A pressure medium unit, in particular for setting and/or regulating a brake pressure in a vehicle brake system having electronic slip regulation, and to a cap-shaped filter element. Pressure medium units are equipped with a housing block having a duct formed therein that conducts pressure medium, a control element that controls a cross-section of the duct, and a filter element assigned to the control element and fixed in the interior of the duct. According to the present system, the filter element is formed in the shape of a cap, and has on its outer circumference a radially protruding fixing segment having an elastically deformable cross-section. A fixing segment realized in this manner compensates differences in expansion between the components caused by changes in temperature, prevents play at the filter element, and provides a particularly good filter effect.

A valve block for an electronic brake system is disclosed. The valve block is configured to have two hydraulic circuits, a plurality of accommodating bores in which valves, pumps, low pressure accumulators, pressure sensors, and a motor are installed in order to control the braking hydraulic pressure supplied from a master cylinder to a wheel cylinder installed in each wheel, and a plurality of flow passages for connecting the plurality of accommodating bores, wherein on opposite side surfaces of the valve block, pump accommodating bores are formed symmetrically to each other to accommodate the pump, and first damping bores having an arrangement parallel to the pump accommodating bores are formed above the pump accommodating bores, wherein on an upper surface of the valve block, a pair of second damping bores is formed so as to be positioned above the first damping bores, and wherein first hydraulic lines are formed in a straight line from a bottom surface of the pair of second damping bores toward a bottom surface of the valve block, so that a discharge side of the pump accommodating bores and a suction side of the first damping bores, and a discharge side of the second damping bores and the bottom surface of the second damping bores are connected by the first hydraulic lines.

In the present invention, when a first protrusion of a shaft abuts on a guide face thereby pressing a first valve element toward the top as seen in the drawing, the guide face is separated from a cylinder seat face, and a large-diameter oil passage is opened. At this time, when the first protrusion abuts on the guide face thereby driving the first valve element to the position where the valve opens, the first valve element is also pressed in a direction perpendicular to the reciprocating direction of the first valve element because the guide face has a spherical surface or a tapered surface. Thus, the first valve element is supported at two points, point E and point F or G, thereby dampening vibrations.

A pressure medium unit, in particular for setting and/or regulating a brake pressure in a vehicle brake system having electronic slip regulation, and to a cap-shaped filter element. Pressure medium units are equipped with a housing block having a duct formed therein that conducts pressure medium, a control element that controls a cross-section of the duct, and a filter element assigned to the control element and fixed in the interior of the duct. According to the present system, the filter element is formed in the shape of a cap, and has on its outer circumference a radially protruding fixing segment having an elastically deformable cross-section. A fixing segment realized in this manner compensates differences in expansion between the components caused by changes in temperature, prevents play at the filter element, and provides a particularly good filter effect.

A valve block for an electronic brake system is disclosed. The valve block is configured to have two hydraulic circuits, a plurality of accommodating bores in which valves, pumps, low pressure accumulators, pressure sensors, and a motor are installed in order to control the braking hydraulic pressure supplied from a master cylinder to a wheel cylinder installed in each wheel, and a plurality of flow passages for connecting the plurality of accommodating bores, wherein on opposite side surfaces of the valve block, pump accommodating bores are formed symmetrically to each other to accommodate the pump, and first damping bores having an arrangement parallel to the pump accommodating bores are formed above the pump accommodating bores, wherein on an upper surface of the valve block, a pair of second damping bores is formed so as to be positioned above the first damping bores, and wherein first hydraulic lines are formed in a straight line from a bottom surface of the pair of second damping bores toward a bottom surface of the valve block, so that a discharge side of the pump accommodating bores and a suction side of the first damping bores, and a discharge side of the second damping bores and the bottom surface of the second damping bores are connected by the first hydraulic lines.

A hydraulic unit, in particular a hydraulic unit for a slip-controllable vehicle brake system, includes a housing block, a pump, and a damping device. The pump has an intake side and a delivery side. The housing block has a pump receptacle that holds the pump, a first fluid duct that intersects the pump receptacle in a region of the delivery side of the pump, and a second fluid duct opening into the pump receptacle in the region of the delivery side of the pump, and a first separation point that seals off the first fluid duct from the second fluid duct. The damping device damps pulsations and reduces operating noise of the hydraulic unit without (i) having a detrimental effect on functional characteristics of the unit, in particular on pressure build-up dynamics of the vehicle brake system, or without (ii) jeopardizing a compact construction of the hydraulic unit.

In the present invention, when a first protrusion of a shaft abuts on a guide face thereby pressing a first valve element toward the top as seen in the drawing, the guide face is separated from a cylinder seat face, and a large-diameter oil passage is opened. At this time, when the first protrusion abuts on the guide face thereby driving the first valve element to the position where the valve opens, the first valve element is also pressed in a direction perpendicular to the reciprocating direction of the first valve element because the guide face has a spherical surface or a tapered surface. Thus, the first valve element is supported at two points, point E and point F or G, thereby dampening vibrations.

A brake system for actuating a plurality of wheel brakes in a normal non-failure braking mode and in a backup braking mode includes an MC-type power transmission unit having a first electric motor. An iso/dump control valve arrangement is associated with each wheel brake of the plurality of wheel brakes. A pump piston is associated with at least one wheel brake of the plurality of wheel brakes. The pump piston is driven by a second electric motor for selectively providing pressurized hydraulic fluid to the iso/dump control valve arrangement. At least one electric brake motor is operative to selectively drive a selected wheel brake. A first electronic control unit is operative to selectively control the first electric motor. A second electronic control unit is operative to selectively control the second electric motor. A third electronic control unit is operative to control the at least one electric brake motor.

A brake system includes a reservoir and a motor-driven master cylinder for actuating a plurality of wheel brakes. A secondary power transmission unit provides pressurized hydraulic fluid at first and second PTU outputs for actuating the wheel brakes in at least one of a normal non-failure braking mode and a backup braking mode. The secondary power transmission unit includes an electric PTU motor and at least two pump pistons. At least two brake pressure sensors are provided. Each brake pressure sensor is located directly adjacent a corresponding wheel brake for sensing hydraulic pressure at the corresponding wheel brake and responsively producing a brake pressure signal. An electronic control unit is provided for controlling at least one of the secondary power transmission unit and the master cylinder responsive to at least one brake pressure signal. The secondary power transmission unit is directly fluidly connected to the reservoir.

A brake system of a machine may receive stability data associated with multiple wheels of the machine. The brake system may initiate, based on the stability data, an automatic electrohydraulic braking operation associated with a brake that is operatively connected to a wheel, of the multiple wheels. The brake may be movable from a de-applied position to an applied position to apply a brake force to the wheel. The brake system may prevent, based on initiating the automatic electrohydraulic braking operation, an operator input from controlling a brake pressure that is supplied to the brake via a valve configuration of the brake system. The brake system may decrease, based on an electrohydraulic input, the brake pressure that is supplied to the brake, via the valve configuration, to move the brake from the de-applied position to the applied position to apply the brake force to the wheel.