A device for maintaining a hydraulic supply of a utility vehicle includes a hydraulic pump, which is adjustable in terms of its delivery volume via a pressure control inlet, for feeding hydraulic fluid to a hydraulic circuit, a pressure accumulator that can be charged from the hydraulic circuit via a check valve, a pressure connection between the hydraulic circuit and the pressure control inlet of the hydraulic pump being producible via a sensor line by means of a charging valve, and a supply connection between the pressure accumulator and the hydraulic circuit being producible by means of a discharging valve, by virtue of the check valve being bypassed.

A brake system includes a source of pressurized hydraulic fluid, a plurality of wheel brakes, and an iso/dump control valve arrangement associated with at least one wheel brake. A reservoir is connected to the source of pressurized fluid and to the iso/dump control valve arrangement. A fast-replenishing circuit includes a FR iso valve, a venting valve, and a replenishing check valve. The venting and replenishing check valves are interposed between the source of pressurized fluid and the reservoir. The FR iso valve is interposed between the source of pressurized fluid and the iso/dump control valve arrangement. When the source of pressurized fluid reaches a predetermined stroke position, the FR iso valve is energized to restrict movement of fluid from at least one iso/dump control valve arrangement to the source of pressurized fluid. The source of pressurized fluid is re-stroked to draw fluid from the reservoir through the replenishing check valve.

A tandem power transmission unit includes a ball screw and a ball nut selectively driven by the ball screw for longitudinal motion relative thereto. A primary piston is operatively coupled to the ball nut. A secondary piston is operatively coupled to the primary piston. A primary chamber is configured to contain hydraulic fluid and is selectively pressurized by reciprocal motion of the primary piston. A secondary chamber is configured to contain hydraulic fluid and is selectively pressurized by reciprocal motion of the secondary piston driven indirectly by longitudinal motion of the ball nut. A first output channel selectively places the primary chamber in fluid communication with at least one component of a brake system for provision of pressurized hydraulic fluid thereto. A second output channel selectively places the secondary chamber in fluid communication with at least one component of a brake system for provision of pressurized hydraulic fluid thereto.

A vehicle braking device includes: a first hydraulic pressure generation unit that is connected to a first wheel cylinder via a first fluid passage, and generates a hydraulic pressure in the first wheel cylinder; a second hydraulic pressure generation unit that is connected to a second wheel cylinder via a second fluid passage, and generates a hydraulic pressure in the second wheel cylinder; a first power supply unit that supplies electric power to the first hydraulic pressure generation unit; a second power supply unit that supplies electric power to the second hydraulic pressure generation unit; and a normally open communication passage opening and closing unit that is provided in a communication passage connecting the first fluid passage and the second fluid passage, and opens and closes the communication passage.

A hydraulic braking system for a motor vehicle, including at least two brake circuits which each include at least one hydraulically actuatable wheel brake and at least one electrically operable pressure generator, the pressure generators being activatable as a function of a brake request of the motor vehicle or a driver of the motor vehicle. A respective electric actuator is assigned to each pressure generator for its operation, and at least one activatable emergency operation valve is interconnected between the brake circuits, which in a first switching position disconnects the brake circuits from one another and in a second switching position connects them to one another.

A vehicle braking device includes a first pressurizing unit including a cylinder, a piston slidable in the cylinder, an electric motor that drives the piston, and an output chamber partitioned by the cylinder and the piston. The first pressurizing unit is configured such that a connection state between the output chamber and a reservoir is switched between communication and cut-off states according to the piston position, and the first pressurizing unit is capable of pressurizing fluid by decreasing a volume of the output chamber by movement of the piston to one axial direction side; a pressure sensor that detects a pressure of the output chamber; and an estimation unit that executes a position estimation process of moving the piston and estimating a switching position of the piston at which the connection state of the output chamber and the reservoir is switched based on a detection value of the pressure sensor.

A method for operating a hydraulic motor vehicle brake system, in the event of a malfunction of the second functional unit includes the steps of generating a hydraulic pressure by means of the first hydraulic pressure generator and controlling at least one of the first valve assembly and the second valve assembly in such a way that a lower hydraulic pressure is established at the rear wheel brakes than at the front wheel brakes. The vehicle brake system includes a first functional unit, a second functional unit, and a control system. The first functional unit includes at least one first hydraulic pressure generator, a first valve assembly, and a second valve assembly, which is arranged between the first hydraulic pressure generator and the rear wheel brakes. The second functional unit includes at least one second, electric hydraulic pressure and a third valve assembly.

A hydraulic block of an electronic braking device for vehicles, includes: a first input port for receiving brake oil from a master cylinder; a first output port for discharging the brake oil to a wheel brake; a first inlet valve port for accommodating a first inlet valve disposed on a first inlet flow path connecting the first input port to the first output port; and a first outlet valve port for accommodating a first outlet valve disposed on a first outlet flow path configured to depressurize the brake oil. The first outlet flow path is configured to pressurize the first outlet valve in an axial direction of a first plunger mounted inside the first outlet valve and to deliver the brake oil to the first outlet valve.

A cuboidal hydraulic block of a hydraulic unit of a hydraulic power vehicle braking system. The cuboidal hydraulic block is for fastening optionally with one fastening side or an opposite fastening side to a splashboard of a motor vehicle, so that the hydraulic unit may be housed optionally with an electric motor on a right side or a left side of the hydraulic block in an engine compartment of the motor vehicle.

To obtain a hydraulic pressure control unit that can be downsized.

A hydraulic pressure control unit (1) for a brake system mounted to a straddle-type vehicle includes: a coil unit (60) used to open/close a channel of a brake fluid; a housing (40) that accommodates the coil unit (60); a placement table (90) held by the housing (40); and a base body (10) having an upper surface (18) to which the coil unit (60) and the housing (40) are connected. The placement table (90) is configured that at least a part thereof is arranged below a portion of a coil housing (65) of the coil unit (60) and that, in a state before the coil unit (60) and the housing (40) are connected to the base body (10), a support section (91) supports the portion of the coil housing (65) from below.