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Bearing-apparatus-for-a-driven-shaft-of-an-automobile-having-a-rotational-speed-detector

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Bearing apparatus for a driven shaft of an automobile having a rotational speed detector

Details

Inventors: Seo, Nobuyuki; Nohara, Makoto;
Assignee: Koyo Seiko Co., Ltd. (Osaka, JP)
Primary Examiner: Snow; Walter E.
Assistant Examiner:
Attorney, Agent or Firm: Wenderoth, Lind & Ponack

A bearing apparatus is provided for a driven shaft of an automobile. It includes a rotational speed detector for detecting a rotational speed of a wheel of the automobile by detecting the rotational speed of a circular detected member which has a plurality of projections provided at even intervals in the circumferential direction. The detected member is fixed to one end of a driven shaft. The other end of the driven shaft includes a flange for mounting of a wheel. The shaft is part of an inside member which is rotatably supported by an outside member fixed to a chassis through a plurality of rolling elements. Detected speed is sent to an antilock brake system through a connector. The rotational speed detector, a cover fit to the outside member to enclose at least those parts of the rotational speed detector and detected member which are in opposition, and the connector are embedded in a resin block by a plastic molding technique such that they have a fixed relationship to each other so as to provide an assembly of unitary construction.

DETAILED DESCRIPTION Therefore, the object of the present invention is to solve the above-mentioned problems and to provide a bearing apparatus for a driven shaft provided with a rotational speed detector which enables precise positioning of the rotational speed detector to a detected member, and also can achieve high seal performance and high vibration resistance, thereby enabling a high precision rotational speed detection for a long period of time.
In order to achieve the above object, a bearing apparatus of the present invention is characterized in that the cover, the rotational speed detector and the connector are fixedly connected to each other by a resin block formed through the use of a plastics molding technique so that the cover, the rotational speed detector and the connector are unitary.
More specifically, the bearing apparatus of the present invention comprises a cylindrically shaped outside member which is fixed to a chassis of the automobile; a cylindrically shaped inside member which includes a driven shaft and which is rotatably supported by the outside member through rolling elements.
The rolling elements are held by a retainer and roll between a raceway surface of the outside member and a raceway surface of the inside member, one end of the inside member having a flange for mounting a wheel thereon and the other end of the inside member having a circular detected member which has multiple projections provided at evenly spaced intervals in the circumferential direction of the detected member.
The bearing apparatus also includes a rotational speed detector which is positioned in opposition to the detected member for detecting a rotational speed of the detected member, which is equivalent to that of the wheel, and for generating a rotational speed signal which is sent to an antilock brake system or similar device in the automobile through a connector.
A cover is fit to the outside member for covering at least parts of the detected member and the opposing rotational speed detector

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