Title:
ELECTRIC ACTUATOR
Document Type and Number:
WIPO Patent Application WO/2022/075363
Kind Code:
A1
Abstract:
This electric actuator comprises a normally and reversely rotatable electric motor and a motion conversion mechanism for converting the rotation of the electric motor to the reciprocating linear motion of a screw shaft, wherein the motion conversion mechanism comprises a nut rotationally driven by the electric motor and the screw shaft screwed and inserted into the nut in a back and forth movable manner. In the electric actuator, a lubricant holding portion having an outer diameter larger than the screw hole diameter of the nut and capable of housing a lubricant is formed in an end inner circumference of the nut in the axial direction and a lid member is provided that covers the opening end of the lubricant holding portion in the axial direction, thereby suppressing the abrasion of a screwing portion by sufficiently lubricating the screwing portion for the nut and the screw shaft and enabling to enhance the durability of the nut and the screw shaft.
Inventors:
USUI KOJI (JP)
Application Number:
PCT/JP2021/036984
Publication Date:
April 14, 2022
Filing Date:
October 06, 2021
Export Citation:
Assignee:
HITACHI ASTEMO LTD (JP)
International Classes:
H02K7/06; B60T13/74; F16D65/22; F16H25/24
Foreign References:
| JP2019006223A | 2019-01-17 | |||
| JP2015105664A | 2015-06-08 | |||
| JP2019006223A | 2019-01-17 | |||
| JP2001132813A | 2001-05-18 | |||
| JPS5314413U | 1978-02-06 |
Other References:
See also references of EP 4228126A4
Attorney, Agent or Firm:
OCHIAI & CO. (JP)
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