Abstract: This brake hydraulic control actuator increases ability to reserve the leaked brake fluid and degree of freedom for the structural layout in the actuator body.

Abstract: A hydraulic pressure control device is provided which is capable of pressure reduction and pressure increase by electronic control without changing over hydraulic circuits, and which is reliable and simple in structure. A vehicle brake device using such a control device is also provided. A pressure chamber and an offset spring are provided in a hydraulic pressure control valve. A spool valve is moved to a position corresponding to brake operating force, thereby changing over connections between the output port and the discharge port and between the output port and the input port, and adjusting the degrees of opening of valve portions. In this manner, the hydraulic pressure at the output port to a value corresponding to the brake operating force is controlled.

Abstract: The present invention relates to an actuation device for an electrohydraulic brake system of the ‘brake-by-wire’ type which is configured as a tandem master cylinder with a first and a second piston that are respectively biased by a resetting spring in opposition to the actuating direction. The resetting spring associated with the first piston is additionally used as a travel simulator spring which determines the pedal characteristics, and a valve device is provided which closes or opens a hydraulic connection between a pressure chamber accommodating the travel simulator spring and a pressure fluid supply reservoir.

Abstract: A volume reducer for a hydraulic system, particularly useful for low pressure hydraulic systems such as used in engine compression braking systems. The hydraulic system has an actuator and a pressurizer, with a hydraulic line interconnecting the actuator and the pressurizer. A substantially straight section of the hydraulic line is provided, and a slidable body is provided in the substantially straight section. The body slides in the hydraulic line in response to pressure changes in the hydraulic line, and occupies hydraulic line volume, to stiffen the hydraulic system and reduce system sluggishness.

Abstract: Method and apparatus for optimizing the oil flow inside of a diaphragm compressor concerns the previously non-organized oil flow in the head of a diaphragm compressor leading to the previous formation of pockets between the diaphragm and the cover curve, the method and apparatus providing a continuous circulation of oil in the pressure stroke and in the suction stroke which is achieved by means of a valve plate which in the pressure stroke of the piston closes holes in the middle area of the aperture plate automatically and in the suction stroke of the piston again frees those holes automatically.

Abstract: A master cylinder formed of a forward plastic part snapingly secured to a rearward plastic part. The forward part has a tapered draft angle bore and the rearward part has a purely cylindrical bore aligned with the draft angle bore of the front part and conforming to the diameter of the piston of the cylinder. An annular groove is defined by the parts in surrounding relation to the aligned bores and an annular bearing, having a true cylindrical inner surface corresponding to the diameter of the piston, is positioned in the groove to guide the front end of the piston as the piston moves forwardly into the tapered bore of the forward part.

Abstract: An hydraulic system that includes a master cylinder, a slave cylinder, a fluid conduit extending between the cylinders, and a pressure relief valve within the conduit between the cylinders. The pressure relief valve includes at least one port that is closed by an elastic member that overlies the port and that opens when fluid pressure acting through the port exceeds a predetermined level to cause the elastic member to open the port.

Abstract: Of first and second two pressure chambers which are respectively formed on both sides of a first rack and a second rack, incompressible liquid is filled in the second pressure chambers which are positioned on the sides of back pressure at a driving time of the racks, and the second pressure chambers of the both racks are caused to communicate with each other via a throttle.

Abstract: A flow limiting device provided between a clutch master cylinder and a clutch operating cylinder has a first fluid chamber on one axial side in communication with the clutch master cylinder, a second fluid chamber on the axially opposite side in communication with the clutch operating cylinder, and a piston for partitioning the first and second fluid chambers. The piston has on a circumference thereof an annular groove in communication with the second fluid chamber through an inner passage, and a land on the axially opposite side of the annular groove.

Abstract: An upper die and a lower die are combined. A core for molding a concavity and another core are combined with the combined upper die and the lower die at respective prescribed positions. A core for through-hole molding is constructed by the junction of cores that are severally formed with the upper die and the lower die integrally on the extension line of the central axis of the core for molding a concavity. A through-hole is molded with the core for through-hole molding. A concavity in which a valve mechanism is equipped and a communicating hole through which the concavity communicates with the through-hole are molded with the core for molding a concavity. The core for through-hole molding includes an impact hole, in which a tip of the core for molding a concavity is impacted.

Abstract: A damping device for installation in a hydraulic adjustment device such, for example, as for motor vehicle clutches. The hydraulic adjustment device has a cylinder that is either an input cylinder or actuator or an output cylinder. The input cylinder or actuator, which is connected to an operating pedal of the motor vehicle, is also connected to the output cylinder via a hydraulic line filled with fluid. The damping device opposes a throttle resistance to the flow of the fluid in both flow directions. The damping device comprises a disk having first and second spring washers on either side of the disk. The disk has passage openings, which are covered on the respective sides by one of the first and second spring washers. The damping device is installed in the hydraulic adjustment device to suppress disturbing vibrations acts as both a vibration filter and an operating speed limiter. In addition, a constant throttle resistance is maintained relative to the fluid at all ambient temperatures.

Abstract: Apparatus for controlling the gears of a motor vehicle comprising a pivotable gear lever for pivoting between gear positions corresponding to the gear positions for the motor vehicle transmission, a primary hydraulic piston/cylinder arrangement coupled to the gear lever, a secondary hydraulic piston/cylinder arrangement coupled to the gearbox of the motor vehicle, and a hydraulic circuit hydraulically communicating with the primary and secondary hydraulic piston and cylinder arrangements and including a flow limiter valve with an open position in which the hydraulic flow in the hydraulic circuit is not limited and a plurality of closed positions for controllably limiting the hydraulic flow in the hydraulic circuit whereby movement between the various gear positions for the motor vehicle is controlled.

Abstract: A brake fluid pressure generating device includes a master cylinder piston slidably disposed in a cylinder body, a pressure chamber and a power chamber formed in the cylinder body, a master cylinder that generates a master cylinder fluid pressure in response to operation of a brake pedal, a supplemental fluid generator that generates a power fluid pressure, a fluid regulator that regulates the power fluid pressure to a regulator fluid pressure in response to operation of the brake pedal, a pressure increase valve that controls communication between the supplemental fluid generator and the power chamber, and a pressure release valve that controls communication between the power chamber and a reservoir tank.

Abstract: A master cylinder provides separate flow paths through its secondary piston to provide greater fluid flow capacity from the reservoir to both the primary and secondary pressure chambers in response to the removal of brake fluid from the brake lines fed by the primary and secondary pressure chambers by a pump providing brake pressure for activation of one or more wheel brakes independently of the master cylinder. The secondary piston is provided with an axial fluid flow passage having check valves at each axial end permitting fluid flow only out of the axial fluid flow passage into the primary and secondary pressure chambers. A cross flow passage intersects the axial fluid flow passage between the primary and secondary check valves to communicate the axial fluid flow passage with the intermediate chamber and thus with the reservoir through the secondary compensation opening. The additional flow capacity to both pressure chambers provides improved reaction time for a traction control system at any wheel brake.

Abstract: A stroke control tool for controlling the position of a subterranean well hydraulically actuated double acting piston and cylinder actuator assembly. The tool includes hydraulic fluid measuring means positioned adjacent the well and is connected to the actuator by relatively inelastic hydraulic lines so that the volume of fluid communicating between the measuring means and the actuator can accurately be measured for determining the position of the actuator.

Abstract: A master cylinder (12) and pedal feel emulator (10) useful in a brake-by-wire system. A bore (18) of the master cylinder contains three pistons (22, 34, and 28), in tandem, that divide the bore into various zones (26, 24, 32, 30). The emulator contains a piston (74) that divides a bore (72) into two zones (76, 78), and a spring (80) disposed in one of those zones. The zones of the emulator are hydraulically communicated in certain ways with zones of the master cylinder to enable the emulator to be effective during brake-by-wire controlled braking to displace the emulator piston to compress the emulator spring, thereby emulating pedal feel that occurs during hydraulic braking.

Abstract: A master cylinder (32) in a vehicle hydraulic braking installation uhydraulic-fluid supply device for actuating wheel brake cylinders (20). The master cylinder (32) being isolated from the wheel brake cylinders (20) by at least one shut-off valve (30). The master cylinder (32) being associated with a simulator (46) having a piston (50) located in a simulator chamber (56). The piston (50) being subjected to fluid pressure of brake fluid from the master cylinder (32) and an elastic element (52). The master cylinder (32) being of the having a primary piston (44) and a secondary piston (60) slidably located in a bore (45) of a housing (48). Bore (45) has a peripheral groove (72) which is associated with a land (68) on the secondary piston (60) to allow communication with the simulator chamber (56) when the master cylinder (32) is in a positon of rest.

Abstract: A master cylinder with hydraulic reaction. The master cylinder having a housing with a working chamber (12) therein in which slides a hollow main piston (3). The main piston (3) has a bore (130) for retaining a reaction piston (14) to define a reaction chamber (15). The reaction chamber (15) is connected to the working chamber (12) through a non-return valve (22) and a restriction (17). The non-return valve (22) and restriction (17) are mounted to independently move with respect to the main piston (3) to avoid a defect with a rise in pressure in the reaction chamber (15) when brake fluid retained in the working chamber has an excessively high viscosity.

Abstract: There is provided a master cylinder in which a large quantity of working fluid can be supplied rapidly, the air bleeding takes less time in the manufacturing process, and satisfactory performance can be provided when traction control is operated. For the master cylinder MC, a first supply passage 19 for supplying a working fluid from a working fluid reservoir to a pressure chamber 9 through a working fluid supply port 20a, supply passages 22, 23 and 24, and a working fluid supply port 5b formed in a piston 5, a second supply passage 50 is formed in parallel with the first supply passage directly between the working fluid supply port 20a and the pressure chamber 9, and a check valve 51 is disposed in the second supply passage 50.

Abstract: The invention is directed to a hydraulic brake apparatus which includes a master cylinder having a cylinder body and a master piston slidably disposed therein for defining a pressure chamber ahead of the master piston and a power chamber behind the master piston. A control piston is slidably disposed in the cylinder body ahead of the master piston to define the pressure chamber behind the control piston, and adapted to be moved in response to movement of the master piston. An auxiliary pressure source is provided for pressurizing brake fluid to generate a power pressure, and a valve assembly is communicated with the auxiliary pressure source to regulate the power pressure into a regulated pressure in response to movement of the control piston. The valve assembly is adapted to supply the regulated pressure into the power chamber to assist the operation of a brake pedal.

Abstract: A tandem master cylinder with a bore (1a) for retaining primary (3) and secondary (4) pistons. The secondary piston (4) has a bearing surface (40) for retaining a ring (10) slideably located between a first spring (8) and a seal (4b). The ring (10) pushes the seal (4b) back against a shoulder (41) on the secondary piston (4) in order to transmit a compressive force to seal (4b). The intensity of the compressive force varies with the force exerted on and transmitted by spring (8). The secondary piston (4) has a stop piece (42) for limiting the sliding of the ring (10) in the direction of the second seal (4b) in the bore (1a) of the master cylinder resulting in better sliding of seal (4b) within bore (1a). The functional relationship between the stop piece (42) and second seal (4b) provided for a substantially total reduction of any pressure difference between the pressurized fluid supplied to a primary and secondary circuits supplied by the master cylinder.

Abstract: A throttle device for the directionally-dependent influencing of the flow velocity of the fluid in hydraulic actuator systems, in particular of friction clutches in motor vehicles, with a throttle located between a master cylinder and a slave cylinder in the hydraulic system. The throttle is formed by a base body with at least one through hole, which through hole can be at least partly closed by a rubber-elastomer disc. The rubber-elastomeric disc is located on the side of the base body facing the slave cylinder, which disc radially overlaps a through hole, which through hole can be at least partly closed.

Abstract: The invention is directed to a hydraulic brake apparatus which includes a master cylinder having a cylinder body and a master piston slidably disposed therein for defining a pressure chamber ahead of the master cylinder and a power chamber behind the master piston. A control piston is slidably disposed in the cylinder body ahead of the master piston to define the pressure chamber behind the control piston, and adapted to be moved in response to movement of the master piston. An auxiliary pressure source is provided for pressurizing brake fluid to generate a power pressure. A valve assembly having a regulator chamber defined ahead of the control piston is communicated with the auxiliary pressure source to regulate the power pressure into a regulated pressure in response to movement of the control piston, and adapted to supply the regulated pressure into the power chamber to assist the operation of the manually operated member.

Abstract: A manually operated in-line secondary master cylinder can be configured for use with any hydraulic system which accommodates multiple manual input forces, and which requires the secondary input device to operate independently of the primary input device. The secondary master cylinder can be placed directly in a primary system operating pressure line, where it has no effect on system operation until it is actuated. Unlike a conventional master cylinder, the device draws a very small amount of charging fluid directly from the primary system line due to its use of a split piston, free backflow and volume displacement approach.

Abstract: A tandem master cylinder comprising first and second oil chambers having first and second pistons and first and second springs disposed in each of said respective chambers, the second piston being connected with a hydraulic push rod; a bypass chamber; and two one-way valve means mounted at one side of the bypass tube and in the body of the first piston for establishing one-way oil flow passage from the second chamber to the first chamber and then to the second chamber. The tandem master cylinder allows the braking power increasing ratio between the front wheels and the rear wheels to follow a nonlinear curve for improving braking efficiency.

Abstract: The invention is directed to a hydraulic brake apparatus which includes a master cylinder having a cylinder body and a master piston slidably disposed therein for defining a pressure chamber ahead of the master piston and a power chamber behind the master piston. The master piston includes a first piston connected to a brake pedal and a second piston slidably disposed relative to the first piston. The rear ends of the first piston and second piston are exposed to the power chamber, and the front ends of the first piston and second piston are exposed to the pressure chamber. An engaging member is provided for engaging the second piston with the first piston upon forward movement of the second piston. A control piston is slidably disposed in the cylinder body ahead of the master piston to define the pressure chamber behind the control piston.

Abstract: A brake master cylinder with a plunger piston is acted upon by a brake linkage. A floating piston is arranged between two working spaces and separates the first and the second working space fluidically from one another. Each of the two working spaces opens into a main brake circuit, and the floating piston is axially movable in the brake master cylinder. A sleeve is axially movable in the brake master cylinder and is provided at least between the floating piston and the wall of the brake master cylinder. The sleeve and the wall of the brake master cylinder each have an opening which, in interaction, connect the first working space, formed by the floating piston and the plunger piston, to a displacement passage at least in the case of a movement of the floating piston into a first position in the direction of a brake actuation. With a movement of the floating piston beyond the first position, the sleeve is moved axially and separates the first working space from the displacement passage.

Abstract: In a hydraulic brake system of the present invention, the communication between a power chamber 30 of a hydraulic booster 2 and wheel cylinders (WCY) 58, 59 is allowed by a switching valve 64 when fluid pressure of an accumulator (ACC) 46 exceeds predetermined pressure. During braking operation, the fluid pressure of the ACC 46 introduced in the power chamber 30 is introduced directly to the WCYs 58, 59, thereby rapidly actuating brakes and thus improving the response. When the fluid pressure of the ACC 46 is less than the predetermined pressure, the communication between a fluid chamber 57 of a master cylinder (MCY) 3 and the WCYs 58, 59 is allowed by the switching valve 64. During braking operation, MCY pressure developed by a MCY piston 53 operated by an input shaft 21 through a power piston 10 is introduced into the WCYs 58, 59 through the switching valve 64. The brakes can securely work even when the fluid pressure of the ACC 46 is less than the predetermined pressure.

Abstract: A vehicle brake booster comprises: a body having an input port, an output port, and a flow path through which the input port is communicated with the output port; a first piston which is arranged in the flow path, and on which the hydraulic pressure in the flow path acts; a control valve which is abutted against the first piston, and defines a control chamber which is able to introduce or block the hydraulic pressure of an accumulator; a second piston which is arranged downstream of the first piston in the flow path, the second piston being in the form of a stepped piston having a large diameter portion and a small-diameter portion to the end of which the hydraulic pressure in the flow path is applied, and being able to produce a wheel cylinder pressure; a hydraulic pressure chamber formed in the large-diameter portion of the second piston; and a cut valve arranged downstream of the second piston in the flow path.

Abstract: A brake system is provided in which, in the normal operation, the brake pressure in the wheel brake cylinders is generated in a power-assisted manner and the master brake lines are closed by change-over valves. During a functional disturbance, the brake pressure in the wheel brake cylinders is built up by way of a master brake cylinder, such that, when the brake pressure control device operates normally also when the switching valves are closed the brake pedal can carry out a pedal travel and, on the other hand, when there are functional disturbances of the brake pressure control device, at most with a slight idling path of the brake pedal, by the operation of the brake pedal in the master brake cylinder and the wheel brake cylinders, a brake pressure can be generated in a conventional manner.

Abstract: A two stage brake valve communicates fluid pressure to a brake mechanism. The brake valve has an inlet for receiving pressurized brake fluid from a pump, a reservoir port, a stepped bore and a stepped piston member comprising a larger diameter prefill piston and a smaller diameter high pressure piston. The stepped bore and the stepped piston form a high volume prefill chamber and a high pressure chamber. The high pressure piston has a metering groove which controls communication between the inlet and the brake mechanism. A bleed orifice is formed in the high pressure piston and communicates the high pressure chamber to an outer surface of the high pressure piston. The bleed orifice includes an annular bleed groove formed in an outer surface of the high pressure piston and a radial passage extending from the bleed groove to an interior of the high pressure piston.

Abstract: A brake cylinder means (1) for a motor vehicle, comprises a cylinder/piston means (2) adapted to be operated by a brake pedal means for generating pressure in a hydraulic brake system of the motor vehicle, characterized in that the cylinder/piston means (2) is provided in an outer cylinder means (3) in an axially movable manner, a spring means is provided to resiliantly bias said cylinder/piston means (2) against said outer cylinder (3), in an normal actuation position said cylinder (2a) of said cylinder/piston means (2) being essentially non-movable with respect to the piston (2b) of said cylinder/piston means (2), such that the cylinder/piston means (2) being movable against the spring forces of said spring means (4) in said outer cylinder (3).

Abstract: A master cylinder comprising a body (4) pierced with a bore (5) closed on a first side by an end (6) and on a second side by a piston (7). The piston (7) slides in the bore (5) to delimit a pressure chamber (8). The pressure chamber (8) is connected by a pressure pipe (12) to at least one brake motor through an outlet (11) therein. The chamber (8) and the pressure pipe (12) together delimiting a working volume filled with a hydraulic fluid. The working volume is partially delimited by a leak-off device (19) which is responsive to an impact to selectively allow hydraulic fluid to leak off toward the outside of the working volume.

Abstract: A master cylinder and emulator includes a primary piston and a secondary piston which are movable to provide fluid pressure to effect wheel braking in a vehicle. In addition, the master cylinder includes an emulator assembly which supplies conventional pedal feel and travel characteristics when the primary and secondary pistons are substantially immovable due to isolation of the master cylinder from the wheel brakes. The emulator assembly includes a piston that is movable against a selected amount of fluid pressure and spring force while the primary piston remains stationary. The fluid force is supplied by controlling the flow of fluid from behind the piston through a flow restrictive orifice to a conventional fluid reservoir on the master cylinder assembly. The master cylinder and emulator assembly is operable to provide brake actuation assist to an electric or electro-hydraulically controlled braking system.

Abstract: A brake-pressure modulation device in which a hydraulic unit, fitted with solenoid valves, with return pumps, accumulators and dampers of an anti-lock brake system also has a tandem brake master cylinder. The hydraulic unit has a housing with a standard location hole, into which four lip seals identical at least in their outside diameters are inserted. The lip seals hold a primary and a secondary piston of the tandem brake master cylinder. The use of four lip seals with the same outside diameter makes it possible to use the same housing with the standard location hole for different types of vehicle, even when the piston diameter and the operating stroke are changed.

Abstract: A master cylinder (10) for a hydraulic brake system comprises a quickfill stage (28) which in the initial phase of an actuation of the master cylinder rapidly fills an associated brake system with hydraulic fluid upon a relatively short actuation travel. A housing (12) of the master cylinder (10) extends essentially along an axis (A) and comprises at least one pressure chamber (14) formed therein which is open at the actuation end of the master cylinder (10). A quickfill piston and a quickfill chamber of the quickfill stage (28) are essentially formed by a cup shaped component (30) which is guided on the acutation end of the master cylinder housing (12) in a telescopical and pressure chamber sealing manner. This solution can be manufactured economically and requires little installation space.

Abstract: A fluid pressure control device has a sliding member fitted in a housing for switching over the connection and the disconnection between an input port connected to a fluid pressure supply source, an output port connected to a fluid pressure operated device and a release port connected to a reservoir; a reaction chamber for generating a fluid pressure urging the sliding member in a retracting direction; an urging piston operatively connected to the rear end of the sliding member; an input piston operatively connected to an operation member; and a pressure chamber formed between a back surface of the urging piston and a front surface of the input piston; wherein a first pressure receiving area of the sliding member exposed to the reaction chamber is set smaller than a second pressure receiving area of the urging piston exposed to the pressure chamber, and the second pressure receiving area is set smaller than a third pressure receiving area of the input piston exposed to the pressure chamber.

Abstract: The invention relates to an in-line valve connected to a master cylinder for exhibiting the braking of automobile. The in-line valve is comprised of a body 20, a piston 30 installing slidably in the body and a plate spring 40 having a low height for supporting the linear movement of the piston.

Abstract: A hydraulic device comprising at least two cylinder-piston assemblies. Each of the assemblies are of the double-action type with a front and rear chamber on either side of a piston. The chambers are connected in series in a hydraulic control circuit such that the front chamber of a first assembly has a direct connection to a rear chamber of a second assembly. At least one of the cylinder-piston assemblies is provided with a valve assembly which opens a bypass thereby bypassing the piston of the assembly when the piston is situated close to the direct connection at the end of its stroke and the effective piston surfaces are the same in the chambers mutually connected by the direct connection.

Abstract: A master cylinder includes a cylinder body including a cylinder portion, a piston fit into the cylinder portion so as to fluid-tightly divide the cylinder portion into a pressure chamber and a supply chamber, a connecting passage which is disposed in the piston and which connects the pressure chamber with the supply chamber, a valve mechanism which is mounted on the piston and which disconnects the connecting passage when the piston is moved for a predetermined distance and a restriction member installed in the connecting passage for restricting a flow of a fluid from the pressure chamber into the supply chamber when the piston is operated and allowing the flow of the fluid from the supply chamber into the pressure chamber when the piston is returned.

Abstract: A brake pressure generating device for a vehicle includes a cylinder body, a pressure source connected with the cylinder body for generating a pressure, a first piston slidably disposed in the cylinder body for being operated by a brake pedal of the vehicle, a sleeve member disposed in the cylinder body for forming a pressure chamber with the first piston at one end thereof and for being exposed to a regulated pressure chamber at the other end thereof, and a spool valve slidably disposed in the sleeve member for regulating the pressure of the pressure source. A second piston is slidably disposed in the sleeve member for receiving the pressure in the pressure chamber at one end thereof and for being connected with the spool valve to impart a force the spool valve. An elastic member is disposed in the cylinder body and receives a pressure in the regulated pressure chamber. A reaction member is connected with the spool valve at one end thereof and is in contact with the elastic member at the other end thereof.

Abstract: In order to protect a cup-seal non-return valve (1) against permanent deformation, it is suggested to provide radial supporting walls (15) between the cylindrical inner wall (10)* (*translator's note: the correct reference numeral is `14`) and the sealing lip (13). Preferably, three supporting walls (15), roughly 1 mm thick, are provided because both the natural stability and the valve function are safeguarded this way.

Abstract: An automotive hydraulic braking system includes a pivoted brake lever coupled to a master hydraulic cylinder assembly which in turn is coupled by a brake line to a plurality of hydraulically actuatable calipers. A mechanical brake pressure intensifier is provided in-line between the master cylinder and the calipers. Pedal travel is controlled according to a developed formula to approximate preestablished industry standards set for conventional vacuum-assisted hydraulic braking systems.

Abstract: A device for the prevention of the abuse of a dry-plate clutch (1) for a motor vehicle with a manual gearbox, wherein the device acts jointly with a hydraulic master cylinder (3) and a related slave cylinder (4) in the operation of the clutch (1). The device comprises a valve unit (20) which is installed hydraulically in series with and between the master cylinder (3) and the slave cylinder (4). The valve unit opens when the valve body (32) is moved towards the slave cylinder (4). A first passage (53) which extends in the valve body (32) or in the valve housing (21) permits restricted fluid flow through the valve (20) when the valve unit (20) is closed. A device (33,35,41) keeps the valve unit (20) open when the clutch is located in positions between a position of maximum disengagement and a second position located close to the position in which the clutch begins to engage.

Abstract: The present invention relates to a piston with a central valve, in particular for hydraulic boosters, the valve case (6) which is composed of a supporting insert (8) radially embraced by a valve seat (7). It is disadvantageous in some valve cases that sometimes the positive coupling between the two elements in axial direction is not sufficient. The present invention provides a remedy to this problem by using undercuts behind which the valve seat engages the supporting insert in both directions. In an advantageous improvement, the valve insert is of symmetrical design, and a sealing projection is shaped at the valve seat. The guidance of the valve tappet (19) is performed within the piston (1).

Abstract: Left and right two stage brake valves communicate fluid pressure to left and right brake mechanisms, each brake valve having an inlet for receiving pressurized brake fluid, a reservoir, a stepped bore and a stepped piston. The stepped bore and the stepped piston forming a high volume prefill chamber and a high pressure chamber. A prefill drain valve communicates the prefill chambers to the reservoir only when pump pressure is available at the inlet and blocks communication between the left and right prefill chambers and between the prefill chambers and a reservoir when pump pressure is not available at the inlet.

Abstract: A vehicle braking system is characterized by being constructed for self-purging and removal of air from the brake lines to thereby prevent the accumulation of air therein so as to provide a more effective braking system. The braking system has a master cylinder including a fluid reservoir for supplying brake fluid to the braking system and a hydraulically controlled disk brake having a caliper including a plurality of cylinders arranged in the caliper and a plurality of respective hydraulically actuable brake pistons guided in the cylinders. An inlet brake line interconnects the master cylinder and the caliper for supplying brake fluid to the caliper and an outlet brake line also interconnects the master cylinder and the caliper for receiving brake fluid from the caliper.

Abstract: A remote compensation valve (20) through which pressurized fluid from a master cylinder (14) is communicated to the wheel brakes (24, 26) of a vehicle. The compensation valve (20) has a housing (200) with a bore (202) therein for retaining a shuttle piston (210). The shuttle piston (210) has a first land (212) separated from a second land (214) by a groove (216) and an axial bore (218) connected to the groove (216) by a radial bore (224). A first spring (250) carried by the piston (210) urges a poppet valve (244) toward a seat (230) to control the communication of pressurized fluid through the axial bore (218) to an outlet port. A second spring (254) located in the housing (200) urges the piston (210) toward a rest position where the first land (212) engages a pin (234) of a tilt valve (232) to establish communication between the source of fluid and the bore (202) and the poppet valve (244) is seated on the piston (210) to prevent communication through the axial bore (218).

Abstract: A vehicle braking system is characterized by being constructed for self-purging and removal of air from the brake lines to thereby prevent the accumulation of air therein so as to provide a more effective braking system. The braking system has a master cylinder including a fluid reservoir for supplying brake fluid to the braking system and a hydraulically controlled disk brake having a caliper including a plurality of cylinders arranged in the caliper and a plurality of respective hydraulically actuable brake pistons guided in the cylinders. An inlet brake line interconnects the master cylinder and the caliper for supplying brake fluid to the caliper and an outlet brake line also interconnects the master cylinder and the caliper for receiving brake fluid from the caliper.

Abstract: A fluid-operated power booster includes a housing having a main piston slidably mounted therein and a regulating chamber formed in the main piston. A regulating piston is mounted within the regulating chamber and is fixed to an input shaft. The input shaft has a valve mounted on it so that movement of the input shaft and regulating piston in a first direction permits the flow of working fluid into both a working chamber and the regulating chamber, while movement of the input shaft in a second direction causes working fluid to be exhausted from the working chamber. The regulating piston is biased by a mechanical spring whose force must be overcome to initiate movement of the regulating piston and thereby the flow of working fluid to achieve booster action. The output of the device is by way of an output shaft connected to the main piston.