| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric booster device capable of providing a jump-in characteristic, and capable of also increasing a regenerative braking quantity in regenerative cooperation braking, by realizing a natural pedal feeling.SOLUTION: An input piston 32 comprises a first input piston 33 having a tip part 37 facing to a primary chamber 16 and elastically held in a primary piston 10 by springs 72 and 73 and a second input piston 34 having a connection recessed part 50 and relatively movably fitted in the axial direction in a hole part 42 of the first input piston 33, and forms a jump-in clearance JC between a bottom part 33a of the first input piston 33 and a small diameter projection part 52 of the second input piston 34 by a retreat spring when a brake pedal is not operated. Thus, a natural pedal feeling is realized, and a jump-in characteristic can be provided, and a regenerative braking quantity can be increased in regenerative cooperation braking. |
