Vehicle bearing device

Abstract

Sealing structures (7, 8) are installed to seal opposite open ends of an annular bearing space between an outer member (1) and an inner member (2). A wheel mounting flange (2a) of the inner member (2) is provided with a shielding plate (11). The shielding plate (11) has a tubular wall (11a) forming a labyrinth seal (10) in the vicinity of an outer peripheral surface (1b) of an outboard end of the outer member (1). The outer peripheral surface (1b) is provided with a guide structure (1c) for guiding downwardly water, flowing in between the shielding plate (11) and the outer member (1) along the flange (2a) and the shielding plate (11), and water flowing in between the shielding plate (11) and the outer member (1) along the outer peripheral surface of the outer member (1). The guide structure (1c) is constituted by an annular groove or projection.

Description

technical field [0001] The present invention relates to a bearing device for a wheel in an automobile or the like, and particularly relates to a sealing structure thereof. Background technique [0002] Since the bearing devices used in vehicles such as motor vehicles are exposed to harsh environments such as road surfaces, it is required to reliably prevent the intrusion of dust or muddy water from the outside. The effect of preventing grease leakage. Therefore, for example, a sealing structure as shown in FIG. 9 is adopted (for example, JP-A-2003-202028). The bearing device of this figure is a device in which balls 33 are interposed between the multiple rows of raceway surfaces 34, 35 of the outer member 31 and the inner member 32, and the outer side of the annular space formed between the inner and outer members 32, 31 ( outboard) is sealed by a sealing member 37. The inboard end is sealed by a bearing cap (not shown) by pressing a slinger 38 into the outer diameter of ...

AI Technical Summary

Problems solved by technology

In addition, since the seal lips 40a to 40c of the seal member 37 are brought into contact with the seal contact surface 32c of the inner member 32 with a predetermined interference, the contact resistance increases and the bearing torque increases.

In addition, the above-mentioned three sealing lips 40a-40c use the sealing contact surface 32c, that is, the hub wheel (hub axle) as the sliding surface, but since the sliding surface is constantly stained by muddy water, the sliding surface is prone to rust, and the result is The wear of the sealing lip increases, and if it is used for a long time, muddy water may penetrate into the bearing

In order to prevent muddy water from entering the inside of the bearing, it is considered to further increase the above-mentioned interference, but the contact resistance will be further increased, and the bearing torque will be further increased.

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