Abstract: A pneumatic chamber 20 is configured to include a first pneumatic chamber 21 pressurizing a first piston 11 and a second pneumatic chamber 22 pressurizing a second piston 12. The first pneumatic chamber 21 communicates with the second pneumatic chamber 22. The hydraulic pressure generating unit 55 is internally provided with a hydraulic chamber 30, and the hydraulic chamber 30 is configured to have a first hydraulic chamber 31 pressurized by the first pneumatic chamber 21 via the first piston 11 and a second hydraulic chamber 32 pressurized by the second pneumatic chamber 22 via the second piston 12. The hydraulic pressure generating unit 55 is movable in a thrust direction in a cylinder 2, and the second hydraulic chamber 32 has a function of fixing the moving hydraulic pressure generating unit 55 in the cylinder 2 by causing a thin portion 15 to be elastically deformed in a radial direction due to hydraulic pressure.

Abstract: A pneumatic chamber 20 is configured to include a first pneumatic chamber 21 pressurizing a first piston 11 and a second pneumatic chamber 22 pressurizing a second piston 12. The first pneumatic chamber 21 and the second pneumatic chamber 22 communicate with each other through a communication hole 87 formed via the inside of a retaining bolt 17. The second pneumatic chamber 22 is formed in a hydraulic pressure generating unit 55 moving in a thrust direction in a cylinder 2 and is separable from the first pneumatic chamber 21. In addition, the communication hole 87 is also separated into a communication hole 87a and a communication hole 87b with the corresponding separation, a rod portion 50 of the first piston 11 is also separated into a rod portion 50a and a rod portion 50b, and the communication hole 87b and the rod portion 50b are formed to be movable along with the hydraulic pressure generating unit 55 in the thrust direction.

Abstract: A pneumatic chamber 20 is configured to include a first pneumatic chamber 21 pressurizing a first piston 11 and a second pneumatic chamber 22 pressurizing a second piston 12. The first pneumatic chamber 21 communicates with the second pneumatic chamber 22. The hydraulic pressure generating unit 55 is internally provided with a hydraulic chamber 30, and the hydraulic chamber 30 is configured to have a first hydraulic chamber 31 pressurized by the first pneumatic chamber 21 via the first piston 11 and a second hydraulic chamber 32 pressurized by the second pneumatic chamber 22 via the second piston 12. The hydraulic pressure generating unit 55 is movable in a thrust direction in a cylinder 2, and the second hydraulic chamber 32 has a function of fixing the moving hydraulic pressure generating unit 55 in the cylinder 2 by causing a thin portion 15 to be elastically deformed in a radial direction due to hydraulic pressure.

Abstract: A clutch actuating device has an actuating cylinder with piston and rod-side chamber, a multiplier cylinder with piston-side and rod-side chambers separated by a piston, a rod(s) interconnecting the pistons, and a directional control valve. The valve has a pilot port, ports in fluid connection with piston-side and rod-side chambers of the multiplier cylinder, and a port in fluid connection with a secondary source. When a first fluid pressure (P1) from a first pressure source is applied to the pilot port and rod-side chamber of the actuating cylinder, a second fluid pressure (P2) is applied to the piston-side chamber of the multiplier cylinder by the secondary source. This results in the first and second fluid pressures (P1 and P2) acting on the piston of the actuating cylinder to produce a clutch actuation fluid pressure.

Abstract: A stroke simulator and a bush for a stroke simulator are configured so that a bush provided to a stroke simulator can be attached without direction management. The stroke simulator generates brake reaction force by a simulator piston that is displaced within a cylinder by hydraulic pressure generated according to the operation of a brake pedal by a driver. A cylindrical rubber bush elastically deformed in an axial direction by pressure from the simulator piston to generate brake reaction force, the bush characterized in that a first end section on the simulator piston side and a second end section facing the first end section contain the same number, at least two, of concave sections concaved in the axial direction, and the concave section formed in the first end section and the concave section formed in the second end section are formed in different positions in the axial direction.

Abstract: A bootstrap accumulator system includes an actuator cylinder that drives an accumulator piston through a multiple of nested actuator sleeves, comprising a multistage actuator cylinder.

Abstract: A pressure cylinder includes a pressure-boosting member set, an actuation member set, and a cylinder body, which defines two transversely extending air inlets, two transversely extending air outlets and two air passages respectively axially connected between the two air inlets and the two air outlets for allowing an applied compressed gas to flow through the two air inlets and the two air passages and the two air outlets into an air chamber in the cylinder body to move the pressure-boosting member set and the actuation member set in an oil accumulation chamber in the cylinder body. The hidden loop design for guiding the applied compressed gas does not require any extra pipelines and connectors, avoiding pipeline deterioration or connector loosening problems.

Abstract: The objective of the present invention is to provide a device that accurately communicates a subtle variation of an operation side to an action side. Specifically, in the present invention, an operating device is provided to perform a lock release operation of an extension device. The operating device feeds oil to a valve chamber by pressing a piston. When the flow rate of the fed oil is excessive, the valve is pressed to an opening resisting a biasing force of a compressed spring, thereby a rapid increase in the oil supplied to the action section is suppressed. Further, the supplied oil is suppressed to a very small amount by the throttle section, thereby an increase in the operation amount on the action section side is suppressed while maintaining the supply of the oil.

Abstract: The invention relates to a vehicle brake system, having at least one supply container for delivering brake fluid to a master cylinder and/or to at least one wheel brake of the vehicle brake system. A precharging apparatus for increasing the effective pressure in the supply container is provided, in which the precharging apparatus generates compressed air for increasing the pressure. According to the invention, the precharging apparatus includes a first precharging device, which generates the compressed air from exhaust gases of an exhaust system of the vehicle, and/or a second precharging device, which generates the compressed air from the relative wind.

Abstract: The present invention relates to a pressure generator for a hydraulic vehicle brake system for the regulated generation of a hydraulic brake pressure in a brake circuit, the pressure generator having a multiple-piston pump for delivering a brake fluid with at least two pump pistons and associated pressure chambers, on which the pump pistons act, an actuator for actuating the multiple-piston pump, and a fluid feed line which extends to the pressure chambers and is configured for connection to a storage container, in which a hydraulic fluid is stored. At least one valve is arranged in the fluid feed line and divides the latter into a first section which is arranged upstream of the valve and into a second section which is arranged downstream of the valve, the valve being configured to optionally at least partly shut off or open the second section of the fluid feed line and therefore to control the fluid supply of at least one pressure chamber.

Abstract: Disclosed is a brake for a vehicle, capable of preventing a vacuum connection pipe connected to a brake booster from being rotated. The brake includes a brake booster generating boosting force and including a casing, a vacuum connection pipe coupled with the casing, a master cylinder body connected to the brake booster, and an oil tank communicated with the master cylinder body. The oil tank includes an anti-rotation member extending from one side of the oil tank toward the vacuum connection pipe to prevent the vacuum connection pipe from being rotated.

Abstract: Disclosed is a drive unit, in particular for a closing unit, an injection unit, or an ejector of an injection molding machine. The drive unit comprises a double-acting force transmitting element provided with a small and a large piston unit which are disposed in a cylinder. The large piston unit is adapted to be pressurized by a great force both in input and in output directions. According to the invention, both the large piston unit with respect to the cylinder and the cylinder with respect to a movable element of the drive of the small piston unit are spring-prestressed.

Abstract: An actuator is disclosed, in particular for a locking unit of an injection compression machine, comprising a hydraulic force translator with two piston units moving relative to each other with different effective areas. The foregoing enclose a pressure chamber together with a cylinder or spacer of the force translator. The smaller piston unit is electrically driven, wherein the axial displacement of the smaller piston unit may be transmitted to the cylinder. The cylinder can be fixed relative to a chassis of the injection compression machine by means of a hydraulic clamping device. According to the invention, the pressure necessary for clamping is delivered by a high-pressure reservoir which may be charged during the displacement of the smaller piston unit.

Abstract: A coupling device of a motor vehicle with a clutch arranged in the force flow between a drive motor and a transmission and a dedicated servo-assisted control mechanism. The clutch is designed by way of a pressing spring as a passively lockable and via a clutch release sleeve disengageable and insertable dry friction coupling and the control mechanism includes an operative primary drive between a clutch pedal and the clutch release sleeve and a pneumatically operative servo drive with a pneumatic actuator ordered immediately to the clutch release sleeve and with a control valve controllable by the clutch pedal.

Abstract: An actuator assembly (1) comprises a body (2) in which works an actuating piston (7), a first piston (5) and at least one second piston (6), a chamber (26) containing a substantially incompressible fluid by which each of the first and second pistons (5, 6) acts on the actuating piston (7). The movement of the first piston (5) from a retracted position to an extended position acts via the fluid to cause the actuating piston (7) to move from a retracted position to an operational position, and subsequent movement of a second piston (6) from a retracted position to an extended position acts via the fluid to cause an actuation movement of the actuating piston (7).

Abstract: A drive unit, in particular for a closing unit, an injection unit, or an ejector of an injection molding machine, may be used where a high axial force is applied through a hydraulic power converter. A cylinder of the power converter may be fixed relative to a frame of the injection molding machine through the intermediary of a holding device which is functionally separate from guidance of the cylinder on the frame of the injection molding machine.

Abstract: A brake system includes a master cylinder that pressurizes hydraulic fluid when a brake control portion is operated; a stroke simulator that, when supplied with the hydraulic fluid pressurized by the master cylinder, produces reactive force in response to the operation of the brake control portion; and a stroke simulator disconnecting mechanism, provided in a hydraulic passage between the master cylinder and the stroke simulator, that mechanically interrupts the flow of the hydraulic fluid through the hydraulic passage when the hydraulic fluid is allowed to flow from the master cylinder to the wheel cylinder in response to the operation of the brake control portion. The stroke simulator disconnecting mechanism starts the disconnecting operation before the hydraulic fluid flows from the master cylinder to the stroke simulator.

Abstract: An intensifier is operable to supply force and includes a housing defining a cavity. A ram is slidably positioned within the cavity and partially extends from the housing. The intensifier also includes a force transfer rod and a plurality of power pistons. The ram is moveable between retracted and extended positions along a longitudinal axis. The force transfer rod is selectively moveable between a retracted position where the force transfer rod is not axially aligned with the ram and an advanced position where the force transfer rod is axially aligned with the ram. The plurality of power pistons are axially aligned with each other and the ram. The power pistons are selectively operable to provide an output force to the ram when the force transfer rod is in the advanced position.

Abstract: A hydraulic brake apparatus includes a tandem brake master cylinder having a rod piston moving in response to a brake pedal, and a floating piston moving in response to the rod piston; a separation valve provided in a hydraulic brake circuit connecting the brake master cylinder and brake wheel cylinders in order to establish and shut off communication between the brake master cylinder and the brake wheel cylinders; a pressure control valve unit for controlling fluid pressure to be supplied from an external fluid-pressure supply source to the brake wheel cylinders while the separation valve is in a shutoff condition; and a stroke simulator mechanism for allowing an idle stroke of the rod piston and an idle stroke of the floating piston while the separation valve is in the shutoff condition. The idle stroke of the floating piston starts during the idle stroke of the rod piston.

Abstract: A drive device for closing unit, injection unit or ejectors of a plastics injection molding machine, has a drive element which is axially moveable, and a hydraulic unit which is moveable by the drive element in the same direction as the drive element. The hydraulic unit is a force multiplier with a large piston and a first small piston, which are moveable in relation to one another and differ in size of their effective surface areas. An intermediate part together with the pistons encloses a pressure chamber filled with a pressure fluid. The first small piston is mechanically connected to the drive element. A second small piston with the intermediate part define a fluid chamber connected by a valve, in one embodiment, to the pressure chamber. The hydraulic unit as a whole is moveable for the positioning movement and the intermediate part is blockable against displacement in relation to a fixed frame.

Abstract: A drive device which is used in particular for the closing unit, the injection unit or the ejectors of an injection molding machine for plastics and which has a drive element which can be moved axially by an electric motor, and a hydraulic unit which can be moved in the same direction as the drive element by moving the latter. In drive devices for the applications, it is important to first of all perform a rapid regulating movement and then exert high forces. In a known drive device having these features, the hydraulic unit is a hydraulic cylinder which is adjusted by the electric motor via a stroke spindle during the regulating movement and to which pressure medium is fed via a valve for exerting a high force. In this known drive device, in addition to the electrical installation, a complete hydraulic system is also necessary. In addition, high reaction forces act on the stroke spindle.

Abstract: A pressure intensifier for generating relatively large output force includes a piston driven in an advancing and a retracting direction. The piston provides a relatively large cross-sectional area for a pressurized fluid to act during the retracting stroke. As such, relatively large, heavy, tools may be returned to an elevated position without the use of external force-producing devices.

Abstract: Disclosed is a hydraulic pressure booster cylinder. In a low pressure stroke, in a state wherein a slide piston is positioned close to a third piston, as compressed air is supplied into a second pneumatic chamber, a second piston is moved toward a bore, and thereby the third piston and the slide piston are integrally moved to allow a piston rod to extend out of a cylinder case. In a high pressure stroke, when movement of the second piston is blocked by a load, the slide piston is moved toward a check valve and pushes the check valve in one direction, compressed air flows into a first pneumatic chamber and air existing in the second pneumatic chamber is discharged to the outside, and, by movement of a first piston, a trunk piston portion is moved toward the third piston through the bore while maintaining airtightness.

Abstract: A pressurizing apparatus includes a fixed portion, an input shaft acting directly in an axial direction with respect to the fixed portion, an output shaft extending coaxially with the input shaft to slide with respect to the fixed portion and the input shaft, a direct-connecting mechanism directly connecting the output shaft and the input shaft and causing the input shaft to directly act with respect to the fixed portion to thereby rapidly carry the output shaft with respect to the fixed portion, a fluid pressure mechanism connecting the input shaft and the output shaft in a fluid manner and causing the input shaft to directly act with respect to the output shaft to thereby increase biasing of the input shaft by Pascal's law and transmit the biasing to the output shaft, and a control mechanism actuated by biasing applied by the input shaft to control fluid connection of the input shaft and the output shaft to each other.

Abstract: A master cylinder arrangement (10) for a vehicle hydraulic brake system has a housing (14) and a bore (16), which is formed in said housing along an axis (A) and in which at least one filling chamber (18) and a first pressure chamber (22) are delimited. A filling piston (38) and a first pressure piston (40) connected thereto displace fluid from the filling chamber (18) to the suction side of a hydraulic pump (60), the discharge end of which delivers pumped fluid into a first brake circuit (64), and from the first pressure chamber (22) into the first brake circuit (64). To realize a desired, so-called “entry behaviour”, the filling piston (38) and the first pressure piston (40) are movable relative to one another by a limited amount (s) along the axis (A).

Abstract: An actuating piston (10) of a hydraulically and mechanically actuable, spot-type disk brake for motor vehicles, which is disposed in a sealing and displaceable manner in a cylinder bore of the disk brake is provided with an axial-force-transmitting conical surface (18) cooperating with a corresponding conical surface of a mechanical actuating device of the disk brake. To make the actuating piston (10) lighter in weight but nevertheless to withstand greater stress, the part of the actuating piston (10) comprising the axial-force-transmitting conical surface (18) consists of steel and the part of the actuating piston (10) cooperating with the cylinder bore of the disk brake is made of light metal or of plastics material, said components of the actuating piston being constructed as a single-piece composite component.

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 hydro-pneumatic pressure booster is proposed in which the reservoir chamber is limited by an elastic partition wall instead of a sliding piston.

Abstract: The invention relates to a hydraulic pressure transformer, wherein a storage chamber and a work chamber are connected with each other via an overflow bore into which a plunger piston dips to generate a pressure stage and thereby separates the two chambers for generating a high pressure in the work chamber. An additional connecting conduit with a check valve is provided between the work chamber and the storage chamber.

Abstract: An arrangement for carrying out a two-stage linear movement with a stationary and a movable constructional unit, comprises a hydraulic cylinder and an hydraulic piston preferably in the form of a plunger. The hydraulic piston has a hollow volume which houses a plunger piston which, in turn, rests on a spindle rotated by a servomotor in the movable construct-ional unit. The plunger piston can be displaced axially in the hydraulic piston and also in the hydraulic cylinder by use of the spindle.

Abstract: The combined pneumatic-hydraulic press head includes a body inside which a substantially cylindrical main chamber is defined; the chamber accommodates a main piston and a secondary piston so that they can slide along an axial direction. The main piston has a stem which protrudes from an axial end of the main chamber, and the secondary piston is spaced from the main piston on the side opposite to the stem. The two pistons sealingly divide the main chamber into three chambers: two end chambers, which can be connected to a source of compressed air or to the atmosphere in order to move the two pistons along the axis of the main chamber during the approach of the main stem or spacing motion with respect to the part to be treated, and an intermediate chamber which contains a liquid. An actuation stem is furthermore accommodated in the main chamber and sealingly passes through the secondary piston.

Abstract: The combined pneumatic-hydraulic press with controlled stroke, includes a body inside which a substantially cylindrical main chamber is defined; the main chamber accommodates, so that it can slide along an axial direction, a working piston which protrudes from the body with its stem. The working piston delimits, in the main chamber, a first compartment which contains a liquid and is connected, through a passage, to a secondary chamber which is provided with elements for exerting pressure on the liquid contained in the secondary chamber in order to transfer at least part of the liquid from the secondary chamber to the first compartment in order to axially move the working piston.

Abstract: The distributor is used for supplying a fluid coming from a source of fluid under pressure and under a pressure which is a function of the pressure of a control fluid. The distributor comprises, in a bore (3) made in a body (1), a double valve consisting, on the one hand, of a first piston (21), one end of which defines with a first plug (5) a control chamber (23) receiving the control fluid, while the other end (27) is pierced with a conduit (29) connected to a reservoir of fluid under low pressure (11), an annular chamber (31) surrounding the first piston (21) and being connected to the consumer circuit of the distributed fluid, and, on the other hand, of a disk (33) forming a shutter and resting on a circular seat (35) stationary relative to the body (1) by way of a return spring (43).

Abstract: A bifluidically controlled distributor of a fluid coming from a first source (11) of fluid under high presure, comprises, in a blind bore (1) made in a body, a sliding piston (3) defining, with a plug of the bore, a first control chamber (5) connected to a first source of control fluid, a slide (9) ensuring communication between the first source (11) of fluid under high pressure or a reservoir (13) of fluid under low pressure, and an outlet conduit (15) for the distributed fluid. The bore (1) and the piston (3) are stepped correspondingly so as to determine between them a reaction chamber (25) connected permanently to the outlet conduit (15) and a second control chamber (21) is formed between the slide (9) and the piston (3) and is connected to a second source of control fluid.

Abstract: Disclosed is a brake fluid pressure control apparatus in which an anti-lock control mechanism is connected to a hydraulic booster. A large-diameter piston is combined with a small-diameter piston so that the pressurization effected by the master cylinder M/C can be augmented by virtue of the difference in diameter between these pistons before it is transmitted to the wheel cylinder W/C. By moving forwards, the pistons cause a fluid supply passage between the fluid pressure source and a wheel cylinder W/C to be opened. With this structure, the size and weight of a brake fluid pressure control apparatus can be reduced.

Abstract: A brake system having a master brake cylinder with at least one piston in a stepped bore in which the piston is acted upon at one end by a piston rod and on the other end defines a pressure chamber, from which an outlet or a brake line leads to wheel brake cylinders of at least one brake circuit. The pressure chamber, or the brake line discharging from this pressure chamber communicates on the one hand with a compensation chamber and on the other with an annular chamber, the volumes of both these chambers being variable contrarily by movement of the piston. The connection between the pressure chamber and the compensation chamber is interrupted by a valve, and a connection is then established with a fluid reservoir. A suitable amount of fluid can then be transported from this fluid reservoir into the compensation chamber by means of a return pump.

Abstract: A feed pump, preferably for anti-skid brake systems, having at least one shaft-driven pump piston and at least one compensation element. Some of the brake fluid fed by the pump piston into the brake system during the compression stroke is received in a compensation chamber of the compensation element. During the ensuing intake stroke of the pump piston, an eccentric shaft that also actuates the pump piston actuates a compensation piston of the compensation element, in order to feed the brake fluid that has been temporarily stored in the compensation chamber into the brake system.

Abstract: A track adjusting flow controlling mechanism sets the optimum tension or "controlled sag" in the endless track of a track type vehicle. A piston and associated valve assembly control flow of pressurized fluid to a track adjusting clyinder. Movement of the piston tensions the track with substantially no sag ("S") and subsequent retraction of the piston provides correct track tension with an optimum track sag ("S"). Supply of pressurized fluid to the piston and valve assembly is controlled by the vehicle operator from the operator's station. Conventional track adjusting operations require considerable time and effort and are often an undesirable task. In view of this, the adjusting task is often neglected with the resulting rapid wear of the track and related components. The subject track adjusting mechanism provides a quick and simple operation to provide proper track adjustment.

Abstract: A hydraulic braking system for an automotive vehicle having a power source for generating a hydraulic power pressure, a reservoir, a master cylinder, a regulator and a plurality of wheel brake cylinders for braking respective road wheels, which are divided into a first group of wheel brake cylinders communicated with the master cylinder and a second group of wheel brake cylinders communicated with the regulator. The regulator has a housing defining therein a regulator chamber for introducing the hydraulic power pressure thereinto from the power source and regulating the hydraulic power pressure into a regulated hydraulic pressure in response to the hydraulic braking pressure generated in the master cylinder, and which is positioned in substantially coaxial relationship with the master cylinder and responsive mechanically to depression of a brake pedal.

Abstract: The device comprises a tandem master cylinder, a booster high pressure fluid distributor, 2, a valve mechanism 4 to interconnect the master cylinder and the distributor selectively to a braking circuit. The high pressure circuit is connected to the pipeline 46 which controls the plungers 52, 56 acting on the ball valves 50, 51 respectively. In the event of failure of the high pressure circuit,the valves 50, 51 connect the pipeline 26 directly supplied by the master cylinder and the pipeline 5 which supplies a brake motor 8 for a wheel. The device may be utilized in an anti-skid circuit.

Abstract: An iosolation valve usable with an adaptive braking/traction control system comprising a plurality of passages adapted to communicate to a variety of pressure sources and an outlet port adapted to communicate to at least one brake cylinder. A valve movable to open and close one or the other of opposingly situated first and second passages to alternately communicate a master cylinder to the outlet port or a second pressure source to the outlet port so that when the first passage is closed by the valve the brake master cylinder is isolated from the brake cylinder.

Abstract: A hydraulic brake system for automotive vehicles with a master brake cylinder (1) connected to an unpressurized reservoir and with a brake line (13, 14) connected to a working chamber (4, 5) of the master brake cylinder and leading to pressure control valves of a brake slip control device (40). The pressure control valves are followed by at least one wheel brake (18, 19) with the working chamber (4, 5) of the master brake cylinder (1) being connectable to a pressure medium source (29) upon the start of the brake slip control device. To ensure that in brake systems of different vehicle types, the wheel brakes of which have clearances differing in size, the same master brake cylinder can be used without the master brake cylinder having an undesired long pedal travel and thus a great overall length.

Abstract: A manually/electrically operated brake system for applying a brake to a wheel of a vehicle, including a master cylinder operated by a brake operating member, to generate a manually controlled braking pressure according to an operation of the brake operating member, a wheel brake cylinder for applying a brake to the wheel, a primary fluid passage for connecting the master cylinder to the wheel brake cylinder, an electrically controlled pressure generating device for generating an electrically controlled braking pressure to produce a required braking effect determined based on at least one of an operating force and an operating stroke of the brake operating member, and a switching device provided in the primary fluid passage, for applying the electrically controlled braking pressure to the wheel brake cylinder while disconnecting the master cylinder from the wheel brake cylinder when the electrically controlled pressure generating device is normally functioning, and for applying the manually controlled braking

Abstract: A hydraulic brake system for automotive vehicles has a master brake cylinder connected to an unpressurized reservoir and a brake line connected to a working chamber of the master brake cylinder and leading to pressure control valves of a brake slip control device. The pressure control valves are followed by wheel brake cylinders. The working chamber of the master brake cylinder is connectible to a pressure medium source upon the starting of the brake slip control device. The outlet pressure of the pressure medium source lies above the maximum braking pressure achievable by applying the master brake cylinder. The working chamber's front side (away from the first master cylinder piston) is sealed by a second master cylinder piston sealedly arranged within the master cylinder. The second master cylinder piston is sealed relative to the master cylinder by a non-return valve gasket.

Abstract: Hydraulic pressure transducer having an operating cylinder (10) with an operating piston (12) and operating piston rod (14) adapted for rapid traverse, and a transducer piston (22) and piston rod (24) guided within an axially connected power cylinder (20). The transducer piston rod (24) is of a smaller diameter than the operating piston rod (14) and is capable of plunging into the operating cylinder volume (16), the transducer piston rod (24) extending through a seal (58) separating said operating cylinder volume (16) from the power cylinder.

Abstract: A hydraulic booster in which the booster piston return spring is formed as a tubular conduit to conduct hydraulic supply pressure to a closed center valve. Upon actuation, the valve opens to permit supply pressure to flow into the power chamber and by valving action controls the exhaust of pressure from the power chamber so as to establish the desired actuating pressure therein. The tubular conduit forming the power piston return spring and transporting the supply pressure to the closed center valve permits a shorter overall axial length of the hydraulic booster by accomodating the movement of the supply pressure chamber at the closed center valve. It also permits less charged supply pressure leaking by accomodating a better pressure seal arrangement.

Abstract: A hydraulic multiple-circuit brake system is proposed, the brake amplifier of which has a multiple-chambered refill container. With an intake connection of its pump, an energy supply apparatus comprising a pump and a reservoir is connected at a predetermined fill level (h/2) to the refill chamber which is intended for the supply of an open brake circuit (II). In this manner, it is attained that if there is an energy failure, the open brake circuit will be capable, as a closed brake circuit, of continuing to function.

Abstract: A two stage brake valve for communicating fluid pressure to a brake assembly. The valve has a stepped cylinder formed therein in which a high volume piston and high pressure valve are slidably located. The piston and valve define high volume and high pressure chambers respectively. A set of passageways through the piston and valve communicate fluid pressure from the high volume chamber to the high pressure chamber and from the high volume chamber to a reservoir. Relief valve elements located in the passageways regulate fluid communication between the chambers and reservoir. A motion responsive relief valve comprising a ring and groove is also disclosed which provides an orifice function and facilitates refilling of the first chamber. One embodiment includes a highly compact relief assembly valve assembly having dual poppets which act to communicate fluid pressure from the first chamber to either the second chamber or the reservoir.

Abstract: Hydraulic assistance device, incorporating a casing (10) provided with a bore (12) in which first piston means (16, 18) is slideably mounted, the piston (16, 18) being able to move under the effect of the actuation of a brake pedal between a first position allowing communication between a first chamber (72) which is connected to a braking circuit (70) and a low pressure reservoir (40), and isolating this chamber (72) from a source of high pressure fluid (76), and a second position isolating the chamber (72) from the low pressure reservoir (40) and causing it to communicate with the high pressure source (76), the device also incorporating a second chamber (38) formed in the casing (10), the communication between the first chamber (72) and the reservoir (40) incorporating a second bore (52) in which a control piston (54) of second piston means (54, 60) is slideably mounted, incorporating a bore (56), the first piston having a bore in which a plunger (31) is slideably mounted, the plunger (31) joining the first

Abstract: The hydraulic power braking apparatus comprises a fluid power apparatus (10) receiving fluid pressure from a power steering apparatus of the vehicle, the fluid power apparatus (10) connected at one end to the brake pedal of the vehicle and at the other end to a master cylinder (110). The master cylinder (110) is connected to a fluid displacement multiplier (210), fluid pressure developed by the master cylinder being communicated to the fluid displacement multiplier (210). The fluid displacement multiplier (210) comprises a housing (212) having therein a stepped chamber (211) with a differential area piston (213), the differential area piston (213) having a through passage (240) controlled by a poppet valve (250).