美國(guó)timken軸承,進(jìn)口軸承,滾珠軸承
滾珠軸承：是滾動(dòng)軸承的一種，將球形合金鋼珠安裝在內(nèi)鋼圈和外鋼圈的中間，以滾動(dòng)方式來(lái)降低動(dòng)力傳遞過(guò)程中的摩擦力和提高機(jī)械動(dòng)力的傳遞效率。滾珠軸承不能承受較大的重載荷，在輕工業(yè)機(jī)械中較常見(jiàn)。滾珠軸承也叫球軸承。 滾珠軸承主要包含四個(gè)基本元件：滾珠（ball）、內(nèi)環(huán)（inner ring）、外環(huán)（outer ring）與保持器（cage or retainer），如圖所示。一般工業(yè)用的滾珠軸承滿足AISI52100的標(biāo)準(zhǔn)，滾珠與環(huán)通常是以高鉻鋼制成，洛氏硬度（Rockwell C- scale hardness）約在61-65之間。而保持器的硬度相較于滾珠與環(huán)低，其材料有金屬（如：中碳鋼、鋁合金）或非金屬（如：鐵弗龍、PTEF、高分子材料）。滾動(dòng)軸承（rolling bearing）比軸頸軸承(journal bearing)的轉(zhuǎn)動(dòng)摩擦阻力小，因此相同的轉(zhuǎn)速下，由于摩擦產(chǎn)生的溫度會(huì)比較低。 　　滾珠軸承一般是用在低載荷機(jī)械傳動(dòng)的設(shè)備中。因?yàn)闈L珠軸承的承載面積小，在高速運(yùn)轉(zhuǎn)的情況下極易出現(xiàn)嚴(yán)重的機(jī)械性損傷，所以在重載荷的機(jī)械傳動(dòng)中往往采取滾針式軸承以加大承載面，提高機(jī)械傳遞效率和降低機(jī)械性損傷。
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