WO2017022545A1 - マスタシリンダユニット - Google Patents
マスタシリンダユニット Download PDFInfo
- Publication number
- WO2017022545A1 WO2017022545A1 PCT/JP2016/071713 JP2016071713W WO2017022545A1 WO 2017022545 A1 WO2017022545 A1 WO 2017022545A1 JP 2016071713 W JP2016071713 W JP 2016071713W WO 2017022545 A1 WO2017022545 A1 WO 2017022545A1
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- cylinder
- chamber
- piston
- simulator
- passage
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/28—Valves specially adapted therefor
- B60T11/34—Pressure reducing or limiting valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/16—Master control, e.g. master cylinders
- B60T11/20—Tandem, side-by-side, or other multiple master cylinder units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/16—Master control, e.g. master cylinders
- B60T11/236—Piston sealing arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/26—Reservoirs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/002—Air treatment devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/1755—Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve
- B60T8/17552—Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve responsive to the tire sideslip angle or the vehicle body slip angle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/16—Master control, e.g. master cylinders
- B60T11/22—Master control, e.g. master cylinders characterised by being integral with reservoir
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/04—Brake-action initiating means for personal initiation foot actuated
- B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/04—Brake-action initiating means for personal initiation foot actuated
- B60T7/06—Disposition of pedal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
- B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
- B60T8/4081—Systems with stroke simulating devices for driver input
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
- B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
- B60T8/4081—Systems with stroke simulating devices for driver input
- B60T8/409—Systems with stroke simulating devices for driver input characterised by details of the stroke simulating device
Definitions
- the present invention relates to a master cylinder unit.
- This application claims priority based on Japanese Patent Application No. 2015-152774 for which it applied to Japan on July 31, 2015, and uses the content here.
- a brake device equipped with a stroke simulator that applies a reaction force to the brake pedal according to the depressing force of the brake pedal.
- An object of the present invention is to provide a master cylinder unit that can facilitate air bleeding.
- One aspect of the present invention includes a master cylinder that generates hydraulic pressure in a pressure chamber in a cylinder according to an operation amount of a brake pedal, a reservoir that stores brake fluid that is replenished in the pressure chamber, and a communication with the pressure chamber. And a stroke simulator that generates a reaction force corresponding to the operation force of the brake pedal and applies the reaction force to the brake pedal.
- the master cylinder includes a master piston that moves in the cylinder in response to an operation of the brake pedal, and a master supply chamber that is always connected to the reservoir and communicates with the pressure chamber when the brake pedal is not operated.
- the stroke simulator communicates with a simulator piston that moves in a simulator cylinder, and a pressure chamber of the master cylinder on one end side of the simulator piston in the simulator cylinder, and moves the simulator piston by an introduced hydraulic pressure
- a simulator pressure chamber a biasing chamber in which a biasing mechanism for biasing the simulator piston against the introduced hydraulic pressure is disposed on the other end side of the simulator piston in the simulator cylinder; and the simulator
- a simulator supply chamber that is disposed between the simulator pressure chamber and the biasing chamber on the outer peripheral side of the piston and communicates with the master supply chamber, and a first partitioning the simulator supply chamber and the simulator pressure chamber. Seal member and replenishment of the simulator And the urging chamber are partitioned, and when a pressure difference is generated between the simulator replenishing chamber and the urging chamber, a flow of brake fluid from the simulator replenishing chamber to the urging chamber is allowed.
- a second seal member is partitioned, and when a pressure difference is generated between the simulator replenishing chamber and the urging chamber, a flow of brake fluid from the simulator
- the hydraulic circuit diagram of the power module which comprises a brake device with the master cylinder unit of 1st Embodiment.
- a brake device 10 shown in FIG. 1 is for a four-wheeled vehicle.
- the brake device 10 includes a brake pedal 11, a master cylinder unit 12, a power module 13, a brake cylinder 15FR, a brake cylinder 15RL, a brake cylinder 15RR, and a brake cylinder 15FL.
- the brake cylinder 15FR is a brake cylinder for the right front wheel provided on the right front wheel of the four wheels.
- the brake cylinder 15RL is a brake cylinder for the left rear wheel provided on the left rear wheel of the four wheels.
- the brake cylinder 15RR is a brake cylinder for the right rear wheel provided on the right rear wheel of the four wheels.
- the brake cylinder 15FL is a brake cylinder for the left front wheel provided on the left front wheel of the four wheels.
- the brake cylinders 15FR, 15RL, 15RR, and 15FL are hydraulic operation mechanisms such as a disc brake or a drum brake that brake the rotation of the wheels.
- the master cylinder unit 12 has an input rod 21 and a stroke sensor 22.
- the input rod 21 is connected to the brake pedal 11 at the base end side and moves in the axial direction in accordance with the operation amount of the brake pedal 11.
- the stroke sensor 22 detects the amount of movement of the input rod 21.
- the power module 13 generates brake fluid pressure.
- the power module 13 controls the brake fluid pressures of the brake cylinders 15FR, 15RL, 15RR, and 15FL based on the detection result of the stroke sensor 22 and the like.
- the brake device 10 is a brake-by-wire type brake device.
- the brake device 10 is a brake device that constitutes a skid prevention device that prevents a skid of the vehicle.
- the master cylinder unit 12 includes a reservoir 25, a master cylinder 26, and a stroke simulator 27.
- the reservoir 25 stores brake fluid for braking.
- the master cylinder 26 can generate a brake fluid pressure corresponding to the amount of operation of the brake pedal 11.
- the master cylinder 26 exchanges brake fluid with the reservoir 25.
- the stroke simulator 27 generates a reaction force corresponding to the depression force that is the operation force of the brake pedal 11 and applies the reaction force to the brake pedal 11.
- the reservoir 25 is detachably attached to the upper side of the master cylinder 26 in the vertical direction.
- the stroke simulator 27 is provided below the master cylinder 26 in the vertical direction.
- the stroke simulator 27 is provided integrally with the master cylinder 26.
- the master cylinder unit 12 has a metal cylinder member 31 (cylinder main body) formed by processing from one material.
- the cylinder member 31 constitutes a main body portion of the master cylinder unit 12.
- the cylinder member 31 is shared by the master cylinder 26 and the stroke simulator 27.
- the cylinder member 31 includes an MC cylinder 32 (cylinder) and an SS cylinder 33 (simulator cylinder) formed in parallel and integrally.
- the MC cylinder 32 constitutes the master cylinder 26.
- the SS cylinder 33 constitutes a stroke simulator 27. That is, the master cylinder 26 and the stroke simulator 27 are disposed on a cylinder member 31 that is integrally formed from one material.
- a cylinder hole 40 is formed in the MC cylinder 32 of the master cylinder 26. Therefore, the MC cylinder 32 has a cylinder bottom 41 and a cylinder wall 42.
- the cylinder bottom 41 is on the back side of the cylinder hole 40.
- the cylinder wall 42 is cylindrical and extends from the cylinder bottom 41 to the cylinder opening 43 on the opposite side of the cylinder bottom 41.
- a primary piston 46 (master piston) is disposed on the cylinder opening 43 side in the cylinder wall 42 so as to be movable in the axial direction.
- the primary piston 46 constitutes the master cylinder 26 and is made of metal.
- a secondary piston 47 (master piston) is disposed on the cylinder bottom 41 side of the primary piston 46 in the cylinder wall 42 so as to be movable in the axial direction.
- the secondary piston 47 constitutes the master cylinder 26 and is made of metal like the primary piston 46.
- the primary piston 46 is disposed closer to the brake pedal 11 than the secondary piston 47.
- the secondary piston 47 is disposed on the opposite side of the brake pedal 11 from the primary piston 46.
- the primary piston 46 is in contact with the tip of the input rod 21 opposite to the brake pedal 11.
- the primary piston 46 receives the depression force of the brake pedal 11 through the input rod 21.
- the primary piston 46 moves in the MC cylinder 32 according to the operation of the brake pedal 11.
- the above-described stroke sensor 22 is attached to the primary piston 46.
- the stroke sensor 22 detects the amount of movement of the primary piston 46.
- the stroke sensor 22 detects the movement amount of the input rod 21 that moves integrally with the primary piston 46. That is, the stroke sensor 22 detects the operation amount of the brake pedal 11.
- a cylindrical stopper member 51 is screwed to the end of the cylinder wall 42 opposite to the cylinder bottom 41.
- the input rod 21 is inserted inside the stopper member 51.
- a flange member 52 is fixed to an intermediate portion of the input rod 21.
- the stopper member 51 contacts the flange member 52 from the side opposite to the cylinder bottom 41. Accordingly, the stopper member 51 determines a movement limit position in the direction opposite to the cylinder bottom 41 of the input rod 21.
- a stretchable boot 53 is interposed between the stopper member 51 and the input rod 21 to cover these gaps.
- the spring unit 57 includes a retainer 58 and a primary piston spring 59.
- the retainer 58 can be expanded and contracted within a predetermined range.
- the primary piston spring 59 urges the retainer 58 in the extending direction, and is a coil spring.
- the retainer 58 restricts the extension of the primary piston spring 59 so that the maximum length does not exceed a predetermined length.
- the secondary piston 47 connected to the primary piston 46 via the spring unit 57 also moves in the MC cylinder 32 according to the operation of the brake pedal 11.
- the master cylinder 26 has a primary piston 46 and a secondary piston 47 as master pistons that move in the MC cylinder 32 in accordance with the operation of the brake pedal 11.
- a secondary pressure chamber 61 pressure chamber
- a spring unit 62 is provided between the secondary piston 47 and the cylinder bottom 41.
- the spring unit 62 determines the distance between the secondary piston 47 and the cylinder bottom 41 when in the non-braking state where there is no input from the brake pedal 11.
- the spring unit 62 includes a retainer 63 and a secondary piston spring 64.
- the retainer 63 can be expanded and contracted within a predetermined range.
- the secondary piston spring 64 urges the retainer 63 in the extending direction and is a coil spring.
- the retainer 63 restricts the extension of the secondary piston spring 64 so that the maximum length does not exceed a predetermined length.
- the primary piston 46 and the secondary piston 47 are in the form of plungers. Therefore, the master cylinder 26 is a so-called plunger type master cylinder.
- the master cylinder 26 is a tandem type master cylinder having two primary pistons 46 and secondary pistons 47.
- the present invention is not limited to application to the tandem type master cylinder.
- the present invention can be applied to any plunger type master cylinder such as a single type master cylinder having one piston arranged on an MC cylinder, or a master cylinder having three or more pistons, as long as it is a plunger type master cylinder. Is.
- the MC cylinder 32 is integrally formed with a mounting base 65 that protrudes upward in the vertical direction from the cylinder wall 42 of the master cylinder 26.
- An attachment hole 66 and an attachment hole 67 for attaching the reservoir 25 are formed in the attachment base portion 65. Note that the mounting hole 66 and the mounting hole 67 are formed so that the positions of the cylinder holes 40 in the circumferential direction coincide with each other.
- the attachment hole 66 and the attachment hole 67 are formed by shifting the position of the cylinder hole 40 in the axial direction.
- the master cylinder unit 12 is disposed in the vehicle in such a posture that the axial direction of the MC cylinder 32 including the cylinder hole 40 of the master cylinder 26 is along the vehicle front-rear direction, and the cylinder bottom 41 faces the front of the vehicle.
- a secondary discharge path 68 is formed in the cylinder wall portion 42 of the master cylinder 26 in the vicinity of the cylinder bottom portion 41.
- the secondary discharge path 68 extends upward from the cylinder hole 40 so that the center axis thereof is orthogonal to the center axis of the cylinder hole 40.
- a primary discharge path 69 is formed on the cylinder wall portion 42 of the master cylinder 26 on the cylinder opening 43 side with respect to the secondary discharge path 68.
- the primary discharge path 69 has a central axis parallel to a direction perpendicular to the central axis of the cylinder hole 40, and extends horizontally in a vehicle-mounted state.
- the secondary discharge path 68 and the primary discharge path 69 communicate with the power module 13 as indicated by a two-dot chain line in FIG.
- the secondary discharge path 68 and the primary discharge path 69 communicate with the brake cylinders 15FR, 15RL, 15RR, and 15FL via the power module 13.
- the secondary discharge path 68 and the primary discharge path 69 can discharge the brake fluid in the secondary pressure chamber 61 and the primary pressure chamber 56 toward the braking cylinders 15FR, 15RL, 15RR, and 15FL.
- the primary pressure chamber 56 and the secondary pressure chamber 61 communicate with the power module 13.
- a sliding inner diameter portion 70, a large diameter inner diameter portion 71, and a female screw portion 72 are formed on the inner peripheral portion of the cylinder wall portion 42 in order from the cylinder bottom 41 side.
- the inner diameter surface of the sliding inner diameter portion 70 is cylindrical.
- the large-diameter inner diameter portion 71 has a cylindrical surface shape whose inner diameter surface is larger than that of the sliding inner diameter portion 70.
- the female screw portion 72 has a larger diameter than the sliding inner diameter portion 70.
- the sliding inner diameter portion 70 and the large diameter inner diameter portion 71 have the center axes of the inner diameter surfaces aligned with each other. This central axis is the central axis of the cylinder hole 40 and the cylinder wall 42.
- the stroke sensor 22 fixed to the primary piston 46 is disposed in the large-diameter inner diameter portion 71.
- the stroke sensor 22 moves in the axial direction of the MC cylinder 32 within the large diameter inner diameter portion 71.
- the primary piston 46 and the secondary piston 47 are slidably fitted to the inner diameter surface of the sliding inner diameter portion 70.
- the primary piston 46 and the secondary piston 47 are guided by the inner diameter surface and move in the axial direction of the MC cylinder 32.
- a plurality of, specifically, four circumferential grooves 73, circumferential grooves 74, circumferential grooves 75, and circumferential grooves 76 are formed in this order from the cylinder bottom 41 side.
- the circumferential grooves 73 to 76 are all formed in an annular shape, and are all formed in an annular shape.
- the circumferential grooves 73 to 76 have a shape that is recessed radially outward from the inner diameter surface of the sliding inner diameter portion 70.
- the circumferential groove 73 is located closest to the cylinder bottom 41 among the circumferential grooves 73 to 76.
- the circumferential groove 73 is formed in the vicinity of the mounting hole 66 on the cylinder bottom 41 side of the mounting hole 66 and the mounting hole 67.
- An annular piston seal 81 is disposed in the circumferential groove 73 so as to be held in the circumferential groove 73.
- An opening groove 82 is formed closer to the cylinder opening 43 than the circumferential groove 73 in the sliding inner diameter portion 70 of the MC cylinder 32.
- the opening groove 82 is recessed radially outward from the inner diameter surface of the sliding inner diameter portion 70 and is formed in an annular shape.
- the opening groove 82 opens the supply passage 83 into the cylinder hole 40.
- the supply passage 83 is linear and has one end opened in the mounting hole 66 on the cylinder bottom 41 side and the other end opened in the cylinder hole 40.
- the opening groove 82 and the secondary piston 47 overlap with each other in the axial direction, and a portion surrounded by them is a secondary supply chamber 84 (master supply chamber).
- the secondary supply chamber 84 is always in communication with the reservoir 25 via the supply passage 83 and is formed in an annular shape. Part of the secondary supply chamber 84 is formed by the secondary piston 47.
- An axial groove 85 is formed in the upper part on the cylinder bottom 41 side of the circumferential groove 73 of the sliding inner diameter part 70 of the MC cylinder 32.
- the axial groove 85 opens to the circumferential groove 73 and extends linearly from the circumferential groove 73 toward the cylinder bottom 41.
- the axial groove 85 is recessed radially outward from the inner diameter surface of the sliding inner diameter portion 70.
- the secondary discharge path 68 is formed at a position between the cylinder bottom 41 and the circumferential groove 73 and in the vicinity of the cylinder bottom 41.
- the axial groove 85 communicates the secondary discharge passage 68 and the circumferential groove 73 via a secondary pressure chamber 61 between the secondary piston 47 and the cylinder bottom 41.
- the circumferential groove 74 is formed in the sliding inner diameter portion 70 of the MC cylinder 32 on the side opposite to the circumferential groove 73 of the opening groove 82, that is, on the cylinder opening 43 side.
- An annular partition seal 86 is disposed in the circumferential groove 74 so as to be held in the circumferential groove 74.
- the circumferential groove 75 described above is formed in the sliding inner diameter portion 70 of the MC cylinder 32 in the vicinity of the mounting hole 67 on the cylinder opening 43 side.
- An annular piston seal 91 is disposed in the circumferential groove 75 so as to be held in the circumferential groove 75.
- An opening groove 92 is formed on the cylinder opening 43 side of the circumferential groove 75 in the sliding inner diameter portion 70 of the MC cylinder 32.
- the opening groove 92 is recessed radially outward from the inner diameter surface of the sliding inner diameter portion 70 and is formed in an annular shape.
- the opening groove 92 opens the supply passage 93 into the cylinder hole 40.
- the supply passage 93 is linear and has one end opened in the mounting hole 67 on the cylinder opening 43 side and the other end opened in the cylinder hole 40.
- the opening groove 92 and the primary piston 46 overlap with each other in the axial direction, and a portion surrounded by them is a primary supply chamber 94 (master supply chamber).
- the primary supply chamber 94 is always in communication with the reservoir 25 via the supply passage 93 and is formed in an annular shape. A part of the primary supply chamber 94 is formed by the primary piston 46.
- the master cylinder 26 has a secondary supply chamber 84 and a primary supply chamber 94 as master supply chambers that are always connected to the reservoir 25.
- An axial groove 95 is formed in the upper part on the cylinder bottom 41 side than the circumferential groove 75 of the sliding inner diameter part 70 of the MC cylinder 32.
- the axial groove 95 opens to the circumferential groove 75 and extends linearly from the circumferential groove 75 toward the cylinder bottom 41.
- the axial groove 95 is open to the circumferential groove 74.
- the axial groove 95 is recessed radially outward from the inner diameter surface of the sliding inner diameter portion 70.
- the primary discharge path 69 is formed at a position between the circumferential groove 74 and the circumferential groove 75 and in the vicinity of the circumferential groove 74.
- the axial groove 95 communicates the primary discharge passage 69 and the circumferential groove 75 via a primary pressure chamber 56 between the primary piston 46 and the secondary piston 47.
- the circumferential groove 76 is formed in the sliding inner diameter portion 70 of the MC cylinder 32 on the side opposite to the circumferential groove 75 of the opening groove 92, that is, on the cylinder opening 43.
- An annular partition seal 96 is disposed in the circumferential groove 76 so as to be held in the circumferential groove 76.
- the secondary piston 47 is disposed closer to the cylinder bottom 41 than the primary piston 46 of the MC cylinder 32.
- the secondary piston 47 has a cylindrical portion 101 and a bottom portion 102 formed at an intermediate position in the axial direction of the cylindrical portion 101, and has a plunger shape.
- the cylindrical portion 101 of the secondary piston 47 is fitted to each of the sliding inner diameter portion 70 of the MC cylinder 32 and the piston seal 81 and the partition seal 86 provided on the sliding inner diameter portion 70.
- the secondary piston 47 is guided by these and slides in the MC cylinder 32.
- a plurality of ports 103 are formed at the end of the cylindrical portion 101 on the cylinder bottom 41 side.
- the plurality of ports 103 penetrates the cylindrical portion 101 in the radial direction.
- the plurality of ports 103 are radially formed at equal intervals in the circumferential direction of the cylindrical portion 101.
- a spring unit 62 is inserted into the secondary piston 47 on the cylinder bottom 41 side of the cylindrical portion 101. In the spring unit 62, one end of the retainer 63 in the axial direction comes into contact with the bottom 102 of the secondary piston 47, and the other end in the axial direction of the retainer 63 comes into contact with the cylinder bottom 41 of the MC cylinder 32.
- the secondary piston spring 64 determines the distance between the secondary piston 47 and the cylinder bottom 41 in a non-braking state where there is no input from the input rod 21.
- the secondary piston spring 64 contracts when there is an input from the input rod 21 and biases the secondary piston 47 toward the cylinder opening 43 with a force corresponding to the contracted length.
- the portion surrounded by the cylinder bottom 41 side of the cylinder bottom 41 and the cylinder wall 42 and the secondary piston 47 is the secondary pressure chamber 61 described above.
- the secondary pressure chamber 61 generates a brake fluid pressure according to the operation amount of the brake pedal 11 and supplies the brake fluid pressure to the secondary discharge path 68.
- the master cylinder 26 generates hydraulic pressure in the secondary pressure chamber 61 in the MC cylinder 32 according to the operation amount of the brake pedal 11.
- the secondary pressure chamber 61 communicates with the secondary supply chamber 84, that is, the reservoir 25 when the secondary piston 47 is in a position where the port 103 is opened in the opening groove 82.
- the secondary piston 47 opens the port 103 into the opening groove 82 when the brake pedal 11 is not operated.
- the secondary supply chamber 84 provided in the master cylinder 26 is always connected to the reservoir 25 and communicates with the secondary pressure chamber 61 when the brake pedal 11 is not operated.
- the reservoir 25 stores the brake fluid supplied to the secondary pressure chamber 61 in this way.
- the partition seal 86 held in the circumferential groove 74 of the MC cylinder 32 is an integrally molded product made of synthetic rubber.
- the partition seal 86 is a cup seal having a C-shaped one-side shape in the radial cross section including the center line.
- the partition seal 86 is disposed in the circumferential groove 74 with the lip portion facing the cylinder opening 43 side.
- the partition seal 86 has an inner periphery that is in sliding contact with the outer peripheral surface of the secondary piston 47 and an outer periphery that is in contact with the peripheral groove 74 of the MC cylinder 32. Thereby, the partition seal 86 always seals the gap at the position of the secondary piston 47 and the partition seal 86 of the MC cylinder 32.
- the piston seal 81 held in the circumferential groove 73 of the MC cylinder 32 is an integrally molded product made of synthetic rubber such as EPDM.
- the piston seal 81 is a cup seal whose one side shape in the radial cross section including the center line thereof is an E-shape.
- the piston seal 81 is disposed in the circumferential groove 73 with the lip portion facing the cylinder bottom 41 side.
- the piston seal 81 is in sliding contact with the outer peripheral surface of the secondary piston 47 and the outer periphery is in contact with the peripheral groove 73 of the MC cylinder 32. As a result, the piston seal 81 can seal the gap between the secondary piston 47 and the piston seal 81 of the MC cylinder 32.
- the secondary piston 47 is in a non-braking position that opens the port 103 into the opening groove 82 when there is no input from the input rod 21. As shown in FIG. 2, part of the piston seal 81 wraps in the port 103 in the axial direction when the secondary piston 47 is in the non-braking position. In this state, the secondary pressure chamber 61 and the reservoir 25 communicate with each other via the secondary supply chamber 84 and the port 103.
- the primary piston 46 moves to the cylinder bottom 41 side along the axial direction by the input from the input rod 21. Then, the primary piston 46 is pressed via the spring unit 57 and the secondary piston 47 moves toward the cylinder bottom 41 along the axial direction. That is, the primary piston 46 moves directly in the MC cylinder 32 in accordance with the depression force of the brake pedal 11 shown in FIG. The secondary piston 47 also moves directly in the MC cylinder 32 according to the depression force of the brake pedal 11.
- the secondary piston 47 slides on the inner diameter of the sliding inner diameter portion 70 of the MC cylinder 32 and the piston seal 81 and the partition seal 86 held by the MC cylinder 32.
- the secondary piston 47 is in a state where the port 103 is positioned closer to the cylinder bottom 41 than the piston seal 81.
- the piston seal 81 is in a state of sealing between the reservoir 25 and the secondary supply chamber 84 and the secondary pressure chamber 61.
- the brake fluid in the secondary pressure chamber 61 is pressurized.
- the brake fluid pressurized in the secondary pressure chamber 61 is discharged from the secondary discharge path 68.
- the secondary piston 47 will return to the cylinder opening 43 side by the urging force of the secondary piston spring 64 of the spring unit 62. To do. As the secondary piston 47 moves, the volume of the secondary pressure chamber 61 increases. At that time, the return of the brake fluid to the secondary pressure chamber 61 via the secondary discharge path 68 may not catch up with the volume expansion of the secondary pressure chamber 61. Then, after the hydraulic pressure in the secondary supply chamber 84, which is atmospheric pressure, and the hydraulic pressure in the secondary pressure chamber 61 become equal, the hydraulic pressure in the secondary pressure chamber 61 becomes negative.
- the negative pressure in the secondary pressure chamber 61 deforms the piston seal 81 to form a gap between the piston seal 81 and the circumferential groove 73.
- the brake fluid in the secondary supply chamber 84 is supplied to the secondary pressure chamber 61 through this gap.
- the speed at which the hydraulic pressure of the secondary pressure chamber 61 is returned from the negative pressure state to the atmospheric pressure is increased.
- the piston seal 81 is a check valve that allows the brake fluid in the secondary supply chamber 84 to flow into the secondary pressure chamber 61 and restricts the flow of brake fluid in the opposite direction.
- the primary piston 46 is disposed closer to the cylinder opening 43 than the secondary piston 47 of the MC cylinder 32.
- the primary piston 46 has a cylindrical portion 106 and a bottom portion 107 formed at an intermediate position in the axial direction of the cylindrical portion 106, and has a plunger shape.
- the primary piston 46 is fitted to each of the sliding inner diameter portion 70 of the MC cylinder 32, the piston seal 91 provided on the sliding inner diameter portion 70, and the partition seal 96.
- the primary piston 46 is guided by these and slides in the MC cylinder 32.
- the input rod 21 is inserted inside the cylindrical portion 106, the bottom 107 is pressed by the input rod 21, and the primary piston 46 advances toward the cylinder bottom 41 side.
- a plurality of ports 108 are formed on the cylinder bottom 41 side of the cylindrical portion 106.
- the plurality of ports 108 penetrate the cylindrical portion 106 in the radial direction.
- the plurality of ports 108 are formed radially at equal intervals in the circumferential direction of the cylindrical portion 106.
- the above-described spring unit 57 is provided on the secondary piston 47 side of the primary piston 46.
- the spring unit 57 determines the distance between the primary piston 46 and the secondary piston 47 in a non-braking state where there is no input from the input rod 21.
- the retainer 58 comes into contact with the bottom 102 of the secondary piston 47 and the bottom 107 of the primary piston 46.
- the primary piston spring 59 contracts when there is an input from the input rod 21 and the interval between the primary piston 46 and the secondary piston 47 is narrowed.
- the primary piston spring 59 biases the primary piston 46 toward the input rod 21 with a force corresponding to the contracted length.
- the portion surrounded by the cylinder wall 42 of the MC cylinder 32, the primary piston 46, and the secondary piston 47 is the primary pressure chamber 56 described above.
- the primary pressure chamber 56 generates a brake fluid pressure according to the operation amount of the brake pedal 11 and supplies the brake fluid to the primary discharge passage 69.
- the master cylinder 26 generates hydraulic pressure in the primary pressure chamber 56 in the MC cylinder 32 according to the operation amount of the brake pedal 11.
- the primary piston 46 forms a primary pressure chamber 56 that supplies hydraulic pressure to the primary discharge passage 69 between the secondary piston 47 and the MC cylinder 32.
- the primary pressure chamber 56 communicates with the primary supply chamber 94, that is, the reservoir 25 when the primary piston 46 is positioned to open the port 108 into the opening groove 92 as shown in FIG. 2.
- the primary piston 46 opens the port 108 into the opening groove 92 when the brake pedal 11 is not operated.
- the primary supply chamber 94 provided in the master cylinder 26 is always connected to the reservoir 25 and communicates with the primary pressure chamber 56 when the brake pedal 11 is not operated.
- the reservoir 25 stores the brake fluid supplied to the primary pressure chamber 56 in this way.
- the partition seal 96 held in the circumferential groove 76 of the MC cylinder 32 is a common part with the partition seal 86 and is an integrally molded product made of synthetic rubber.
- the partition seal 96 is a cup seal having a C-shaped one-side shape in a radial cross section including the center line thereof.
- the partition seal 96 is disposed in the circumferential groove 76 with the lip portion facing the cylinder bottom 41 side.
- the partition seal 96 is in sliding contact with the outer peripheral surface of the moving primary piston 46, and the outer periphery is in contact with the peripheral groove 76 of the MC cylinder 32. Thereby, the division seal 96 always seals the gap at the position of the division seal 96 of the primary piston 46 and the MC cylinder 32.
- the piston seal 91 held in the circumferential groove 75 of the MC cylinder 32 is a common part with the piston seal 81, and is an integrally molded product made of synthetic rubber such as EPDM.
- the piston seal 91 is a cup seal whose one side shape in the radial cross section including the center line thereof is an E-shape.
- the piston seal 91 is disposed in the circumferential groove 75 with the lip portion facing the cylinder bottom 41 side.
- the piston seal 91 is configured such that the inner periphery is in sliding contact with the outer peripheral surface of the primary piston 46 and the outer periphery is in contact with the peripheral groove 75 of the MC cylinder 32. As a result, the piston seal 91 can seal the gap between the primary piston 46 and the piston seal 91 of the MC cylinder 32.
- the primary piston 46 is in a non-braking position that opens the port 108 into the opening groove 92 when there is no input from the input rod 21.
- a part of the piston seal 91 wraps in the axial direction on the port 108 of the primary piston 46.
- the primary pressure chamber 56 and the reservoir 25 communicate with each other via the primary supply chamber 94 and the port 108.
- the primary piston 46 moves to the cylinder bottom 41 side along the axial direction by the input from the input rod 21. At that time, the primary piston 46 slides on the inner circumference of the sliding inner diameter portion 70 of the MC cylinder 32 and the piston seal 91 and the partition seal 96 held by the MC cylinder 32.
- the primary piston 46 is in a state where the port 108 is positioned closer to the cylinder bottom 41 than the piston seal 91. In this state, the piston seal 91 is in a state of sealing between the reservoir 25 and the primary supply chamber 94 and the primary pressure chamber 56.
- the brake fluid in the primary pressure chamber 56 is pressurized.
- the brake fluid pressurized in the primary pressure chamber 56 is discharged from the primary discharge path 69.
- the primary piston 46 When the input from the input rod 21 is reduced from the state in which the brake fluid in the primary pressure chamber 56 is pressurized, the primary piston 46 is opposite to the cylinder bottom 41 by the biasing force of the primary piston spring 59 of the spring unit 57. Trying to return. The movement of the primary piston 46 increases the volume of the primary pressure chamber 56. At that time, the return of the brake fluid through the primary discharge path 69 may not be able to catch up with the volume expansion of the primary pressure chamber 56. Then, after the hydraulic pressure in the primary replenishing chamber 94, which is atmospheric pressure, becomes equal to the hydraulic pressure in the primary pressure chamber 56, the hydraulic pressure in the primary pressure chamber 56 becomes negative.
- the negative pressure in the primary pressure chamber 56 deforms the piston seal 91 to form a gap between the piston seal 91 and the circumferential groove 75.
- the brake fluid in the primary supply chamber 94 is supplied to the primary pressure chamber 56 through this gap.
- the speed at which the hydraulic pressure in the primary pressure chamber 56 is returned from the negative pressure state to the atmospheric pressure is increased. That is, the piston seal 91 is a check valve that allows the brake fluid in the primary supply chamber 94 to flow into the primary pressure chamber 56 and restricts the flow of brake fluid in the opposite direction.
- the cylinder hole 120 parallel to the cylinder hole 40 of the MC cylinder 32 is formed in the SS cylinder 33 of the stroke simulator 27. Therefore, the SS cylinder 33 has a cylinder bottom 121 and a cylinder wall 122.
- the cylinder bottom 121 is on the back side of the cylinder hole 120.
- the cylinder wall 122 is cylindrical and extends from the cylinder bottom 121 to the cylinder opening 123 on the opposite side of the cylinder bottom 121.
- the cylinder hole 40 and the cylinder hole 120 are formed from the same side surface side of the cylinder member 31, and the horizontal direction positions of the center axes of the cylinder member 31 are matched.
- the center axis of the cylinder hole 120 is arranged in parallel vertically below the center axis of the cylinder hole 40.
- the cylinder bottom 121 of the SS cylinder 33 partially overlaps the cylinder bottom 41 of the MC cylinder 32 in the axial position.
- the cylinder opening 123 of the SS cylinder 33 is aligned with the cylinder opening 43 of the MC cylinder 32 in the axial direction.
- the SS piston 126 (simulator piston) is movably disposed on the cylinder bottom 121 side in the cylinder wall 122.
- the SS piston 126 constitutes the stroke simulator 27 and is made of metal.
- the SS piston 126 moves in the SS cylinder 33.
- a reaction force generation mechanism 127 is provided on the cylinder opening 123 side of the SS piston 126 in the cylinder wall 122. The reaction force generation mechanism 127 biases the SS piston 126 toward the cylinder bottom 121.
- a sliding inner diameter portion 130, an intermediate inner diameter portion 131, a large diameter inner diameter portion 132, and a female thread portion 133 are formed in order from the cylinder bottom 121 side on the inner peripheral portion of the cylinder wall portion 122.
- the inner diameter surface of the sliding inner diameter portion 130 is cylindrical.
- the intermediate inner diameter portion 131 has a cylindrical surface shape whose inner diameter surface is larger than the sliding inner diameter portion 130.
- the large inner diameter portion 132 has a larger inner diameter surface than the intermediate inner diameter portion 131.
- the sliding inner diameter portion 130, the intermediate inner diameter portion 131, and the large diameter inner diameter portion 132 are aligned with the central axis of each inner diameter surface. This central axis is the central axis of the cylinder hole 120 and the cylinder wall 122.
- a plurality of, specifically, two circumferential grooves 136 and circumferential grooves 137 are formed in this order from the cylinder bottom 121 side.
- the circumferential grooves 136 and 137 are all formed in an annular shape, and both are formed in an annular shape.
- the circumferential grooves 136 and 137 have a shape that is recessed radially outward from the inner diameter surface of the sliding inner diameter portion 130.
- a linear discharge passage 141 is formed in the vicinity of the cylinder bottom 121 of the cylinder wall 122.
- the discharge passage 141 extends upward from the cylinder hole 120 and opens into the secondary pressure chamber 61 of the master cylinder 26.
- the discharge passage 141 communicates the cylinder hole 40 and the cylinder hole 120.
- the stroke simulator 27 communicates with the secondary pressure chamber 61 of the master cylinder 26 via the discharge passage 141.
- the discharge passage 141 has a central axis perpendicular to the central axis of the cylinder hole 40 and perpendicular to the central axis of the cylinder hole 120.
- the discharge passage 141 is formed on the same straight line as the secondary discharge passage 68 of the master cylinder 26 and has the same diameter as the secondary discharge passage 68. Therefore, the secondary discharge path 68 and the discharge path 141 are formed by a single drilling process using a single drill.
- the circumferential groove 136 is formed on the cylinder opening 123 side with respect to the discharge passage 141.
- a bleeder passage 142 is formed in the cylinder wall 122.
- the bleeder passage 142 opens at the upper part of the intermediate inner diameter portion 131 on the sliding inner diameter portion 130 side.
- the bleeder passage 142 extends to the outer surface position of the cylinder member 31.
- a bleeder plug 142 a shown in FIG. 1 for opening and closing the bleeder passage 142 is disposed in this portion of the bleeder passage 142.
- the bleeder plug 142a opens the bleeder passage 142 to the outside air in the open state, and blocks the bleeder passage 142 from the outside air in the closed state.
- the bleeder passage 142 communicates with the power module 13 as indicated by a two-dot chain line in FIG.
- annular partition seal 151 (first seal member) is disposed in the circumferential groove 136 that is an annular groove so as to be held in the circumferential groove 136.
- the partition seal 151 also constitutes the stroke simulator 27.
- the partition seal 151 is provided on the SS cylinder 33 side of the SS cylinder 33 and the SS piston 126.
- An axial groove 152 is formed in the upper part on the cylinder bottom 121 side with respect to the circumferential groove 136 of the sliding inner diameter part 130 of the SS cylinder 33.
- the axial groove 152 opens to the circumferential groove 136 and extends linearly from the circumferential groove 136 toward the cylinder bottom 121.
- the axial groove 152 is recessed outward in the radial direction from the inner diameter surface of the sliding inner diameter portion 130.
- the axial groove 152 communicates with the discharge passage 141.
- a linear communication path 155 is formed closer to the cylinder opening 123 than the circumferential groove 136 in the sliding inner diameter portion 130 of the SS cylinder 33.
- the communication path 155 extends upward from the cylinder hole 120 and communicates with the opening groove 82 of the MC cylinder 32, that is, the secondary supply chamber 84.
- the communication passage 155 is formed on the same straight line as the supply passage 83 of the master cylinder 26 and has a smaller diameter than the supply passage 83.
- the supply passage 83 and the communication passage 155 are formed by a single drilling process using a single step drill.
- the communication path 155 is orthogonal to the center axis of the cylinder hole 40 of the MC cylinder 32 and is also orthogonal to the center axis of the cylinder hole 120 of the SS cylinder 33. That is, the communication path 155 is formed in parallel with the discharge path 141.
- the above-mentioned circumferential groove 137 is formed in the sliding inner diameter portion 130 of the SS cylinder 33 in the vicinity of the end portion on the cylinder opening 123 side.
- An annular piston seal 161 (second seal member) is disposed in the circumferential groove 137 that is an annular groove so as to be held in the circumferential groove 137.
- the piston seal 161 also constitutes the stroke simulator 27.
- the piston seal 161 is provided on the SS cylinder 33 side of the SS cylinder 33 and the SS piston 126.
- the partition seal 151 is on the front side (forward direction side) of the piston seal 161 in the traveling direction of the input rod 21, the primary piston 46, and the secondary piston 47 when the brake pedal 11 is depressed. Has been placed.
- the piston seal 161 is disposed on the rear side (reverse direction side) of the partition seal 151 in the traveling direction of the input rod 21, the primary piston 46 and the secondary piston 47 when the brake pedal 11 is depressed.
- a chamber forming groove 162 is formed on the cylinder bottom 121 side of the circumferential groove 137 in the sliding inner diameter portion 130 of the SS cylinder 33.
- the chamber forming groove 162 is recessed radially outward from the inner diameter surface of the sliding inner diameter portion 130 and is formed in an annular shape.
- An axial groove 163 is formed in an upper portion of the sliding inner diameter portion 130 of the SS cylinder 33 on the cylinder bottom 41 side than the circumferential groove 137.
- the axial groove 163 has one end opened to the circumferential groove 137 and linearly extends from the circumferential groove 137 toward the cylinder bottom 41 side.
- the axial groove 163 is recessed outward in the radial direction from the inner diameter surface of the sliding inner diameter portion 130.
- the other end of the axial groove 163 opens into the communication path 155.
- An axial groove 165 is formed above the circumferential groove 137 of the sliding inner diameter portion 130 of the SS cylinder 33 on the cylinder opening 123 side.
- the axial groove 165 has one end opened in the circumferential groove 137 and linearly extends from the circumferential groove 137 toward the cylinder opening 123.
- the axial groove 165 is recessed outward in the radial direction from the inner diameter surface of the sliding inner diameter portion 130.
- the axial groove 163 has a cross-sectional shape in a plane orthogonal to the central axis of the sliding inner diameter portion 130 having an arc shape having a smaller diameter than the inner diameter surface of the sliding inner diameter portion 130.
- the axial grooves 152 and 165 are also circles having a cross-sectional shape in a plane orthogonal to the central axis of the sliding inner diameter portion 130 smaller than the inner diameter surface of the sliding inner diameter portion 130. It is arcuate.
- the axial grooves 85 and 95 of the master cylinder 26 also have a cross-sectional shape in a plane orthogonal to the central axis of the sliding inner diameter portion 70 that is smaller than the inner diameter surface of the sliding inner diameter portion 70.
- the SS piston 126 has a cylindrical portion 171, a bottom portion 172 formed at an intermediate position in the axial direction of the cylindrical portion 171, and a protruding portion 173 protruding in the axial direction from the bottom portion 172. Therefore, the SS piston 126 has a plunger shape.
- the SS piston 126 has a cylindrical portion 171 fitted to each of the sliding inner diameter portion 130 of the SS cylinder 33, the partition seal 151 provided on the sliding inner diameter portion 130, and the piston seal 161. The SS piston 126 is guided by these and slides in the SS cylinder 33.
- both the partition seal 151 and the piston seal 161 seal the ring between the inner periphery of the SS cylinder 33 and the outer periphery of the SS piston 126.
- the SS piston 126 has a bottom portion 172 that is formed closer to the cylinder opening 123 than the center of the cylindrical portion 171 in the axial direction.
- the protruding portion 173 protrudes from the bottom portion 172 to the cylinder opening 123 side.
- a small-diameter outer diameter portion 176 having an outer diameter smaller than that of the other main outer-diameter portion 175 is formed at the end of the cylindrical portion 171 on the cylinder bottom 121 side.
- a plurality of ports 174 are formed in the cylindrical portion 171 at the position of the small diameter outer diameter portion 176.
- the plurality of ports 174 penetrates the cylindrical portion 171 in the radial direction.
- the plurality of ports 174 are formed so as to be radial at equal intervals in the circumferential direction of the cylindrical portion 171.
- An SS replenishment chamber 178 (simulator replenishment chamber) is defined by the chamber seal groove 162, the axial groove 163 and the SS piston 126 of the SS cylinder 33 and defined by the partition seal 151 and the piston seal 161. .
- the SS supply chamber 178 also constitutes the stroke simulator 27.
- This SS replenishing chamber 178 has an annular shape surrounded by the chamber forming groove 162 and the SS piston 126. That is, the SS supply chamber 178 is annular.
- the communication path 155 communicates the secondary supply chamber 84, which is one of the primary supply chamber 94 and the secondary supply chamber 84, with the SS supply chamber 178. Therefore, the communication path 155 communicates the SS supply chamber 178 with the reservoir 25 via the secondary supply chamber 84.
- the SS supply chamber 178 is disposed on the outer peripheral side of the SS piston 126 and communicates with the secondary supply chamber 84.
- the communication path 155 communicates the reservoir 25, the secondary supply chamber 84, and the
- SS pressure chamber 181 a portion surrounded by the cylinder bottom 121, the cylinder bottom 121 side of the cylinder wall 122, and the SS piston 126 is an SS pressure chamber 181 (simulator pressure chamber).
- the SS pressure chamber 181 also constitutes the stroke simulator 27.
- the partition seal 151 partitions the SS supply chamber 178 and the SS pressure chamber 181.
- the SS pressure chamber 181 is always in communication with the secondary pressure chamber 61 of the master cylinder 26 through the discharge passage 141.
- the SS pressure chamber 181 communicates with the secondary pressure chamber 61 of the master cylinder 26 on one end side of the SS piston 126 in the SS cylinder 33.
- the SS pressure chamber 181 moves the SS piston 126 by the introduced hydraulic pressure.
- the reaction force generating mechanism 127 biases the SS piston 126 against the hydraulic pressure introduced into the SS pressure chamber 181 on the other end side of the SS piston 126 in the SS cylinder 33.
- the partition seal 151 held in the circumferential groove 136 of the SS cylinder 33 is an integrally molded product made of synthetic rubber.
- the partition seal 151 is a cup seal having a C-shaped one-side shape in the radial cross section including the center line.
- the partition seal 151 is disposed in the circumferential groove 136 with the lip portion facing the cylinder bottom 121 side.
- the inner periphery of the partition seal 151 is in sliding contact with the outer peripheral surface of the SS piston 126, and the outer periphery is in contact with the peripheral groove 136 of the SS cylinder 33. Thereby, the partition seal 151 always seals the gap between the SS piston 126 and the position of the partition seal 151 of the SS cylinder 33.
- the piston seal 161 held in the circumferential groove 137 of the SS cylinder 33 is an integrally molded product made of synthetic rubber such as EPDM.
- the piston seal 161 is a cup seal whose one side shape in the radial cross section including the center line thereof is an E-shape.
- the piston seal 161 is disposed in the circumferential groove 137 with the lip portion facing the cylinder opening 123 side.
- the piston seal 161 is in sliding contact with the outer peripheral surface of the SS piston 126 and the outer periphery is in contact with the peripheral groove 137 of the SS cylinder 33. Thereby, the piston seal 161 can seal the gap at the position of the piston seal 161 of the SS piston 126 and the SS cylinder 33.
- the reaction force generating mechanism 127 includes a metal lid member 191, a rubber seal member 192, and a buffer member 193 that is an elastic member.
- the lid member 191 is screwed into the female thread portion 133 while being fitted to the large-diameter inner diameter portion 132 of the SS cylinder 33.
- the seal member 192 is held by the lid member 191 and seals a gap between the lid member 191 and the large diameter inner diameter portion 132 of the SS cylinder 33.
- the buffer member 193 is attached to the lid member 191.
- the lid member 191 has a fitting part 195 and a protruding part 196.
- the fitting part 195 is fitted to the SS cylinder 33.
- the protruding portion 196 has an outer diameter smaller than that of the fitting portion 195 and protrudes from the fitting portion 195 toward the cylinder bottom 121 side.
- On the outer peripheral side of the fitting portion 195 a male screw portion 197, a fitting outer diameter portion 198, and a circumferential groove 199 are formed.
- the male screw portion 197 is screwed to the female screw portion 133.
- the fitting outer diameter portion 198 is fitted to the large diameter inner diameter portion 132.
- the circumferential groove 199 is recessed radially inward from the outer diameter surface of the fitting outer diameter portion 198 and has an annular shape.
- a seal member 192 that is an O-ring is disposed in the circumferential groove 199.
- An engaging recess 200 is formed at the center in the radial direction of the fitting portion 195.
- the engaging recess 200 is recessed in the axial direction from the end surface of the fitting portion 195 opposite to the cylinder bottom 121.
- a recess 201 is formed in the protruding portion 196 on the cylinder bottom 121 side at the center in the radial direction.
- the recess 201 is recessed from the tip surface of the protrusion 196 on the cylinder bottom 121 side to the opposite side of the cylinder bottom 121.
- a cylindrical buffer member 193 that is an elastic member is fitted and fixed in the recess 201. When the buffer member 193 is in contact with the bottom surface of the recess 201, the buffer member 193 protrudes further toward the cylinder bottom 121 than the front end surface of the protrusion 196.
- the reaction force generating mechanism 127 includes a metal spring 206 (biasing mechanism), a metal retainer 207, a metal spring unit 208, and a buffer member 209 that is an elastic member.
- One end of the spring 206 is in contact with the fitting portion 195 with the protruding portion 196 inserted inside.
- the retainer 207 is in contact with the other end of the spring 206.
- the spring unit 208 is interposed between the retainer 207 and the SS piston 126.
- the buffer member 209 is disposed in the spring unit 208.
- the spring 206 is a biasing mechanism that generates a biasing force, and is a coil spring.
- the retainer 207 has a lid part 221, a body part 222, and a flange part 223.
- the lid portion 221 has a disk shape.
- the trunk portion 222 extends in the axial direction from the outer peripheral edge portion of the lid portion 221 and has a cylindrical shape.
- the flange portion 223 extends outward in the radial direction from the end portion of the body portion 222 opposite to the lid portion 221 and is formed in an annular shape. In the retainer 207, the flange portion 223 comes into contact with the end portion of the spring 206 and locks it.
- the spring unit 208 includes a retainer 226 and a spring 227 (biasing mechanism).
- the retainer 226 can be expanded and contracted within a predetermined range.
- the spring 227 is a biasing mechanism that biases the retainer 226 in the extending direction, and is a coil spring.
- the retainer 226 restricts the extension of the spring 227 so that its maximum length does not exceed a predetermined length.
- the retainer 226 includes a locking member 231, a guide shaft 232, and a locking member 233.
- the locking member 231 has a disk shape and abuts against one end of the spring 227 to lock it.
- the guide shaft 232 is fixed to the center in the radial direction of the locking member 231 and extends from the locking member 231 into the spring 227.
- the guide shaft 232 has a shaft portion 236 and a flange portion 237.
- the shaft portion 236 extends from the locking member 231.
- the flange portion 237 extends radially outward from the end portion of the shaft portion 236 opposite to the locking member 231 and is formed in an annular shape.
- the locking member 233 has a sliding part 241, a body part 242, and a flange part 243.
- the sliding portion 241 is fitted on the shaft portion 236 of the guide shaft 232 and slides on the shaft portion 236.
- the trunk portion 242 extends from the sliding portion 241 to the side opposite to the locking member 231 and has a cylindrical shape.
- the flange portion 243 extends radially outward from the end edge portion of the body portion 242 opposite to the sliding portion 241 and is formed in an annular shape. In the locking member 233, the flange portion 243 comes into contact with the other end of the spring 227 and locks it.
- the retainer 226 restricts the extension of the spring 227 when the sliding portion 241 of the locking member 233 comes into contact with the flange portion 237 of the guide shaft 232.
- the locking member 231 is inserted into the retainer 207 and is in contact with the lid 221 of the retainer 207.
- the flange portion 243 is brought into contact with the bottom portion 172 of the SS piston 126 with the locking member 233 fitting the protruding portion 173 into the body portion 242.
- the buffer member 209 is an elastic member and has a cylindrical shape. The buffer member 209 is accommodated in the trunk portion 242 of the locking member 233 in a state of being disposed between the protruding portion 173 of the SS piston 126 and the flange portion 237 of the guide shaft 232.
- the portion surrounded by the SS piston 126, the cylinder wall 122 of the SS cylinder 33, and the lid member 191 constitutes a spring chamber 245 (biasing chamber).
- the spring chamber 245 also constitutes the stroke simulator 27.
- the spring chamber 245 is defined as an SS supply chamber 178 by a piston seal 161.
- the piston seal 161 partitions the SS supply chamber 178 and the spring chamber 245.
- the piston seal 161 is a valve that allows a brake fluid to flow from the SS supply chamber 178 to the spring chamber 245 when a pressure difference is generated between the SS supply chamber 178 and the spring chamber 245.
- the piston seal 161 causes the brake fluid to flow from the SS replenishment chamber 178 to the spring chamber 245, and the brake fluid in the opposite direction. It is a check valve that regulates the flow of air.
- One of the SS supply chambers 178 is defined as an SS pressure chamber 181 by a partition seal 151.
- the other of the SS supply chamber 178 is defined by a spring chamber 245 by a piston seal 161. Therefore, the SS supply chamber 178 is disposed between the SS pressure chamber 181 and the spring chamber 245.
- the buffer member 193, the spring 206, the retainer 207, the spring unit 208, and the buffer member 209 of the reaction force generating mechanism 127 are arranged. Therefore, springs 206 and 227 are arranged in the spring chamber 245.
- the bleeder passage 142 of the SS cylinder 33 communicates with the spring chamber 245. As shown in FIG. 1, the spring chamber 245 communicates with a bleeder plug 142 a that opens and closes the spring chamber 245 with respect to the outside air. Further, the spring chamber 245 communicates with the power module 13. One end of the axial groove 165 of the SS cylinder 33 opens into the circumferential groove 137 and the other end opens into the spring chamber 245.
- the spring unit 208 When the SS piston 126 is in contact with the cylinder bottom 121 of the SS cylinder 33 as shown in FIG. 2, the spring unit 208 is contracted and has one end at the bottom 172 of the SS piston 126 as shown in FIG. 4. The other end is in contact with the lid portion 221 of the retainer 207.
- one end of the spring 206 is in contact with the flange portion 223 of the retainer 207, and the other end is in contact with the fitting portion 195 of the lid member 191 fixed to the SS cylinder 33.
- the buffer member 193 is separated from the lid portion 221 of the retainer 207, and the buffer member 209 is separated from the flange portion 237 of the guide shaft 232 of the spring unit 208.
- the springs 206 and 227 bias the SS piston 126 toward the cylinder bottom 121 shown in FIG.
- the partition seal 151 is provided on the SS cylinder 33 side of the SS cylinder 33 and the SS piston 126. At the same time, the partition seal 151 is disposed on the side opposite to the springs 206 and 227 with respect to the piston seal 161 of the SS piston 126.
- the piston seal 161 is provided on the SS cylinder 33 side of the SS cylinder 33 and the SS piston 126. At the same time, the piston seal 161 is disposed closer to the springs 206 and 227 than the partition seal 151 of the SS piston 126.
- the primary piston 46 moves toward the cylinder bottom 41 by the input from the brake pedal 11 shown in FIG. 1, the primary piston 46 pressurizes the brake fluid in the primary pressure chamber 56 as described above.
- the brake fluid pressurized in the primary pressure chamber 56 is sent from the primary discharge path 69 to the power module 13.
- the power module 13 cuts off the hydraulic pressure from the primary discharge path 69 in a normal state.
- the primary piston 46 of the master cylinder 26 is moved to the cylinder bottom 41 side by the input from the brake pedal 11, the primary piston 46 is pressed via the spring unit 57 and the secondary piston 47 is moved to the cylinder bottom 41 side. To do. Then, the secondary piston 47 pressurizes the brake fluid in the secondary pressure chamber 61 as described above.
- the brake fluid pressurized in the secondary pressure chamber 61 is sent from the secondary discharge path 68 to the power module 13.
- the power module 13 blocks the hydraulic pressure from the secondary discharge path 68 in a normal state. Therefore, the pressurized brake fluid in the secondary pressure chamber 61 is introduced into the SS pressure chamber 181 of the stroke simulator 27 via the discharge passage 141 and pressurizes the brake fluid in the SS pressure chamber 181.
- the SS piston 126 moves in a direction away from the cylinder bottom 121, that is, in a direction approaching the lid member 191. Then, the SS piston 126 first contracts the spring 227 of the spring unit 208 shown in FIG. 4 against its urging force. At that time, a reaction force corresponding to the contraction of the spring 227 shown in FIG. 4 is applied to the brake pedal 11 shown in FIG. Next, the SS piston 126 brings the buffer member 209 into contact with the flange portion 237 of the guide shaft 232 while the spring 227 is in the contracted state, and contracts the buffer member 209 against the biasing force. At that time, a reaction force corresponding to the contraction of the spring 227 and the buffer member 209 shown in FIG.
- the piston seal 161 of the partition seal 151 and the piston seal 161 provided for the SS piston 126 is more than the partition seal 151 in the traveling direction of the SS piston 126 when the brake pedal 11 is depressed. Is also arranged on the front side (forward direction side). The partition seal 151 is disposed on the rear side (reverse direction side) of the piston seal 161 in the traveling direction of the SS piston 126 when the brake pedal 11 is depressed.
- the power module 13 has a passage 301, a passage 302, a passage 303, a passage 304, and a passage 305 as shown in FIG.
- the passage 301 communicates with the primary discharge passage 69 of the master cylinder 26 shown in FIG. 1 at the communication port 301a at the outer end.
- the passage 302 branches from the terminal position 301b of the passage 301 and communicates with the brake cylinder 15FR.
- the passage 303 branches from the position 302a of the passage 302 and communicates with the brake cylinder 15RL.
- the passage 304 branches from the position 301b of the passage 301 and communicates with the brake cylinder 15RR.
- the passage 305 branches from the position 301b of the passage 301 and communicates with the brake cylinder 15FL.
- the power module 13 includes a passage 308, a passage 309, a passage 310, a passage 311, and a passage 312.
- the passage 308 communicates with the secondary discharge passage 68 of the master cylinder 26 shown in FIG. 1 at the communication port 308a at the outer end, and the inner end communicates with the position 302a of the passage 302 as shown in FIG.
- the passage 309 branches off from the position 302b of the passage 302 and communicates with the reservoir 25 shown in FIG. 1 through the communication port 309a at the outer end.
- the passage 310 branches from the position 303 a of the passage 303 and communicates with the position 309 b of the passage 309.
- the passage 311 branches from the position 304 a of the passage 304 and communicates with the position 310 a of the passage 310.
- the passage 312 branches from the position 305 a of the passage 305 and communicates with the position 311 a of the passage 311.
- the power module 13 has a passage 315, a passage 316, and a passage 317.
- the passage 315 branches from a position 309c between the communication port 309a and the position 309b of the passage 309 and communicates with a position 302c between the position 302a and the position 301b of the passage 302.
- the passage 315 further communicates with a position 311b between the position 311a and the position 310a of the passage 311.
- the passage 316 branches from a position 302d between the positions 302a and 302b of the passage 302 and communicates with a position 309d between the positions 309b and 309c of the passage 309.
- the passage 317 branches from the position 316a of the passage 316 and communicates with the bleeder passage 142 as shown in FIG. 1 through the communication port 317a at the outer end.
- the power module 13 includes an on-off valve 321, an on-off valve 322, an on-off valve 323, and an on-off valve 324.
- the on-off valve 321 is provided at an intermediate position of the passage 301 and opens and closes the passage 301.
- the on-off valve 322 is provided between the position 301 b and the position 302 c of the passage 302 and opens and closes the passage 302.
- the on-off valve 323 is provided between the position 302 a and the position 302 c of the passage 302 and opens and closes the passage 302.
- the on-off valve 324 is provided between the position 302 b and the position 302 d of the passage 302 and opens and closes the passage 302.
- the power module 13 includes an on-off valve 325, an on-off valve 326, and an on-off valve 327.
- the on-off valve 325 is provided between the position 302 a and the position 303 a of the passage 303 and opens and closes the passage 303.
- the on-off valve 326 is provided between the position 301 b and the position 304 a of the passage 304 and opens and closes the passage 304.
- the on-off valve 327 is provided between the position 301 b and the position 305 a of the passage 305 and opens and closes the passage 305.
- the power module 13 includes an on-off valve 330, an on-off valve 331, an on-off valve 332, an on-off valve 333, and an on-off valve 334.
- the on-off valve 330 is provided at an intermediate position of the passage 308 and opens and closes the passage 308.
- the on-off valve 331 is provided between the position 302 b and the position 309 b of the passage 309 and opens and closes the passage 309.
- the on-off valve 332 is provided between the position 303 a and the position 310 a of the passage 310 and opens and closes the passage 310.
- the on-off valve 333 is provided between the position 304 a and the position 311 a of the passage 311 and opens and closes the passage 311.
- the on-off valve 334 is provided between the position 305 a and the position 311 a of the passage 312 and opens and closes the passage 312.
- the power module 13 has a reservoir 337 and a pump 339.
- the reservoir 337 is provided between the position 309c and the position 302c of the passage 315, and communicates with the reservoir 25 of the master cylinder unit 12 shown in FIG. 1 to store brake fluid.
- the pump 339 is driven by the motor 338 and sucks the brake fluid from the reservoir 337 and discharges it toward the position 302c.
- the pump 339 is provided closer to the position 302 c than the reservoir 337.
- the power module 13 includes an on-off valve 340, an on-off valve 341, and an on-off valve 342.
- the on-off valve 340 is provided between the position 302 c and the position 311 b of the passage 315 and opens and closes the passage 315.
- the on-off valve 341 is provided between the position 302 d and the position 316 a of the passage 316 and opens and closes the passage 316.
- the on-off valve 342 is provided between the position 316 a and the position 309 d of the passage 316 and opens and closes the passage 316.
- the open / close valves 321, 324, 325, 326, 327, 330, and 340 are open as shown in FIG. 5 in the non-driven state where they are not electrically driven, and are closed in the electrically driven state. It becomes a state.
- the on-off valves 322, 323, 331, 332, 333, 334, 341, and 342 are closed as shown in FIG. 5 in the non-driven state where they are not electrically driven, and in the electrically driven state. Open state.
- the power module 13 includes a bypass passage 345, a check valve 346, a bypass passage 347, a check valve 348, a bypass passage 349, and a check valve 350.
- the bypass passage 345 bypasses the on-off valve 324 and connects the position 302b and the position 302d of the passage 302.
- the check valve 346 is provided in the bypass passage 345, and allows only the flow of brake fluid from the position 302b to the position 302d.
- the bypass passage 347 connects the position 303a and the position 302a of the passage 303 by bypassing the on-off valve 325.
- the check valve 348 is provided in the bypass passage 347, and allows only the flow of brake fluid from the position 303a to the position 302a.
- the bypass passage 349 connects the position 304a and the position 301b of the passage 304 by bypassing the on-off valve 326.
- the check valve 350 is provided in the bypass passage 349 and allows only the flow of brake fluid from the position 304a to the position 301b.
- the power module 13 has a bypass passage 351, a check valve 352, a bypass passage 353, and a check valve 354.
- the bypass passage 351 connects the position 305a and the position 301b of the passage 305 by bypassing the on-off valve 327.
- the check valve 352 is provided in the bypass passage 351 and allows only the flow of brake fluid from the position 305a to the position 301b.
- the bypass passage 353 connects the position 316a and the position 302d of the passage 316 by bypassing the on-off valve 341.
- the check valve 354 is provided in the bypass passage 353 and allows only the flow of the brake fluid from the position 316a to the position 302d.
- the power module 13 includes a pressure sensor 357, a pressure sensor 358, a pressure sensor 359, and a pressure sensor 360.
- the pressure sensor 357 is connected to the position 302d of the passage 302 and detects the pressure in this portion.
- the pressure sensor 358 is connected between the position 301b of the passage 305 and the opening / closing valve 327 and the check valve 352, and detects the pressure in this portion.
- the pressure sensor 359 is connected between the communication port 308a of the passage 308 and the on-off valve 330, and detects the pressure at this portion.
- the pressure sensor 360 is connected between the pump 339 in the passage 315 and the position 302c, and detects the pressure in this portion.
- the brake device 10 moves the input rod 21 toward the cylinder bottom 41 of the master cylinder 26 when the driver depresses the brake pedal 11 while the power supply is normal. Then, the stroke sensor 22 detects the movement of the input rod 21. By this detection, the on-off valves 321 and 330 of the power module 13 are electrically driven to be closed, the on-off valves 322 and 323 are electrically driven to be opened, and the on-off valve 340 is electrically driven. Closed.
- the on-off valve 342 is electrically driven to be opened.
- the on-off valve 342 is closed without being electrically driven.
- the on-off valves 321 and 330 close the passage 301 and the passage 308 by being closed as described above. Then, the on-off valves 321 and 330 block the supply of the brake fluid from the secondary discharge path 68 and the primary discharge path 69 of the master cylinder 26 to the braking cylinders 15FR, 15RL, 15RR, and 15FL. Thereby, when the primary piston 46 and the secondary piston 47 move to the cylinder bottom 41 side by the movement of the input rod 21, the brake fluid in the secondary pressure chamber 61 enters the SS pressure chamber 181 of the stroke simulator 27 via the discharge passage 141. be introduced. As a result, the hydraulic pressure in the SS pressure chamber 181 rises and moves the SS piston 126 in the direction of the lid member 191.
- the on-off valves 322 and 323 are electrically driven to be in an open state, and the on-off valve 340 is electrically driven to be in a closed state, so that the pump 339 is connected to the brake cylinders 15FR, 15RL, It will communicate with 15RR and 15FL.
- the pump 339 communicates with the brake cylinders 15FR, 15RL, 15RR, and 15FL via the portion of the passage 315 from the pump 339 to the position 302c and the passages 302 to 305.
- the motor 338 is driven based on the amount of movement of the input rod 21 detected by the stroke sensor 22.
- the pump 339 sucks and discharges the brake fluid from the reservoir 337 and the reservoir 25.
- the discharged brake fluid is supplied from the passage 315 to the brake cylinder 15FR via the passage 302 between the position 302c and the brake cylinder 15FR.
- the discharged brake fluid is supplied from the passage 315 to the brake cylinder 15RL through the passage 302 and the passage 303 between the position 302c and the position 302a.
- the discharged brake fluid is supplied from the passage 315 to the braking cylinder 15RR through the passage 302 and the passage 304 between the position 302c and the position 301b.
- the discharged brake fluid is supplied from the passage 315 to the braking cylinder 15FL via the passage 302 and the passage 305 between the position 302c and the position 301b. In this way, the brake cylinders 15FR, 15RL, 15RR, and 15FL are pressurized. This brakes the wheels.
- the on-off valves 321 and 330 of the power module 13 are not electrically driven but are opened. Therefore, the on-off valves 321 and 330 open the passage 301 and the passage 308. Further, the on-off valves 322, 323, and 341 are in a closed state, the on-off valves 324 to 327 are in an open state, and the on-off valves 331 to 334 and 342 are in a closed state. Therefore, the brake fluid discharged from the primary pressure chamber 56 of the master cylinder 26 to the passage 301 via the primary discharge passage 69 is supplied to the brake cylinder 15RR via the passage 304, and to the brake cylinder 15FL via the passage 305. Supplied respectively.
- the brake fluid discharged from the secondary pressure chamber 61 of the master cylinder 26 to the passage 308 via the secondary discharge passage 68 is transferred to the braking cylinder 15FR via the passage 302 between the position 302a and the braking cylinder 15FR.
- Each is supplied to the brake cylinder 15RL via the passage 303.
- the air in the primary pressure chamber 56, the secondary pressure chamber 61 of the master cylinder 26 and the SS pressure chamber 181 of the stroke simulator 27 is released. Since the SS pressure chamber 181 communicates with the secondary pressure chamber 61 via the discharge passage 141, air is extracted together with the secondary pressure chamber 61. Next, the air in the spring chamber 245 of the stroke simulator 27 is removed.
- the primary piston 46 and the secondary piston 47 of the master cylinder 26 are pushed in when the spring chamber 245 is evacuated. Then, the stroke sensor 22 detects the movement of the input rod 21 as described above. As a result, the on / off valves 321 and 330 of the power module 13 are electrically driven to be closed, the on / off valves 322 and 323 are electrically driven to be opened, and the on / off valve 340 is electrically driven to close. And the on-off valve 342 is electrically driven to open.
- the bleeder plug 142a is closed to close the bleeder passage 142, and the primary piston 46 and the secondary piston 47 of the master cylinder 26 are released from being pushed in.
- the SS piston 126 moves to the cylinder bottom 121 side by the urging force of the spring 206 and the spring 227 of the reaction force generation mechanism 127, and the spring chamber 245 becomes negative pressure.
- the on-off valve 342 is electrically driven and is in an open state, the portion between the communication port 309a and the position 309d of the passage 309, and between the position 309d and the position 316a of the passage 316, Brake fluid flows from the reservoir 25 to the bleeder passage 142 via the passage 317 and is introduced into the spring chamber 245.
- the air is discharged from the spring chamber 245 by appropriately repeating the above air discharge and brake fluid introduction, and the spring chamber 245 is filled with the brake fluid.
- the bleeder plug 142a is closed to close the bleeder passage 142, and the primary piston 46 and the secondary piston 47 of the master cylinder 26 are released from being pushed in.
- the SS piston 126 moves to the cylinder bottom 121 side by the urging force of the spring 206 and the spring 227 of the reaction force generation mechanism 127.
- the inside of the spring chamber 245 becomes a negative pressure, and the piston seal 161 is opened by a differential pressure between the atmospheric pressure SS supply chamber 178 and the atmospheric pressure.
- the brake fluid is introduced into the spring chamber 245 through the reservoir 25, the supply passage 83, the secondary supply chamber 84, the communication passage 155, and the SS supply chamber 178.
- More detailed flow from the communication path 155 is that the brake fluid is connected to the communication path 155, the gap between the axial groove 163 constituting the SS replenishment chamber 178 and the SS piston 126, and the chamber forming groove 162 constituting the SS replenishment chamber 178 and SS.
- the gas flows into the spring chamber 245 through the gap between the piston 126, the gap between the piston seal 161 and the circumferential groove 137, and the gap between the axial groove 165 and the SS piston 126.
- the air is discharged from the spring chamber 245 by appropriately repeating the above air discharge and brake fluid introduction, and the spring chamber 245 is filled with the brake fluid.
- the brake device described in Patent Document 1 includes a stroke simulator that applies a reaction force corresponding to the depression force of the brake pedal to the brake pedal.
- the air release of the stroke simulator is particularly troublesome, and it is desired to facilitate the air release operation.
- the SS supply chamber 178 communicates with the secondary supply chamber 84 that is always connected to the reservoir 25. Further, when the piston seal 161 that partitions the SS supply chamber 178 and the spring chamber 245 has a pressure difference between the SS supply chamber 178 and the spring chamber 245, the brake fluid from the SS supply chamber 178 to the spring chamber 245 is generated. Allow flow. Therefore, the brake fluid can be introduced from the reservoir 25 into the spring chamber 245 through the secondary supply chamber 84 and the SS supply chamber 178 of the master cylinder 26. Therefore, the air bleeding operation can be facilitated.
- a partition seal 151 and a piston seal 161 are provided on the SS cylinder 33 side of the stroke simulator 27, both of which form an annular seal between the inner periphery of the SS cylinder 33 and the outer periphery of the SS piston 126. .
- the piston seal 161 is provided closer to the springs 206 and 227 than the partition seal 151.
- the partition seal 151 and the piston seal 161 define an annular SS supply chamber 178.
- the piston seal 161 defines a spring chamber 245 in which the springs 206 and 227 are disposed and an SS supply chamber 178.
- the reservoir 25 and the secondary supply chamber 84 of the master cylinder 26 and the SS supply chamber 178 are communicated with each other through the communication path 155, and the brake fluid is allowed to flow from the SS supply chamber 178 to the spring chamber 245 by the piston seal 161.
- the brake fluid can be introduced from the reservoir 25 into the spring chamber 245 through the secondary supply chamber 84, the communication path 155, and the SS supply chamber 178 of the master cylinder 26. Therefore, the air bleeding operation can be facilitated.
- parts for introducing brake fluid into the spring chamber 245 on the power module 13 side are not necessary, and the cost can be reduced. That is, when the communication passage 155, the SS replenishing chamber 178, and the piston seal 161 are not provided, for example, the following may be considered in order to introduce the brake fluid into the spring chamber 245.
- the portion from the communication port 309a to the position 309d of the passage 309 of the power module 13 and the passage 317 are used to communicate the reservoir 25 and the bleeder passage 142, and the brake fluid is introduced from the reservoir 25 into the spring chamber 245. In this case, as indicated by a two-dot chain line in FIG.
- bypass passage 380 that bypasses the on-off valve 342 and a check valve 381 that allows only the flow of brake fluid from the communication port 309 a to the communication port 317 a in the bypass passage 380. It is conceivable to provide That is, it is conceivable to provide the bypass passage 380 and the check valve 381 that allows only the flow of the brake fluid from the reservoir 25 to the spring chamber 245. In the first embodiment, the bypass passage 380 and the check valve 381 necessary for such a configuration can be omitted. Therefore, an increase in cost can be suppressed.
- the normal type check valve that presses the valve body with a spring opens with a certain level of valve opening pressure.
- this type of check valve is used as the check valve 381
- the valve is closed with the negative pressure corresponding to the valve opening pressure remaining in the spring chamber 245. End up. If negative pressure remains in the spring chamber 245 in this way, air escape is inhibited.
- the piston seal 161 which is a cup seal with a small valve opening pressure compared with this is used.
- the negative pressure remaining in the spring chamber 245 can be suppressed.
- the length of the brake fluid passage from the reservoir 25 to the spring chamber 245 can be greatly shortened. For this reason, the volume of the passage can be suppressed. Therefore, the air bleeding operation can be further facilitated.
- the SS piston 126 can be satisfactorily returned to the cylinder bottom 121 side by the reaction force generation mechanism 127. For this reason, the change of the pedal stroke of the brake pedal 11 can be suppressed.
- the communication passage 155 communicates the secondary supply chamber 84 of the primary supply chamber 94 and the secondary supply chamber 84 of the master cylinder 26 with the SS supply chamber 178 of the stroke simulator 27. For this reason, it is easy to arrange the MC cylinder 32 and the SS cylinder 33 in the same axial position. Therefore, the axial length of the master cylinder unit 12 can be easily shortened.
- the stroke simulator 27 is provided with an SS piston 126A (simulator piston) that is partially different from the SS piston 126 of the first embodiment.
- a plurality of relief ports 401 are formed at the end of the cylindrical portion 171 of the SS piston 126A opposite to the port 174.
- the plurality of relief ports 401 penetrates in the radial direction of the cylindrical portion 171.
- the plurality of relief ports 401 are formed in a radial shape at equal intervals in the circumferential direction of the cylindrical portion 171.
- the SS piston 126A includes a relief port 401 at a part of the outer periphery thereof.
- the relief port 401 is formed on the opposite side of the port 174 from the bottom 172 of the SS piston 126A. Therefore, the relief port 401 is always in communication with the spring chamber 245.
- the SS piston 126A comes into contact with the cylinder bottom 121 of the SS cylinder 33 as shown in FIG.
- the relief port 401 is disposed on the radially inner side of the piston seal 161 provided in the SS cylinder 33.
- the relief port 401 is positioned at the cylinder bottom 121 rather than the piston seal 161 and communicates with the SS supply chamber 178. That is, the relief port 401 communicates the SS supply chamber 178 and the spring chamber 245.
- the relief port 401 is closed by the piston seal 161.
- the relief port 401 blocks communication between the SS supply chamber 178 and the spring chamber 245.
- the relief port 401 communicates the SS supply chamber 178 and the spring chamber 245 in a state where the hydraulic pressure from the secondary pressure chamber 61 is not introduced into the SS pressure chamber 181. Further, the relief port 401 blocks communication between the SS replenishing chamber 178 and the spring chamber 245 when the hydraulic pressure from the secondary pressure chamber 61 is introduced into the SS pressure chamber 181.
- the SS piston 126A includes a relief port 401 that communicates the SS supply chamber 178 and the spring chamber 245 on the radially inner side of the piston seal 161. For this reason, the air bleeding operation can be further facilitated.
- the SS supply chamber 178 when the air is released from the spring chamber 245 when the power is turned off, such as when the power fails, the SS supply chamber 178 is moved from the SS supply chamber 178 to the spring chamber 245 through the gap between the piston seal 161 and the circumferential groove 137. Brake fluid will flow.
- the piston seal 161 is made of rubber and opens with a small valve opening pressure, the negative pressure corresponding to the valve opening pressure remains in the spring chamber 245 as long as the valve opening pressure is present. This negative pressure inhibits air leakage.
- the relief port 401 communicates the SS supply chamber 178 and the spring chamber 245 at a position slightly before the SS piston 126A contacts the cylinder bottom 121 of the SS cylinder 33.
- the spring chamber 245 can be satisfactorily at atmospheric pressure. Thereby, the air bleeding operation can be further facilitated.
- the cylinder member 31 is provided with a communication path 155B that is partially different from the communication path 155 of the first embodiment.
- a straight passage hole 411 (hole) is formed from the lower surface of the cylinder member 31.
- the passage hole 411 connects the secondary supply chamber 84 and the SS supply chamber 178.
- the passage hole 411 includes a large diameter hole portion 412 (opening portion) and a small diameter hole portion 413.
- the large-diameter hole portion 412 is below the cylinder hole 120.
- the small diameter hole 413 extends to the cylinder hole 40 across the cylinder hole 120.
- the large-diameter hole 412 is an opening on the outside of the cylinder member 31.
- the center hole of the passage hole 411 intersects with the center axis of each of the cylinder holes 40 and 120 obliquely, not perpendicularly. In other words, the passage hole 411 is inclined with respect to the central axis of the cylinder hole 120 that is the central axis of the SS cylinder 33.
- the passage hole 411 is disposed so as to cross the SS cylinder 33.
- the passage hole 411 is inclined so that the upper side is located on the front side in the traveling direction of the primary piston 46 and the secondary piston 47 when the brake pedal 11 is depressed. In other words, the passage hole 411 is inclined so that the upper side is located on the rear side in the traveling direction of the SS piston 126 when the brake pedal 11 is depressed.
- the small diameter hole 413 extends to the opening groove 82 of the MC cylinder 32 through the end position of the axial groove 163 of the SS cylinder 33 on the circumferential groove 136 side.
- the large-diameter hole portion 412 and the small-diameter hole portion 413 are formed by a single drilling process using a single step drill as the drilling process.
- the ball 414 is driven into the large-diameter hole 412 at the lower position of the stroke simulator 27, and the position of the large-diameter hole 412 that is the outer opening of the cylinder member 31 is closed. Yes.
- path hole 411 comprises the communicating path 155B.
- the communication path 155 ⁇ / b> B communicates the SS supply chamber 178 of the stroke simulator 27, the secondary supply chamber 84 of the master cylinder 26, and the reservoir 25.
- the communication path 155B of the third embodiment is inclined with respect to the linear movement direction of the SS piston 126.
- the end of the communication path 155 ⁇ / b> B is closed with a ball 414 at a lower position of the stroke simulator 27.
- the communication path 155B of the third embodiment is formed by a single drilling process using a single drill.
- the communication passage 155 ⁇ / b> B includes a part of a passage hole 411 that linearly connects the lower surface of the SS cylinder 33 of the stroke simulator 27, the SS supply chamber 178, and the secondary supply chamber 84.
- the cylinder member 31 is provided with a discharge passage 141B that is partially different from the discharge passage 141 of the first embodiment.
- a passage hole 421 and a passage hole 422 are provided.
- the passage hole 421 extends from the cylinder hole 40 toward the cylinder hole 120 perpendicular to the central axis thereof.
- the passage hole 422 is formed in the cylinder bottom 121 in parallel with the cylinder hole 120 from the top of the cylinder hole 120.
- These passage holes 421 and the passage holes 422 are orthogonal to each other. Thereby, these passage holes 421 and 422 constitute a discharge passage 141 ⁇ / b> B that communicates the secondary pressure chamber 61 and the SS pressure chamber 181.
- the central axis of the passage hole 421 is orthogonal to the central axis of the cylinder hole 40.
- the central axis of the passage hole 421 is orthogonal to the central axis of the cylinder hole 120.
- the passage hole 421 is formed on the same straight line as the secondary discharge passage 68 of the master cylinder 26.
- the passage hole 421 is formed coaxially with the secondary discharge passage 68. Therefore, the secondary discharge path 68 and the passage hole 421 constituting a part of the discharge passage 141B are formed by a single drilling process using a single drill.
- the communication path 155B that communicates the secondary supply chamber 84 and the SS supply chamber 178 is inclined with respect to the linear movement direction of the SS piston 126. Further, the end of the communication path 155 ⁇ / b> B is blocked by a ball 414 at a lower position of the stroke simulator 27. For this reason, the freedom degree of the layout of the communicating path 155B becomes high.
- the communication passage 155B includes a part of a passage hole 411 that linearly connects the surface of the SS cylinder 33 of the stroke simulator 27, the SS supply chamber 178, and the secondary supply chamber 84.
- the communication path 155B can be formed by a single drilling process using a single drill. Therefore, it becomes easy to process and the processing time can be shortened.
- the partition seal 151 can be disposed close to the cylinder opening 123 side of the SS cylinder 33. For this reason, SS piston 126 can be reduced in size and the depth of cylinder hole 120 can be made shallow. Therefore, it becomes easy to process, the processing time can be shortened, and the size of the cylinder member 31 can be reduced.
- the cylinder member 31 is provided with a communication path 155C that is partially different from the communication path 155B of the third embodiment.
- a straight passage hole 411C (hole) is formed from the lower surface of the cylinder member 31.
- the passage hole 411C connects the primary supply chamber 94 and the SS supply chamber 178.
- the passage hole 411C has a large diameter hole portion 412C (opening) and a small diameter hole portion 413C.
- the large-diameter hole portion 412C is located below the cylinder hole 120.
- the small-diameter hole portion 413C extends to the cylinder hole 40 across the cylinder hole 120.
- the center axis of the passage hole 411 ⁇ / b> C intersects the respective center axes of the cylinder holes 40, 120 obliquely rather than orthogonally.
- the passage hole 411C is inclined so as to be located on the rear side in the advancing direction of the primary piston 46 and the secondary piston 47 when the brake pedal 11 is stepped on as the upper side. In other words, the passage hole 411C is inclined so that the upper side is located on the front side in the traveling direction of the SS piston 126 when the brake pedal 11 is depressed.
- the small-diameter hole 413C extends through the annular chamber forming groove 162 of the SS cylinder 33 and extends to the opening groove 92 of the MC cylinder 32.
- the large-diameter hole portion 412C and the small-diameter hole portion 413C are formed by a single drilling process using a single step drill.
- the ball 414 is driven into the large-diameter hole portion 412C at the lower position of the stroke simulator 27, and the position of the large-diameter hole portion 412C is closed.
- bowl 414 of the passage hole 411C comprises the communicating path 155C.
- the communication path 155 ⁇ / b> C communicates the SS supply chamber 178 of the stroke simulator 27 with the primary supply chamber 94 of the master cylinder 26.
- the communication path 155C of the fourth embodiment is inclined with respect to the linear movement direction of the SS piston 126. Further, the end of the communication path 155 ⁇ / b> C is closed with a ball 414 at a lower position of the stroke simulator 27.
- the communication path 155C of the fourth embodiment is formed by a single drilling process using a single drill.
- the communication passage 155 ⁇ / b> C includes a part of a passage hole 411 ⁇ / b> C that linearly connects the lower surface of the SS cylinder 33 of the stroke simulator 27, the SS supply chamber 178, and the primary supply chamber 94.
- the relief port 401 similar to that of the second embodiment may be provided in the SS piston 126 of the third and fourth embodiments.
- the above embodiments include a reservoir that stores brake fluid for braking, a master cylinder that exchanges the reservoir and the brake fluid, and a stroke simulator that applies a reaction force according to the depression force of the brake pedal to the brake pedal.
- the master cylinder includes a master cylinder piston that linearly moves within the cylinder of the master cylinder in response to the depression force of the brake pedal, and an annular first replenishment chamber that is always connected to the reservoir.
- the stroke simulator is provided on a stroke simulator piston, a spring for biasing the stroke simulator piston, a cylinder side of the stroke simulator, and disposed on a side opposite to the spring of the stroke simulator piston,
- a first cup seal that seals between an inner circumference of a cylinder of the stroke simulator and an outer circumference of the piston for the stroke simulator; and provided on the cylinder side of the stroke simulator and on the spring side of the stroke simulator piston
- a second cup seal that is arranged and seals between the inner periphery of the cylinder of the stroke simulator and the outer periphery of the piston for the stroke simulator, the first cup seal, and the second
- the second cup seal is a valve that allows a brake fluid to flow from the second supply chamber to the spring chamber, and communicates the reservoir, the first supply chamber, and the second supply chamber.
- a communication path is provided.
- the reservoir, the first supply chamber of the master cylinder, and the second supply chamber of the stroke simulator are communicated with each other through the communication path, and the second cup seal seals the brake from the second supply chamber to the spring chamber. Allow the liquid to flow.
- the brake fluid can be introduced from the reservoir into the spring chamber via the first supply chamber of the master cylinder, the communication path, and the second supply chamber of the stroke simulator. Therefore, the air bleeding operation can be facilitated.
- the master cylinder piston includes a primary piston disposed on the brake pedal side and a secondary piston disposed on the opposite side of the primary piston from the brake pedal.
- the first supply chamber includes a primary supply chamber partially formed by the primary piston and a secondary supply chamber partially formed by the secondary piston.
- the communication path communicates the secondary supply chamber and the second supply chamber. In this way, the communication path communicates the secondary supply chamber and the second supply chamber among the primary supply chamber and the secondary supply chamber, so that the axial position of the cylinder of the master cylinder and the cylinder of the stroke simulator can be easily aligned. .
- the stroke simulator piston is a part of the outer periphery of the stroke simulator piston and includes a relief port on the radially inner side of the second cup seal. For this reason, the air bleeding operation can be further facilitated.
- the communication path is inclined with respect to the linear motion direction of the stroke simulator piston.
- the end of the communication path is closed with a ball at a lower position of the stroke simulator. For this reason, the freedom degree of the layout of a communicating path becomes high.
- the communication path includes a part of a hole that linearly connects the surface of the cylinder of the stroke simulator, the first supply chamber, and the second supply chamber. For this reason, as the drilling process, the communication path can be formed by a single drilling process using a single drill. Therefore, it becomes easy to process and the processing time can be shortened.
- a master cylinder that generates hydraulic pressure in a pressure chamber in the cylinder according to an operation amount of a brake pedal, a reservoir that stores brake fluid to be replenished in the pressure chamber, A stroke simulator that communicates with the pressure chamber and generates a reaction force according to the operation force of the brake pedal and applies the reaction force to the brake pedal.
- the master cylinder includes a master piston that moves in the cylinder in response to an operation of the brake pedal, and a master supply chamber that is always connected to the reservoir and communicates with the pressure chamber when the brake pedal is not operated.
- the stroke simulator communicates with a simulator piston that moves in a simulator cylinder, and a pressure chamber of the master cylinder on one end side of the simulator piston in the simulator cylinder, and moves the simulator piston by an introduced hydraulic pressure
- a simulator pressure chamber a biasing chamber in which a biasing mechanism for biasing the simulator piston against the introduced hydraulic pressure is disposed on the other end side of the simulator piston in the simulator cylinder; and the simulator
- a simulator supply chamber that is disposed between the simulator pressure chamber and the biasing chamber on the outer peripheral side of the piston and communicates with the master supply chamber, and a first partitioning the simulator supply chamber and the simulator pressure chamber. Seal member and replenishment of the simulator And the urging chamber are partitioned, and when a pressure difference is generated between the simulator replenishing chamber and the urging chamber, a flow of brake fluid from the simulator replenishing chamber to the urging chamber is allowed.
- a second seal member is partitioned, and when a pressure difference is generated between the simulator replenishing chamber and the urging chamber, a flow of brake fluid from the simulator
- the second seal member is a cup seal that is in sliding contact with the outer periphery of the simulator piston and disposed in an annular groove of the simulator cylinder.
- the pressure chamber communicates with a power module that controls a brake cylinder provided on a wheel.
- the urging chamber communicates with a bleeder plug that opens and closes the urging chamber with respect to the outside air and communicates with the power module.
- the simulator piston is replenished with the simulator in a state where the hydraulic pressure from the pressure chamber of the master cylinder is not introduced into the simulator pressure chamber.
- a relief port that communicates between the simulator supply chamber and the urging chamber when fluid pressure from the pressure chamber of the master cylinder is introduced into the simulator pressure chamber. Is formed.
- the master cylinder and the stroke simulator are arranged in a cylinder body integrally formed from one material.
- a communication path that communicates the reservoir, the master supply chamber, and the simulator supply chamber is formed with a hole that is inclined with respect to the central axis of the simulator cylinder and is arranged to intersect the simulator cylinder. The opening of the hole outside the cylinder body is closed.
- the master piston is disposed on a side opposite to the brake pedal of the primary piston and the primary piston disposed on the brake pedal side.
- Secondary piston The master supply chamber includes a primary supply chamber partially formed by the primary piston and a secondary supply chamber partially formed by the secondary piston.
- a communication path that connects the reservoir, the master supply chamber, and the simulator supply chamber communicates the secondary supply chamber and the simulator supply chamber.
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Transmission Of Braking Force In Braking Systems (AREA)
- Regulating Braking Force (AREA)
- Braking Systems And Boosters (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
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Abstract
Description
本願は、2015年7月31日に、日本に出願された特願2015-152774号に基づき優先権を主張し、その内容をここに援用する。
第1実施形態について図1~図6を参照して以下に説明する。図1に示すブレーキ装置10は、四輪自動車用のものである。ブレーキ装置10は、ブレーキペダル11と、マスタシリンダユニット12と、パワーモジュール13と、制動用シリンダ15FRと、制動用シリンダ15RLと、制動用シリンダ15RRと、制動用シリンダ15FLとを有している。制動用シリンダ15FRは、四輪のうちの右前の車輪に設けられる右前輪用の制動用シリンダである。制動用シリンダ15RLは、四輪のうちの左後の車輪に設けられる左後輪用の制動用シリンダである。制動用シリンダ15RRは、四輪のうちの右後の車輪に設けられる右後輪用の制動用シリンダである。制動用シリンダ15FLは、四輪のうちの左前の車輪に設けられる左前輪用の制動用シリンダである。制動用シリンダ15FR,15RL,15RR,15FLは、車輪の回転にブレーキをかけるディスクブレーキあるいはドラムブレーキ等の液圧作動機構である。
次に、第2実施形態を主に図7に基づいて第1実施形態との相違部分を中心に説明する。なお、第1実施形態と共通する部位については、同一称呼、同一の符号で表す。
次に、第3実施形態を主に図8に基づいて第1実施形態との相違部分を中心に説明する。なお、第1実施形態と共通する部位については、同一称呼、同一の符号で表す。
次に、第4実施形態を主に図9に基づいて第3実施形態との相違部分を中心に説明する。なお、第3実施形態と共通する部位については、同一称呼、同一の符号で表す。
12 マスタシリンダユニット
13 パワーモジュール
25 リザーバ
26 マスタシリンダ
27 ストロークシミュレータ
31 シリンダ部材(シリンダ本体)
32 MCシリンダ(シリンダ)
33 SSシリンダ(シミュレータシリンダ)
46 プライマリピストン(マスタピストン)
47 セカンダリピストン(マスタピストン)
56 プライマリ圧力室(圧力室)
61 セカンダリ圧力室(圧力室)
84 セカンダリ補給室(マスタ補給室)
94 プライマリ補給室(マスタ補給室)
126,126A SSピストン(シミュレータピストン)
142a ブリーダプラグ
151 区画シール(第1のシール部材)
155,155B,155C 連通路
161 ピストンシール(第2のシール部材)
178 SS補給室(シミュレータ補給室)
181 SS圧力室(シミュレータ圧力室)
206,227 スプリング(付勢機構)
245 スプリング室(付勢室)
401 リリーフポート
411,411C 通路穴(穴)
412,412C 大径穴部(開口部)
414 ボール
Claims (6)
- ブレーキペダルの操作量に応じてシリンダ内の圧力室に液圧を発生するマスタシリンダと、
前記圧力室に補給されるブレーキ液を貯留するリザーバと、
前記圧力室に連通し、前記ブレーキペダルの操作力に応じた反力を発生して前記ブレーキペダルに付与するストロークシミュレータと、を備え、
前記マスタシリンダは、
前記ブレーキペダルの操作に応じて前記シリンダ内を移動するマスタピストンと、
前記リザーバに常時接続され前記ブレーキペダルの非操作時に前記圧力室と連通するマスタ補給室と、を備え、
前記ストロークシミュレータは、
シミュレータシリンダ内を移動するシミュレータピストンと、
前記シミュレータシリンダ内における前記シミュレータピストンの一端側で、前記マスタシリンダの圧力室に連通され、導入される液圧によって前記シミュレータピストンを移動させるシミュレータ圧力室と、
前記シミュレータシリンダ内における前記シミュレータピストンの他端側で、前記導入される液圧に抗して前記シミュレータピストンを付勢する付勢機構が配置される付勢室と、
前記シミュレータピストンの外周側で前記シミュレータ圧力室と前記付勢室との間に配置され、前記マスタ補給室に連通されるシミュレータ補給室と、
該シミュレータ補給室と前記シミュレータ圧力室とを区画する第1のシール部材と、
前記シミュレータ補給室と前記付勢室とを区画して、前記シミュレータ補給室と前記付勢室との間に圧力差が生じたときに、前記シミュレータ補給室から前記付勢室へのブレーキ液の流れを許容する第2のシール部材と、
を有する、マスタシリンダユニット。 - 前記第2のシール部材は、前記シミュレータピストンの外周に摺接し、前記シミュレータシリンダの環状溝に配置されるカップシールである、請求項1に記載のマスタシリンダユニット。
- 前記圧力室は、車輪に設けられる制動用シリンダを制御するパワーモジュールに連通され、
前記付勢室は、該付勢室を外気に対して開閉するブリーダプラグに連通されるとともに、前記パワーモジュールに連通される、請求項1または2に記載のマスタシリンダユニット。 - 前記シミュレータピストンは、
前記シミュレータ圧力室に前記マスタシリンダの圧力室からの液圧が導入されていない状態で、前記シミュレータ補給室と前記付勢室とを連通し、
前記シミュレータ圧力室に前記マスタシリンダの圧力室からの液圧が導入されたときに、前記シミュレータ補給室と前記付勢室との連通を遮断するリリーフポートが形成されている、請求項1乃至3の何れか一項に記載のマスタシリンダユニット。 - 前記マスタシリンダと前記ストロークシミュレータとは、1つの素材から一体に形成されるシリンダ本体に配置されてなり、
前記リザーバと前記マスタ補給室と前記シミュレータ補給室とを連通する連通路は、前記シミュレータシリンダの中心軸線に対して傾斜して該シミュレータシリンダを交差して配置される穴で形成されており、該穴のシリンダ本体外方の開口部は、閉塞されている、請求項1乃至4の何れか一に記載のマスタシリンダユニット。 - 前記マスタピストンは、前記ブレーキペダル側に配置されるプライマリピストンと、前記プライマリピストンの前記ブレーキペダルとは反対側に配置されるセカンダリピストンとからなり、
前記マスタ補給室は、前記プライマリピストンで一部形成されるプライマリ補給室と、前記セカンダリピストンで一部形成されるセカンダリ補給室とからなり、
前記リザーバと前記マスタ補給室と前記シミュレータ補給室とを連通する連通路は、前記セカンダリ補給室と前記シミュレータ補給室とを連通する、請求項1乃至5の何れか一項に記載のマスタシリンダユニット。
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DE112016003470.9T DE112016003470T5 (de) | 2015-07-31 | 2016-07-25 | Hauptzylindereinheit |
JP2017532506A JP6407440B2 (ja) | 2015-07-31 | 2016-07-25 | マスタシリンダユニット |
US15/746,436 US10668909B2 (en) | 2015-07-31 | 2016-07-25 | Master cylinder unit |
CN201680031431.1A CN107614336B (zh) | 2015-07-31 | 2016-07-25 | 主缸单元 |
KR1020177033841A KR102138417B1 (ko) | 2015-07-31 | 2016-07-25 | 마스터 실린더 유닛 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018020815A1 (ja) * | 2016-07-26 | 2018-02-01 | 日立オートモティブシステムズ株式会社 | ストロークシミュレータ |
WO2018233923A1 (de) * | 2017-06-20 | 2018-12-27 | Ipgate Ag | Bremssystem |
CN109229084A (zh) * | 2018-10-24 | 2019-01-18 | 苏州齐思智行汽车系统有限公司 | 电子液压制动系统及其制动缸 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017002770A1 (de) * | 2017-03-22 | 2018-09-27 | Lucas Automotive Gmbh | Pedalsimulationsvorrichtung mit mehreren Rückstellelementen |
DE102017220207A1 (de) * | 2017-11-14 | 2019-05-16 | Continental Teves Ag & Co. Ohg | Hydraulisches Aggregat zum Erzeugen von Bremsdruck für eine hydraulische Bremsanlage |
KR102227216B1 (ko) * | 2019-04-18 | 2021-03-12 | 현대모비스 주식회사 | 전자식 브레이크 장치 |
EP3828046A1 (en) * | 2019-11-29 | 2021-06-02 | MICO Inc. | A valve assembly and a system having a deadband state |
DE102019220355A1 (de) * | 2019-12-20 | 2021-06-24 | Robert Bosch Gesellschaft mit beschränkter Haftung | Hydraulische Fremdkraft-Fahrzeugbremsanlage und Verfahren zum Befüllen einer hydraulischen Fremdkraft-Fahrzeugbremsanlage |
DE102020212176A1 (de) * | 2020-09-28 | 2022-03-31 | Robert Bosch Gesellschaft mit beschränkter Haftung | Hydraulikblock für ein Hydraulikaggregat einer hydraulischen Fremdkraft-Fahrzeugbremsanlage |
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007176277A (ja) * | 2005-12-27 | 2007-07-12 | Hitachi Ltd | マスタシリンダ装置 |
JP2012106639A (ja) * | 2010-11-17 | 2012-06-07 | Honda Motor Co Ltd | 車両用ブレーキシステムの入力装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2246178A (en) * | 1990-07-17 | 1992-01-22 | Lucas Ind Plc | Hydraulic master cylinder |
KR100495757B1 (ko) | 2001-02-26 | 2005-06-16 | 가부시끼가이샤 히다치 세이사꾸쇼 | 마스터 실린더 |
US7159696B2 (en) * | 2003-11-21 | 2007-01-09 | Advics Co., Ltd. | Hydraulic braking pressure generating apparatus for vehicles |
WO2005108179A1 (en) | 2004-05-06 | 2005-11-17 | Kelsey-Hayes Company | Slip control boost braking system |
US9566968B2 (en) | 2010-11-17 | 2017-02-14 | Honda Motor Co., Ltd. | Input device of vehicle brake system |
DE102012205860A1 (de) * | 2011-04-19 | 2012-10-25 | Continental Teves Ag & Co. Ohg | Bremsanlage für Kraftfahrzeuge |
JP5927093B2 (ja) | 2012-09-21 | 2016-05-25 | 日立オートモティブシステムズ株式会社 | ブレーキ装置 |
JP5986594B2 (ja) | 2014-02-14 | 2016-09-06 | 株式会社フジクラ | 光デバイス |
-
2016
- 2016-07-25 US US15/746,436 patent/US10668909B2/en active Active
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Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007176277A (ja) * | 2005-12-27 | 2007-07-12 | Hitachi Ltd | マスタシリンダ装置 |
JP2012106639A (ja) * | 2010-11-17 | 2012-06-07 | Honda Motor Co Ltd | 車両用ブレーキシステムの入力装置 |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018020815A1 (ja) * | 2016-07-26 | 2018-02-01 | 日立オートモティブシステムズ株式会社 | ストロークシミュレータ |
WO2018233923A1 (de) * | 2017-06-20 | 2018-12-27 | Ipgate Ag | Bremssystem |
WO2018234387A1 (de) * | 2017-06-20 | 2018-12-27 | Ipgate Ag | Bremssystem |
GB2578399A (en) * | 2017-06-20 | 2020-05-06 | Ipgate Ag | Brake system |
GB2578399B (en) * | 2017-06-20 | 2022-09-14 | Ipgate Ag | Brake system |
US11472388B2 (en) | 2017-06-20 | 2022-10-18 | Ipgate Ag | Brake system |
US11981316B2 (en) | 2017-06-20 | 2024-05-14 | Ipgate Ag | Brake system |
US11987227B2 (en) | 2017-06-20 | 2024-05-21 | Ipgate Ag | Brake system |
CN109229084A (zh) * | 2018-10-24 | 2019-01-18 | 苏州齐思智行汽车系统有限公司 | 电子液压制动系统及其制动缸 |
CN109229084B (zh) * | 2018-10-24 | 2023-09-08 | 苏州齐思智行汽车系统有限公司 | 电子液压制动系统及其制动缸 |
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US10668909B2 (en) | 2020-06-02 |
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KR102138417B1 (ko) | 2020-07-27 |
US20180201247A1 (en) | 2018-07-19 |
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