Rolling bearing, spindle support structure of main motor for railway vehicle, and bearing structure

Abstract

A cylindrical roller bearing (41) which comprises an inner ring (42), an outer ring (43) having the same axial width as that of the inner ring (42) and having insulation layers (43a) formed on the outer diameter surface and both end faces thereof, cylindrical rollers (44) disposed between the inner ring (42) and the outer ring (43), a cage (45) keeping intervals between the cylindrical rollers (44), and sealing seals (46) as sealing members of roughly square-C shape in cross section projected from both end faces of the inner ring (42) and the outer ring (43). The length L3 of the rollers (44) and the axial widths W3 of the inner ring (42) and the outer ring (43) are so related as L3 / W3 = 0.4. The bearing volume V3 of the cylindrical roller bearing (41) and the internal space volume C3 of the cylindrical roller bearing (41) are so related as 0.25 <= C3 / V3 <= 0.55.

Description

technical field [0001] The present invention relates to a rolling bearing, and in particular, to a rolling bearing that requires a longer lubrication life in grease lubrication. [0002] The invention relates to a rolling bearing, in particular to a bearing for a main electric motor of a railway vehicle with an insulating layer on the ferrule. Background technique [0003] At present, cylindrical roller bearings, deep groove ball bearings, etc. are used for the bearings of the main motors of railway vehicles. E.g, Figure 17 The cylindrical roller bearing 1 shown includes an inner ring 2, an outer ring 3, cylindrical rollers 4 as rolling elements arranged between the inner ring 2 and the outer ring 3, and a spacer for maintaining the distance between the cylindrical rollers 4. Holder 5. [0004] In addition, in the cylindrical roller bearing 1 used in a main motor for railway vehicles, an insulating layer 3a is formed on the outer diameter surface and both end surfaces of ...

AI Technical Summary

Problems solved by technology

[0011] In the case of cylindrical roller bearings within the above range, the bearing internal space volume C 1 Small, therefore, there is a problem that it is impossible to pack an appropriate amount of grease to ensure the bearing life necessary for the bearings of the main motor of the railway vehicle

However, if the consistency of the lubricating film 127 is high, the holding force will be insufficient, and a large amount of grease 127 will temporarily flow into the rolling bearing. As a result, abnormal heating may be caused as the stirring resistance increases.

[0034] When rolling bearings having these problems are used in the main shaft support structure supporting the main shaft of the main electric motor for railway vehicles, it may not be able to withstand long-term use

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