To provide a negative pressure type electric booster which can reduce a load of a return spring.SOLUTION: In an electric booster that boosts input a brake operation and outputs the boosted input from an output shaft, an assist mechanism includes a pinion gear provided on a motor shaft of an electric motor, a first gear which receives an output torque of the electric motor through the pinion gear and is moved in an axial direction, and a second gear which is provided coaxially with the first gear and can be connected to the first gear along the movement in the axial direction of the first gear, and the first gear and the second gear are connected to each other when the output torque of the electric motor is equal to or higher than a predetermined value, while the connection is released when the output torque of the electric motor is less than a predetermined value.SELECTED DRAWING: Figure 2
【課題】戻しバネの荷重を低減可能な負圧式電動式倍力装置を提供する。【解決手段】ブレーキ操作の入力を倍力して出力軸から出力させる電動式倍力装置において、アシスト機構は、電動モータのモータ軸に設けられたピニオンギヤと、ピニオンギヤを介して電動モータの出力トルクを受けて軸方向移動する第1のギヤと、第1のギヤと同軸上に設けられ、第1のギヤの軸方向移動に伴って第1のギヤと連結可能な第2のギヤとを含み、第1のギヤ及び第2のギヤは、電動モータの出力トルクが所定値以上のときに連結される一方、電動モータの出力トルクが所定値未満のときに連結が解放される。【選択図】図2
ELECTRIC BOOSTER
電動式倍力装置
2020-10-01
Patent
Electronic Resource
Japanese