摘要:
A hydraulic brake system with skid control is provided with digitally switchable inlet and outlet valves. An inlet valve includes a variable flow area valve control that is actuated as a function of differential pressures in order to reduce the valve noise.
摘要:
A brake system arranged for the control both of the brake slip and of the traction slip is presented. In order that during a traction slip control action the brake circuits are rapidly supplied with the required volume of hydraulic pressure fluid at a sufficiently high pressure level, a medium-pressure accumulator is provided which is connected to the suction side of the pump and whose pressure supplied upstream of the pump is higher than the resistances in the brake circuit, in particular higher than the sum of the opening pressures of the suction-side and delivery-side valves of the pump plus the resistance of the wheel brake.
摘要:
An anti-locking brake system is provided, wherein, during a control operation, the brake conduit is blocked by a separating valve. The wheel brakes, through a return conduit, are in communication with the intake side of a pump. Provided in the return conduit is an outlet valve. The pressure side of the pump, through a pressure conduit, is in communication with the brake conduit between the separating valve and the wheel brake. A restriction element is provided in the pressure conduit. Check valves between the master brake cylinder and the pressure side of the pump enable pressure fluid, if an enhanced amount of pressure fluid is required by the control circuit, to be fed from the master brake cylinder into the control circuit.
摘要:
A brake system includes a flow control valve as an inlet valve wherein a restrictor is arranged in the return line and a variable restrictor is arranged in the brake line. The resulting system achieves improved controlled behavior and a reduced capacity pump can be used.
摘要:
The invention pertains to a valve unit, comprising a valve housing (8) with a flow control valve, an electromagnetic actuating element (1) that is structurally arranged in series with the flow control valve in the valve housing (8), and a piston (3) that forms the flow control valve and produces an unobstructed pressure medium connection between a pressure medium source (4) and a pressure medium sink (5) in its normal position. In its normal position, the actuating element (1) is supported on one end face of the piston (3) against the force of a compression spring (2). In the operating position, the actuating element separates from the piston (3) and assumes an intermediate position in which it controls the volume flow of the pressure medium between the pressure medium source (4) and the pressure medium sink (5). This results in a simple and reliable valve construction.
摘要:
A brake system including a master cylinder connected to wheel brakes is supplemented by a fluid return system made up of return pumps so that the braking pressure can be adjusted in the wheel brakes. In order to extend this system to a brake system which permits the generation of wheel brake pressure without the application of the brake pedal, the suction side of at least one return pump is connected to the pressure side of a charging pump which aspirates fluid directly from the supply reservoir. To prevent the pressure in the low-pressure range of the system from rising excessively high, the charging pressure of the pump is adjusted so that it only slightly exceeds the precharging pressure of the suction side of the low-pressure accumulator.
摘要:
A switchable solenoid valve is disposed between the master cylinder port and the wheel caliper port for an anti-lock brake system. The switchable solenoid valve includes a valve housing, a valve seat that includes a center orifice and a plurality of perimeter bores, and an axially moveable valve plate and tappet for sealing against the valve seat. The switchable solenoid valve is movable between a normally open position, a closed position and an intermediate position that occurs when the brake system is in anti-lock mode. In the open position, both the valve plate and tappet are spaced away from the valve seat to allow unrestricted pressure fluid flow between the master cylinder and the wheel caliper. When the solenoid valve is moved in to the closed position, the valve plate is in face-to-face engagement with the valve seat to seal the perimeter bores while the tappet is simultaneously sealingly engaged with the center orifice. When the brake system is in anti-lock mode, the valve is switched into the intermediate position and the valve plate remains sealed against the valve seat due to a pressure difference between the master cylinder port and the wheel caliper port, while the tappet moves partially away the center orifice to permit restricted fluid flow to flow between the master cylinder port and the wheel caliper port.
摘要:
A pump having a simple and compact construction which permits leakage test of the pressure valve both outside and inside the pump housing, and, if necessary, ensures ease of replacement of individual parts, such as replacement of the pressure valve or the valve seat member, if leakage occurs during testing. The peripheral surface of the valve seat member facing the cover has a conical chamfer onto which an annular projection of the cover is movable into sealing abutment and is radially expandable to provide a press fit engagement.
摘要:
This invention relates to a valve with a valve housing which has several valve components. Sealing surfaces are provided on the circumference of the valve housing which correspond with a valve accommodating body carrying the valve housing. These surfaces are adapted to engage the valve accommodating body where (in dependence on the relative motion of the valve housing in respect of the valve accommodating body) the material volume existing on the circumference of the and plastically displace it into a circumferential recess of the valve housing.
摘要:
A one-time bleed valve with reset capability for an anti-lock hydraulic control unit comprises a piston adapted to be sealingly installed in a bore made in a body of the hydraulic control unit in response to a brake pressure. The bore is located in a portion of the body that is immediately under a recessed part of the body that accommodates a normally open electromagnet valve. On its one end, the bore is in communication with a primary hydraulic pressure circuit, whereas on another its end it is connected with a low-pressure line. Owing to such a structure, when the piston sits loosely in the bore, an air communication is established between the primary hydraulic pressure circuit and the low-pressure line, and air can evacuate from the low-pressure brake circuit on exposure to a vacuum applied to the primary hydraulic pressure circuit. To provide the bleed valve with a reset capability, an access hole is made between outside of the body and the bore. Also disclosed is a hydraulic brake system for vehicle wheels that employs bleed valves of the above-described structure.