ELECTRIC MOTOR

• US 20140184004A1
• Filed: 08/21/2012
• Published: 07/03/2014
• Est. Priority Date: 09/29/2011
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Yamaguchi, Akira
• Granted Patent: US 9,509,191 B2
• Time in Patent Office: Days
• US Class Current: 310/90
• CPC Class Codes: F16C 2380/26 Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
• CPC Class Codes: F16C 25/083 with resilient means acting axially on a race ring to preload the bearing
• CPC Class Codes: F16C 33/78 with a diaphragm, disc, or ring, with or without resilient members F16C33/761 takes precedence
• CPC Class Codes: F16C 35/04 in the case of ball or roller bearings
• CPC Class Codes: H02K 2205/03 Machines characterised by thrust bearings
• CPC Class Codes: H02K 5/173 using bearings with rolling contact, e.g. ball bearings
• CPC Class Codes: H02K 5/1732 radially supporting the rotary shaft at both ends of the rotor H02K5/1737 takes precedence

Abstract

An electric motor includes a rotor having a rotary shaft, a pair of ball bearings for supporting the rotary shaft, and two brackets having bearing housings for holding the ball bearings. The motor further includes a washer between one of the ball bearings and an end wall of one of the bearing housings. The washer includes a plurality of claws. The washer is configured including a ring-shaped yoke and the claws the center parts of which are fastened to the yoke. These claws are configured to be bent in a U-shape, and the center part of the U-shape is fastened to the yoke.

Claims

1. An electric motor comprising:

a rotor including a rotary shaft;

a pair of ball bearings for supporting the rotary shaft; and

two brackets including bearing housings for holding the ball bearings,

wherein a washer is disposed between one of the ball bearings and an end wall of one of the bearing housings, and the washer includes a plurality of claws.

2. The electric motor according to claim 1,

wherein the washer includes:

a ring-shaped yoke; and

the plurality of the claws, center parts of the claws being fastened to the yoke, and

the claws are bent in a U-shape.

3. The electric motor according to claim 2, wherein the yoke has a corrugated shape.

4. The electric motor according to claim 1, wherein the other of the ball bearings and the other of the bearing housings are fixed to each other.

5. The electric motor according to claim 1, wherein the claws are disposed to face a side providing lower one of μ

1 and μ

2 where μ

1 is a static friction coefficient between the one of the ball bearings and the claws of the washer, and μ

2 is a static friction coefficient between the end wall of the one of the bearing housings and the claws of the washer.

6. The electric motor according to claim 1, wherein the claws are disposed facing both sides such that the claws face both the one of the ball bearings and the end wall of the one of the bearing housings.

7. The electric motor according to claim 1, wherein at least one of the brackets is made of a synthetic resin.

8. The electric motor according to claim 1, wherein the one of the ball bearings includes a bearing seal plate, and the bearing seal plate is of a rubber type.

9. The electric motor according to claim 1, wherein an end-wall step height is disposed in the end wall of the one of the bearing housings facing the claws, the end-wall step height fitting into the claws.