A hydraulic block of a slip regulation of a hydraulic vehicle power brake system that has a master brake cylinder bore and forms a master brake cylinder. In order to prevent a hard impact of a piston of the master brake cylinder against an end stop when the master brake cylinder is released, in particular when there is an abrupt release, for example when the foot slides off a foot brake pedal, a hydraulic return damper that is integrated in the piston is provided.

A braking apparatus of a vehicle may include: a first master cylinder configured to create hydraulic pressure as a brake pedal is pressed; a second master cylinder configured to create braking pressure through a piston which is pressed by the hydraulic pressure created by the first master cylinder and a nut moved by rotation of a motor; and a control unit, configured to: calculate a required displacement position of the nut based on a pedal stroke of the brake pedal, and update the required displacement position based on a displacement position of the nut at a dead stroke end point where the pedal stroke moves away from a dead stroke section of the first master cylinder.

An integrated electric booster braking system with a pedal force compensation function, comprising a booster motor, a first gear, a second gear, a lead screw, a brake master cylinder, a pedal push rod, a master cylinder push rod, a fluid storage tank, a hydraulic control unit and an electric control unit, wherein first gear and second gear are assembled in a housing, first gear is engaged with the second gear, the booster motor is connected with the first gear and drives the first gear to rotate, the first gear drives the second gear to rotate during rotation, the second gear is in threaded connection with the lead screw, the second gear drives the lead screw to move during rotation, the lead screw is of a hollow structure, and the rear end of the lead screw is abutted with the front end of a first piston in the brake master cylinder.

A brake system may include an actuating device, in particular a brake pedal; a first piston-cylinder unit having two pistons subjecting the brake circuits to a pressure medium via a valve device, wherein one of the pistons can be actuated by the actuation device; a second piston-cylinder unit having an electric motor drive, a transmission at least one piston to supply at least one of the brake circuits with a pressure medium via a valve device; and a motor pump unit with a valve device to supply the brake circuits with a pressure medium. The brake system may also include a hydraulic travel simulator with a pressure or working chamber which is connected to the first piston-cylinder unit.

The present invention includes: a normal control unit that performs, on the basis of a target master pressure and an actual-master-pressure correlation value correlated with an actual master pressure value, pressure increasing control, which is control to increase the master pressure, maintaining control, which is control to maintain the master pressure, or pressure reducing control, which is control to reduce the master pressure; a drive suppression unit that performs drive suppression control to suppress driving of master pistons when the actual-master-pressure correlation value approaches the target master pressure while the normal control unit is performing the pressure increasing control or the pressure reducing control; and a suppression-level setting unit that is configured to include wheel cylinders and that sets a suppression level for drive suppression control on the basis of the rigidity of a downstream part, which is closer to the wheel cylinders than master chambers.

A control device for a vehicle hydraulic braking system, including an electronic device for transferring brake fluid into at least one wheel brake cylinder without a force transmission connection to the brake actuating element, or that is hydraulically decoupleable from the brake actuating element, with a motorized brake pressure buildup device; ascertaining whether wheel locking of at least one wheel of the vehicle that is braked with the at least one wheel brake cylinder is present or at risk; temporarily effectuating, at least at times, a counterforce on the brake actuating element acting against the actuation of the brake actuating element by the driver when it is ascertained that wheel locking is present or at risk and/or when the electronic brake force distribution function and/or the antilocking function are/is executed. Also described is a hydraulic braking system for a vehicle, and a method for operating such a braking system.

Provided is a vehicular brake apparatus capable of suppressing the occurrence of pedal shock. In this vehicular brake apparatus, a master cylinder forms a second hydraulic chamber neighboring to a first hydraulic chamber through a seal member. The seal member is arranged at a position facing the first hydraulic chamber and the second hydraulic chamber to be movable in the axial direction relative to the master cylinder. A first hydraulic pressure generating portion executes a movement restriction hydraulic pressure control such that when the operation information obtained by the operation information obtaining portion indicates that the brake operating member is not operated, the first hydraulic pressure which is higher than the second hydraulic pressure is generated in advance and consecutively, the larger a value relating to an operating amount in the operation information obtained by the operation information obtaining portion, the higher the first hydraulic pressure is generated.

The hydraulic pressure control device has an idle region, and is provided with a control portion, and a correcting portion which, in cases when the reaction time of the actual pressure to pressure increasing control or pressure decreasing control exceeds a predetermined threshold time, corrects a control current towards the side in which the flow-rate is increased. In cases when a judging portion has judged that the pressure increasing control is in the idle area, the correcting portion applies, as the threshold time, an idle threshold time set to a value different from the threshold time that in cases when the judging portion has not judged that the pressure increasing control is in the idle area. Furthermore, in cases when the reaction time of the actual pressure to the pressure increasing control exceeds the idle threshold time, the correcting portion corrects the control current.

An actuating device for a motor vehicle brake may include an actuating apparatus, such as a brake pedal; a pressure-supply device, such as a single- or double-stroke piston pump, which may be driven by an electromotive drive; a piston-cylinder unit actuable by the actuating apparatus, hydraulically connected to a pressure medium reservoir, and forming at least two pressure spaces connected to hydraulic brake circuits; a valve arrangement having valves for wheel-specific adjustment of brake pressures and for connecting/disconnecting the wheel brakes to/from the pressure-supply device and/or the piston-cylinder unit; and an electronic control unit. An axis of the piston-cylinder unit and an axis of the piston pump may be arranged transversely with respect to each other. The piston-cylinder unit and the pressure supply unit may be arranged in a first housing, and the electromotive drive, the first housing, the valve arrangement, and the electronic control unit may be stacked.

A hydraulic device for controlling braking for farm tractors, earthmovers and like machines, comprises a master cylinder and brake booster. A piston of the brake booster defines first and second chambers which, under rest conditions, are in communication and, during braking, are cut off with the first chamber being put in communication with a discharge chamber of the master cylinder. The piston of the master cylinder is driven by a drive piston shaped to define with a plunger of the piston of the brake booster a hollow space through which the first chamber communicates with either the second chamber or the discharge chamber, depending on device operating conditions. In the plunger, a seat for a gasket-valve is arranged to cooperate with the drive piston, during braking, to prevent fluid leakage between the second and the first chamber as a consequence of the sliding of the drive piston caused by braking.