Abstract: A vehicle braking device includes a first supply device that supplies brake fluid to wheel cylinders, a first supply path that connects the first supply device and the wheel cylinders, and first and second electromagnetic valves provided on the first supply path. The first electromagnetic valve is disposed on the first supply path such that a seating direction of the first electromagnetic valve and a brake fluid supply direction are opposite each other, the seating direction is a direction in which a valve body is seated on a valve seat, and the brake fluid supply direction is a direction in which the brake fluid flows from the first supply device to the wheel cylinders through the first supply path. The second electromagnetic valve is disposed on the first supply path such that a seating direction of the second electromagnetic valve and the brake fluid supply direction are the same.

Abstract: A braking control device includes an “electrically driven pressure control unit YC”, “front-wheel and rear-wheel supply paths HKf and HKr that supply a brake fluid BF pressurized by the pressure control unit YC to front-wheel and rear-wheel wheel cylinders CWf and CWr”, “front-wheel and rear-wheel supply valves VKf and VKr provided in the front-wheel and rear-wheel supply paths HKf and HKr”, and a “controller ECU that drives the pressure control unit YC and the front-wheel and rear-wheel supply valves VKf and VKr”. In the braking control device, at least one of the front-wheel and rear-wheel supply valves VKf and VKr is a linear valve.

Abstract: In an electric parking brake device, the force line of a motion transmitting force at a contact portion between a motion transmitting member and an intervention member is located inside of an outer surface of an engaging portion between a screw shaft member and a nut member. Thus, when a linear motion of the screw shaft member causes the parking lever to pivotally move, no floating takes place at the engaging portion, so that a one-side hitting can be prevented at the engaging portion. Therefore, the parking lever can be pivotally moved smoothly. Further, one surface of the motion transmitting member contacting the intervention member takes a curved surface to suppress a slippage in the movement that the parking lever is pivotally moved. Therefore, the motion transmitting force by the motion transmitting member can be prevented from becoming an offset load, realizing a smooth pivot movement of the parking lever.

Abstract: In a liquid pump for a braking system of a vehicle, one end of a piston is slidably inserted into a cylindrical space of a housing member, and a sliding ring is provided on the piston. A suction chamber is formed by an inner peripheral surface of the housing member, an outer peripheral surface of the piston and the sliding ring. An inner diameter “Dk” of the housing member is made larger than an inner diameter “Dc” of the cylindrical space. As a result, the volume of the suction chamber is increased, without making the piston smaller in its diameter.

Abstract: When a stroke of a manually operated braking member is equal to or smaller than a predetermined stroke, a master pressure chamber of a master cylinder is communicated with an atmospheric pressure reservoir, and an electromagnetic valve and a hydraulic pressure pump are controlled to supply the hydraulic pressure to wheel brake cylinders according to an amount of operation of the manually operated braking member detected by a braking operation detection device. An orifice is provided in a passage between the master pressure chamber and the atmospheric pressure reservoir, and a check valve is disposed in parallel with the electromagnetic valve to allow a flow of the brake fluid from the master cylinder to the wheel brake cylinders, and prohibit its reverse flow.

Abstract: A hydraulic brake device includes a hydraulic pressure supply passage for reducing the output hydraulic pressure by a first proportional solenoid valve and supplying it to a hydraulic passage leading from a pressure adjusting valve to the wheel cylinders, a second proportional solenoid valve disposed between the hydraulic pressure supply passage and the pressure adjusting valve for reducing the hydraulic pressure supplied from the hydraulic pressure supply passage, and a check valve parallel to the second proportional solenoid valve. Hydraulic pressure control during automatic brake control is carried out by the first and second proportional solenoid valves.

Abstract: In a brake hydraulic pressure generating device in which the brake operating force is applied to a pressure adjusting valve through a stroke simulator and the hydraulic pressure supplied from the hydraulic pressure source is adjusted to a value corresponding to the brake operating force, during return of the brakes, the return stroke before the brake hydraulic pressure begins to drop is large, so that the brake feeling is bad. This invention proposes a solution to this problem. Hysteresis is imparted to the stroke simulator so that the output hydraulic pressure of the pressure adjusting valve for the stroke of the simulator piston stroke during increase of the brake operating force will be higher than that during reduction of the brake operating force by setting the sliding resistance of the simulator piston greater than that of the input piston.

Abstract: The present invention is directed to a braking stroke simulator for use in a brake system, which comprises a simulator piston moved in response to operation of a manually operated braking member, and an elastic element for providing a stroke to the simulator piston in response to braking operation force applied to the manually operated braking member, wherein restoring amount of the elastic element is restricted to set an initial load to be applied thereto. The elastic element includes a first elastic member made of rubber, and a second elastic member made of a helical spring, which is disposed in series with the first elastic member. The initial load applied to the first elastic member and the initial load applied to the second elastic member are set to be substantially equal to each other.

Abstract: In a liquid pump for a braking system of a vehicle, one end of a piston is slidably inserted into a cylindrical space of a housing member, and a sliding ring is provided on the piston. A suction chamber is formed by an inner peripheral surface of the housing member, an outer peripheral surface of the piston and the sliding ring. An inner diameter “Dk” of the housing member is made larger than an inner diameter “Dc” of the cylindrical space. As a result, the volume of the suction chamber is increased, without making the piston smaller in its diameter.

Abstract: A pressure generating apparatus includes a first piston moved in response to operation of a brake pedal, an elastic member for providing a stroke of the first piston in response to braking operation force of the brake pedal, a second piston accommodated in a housing for defining a master chamber in front of it and a simulator chamber behind it, and an atmospheric pressure reservoir for storing brake fluid. A changeover device is provided for selectively communicating the simulator chamber with the reservoir, or blocking the communication between them. And, a stroke restriction device is provided for restricting a maximal stroke of the first piston relative to the housing to be smaller than the sum of a maximal stroke of the second piston relative to the housing and a maximal stroke of the first piston relative to the second piston.

Abstract: When a stroke of a manually operated braking member is equal to or smaller than a predetermined stroke, a master pressure chamber of a master cylinder is communicated with an atmospheric pressure reservoir, and an electromagnetic valve and a hydraulic pressure pump are controlled to supply the hydraulic pressure to wheel brake cylinders according to an amount of operation of the manually operated braking member detected by a braking operation detection device. An orifice is provided in a passage between the master pressure chamber and the atmospheric pressure reservoir, and a check valve is disposed in parallel with the electromagnetic valve to allow a flow of the brake fluid from the master cylinder to the wheel brake cylinders, and prohibit its reverse flow.

Abstract: The present invention is directed to a master cylinder having a braking stroke simulator, wherein a master piston is slidably accommodated in a housing having an atmospheric pressure chamber and a master pressure chamber, and a simulator piston is slidably accommodated in the housing to define a simulator chamber. An elastic member is provided for applying a stroke of the simulator piston in response to braking operation force applied to a manually operated braking member. Thus, the braking stroke simulator transmits the braking operation force to the master piston through the simulator piston and elastic member. A cut-off seal member is disposed in the housing for supporting the master piston, and placed to be applied with the pressure in the master pressure chamber in front of it and applied with the atmospheric pressure behind it. And, a passage is formed in the master piston to communicate the simulator chamber with the atmospheric pressure chamber when the master piston is placed in its initial position.

Abstract: A hydraulic braking pressure generating apparatus for a vehicle includes a hydraulic pressure generator for generating a predetermined hydraulic pressure irrespective of a braking operation of a brake operation member and for outputting the predetermined hydraulic pressure, an input member moved in response to the brake operation member, a first elastic member for transmitting a brake operation force applied to the input member and for applying a stroke corresponding to the brake operation force to the input member, a regulation valve connecting to the first elastic member and for regulating the outputted hydraulic pressure of the hydraulic pressure generator in response to the brake operation force transmitted through the first elastic member and for outputting a regulated hydraulic pressure and a second elastic member connecting the regulation valve and for urging the regulation valve toward its initial position.

Abstract: A pressure generating apparatus includes a master cylinder, a stroke simulator and a communication control device, which includes a seal member disposed in a cylinder housing, and a communication passage formed on a part of outer periphery of a second master piston. When the second master piston is placed in the initial position thereof, a first master chamber is communicated with the stroke simulator through the communication passage. When the second master piston is advanced from the initial position by the predetermined distance or more, the communication passage is separated from the first master chamber by the seal member, to block the communication between the first master chamber and the stroke simulator.

Abstract: A pressure generating apparatus includes a master cylinder and a stroke simulator which has a pressure chamber communicated with a first master chamber, an atmospheric chamber communicated with a reservoir, and a piston member urged by a resilient member, and which absorbs brake fluid in response to the hydraulic pressure discharged from the first master chamber, to provide a stroke for a first master piston. The atmospheric chamber of the simulator is communicated with the reservoir when a second master piston member is placed in an initial position thereof, and blocks the communication between them, when the second master piston is advanced by a predetermined distance or more from the initial position.

Abstract: The present invention is directed to a hydraulic brake apparatus provided with a pressure source for generating hydraulic pressure, a hydraulic pressure boosting device having a pressure regulating valve for regulating the hydraulic pressure generated by the pressure source in response to braking operation by a vehicle driver, a master cylinder for advancing a master piston by the hydraulic pressure discharged from the hydraulic pressure boosting device, and a wheel brake cylinder operatively mounted on each wheel of the vehicle.

Abstract: A piston member is slidably accommodated in a cylinder bore for defining a master pressure chamber. A simulator piston is provided for defining a simulator chamber and moving in response to operation of a brake pedal. An annular groove is formed on the inner surface of the cylinder bore with a certain width along a longitudinal axis of the cylinder bore, and a seal member is mounted around the piston member. The simulator chamber is communicated with the atmospheric pressure chamber through a clearance between the seal member and the annular groove, when the piston member is placed in the initial position thereof, whereas the communication between the simulator chamber and the atmospheric pressure chamber is blocked, with the seal member being placed to contact the inner surface of the cylinder bore, when the auxiliary piston is advanced from the initial position thereof by the predetermined distance or more.

Abstract: A pressure generating apparatus includes a first piston moved in response to operation of a brake pedal, an elastic member for providing a stroke of the first piston in response to braking operation force of the brake pedal, a second piston accommodated in a housing for defining a master chamber in front of it and a simulator chamber at the back of it, and an atmospheric pressure reservoir for storing brake fluid. A changeover device is provided for selectively communicating the simulator chamber with the reservoir, or blocking the communication between them. And, a stroke restriction device is provided for restricting a maximal stroke of the first piston relative to the housing to be smaller than the sum of a maximal stroke of the second piston relative to the housing and a maximal stroke of the first piston relative to the second piston.

Abstract: A piston member is slidably accommodated in a housing for defining a master pressure chamber. A simulator piston is provided for defining a simulator chamber and moving in response to operation of a brake pedal. The simulator chamber is communicated with an atmospheric pressure chamber when the piston member is placed in an initial position thereof, and the communication between the master chamber and the atmospheric pressure chamber is blocked when the piston member is advanced from the initial position thereof by a first stroke or more. Furthermore, the communication between the simulator chamber and the atmospheric pressure chamber is blocked when the piston member is advanced from the initial position by a second stroke, which is set to be greater than the first stroke, or more. And, a blocking member is provided for restricting the simulator piston to be retracted up to a position thereof which is placed relative to the piston member when the brake pedal is inoperative.

Abstract: A braking pressure generating apparatus for a vehicle includes a hydraulic pressure generator for generating and outputting a power pressure irrespective of an operation of a brake pedal, and an input member connected with the brake pedal. A regulation valve is disposed coaxially with the input member to regulate the power pressure outputted from the hydraulic pressure generator to a predetermined pressure corresponding to the braking operation force of the brake pedal and output the predetermined pressure. The regulation valve includes a body and a valve portion movably disposed in the body. A force distribution device is disposed between the input member and the regulation valve to the distribute braking operation force applied to the input member the valve portion and the body of the regulation valve.