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Title:
ELECTRIC DIRECT-ACTING ACTUATOR AND ELECTRIC DISC-BRAKE DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/053469
Kind Code:
A1
Abstract:
A small, compact electric direct-action actuator that has excellent weight balance and has a lock mechanism capable of locking and unlocking the rotation of the rotor shaft of an electric motor. Via a gear reduction mechanism (13), the rotation of the rotor shaft (12) of said electric motor (11) is transmitted, reduced in speed, to a rotary shaft (10). A helical groove (24) is provided in the outer surface of a planetary roller (23) that revolves while rotating due to contact friction with the rotary shaft (10). Engagement between said helical groove (24) and a helical ridge (6) formed on the inner surface of an outer-ring member (5) moves said outer-ring member (5) in the axial direction. The outer-ring member (5) pushes a movable brake pad (53) of an electric disc brake up against a brake disc (51), thereby applying a braking force to the brake disc (51). A plurality of equally spaced lock holes (41) are formed in an intermediate gear (33) of the gear reduction mechanism (13), and a lock pin (42) moved forward and backward by a linear solenoid (43) is engaged with a lock hole (41), thereby locking the rotation of the rotor shaft (12) of the electric motor (11). The linear solenoid (43) is disposed between the electric motor (11) and a housing (1), minimizing the radial increase in size of the electric motor (11) and housing (1).

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Inventors:
MURAMATSU MAKOTO (JP)
YAMASAKI TATSUYA (JP)
EGUCHI MASAAKI (JP)
GOTO TOMOMI (JP)
Application Number:
PCT/JP2011/073803
Publication Date:
April 26, 2012
Filing Date:
October 17, 2011
Export Citation:
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Assignee:
NTN TOYO BEARING CO LTD (JP)
MURAMATSU MAKOTO (JP)
YAMASAKI TATSUYA (JP)
EGUCHI MASAAKI (JP)
GOTO TOMOMI (JP)
International Classes:
F16D65/18; F16D65/14; F16H19/02; F16H25/20
Foreign References:
JP2003336672A2003-11-28
JP2008275053A2008-11-13
JPS58110343A1983-06-30
JP2010090959A2010-04-22
Attorney, Agent or Firm:
KAMADA Bunji et al. (JP)
Bunji Kamata (JP)
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Claims:



 
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