To acquire a hydraulic pressure control unit and a straddle-type vehicle brake system capable of adding an auxiliary plunger pump while suppressing extreme enlargement of the hydraulic pressure control unit.

In a base body, a combination of a first plunger pump and a first accumulator and a combination of a second plunger pump and a second accumulator for a different system of a hydraulic circuit therefrom are separately provided on both sides of a reference surface including a center axis of a motor hole. A first plunger pump hole and a second plunger pump hole are separately provided on a second surface and a third surface constituting both ends of the base body in a first direction. A first accumulator hole, a second accumulator hole, and an auxiliary plunger pump hole are provided on a fourth surface constituting an end of the base body in a second direction.

A hydraulic block for a hydraulic assembly of a slip control system of a hydraulic vehicle brake system includes a metal-plastic composite part with a metal part and a further part. The metal part includes sleeve-like brake line ports, sleeve-like valve receptacles, sleeve-like pump receptacles, and pipes as connecting lines. The further part is a plastic part that is injection-molded around the metal part to form the hydraulic block in a cuboid shape.

The disclosure relates to an actuating system for a vehicle brake, with an actuating arrangement, in particular a brake pedal, at least one (first) piston-cylinder unit, which is connected via a hydraulic line to the vehicle brake (braking circuit) in order to supply the braking circuit with pressure medium and apply pressure to the vehicle brake, and with a drive for the piston-cylinder unit. Pressure medium can be fed to the braking circuit in controlled manner in both piston movement directions, in particular the advance stroke and the return stroke, by means of at least one, in particular stepped, piston of the piston-cylinder unit.

In a pump arrangement for a hydraulic unit of a vehicle brake system having a pump housing and a pump piston which is guided so as to be displaceable axially back and forth in the pump housing, a damping element is provided radially between the pump piston and the pump housing. The damping element damps vibrations of the pump piston which occur during an operation of the pump arrangement.

A first valve module (4000) includes a valve block and circuits for controlling hydraulic pressure to parking brake and differential lock actuation circuits of a vehicle. An extension flowpath (4010) has an extension inlet and outlet opening respectively through an interface surface and further external surface of the valve block. A second module (1000) may be connected to supply a first service brake circuit, the circuits of the first module, and, via a second service brake outlet communicating with the extension inlet, a second service brake circuit. In a method, first and second valve blocks with internal flowpaths formed respectively by machining and by casting are assembled together with valves to define valve modules (4000, 1000) having respective, first and second functional circuits. The first valve block includes an extension flowpath. The second module supplies pressure to the first functional circuit and the extension flowpath of the first module.

A piston pump, in particular as a pressure generator in an electronically slip-controllable vehicle brake system, includes a pump cylinder, a drivable piston, a pump working chamber, a valve space, and a valve. The drivable piston is slidably accommodated in the pump cylinder. The pump working chamber is bounded by the piston and the pump cylinder. The valve controls a supply of pressure medium to the pump working chamber. The valve has a conical valve seat and a closing element having a domed shell section that interacts with the valve seat. The valve seat surrounds the valve space, into which the closing element plunges, at least up to an imaginary center point of the domed shell section, when the valve seat is closed or open.

The disclosure relates to an actuating system for a vehicle brake, with an actuating arrangement, in particular a brake pedal, at least one (first) piston-cylinder unit, which is connected via a hydraulic line to the vehicle brake (braking circuit) in order to supply the braking circuit with pressure medium and apply pressure to the vehicle brake, and with a drive for the piston-cylinder unit. Pressure medium can be fed to the braking circuit in controlled manner in both piston movement directions, in particular the advance stroke and the return stroke, by means of at least one, in particular stepped, piston of the piston-cylinder unit.

Provided is a plunger pump where quietness can be ensured. A plunger pump includes a cylinder, a piston, a discharge valve, and a plug member. The plug member includes: a recessed portion formed on a circumferential wall of a discharge chamber opposing an outer periphery of the discharge valve in a radial direction; and a discharge passage disposed at a position different from the recessed portion, formed on the circumferential wall of the discharge chamber opposing the outer periphery of the discharge valve in the radial direction, and connecting the discharge chamber and the outside with each other.

A vehicle brake system includes a first main cylinder with a first main cylinder connection and a first actuating device with a first actuating connection. The first main cylinder connection is in flow-connection to the first actuating connection, and the first actuating device is operable with the first main cylinder. A first brake circuit is provided between a pump and a first wheel cylinder, where the pump in the first brake circuit is operable to generate pressure and move a fluid within the first brake circuit. A first valve device is provided in the first brake circuit where the first valve device is movable between a first configuration in which a flow connection is produced between the pump and the first wheel cylinder, and a second configuration in which a flow connection between the pump and the first wheel cylinder is prevented.

[Problem] A brake hydraulic pressure controller capable of being formed with a relatively large damper chamber while suppressing enlargement of a housing is provided.

[Means for Resolution] The brake hydraulic pressure controller includes: a motor having a motor shaft; a skew plate fixed to a tip of the motor shaft and arranged to be inclined with respect to an axial direction of the motor shaft; and a pump element driven by rotation of the motor shaft and the skew plate. The pump element has: a piston that reciprocates in parallel with the axial direction of the motor shaft in conjunction with the rotation of the skew plate; an accommodation chamber that accommodates a part of the piston and to which a brake fluid is introduced; a release valve that releases the brake fluid from the accommodation chamber; and a pressure damper chamber that is provided in a reciprocal direction of the piston and into which the brake fluid released from the release valve flows.