Title:
MOTOR DRIVE UNIT AND ELECTRIC ASSIST BICYCLE
Document Type and Number:
Japanese Patent JP2018100086
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a motor drive unit which can detect torque with a magneto-striction type torque sensor and detect rotation of a crank shaft etc., prevents assisting drive force from a motor from being transmitted to the crank shaft when a cyclist stops pedaling, and can maintain good torque detection ability, and to provide an electric assist bicycle.SOLUTION: A motor drive unit 20 includes: a wall part of a unit case 22 disposed at a tooth part 21c side of a motor 21; and a first recessed part opening to the rotor part 21b side of the wall part and a second recessed part opening to the side of the wall part opposite to the rotor part 21b side, which are formed by protruding parts protruding from the wall part in an axial direction of a rotary shaft 21a. A first bearing 33 is disposed in the first recessed part and a second bearing 34 is disposed in the second recessed part. The first bearing 33 is disposed so as to partially overlap with the second bearing 34 when viewed in a direction substantially orthogonal to the axial direction of the rotary shaft 21a of the motor 21.SELECTED DRAWING: Figure 2
Inventors:
KAWAKAMI MASAFUMI
OZAWA SATOSHI
FUJII NAOKI
OZAWA SATOSHI
FUJII NAOKI
Application Number:
JP2018006232A
Publication Date:
June 28, 2018
Filing Date:
January 18, 2018
Export Citation:
Assignee:
PANASONIC IP MAN CORP
International Classes:
B62M6/55; B60L15/00; B62J99/00; B62M6/45; B62M6/50; G01L3/10; G01P3/486
Domestic Patent References:
| JP2005225489A | 2005-08-25 | |||
| JPH1059259A | 1998-03-03 | |||
| JPH08290794A | 1996-11-05 | |||
| JP2000164185A | 2000-06-16 |
Foreign References:
| WO2012014396A1 | 2012-02-02 | |||
| WO2012035682A1 | 2012-03-22 |
Attorney, Agent or Firm:
Hiromori Arai
Eisaku Teratani
Shinichi Michisaka
Eisaku Teratani
Shinichi Michisaka