Booster of braking force

A booster of a braking force which drives a master cylinder by boosting an operation force of a brake pedal (100) in accordance with a movement amount of an input member (4) that reciprocates by an operation of the brake pedal (100), the booster comprising:

• the input member (4), one end of which is linked to the brake pedal (100), which is inserted and fitted to the inside of a control housing (3) installed in a main housing (2), and which is provided to be freely relatively slidable in an axial direction;
• and
• a flexible damper (22) including a bent portion (22e) that is bent or rotates, a first arm portion (22a) that penetrates the input member (4) in an axially orthogonal direction from the bent portion (22e) and extends to be displaceable, and a second arm portion (22b) which extends along the axial direction of the input member (4) from the bent portion (22e), as a damping member provided in a state of being linked to a part of the input member (4),
• wherein, after the input member (4) is moved in a first direction (A) by the operation of the brake pedal (100) and gives a braking force to a wheel, when the input member (4) moves to return in a second direction (B) which is reverse to the first direction (A) by a biasing force of a spring (7) by releasing the operation of the brake pedal (100) so as to abut against the main housing (2), the damping member (22) absorbs and damps impact when the input member (4) abuts against the main housing (2).

A booster of a braking force which drives a master cylinder by boosting an operation force of a brake pedal (100) in accordance with a movement amount of an input member (4) that reciprocates by an operation of the brake pedal (100), the booster comprising:

• the input member (4), one end of which is linked to the brake pedal (100), which is inserted and fitted to the inside of a control housing (3) installed in a main housing (2), and which is provided to be freely relatively slidable in an axial direction;
• and
• a liquid type damper (31) including a cylinder (31a) which is filled with liquid, a piston (31b) which is accommodated in the cylinder (31a), which is provided to be freely slidable in the axial direction, and in which a throttling communication hole (31e) is formed at a part thereof, and a sleeve-like piston rod (31c) of which one end is connected to the piston (31b), and of which the other end passes through one end surface of the cylinder (31a) and extends to a position that opposes an abutting surface (4b) of the input member (4) through an opening portion (2a) of the main housing (2), as a damping member provided at a position which can abut against the input member (4),
• wherein, after the input member (4) is moved in a first direction (A) by the operation of the brake pedal (100) and gives a braking force to a wheel, when the input member (4) moves to return in a second direction (B) which is reverse to the first direction (A) by a biasing force of a spring (7) provided in the control housing (3) by releasing the operation of the brake pedal (100) so as to abut against the main housing (2), the fluid type damper (31) absorbs and damps impact when the input member (4) abuts against the main housing (2).

A booster of a braking force which drives a master cylinder by boosting an operation force of a brake pedal (100) in accordance with a movement amount of an input member (4) that reciprocates by an operation of the brake pedal (100), the booster comprising:

• the input member (4), one end of which is linked to the brake pedal (100), which is inserted and fitted to the inside of a control housing (3) installed in a main housing (2), and which is provided to be freely relatively slidable in an axial direction;
• and
• an electromagnetic damper (32) including a permanent magnet (32a) embedded in an abutting surface (4b) of the input member (4), a solenoid (32b) embedded in an abutted surface (2b) of the main housing (2) at a position which opposes the permanent magnet (32a), a power source (32c) which supplies power to the solenoid (32b), a switch (32d) which switches ON and OFF the power source, and an electric circuit (32e) which connects the solenoid (32b), the power source (32c), and the switch (32d), as a damping member provided at a part at which the input member (4) and the main housing (2) abut against each other,
• wherein a magnetic force is not generated between the permanent magnet (32a) and the solenoid (32b) by turning OFF the switch (32d) in a standby state where the brake pedal (100) is not operated,
• wherein the magnetic force in a reacting direction is generated between the permanent magnet (32a) and the solenoid (32b) by turning ON the switch (32d) during an operation of operating the brake pedal (100) and during an operation releasing of releasing the operation of the brake pedal (100), and
• wherein, after the input member (4) is moved in a first direction (A) by the operation of the brake pedal (100) and gives a braking force to a wheel, when the input member (4) moves to return in a second direction (B) which is reverse to the first direction (A) by a biasing force of a spring (7) provided in the control housing (3) by releasing the operation of the brake pedal (100) so as to abut against the main housing (2), the electromagnetic damper (32) absorbs and damps impact when the input member (4) abuts against the main housing (2).