Electromotive direct-acting actuator

Japanese Patent JP5937334

B2

An electric linear motion actuator capable of accurately controlling the axial position of an outer ring member is provided. The electric linear motion actuator includes: a rotary shaft (10) to be driven by an electric motor (15); a plurality of planetary rollers (11) kept in rolling contact with the cylindrical surface formed on the outer periphery of the rotary shaft (10); a carrier (13) which retains the plurality of planetary rollers (11) such that the planetary rollers (11) are rotatable about axes of the respective planetary rollers (11) while revolving around the rotary shaft (10), and of which the axial movement is restricted; and an outer ring member (12) surrounding the plurality of planetary rollers (11) and supported so as to be slidable in the axial direction. Helical ribs (22) are formed on the inner periphery of the outer ring member (12); and circumferential grooves (23) are formed on the outer periphery of each planetary roller (11) so as to be engaged with the helical ribs (22). The rotation of the rotary shaft (10) is thus converted to the linear motion of the outer ring member (12). A revolution sensor (33) is provided which detects the rotation angle of the carrier (13).

JP2002054708	SCREW SHAFT WHIRL-STOP STRUCTURE OF SCREW JACK
JP2007100751	RECIPROCALLY MOVING MECHANISM
JP3135330	ACTUATOR AND STRUCTURAL BODY THEREOF

Tatsuya Yamasaki
Masuda Yui
Makoto Muramatsu
Masaaki Eguchi
Yuki Rodama

JP2011241064A

June 22, 2016

November 02, 2011

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ntn corporation

F16H25/20; B60T17/22; F16D65/14; F16D65/18; F16D66/00; H02K7/06; H02K7/116

JP2011174575A
JP2002171779A
JP2005133863A
JP2003033077A

WO2011050767A1

Naoya Kamata
Bunji Kamada
Higashio Masahiro
Takayoshi Tagawa
Yaichiro Nakatani

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