Motor end bearings accommodating increased shaft lengths

• US 4,795,926 A
• Filed: 07/20/1987
• Issued: 01/03/1989
• Est. Priority Date: 08/05/1986
• Status: Expired due to Term

• Current Assignee: Mabuchi Motor Company Limited
• Original Assignee: Mabuchi Motor Company Limited
• Inventors: Someya, Ryoichi, Ikegami, Masakazu
• Primary Examiner(s): Wong, Peter S.
• Assistant Examiner(s): Rebsch, D. L.
• Application Number:
  US07/075,604
• Time in Patent Office: 533 Days
• Field of Search: 310/90, 310/89, 310/42, 384/420, 384/424, 384/439
• US Class Current: 310/90
• CPC Class Codes: C21C 7/0056 using cored wires
• CPC Class Codes: H02K 5/1672 radially supporting the rotary shaft at both ends of the rotor H02K5/1677 takes precedence

Abstract

A motor having a housing comprising a case and a case cover, and bearings for supporting a motor rotating shaft fitted to the case and the case cover, respectively. The bearings are secured to the case and include a large diameter portion at one axial end having a diameter larger than the diameter of a bearing mounting hole in the case. The bearings also include a small diameter portion, provided at the other end thereof, which is extended continuously from the large diameter portion via a shoulder having such a diameter as to be fitted into the bearing mounting hole in the case. A recess is provided on the end face of the small diameter portion so as to permit a substantial increase the distance l between the bearings.

Claims

1. A motor, comprising a closed case housing having spaced apart end walls with respective shaft receiving openings, a shaft bearing having a large diameter portion engaged against the exterior of each of said walls, a small diameter portion extending through said opening of a diameter smaller than the diameter of said large diameter portion and with an inner end forming a collar engaged against the associated interior of a respective end wall, a recess defined on the interior of said small diameter portion extending around said shaft, and adjusting washer and bushing means secured to said shaft and accommodated within said recess.

2. A motor according to claim 1 wherein said adjusting washer and bushing means comprises a disc-shaped rotor bushing engaged on said shaft and an adjustable washer between said bushing and the interior of said recess, said bushing and washer fitting entirely within said recess.

3. A motor according to claim 1, wherein the recesses of a circular recess are concentric with said shaft hole and said shaft and said adjusting washer and bushing means.

4. A motor according to claim 1, wherein the interior of said small diameter portion of said bearing is crimped inwardly toward the adjacent wall to form a collar preventing removal of said bushing from said casing.