To provide a linear motion actuator and an electric brake device capable of preventing occurrence of abrasive wear of a sliding surface and fastening of the sliding surfaces to each other.SOLUTION: A linear motion actuator 1 includes: an electric motor; a linear motion mechanism converting rotary motion of the electric motor to linear motion of a linear motion portion 21; and a housing 20 slidably holding the linear motion portion 21. The linear motion actuator further includes contact surface pressure reduction means 6 for reducing contact surface pressure between the housing 20 and the linear motion portion 21. The linear motion portion 21 has a cylindrical shape, and the linear motion portion 21 is supported by a cylinder chamber 20a of the housing 20 slidably along an axial direction C1. The contact surface pressure reduction means 6 includes: a first diameter reduced portion 6A of which a diameter is gradually reduced radially inward as proceeding toward a base end-side end face 21a at an axial base end portion on an outer peripheral surface of the linear motion portion 21; and a second diameter reduced portion 6B of which a diameter is gradually reduced radially inward as proceeding toward a tip-side end face 21b at an axial tip portion on the outer peripheral surface of the linear motion portion 21.SELECTED DRAWING: Figure 3A
【課題】摺動面のアブレシブ摩耗または摺動面同士の固着が発生することを防止することができる直動アクチュエータおよび電動ブレーキ装置を提供する。【解決手段】直動アクチュエータ1は、電動モータと、電動モータの回転運動を直動部21の直線運動に変換する直動機構と、直動部21を摺動自在に保持するハウジング20とを備える。ハウジング20と直動部21との間の接触面圧を低減する接触面圧低減手段6を備えた。直動部21は円筒状に設けられ、ハウジング20のシリンダ室20aに、直動部21が軸心方向C1に沿って摺動自在に支持される。接触面圧低減手段6は、直動部21の外周面における軸心方向基端部において基端側の端面21aに向かうに従って径方向内方に縮径する第1の縮径部6Aと、直動部21の外周面における軸心方向先端部において先端側の端面21bに向かうに従って径方向内方に縮径する第2の縮径部6Bとを含む。【選択図】図3A
LINEAR MOTION ACTUATOR AND ELECTRIC BRAKE DEVICE
直動アクチュエータおよび電動ブレーキ装置
2024-04-03
Patent
Electronic Resource
Japanese
ELECTRIC LINEAR MOTION ACTUATOR AND ELECTRIC BRAKE DEVICE
European Patent Office | 2024
|ELECTRIC LINEAR MOTION ACTUATOR AND ELECTRIC BRAKE DEVICE
European Patent Office | 2017
|ELECTRIC LINEAR MOTION ACTUATOR AND ELECTRIC BRAKE DEVICE
European Patent Office | 2019
|ELECTRIC LINEAR MOTION ACTUATOR AND ELECTRIC BRAKE DEVICE
European Patent Office | 2019
|ELECTRIC LINEAR MOTION ACTUATOR AND ELECTRIC BRAKE DEVICE
European Patent Office | 2020
|