Roller bearing unit

Abstract

The invention provides a roller bearing unit for which the weight can be decreased and the durability can be improved. An outer ring core metal (26) that is manufactured from an iron alloy and forms an outer ring (2a) is molded to an outer ring main body (25) manufactured from a synthetic resin containing reinforced fibers or from an aluminum alloy. At the inner circumferential surface of the outer ring core metal (26), outer ring raceway members (27) are fitted into and affixed to mating concave surfaces (30), which are the portions of the inner circumferential surface of the outer ring core metal (26) that are exposed from the outer ring main body (25). A hub core metal (37) that is manufactured from an iron alloy and forms a hub (3a) is molded to a hub main body (36) manufactured from a synthetic resin containing reinforced fibers or from an aluminum alloy. At the outer circumferential surface of the hub core metal (37), inner ring raceway members (38) are fitted onto and affixed to a mating surface (49), which is the portion of the outer circumferential surface of the hub core metal (37) that is exposed from the hub main body (36).

Description

technical field [0001] The present invention relates to a rolling bearing unit used in a hub unit for supporting a wheel for supporting an automobile wheel on a suspension device. Background technique [0002] In order to rotatably support an automobile wheel on a suspension device, a hub unit for supporting the wheel is used. As a basic structure of a hub unit for supporting a wheel, a rolling bearing unit is used which rotatably supports a rotating side raceway via rolling elements on the inner or outer diameter side of the stationary side raceway. exist Figure 11 In the figure, the structure of the hub unit for supporting a wheel disclosed in Unexamined-Japanese-Patent No. 2003-74570 is shown. This hub unit 1 for supporting a wheel includes an outer ring 2 as a stationary side raceway, a hub 3 as a rotating side raceway disposed on the inner diameter side of the outer ring 2 , and a hub for freely rotatably supporting the outer ring 2 . 3 multiple rolling elements 4 . ...

AI Technical Summary

Problems solved by technology

[0010] However, the temperature of the outer ring 2 and the hub 3 rises during use

Therefore, due to the difference in the coefficient of linear expansion between the outer ring track member 6 and the outer ring main body 5 made of different materials, or between the outer inner ring track member 10 and the inner inner ring track member 11 and the hub main body 9, it may cause a The preload of the rolling element 4 changes, or a gap is created in the fitting part between these parts

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