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Fixing-structure-for-coil-assembly-and-power-steering-device

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Details

Inventors: Chikaraishi, Kazuo;
Assignee: NSK Ltd. (Tokyo, JP)
Primary Examiner: Ramirez; Nestor
Assistant Examiner: Le; Dang Dinh
Attorney, Agent or Firm: Evenson, McKeown, Edwards & Lenahan, P.L.L.C.

The device of this invention is provided with a disc-shaped spring having an outer peripheral portion placed into contact with an outer race of a bearing and a tapered portion placed into contact with an end portion of a coil yoke, with the configuration being such that the coil yoke is wedged between a concavity 1d of the housing and the upper edge by the elastic force of the disc-shaped spring. It is therefore possible to fix the coil yoke within the housing without having to provide extra components such as a snap ring, which facilitates machining and assembly. In addition, the sealing effect can be increased by placing the disc-shaped spring into contact with the entire periphery of the outer race of the bearing, thus efficiently preventing the intrusion of impurities.

DETAILED DESCRIPTION The present invention was designed in the light of the above described problems with prior-art devices, and has as an object thereof the provision of a fixing structure for a coil assembly and an electrical power-steering device that are effectively capable of preventing the intrusion of foreign bodies or the like thereinto.
In order to achieve the above objective, a fixing structure for a coil assembly in accordance with the present invention relates to: a fixing structure for fixing a coil assembly with respect to a housing, such that the coil assembly comprises a coil bobbin around which a coil is wound and a circular cylindrical coil yoke accommodating the coil bobbin in the interior thereof, and the coil yoke is fitted into a concavity formed in the housing, wherein: the fixing structure for a coil assembly is provided with a disc-shaped spring that is placed into contact with an outer race of a bearing on one side and with an edge portion of the coil yoke on another side; and the coil yoke is wedged between edge surfaces of the concavity of the housing by the elastic force of the disc-shaped spring.
Since the fixing structure for a coil assembly in accordance with the present invention is provided with a disc-shaped spring that is placed into contact with an outer race of a bearing on one side and with an edge portion of the coil yoke on another side, and the coil yoke is wedged between edge surfaces of the concavity of the housing by the elastic force of the disc-shaped spring, making it possible to fix the coil yoke within the housing without having to provide extra components such as a snap ring, which facilitates machining and assembly.
In addition, the sealing effect can be increased by placing the disc-shaped spring into contact with the entire periphery of the outer race of the bearing, thus efficiently preventing the intrusion of impurities.
If the disc-shaped spring is further provided with a lip portion that is placed into contact with at least one of the bearing and the coil yoke, this would make it possible to further increase the sealing effect

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