Bearing system with flexible bearing bracket

• US 6,700,255 B1
• Filed: 11/01/2000
• Issued: 03/02/2004
• Est. Priority Date: 11/12/1999
• Status: Expired due to Fees

• Current Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Stenta, Christopher Scott
• Primary Examiner(s): LE, DANG D
• Application Number:
  US09/703,425
• Time in Patent Office: 1,217 Days
• Field of Search: 310/90, 310/66, 310/42, 310/43, 384/103, 384/104, 384/119, 384/124, 384/192, 384/196, 384/199, 384/200, 384/495, 384/535, 384/536, 384/558, 384/581, 384/582
• 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 27/02 Sliding-contact bearings
• CPC Class Codes: H02K 5/08 Insulating casings
• CPC Class Codes: H02K 5/15 Mounting arrangements for bearing-shields or end plates
• CPC Class Codes: H02K 5/1672 radially supporting the rotary shaft at both ends of the rotor H02K5/1677 takes precedence
• CPC Class Codes: H02K 5/24 specially adapted for suppression or reduction of noise or vibrations

Abstract

A bearing system that includes a bearing 50 supported in a flexible bearing bracket, for example for use in fractional horsepower shaded pole type electric motors. The bearing system is self aligning, the bracket being able to deflect to compensate for deviations in the radial alignment of the rotor shaft. A rotation lock restrains the bearing against rotation within the bracket. In the preferred embodiment the bracket is composed of an elastomer and the bearing is composed of a high performance plastic polymer, so that the bearing system is non-lubricating.

Claims

1. A bearing system for use with a motor having a rotor shaft and a rotor rotating within an opening through a stator, comprising a bearing bracket comprising a receptacle surrounding a bearing and supporting the bearing in fixed relation to the bracket, wherein the bracket is adapted to be mounted on the motor such that the opening in the bearing is disposed in the vicinity of an axis of the rotor shaft, and wherein the bracket is sufficiently flexible that the rotor shaft can deflect the bracket so that the bearing moves into alignment with an axis of the rotating shaft but the bracket is sufficiently rigid that the rotor is maintained in spaced relation from the stator during operation of the motor and wherein the bracket is provided with two posts and adapted to interlock with complimentary posts on a second bracket.

2. A motor having a rotor shaft and a rotor rotating within an opening through a stator, having a bearing system comprising

one or more bearings each comprising an opening having at least one bearing surface, for maintaining a radial alignment of the rotor shaft, and

one or more bearing brackets each comprising a receptacle surrounding the bearing and supporting the bearing in fixed relation,

wherein the brackets are adapted to be mounted on the motor such that the openings in the bearings are disposed on opposite ends of the stator in the vicinity of an axis of the rotor shaft, and wherein the brackets, at least a portion of said brackets, are sufficiently flexible that the rotor shaft can deflect the brackets so that the bearings move into alignment with an axis of the rotating shaft but the brackets are sufficiently rigid that the rotor is maintained in spaced relation from the stator during operation of the motor a first bracket is provided with at least one ribbed post and a second bracket is provided with at least one ribbed socket complimentary to the post, the post being adapted to be secured in the socket by interlocking between ribs of the post and ribs of the socket.

3. A motor having a rotor shaft and a rotor rotating within an opening through a stator, having a bearing system comprising

one or more bearings each comprising an opening having at least one bearing surface, for maintaining a radial alignment of the rotor shaft, and

one or more bearing brackets each comprising a receptacle surrounding the bearing and supporting the bearing in fixed relation,

wherein the brackets are adapted to be mounted on be motor such that the openings in the bearings are disposed on opposite ends of the stator in the vicinity of an axis of the rotor shaft, and wherein the brackets are sufficiently flexible that the rotor shaft can deflect the brackets so that the bearings move into alignment with an axis of the rotating shaft but the brackets are sufficiently rigid that the rotor is maintained in spaced relation from the stator during operation of the motor in which each bracket is provided with two posts and adapted to interlock with complimentary posts on a second bracket.