# US 8,739,919 B2 · Motor and electric power steering system

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- Number: US 8,739,919 B2
- Document ID: US8739919B2
- Status: Granted
- Kind: B2
- Application number: 11/754,047
- Filed: 2007-05-25
- Published: 2007-11-29
- Granted: 2014-06-03
- Earliest claimed: 2006-05-29
- Assignees: Jtekt Corporation
- Applicants: Ken Matsubara; Noboru Niguchi; Naotake Kanda; Toshimasa Soku
- Inventors: Ken Matsubara; Noboru Niguchi; Naotake Kanda; Toshimasa Soku
- Web page: https://patentgrep.com/patent/US8739919B2

## CPC

- B62D 5/0403: {characterised by constructional features, e.g. common housing for motor and gear box}
- H02K 5/15: Mounting arrangements for bearing-shields or end plates
- B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M)
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

The invention provides a motor including: a cylindrical motor case having a bottom that supports an outer circumferential surface of a stator core by an inner circumferential surface thereof; and a bracket that supports an output shaft side bearing and closes an opening of the motor case; wherein the stator core is press-fitted into the motor case from the opening such that a part of the stator core is exposed from the motor case, and a part of the stator core that is not press-fitted to the motor case forms a sliding fitting wall capable of providing a sliding fitting connection with the bracket.

## Claims

### Claim 1

A motor comprising:
a stator core;
a rotor comprising a plurality of magnets and an integral rotation shaft;
an output side bearing that engages and rotationally supports an output side of the rotation shaft;
a cylindrical motor case having a bottom that supports an outer circumferential surface of the stator core by an inner circumferential surface thereof; and
a bracket that directly supports the output side bearing and closes an opening of the motor case;
an end housing that press-fits into the cylindrical motor case, the end housing including a through hole that directly supports another bearing at a side of the rotor opposite the output side bearing; and
a cover that overlaps the bottom of the motor case and that covers the end housing,
wherein the stator core includes a first portion that press-fits into the motor case from the opening and a second portion that extends from the first portion beyond an end of the motor case, the second portion including a sliding fitting connection with the bracket to align a center of the bracket to a center of the rotation shaft based on the stator core, and
wherein the motor is a brushless motor.

### Claim 2 (depends on 1)

A motor according to claim 1, wherein the bracket is formed by a non-magnetic material.

### Claim 3 (depends on 1)

An electric power steering system comprising:
a torque sensor that detects a steering torque applied by a steering member of a vehicle; and
a motor according to claim 1 for assisting a steering operation;
wherein the motor is driven based on the steering torque that is detected by the torque sensor so as to assist the steering operation.

### Claim 4 (depends on 1)

A motor according to claim 1, wherein the center of the bracket is aligned based on the stator core independent of the motor case.

### Claim 5 (depends on 1)

A motor according to claim 1, wherein an inner diameter of the first portion is less than an inner diameter of the second portion.