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Introduction of rolling bearing assembly method for small and micro bearings

Release time: 2020-08-26 09:54:43 Views: 144

As we all know, in order to ensure the efficient and stable operation of rolling bearings, in addition to the higher requirements for the performance parameters of the bearings, it is also inseparable from the correct bearing assembly method. Any incorrect assembly method will affect the operation effect of the bearing, and even cause damage to the bearing and its supporting equipment. How to assemble rolling bearing correctly? In this issue, we will introduce several common rolling bearing assembly methods in detail.

The assembly of rolling bearing shall be determined according to the structure, size and matching nature of bearing parts. The general assembly methods of rolling bearings include hammering method, pressing method, hot assembling method and cold shrinking method.
1. Preparation before rolling bearing assembly
(1) Prepare the necessary tools and measuring tools according to the bearing to be assembled. According to the requirements of the drawing, check whether the parts matching the bearing have defects, rust and burr.
(2) Clean the parts matching the bearing with gasoline or kerosene, wipe with clean cloth or blow dry with compressed air, and then apply a thin layer of oil.
(3) Check whether the bearing model is consistent with the drawing.
(4) The bearings sealed with antirust oil can be cleaned with gasoline or kerosene; those sealed with thick oil and anti rust grease can be cleaned by heating with light mineral oil, and then cleaned with gasoline or kerosene after cooling, and then wiped and ready for use; for bearings with dust covers and sealing rings on both sides or coated with antirust and lubricating grease, it is not necessary to clean them.


2. Rolling bearing assembly method
(1) Assembly of cylindrical bore bearing
① The assembly sequence of non separable bearings (such as deep groove ball bearing, self-aligning ball bearing, self-aligning roller bearing, angular contact bearing, etc.) shall be determined according to the tightness of the race. When the inner ring fits tightly with the journal and the outer ring fits loosely with the housing, install the bearing on the shaft first, and then install it into the housing together with the shaft. When the outer ring of the bearing is tightly matched with the housing hole, and the inner ring is loose with the journal, the bearing shall be pressed into the shell first; when the inner ring and the shaft, the outer ring and the shell hole are all tightly matched, the bearing shall be pressed on the shaft and the shell hole at the same time.
② Since the inner and outer rings of separated bearing (such as tapered roller bearing, cylindrical roller bearing, needle roller bearing, etc.) can be separated freely, the inner ring and rolling element are installed on the shaft together, and the outer ring is installed in the shell, and then the clearance between them is adjusted. The commonly used assembly methods of bearings are hammering method and pressing method.


If the journal size is large and the interference is large, the hot assembly method can be used for assembly convenience, that is, the bearing is heated in oil with temperature of 80 ~ 100 ~ C, and then it is matched with the shaft at normal temperature. When the bearing is heated, it should be placed on the grid in the oil groove, so as to prevent the bearing from contacting the box bottom which is much higher than the oil temperature, and also to prevent contact with the precipitated dirt at the bottom of the box. For small bearings, they can be hung on the hook and heated in oil. The bearing with dust cover or seal ring filled with lubricating grease inside shall not be assembled by hot assembly method.
(2) When the assembling interference of tapered bore bearing is small, it can be directly installed on the journal with taper, or on the conical surface of tightening sleeve or stripping sleeve; for the tapered bore bearing with large journal size or large interference and often disassembled, the hydraulic sleeve method is usually used.



(3) The assembly of thrust ball bearing can be divided into loose ring and tight ring. During assembly, the tightening ring should be placed on the end face of rotating parts and the loose ring should be close to the end face of static parts, otherwise the rolling element will lose its function and the wear between matching parts will be accelerated.

Finally, after the bearing is installed, it is necessary to check the operation immediately to determine whether the bearing is installed correctly. After confirming that the bearing is installed correctly, it can enter the formal working state.

Well, this issue of small and micro bearings will be shared here for you, hoping to provide you with useful guidance and help in the bearing assembly process. If you want to know more about bearing installation, please call Yuwei company's sales hotline 021-51099639-802 and 24-hour after-sales service hotline 15309279285 (the same as wechat), we will provide you with help and technical service support at any time!

Yuwei bearing, the bearing expert around you.

 Shanghai miniature bearing
Shanghai Yuwei Bearing Co., Ltd. (Headquarters)
Tel: 021-51099639
Fax: 021-51861291
Email address: yw@gifudayo.com
Address: 2758 Songjin Road, Zhangyan Town, Jinshan District, Shanghai, China
Shaanxi Yuwei Bearing Manufacturing Co., Ltd
Tel: 029-86696506
Fax: 029-89503160
Email address: sales@gifudayo.com
Address: Qinhan new town free trade zone, Xixian new area, Shaanxi Province
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