Abstract: A device for amplifying a force includes a prime mover configured to receive a first force, and a secondary mover configured to generate a second force that is greater than the first force in response to the prime mover receiving the first force. The prime mover includes an output that, in response to the first force, rotates about a first axis through a power stroke defined by an angular displacement that is less than ninety degrees. The prime mover's output includes a first end that revolves about the first axis during the power stroke. The secondary mover includes an input, an output, and a body. The input includes a second end that is coupled with the first end of the prime mover's output, and that, as the first end of the prime mover's output revolves about the first axis through the power stroke, the second end of the secondary mover's input also revolves about the first axis and moves relative to the secondary mover's body.

Abstract: A method of calibrating an ultrasound probe includes mounting an ultrasound probe onto a calibration system, transmitting an ultrasound test signal from an element of the probe through a test medium of the calibration system, and receiving the test signal on a matrix of hydrophones such that an element's position relative to other elements and other arrays within the same probe can be computed. Further, the system described herein is configured to detect the acoustic performance of elements of a probe and report the results to an end user or service provider.

Abstract: A screed assembly for a paving machine is disclosed including a main screed portion and a screed extension portion being laterally exterior to the main screed portion. Furthermore, a screed extension tube is coupled to a screed frame and a screed extension portion frame, the screed extension tube adjusts a width of the screed extension portion. The screed assembly may further include an extension tube support mechanism having a bushing circumferentially surrounding the screed extension tube and disposed within a bushing recess defined in the screed extension portion frame. The extension tube support mechanism further having a retainer ring that circumferentially surrounds and is in direct contact with at least a portion of the bushing, and the retainer ring is capable of being adjusted between the bushing and the screed extension portion frame to eliminate an uncontrolled movement of the screed extension tube and the screed extension portion.

Abstract: In order to improve a transmitter unit, especially for a hydraulic brake system, comprising a housing body, a piston which is arranged in the housing body able to move between a starting disposition and a pressure disposition, a pressure chamber bounded by the housing body and the piston, a reservoir for the supply of hydraulic fluid connected by a connection channel to the pressure chamber, a valve unit, which in an open position allows the connection between the reservoir and the pressure chamber and in a closed position breaks this connection, as well as a connection opening for the routing of pressurized hydraulic fluid from the pressure chamber for example to connected hydraulic brake cylinder, so that an escaping of air bubbles from the pressure chamber is more easily possible, it is proposed that in a functional orientation of the transmitter unit, the connection channel opens into a highest end region of the pressure chamber in regard to a direction of gravity.

Abstract: A hydraulic block of a slip regulation of a hydraulic vehicle power brake system that has a master brake cylinder bore and forms a master brake cylinder. In order to prevent a hard impact of a piston of the master brake cylinder against an end stop when the master brake cylinder is released, in particular when there is an abrupt release, for example when the foot slides off a foot brake pedal, a hydraulic return damper that is integrated in the piston is provided.

Abstract: A system and method for performing a diagnostic on a hydraulic system in a vehicle while the vehicle is at a standstill. The method includes, by means of an electronic processor, moving a plunger at a constant rate, determining a position of the plunger, receiving a pressure of the hydraulic system from a pressure sensor, comparing the determined position and the measured pressure to a position versus pressure graph, and sending a diagnostic to a diagnostic indicator.

Abstract: The present invention relates to a master cylinder assembly in a brake system and a piston stop. The master cylinder assembly comprises one or more piston assemblies. At least one of the piston assemblies comprises a piston (1), a piston stop (2) and a spring (3), wherein the piston stop (2) snaps into the piston (1), and the spring is retained between the piston (1) and the piston stop (2) and placed outside the piston stop (2). According to the present invention, on a circumferential wall of the piston stop (2) are provided deep slots (4) extending axially and running through the thickness of the circumferential wall, and these deep slots open towards one side of the piston stop where it snaps into the piston (1).

Abstract: A master cylinder apparatus A1 includes a master cylinder 1 and a reservoir 3. The master cylinder 1 transduces an input to a brake operator into a brake fluid pressure. The reservoir 3 includes a fluid supply hole 3a that is connected to the master cylinder 1. A base body 10 of the master cylinder 1 includes a first cylinder hole 11a into which a piston is inserted, a reservoir union port 13a to which the fluid supply hole 3a is connected, and a communication hole 13d. The communication hole 13d has one end opening in a bottom surface of the reservoir union port 13a, and the other end opening in an inner circumferential surface of the first cylinder hole 11a. A center axis O3 of the reservoir union port 13a passes through a position being apart from a center axis O1 of the first cylinder hole 11a.

Abstract: Disclosed is an electric disc brake capable of reducing noise and vibration while expanding the life span of the product. The electric disc brake includes a caliper housing to press friction pads provided at both sides of a disc against the disc, a cylinder installed in the caliper housing, a piston moving back and forth in the cylinder to press the friction pads, a driving device generating driving force with respect to the piston, and a volume compensation part communicated with the cylinder to compensate for an increment of a volume of the cylinder according to movement of the piston.

Abstract: A fast fill braking system includes a master cylinder, a primary pressure chamber having a first chamber portion located forwardly of a second chamber portion, the first chamber portion having a diameter larger than a diameter of the second chamber portion, and a primary piston including a first piston portion positioned within the primary pressure chamber and a second piston portion extending out of the primary pressure chamber, the first piston portion having a diameter (i) larger than a diameter of the second piston portion, and (ii) complementary to the diameter of the second chamber portion.

Abstract: An actuating armature, in particular a brake and/or clutch armature, has a housing (2) in which is arranged a piston (5) moveable in a cylinder space (3) by an actuating element (7) in order to displace liquid. An equalizing space and/or storage tank (19) is arranged within the cylinder space (3) and/or within the piston (5).

Abstract: A vehicle hydraulic master brake cylinder assembly (12) having a housing (14) with a cylindrical bore (16) for retaining primary (18) and secondary (20) pistons to define primary (26) and secondary (28) fluid pressure chambers. Primary (42) and secondary (44) reservoir pots are connected with primary (32, 34, 36, 80) and secondary (48, 50) conduits for respectively conveying hydraulic fluid between a fluid reservoir and the primary and secondary chambers. A valve (76) operates by the secondary piston (20) to selectively open and close communication between the primary pot (42) and the primary conduit. Upon closing the valve (76), a primary circuit dead stroke is reduced by allowing initial pressurized fluid to develop and be presented to a primary circuit flow path for the primary conduit (32, 34, 36, 80) prior to the closure of a poppet valve (30) closing communication between the primary pot (42) and the reservoir.

Abstract: A master cylinder having at least one piston that pressurizes a hydraulic fluid when a stepping force on a brake pedal is transmitted thereto and sends the pressurized hydraulic fluid to at least a wheel cylinder. The piston includes a large diameter passage and a small diameter passage having a diameter smaller than that of the large diameter passage, and a valve body is fastened to the large diameter passage to control fluid communication between the large diameter passage and the small diameter passage, the valve body including a plunger coupling hole and a channel through which the hydraulic fluid communicates between the large diameter passage and the small diameter passage, wherein a plunger slidably passes the valve body through the plunger coupling hole and closes the channel of the valve body when the stepping force on the brake pedal is transmitted to the piston.

Abstract: An engine includes exhaust manifold integrally formed with a cylinder head. The engine may include an exhaust manifold having at least one single exhaust outlet for exhausting exhaust gas that is exhausted from at least two cylinders that are not adjacent with each other, wherein periods during which exhaust valves are open are not overlapped with each other between the at least two cylinders. The exhaust manifold is integrally formed with the cylinder head such that costs can be reduced. Also, the water jacket is formed between the exhaust passages of the exhaust manifold such that the durability of the turbocharger that is affected by a heat load can be improved. Also, the twin scroll turbocharger is directly connected to the exhaust outlet of the manifold such that the compression ratio of the intake air can be effectively improved.

Abstract: A master cylinder having a housing with a bore wherein front and rear pistons are located by return springs to define front and rear chambers. The front and rear chambers are respectively connected by an axial port and a radial port in the housing to a reservoir. Communication of fluid between the bore and reservoir is controlled by a rear center compensation valve that is linked to a front center port compensation valve such that fluid communication between the front and rear chambers and reservoir is controlled by movement of the rear piston in response to an input force with a first and second actuation springs respectively closing the front and rear center port compensation valves to allow simultaneous pressurization of fluid in the front chamber and rear chamber that is supplied to front wheel brakes and rear wheel brakes to effect a brake application.

Abstract: Brake master cylinder (10) for a motor vehicle, of the type which comprises a substantially axial body (12) inside a bore (14) of which is slideably mounted at least one axial piston, of the type in which the bore (14) comprises two seals, front and rear, interposed between the piston and the bore (14), characterized in that it comprises at least one wide groove (66, 68) which is formed in the bore (14) in front of a groove (70, 72) for retaining the front seal, which extends at least in part around the piston, and which communicates with said retaining groove (70, 72) and the hole in the piston, in order to allow resupplies to occur with a high flow rate.

Abstract: A rear brake control hydraulic master cylinder that dispenses with adjustment work to decrease a clearance between a piston and a push member. A master cylinder 31 includes first and second oil chambers. The piston includes a piston oil passage portion connected to the first and second oil chambers. The push member abuts against and moves the piston to generate a hydraulic pressure in the first oil chamber. A compression spring biases the push member into contact with the piston when the piston is not moved substantially toward the first oil chamber.

Abstract: A tandem master cylinder (1) with central valves has ball-shaped valve members (25, 40) with leaf springs (26, 41) serving as valve springs. The ball-shaped valve members (25, 40) can be manufactured of a plastic material, coated with an elastomer. The size of the balls is preferably adjusted to the size of the pistons (4, 5) to allow a maximum flow while ensuring at the same time that the piston walls retain a thickness. The leaf springs (26, 41) have a bowl-shaped body (61), which is shaped like a partial sphere. To avoid an entrapment of brake fluid or a vacuum between the balls (25, 40) and the leaf springs (26, 41), respectively, a central hole (62) has been provided in the bowl-shaped body (61). The leaf springs (26, 41) are equipped with a plurality of tongue-shaped extremities (63) extending radially outward with end portions (64) bent toward the axial side on which the valve members (25, 40) are located.

Abstract: Master cylinder assembly (1) for hydraulic control includes a master cylinder body (2) having a longitudinal bore (3). A piston (6) is arranged in the said bore and includes a seal packing (15) separating two chambers (16, 29) adapted to contain a liquid. The piston also includes a recovery conduit (36) connecting the chambers and by-passes the seal packing, and a valve (38). When the piston is in a rest position, an actuator (54) adjusts the position of the valve between an open position opening the recovery conduit and a closed position closing the recovery conduit.

Abstract: A pressure locking master cylinder including a fluid reservoir for storing a hydraulic fluid, a housing, a piston slidably received within the housing and defining a working chamber and a blocking chamber, wherein the blocking chamber is in fluid communication with the reservoir, and a valve positioned between the blocking chamber and the reservoir, the valve being adapted to selectively trap the hydraulic fluid within the blocking chamber to lock the piston in a position with respect to the housing.

Abstract: A differential hydraulic master cylinder (10) has a cylinder body (12) in which is provided a larger diameter first chamber (18) and a smaller diameter second chamber (20). A first fluid passageway (60, 74, 78, 80) connects the first chamber (18) with a source of ambient pressure and contains a pressure relief valve (70) for connecting the first chamber with said source of ambient pressure when the pressure in the first chamber reaches a threshold value. A second fluid passageway (76, 78, 80, 82) connects the first chamber (18) with an outlet (11) and the second chamber (20). A non-return valve (72) is located in the second passageway to prevent hydraulic fluid from flowing from the second chamber (20) to the first chamber (18) at least when the pressure relief valve (70) is open. The non-return valve (72) and the pressure relief valve (70) each have a movable valve member (100, 102, 88; 122) which are mechanically interconnected.

Abstract: Injection apparatus is provided for injecting a drive fluid, such as liquefied nitrogen, into the working chamber (50) of a cryogenic engine. Liquefied nitrogen is admitted to a housing (36) of the apparatus under the control of an inlet valve (42) and expelled from the housing (36) under the control of an outlet valve (48). In the housing (36), heat is transferred to the liquid nitrogen to cause a small volume of the liquefied nitrogen to boil and thereby inject the drive fluid into the cryogenic engine under pressure. In each of two embodiments (FIGS. 1 to 7) the liquid nitrogen is transferred to a warmed region of the housing by a moveable injection member (4, 20) and in two further embodiments the housing is formed as a heat exchanger through which the nitrogen passes.

Abstract: The present invention is directed to apparatus, systems, and methods for incorporating a master cylinder into a hydraulic brake system. An embodiment of the present invention includes a housing, a bore extending through the housing, a cover, and a groove formed in the cover. The housing includes a fluid reservoir formed therein. The bore is capable of supporting a movable piston to actuate the hydraulic braking system. The cover is secured to the housing and the groove in the cover descends away from the center of the cover such that the groove is capable of directing fluid away from the center of the cover.

Abstract: A fluid actuator and retainer assembly, such as a master cylinder assembly for a vehicular braking system, includes a housing having a groove, a cylinder provided within the housing, and a piston assembly. The piston assembly includes a piston disposed within the cylinder for sliding movement relative thereto and a rod connected to the piston and extending from the cylinder and the housing. A retaining structure includes a rod engagement surface in contact with the rod, a plurality of engagement fingers extending from the rod engagement surface, and a detent extending from each of the plurality of engagement fingers into cooperation with the groove to retain the piston assembly in position relative to the cylinder housing.

Abstract: A hydraulic cylinder, in particular a master cylinder for a hydraulic clutch actuation system for motor vehicles, has a housing having a cylinder wall, in which a piston is slidably received to seal off the pressure chamber, whereas the pressure chamber in a rest position of the piston is connected to an after-running region by equalization grooves of an after-running device. The cylinder wall of the housing is provided with profiled cut-outs on its piston-side end at least in a lower region in the installed position of the cylinder, which cut-outs each have an upper boundary surface which in the installed position of the cylinder rises up to the equalization grooves of the after-running device.

Abstract: A center valve for a master cylinder includes a valve body and a valve seat fitted in a valve casing. The valve seat has an elastic tube fitted on a core member. The elastic tube has a front end portion adapted to be pressed against the rear end face of the valve body, and a rear cylindrical portion. A gap is provided behind the cylindrical portion of the elastic tube. When the front end of the elastic tube is deformed, the cylindrical portion of the tube is also deformed in such a way as to fill or protrude into the gap. Because the rear cylindrical portion is also deformed, the degree of deformation of the front end is suppressed. This prevents the front end of the tube from getting trapped between the valve body and the core member of the valve seat and thus getting torn.

Abstract: A master cylinder includes a primary cup received in a groove formed in the inner wall of the cylinder body. Projections are formed on a radially inner portion of the cup so as to protrude forwardly from the front end of the radially inner portion. The projections are adapted to be pressed against the front end wall of the cup-receiving groove and elastically deformed under a pressure difference produced between the front and rear ends of the cup when the piston is returned quickly, allowing the cup to advance in the cup-receiving groove. When the cup advances in the groove, a fluid passage is defined between a base portion of the cup and the rear end wall of the groove.

Abstract: The invention relates to a piston having a valve arrangement for a vehicle hydraulic brake system comprising a piston channel penetrating the piston, a valve seat formed around an opening of the piston channel, and a valve element, which is displaceable relative to the piston and which for sealing the piston channel is positionable in a fluid-tight manner against the valve seat, wherein the valve seat takes the form of an annular projection on a sealing component, which comprises an elastic sealing element and a support element, which stabilizes the sealing element, and wherein the support element is designed in a region close to the sealing projection with a corresponding annular recess.

Abstract: A caging arrangement for setting a spring height and correspondingly chamber size in a master cylinder. A cylindrical member has a convoluted surface that is placed in a bore of a piston and a ball is pressed into the cylindrical member to radially expand the convoluted surface into engagement with the piston. A spring is placed on the piston and a disc placed on the spring. A first end of a valve stem having a radial projection is passed through the disc and a force applied to the valve stem while holding the piston stationary such that the radial projection engages and outwardly moves an inward flange on the cylindrical body to allow the radial projection to move past the inward flange. The force is removed and the spring expands until the radial projection engages the inward flange to set distance between the piston and the valve stem.

Abstract: A master cylinder with increased safety having a piston produced by molding a plastic or aluminum alloy. The piston slides in a bore blocked off by an end wall. A valve for the master cylinder bears at rest against a pin that is fixedly mounted in the body of the master cylinder passes through the piston via a longitudinal slot. The dimensions of the master cylinder are determined such that the piston bears against the pin before coming into contact with the end wall of the master cylinder body.

Abstract: A hydraulic piston-and-cylinder arrangement has a piston to which a signal element is assigned and which is accepted movably in a longitudinal direction in a cylinder housing, at which a position sensor is secured, by means of which an axial position of the signal element and therefore of the piston in the cylinder housing can be sensed. The signal element is fitted to the piston by means of a holding cap. As a result, a hydraulic piston-and-cylinder arrangement with a device for sensing the piston position is created, in which the signal element of the sensing device, which signal element operates in conjunction with the position sensor on the cylinder housing, can be fixed in a simple manner on the piston, which also permits a sizing of the signal element largely independent of the piston geometry.

Abstract: A master cylinder piston for use in a motor vehicle having a flap (22) that is biased towards a position to shut off a pressure-fluid passage (24) by a return spring (28) resting on a cage (30). A flange (38) on a cage (30)for the Spring (28) is located in an annular groove (44) provided in the housing (20) for the flap (22) when the cage (30) bears axially on an inner shoulder (64) of the housing (20).

Abstract: A vehicle braking system master cylinder that can handle pressure pulses within the brake fluid of a vehicle braking system without the destruction of components internal to a master cylinder. A vehicle braking system master cylinder that allows for component subassembly external to the master cylinder and is self-aligning when assembled. Finally, a vehicle braking system master cylinder that allows for variable travel of the primary piston and the secondary piston within the master cylinder and greater fluid flow in the vehicle braking system.

Abstract: A master cylinder (10) for a vehicle hydraulic brake system has a housing (12), which has a bore (14), which extends along a longitudinal axis (A) and is sealingly closed at one end by an end wall forming part of the housing (12) of the master cylinder (10) and at the other, opposite end by a closure element (16). A piston (18), which is guided in the bore (14), extends in a sealing and axially displaceable manner through the closure element (16). A central valve (20) is formed on the piston (18) and enables a fluid connection between a fluid reservoir and a pressure chamber (28) delimited in the bore (14) by the end wall and the piston (18) and, in the non-actuated state of the piston (18), is held in open position by an abutment component (34) acting upon the closure element (16).

Abstract: A master cylinder (10) having an axial body (12) with a bore (14) for receving a piston (16, 18), a front seal (26, 28) and a rear seal (30, 32) to delimit a rear supply chamber (34, 38) from a front pressure chamber (36, 40). A supply duct (42, 48) in the body (12) that connects a reservoir to the rear supply chamber (34, 38) has an opening between the front seal (26, 28) and the rear seal (26, 28). The front seal (26, 28) is mounted in a groove (110, 112) of the body (12) and has an interior lip that contacts the piston (16, 18) and lifts off the piston (16, 18) as the piston (16, 18) returns from a position of application to a position of rest to allow hydraulic fluid to be resupply the front pressure chamber (36, 40).

Abstract: A master cylinder having a body with a bore therein delimited by a piston into a work chamber and a supply chamber. The work chamber (16) is connected to wheel brakes, while the supply chamber is connected to a fluid supply, through a supply duct. The piston has a shank retained by a guide ring mounted in the bore and a head bears against a thrust ring in a rest position. A first end of the supply duct is connected to the fluid supply, while a end is connected to the supply chamber. A hydraulic damping arrangement that dampens movement of the piston toward the thrust ring and includes structure for shutting off the second end of the supply duct such that brake fluid flows at a reduced flow rate from the supply chamber to the supply duct through at least one exhaust duct.

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 master cylinder having first and second chambers respectively connected to a reservoir and to front and rear wheel brakes in a brake system. First and second center port compensation valves each have a head that is connected to a stem that joins a first retainer with a second retainer to cage a first spring of the first and second, resilient means. Each head is urged into engagement with a seat by a second spring to terminate communication from between the bore and reservoir on compression of the first spring in response to an input force being applied to the first piston to initiate a brake application. The head has a cylindrical body with an annular axial projection that extends therefrom to define a face and a resilient ring that surrounds the annular projection with a lip that axially extends beyond the face.

Abstract: A vehicle braking system master cylinder that can handle pressure pulses within the brake fluid of a vehicle braking system without the destruction of components internal to a master cylinder. A vehicle braking system master cylinder that allows for component subassembly external to the master cylinder and is self-aligning when assembled. Finally, a vehicle braking system master cylinder that allows for variable travel of the primary piston and the secondary piston within the master cylinder and greater fluid flow in the vehicle braking system.

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: Hydraulic master cylinder for a motor vehicle braking circuit, comprising means for concealing the dead travel of the primary (16) and secondary (44) pistons, these concealing means consisting of additional valve shutters (80) borne by the valve shutters (26, 56) that shut off the axial passages (22, 58) formed in the primary (16) and secondary (44) pistons, these additional valve shutters allowing the pressure in the primary (18) and secondary (52) chambers to increase right from the start of movement of said pistons over their dead travels.

Abstract: A brake system having a master cylinder with a center port compensation valve wherein a head on a stem for caging a return spring moves within a poppet assembly as a direct function of the compression of the return spring during the development of pressurized fluid that is supplied to wheel brake to effect a brake application.

Abstract: The piston of a master cylinder in the power train of a motor vehicle is made, at least in part, of a thermosetting plastic material and cooperates with one or more annular seals to ensure that a source of hydraulic fluid is communicatively connected with the chamber in the housing of the master cylinder when the piston is moved by one or more springs or otherwise in a sense to increase the volume of the chamber. When a pedal or another actuator causes the piston to expel pressurized fluid from the master cylinder into a slave cylinder, the seal or seals cooperates or cooperate with the housing and/or with the piston of the master cylinder to seal the source from the chamber of the master cylinder. The slave cylinder can actuate the friction clutch between the prime mover and the transmission in the power train of the motor vehicle.

Abstract: In a process for manufacturing a master cylinder (23) wherein a piston (9) that carries a valve (37) is assembled within a cylinder to define a chamber (41).

Abstract: The present invention mainly relates to a manufacturing process for a master cylinder, in particular a tandem master cylinder, such process including a dead-stroke adjusting step, and it also concerns a master cylinder manufactured using said process.

Abstract: A hydraulic brake master cylinder assembly includes a central or center port compensation valve mounted in respective brake actuator pistons and having a variable length stem which may be adjusted to predetermine the amount of valve travel between open and closed positions in response to actuation of the brake cylinder piston or pistons. The variable length stem includes a hub and a sleeve which is force fit over the hub and may be moved to set the length of the stem. The amount of gap or open position of the valve in the primary piston may be determined by installing the primary piston in the master cylinder, holding the piston in a fixed position and installing a seal retainer and washer for engaging the primary piston pin to move the pin to set the length of the valve stem.

Abstract: A master cylinder having a body (10) with a bore (12) therein in which slides at least a primary piston (20). The primary piston (20) has a compensation passage (58), which in a position of rest, places a pressure chamber (24) in communication with a reservoir (14). The communication between interrupted upon actuation of the master cylinder by a control rod (18) acting on a second piston (48) sliding in the bore (12). A first compression spring (28) and a second compression spring (42) urge the primary piston (20) and second spring (16) toward a rear position of rest. The preload force of the first compression spring (28) exceeding that of the second compression spring (16) such that the second piston (48) is the first to move in response to a force applied to the control rod (18). The rear position of rest for the primary piston (200 and second piston (48) is defined by a same stop (36) which is integral with the body (10) of the master cylinder.

Abstract: A brake system for (10) a vehicle having a brake booster (14a) with an output put rod (152a) for providing a primary piston (310) in a master cylinder (12a) with an input force to pressurize fluid which is supplied to wheel brakes (10a) of a vehicle to effect a brake application in response to an operator input force. The master cylinder (12a) has a first housing (202a) with a bore (202a) therein for retaining the primary piston (310) in a first pressure chamber (212a). The bore (202a) has a first compensation passage (206a) connected to a fluid supply (204a) and an outlet port (218) connected to the wheel brakes (10a). The primary piston (310) has a first position of rest whereby the first pressure chamber (212a) is connected to a fluid supply (204a) through the first compensation passage (206a). The brake booster (14a) has a second housing (102,104) with an interior separated by a movable wall (122) into a front chamber (108) and a rear chamber (110).

Abstract: A master cylinder having a body (1) pierced with a bore (100) that is partially closed by a guide ring (11). A piston (3) mounted to slide in the guide ring (11) and bore (100) to define a pressure chamber (4) within the bore (100). An inlet (2) having a filling duct (21) which connects the bore (100) with a source of hydraulic fluid having a low pressure when the piston (3) is in a position of rest. The filling duct (21) is located between a flared portion (104) of the bore (100) and a front edge (62) of a ring (6) which slides in the body (1) between the guide ring (11) and pressure chamber (4). The piston (3) and sliding ring (6) have respective a first stop (31) and a second stop (61) which allows the piston (3) to drive the sliding ring (6) along when the piston returns to a position of rest.

Abstract: An annular sealing element (16) for sealing an annular gap between the inner surface of a cylindrical wall and a cylindrical piston which can be displaced axially relative to said wall and is arranged concentrically therewith, has two separate annular and axially adjoining parts (42, 44), of which the first part (42) consists of an elastomer material and the second part (44) consists of a rigid material. In order to ensure, in conjunction with a displaceable body of a valve, that the opening and closing behavior of the valve is as constant as possible, the two parts (42, 44) are connected to one another in a releasable manner, and the part (44) made of rigid material has an axial protrusion (46) which is formed integrally with it, runs around it in the form of a ring, passes more or less to the full extent through the part (42) made of elastomer material and has its end surface covered over to the full extent by the part (42) made of elastomer material.