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1、Frequently Asked Questions About Bearings 常碰到的轴承的疑问 Etching surface 酸洗表面 Shoe mark on outer ring surface 外圈支撑痕迹 Bright chamfer 光亮倒角 Discolouration chamfer 变色倒角 Exchangeability of cylindrical roller bearing ring 圆柱滚子轴承的套圈互换性 Full complement cylindrical roller bearing with black oxidizing 表面黑化的满装圆柱滚子轴
2、承 Contents 内容 Etch surface 酸洗表面 Why does visible dull-grey colour on the bearing surface (inner ring or outer ring) sometimes, instead of normal finished coulour? 轴承（内外圈）表面是明显的暗灰色，不是通常加工后的颜色，这是为什么？ Etched ring酸洗后的轴承套圈Not etched ring未酸洗的轴承套圈 Etching is carried out as one method of random quality insp
3、ections during manufacturing process, grinding burn defect due to high temperature can be detected, therefor it ensure better quality with high reliability. 在舍弗勒的生产部门，推行了对轴承部件随机抽查，进行酸洗，检测是否 有高温磨削缺陷。从而获得更可靠，更完美的轴承品质。 The colour of bearing ring after etched is shallow gray or dull gray. 酸洗过的轴承呈现出浅灰色或中
4、灰色。 Etching surface 酸洗表面 Compare to the etched and non etched bearing, there is no difference regarding dimension deviation, geometric tolerance and function. On the contrary, etching process can guarantee product with high quality and reliability. So etched product can be used saftely. 酸洗过的轴承与未酸洗过的
5、光亮的轴承相比，它在尺寸公差，形位公差和 功能上无任何差异。相反，酸洗增加了这些部件的质量保障。因此，酸洗 过的部件可以安全地装配和使用。 Etching surface 酸洗表面 There is shoe mark on the bearing ourter surface sometimes, it seems as seizure mark, does it influence bearing quality? 有的轴承外圈外径表面有些痕迹，似乎是划伤的，是否影响轴承的质量？ Shoe mark on outer ring surface 外圈支撑痕迹 This mark is fro
6、m grinding process. When grinding raceway or bore, as a reference surface, outer surface is running contacting with support shoes forming this mark(as figure), It has no depth, just has visible bright or dull colour on the surface, all the measurements of this area are up to criterion. So it is no i
7、nfluence on useage. 这种支承座的痕迹来自磨削过程中,由于外径是磨削内径或滚道的基准,当磨削滚道 或内径时,外径在支承座上回转,这样就会在外径表面留下一圈印迹,(如图所示) .这 种痕迹没有任何深度,只是颜色看上去上会有些暗或亮。它不影响使用, 支承座的痕 迹中间的所有表面测量数据都是满足质量要求的. Shoe mark on outer ring surface 外圈支撑痕迹 support shoes 支承块 Grinding machine headstock arrangement 磨床床头箱布置 Shoe mark on outer ring surface 外圈支
8、撑痕迹 Etching and shoe mark 酸洗表面及外圈支撑痕 Normally, an instruction sheet is attached in the package for this kind of bearing 一般情况下, 有上述疑问的轴承, 在出厂时会有如下文件附于轴承包装箱内。 Bright chamfer 光亮倒角 Why some chamfers are bright instead of normal dark colour? 为什么有的轴承倒角是光亮的, 而不是通常见到的黑色? Normally, bearing chamfer is black,
9、no further process after heat treatment, but sometimes hard turning is carried out after heat treatment in order to get good visual effect, and this resulted the bright chamfer. 正常情况下, 轴承套圈的倒角是黑色的, 不再进行机加工。有时, 美化外观, 在套圈热 处理后会对其倒角进行硬车, 此时就产生了光亮的倒角。 bright chamfer 光亮倒角 Discolouration chamfer 变色倒角 Some
10、times, the bearing chamfer has non-uniform discolouration, why? 有时会发现轴承倒角颜色不匀, 有色差, 是什么原因? It is a common colour after heat treatment(as figure). The chamfer colour will be uniform if the bearing undergo sand blast process. 图示是热处理后的正常颜色。如果轴承经过喷砂处理, 则倒角的颜色会比较均匀。 discolouration chamfer 变色倒角 Why the de
11、signation is different which is marked on the inner ring and outer ring sideface, especially for suffix? 为何圆柱滚子轴承内圈和外圈上的型号,尤其是后缀不一致？ Exchangeability of cylindrical roller bearing ring 圆柱滚子轴承的套圈互换性 为何圆柱滚子轴承内圈和外圈上的型号,尤其是后缀不一致？ The bearing outer ring can be exchanged among different bearing type, for e
12、xample, NU outer ring is the same with NJ, NUP and NJ+HJ In this case, bearing designation is determined by the mark which is marked on inner ring sideface. This have no influence on bearing quality and applications. 因为些类型轴承的套圈是通选的，例如, NU的外圈可以与NJ、NUP和 NJ+HJ等型号进行互换，但轴承系列号应是匹配的。因此在装配时有时会 发生型号的不一致，应以内圈
13、上的型号为准。这不影响装配后轴承的品质和 使用 。 Exchangeability of cylindrical roller bearing ring 圆柱滚子轴承的套圈互换性 Full complement cylindrical roller bearing with black oxidizing 表面黑化的满装圆柱滚子轴承 Most of full comlement CRB bearing with black colour, any function chnage? why recommend to use this kind of bearing? 舍弗勒的满装圆柱滚子轴承为何
14、多表面涂黑，有无性能变化，为何要推荐这种 类型的轴承？ Full complement cylindrical roller bearing with black oxidizing 表面黑化的满装圆柱滚子轴承 As we know, in wind power gearbox, full complement cylindrical roller bearing is suitable for input shaft due to its high load carry capacity. But slippage will occur if the bearing work on low
15、load situation, this is harmful for bearing application. 我们经过一系列应用分析发现，在风电齿轮箱的应用中，满装圆柱滚子 轴承具有承载能力高等特点，适于低速输入轴，但若遇低载荷时往往会 发生打滑的现象，这对轴承的使用是很不利的。 Full complement cylindrical roller bearing with black oxidizing 表面黑化的满装圆柱滚子轴承 After a lot of investigation and testing, we develop CRB bearing with black oxi
16、dizing( suffix BR), which is valid to avoid slippage, and increase the beairng performance. Black coating can protect bearing from corrosion, reduce wear, meanwhile prevent slippage. We strongly recommend to use this advanced bearing, and for this application, we do not offer full complement CRB bearing without BR suffix from Dec. 2007. 经过这类轴承进行了研究及测试，开发出的表面黑化的满装圆柱滚子轴承(后缀 为BR)，可以有效防止对应工况的打滑现象，因此提高了轴承的整体性能。黑 色的氧化层既可防腐蚀，耐磨损，又可防止打滑。我们
