A vehicle brake booster system includes a reservoir, a pump, and a brake booster. The brake booster includes an input member adapted to receive a manual braking input force and an output member adapted to apply a braking output force to a master cylinder. A supply line couples the pump to the brake booster, and a return line couples an outlet of the brake booster to the reservoir. A flow of hydraulic fluid pumped to the brake booster provides a boost factor by which the braking output force exceeds the braking input force. The brake booster is hydraulically lockable by a first valve in the supply line and a second valve in the return line such that when the first and second valves are closed, a quantity of hydraulic fluid is trapped within the brake booster to maintain operation of the brake booster without continued operation of the pump.

An electric braking device includes an electric cylinder unit. The electric cylinder unit includes electric cylinder devices, a housing, and a circuit board accommodated in a board case. The electric cylinder devices are supported by the housing so as to be removable from the housing by being moved relative to the housing in a first X-axis direction. Electric motors of the electric cylinder devices are provided with male connectors, and the board case is provided with female connectors. Fitting between the male connector and the female connector is released by moving the male connector relative to the female connector in the first X-axis direction.

The present disclosure relates to a hydraulic pump assembly comprising: a variable displacement pump, preferably a load-sensing variable displacement pump, for outputting a volume flow rate of a hydraulic fluid, an electric motor for driving the variable displacement pump, in particular a swashplate or swivel angle pump, via a variable-speed drive shaft, and a control unit which is connected to the variable displacement pump and the electric motor and is configured to provide a predetermined volume flow rate by controlling the variable displacement pump and the electric motor. The hydraulic pump assembly is characterized in that the pump assembly further comprises a temperature sensor connected to the control unit, which senses a winding temperature of the electric motor, wherein as long as the winding temperature is below a threshold, the control unit is configured to provide the predetermined volume flow rate.

An arrangement for operating a load-controlled hydraulic system of an agricultural tractor, includes a hydraulic pump generating a system pressure and having an actuating device to adjust a displacement volume, a hydrostatic vehicle steering system connected to the hydraulic pump and having a steering orbitrol and a first load-indicating pressure, a pressure-regulating valve connected upstream of the steering orbitrol and actuated via a pressure difference decreasing across a throttle element counter to a predetermined restoring force in accordance with the first load-indicating pressure, a second hydraulic consumer connected to the hydraulic pump and feeding a second load-indicating pressure back to a shuttle valve arrangement, which compares and transmits the respectively higher of the first and second load-indicating pressures to the actuating device to adjust the displacement volume, and a pressure-copying valve indirectly feeding back the first load-indicating pressure to the shuttle valve arrangement.

Disclosed herein an electronic brake system includes a first block in which a mechanical unit operated mechanically in association with a brake pedal is disposed; a second block in which an electrical unit electronically operated and controlled by an electronic control unit is disposed; and a connection line configured to hydraulically connect the first block and the second block, and the first block and the second block are installed at positions spaced apart in a vehicle so that mountability of the brake system and the degree of freedom in design of the vehicle may be improved.

The present disclosure relates to an electronic brake system and an operation method thereof. The electronic brake system includes a reservoir in which a fluid is stored, a hydraulic pressure supply device configured to generate a hydraulic pressure by operating a hydraulic piston in response to a signal from a pedal displacement sensor detecting a displacement of a brake pedal, a hydraulic control unit including a first hydraulic unit configured to control the hydraulic pressure to be transferred from the hydraulic pressure supply device to a first hydraulic circuit including two wheel cylinders, and a second hydraulic unit configured to control the hydraulic pressure to be transferred from the hydraulic pressure supply device to a second hydraulic circuit including other two wheel cylinders.

An electronic brake system is disclosed. The electronic brake system includes a pedal operation part connected to a brake pedal so as to provide better pedal feel to a driver of a vehicle; a first hydraulic circuit which includes two wheel brakes, a first hydraulic pressure supply part generating hydraulic pressure, and a plurality of valves, and is hydraulically connected to the pedal operation part; a second hydraulic circuit which includes the other two wheel brakes, a second hydraulic pressure supply part generating hydraulic pressure, and a plurality of valves, and is hydraulically connected to the pedal operation part; a first electric circuit configured to control the first hydraulic circuit; a second electric circuit configured to control the second hydraulic circuit; and a power-supply source configured to supply power to the first electric circuit and the second electric circuit. The first electric circuit and the second electric circuit are operated independently of each other.

A motor unit includes: a motor provided with a first chamber and including a shaft; a rotary member coupled to the shaft outside the first chamber; a housing provided with a second chamber accommodating the rotary member; and a guide member including a peripheral wall between the first chamber and the second chamber, the guide member being provided with a third chamber inside the peripheral wall, wherein the motor unit is provided with a fourth chamber which is outside the first chamber and is open to an inner surface of the second chamber and/or the third chamber, the inner surface of the third chamber includes a guide, and the guide extends farther away from a rotation axis as is closer to the fourth chamber.

A redundant brake unit for a motor vehicle comprises: an inlet port configured to receive fluid under pressure from an external source; an outlet port connected to a supply passage and configured for fluid connection to a wheel brake; a reservoir port connected to a return passage and configured for fluid connection to a fluid reservoir; a boost valve configured to selectively control fluid communication between the inlet port and the supply passage; and a pressure supply unit including a pump element configured to pump fluid between the return passage and the supply passage. The pump element has an inlet directly connected to the reservoir port with no actuated valves therebetween. A normally-closed valve and a throttle valve are disposed in a series configuration between the supply passage and the return passage, with the throttle valve being operable to control a fluid pressure in the supply passage.

This braking control device comprises a first unit for outputting a supply pressure in accordance with operation displacement of a braking operation member, a second unit between the first unit and a wheel cylinder to increase the supply pressure and output a wheel pressure to the wheel cylinder, a displacement sensor for detecting the operation displacement, and a supply pressure sensor for detecting the supply pressure. The first unit selects either a first mode in which the operation displacement and the supply pressure are independent or a second mode in which the operation displacement and the supply pressure are linked. When the displacement sensor is normal, the first unit selects the first mode and increases the supply pressure based on the operation displacement. When the displacement sensor is not normal, the first unit selects the second mode, and the second unit increases the wheel pressure based on the supply pressure.