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一般的減速機(jī)有斜齒輪減速機(jī)(包括平行軸斜齒輪減速機(jī)、蝸輪減速機(jī)、錐齒輪減速機(jī)等等)、行星齒輪減速機(jī)、擺線針輪減速機(jī)、蝸輪蝸桿減速機(jī)、行星摩擦式機(jī)械無級(jí)變速機(jī)等等。
當(dāng)電機(jī)和減速機(jī)間裝配時(shí)同心度保證的非常好時(shí)，電機(jī)輸出軸承受的僅僅是轉(zhuǎn)動(dòng)力，運(yùn)轉(zhuǎn)時(shí)也會(huì)很平滑。然而不同心時(shí)，輸出軸要承受來自于減速機(jī)輸入端的徑向力，這個(gè)徑向力長(zhǎng)期作用將會(huì)使電機(jī)輸出軸被迫彎曲，而且彎曲的方向隨著輸出軸轉(zhuǎn)動(dòng)不斷變化。輸出軸每轉(zhuǎn)動(dòng)一周，橫向力的方向變化360度。如果同心度的誤差較大時(shí)，該徑向力使電機(jī)輸出軸溫度升高，其金屬結(jié)構(gòu)不斷被破壞，最后該徑向力將會(huì)超出電機(jī)輸出軸所能承受的徑向力，最后導(dǎo)致驅(qū)動(dòng)電機(jī)輸出軸折斷。
當(dāng)減速機(jī)同心度的誤差越大時(shí)，驅(qū)動(dòng)電機(jī)輸出軸折斷的時(shí)間越短。在驅(qū)動(dòng)電機(jī)輸出軸折斷的同時(shí)，減速機(jī)輸入端同樣也會(huì)承受來自于電機(jī)方面的徑向力，如果這個(gè)徑向力同時(shí)超出了二者所能承受的最大徑向負(fù)荷的話，其結(jié)果也會(huì)導(dǎo)致減速機(jī)輸入端產(chǎn)生變形甚至斷裂。因此，在裝配時(shí)保證同心度至關(guān)重要。

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