Should the sliding bearing with a spherical tile back and the upper gland of the bearing seat have an interference fit or a clearance fit?
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Today, the 1400kw motor in our factory was overhauled and reassembled. When assembling a bearing, maintenance workers assemble it with a clearance fit. Is it correct to say that it is necessary to ensure that the ball tiles can rotate?
This post was last edited by Shutong on 2020-3-30 00:11. The maintenance worker is not clear about the structure and dimensions of the JBT 5888-2005 DQ series sliding bearings for motors. This standard specifically stipulates the tolerances of sliding bearings for motors and the accuracy requirements for the bearing working surface. 6.1 The tolerance accuracy of the inner diameter of the bearing is based on the GBT 1801-2009 Product Geometric Technical Specification (GPS). The limit and fit tolerance zone and fit selection are specified in H7. 6.2 The surface roughness of the working surface of the bearing inner diameter and the shape and position tolerance of the bearing inner diameter are in accordance with IT6 specified in GB/T 1800.4, and the limit deviation is in accordance with the average relative distance requirements. Anyone who has been engaged in mechanical equipment design for many years knows that: In most cases, the sliding bearing and bearing seat should be H7/k6 or H7/j6, which are transitional fits. Major manufacturers such as Nanyang explosion-proof motors manufacture according to this standard.
This post was last edited by CHANGBAISHI on 2020-3-30 08:28. If it is an interference fit, it seems that it cannot be installed in place:) But the levelness must be ensured. For reference.
Thank you all for your advice. I asked the after-sales staff of Nanyang Motor Factory today. After-sales service said that in theory it should be a transitional fit, but in actual work it is usually adjusted to an interference of 2 to 3 wires.
Generally 0 to 0.02mm tightening force
Sliding bearing assembly requires tightening force
Of course not, the interference cannot be too large, but there cannot be any gaps either.
The bearings we produce are transition fits.