Rolling bearing unit with combination seal ring

Abstract

The objective of the invention is to obtain a structure which prevents the entry of foreign matter into the in-seal space (26a) between a slinger (16) and a seal ring (17a), which constitute a combination seal ring (12a). The structure ensures the movement of a seal lip (22a) provided to the seal ring (17a). A labyrinth seal (27a) is provided between the outer peripheral edge of a rotation-side circular ring section (19) constituting the slinger (16) and the inner peripheral surface of the stationary-side cylindrical section (23) of a core (20) constituting the seal ring (17a). In addition, a thick wall section (29) is provided to a part of an elastic material (21a) so as to extend along the entire periphery thereof, the elastic material (21a) constituting the seal ring (17a). An auxiliary seal lip (32) having lower rigidity than seal lips (22a-22c) is provided to the thick wall section (29) so as to extend along the entire periphery thereof. The auxiliary seal lip (32) prevents the foreign matter from adhering to the seal lip (22a) and obstructing the movement of the seal lip (22a).

Description

technical field [0001] The present invention relates to an improvement of a rolling bearing unit with a combined seal ring, for example, in a rolling bearing unit for rotatably supporting a wheel of an automobile with respect to a suspension, wherein the rolling bearing unit with a combined seal ring utilizes The combined seal ring composed of the oil slinger and the seal ring closes the end opening of the inner space of the bearing in which a plurality of rolling elements are provided between the opposing peripheral surfaces of the orbiting ring on the rotating side and the orbiting ring on the stationary side. Specifically, by suppressing the amount of foreign matter that enters the sealed internal space between the slinger and the seal ring, a structure capable of maintaining the sealability of the combined seal ring well over a long period of time is realized. Background technique [0002] As a rolling bearing unit for rotatably supporting the wheels and the like of an a...

AI Technical Summary

Problems solved by technology

According to such a structure, the intrusion of foreign matter into the sealed internal space is sufficiently prevented, but the number of parts increases and the cost increases

In addition, the installation space of the portion where the second seal ring is installed increases, and the degree of freedom of design may be limited in order to prevent interference of other items installed adjacent to the rolling bearing unit with the combined seal ring.

In addition, as the second seal lip, a member having the same rigidity as that of the seal lip originally provided on the combined seal ring side is provided in a state of being added to the original seal lip, so there is also a possibility that the sliding contact portion increases and the Disadvantage of increased rotational resistance (dynamic torque)

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