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Document Type and Number:
WIPO Patent Application WO/2018/155286
Kind Code:
Provided is an electric booster comprising a stroke detection device, with which ease of installation in a vehicle can be improved without increasing size. The electric booster comprises an electric motor for propelling a piston of a master cylinder, a stroke detection device that detects the amount of movement of an input member connected to a brake pedal, a rotational angle detector that detects the rotational angle of a rotating shaft of the electric motor, a control device that controls the driving of the electric motor on the basis of the detection results in the stroke detection device and the rotational angle detector, and a casing in which is stored wiring electrically connecting the electric motor and the control device. The stroke detection device comprises a first magnet that moves together with the input member, and a first magnetism detection element that detects magnetism from the first magnet. The rotational angle detector comprises a second magnet that rotates together with the rotating shaft of the electric motor, and a second magnetism detection element that detects magnetism from the second magnet. The first magnetism detection element and the second magnetism detection element are disposed inside the casing.

FUKAYAMA, Norihisa (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
TSUCHIYA, Hidekazu (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
SHIMIZU, Shinji (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
Application Number:
Publication Date:
August 30, 2018
Filing Date:
February 15, 2018
Export Citation:
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HITACHI AUTOMOTIVE SYSTEMS, LTD. (2520, Takaba Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
International Classes:
Domestic Patent References:
Foreign References:
Attorney, Agent or Firm:
ONO, Shinjiro et al. (YUASA AND HARA, Section 206 New Ohtemachi Bldg., 2-1, Ohtemachi 2-chome, Chiyoda-k, Tokyo 04, 〒1000004, JP)
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