Examples relate to a hydraulic control unit that includes a pump for increasing a hydraulic pressure of a brake fluid. The hydraulic control unit includes a discharge channel from which the brake fluid pressurized by a pump is discharged, a pulsation reducing unit disposed in the middle of the discharge channel, and a controller controlling the pump and the pulsation reducing unit. The pulsation reducing unit includes a valve housing, a fixed core fixed to the valve housing, a movable core received in the valve housing in an axially movable manner, a closing member interlocking with the movable core and closing the discharge channel, a coil disposed in a manner to surround the valve housing and the fixed core, and an inflow chamber formed by the valve housing and one end surface of the movable core, into which the brake fluid flows, and whose volume can vary.

Disclosed herein is a pulsation damping device of a hydraulic brake system. The pulsation damping device of a hydraulic brake system which attenuates a pressure pulsation of brake oil discharged from a pump, the device comprises a damping portion installed to be inserted into a bore in communication with an inport into which the brake oil flows and an outport through which the brake oil is discharged, and a cap coupled to one end of the bore to block the one end, wherein a flow path is formed on an outer circumferential surface of the damping portion to guide the brake oil introduced into the inport to be discharged through the outport, and the flow path is formed in a longitudinal direction of the damping portion to be continuously connected from the inport to the outport.

Disclosed herein is a hydraulic brake system. The hydraulic brake system comprises a damping device configured to attenuate pressure pulsation of brake oil discharged according to a driving of a pump, wherein the damping device includes a sleeve fixed to a bore that is connected to a discharge end of the pump and having an opened one side, a damping piston slidably installed inside the sleeve, and an elastic member provided inside the sleeve and configured to elastically support the damping piston, and wherein a slot having a width which is varied is formed at an inner circumferential surface of the sleeve in a direction in which the brake oil flows so that a variable orifice is formed between the damping piston and the sleeve.

A slip-controllable vehicle brake system includes a drivable pressure generator configured to supply at least one wheel brake of a brake circuit with pressure medium. The pressure generator has a pump inlet valve and a pump outlet valve to control the throughput of the pressure medium. Novel system functions, such as pedestrian protection, require that the pressure generator has a drive with increased power to provide high pressure medium volumes to the wheel brakes at a faster rate. In the case of ABS braking, a high braking pressure generated by the drive works against the starting of the pressure generator and increases the starting current. To ease the starting of the drive and to limit the required starting current, a mechanism is provided downstream of the pump outlet valve which prevents an exerting of the pressure generator on the pressure side with the pressure of the main brake cylinder.

Disclosed herein is a pulsation damping device of a hydraulic brake system. The pulsation damping device of a hydraulic brake system which attenuates a pressure pulsation of brake oil discharged from a pump comprise a sleeve inserted into a bore which communicates with an inport into which the brake oil is introduced and an outport through which the brake oil is discharged, wherein one end of the sleeve is open and the other end is closed, a damping member accommodated in the sleeve and hollowed to form a damping space therein, and a stopper member configured to block one open end of the bore and coupled to an opening of the sleeve.

The present invention relates to a pulsation reduction apparatus of a hydraulic piston pump, comprising: a block housing that has one end connected to the first hydraulic circuit and the other end connected to the second hydraulic circuit; a damper that is embedded in the block housing, absorbs pressure resulting from working fluid introduced to the first hydraulic circuit, assists with pressure increase of the second hydraulic circuit, and allows shape deformation; and viscosity damping units that are embedded in the block housing, are arranged between the first hydraulic circuit and the damper and between the second hydraulic circuit and the damper, and reduce viscosity of the working fluid introduced from the first and second hydraulic circuits, thereby reducing pressure pulsation and stably performing shock absorption and pressure increase at the same time with a relatively simple configuration.

A pressure change damper for a pressure side of a hydraulic pump of a hydraulic vehicle brake system with brake force control includes a valve assembly. The valve assembly is fitted in the pressure change damper and has a tubular valve that defines a lip of a damper element between the valve assembly and a damper housing pressed into the valve housing. The valve housing and a tubular valve seat part are produced by forming.

An electric brake system comprising: a master cylinder configured to a reservoir storing oil therein and configured to generate hydraulic pressure according to a pedal effort of a brake pedal; a cut valve installed at a backup flow path connecting the master cylinder to a wheel cylinder; a simulation device including a simulation chamber connected to the master cylinder at a front end of the cut valve to provide a reaction force according to the pedal effort of the brake pedal, a simulation valve provided at a flow path connecting the master cylinder to the simulation chamber; a hydraulic pressure supply device configured to operate in response to an electrical signal of a pedal displacement sensor sensing a displacement of the brake pedal, and a damping member provided at a flow path connecting the hydraulic pressure chamber to the front end of the cut valve, wherein the damping member delivers a pressure pulsation generated in the hydraulic pressure chamber to the brake pedal in an anti-lock brake system (ABS) mode.

A pulsation damper for damping pressure medium vibrations in a hydraulic system, has a membrane within a bore of a housing, which membrane is exposed to the pressure medium on its one side and faces a gas-filled cavity inside the housing on its other side, the bore of which is closed by means of a plug. The membrane, in conjunction with the plug and a hollow-cylindrical support body, forms an independently handleable, functionally pre-testable assembly, for which purpose the membrane is substantially cup-shaped, and the support body extends into it.

A hydraulic unit for a slip control system of a hydraulic vehicle brake system comprises a hydraulic block including a socket, a first port, a pressure change damper, and a second port. The socket has a base and defining a first interior. The first port is located at the base of the socket. The pressure change damper defines a second interior and is positioned in the socket in engagement with the first port. The first port is in fluidic communication with the second interior. The second port is in fluidic communication with the second interior via a portion of the first interior outside of the pressure change damper.