Pressurization device for the rotor of a motor

• US 5,856,718 A
• Filed: 10/08/1997
• Issued: 01/05/1999
• Est. Priority Date: 04/11/1997
• Status: Expired due to Term

• Current Assignee: Minebea Company Limited (MinebeaMitsumi Inc.)
• Original Assignee: Minebea Company Limited (MinebeaMitsumi Inc.)
• Inventors: Sano, Hiroshi, Yamawaki, Takayuki, Matsushita, Kunitake, Ezure, Hiroaki
• Primary Examiner(s): LaBalle, Clayton E.
• Application Number:
  US08/947,387
• Time in Patent Office: 454 Days
• Field of Search: 310/49 R, 310/90, 310/261, 384/517, 384/518
• US Class Current: 310/90
• CPC Class Codes: H02K 37/22 Damping units
• CPC Class Codes: H02K 5/1672 radially supporting the rotary shaft at both ends of the rotor H02K5/1677 takes precedence

Abstract

A cup shaped base 12 and a cap 13 are coupled, therein coil spring 14 is accommodated to form a holder 11, and the holder is interposed between the bearing 3 of a rotor shaft 4 and a sleeve 5. Different from being directly mounted on the rotor shaft, since the base 12 is provisionally held on the rotor shaft, the operation efficiency at the time of assembling the motor is outstandingly increased.

Claims

1. A rotor pressurization device for a motor, comprising:

a crown-shaped base and cap to be coupled through a spring with each other concentrically on the rotor shaft;

a fixer extending in an axial direction, provided on a coupling surface of said base; and

a pawl portion to be engaged with the fixer, provided on a coupling surface of said cap, wherein the fixer allows an axial movement of said cap and prevents rotation thereof.

2. A rotor pressurization device for a motor according to the claim 1, wherein said base and cap are made of a plastic, at the center of the bottom of one of which is provided a non-circular opening having a diameter a little smaller than the diameter of the rotor shaft, and at the center of the bottom of the opposite one of which is provided a circular having the diameter a little larger than the diameter of the rotor shaft.

3. A rotor pressurizing device for a motor according to the claim 1, wherein said base comprises apertures along the axial direction of the rotor and said cap is provided with a pawl portion to be coupled in the aperture and allowed toslide within a given range, to engage with the end of the aperture.

4. A rotor pressurizing device for a motor according to claim 1, wherein material of said holder is a thermoplastic.

5. A rotor pressurizing device for a motor according to claim 1, wherein said cap is coupled with the base with a clearance.