Abstract: A hydraulic actuating and locking device includes a locking piston within a cylinder, an actuating piston within a cylinder in the rear surface of the locking piston and a pressure multiplier connected to the space behind the piston. A passage, constituting a high pressure cylinder, connects the space behind the piston to an oil reservoir and is adapted to receive and be sealed by the high pressure piston of the pressure multiplier.

Abstract: A brake master cylinder, having a body, with an attached brake booster which includes first and second pneumatic pressure chambers provided in a booster housing, a power piston defining the first and second chamber therebetween, a first valve mechanism provided within the power piston and generating a pressure difference between the first and second chambers in response to the operation of an associated brake pedal, first and second hydraulic pressure chambers provided in the master cylinder body, a primary piston disposed in the first hydraulic pressure chamber operably connected to the power piston, a first passage member communicating the second hydraulic pressure chamber with a brake wheel cylinder, a second passage member communicating the first hydraulic pressure chamber with a reservoir, a second valve mechanism controlling the communication between the second passage member and the reservoir upon slidable movement with the primary piston, a third valve mechanism provided within the primary piston and

Abstract: A split-type brake master cylinder for motor vehicles comprises a stepped bore, a stepped primary piston to constitute a first fluid chamber between a large diameter portion and a small diameter portion thereof, a secondary piston to form a primary pressure chamber in cooperation with the primary piston as well as a second fluid chamber in normal fluidic communication with a reservoir, and a compensation port continuously connected to the primary pressure chamber and in the fluidic connection to the second fluid chamber at the brake release condition while in the fluidic isolation therefrom at the brake application. Thus, the compensation port has no direct relationship with the pressure increase in the first fluid chamber thereby to assure the stable output pressure of the master cylinder regardless of the depression speed of brake pedal.

Abstract: A master cylinder for a vehicular brake includes a cylinder closed at one end and open at the other end, a sleeve slidably received within the cylinder, a piston assembly including a pair of pistons integrally connected together, a stop on the cylinder for confining the piston assembly within the cylinder, and a spring disposed between the sleeve and piston assembly for normally biasing one end of the sleeve against the closed end of the cylinder and the piston assembly against the stop. One of the pistons and the closed end of the cylinder define a first pressure chamber therebetween and the pistons define a second pressure chamber therebetween. In operation, the sleeve is moved towards one of the pistons in response to a difference in the amount of remaining oil between the two pressure chambers against the force of the spring.

Abstract: The present invention relates to a brake master cylinder device including a first and a second cylinder bore formed within a body. A piston member is formed with a first piston and a second piston, which are respectively engaged with the first and the second cylinder bores to define a first and a second cylinder chamber, the arrangement being such that when the piston member is moved in a certain direction the volumes of both the first and the second cylinder chambers are reduced together. The piston member is biased in the direction opposite to said certain direction. A fluid conduit opens from the second cylinder chamber for connection to a brake actuator. A first one way valve always allows fluid to flow freely from the first to the second cylinder chamber. A second one way valve allows fluid to flow from a fluid reservoir, within which fluid is kept at atmospheric pressure, to the first cylinder chamber, when the pressure in the first cylinder chamber is below atmospheric pressure.

Abstract: A master cylinder for actuating a hydraulic cylinder for a hydraulic brake or clutch. The master cylinder includes a cylinder body having a cylinder bore defined therein. The cylinder bore is in communication with an oil tank by way of a supply port and a relief port formed through the wall of the cylinder bore in axially spaced relation from each other. A piston is slidably received in the cylinder bore to define a hydraulic chamber forwardly thereof and comprises a pair of forward and rear piston portions axially spaced apart from each other with an annular seal member disposed therebetween. A cup support is integrally formed with the forward piston portion forwardly thereof and has a radially outer peripheral surface facing the inner peripheral surface of the cylinder bore with an annular clearance formed therebetween.

Abstract: A servo booster is provided with a tube coaxial with the booster output rod for relieving the booster housing of braking reaction forces. The housing of a tandem master cylinder has an externally threaded rear end which is threadedly engaged with internal threads formed on a reduced diameter front part of the tube. The retracted position of the primary piston of the master cylinder is determined by abutment with the booster output rod, and this can be adjusted by turning the master cylinder housing relative to the tube.

Abstract: A master cylinder which is mainly adapted for a motorcycle and which is shortened in axial length in comparison with conventional master cylinders by eliminating a secondary cup for easy mounting on a handle-bar without interference with meters on the handle-bar.

Abstract: A fluid pressure generator, such as a master cylinder, includes a housing with a bore for movably supporting a pair of pistons. The pair of pistons cooperate with the housing and with each other to substantially define a pair of pressure chambers which are communicated with respective brake assemblies. A first piston of the pair of pistons is movable within the housing to pressurize a primary pressure chamber and the second piston of the pair of pistons is movable in response to pressurized fluid within the primary pressure chamber so as to pressurize a secondary pressure chamber. The second piston carries a valve assembly and includes a passage to provide fluid communication between the secondary pressure chamber and its respective brake assembly.

Abstract: A master cylinder assembly has a low pressure, high volume displacement quick take-up chamber and a high pressure, low volume displacement pressurizing chamber formed by a stepped bore and a stepped piston. A compensation control and blow-off valve unit has a peripheral lip seal type valve providing compensation flow on brake release but preventing flow from the quick take-up chamber during brake apply. A normally closed check valve can open to provide communication between the quick take-up pressurizing chamber and the fluid reservoir. When the pressurizing cup for the high pressure chamber closes its compensation port, the check valve is subjected to the pressure in the quick take-up pressurizing chamber. Initial fluid flow is obtained from the quick take-up chamber past the pressurizing cup into the high pressure chamber.

Abstract: The invention relates to motor vehicle reservoir and master cylinder assemblies in which a hydraulic master cylinder can be mounted onto the vehicle in a large number of attitudes with respect to the vehicle without the limitation of maintaining the reservoir in an upright position. The reservoir is mounted directly onto the master cylinder by an adjustable means so that the attitude of the reservoir can be readily selectively adjusted relative to the master cylinder to ensure that the reservoir is substantially upright.

Abstract: A servo brake system with at least two circuits, equipped with a tandem master cylinder, in which two working pistons are arranged coaxially one behind the other; a transmission shifting device thereby automatically shifts in case of failure of the servo installation to a larger pedal travel with a mechanically applied brake pressure that is reduced within permissive limits; the working piston of the actuating side thereby includes a bore coaxial to the other working piston, in which a plunger piston is guided which is actuatable by the input piston.

Abstract: A tandem master cylinder assembly for use in split-type hydraulic brake systems of an automotive vehicle, comprising a fluid reservoir, a cylinder body having a cylinder bore communicable with the fluid reservoir through two ports formed in the cylinder body, primary and secondary pistons axially slidable as a single unit in the cylinder bore, a floating piston axially movable within the secondary piston and forming, jointly with the primary and secondary pistons, primary and secondary pressure chambers which are variable in volume depending upon the axial positions of the primary and secondary pistons relative to the cylinder body and the axial position of the floating piston relative to the cylinder body and to the secondary piston, and means to limit the distance of travel of the floating piston relative to the cylinder body.

Abstract: A device comprising two oil reservoir tanks communicating with the two respective oil-hydraulic chambers of a tandem type master cylinder and also with each other through an upper and a lower interconnecting oil passage. One of the two tanks has a top opening for oil filling use and normally closed with a vented cap while the other tank is closed at the top and provided therein with an oil level detector means which comprises a stationary reed switch connected with an appropriate external alarm circuit and a permanent magnet vertically movable with the oil level in the tank to close the reed switch as the volume of oil stored is reduced to a predetermined minimum. With the device, even if one of the two oil-hydraulic lines connected with the master cylinder fails to function due to oil leakage, the other line can properly function without any pressure failure as, in the associated tank, a predetermined minimum volume of oil remains on account of the height of the lower oil passage.

Abstract: An auxiliary compensating piston in a tandem automotive master cylinder containing two pressure pistons closes relief port holes between the cylinder and brake fluid reservoirs. A compensating valve feeds replacement fluid into the cylinder during brake release. The auxiliary compensating piston opens the relief port holes at the end of brake release to relieve excess brake fluid from the cylinder.

Abstract: Apparatus for hydraulic control of friction brakes of an automobile vehicle which comprises a first master-cylinder directly connected to the hydraulic brake circuit and operated by the driver's brake pedal and a second master-cylinder operated by release of the gas pedal, and connected to the first master-cylinder in place of the reservoir thereof. The first master-cylinder is a tandem master-cylinder which comprises a first piston connected by the intermediary of a linkage to the brake pedal and a second piston dividing the interior of the first master-cylinder into first and second chambers. The first chamber is located between the two pistons and is connected to a first hydraulic brake control-circuit, while the second chamber is situated at an end of said cylinder and is connected to a second hydraulic brake control-circuit. The two chambers are supplied with liquid.

Abstract: A sealing device is mounted in the bore of a housing in which a piston is slidably mounted. A fluid tight seal is mounted between a shoulder of the housing and a washer circumscribing the piston. The washer has an outer diameter substantially equal to that of the bore and comprises an outer annular groove in which at least one fixing element is disposed. Each fixing element comprises a tongue-shaped portion penetrating through a corresponding radial bore defined at the bottom of the annular groove. When the piston is inserted through the washer, the fixing elements are moved radially towards the outside of the washer through the tongue-shaped portions and penetrate into a facing annular groove formed in the bore.

Abstract: Master cylinder reservoir comprising a housing having two adjacent reservoir sections separated by a transversely extending double wall partition having windows offset laterally from one another with a space between the walls.

Abstract: A reservoir in a master cylinder for use in a vehicle braking system comprising two or more barrier plates vertically spaced and fitted in the reservoir to partition the interior of the reservoir into three or more chambers. Each of the plates has one or more through holes for restricting fluid flow across the plate, thereby preventing ingress of air bubbles into pressure chamber of the master cylinder.

Abstract: The hydraulic master-cylinder of the invention is of the kind having a valve ring made of elastomeric material mounted on the head of a piston adjacent to the pressure chamber. The master-cylinder further includes a safety valve in the pressure chamber. The safety valve is guided on the piston head and is adapted to sealingly cooperate with both one face of the valve ring and a shoulder provided on the piston head. The safety valve is biased toward the valve ring by a spring abutting on a stop fixed relative to the piston.

Abstract: A master cylinder of the dual pressurizing chamber type for pressurizing brake fluid in separate brake actuating circuits has the primary piston reciprocably mounted in a stepped bore so that the piston rear land moves within a larger bore section than does the piston front land. The secondary piston moves in the same bore section as does the primary piston front land, and has a pair of spaced lands with oppositely facing lip seals. The front land of the primary piston is also provided with a lip seal. These seals operate to permit the build-up of pressure in the pressurizing chambers located on either side of the secondary piston, while permitting fluid to flow past the seals into the pressurizing chambers when the chambers adjacent the pressurizing chambers are producing a greater pressure than that being produced in the pressurizing chambers.

Abstract: A master cylinder having an indicator activated by either a low level fluid condition in a reservoir or any operational pressure imbalance between first and second fluid distribution systems of a master cylinder to inform an operator of an adverse condition which could affect braking.

Abstract: A master cylinder assembly includes a cylinder having a large-diameter portion and a small-diameter portion. A piston body is slidably positioned within the cylinder, a front and a rear pressure chamber are provided. A first compensation port controls communication between a fluid reservoir and one of the pressure chambers. A large piston is slidably mounted around the piston body and cooperates with a second compensation port to control communication between the fluid reservoir and a brake fluid operating chamber. The piston body has a bore extending axially therethrough providing continuous fluid communication from the front pressure chamber to the rear pressure chamber.

Abstract: The control valve for a two stage servomotor used in a braking system. A two stage servomotor has a housing with a stepped bore therein for retaining a piston and a cylindrical body. A deformable member adjacent the cylindrical body transmits a first operational input into the piston. A first operational input moves the piston and produces a pressure signal. The first operational input and the resistance to movement by the piston changes the shape of the deformable member. The changes in the shape of deformable member moves the control valve and allows the pressure signal to be communicated to the cylindrical body. The pressure signal acting on the cylindrical body provides an additional second operational force for moving the piston.

Abstract: A control system for connecting a manually actuated lever to an arm of a fluid translating device that forms part of the drive transmission for a skid steer vehicle is disclosed herein. The connection between the lever and the arm is in the form of a hydraulic fluid connection that includes master and slave cylinder and piston assemblies with the master cylinder and piston assembly connected to the lever and the slave cylinder and piston assembly connected to the control arm. The opposite ends of the respective cylinders on opposite sides of the respective pistons are interconnected by fluid conduits to define first and second chambers and both pistons are biased to a centered neutral position.

Abstract: A master brake cylinder comprises a spring biased piston reciprocally mounted in a bore defined in a housing thereof. A cup seal, disposed in the bore to abut the piston, comprises a flexible annular flange portion having a plurality of circumferentially disposed grooves formed thereon to induce rotation of the cup seal upon the return stroke of the piston, subsequent to a braking operation. The cup seal is composed of a cured elastomeric material having a cup-shaped reinforcing fabric encapsulated therein.