Sealing device, and rolling bearing and hub unit incorporating the sealing unit

a sealing device and hub unit technology, applied in mechanical equipment, rotary machine parts, transportation and packaging, etc., can solve the problems of reducing sealing performance at the respective slidably contacting regions, difficult to secure sealing performance, and difficult to secure sufficient sealing performance, so as to improve sealing performance and reduce the strain generated in the axially oriented sealing lip. , the effect of improving sealing performan

US20050104302A1Inactive Publication Date: 2005-05-19NSK LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Publication Date
2005-05-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

A seal member with its base end connected to a metal core has three seal lips. The thickness of the tip end of the intermediate seal lip in the intermediate position is d1, and the thickness of the base end is d2. The thickness of the tip end of the innermost inner seal lip is D1 and that thickness of the base end is D2. In this case, at least part of the base end of the intermediate seal lip and inner seal lip has its thickness regulated to be 0.2·d1≦d2≦0.8·d1, and 0.5·D1≦D2<D1. The tip edge of the inner seal lip is fitted onto the outer peripheral surface of the radially inside cylindrical portion of a slinger with substantially zero interference. Consequently, even if the slinger and metal core are displaced relative to each other, excellent seal performance is secured while increase of torque is inhibited.
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Description

TECHNICAL FIELD

[0001] The seal assembly, the rolling bearing and the hub unit in accordance with the present invention are related, for example, to an improvement of the seal assembly for rolling bearing to be incorporated into the rotatable supporting structure of the support device etc. for the wheels of an automobile or the like. BACKGROUND OF THE INVENTION

[0002] The rotatable supporting structures of various types of mechanical devices are assembled with a rolling bearing such as a ball bearing, a cylindrical roller bearing, a tapered roller bearing or the like. This kind of a rolling bearing is provided with a seal assembly for the purpose of preventing the grease applied inside of this rolling bearing from leaking out of the rolling bearing, and also preventing various types of foreign objects such as rain water, mud, dust and the like from entering the inside of the rolling bearing. FIGS. 25 to 27 show three exemplary structures of the seal assembly provided at the opening ...

Examples

Embodiment Construction

[0063]FIGS. 1 and 2 show a first example of the embodiment of the present invention corresponding to the first to seventh aspects. The seal assembly 17 according to the present invention is composed of a metal core 5, a slinger 6 and a sealing member 7a. The metal core 5 among these elements is formed in a single body by punching process, such as press work, and plastic-working process of a metallic plate such as a low-carbon steel plate. The metal core 5 is formed in a generally annular ring shape having an L-shaped cross section, and composed of a radially outer cylindrical portion 9 which can be internally fitted and fixed to the inner peripheral surface of the end portion of the outer race 8 (see FIG. 25) of the rolling bearing and an inner circular ring portion 10 which is bent inwardly in the radial direction from the end edge at the axially inner end of this radially outer cylindrical portion 9 (the left edge as illustrated in FIGS. 1 and 2).

[0064] The above slinger 6 is als...