Abstract: A hydraulic brake apparatus for a vehicle includes a brake operating member, a hydraulic pressure generating source, a regulating valve, a master cylinder having first and second pistons, a pressure detecting means connected to a second pressure chamber for detecting a brake hydraulic pressure outputted from the second pressure chamber, a brake operating amount detecting means for detecting an operating amount of the brake operating member, and a judging means for judging a hydraulic pressure condition of first and second hydraulic systems respectively connected to first and second chambers based upon the brake hydraulic pressure detected by the pressure detecting means relative to the operating amount of the brake operating member detected by the brake operating amount detecting means.

Abstract: A hydraulic brake apparatus for a vehicle includes a hydraulic pressure generator which generates and outputs a power pressure irrespective of brake pedal operation, a regulation valve which regulates the power pressure to a predetermined pressure corresponding to the brake pedal operation force and outputs the predetermined pressure, and a master cylinder having a master cylinder pressure chamber and an auxiliary pressure chamber connectable to an output side of the regulation valve. The master cylinder is operated by auxiliary pressure in the auxiliary pressure chamber to generate a master cylinder pressure corresponding to the auxiliary pressure. A wheel brake cylinder is operated by the master cylinder pressure to apply braking force to a wheel. A pressure modulation device is disposed in a pressure passage connecting the output side of the regulation valve to the auxiliary pressure chamber to modulate the auxiliary pressure to a pressure less than the predetermined.

Abstract: A master cylinder includes a cylinder housing having a cylinder bore, a seal cup disposed inside the cylinder bore, and a piston slidably disposed in the cylinder bore in sliding contact with the seal cup and defining a pressure chamber in cooperation with the housing and the seal cup. The piston includes a connecting passage which fluidly connects the pressure chamber with an atmospheric pressure chamber when the piston is in a retracted position. The seal cup cuts off fluid communication between the pressure chamber and the atmospheric pressure chamber through the connecting passage when the piston moves in its axial direction by a prescribed distance from its retracted position. The connecting passage is a stepped hole having a first end portion with a small diameter which communicates with the pressure chamber and a second end portion with a large diameter which opens onto an outer peripheral surface of the piston.

Abstract: With a brake hydraulic pressure generator in which the brake operating force is applied to a pressure adjusting valve through a stroke simulator and hydraulic pressure supplied from the hydraulic pressure source is adjusted to a value corresponding to the brake operating force by the pressure adjusting valve, at the relaxing of the brake operating force, the return stroke until the output hydraulic pressure of the pressure adjusting valve begins to drop is large. Thus a delay in the decrease of an output hydraulic pressure occurs. This worsens brake feeling. To solve this problem, the sliding resistance of the simulator piston is set to be greater than that of the input piston so that at the relaxing of the brake operating force, the input piston moves relative to the pressure adjusting valve before the simulator piston moves relative to the input piston. This quickens response of an output hydraulic pressure drop relative to the relaxing of the brake operating force.

Abstract: It is proposed to improve the operating feeling of a vehicle brake hydraulic pressure generator in which the hydraulic pressure supplied from a hydraulic pressure source is adjusted to a value corresponding to the brake operating force by means of a pressure adjusting valve which changes its operating state according to displacement of an input piston or a simulator piston. A simulator chamber in the piston into which the simulator piston protrudes is connected to an atmospheric reservoir through an orifice to restrict the flow of brake fluid out of the simulator chamber while the brake is operated sharply, ther by delaying the stroke of a brake pedal.

Abstract: A brake control device for a vehicle includes a master cylinder generating a master cylinder hydraulic pressure in response to a brake pedal depressing force, a wheel cylinder connected with the master cylinder via a hydraulic conduit, a stroke simulator connected to a branch hydraulic conduit branching from the hydraulic conduit, a first solenoid valve connecting or disconnecting the master cylinder with the wheel cylinder and disposed at the hydraulic conduit between a branch portion where the branch hydraulic conduit branches from the hydraulic conduit and the wheel cylinder, a second solenoid valve connecting or disconnecting the master cylinder with the stroke simulator, a pressure controlling mechanism having a pressure source and connected at a portion of the hydraulic circuit between the first solenoid valve and the wheel cylinder, and a controller for controlling the pressure controlling mechanism, the first solenoid valve and the second solenoid valve.

Abstract: A hydraulic brake device for applying a braking force to a wheel of a vehicle which can detect an air-containing in a hydraulic circuit. The hydraulic brake device includes a hydraulic pressure generating device for generating and outputting a hydraulic pressure in accordance with a brake operational amount, a wheel cylinder operated by the hydraulic pressure directly or indirectly supplied from the hydraulic pressure generating device for applying a braking force to a vehicle wheel, a brake operational amount detection device for detecting the brake operational amount, a pressure sensor for detecting an output hydraulic pressure outputted from the hydraulic pressure generating device, and a controller for detecting an air-containing in a hydraulic circuit by a response time relating to a rise of the output hydraulic pressure detected by the pressure sensor relative to a start of a rise of the brake operation amount detected by the brake operational amount detection device.

Abstract: A vehicle hydraulic brake apparatus includes a hydraulic pressure generator which generates a power pressure irrespective of operation of a brake pedal and a regulation valve which regulates the power pressure to a predetermined pressure corresponding to an operation force of the brake pedal and outputs it to an output chamber. A master cylinder generates a master cylinder pressure in a master cylinder chamber by forward movement of the master cylinder piston and a wheel brake cylinder is operated by the master cylinder pressure to apply braking force to a vehicle wheel. An auxiliary piston is located backward the master cylinder piston to define an auxiliary pressure chamber between the master cylinder piston and the auxiliary piston and to move the master cylinder piston forward by an auxiliary pressure in the auxiliary pressure chamber. A pressure modulating device decreases the predetermined pressure outputted from the output chamber to supply the auxiliary pressure to the auxiliary pressure chamber.

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 hydraulic brake apparatus for a vehicle includes a brake operating member, a hydraulic pressure generating source, a regulating valve, a master cylinder having first and second pistons, a pressure detecting means connected to a second pressure chamber for detecting a brake hydraulic pressure outputted from the second pressure chamber, a brake operating amount detecting means for detecting an operating amount of the brake operating member, and a judging means for judging a hydraulic pressure condition of first and second hydraulic systems respectively connected to first and second chambers based upon the brake hydraulic pressure detected by the pressure detecting means relative to the operating amount of the brake operating member detected by the brake operating amount detecting means.

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.

Abstract: A brake stroke simulator includes a first movable member freely slidably disposed in a housing and defining a hydraulic pressure chamber at one end of the first movable member that is adapted to be supplied with hydraulic pressure corresponding to braking operation of a brake pedal, and a second movable member disposed at the other end of the first movable member in the housing movable integrally with the first movable member. A first spring biases the first movable member and a second spring biases the second movable member. A shock absorbing elastic member is compressed by the sliding movement of the first movable member against the biasing force of the first spring and is compressed by the sliding movement of the second movable member against the biasing force of the second piston.

Abstract: A hydraulic brake apparatus for a vehicle includes a hydraulic pressure generator which generates and outputs a power pressure irrespective of brake pedal operation, a regulation valve which regulates the power pressure to a predetermined pressure corresponding to the brake pedal operation force and outputs the predetermined pressure, and a master cylinder having a master cylinder pressure chamber and an auxiliary pressure chamber connectable to an output side of the regulation valve. The master cylinder is operated by auxiliary pressure in the auxiliary pressure chamber to generate a master cylinder pressure corresponding to the auxiliary pressure. A wheel brake cylinder is operated by the master cylinder pressure to apply braking force to a wheel. A pressure modulation device is disposed in a pressure passage connecting the output side of the regulation valve to the auxiliary pressure chamber to modulate the auxiliary pressure to a pressure less than the predetermined.

Abstract: A brake control device for a vehicle includes a master cylinder generating a master cylinder hydraulic pressure in response to a brake pedal depressing force, a wheel cylinder connected with the master cylinder via a hydraulic conduit, a stroke simulator connected to a branch hydraulic conduit branching from the hydraulic conduit, a first solenoid valve connecting or disconnecting the master cylinder with the wheel cylinder and disposed at the hydraulic conduit between a branch portion where the branch hydraulic conduit branches from the hydraulic conduit and the wheel cylinder, a second solenoid valve connecting or disconnecting the master cylinder with the stroke simulator, a pressure controlling mechanism having a pressure source and connected at a portion of the hydraulic circuit between the first solenoid valve and the wheel cylinder, and a controller for controlling the pressure controlling mechanism, the first solenoid valve and the second solenoid valve.

Abstract: A brake control device for a vehicle includes a master cylinder, a wheel cylinder, a brake pedal behavior simulator, a normally-open type electromagnetic valve, a normally-closed type electromagnetic valve, and a brake pressure control device. The brake pressure control device includes a pump, a reservoir, and two electromagnetic valves to increase and decrease wheel cylinder hydraulic pressure. When the brake pressure control device is normally operated, a hydraulic pressure in the wheel cylinder is controlled by the brake pressure control device. On the other hand, when the brake pressure control device malfunctions or is abnormally operating, the wheel cylinder hydraulic pressure is controlled by hydraulic pressure generated from the master cylinder. At least the normally-closed type electromagnetic valve is opened when the brake pedal is in the non-operational state.

Abstract: A vehicle brake apparatus includes a brake pedal, a wheel brake cylinder operatively mounted on a wheel for applying a braking force to the wheel in proportion to a hydraulic braking pressure, a pressure source for pressurizing brake fluid to generate a hydraulic braking pressure and supply the hydraulic braking pressure to the wheel brake cylinder, and an auxiliary pressure source for pressurizing brake fluid in response to operation of the brake pedal to generate a hydraulic braking pressure and supply the hydraulic braking pressure to the wheel brake cylinder when the pressure source is non-operational. A mechanical valve is operatively mounted between the wheel brake cylinder and the auxiliary pressure source. A first passage is connected between the auxiliary pressure source and the mechanical valve and a second passage is connected between the mechanical valve and the wheel brake cylinder.

Abstract: A brake control apparatus is provided with a simulator for applying a biasing force to a manually operated braking member of a vehicle in response to braking operation. A sensor detects conditions of the vehicle including a braking condition of the vehicle. A first biasing device applies a first biasing force to the manually operated braking member in response to braking operation, and a second biasing device applies a second biasing force, as well. Only one of the first and second biasing devices applies the biasing force to the manually operated braking member when a predetermined condition is detected by the sensor, while both of the first and second biasing devices apply the biasing forces in the normal braking operation.

Abstract: To apply hydraulic pressure to a wheel brake upon failure of a stroke simulator, a brake pressure control device for automotive vehicles is designed so that when a power pressure source is in the normal condition, fluid communication between the master cylinder and the wheel brake is interrupted and fluid communication between the master cylinder and the stroke simulator is established, thus causing the output hydraulic pressure of the power pressure source to be adjusted in response to a detection output of a master cylinder hydraulic pressure sensor, thereby applying the resulting hydraulic pressure to the wheel brake. In addition, the brake pressure control device is provided with a stroke sensor which detects a stroke of a brake pedal. When the stroke of the brake pedal exceeds a predetermined stroke, a simulator cut-off valve is closed to interrupt fluid communication between the master cylinder and the stroke simulator.

Abstract: The present invention is directed to a vehicle braking system having a stroke simulator and a servo device, which includes a pressure generator for generating a hydraulic braking pressure, a wheel brake cylinder operatively mounted on each wheel of the vehicle, a pressure control valve device which is disposed in a passage for communicating the pressure generator with the wheel brake cylinder, to control the hydraulic braking pressure supplied to the wheel brake cylinder, and an electronic controller for controlling at least in response to an amount of operation of the brake pedal. A master cylinder is provided for communicating with the wheel brake cylinder and supplying the hydraulic braking pressure into it in response to operation of the brake pedal, when at least one of the pressure generator, the pressure control valve device and the electronic controller is abnormal.

Abstract: A load transmitting elastic member is interposed between an input rod and a piston of a master cylinder or a piston of a pedal stroke simulator to which the operation force of a brake pedal is applied from the input rod. The set load of the load transmitting elastic member is lower than the predetermined load required for causing the piston to begin to slide and the maximum load of the load transmitting elastic member is higher than the predetermined load required for causing the piston to begin to slide. The stroke of the brake pedal thus begins through application of a small depression force applied to the brake pedal and so the operational feeling of the brake pedal is improved.