Regarding the lapping of bearing shells
Thread Content
When installing the newly fitted elliptical shaft bearings, if there is no issue with the clearance, is it necessary to grind the contact surface at the bottom of the lower bearing?
It’s not necessary, unless there are differences in the matching.
Why isn’t it used? Isn’t it necessary to have an oil tank?
It needs to be lapped together with the shaft.
When checking the contact area in conjunction with the shaft and finding it to be below requirements, grinding is necessary.
The lower bearing shell needs to be ground, mainly to ensure proper contact between the shaft diameter and the bottom of the bearing shell.
In the past, old tiles had to be filed, but nowadays tiles don’t need to be filed.
Thin-walled tiles only require oil grooves or gaps, while thick-walled tiles can be lapped according to the number of tiles and the contact area.
Hmm,! The contact surface does not fit well during assembly, so lapping is the only option
What material are the newly installed tiles made of? Babbitt alloy generally does not require scraping or lapping; it consists of hard particles distributed evenly within a soft matrix, and it is this soft matrix that gives babbitt alloy excellent embedding properties, compliance, and resistance to galling.
For older types of tiles such as elliptical tiles, the upper and lower tiles need to be ground; this is necessary both to ensure a proper fit with the shaft diameter and to create oil grooves that help form oil gaps. Modern tiles, which are usually of the five-piece type (used in applications with high speeds), are already manufactured with these features in place, so no grinding is required.