rezanie p\u00f4dy s dostato\u010dn\u00fdm kr\u00fatiacim momentom na zvl\u00e1dnutie kore\u0148ovej hmoty a kamenistej p\u00f4dy.<\/p>\n

Pohony \u010derpadiel a gener\u00e1torov \u2192 Zvy\u0161ova\u010d r\u00fdchlosti<\/h3>\n

Hydraulick\u00e9 \u010derpadl\u00e1, odstrediv\u00e9 vodn\u00e9 \u010derpadl\u00e1, vzduchov\u00e9 kompresory a gener\u00e1tory poh\u00e1\u0148an\u00e9 v\u00fdvodov\u00fdm hriade\u013eom maj\u00fa spolo\u010dn\u00fa vlastnos\u0165: ich vn\u00fatorn\u00e9 komponenty s\u00fa navrhnut\u00e9 pre ot\u00e1\u010dky v\u00fdrazne vy\u0161\u0161ie ako v\u00fdkon v\u00fdvodov\u00e9ho hriade\u013ea traktora. Ozuben\u00e9 hydraulick\u00e9 \u010derpadlo vytv\u00e1ra pri 540 ot.\/min. zanedbate\u013en\u00fd prietok \u2013 vn\u00fatorn\u00e9 v\u00f4le, ktor\u00e9 zabezpe\u010duj\u00fa dostato\u010dn\u00e9 utesnenie pri 2 000 ot.\/min., sa pri 540 ot.\/min. \u00famerne zv\u00e4\u010d\u0161uj\u00fa, \u010do umo\u017e\u0148uje v\u00e4\u010d\u0161ine vytla\u010denej kvapaliny unika\u0165 sp\u00e4\u0165 cez konce ozuben\u00fdch kolies. Prev\u00e1dzka toho ist\u00e9ho \u010derpadla pri jeho kon\u0161truk\u010dn\u00fdch ot\u00e1\u010dkach viac ako 2 000 ot.\/min. pomocou zvy\u0161ova\u010da ot\u00e1\u010dok eliminuje t\u00fato stratu \u00fa\u010dinnosti a vytv\u00e1ra menovit\u00fd prietok.<\/p>\n

Gener\u00e1tory poh\u00e1\u0148an\u00e9 v\u00fdvodov\u00fdm hriade\u013eom predstavuj\u00fa \u0161peci\u00e1lny pr\u00edpad, kde v\u00fdstupn\u00e1 r\u00fdchlos\u0165 mus\u00ed zodpoveda\u0165 pevnej elektrickej frekvencii. Na trhoch s frekvenciou 50 Hz (v\u00e4\u010d\u0161ina \u00c1zie, Eur\u00f3py, Oce\u00e1nie) sa mus\u00ed gener\u00e1tor ot\u00e1\u010da\u0165 presne 1 500 ot.\/min. (pre 4-p\u00f3lov\u00fd altern\u00e1tor) alebo 3 000 ot.\/min. (pre 2-p\u00f3lov\u00fd altern\u00e1tor). V\u00fdvodov\u00fd hriade\u013e s 540 ot.\/min. poh\u00e1\u0148aj\u00faci prevodn\u00edk s pomerom ot\u00e1\u010dok 1:2,78 produkuje presne 1 500 ot.\/min. \u2013 ale ak\u00e1ko\u013evek zmena ot\u00e1\u010dok v\u00fdvodov\u00e9ho hriade\u013ea sa priamo prejavuje na frekvencii gener\u00e1tora, \u010do sp\u00f4sobuje kol\u00edsanie nap\u00e4tia. Kvalita prevodn\u00edka s pomerom ot\u00e1\u010dok priamo ovplyv\u0148uje stabilitu elektrick\u00e9ho v\u00fdstupu v t\u00fdchto aplik\u00e1ci\u00e1ch: nerovnosti v z\u00e1bere ozuben\u00fdch kolies, h\u00e1dzanie lo\u017e\u00edsk a vibr\u00e1cie krytu prispievaj\u00fa k pulz\u00e1cii r\u00fdchlosti, ktor\u00e1 sa men\u00ed na frekven\u010dn\u00e9 chvenie v elektrickom v\u00fdstupe.<\/p>\n

\n
\n

\ud83d\udd3d<\/p>\n

Aplik\u00e1cie reduktorov<\/p>\n

Rota\u010dn\u00e9 reza\u010dky, cepov\u00e9 kosa\u010dky, rota\u010dn\u00e9 kultiv\u00e1tory, lisy na okr\u00fahle bal\u00edky, rozmetadl\u00e1 hnoj\u00edv, rozmetadl\u00e1 hnoja, ryha\u010de hnoja, snehov\u00e9 fr\u00e9zy, mie\u0161a\u010dky krmiva, rota\u010dn\u00e9 hrable<\/p>\n<\/div>\n

\n

\ud83d\udd3c<\/p>\n

Aplik\u00e1cie na zv\u00fd\u0161enie<\/p>\n

Pohony hydraulick\u00fdch \u010derpadiel, gener\u00e1tory s v\u00fdvodov\u00fdm hriade\u013eom, odstrediv\u00e9 vodn\u00e9 \u010derpadl\u00e1, vzduchov\u00e9 kompresory, odstrediv\u00e9 d\u00fachadl\u00e1, ventil\u00e1tory na sanie obilia, pohony altern\u00e1torov<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Pr\u00edklady v\u00fdpo\u010dtov s pr\u00e1cou<\/h2>\n

Pr\u00edklad 1: V\u00fdber reduk\u010dn\u00e9ho prevodu pre rota\u010dn\u00fa fr\u00e9zu<\/h3>\n

Rota\u010dn\u00e1 reza\u010dka s priemerom 72 palcov vy\u017eaduje r\u00fdchlos\u0165 hrotu \u010depele pribli\u017ene 68 m\/s na efekt\u00edvne kosenie zmie\u0161an\u00e9ho krovia s priemerom do 3 palcov. \u010cepe\u013e meria od \u010dapu k hrotu 27 palcov (0,686 m). R\u00fdchlos\u0165 hrotu sa rovn\u00e1 \u03c0 \u00d7 priemer rotora \u00d7 ot\u00e1\u010dky za min\u00fatu \u00f7 60. Pri pohybe vzad: 68 = \u03c0 \u00d7 (0,686 \u00d7 2) \u00d7 ot\u00e1\u010dky za min\u00fatu \u00f7 60, tak\u017ee ot\u00e1\u010dky za min\u00fatu = 68 \u00d7 60 \u00f7 (\u03c0 \u00d7 1,372) = 947 ot\u00e1\u010dok za min\u00fatu. Toto je r\u00fdchlos\u0165 rotora potrebn\u00e1 na \u0161pi\u010dk\u00e1ch \u010depele. Ke\u010f\u017ee v\u00fdstupn\u00fd hriade\u013e prevodovky je spojen\u00fd s nosi\u010dom \u010depele priamym pohonom (bez medzi\u013eahl\u00e9ho reme\u0148a alebo re\u0165aze), v\u00fdstupn\u00fd hriade\u013e prevodovky sa mus\u00ed ot\u00e1\u010da\u0165 r\u00fdchlos\u0165ou pribli\u017ene 947 ot\u00e1\u010dok za min\u00fatu.<\/p>\n

Po\u010dkajte \u2013 947 ot.\/min. je viac ako 540 ot.\/min. v\u00fdvodov\u00e9ho hriade\u013ea. Znamen\u00e1 to, \u017ee potrebujete zvy\u0161ova\u010d ot\u00e1\u010dok? Nie. Na v\u00e4\u010d\u0161ine rota\u010dn\u00fdch reza\u010diek je priemer nosi\u010da no\u017ea ove\u013ea men\u0161\u00ed ako dosah no\u017ea od \u010dapu k hrotu. Nosi\u010d no\u017ea (rotuj\u00faci kot\u00fa\u010d) m\u00e1 priemer pribli\u017ene 26 palcov; rozmer 27 palcov je vlastn\u00e1 d\u013a\u017eka no\u017ea od jeho oto\u010dn\u00e9ho \u010dapu k hrotu. R\u00fdchlos\u0165 ot\u00e1\u010dania nosi\u010da no\u017ea, poh\u00e1\u0148an\u00e1 v\u00fdstupom z prevodovky, je typicky 300 a\u017e 400 ot.\/min. Vysok\u00e1 r\u00fdchlos\u0165 hrotu no\u017ea poch\u00e1dza z dlh\u00e9ho ramena no\u017ea, nie z vysok\u00fdch ot\u00e1\u010dok hriade\u013ea. Spr\u00e1vna prevodovka je teda skuto\u010dne reduktor: vstupn\u00fd pomer 540 ot.\/min. \u00f7 1,5:1 = v\u00fdstupn\u00fd pomer 360 ot.\/min., \u010do v kombin\u00e1cii s geometriou no\u017ea vytv\u00e1ra po\u017eadovan\u00fa r\u00fdchlos\u0165 hrotu no\u017ea. Tento pr\u00edklad ilustruje, pre\u010do je pochopenie mechanick\u00e9ho usporiadania n\u00e1stroja \u2013 nielen jeho po\u017eiadaviek na r\u00fdchlos\u0165 \u2013 nevyhnutn\u00e9 pre v\u00fdber spr\u00e1vneho typu prevodovky.<\/p>\n

Pr\u00edklad 2: V\u00fdber zr\u00fdch\u013eova\u010da ot\u00e1\u010dok pre hydraulick\u00e9 \u010derpadlo<\/h3>\n

\u0160tiepa\u010dka dreva poh\u00e1\u0148an\u00e1 v\u00fdvodov\u00fdm hriade\u013eom pou\u017e\u00edva zubov\u00e9 \u010derpadlo s objemom 16 cm3\/ot. s menovit\u00fdmi ot\u00e1\u010dkami 2 200 ot.\/min., pracuj\u00face pri tlaku 180 barov a s poistn\u00fdm ventilom nastaven\u00fdm na 210 barov. Traktor m\u00e1 v\u00fdvodov\u00fd hriade\u013e s ot\u00e1\u010dkami 540 ot.\/min. a v\u00fdkonom 35 HP (26,1 kW). Po\u017eadovan\u00fd prevodov\u00fd pomer: 2 200 \u00f7 540 = zv\u00fd\u0161enie o 4,07:1. Vyberte najbli\u017e\u0161\u00ed komer\u010dn\u00fd prevodov\u00fd pomer nad t\u00fdmto: 1:4,5, ktor\u00fd produkuje 540 \u00d7 4,5 = 2 430 ot.\/min. \u2013 v r\u00e1mci menovit\u00e9ho rozsahu ot\u00e1\u010dok \u010derpadla, ale nepresahuje jeho maxim\u00e1lne povolen\u00e9 ot\u00e1\u010dky (zvy\u010dajne o 10% a\u017e 15% vy\u0161\u0161ie ako menovit\u00e9).<\/p>\n

Teoretick\u00fd prietok: 16 cm3\/ot. \u00d7 2 430 ot.\/min. \u00f7 1 000 = 38,9 l\/min. Pou\u017eite objemov\u00fa \u00fa\u010dinnos\u0165 92%: skuto\u010dn\u00fd prietok 35,8 l\/min. Hydraulick\u00fd v\u00fdkon pri od\u013eah\u010den\u00ed: 35,8 \u00d7 210 \u00f7 600 = 12,5 kW. Pripo\u010d\u00edtajte straty v prevodovke (5% pre \u0161pir\u00e1lov\u00fd zvy\u0161ova\u010d r\u00fdchlosti): 12,5 \u00f7 0,95 = 13,2 kW odberu v\u00fdvodov\u00e9ho hriade\u013ea. To je 13,2 \u00f7 26,1 = 50,6% dostupn\u00e9ho v\u00fdkonu v\u00fdvodov\u00e9ho hriade\u013ea \u2013 \u010do je v r\u00e1mci bezpe\u010dn\u00e9ho prev\u00e1dzkov\u00e9ho rozsahu, pri\u010dom zost\u00e1va dostato\u010dn\u00e1 rezerva pre prechodn\u00e9 pre\u0165a\u017eenia, ke\u010f \u0161tiepac\u00ed klin naraz\u00ed na uzol alebo prie\u010dny odpor vl\u00e1kien.<\/p>\n

\"Zostava<\/div>\n

<\/p>\n

P\u00e4\u0165 be\u017en\u00fdch ch\u00fdb pri v\u00fdbere a ako sa im vyhn\u00fa\u0165<\/h2>\n

Po dvoch desa\u0165ro\u010diach \u0161pecifik\u00e1cie prevodoviek PTO pre po\u013enohospod\u00e1rske a priemyseln\u00e9 aplik\u00e1cie sa ur\u010dit\u00e9 chyby opakuj\u00fa. Ka\u017ed\u00e1 z nich vedie k pred\u010dasn\u00e9mu zlyhaniu, slab\u00e9mu v\u00fdkonu alebo zbyto\u010dn\u00fdm n\u00e1kladom.<\/p>\n

Chyba 1: V\u00fdber prevodovky iba pod\u013ea v\u00fdkonu.<\/strong> V\u00fdkon je s\u00fa\u010dinom kr\u00fatiaceho momentu a ot\u00e1\u010dok. Prevodovka \u201es v\u00fdkonom 50 HP\u201c pri prevodovom pomere 1:3 zvl\u00e1da \u00faplne in\u00fd kr\u00fatiaci moment ako rovnak\u00e1 prevodovka s prevodov\u00fdm pomerom 1:1,5 \u2013 kr\u00fatiaci moment na v\u00fdstupnom hriadeli sa zdvojn\u00e1sob\u00ed, ke\u010f zdvojn\u00e1sob\u00edte reduk\u010dn\u00fd pomer pri rovnakom v\u00fdkone HP. V\u017edy si overte menovit\u00fd kr\u00fatiaci moment pri konkr\u00e9tnom prevodovom pomere, ktor\u00fd chcete pou\u017ei\u0165, nie maxim\u00e1lny v\u00fdkon v konsk\u00fdch sil\u00e1ch na typovom \u0161t\u00edtku.<\/p>\n

Chyba 2: Pou\u017eitie v\u00fdvodov\u00e9ho hriade\u013ea s 540 ot.\/min. s prevodovkou s vysok\u00fdm prevodov\u00fdm pomerom, ke\u010f je k dispoz\u00edcii v\u00fdvodov\u00fd hriade\u013e s 1 000 ot.\/min.<\/strong> Ako bolo uveden\u00e9 v na\u0161om \u010dl\u00e1nku o V\u00fdvodov\u00fd hriade\u013e<\/a> V konfigur\u00e1ci\u00e1ch pren\u00e1\u0161a v\u00fdvodov\u00fd hriade\u013e s 540 ot.\/min. dvojn\u00e1sobn\u00fd kr\u00fatiaci moment oproti v\u00fdvodov\u00e9mu hriade\u013eu s 1 000 ot.\/min. pri rovnakej \u00farovni v\u00fdkonu. Zvy\u0161ova\u010d ot\u00e1\u010dok s vysok\u00fdm prevodov\u00fdm pomerom na v\u00fdvodovom hriadeli s 540 ot.\/min. s\u00fastre\u010fuje extr\u00e9mny kr\u00fatiaci moment na vstupn\u00e9 dr\u00e1\u017ekovanie a zuby prv\u00e9ho stup\u0148a. Prepnut\u00edm na v\u00fdvodov\u00fd hriade\u013e s 1 000 ot.\/min. a ni\u017e\u0161\u00edm prevodov\u00fdm pomerom sa dosiahne rovnak\u00e1 v\u00fdstupn\u00e1 r\u00fdchlos\u0165 pri polovici vstupn\u00e9ho kr\u00fatiaceho momentu, \u010d\u00edm sa predl\u017euje \u017eivotnos\u0165 v\u0161etk\u00fdch komponentov hnacieho \u00fastrojenstva.<\/p>\n

Chyba 3: Ignorovanie pracovn\u00e9ho cyklu.<\/strong> Prevodovka s v\u00fdkonom \u201e50 HP preru\u0161ovan\u00fd\u201c nedok\u00e1\u017ee udr\u017ea\u0165 v\u00fdkon 50 HP nepretr\u017eite 8 hod\u00edn. Po\u013enohospod\u00e1rske reduktory poh\u00e1\u0148aj\u00face rota\u010dn\u00e9 fr\u00e9zy pracuj\u00fa v prirodzenom preru\u0161ovanom cykle \u2013 vysok\u00e9 za\u0165a\u017eenie po\u010das rezania, takmer nulov\u00e9 za\u0165a\u017eenie po\u010das ot\u00e1\u010dania. Zvy\u0161ova\u010de r\u00fdchlosti poh\u00e1\u0148aj\u00face hydraulick\u00e9 \u010derpadl\u00e1 pracuj\u00fa nepretr\u017eite pri takmer menovitom za\u0165a\u017een\u00ed. Uistite sa, \u017ee menovit\u00fd v\u00fdkon prevodovky zodpoved\u00e1 pracovn\u00e9mu cyklu aplik\u00e1cie: preru\u0161ovan\u00fd (S3), kr\u00e1tkodob\u00fd (S2) alebo nepretr\u017eit\u00fd (S1).<\/p>\n

Chyba 4: Zanedbanie radi\u00e1lneho za\u0165a\u017eenia z upevnenia \u010derpadla.<\/strong> Ke\u010f \u0165a\u017ek\u00e9 hydraulick\u00e9 \u010derpadlo vis\u00ed z v\u00fdstupnej pr\u00edruby prevodovky, hmotnos\u0165 \u010derpadla vytv\u00e1ra statick\u00e9 radi\u00e1lne za\u0165a\u017eenie na v\u00fdstupnom lo\u017eisku \u2013 okrem dynamick\u00e9ho radi\u00e1lneho za\u0165a\u017eenia z vn\u00fatorn\u00fdch tlakov\u00fdch s\u00edl \u010derpadla. Katal\u00f3gy prevodoviek, ktor\u00e9 uv\u00e1dzaj\u00fa iba menovit\u00e9 kr\u00fatiace momenty, nemusia zoh\u013ead\u0148ova\u0165 toto kombinovan\u00e9 radi\u00e1lne za\u0165a\u017eenie. Uve\u010fte jednotku s v\u00fdstupn\u00fdmi lo\u017eiskami dimenzovan\u00fdmi na vypo\u010d\u00edtan\u00fd kr\u00fatiaci moment aj kombinovan\u00e9 radi\u00e1lne za\u0165a\u017eenia z hmotnosti \u010derpadla a hydraulick\u00fdch reak\u010dn\u00fdch s\u00edl.<\/p>\n

Chyba \u010d. 5: Predimenzovanie \u201elen pre istotu\u201c.<\/strong> Nadmerne dimenzovan\u00fd reduk\u010dn\u00fd prevod sa jav\u00ed ako konzervat\u00edvna vo\u013eba, ale vytv\u00e1ra si vlastn\u00e9 probl\u00e9my. Prevodovka be\u017eiaca na 20% svojej menovitej kapacity generuje tak m\u00e1lo vn\u00fatorn\u00e9ho tepla, \u017ee vlhkos\u0165 z kondenz\u00e1cie sa z oleja nikdy neodpar\u00ed \u2013 prevodovka pracuje neust\u00e1le v stave \u201estuden\u00e9ho nam\u00e1\u010dania\u201c, ktor\u00fd podporuje vn\u00fatorn\u00fa kor\u00f3ziu, najm\u00e4 na presne br\u00fasen\u00fdch povrchoch zubov ozuben\u00fdch kolies. Probl\u00e9m s kondenz\u00e1ciou je najhor\u0161\u00ed v podneb\u00ed s vysokou vlhkos\u0165ou a ve\u013ek\u00fdmi v\u00fdkyvmi tepl\u00f4t medzi d\u0148om a nocou. Spr\u00e1vne dimenzovan\u00e1 prevodovka, ktor\u00e1 pracuje na 50% a\u017e 75% svojej nepretr\u017eitej menovitej kapacity, sa dostato\u010dne zahrieva na to, aby odviedla kondenz\u00e1ciu a z\u00e1rove\u0148 si zachovala pohodln\u00fa bezpe\u010dnostn\u00fa rezervu pre \u0161pi\u010dkov\u00e9 za\u0165a\u017eenie.<\/p>\n

<\/p>\n

Kombinovan\u00e9 jednotky: Prevodovky s oboma funkciami<\/h2>\n

Niektor\u00e9 po\u013enohospod\u00e1rske n\u00e1stroje potrebuj\u00fa v r\u00e1mci toho ist\u00e9ho stroja zn\u00ed\u017eenie aj zv\u00fd\u0161enie r\u00fdchlosti. Napr\u00edklad samohybn\u00fd zberac\u00ed stroj na reza\u010dku pou\u017e\u00edva reduk\u010dn\u00fd prevod na pohon rezacej hlavy pri vysokom kr\u00fatiacom momente a n\u00edzkej r\u00fdchlosti a z\u00e1rove\u0148 pou\u017e\u00edva zvy\u0161ova\u010d r\u00fdchlosti na pohon hydraulick\u00e9ho \u010derpadla, ktor\u00e9 poh\u00e1\u0148a obvody pod\u00e1vacieho valca a ot\u00e1\u010dania v\u00fdpustu. Namiesto mont\u00e1\u017ee dvoch samostatn\u00fdch prevodoviek niektor\u00ed v\u00fdrobcovia origin\u00e1lnych dielov (OEM) \u0161pecifikuj\u00fa kombinovan\u00fa jednotku \u2013 jednu skri\u0148u s viacer\u00fdmi v\u00fdstupn\u00fdmi hriade\u013emi pracuj\u00facimi s r\u00f4znymi prevodov\u00fdmi pomermi zo spolo\u010dn\u00e9ho vstupu.<\/p>\n

Tieto kombinovan\u00e9 jednotky s\u00fa zlo\u017eitej\u0161ie na v\u00fdrobu, ale pon\u00fakaj\u00fa v\u00fdznamn\u00e9 v\u00fdhody v presnosti zarovnania (v\u0161etky hriadele s\u00fa umiestnen\u00e9 pomocou rovnak\u00e9ho odliatku) a kompaktnosti (\u017eiadne extern\u00e9 konzoly alebo spojky medzi samostatn\u00fdmi prevodovkami). Prevodovka v\u00fdvodov\u00e9ho hriade\u013ea Ever-Power<\/a> In\u017einiersky t\u00edm pravidelne navrhuje kombinovan\u00e9 jednotky na mieru pre z\u00e1kazn\u00edkov OEM, ktor\u00ed potrebuj\u00fa obe funkcie v jednom, priestorovo efekt\u00edvnom balen\u00ed \u2014 kontaktujte n\u00e1s<\/a> prediskutova\u0165 po\u017eiadavky na va\u0161u \u017eiados\u0165.<\/p>\n

Pri posudzovan\u00ed, \u010di je kombinovan\u00e1 jednotka vhodn\u00e1 pre va\u0161u aplik\u00e1ciu, zv\u00e1\u017ete tepeln\u00fa interakciu medzi dvoma v\u00fdstupn\u00fdmi cestami. Cesta reduktora s vysok\u00fdm kr\u00fatiacim momentom a n\u00edzkou r\u00fdchlos\u0165ou generuje teplo predov\u0161etk\u00fdm z trenia v z\u00e1bere ozuben\u00fdch kolies, zatia\u013e \u010do cesta zvy\u0161ova\u010da r\u00fdchlosti generuje teplo z v\u00edrenia a trenia v lo\u017eisk\u00e1ch. Oba zdroje tepla ohrievaj\u00fa spolo\u010dn\u00fd objem oleja. Ak kombinovan\u00e9 generovanie tepla prekro\u010d\u00ed kapacitu rozptylu telesa, spolo\u010dn\u00fd olej sa prehrieva \u2013 \u010do m\u00f4\u017ee vies\u0165 k zn\u00ed\u017eeniu v\u00fdkonu oboch v\u00fdstupn\u00fdch tr\u00e1s s\u00fa\u010dasne. Spr\u00e1vna tepeln\u00e1 anal\u00fdza po\u010das f\u00e1zy n\u00e1vrhu zabezpe\u010d\u00ed, \u017ee plocha telesa a objem oleja kombinovanej jednotky dok\u00e1\u017eu zvl\u00e1dnu\u0165 celkov\u00e9 tepeln\u00e9 za\u0165a\u017eenie za v\u0161etk\u00fdch prev\u00e1dzkov\u00fdch podmienok.<\/p>\n

\n
\"Preh\u013ead<\/div>\n

Preh\u013ead typov prevodoviek PTO \u2013 reduktory a zvy\u0161ova\u010de r\u00fdchlosti sl\u00fa\u017eia z\u00e1sadne odli\u0161n\u00fdm aplika\u010dn\u00fdm po\u017eiadavk\u00e1m<\/p>\n<\/div>\n

<\/p>\n

\u010casto kladen\u00e9 ot\u00e1zky<\/h2>\n
\n
\nM\u00f4\u017ee jedna prevodovka fungova\u0165 ako zvy\u0161ova\u010d r\u00fdchlosti aj ako reduk\u010dn\u00fd prevod?
\n+<\/span><\/summary>\n
\n

Nie obr\u00e1ten\u00edm pripojen\u00ed. Zatia\u013e \u010do ozuben\u00e9 koles\u00e1 m\u00f4\u017eu fyzicky pren\u00e1\u0161a\u0165 v\u00fdkon v oboch smeroch, lo\u017eisk\u00e1, tesnenia a mazac\u00ed syst\u00e9m s\u00fa optimalizovan\u00e9 pre jeden prev\u00e1dzkov\u00fd re\u017eim. V\u00fdstupn\u00e9 lo\u017eisk\u00e1 reduk\u010dn\u00e9ho prevodu s\u00fa vybran\u00e9 pre vysok\u00fd kr\u00fatiaci moment a n\u00edzke ot\u00e1\u010dky; ich prev\u00e1dzka pri zv\u00fd\u0161en\u00fdch ot\u00e1\u010dkach v obr\u00e1tenej konfigur\u00e1cii sp\u00f4sobuje pred\u010dasn\u00fa \u00fanavu materi\u00e1lu. Pre aplik\u00e1cie, ktor\u00e9 vy\u017eaduj\u00fa obe funkcie, existuj\u00fa kombinovan\u00e9 jednotky so samostatn\u00fdmi v\u00fdstupn\u00fdmi cestami, ale s\u00fa \u00fa\u010delovo vyroben\u00e9 s vhodn\u00fdmi lo\u017eiskami a tesneniami na ka\u017edom v\u00fdstupnom hriadeli.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

\n
\n\u010co sa stane, ak pripoj\u00edm zvy\u0161ova\u010d r\u00fdchlosti k n\u00e1radiu, ktor\u00e9 potrebuje reduk\u010dn\u00fd prevod?
\n+<\/span><\/summary>\n
\n

Pracovn\u00fd mechanizmus n\u00e1stroja by sa ot\u00e1\u010dal pr\u00edli\u0161 r\u00fdchlo s pr\u00edli\u0161 mal\u00fdm kr\u00fatiacim momentom. Na rota\u010dnej reza\u010dke by nosi\u010d no\u017eov dosiahol nebezpe\u010dn\u00e9 r\u00fdchlosti, ktor\u00e9 by mohli pri pretrhnut\u00ed skrutky vymr\u0161ti\u0165 \u00falomky no\u017eov, pri\u010dom by s\u00fa\u010dasne ch\u00fdbal kr\u00fatiaci moment na prerezanie akejko\u013evek v\u00fdznamnej veget\u00e1cie \u2013 motor by sa zastavil pri prvom hustom poraste. Na kultiv\u00e1tore by no\u017ee rozdrvili iba vrchn\u00fd centimeter p\u00f4dy bez toho, aby mali silu na hlb\u0161ie preniknutie. V oboch pr\u00edpadoch tie\u017e riskujete prekro\u010denie ot\u00e1\u010dok vlastn\u00fdch lo\u017e\u00edsk a hriade\u013ea n\u00e1stroja, ktor\u00e9 s\u00fa navrhnut\u00e9 pre ni\u017e\u0161ie ot\u00e1\u010dky reduktora.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

\n
\nOpotreb\u00favaj\u00fa sa zvy\u0161ova\u010de r\u00fdchlosti r\u00fdchlej\u0161ie ako reduk\u010dn\u00e9 prevody?
\n+<\/span><\/summary>\n
\n

Nie je to inherentne, ale \u010delia r\u00f4znym mechanizmom opotrebovania. Reduktory v po\u013enohospod\u00e1rskych aplik\u00e1ci\u00e1ch trpia predov\u0161etk\u00fdm po\u0161koden\u00edm povrchu zubov sp\u00f4soben\u00fdm r\u00e1zov\u00fdm za\u0165a\u017een\u00edm \u2013 jamkami, odlupovan\u00edm a mikropraskan\u00edm v d\u00f4sledku n\u00e1razov. Zvy\u0161ova\u010de r\u00fdchlosti trpia predov\u0161etk\u00fdm \u00fanavou lo\u017e\u00edsk a opotrebovan\u00edm tesnen\u00ed v d\u00f4sledku vy\u0161\u0161\u00edch ot\u00e1\u010dok v\u00fdstupn\u00e9ho hriade\u013ea. Dobre navrhnut\u00fd zvy\u0161ova\u010d r\u00fdchlosti s vhodn\u00fdmi vysokor\u00fdchlostn\u00fdmi lo\u017eiskami a v\u00fdstupn\u00fdmi tesneniami z PTFE, prev\u00e1dzkovan\u00fd v r\u00e1mci svojich tepeln\u00fdch limitov, m\u00f4\u017ee dosiahnu\u0165 \u017eivotnos\u0165 lo\u017eiska porovnate\u013en\u00fa s reduk\u010dn\u00fdm prevodom prev\u00e1dzkovan\u00fdm v r\u00e1mci svojich limitov r\u00e1zov\u00e9ho za\u0165a\u017eenia. Discipl\u00edna v \u00fadr\u017ebe je d\u00f4le\u017eitej\u0161ia ako typ prevodovky: bu\u010f jednotka pred\u010dasne zlyh\u00e1, ke\u010f sa zanedb\u00e1 v\u00fdmena oleja, alebo sa do telesa dostan\u00fa ne\u010distoty.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

\n
\nAk\u00fd je najefekt\u00edvnej\u0161\u00ed typ prevodov\u00e9ho stup\u0148a pre zvy\u0161ova\u010d ot\u00e1\u010dok v\u00fdvodov\u00e9ho hriade\u013ea?
\n+<\/span><\/summary>\n
\n

\u0160pir\u00e1lov\u00e9 ozuben\u00e9 koles\u00e1 s paraleln\u00fdmi hriade\u013emi poskytuj\u00fa najlep\u0161iu kombin\u00e1ciu \u00fa\u010dinnosti a plynul\u00e9ho chodu pre prevodov\u00e9 pomery a\u017e do pribli\u017ene 1:4. Ka\u017ed\u00fd stupe\u0148 dosahuje \u00fa\u010dinnos\u0165 97% a\u017e 98% a postupn\u00e9 zaberanie zubov minimalizuje torzn\u00e9 vibr\u00e1cie pren\u00e1\u0161an\u00e9 do \u010derpadla. Pri prevodov\u00fdch pomeroch nad 1:4 sa plan\u00e9tov\u00e9 ozuben\u00e9 koles\u00e1 st\u00e1vaj\u00fa \u00fa\u010dinnej\u0161\u00edmi, preto\u017ee rozde\u013euj\u00fa za\u0165a\u017eenie medzi viacero plan\u00e9tov\u00fdch ozuben\u00fdch kolies, \u010d\u00edm zni\u017euj\u00fa sily z\u00e1beru na ktor\u00fdko\u013evek jednotliv\u00fd zub a dosahuj\u00fa \u00fa\u010dinnos\u0165 95% a\u017e 96% v jednom stupni, \u010do by pri ozuben\u00ed s paraleln\u00fdmi hriade\u013emi vy\u017eadovalo dva stupne. \u010celn\u00e9 ozuben\u00e9 koles\u00e1 s\u00fa najlacnej\u0161ie, ale najhlu\u010dnej\u0161ie a najmenej \u00fa\u010dinn\u00e9 kv\u00f4li ich n\u00e1hlemu vzoru z\u00e1beru zubov.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

\n
\nAko vypo\u010d\u00edtam po\u017eadovan\u00fd kr\u00fatiaci moment pre moju prevodovku?
\n+<\/span><\/summary>\n
\n

Pre reduk\u010dn\u00fd prevod: V\u00fdstupn\u00fd kr\u00fatiaci moment (Nm) = (v\u00fdkon v\u00fdvodov\u00e9ho hriade\u013ea vo wattoch \u00f7 v\u00fdstupn\u00e1 r\u00fdchlos\u0165 v rad\/s) \u00d7 reduk\u010dn\u00fd pomer \u00d7 servisn\u00fd faktor. Servisn\u00fd faktor zoh\u013ead\u0148uje r\u00e1zov\u00e9 za\u0165a\u017eenie \u2013 pou\u017eite 1,5 pre rovnomern\u00e9 za\u0165a\u017eenie (gener\u00e1tory), 2,0 pre mierne r\u00e1zy (kultiv\u00e1tory, kosa\u010dky) a 2,5 a\u017e 3,0 pre siln\u00e9 r\u00e1zy (fr\u00e9zy na pne, zariadenia na odstra\u0148ovanie sk\u00e1l). Pre zvy\u0161ova\u010d r\u00fdchlosti: V\u00fdstupn\u00fd kr\u00fatiaci moment = v\u00fdkon v\u00fdvodov\u00e9ho hriade\u013ea \u00f7 v\u00fdstupn\u00e1 r\u00fdchlos\u0165. Ke\u010f\u017ee v\u00fdstupn\u00e1 r\u00fdchlos\u0165 je vy\u0161\u0161ia, v\u00fdstupn\u00fd kr\u00fatiaci moment je ni\u017e\u0161\u00ed, ale mus\u00edte zoh\u013eadni\u0165 aj radi\u00e1lne za\u0165a\u017eenie \u010derpadla na v\u00fdstupn\u00e9 lo\u017eisko \u2013 k vypo\u010d\u00edtan\u00e9mu kr\u00fatiacemu momentu pripo\u010d\u00edtajte 15% k 25%, aby ste pokryli t\u00fato dodato\u010dn\u00fa po\u017eiadavku na lo\u017eisko.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

\n
\nJe mo\u017en\u00e9 prep\u00edna\u0165 medzi 540 a 1 000 ot.\/min na tej istej prevodovke?
\n+<\/span><\/summary>\n
\n

Samotn\u00e1 prevodovka sa nestar\u00e1 o vstupn\u00e9 ot\u00e1\u010dky \u2013 jednoducho pou\u017eije svoj pevn\u00fd prevodov\u00fd pomer. Zvy\u0161ova\u010d ot\u00e1\u010dok 1:3 produkuje 1 620 ot.\/min z v\u00fdvodov\u00e9ho hriade\u013ea s 540 ot.\/min. alebo 3 000 ot.\/min. z v\u00fdvodov\u00e9ho hriade\u013ea s 1 000 ot.\/min. Limituj\u00facim faktorom je fyzick\u00e9 pripojenie: \u010dapy v\u00fdvodov\u00e9ho hriade\u013ea s 540 ot.\/min. pou\u017e\u00edvaj\u00fa 6-dr\u00e1\u017ekov\u00fd hriade\u013e s priemerom 1-3\/8 palca, zatia\u013e \u010do \u010dapy s 1 000 ot.\/min. pou\u017e\u00edvaj\u00fa 21-dr\u00e1\u017ekov\u00fd hriade\u013e s priemerom 1-3\/8 palca. Na prep\u00ednanie medzi ot\u00e1\u010dkami v\u00fdvodov\u00e9ho hriade\u013ea by ste museli vymeni\u0165 adapt\u00e9r vstupn\u00e9ho dr\u00e1\u017ekovania (alebo cel\u00fa zostavu vstupn\u00e9ho hriade\u013ea) a mus\u00edte overi\u0165, \u010di v\u00fdstupn\u00e9 ot\u00e1\u010dky pri nov\u00fdch vstupn\u00fdch ot\u00e1\u010dkach neprekra\u010duj\u00fa maxim\u00e1lne povolen\u00e9 ot\u00e1\u010dky \u010derpadla alebo n\u00e1radia.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

<\/p>\n

\n

Potrebujete pom\u00f4c\u0165 s v\u00fdberom medzi zr\u00fdch\u013eova\u010dom a reduktorom r\u00fdchlosti?<\/h2>\n

Po\u0161lite n\u00e1m podrobnosti o va\u0161ej aplik\u00e1cii \u2013 ot\u00e1\u010dky v\u00fdvodov\u00e9ho hriade\u013ea, typ n\u00e1radia a po\u017eiadavky na v\u00fdkon \u2013 a n\u00e1\u0161 technick\u00fd t\u00edm v\u00e1m odporu\u010d\u00ed presn\u00fd prevodov\u00fd pomer, typ prevodov\u00e9ho stup\u0148a a konfigur\u00e1ciu mont\u00e1\u017ee, ktor\u00e9 zodpovedaj\u00fa v\u00e1\u0161mu syst\u00e9mu. K dispoz\u00edcii je viac ako 500 modelov po\u013enohospod\u00e1rskych prevodoviek na okam\u017eit\u00fa \u0161pecifik\u00e1ciu.<\/p>\n

Kontaktujte na\u0161ich technikov<\/a><\/p>\n<\/div>\n

Redaktor: Cxm<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Zvy\u0161ova\u010d r\u00fdchlosti v\u00fdvodov\u00e9ho hriade\u013ea vs. redukcia prevodov\u00e9ho stup\u0148a: Kedy pou\u017ei\u0165 ktor\u00fdko\u013evek z nich Predstavte si syst\u00e9m prevodov na bicykli: n\u00edzky prevodov\u00fd stupe\u0148 zn\u00e1sobuje silu \u0161liapania pri st\u00fapan\u00ed do kopca na \u00fakor r\u00fdchlosti kolesa, zatia\u013e \u010do vysok\u00fd prevodov\u00fd stupe\u0148 zn\u00e1sobuje r\u00fdchlos\u0165 kolesa na rovn\u00fdch cest\u00e1ch na \u00fakor kr\u00fatiaceho momentu n\u00f4h. Prevodovka v\u00fdvodov\u00e9ho hriade\u013ea rob\u00ed presne to ist\u00e9 \u2013 a [\u2026]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[4042],"tags":[],"class_list":["post-1217","post","type-post","status-publish","format-standard","hentry","category-agricultural-gearbox"],"_links":{"self":[{"href":"https:\/\/pto-gearbox.net\/sk\/wp-json\/wp\/v2\/posts\/1217","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pto-gearbox.net\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pto-gearbox.net\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pto-gearbox.net\/sk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pto-gearbox.net\/sk\/wp-json\/wp\/v2\/comments?post=1217"}],"version-history":[{"count":2,"href":"https:\/\/pto-gearbox.net\/sk\/wp-json\/wp\/v2\/posts\/1217\/revisions"}],"predecessor-version":[{"id":1219,"href":"https:\/\/pto-gearbox.net\/sk\/wp-json\/wp\/v2\/posts\/1217\/revisions\/1219"}],"wp:attachment":[{"href":"https:\/\/pto-gearbox.net\/sk\/wp-json\/wp\/v2\/media?parent=1217"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pto-gearbox.net\/sk\/wp-json\/wp\/v2\/categories?post=1217"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pto-gearbox.net\/sk\/wp-json\/wp\/v2\/tags?post=1217"}],"curies":[{"name":"pracovn\u00fd list","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}