MOTOR-DRIVEN LINEAR ACTUATOR

Japanese Patent JP3800719

B2

PROBLEM TO BE SOLVED: To prevent the unexpected variation of the full length of a linear actuator and the separation of the components of the actuator from each other at the time of transportation, etc., by inhibiting the rotation of a section which rotates together with a shaft or a ball nut by frictionally engaging the section with a second fixed to the internal surface of a housing only when a thrust load is applied in the opposite direction.
SOLUTION: A friction ring 35 is arranged between a worm wheel 17 which is a section that rotates together with a rotating shaft 2 and a retaining ring 15 which is a section that is fixed to the internal surface of a housing 7, so that the rotation of the rotating shaft 2 can be inhibited by holding the frictional ring 35 between the wheel 17 and the ring 15, only when a thrust load is applied to an output shaft 6 in the tensile direction which is opposite to the normal direction in which a thrust load is applied when a linear actuator is used. Therefore, the unexpected elongation of the full length of the linear actuator can be prevented. In addition, the coming off of a ball nut can be prevented, because the displacement of the nut 5 in the axial direction against a ball screw section 4 is prevented.

WO/2015/057111	ELECTROMECHANICAL DRIVE UNIT HAVING A DAMPING DEVICE
JP3932885	BALL SCREW
JP5605875	It rolls and is a nut device.

Mikio Yamaguchi
Hironobu Shiono

JP11573297A

July 26, 2006

May 06, 1997

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Nippon Seiko Co., Ltd.

F16H25/22; H02K7/06; A61G7/10; (IPC1-7): H02K7/06; A61G7/10; F16H25/22

JP7332454A
JP8322189A

Takeo Koyama
Kinzo Koyama

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