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Title:
ELECTRIC POWER BOOSTER DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/131616
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing an electric power booster device that can be miniaturized. A reduction gear (51) of this electric power booster device (1) includes a planetary gear reduction mechanism (142) and a spur gear reduction mechanism (143), and the reduction ratio between a rotary shaft of an electric motor and a carrier (149) of the planetary gear reduction mechanism (142) is set to be larger than the reduction ratio between the carrier (149) of the planetary gear reduction mechanism (142) and a screw shaft member. Thus, the outer diameter of a second gear (154) that is integrally provided to each screw shaft member can be set to be minimum. Therefore, the electric power booster device (1) can be miniaturized, and mountability of the electric power booster device (1) can be improved.

Inventors:
SHIGETA HIROSHI (JP)
Application Number:
JP2018/047533
Publication Date:
July 04, 2019
Filing Date:
December 25, 2018
Export Citation:
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Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
B60T13/74; F16H1/28
Foreign References:
JP2010162952A2010-07-29
JP2009101947A2009-05-14
JP2006038110A2006-02-09
Attorney, Agent or Firm:
HANABUSA PATENT & TRADEMARK OFFICE (JP)
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