Abstract: A control device is for a hydraulic valve bicycle component and has a housing defining a fluid port in fluid communication with a hydraulic valve of a bicycle component and has a lever having a proximal end coupled to the housing and a distal end. The proximal end of the lever is rotatable about a pivot axis. The lever includes an actuation surface near the distal end. The control device has a cavity within the housing. The cavity includes a fluid chamber in fluid communication with the fluid port. The control device has a piston disposed within the cavity and movable by actuation of the lever along a piston axis. A first plane perpendicular to the piston axis and containing the piston axis is offset a distance from a second plane perpendicular to the piston axis and extending through the actuation surface of the lever.

Abstract: A primary piston assembly for a master brake cylinder of a braking system of a vehicle, including a first primary piston component having a first piston element to which a driver braking force is transmittable in such a way that a pressure chamber volume of a pressure chamber of a master brake cylinder of the braking system which is fillable with liquid is reducible by moving the first piston element with the aid of the driver braking force, and a second primary piston component having a second piston element to which the first braking assisting force is transmittable in such a way that the pressure chamber volume of the pressure chamber is reducible by moving the second piston element with the aid of the first braking assisting force.

Abstract: According to one embodiment, a rotor brake includes a first braking surface having an opening therethrough, a second braking surface adjacent to the first braking surface, and an impeller disposed between the first and second braking surfaces such that rotation of the impeller pulls fluid through the opening of the first braking surface and expels the fluid out through a gap between the first and second braking surfaces.

Abstract: A brake fluid reservoir is connected to a master cylinder by a neck which is arranged in an upper chamber of the master cylinder. Holes extend through a surface of a piston, opening to a pressure chamber. The piston extends through a bore hole of the master cylinder. A drill hole extends through an interior wall of the master cylinder, opening into the bore hole, thereby providing communication between the fluid reservoir and the pressure chamber. A floating orifice plate is arranged within the upper chamber, between the neck of the brake fluid reservoir chamber and the drill hole, such that the orifice plate forms a baffle that limits a flow rate of liquid from the brake fluid reservoir chamber to the pressure chamber; and includes supports pressing against a surface of the interior wall of the master cylinder and arranged around the first side of the drill hole.

Abstract: A master cylinder including: a primary chamber; a first piston which is provided in the primary chamber, and has one portion that is moved to the outside of the primary chamber by pressing a pedal; a secondary chamber which is provided to be adjacent to the primary chamber; a second piston which is provided in the secondary chamber, and has one portion that protrudes to the outside of the secondary chamber and is provided to be spaced apart from the first piston at a predetermined interval; and a hydraulic line which connects the primary chamber and the secondary chamber, and is connected with a wheel cylinder, in which the first piston is moved by pressing the pedal, and after the first piston is moved at a predetermined interval, the first piston and the second piston come into contact with each other, and are moved together.

Abstract: A brake booster for use in a hydraulic braking system having a brake pedal, a master cylinder, and a hydraulic control unit includes a housing, a screw drive arrangement positioned at least partially in the housing, a motor coupled to the housing for actuating the screw drive arrangement, and a piston assembly positioned in the housing. The piston assembly and the housing together at least partially define a first fluid chamber having an opening for providing fluid communication with the master cylinder, and a second fluid chamber having an opening for providing fluid communication with the hydraulic control unit. The screw drive arrangement is movable relative to a piston of the piston assembly between an engaged position, in which the first fluid chamber is isolated from the second fluid chamber, and a disengaged position in which the first fluid chamber is not isolated from the second fluid chamber.

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: A two stage master brake cylinder uses a primary and secondary piston to displace an initial large volume of hydraulic fluid during a first stage and a second stage that continues brake actuation by displacing a reduced volume of hydraulic fluid determined by the secondary piston. A by-pass control valve is adjustable to vary transition from the first stage to the second stage.

Abstract: Brake apparatus includes a transmission unit for operatively connecting a brake pedal to a master cylinder, and the transmission unit is a mechanism capable of varying a ratio between an output amount of a push rod connected to a master cylinder and an operation amount of the brake pedal. Further, the transmission unit is constructed in such a manner that, in an initial operation region of the brake pedal, a ratio of the operation amount of the brake pedal to the output amount of the push rod is set to be greater than in another operation region immediately following the initial operation region.

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: A master cylinder comprising a large diameter pressurizing chamber and a small diameter hydraulic chamber, a control valve device in which a control valve body releases a hydraulic pressure in the large diameter pressurizing chamber to a reservoir side such that the hydraulic pressure in the large diameter pressurizing chamber is gradually reduced in accordance with a rise in a hydraulic pressure in the small hydraulic chamber, and a check valve device comprising a check valve chamber communicating with an relief passage, which releases a hydraulic pressure in the large diameter pressurizing chamber to the reservoir via the control valve device, and with a small diameter hydraulic chamber, respectively, and a check valve body accommodated in the check valve chamber for permitting flow of a brake fluid from the relief passage to the small hydraulic chamber, and for preventing flow of the brake fluid in a reverse direction.

Abstract: A drivetrain for a motor vehicle has a friction clutch for transmitting drive torque for the motor vehicle and has an actuator arrangement for actuating the friction clutch. The actuator arrangement has a first actuator which is designed to close the friction clutch quickly with little force expenditure in order to thus quickly close up the play which is present in the open state of the friction clutch. The actuator arrangement has a second actuator which is designed such that, with a small stroke, it applies a large force for actuating the friction clutch in order to keep the friction clutch closed with little energy expenditure.

Abstract: A master cylinder suitable for a vehicle braking system has an unusual capability to supply quantities of fluid and fluid pressures at its output in differentiated manner in dependence on the braking stage, preventing long transitory stages between an approach stage and an actual braking stage. The cylinder comprises a cylinder body having a first chamber and a second chamber provided inside. The first chamber is in operative communication with at least one braking member and houses a first piston. The second chamber, which has larger transverse dimensions than the first chamber, is in operative communication with the first chamber and houses a second piston. Ducts are provided and put the first chamber and the second chamber into communication during the approach stage. The ducts house a low-pressure valve which is open during the approach stage and closed during the actual braking stage.

Abstract: A master cylinder having a housing with first and second bores that are connected to a same circuit in a braking system. A first piston is sealingly retained in the first bore to define a first chamber and a second piston is sealingly retained in the second bore to define a second chamber. The first piston has of a first cylindrical member that is connected to a second cylindrical member by a shaft. The shaft includes an actuation and a retraction ramp that terminate at an apex. An input force applied to the second cylindrical member is directly applied through the shaft to the first cylindrical member and through the actuation and retraction ramps to the second piston to respectively communicate fluid simultaneously to the same circuit.

Abstract: A master cylinder that can sufficiently compensate for an ineffective fluid amount at an initial stage of a stroke, even at a time of sudden braking in a case where a hydraulic control unit is disposed between the master cylinder and a brake device, is provided. The master cylinder includes a control valve that releases hydraulic pressure in a large diameter pressurizing chamber to a reservoir side when the hydraulic pressure in the large diameter pressurizing chamber reaches a fluid-release pressure corresponding to hydraulic pressure introduced via a branched flow path that branches from a communication flow path that connects a hydraulic control unit and a small diameter hydraulic chamber. A restrictor is disposed in the branched flow path for introducing the hydraulic pressure to the control valve.

Abstract: A variable ratio of force-enlargement master cylinder for a braking system is described. The variable ratio of force-enlargement master cylinder has a cylinder, an outer piston, and an inner piston, in which comprise a plurality of cavities and openings therein. When a force is uniformly applied to the variable ratio of force-enlargement master cylinder, the flow rate of the fluid is preferably changed into a predetermined value by incorporating the cavities and openings located on the cylinder, the outer piston, and the inner piston in a suitable time.

Abstract: A master cylinder of the invention supplies a brake fluid from a large diameter pressurizing chamber 56 to a small diameter hydraulic chamber 49 by opening a reverse flow checking opening and closing portion 61 by sliding movement of a stepped piston 16 forwardly, that is, fast fill and when the hydraulic pressure of the large diameter pressurizing chamber 56 rises, a control valve 86 escapes the hydraulic pressure of the large diameter pressurizing chamber 56 to a reservoir 12 to gradually lower in accordance with rise of the hydraulic pressure of the small diameter hydraulic chamber 49, thereby capable of reducing a strange feeling in a pedal feeling caused by sudden pressure release of the large diameter pressuring chamber 56.

Abstract: A two-stage brake valve, has a pair of stages with different effective areas which become effective in succession upon an actuation of the valve, including a larger area fill chamber and a smaller area pressure chamber. A fill stage pressure relief valve is connected between the fill chamber and a reservoir. The relief valve includes a valve element, which is exposed to the pressure in the reservoir and spring force, and which is exposed to pressure in the fill chamber, so that it opens upon a pre-set brake pressure existing in the fill chamber. The relief valve also includes a pressure relief piston which can be exposed to the pressure in the fill chamber, and which can be exposed to the pressure in the pressure chamber. The piston has a free end which engages the valve element, and forces the valve element in its opening direction with increasing pressure difference between the pressure chamber and the fill chamber.

Abstract: The object of the present invention is to exhibit the function of a throttle valve mechanism without making the whole of a master cylinder large-sized and to simplify the structure and to reduce the number of pieces of parts. In order to attain this object, the present invention has throttle valve mechanisms with a floating valve body which sits and throttles the flow of the hydraulic fluid to the reservoir from the pressure generating chambers when the pistons operate and which opens when the pistons do not operate, and the throttle valve mechanisms are arranged in the fluid passage for the supplementation of the hydraulic fluid, and the throttle valve mechanisms have a floating valve body with a throttle passage and a valve seat with and from which the floating valve body is brought into contact and is separated, and the valve seat is provided at the tip of the connecting portions to the cylinder body of the reservoir.

Abstract: A two-stage brake valve, has a pair of stages with different effective areas which become effective in succession upon an actuation of the valve, including a larger area fill chamber and a smaller area pressure chamber. A fill stage pressure relief valve is connected between the fill chamber and a reservoir. The relief valve includes a valve element, which is exposed to the pressure in the reservoir and spring force, and which is exposed to pressure in the fill chamber, so that it opens upon a pre-set brake pressure existing in the fill chamber. The relief valve also includes a pressure relief piston which can be exposed to the pressure in the fill chamber, and which can be exposed to the pressure in the pressure chamber. The piston has a free end which engages the valve element, and forces the valve element in its opening direction with increasing pressure difference between the pressure chamber and the fill chamber.

Abstract: A brake apply system includes a modulator that has a first bore carrying a power driven dual-effect piston. The piston has a base piston surface and an augmentation piston surface. A wheel brake is hydraulically connected to the modulator through an open fluid communication route that is provided between the wheel brake and the base piston surface. A selectively open fluid communication route is provided between the wheel brake and the augmentation piston surface with a check valve mechanism positioned in the selectively open fluid communication route. An augmentation chamber is defined adjacent the augmentation surface of the dual-effect piston. The modulator includes a second bore carrying a valve mechanism that provides an open flow path between the augmentation chamber and a reservoir when pressure at the wheel brake is relatively high and that significantly restricts the flow path when the wheel brake pressure is relatively low.

Abstract: A brake booster for a brake system of a vehicle, wherein the brake booster is in fluid communication with a source of pressurized fluid. The brake booster includes a housing having a bore formed therein and a conduit formed therein being in fluid communication with the bore and the source of pressurized fluid. The brake booster includes first and second pistons slidably disposed within the bore of the housing. The bore, the first piston, and the second piston define a fluid chamber in fluid communication with the conduit formed in the housing, wherein the volume of the chamber is defined by the position of the first piston relative to the second piston. The brake booster further includes a valve selectively preventing fluid flow in a direction from the chamber to the source of pressurized fluid via the conduit.

Abstract: Hydraulic braking system with slip control, comprises a working piston guided within the brake pressure generator, a booster piston of a hydraulic brake force booster for actuating the working piston, at least one wheel brake connected to the brake pressure generator and an electrically operable auxiliary pressure source adapted to be connected to the brake force booster, a control and regulating electronic unit for detecting the wheel rotating pattern and for controlling the wheel brake pressure by means of pressure modulating valves, and an electronic sensor means for detecting the relative movement between the push rod and the booster piston, the output signals of which sensor means are capable of influencing the operation of the auxiliary pressure source, wherein the auxiliary pressure source includes a quick-fill piston which is guided within a servo cylinder arranged on a servo drive.

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 master cylinder having, in addition to a main pressurizing chamber, a fast-fill pressurizing chamber to quickly force, while pedal effort is minimal, brake pads or shoes from initially retracted positions to positions where the pads or shoes are in contact with corresponding brake disks or drums. The present master cylinder uses no fixed brake fluid flow restriction valves to vent brake fluid from the fast-fill pressurizing chamber once contact is made, pedal travel being made thereby independent of the rate of applied pedal effort.

Abstract: An actuating unit for a hydraulic brake system for automotive vehicles which operates by a precisely defined change-over pressure and with lost travel independent of the speed of actuation. The actuating unit includes a pneumatic brake power booster and a master brake cylinder connected downstream of the pneumatic brake power booster. The master brake cylinder contains a primary piston coupled with an annular piston of larger diameter. The annular piston confines a filling chamber which may be connected to the hydraulic pressure chamber. The annular piston is adapted to uncouple from the primary piston when the pressure acting on the annular piston reaches a predetermined amount. Thus, the displacement of the filling volume by the annular piston does not require an entire stroke of the master brake cylinder.

Abstract: A two-stage brake valve includes a stepped valve bore and pressure piston defining a first stage with a large effective area and a second stage with a smaller effective area. The two stages become effective in succession so that, initially the first stage is used to fill a system and then, following a transitional phase, the second stage generates an operating pressure. A relief channel communicates the pressure chamber of the first stage with a reservoir. A relief valve closes the relief channel in response to an excess pressure generated by operation of the second stage.

Abstract: According to an illustrative example of the invention, a foot pedal acts upon a first master cylinder and with delay upon a second master cylinder. Both master cylinders are connected with a slave cylinder which acts upon a clutch releaser. In a first range of movement adjacent the clutch engagement condition, the foot pedal acts only upon the first master cylinder such that there is a small transmission ratio between the movement of the clutch pedal and the movement of the clutch releaser. In as second range of movement subsequent to the first range of movement, the clutch pedal acts upon both master cylinders so that there is a higher transmission ratio between the movement of the clutch pedal and the movement of the releaser.

Abstract: An oleopneumatic load intensifier apparatus for creating a rapid advance of a tool carrying rod followed by slow advance of the piston rod at an increased load. The apparatus has a master cylinder and an actuating cylinder that can assume different positions with respect to the master cylinder while maintaining fluid communication therewith. An enclosed hydraulic system is shared by the master and actuating cylinders. Pneumatic pressure actuates a piston within the master cylinder that causes a rapid advancement of a hydraulically fed piston within the actuating cylinder, causing a piston rod and a tool associated therewith to contact a workpiece. Pneumatic pressure then causes a piston and associated piston rod, located in the master cylinder, to increase the hydraulic pressure in the line to the hydraulically fed piston located within the actuating cylinder, thus, increasing the load delivered to the workpiece.

Abstract: A hydraulic brake system comprising a master brake cylinder (10), a brake force booster (12) and a filling chamber (38) by means of which in the initial phase of a brake actuation the brake system on relatively short pedal travel is rapidly filled with hydraulic brake fluid up to a predetermined switch-off pressure, the filling chamber (38) being in conductive communication with a primary chamber (22) of the master brake cylinder (10) and connectable to a hydraulic fluid reservoir (62) via a first valve (82) which closes when the brake force booster (12) is functioning and a pressure obtains in the hydraulic fluid below the switch-off pressure and opens when the brake force booster is not functioning, is characterized in that in the connecting conduit (60, 72, 74, 78) between the filling chamber (38) and the primary chamber (22) a second valve (76) is arranged which closes at a pressure in the hydraulic fluid above the switch-off pressure.

Abstract: A brake control valve has a valve bore, a piston member and an end member closing one end of the valve bore. One of the piston and end members has a projection and the other member has a corresponding blind bore for sealingly receiving the projection. The blind bore and the projection are spaced apart axially in the rest position of the piston. Upon axial movement of the piston the projection is sealingly received by the blind bore so that the effective working area of piston is reduced. By means of appropriate channels and grooves the chamber surrounding the projection is connected to reservoir.

Abstract: In a booster casing (12) a movable wall (14) separates two compartments (16,18) from each other. In inoperative position, a control valve (20) connects the two compartments (16,18) with each other, and separates them when in an operative position, connecting one (16) of them to a source of pressure which differs from the pressure in the other compartment (18). A cylinder casing (52) is attached to the booster casing (12), projects into the same, and contains at least one pressure piston (54) which defines a pressure chamber (56) for pressurizing a brake circuit. An input piston (40) having a greater effective surface than the pressure piston (54) and defining an input chamber (42) is movable together with the movable wall (14). The input chamber (42) is adapted to be relieved of pressure by a relief valve (80) if the booster (10) fails. The input piston (40) and chamber (42) are arranged inside the booster casing (12), and the input piston (40) forms part of the movable wall (14).

Abstract: A two stage relief valve for a quick-fill master cylinder (10). The two stage relief valve (54) has a ball (88) that is biased against a first seat (82) to control the flow of fluid from a quick-fill chamber (30) and a unitary structure (55, 74) which is biased against a second seat (70) to further control the flow of fluid from the quick-fill chamber (30). A first predetermined fluid pressure moves the ball (88) off the first seat (82) to allow fluid to escape from the quick-fill chamber (30). A second predetermined fluid pressure moves the unitary structure (55, 74) to allow additional fluid to escape and thereby limit the fluid pressure development in the quick-fill chamber (50).

Abstract: A master cylinder (10, 210, 310, 410) includes a housing bore (14) having at one end (16) a bearing member (18) attached thereto and retaining a sleeve member (20) within the bore (14). One piston (30, 230, 530) has at one end (32, 232) thereof a fast fill mechanism (150, 350, 450). The fast fill mechanism (150, 350, 450) includes a seal support (130, 330, 430), fast fill seal (160, 360, 460), a ramp (132, 332, 432) on the fast fill seal support (130, 330, 430), and a ramp (125, 325, 425, 525) at the one end (32, 232) of the piston. The ramp (125, 325, 425, 525) at the one end (32, 232) of the one piston (30, 230, 530) may be disposed within the piston (230, 530, 441) or on a flange support (120) mounted on the one piston (30).

Abstract: A pneumatic-hydraulic booster for vehicle includes a master cylinder part; a pneumatic cylinder part combined with the master cylinder part which includes a power piston slidable fitted to a cylindrical casing and an output rod fixed to the power piston, extending to the master cylinder part; a partition wall body fitted to the cylindrical casing; and a relay valve part arranged at the opposite side of the partition wall body from the power piston in the cylindrical casing. The relay valve supplies compressed air into an air pressure chamber formed between the partition wall body and the power piston and discharges the compressed air from the air pressure chamber to the atmosphere. When compressed air is suppplied into the air pressure chamber through the relay valve part the power piston and the output rod are moved forwards to generate hydraulic pressure in the master cylinder. The hydraulic pressure is applied to a wheel cylinder for braking.

Abstract: A pneumatic-hydraulic booster for vehicles includes a master cylinder part; a pneumatic cylinder part combined with the master cylinder part including a power piston slidably fitted to a cylindrical casing and an output rod fixed to the power piston, extending to the master cylinder part; a partition wall body fitted to the cylindrical casing; and a relay valve part being arranged at the opposite side of the partition wall body to the power piston in the cylindrical casing. The relay valve supplies compressed air into an air pressure chamber formed between the partition wall body and the power piston and discharges the compressed air from the air pressure chamber to the atmosphere. When compressed air is supplied into the air pressure chamber through the relay valve part, the power piston and the output rod are moved forwards to generate hydraulic pressure in the master cylinder part. The hydraulic pressure is applied to a wheel cylinder.

Abstract: A hydraulic brake system comprising a pedal-operated brake booster (5), which is connected with the master cylinder (3) and includes an auxiliary pressure supply system (13), a booster piston (4), and a booster chamber (7) wherein an auxiliary pressure is established which is proportional to the foot pressure (F). The hydraulic brake system is provided with wheel brakes (14,15,16,17) connected to the master cylinder (3), a filling stage cylinder (18) is provided which displaceably houses a two-stage piston (20). A pressure chamber (21) is arranged in front of the large stage (83) of the two-stage piston (20) and a filling chamber (22) is arranged in front of the small stage (84) of the two-stage piston (20). In this arrangement, the filling chamber (22) communicates with one of the working chambers (26) of the master cylinder (3) and/or a brake line (28) by way of a pressure line (25).

Abstract: The master cylinder (10) comprises a housing (12) having a longitudinal bore (14), a housing end (16) enclosed by a bearing member (18) which retains a sleeve member (20) within the bore (14), a reservoir (70) mounted on the housing (12) and a pair of pistons (30, 40) received slidably within the bore (14), one piston (30) extending through an end (24) of the sleeve member (20). The one piston has an end (32) which provides seating for a fast fill valving mechanism (110). The fast fill valving mechanism (110) comprises a piston support guide (120) supporting a fast fill seal (150) and seal retainer (160) between the support guide (120) and the surface (23) of the sleeve member (20). The seal retainer (160) engages one end (142) of a spring (140), the other spring end (143) located at the end (32) of the piston.

Abstract: A master cylinder has a piston slidably fitted in a stepped cylinder bore including a first pressure chamber connected through a coupling hole to a reservoir. When a fluid pressure in the first pressure chamber is increased to a predetermined level at the time the piston is moved forward, a second valve disposed in the coupling hole is opened to release a fluid pressure from the first pressure chamber into the reservoir. When a negative pressure is developed in the first pressure chamber as the piston is moved back, a first valve in the coupling hole is opened to supply a fluid from the reservoir into the first pressure chamber.

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: A braking pressure generator (1,21) for a vehicular hydraulic brake system, wherein a booster piston (15) which is slidable by hydraulic pressure is displaceable in the actuating direction. The booster piston (15) is arranged as a stepped piston with a smaller-diameter portion (16) close to the pedal. The booster piston (15) includes a blind-end bore remote from the pedal in which a master cylinder piston (43) is sealedly guided, wherein the smaller-diameter portion (16) of the booster piston (15) confines an annular chamber (18) diminishing upon brake application. A valve (30) is connected to the annular chamber (18) controllable by the pressure in the pressure chamber (14) of the hydraulic power booster. The valve closes a connection between the annular chamber (18) and an unpressurized supply reservoir (9). A direct connection can be established between the annular chamber (18) and the working chamber (22) by way of the valve (30) and by circumventing a sealing collar.

Abstract: For attaining an abrupt change in ratio, in a slip-controlled brake system for automotive vehicles, the chamber (11) of a fast-fill cylinder (4) is connected to a plunger chamber (41) of the braking pressure generator (1) which is acted upon by the booster piston (40), while the pressure line (7) leading from the plunger chamber (41) to the fast-fill cylinder (4) contains a pressure-controlled directional control valve (8) governing a pressure-fluid conduit to the pressure-supply reservoir (31). The annular chamber (50) of the fast-fill cylinder (4) is connected by way of a return line (55) to the pressure-supply reservoir (31) and with the prechamber (18) of the master cylinder (15) by way of a pressure line (56), while a pressure-controlled two-way/two-position directional control valve (9) with a non-return valve connected in parallel thereto is arranged in the return line (55).

Abstract: The master cylinder (10) comprises a housing (12) having a longitudinal bore (14), an end (24) enclosed by a bearing member (18) which retains a sleeve member (20) within the bore (14), a reservoir (70) mounted on the housing (12) and a pair of pistons (30, 40) slidably received within the bore (14), one piston (30) extending through the end (24) of the sleeve member (20). The one piston (30) has a reduced diameter end (32) which provides seating for a fast fill valving mechanism (110). The fast fill valving mechanism (110) comprises a fast fill seal (120) having a flexible arm (122) engaging an interior surface of the sleeve member (20) and the sleeve member (20) having longitudinal grooves (22) adjacent the arm (122), a fast fill spring member (140) trapped between the fast fill seal (120) and a land member (130), the land member (130) having pockets (132) covered by the fast fill spring member (140) and the pockets (132) communicating with passages (133) in the land member (130).

Abstract: A master cylinder of the quick-fill type has a pressure cylinder, a reservoir mounted thereon and a quick-fill chamber. The reservoir forms a compartment housing valve means controlling communication between the quick-fill chamber and reservoir.

Abstract: A hydraulic brake system (FIG. 2) composed of a master cylinder (30) coupled to the brake pedal (46), wherein there is provided a hydraulic booster (31) with a booster piston (91) and a booster chamber (35), and an auxiliary pressure proportional to the pedal force (F) develops in the booster chamber (35) during braking by way of a brake valve (6) actuated by the brake pedal (46). With the booster (31) intact, the auxiliary pressure prevailing in the booster chamber (35) acts by way of a pressure line (85, 87) on the two-stage piston (20) of a fast-fill cylinder (18), whose small stage (95) is immersed into a filling chamber (22) and, during the brake action, presses the pressure fluid available in the filling chamber (22) by way of pressure line (33) into the one brake line (37) connected to the working chamber (34) of the master cylinder (30).

Abstract: A master cylinder of the quick-fill type has an open-ended pressure cylinder closed by a closure member and a reservoir mounted on the cylinder. The closure member partially defines a quick-fill chamber in which slides a piston connected to a piston of the pressure cylinder. A valve controls communication between the quick-fill chamber and the reservoir.

Abstract: In a master cylinder of the quick-fill type, communication between the quick-fill chamber (8) and the reservoir (13) is controlled by a valve assembly comprising a pressure responsive valve which opens when the pressure in the quick-fill chamber (8) reaches a predetermined level, and a one-way valve (20, 22) which allows free flow of fluid from the reservoir to the quick-fill chamber. The valve member (20) and seat (15) of the pressure responsive valve have confronting surfaces which define between them, when the valve is closed, a restrictive passage for pressure equalization purposes, and any dirt becoming trapped between the surfaces is washed away by the fluid flow on opening of the valve.

Abstract: An improved quick fill type master cylinder having a structure in which a piston consisting of a smaller diameter piston portion and a larger diameter piston portion is slidably fitted into a stepped cylinder bore to define a hydraulic pressure chamber as well as a hydraulic oil supply chamber therein, a relief port opening to the hydraulic pressure chamber and a supply port opening to the hydraulic oil supply chamber are placed in communication with an oil reservoir via a hydraulic oil flow passage formed longitudinally in a cylinder casing, and a valve device is incorporated in the hydraulic oil flow passage. The hydraulic oil flow passage is formed by drilling and the like from the rear end face of the cylinder casing and a valve chamber of the valve device is provided in the oil flow passage near outside opening thereof.

Abstract: The present invention starts from a vehicle hydraulic brake system comprising a master cylinder (2) actuatable by a hydraulic power booster (1) and containing a working chamber (12, 21), to which latter wheel brakes (36, 37, 38, 39) are connected by way of valves (40, 41) controllable by a slip control electronics. On control action, pressure fluid can be taken from the wheel brakes (36, 37, 38, 39) through the valves (40, 41) and can be replenished out of the presser chamber (5) of the hydraulic power booster (1) by way of the working chamber of the hydraulic power booster by way of the working chamber (12, 21). On communication of the working chamber (12, 21) with the pressure chamber (5) of the hydraulic power booster (1), simultaneously, a resetting sleeve (11) is pressurized in the brake's release direction which is penetrated by a master cylinder piston (10) and which serves to limit the stroke of the brake pedal (6).

Abstract: A master cylinder of the invention supplies a brake fluid from a large diameter pressurizing chamber 56 to a small diameter hydraulic chamber 49 by opening a reverse flow checking opening and closing portion 61 by sliding movement of a stepped piston 16 forwardly, that is, fast fill and when the hydraulic pressure of the large diameter pressurizing chamber 56 rises, a control valve 86 escapes the hydraulic pressure of the large diameter pressurizing chamber 56 to a reservoir 12 to gradually lower in accordance with rise of the hydraulic pressure of the small diameter hydraulic chamber 49, thereby capable of reducing a strange feeling in a pedal feeling caused by sudden pressure release of the large diameter pressurizing chamber 56.