US 12,379,020 B2
Electric actuator
Koji Sato, Shizuoka (JP); and Shinsuke Hirano, Shizuoka (JP)
Assigned to NTN CORPORATION, Osaka (JP)
Appl. No. 18/692,476
Filed by NTN CORPORATION, Osaka (JP)
PCT Filed Sep. 2, 2022, PCT No. PCT/JP2022/033068
§ 371(c)(1), (2) Date Mar. 15, 2024,
PCT Pub. No. WO2023/047916, PCT Pub. Date Mar. 30, 2023.
Claims priority of application No. 2021-155555 (JP), filed on Sep. 24, 2021.
Prior Publication US 2024/0426369 A1, Dec. 26, 2024
Int. Cl. F16H 25/22 (2006.01); H02K 7/06 (2006.01); F16H 25/20 (2006.01)
CPC F16H 25/22 (2013.01) [H02K 7/06 (2013.01); F16H 2025/2081 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An electric actuator comprising:
an electric motor;
a motion conversion mechanism that converts rotational motion of the electric motor into linear motion; and
a casing that accommodates the electric motor and the motion conversion mechanism,
the motion conversion mechanism including a nut that rotates in response to the rotational motion of the electric motor, and a screw shaft that moves forward and backward in an axial direction with rotation of the nut,
characterized in that the casing includes a first case that is made of an aluminum alloy and accommodates the electric motor, and a second case that is made of an aluminum alloy and is coupled to the first case in an axial direction in a state of accommodating the nut and the screw shaft,
the electric motor is supported by the second case via a metal bracket, and
an entire surface of at least one of the second case and the metal bracket is covered with an insulating film.