Alliedsignal Inc.

Robert Boschgmbh

Allied Corporation

The Bendix Corporation

Robert K Wilson

Donald A Crumb

Timothy Jay Albert

William John Penninger

Kenneth S Towers

Dean E Runkle

Richard Becker McClain

Jerome T Ewald

William E Monroe

Hugh E Keyes

A hydraulic brake booster has an actuator arrangement for a control valve that includes a ball that is located in a first sleeve retained in a stepped bore of a cylindrical member and a pin that is retained in the cylindrical member. The pin has a first end that is located in an actuation chamber and is connected with a first input member and a second end that extends into the stepped bore to engage the ball. The first end on receipt of a first input force initially moves the pin and ball from a position of rest to interrupt fluid communication between the actuation chamber and a reservoir and thereafter moves the sleeve to selectively initiate metered communication of pressurized fluid to the actuation chamber that acts on a first piston to effect a first brake application of a wheel brake. A second sleeve that surrounds the pin has a lip on a first end that engages the cylindrical member to position a second end thereon in an auxiliary actuation chamber within the housing of the brake booster. The second sleeve responds to a second input force derived from pressurized fluid being presented to the auxiliary actuation chamber as a function of a second input by acting on the second end of the second sleeve to move the first end into engagement with the ball and move the ball from a position of rest to interrupt fluid communication between the actuation chamber and the reservoir and thereafter move the first sleeve to communication of pressurized fluid to the actuation chamber that acts on the first piston as a function of the second input to independently effect a second brake application of a wheel brake.

Hydraulic brake booster

A hydraulic brake booster for use in a brake system having a housing with a power piston located in a first bore and a control valve located in a second bore. An input member is connected to the power piston and linked to the control valve by a lever arrangement. The input member is characterized by a cylindrical body with a shaft attached thereto. A bracket with a radial opening is carried by the shaft and urged toward a head on the shaft by a spring. The lever arrangement is characterized by a first lever with a first end pivotally secured in the housing by a first pin and a second end located in the radial opening of the bracket and a second lever pivotally secured at a fulcrum on the first lever by a second pin extending through the first and second levers. A first input force applied to the cylindrical body is transmitted through the spring into the bracket and communicated through the fulcrum point to bring a first end of the second lever into engagement with the control valve and a second end of the second lever into engagement with the power piston. The first input force as applied to the bracket causes the end of the first lever to pivot about the first pin and transmit an actuation force through the fulcrum into the said second pin to move said first end and activate said control valve to meter pressurized fluid into the working chamber to develop a hydraulic force for effecting a brake application. The lever arrangement ratio defined by a first length between the first pin and the second end on the first lever and a second length between the first pin and the second end of the second lever such that axial movement of the cylindrical body and the power piston is defined by this ratio and as a result a hydraulic force produced by the metered pressurized fluid proportional to a manual input force.

A hydraulic brake booster ( ) for use in a brake system ( ) having a first housing ( ) with a first bore ( ) separated from a second bore ( ). The first bore ( ) retains a power piston ( ) and the second bore ( ) retains a control valve arrangement ( ). A push rod ( ) of an input arrangement ( ) is connected to the power piston ( ) and linked to the control valve arrangement ( ) by a lever arrangement ( ). A second housing ( ) encloses the control valve arrangement ( ), lever arrangement ( ) and a projection ( ) that extends from the power piston ( ) to define a cavity or relief chamber ( ) having a permanent low pressure. The input arrangement ( ) supplies the control valve arrangement ( ) with an input force in response to a braking force applied to the push rod ( ) to regulate the communication of pressurized supply fluid from the second bore ( ). The hydraulic brake booster is characterized in that the regulated supply fluid acts on the first piston ( ) to develop a corresponding operational fluid pressure which is communicated to a first set of wheel brakes ( ) while the regulated supply fluid is directly communicated to a second set of wheel brakes ( ) to effect a brake application.

Brake booster

A valve (,) for use in a brake system (,) through which a source (,) of fluid charges an accumulator (,) to a desired fluid pressure level and through which fluid pressure present in a conduit (,) is communicated to a reservoir (,) in the absence of the flow of fluid from the source. The valve (,) has a housing (,) with a bore (,) therein with an entrance port (,) connected to the source of fluid (,), an exit port (,) connected by a flexible conduit (,) to the accumulator (,) and exhaust port (,) connected to the reservoir (,). A sleeve (,) which is located in bore (,) has an internal bore (,) with a first diameter (,) for retaining a first ball (,), a second diameter (,) for retaining a linkage member (,) and a third diameter (,) for retaining a second ball (,). A first spring (,) urges the first ball (,) toward a first seat (,&prime;) formed between the first (,) and second (,) diameters. A second spring (100) urges the sleeve (72) toward a rest position to allow the first spring (,) to seat the first ball (,) on the first seat (,&prime;) to prevent the flow of fluid from the source (,) to the accumulator (,) while allowing free communication between the exit port (,) and the exhaust port (,) to permit fluid pressure in the flexible conduit (,) to be dissipated in the reservoir (,). The communication of fluid from the source (,) to the entrance port (,) developing a force across the sleeve (,) which moves the second ball (,) into engagement with an exhaust port (,) to interrupt communication to the reservoir (,) and allow fluid to flow from the entrance port (,) to the exit port (,) for charging the accumulator (,).

Charging and bleed value

A brake system (10) having a master cylinder (14) connected to wheel brakes (24, 26) of a vehicle through remote compensation valves (20, 22). The master cylinder (14) has a two piece housing (66, 84) with a bore (74, 86) therein. First (32) and second (34) pistons are located in the bore (74, 96) by a sleeve and bearing arrangement (98, 82). Return springs (104, 110) in the bore (74, 96) position the first (32) and second (34) piston to define first (106) and second (114) chambers in the master cylinder (14). The two piece housing has first (22) and second (90) flanges that are joined together by hook (94, 94', 94', 94'') and slots (73, 73', 73', 73'') to form a unitary structure and by bolts (47, 47') which further compress seals (102) by joining the first flange (72) to a brake booster (12) to assure that the bore (114) is sealed from the surrounding environment.

Master cylinder and brake booster arrangement for a brake system

A remote compensation valve (20) through which pressurized fluid from a master cylinder (14) is communicated to the wheel brakes (24, 26) of a vehicle. The compensation valve (20) has a housing (200) with a bore (202) therein for retaining a shuttle piston (210). The shuttle piston (210) has a first land (212) separated from a second land (214) by a groove (216) and an axial bore (218) connected to the groove (216) by a radial bore (224). A first spring (250) carried by the piston (210) urges a poppet valve (244) toward a seat (230) to control the communication of pressurized fluid through the axial bore (218) to an outlet port. A second spring (254) located in the housing (200) urges the piston (210) toward a rest position where the first land (212) engages a pin (234) of a tilt valve (232) to establish communication between the source of fluid and the bore (202) and the poppet valve (244) is seated on the piston (210) to prevent communication through the axial bore (218). A manual input force on a first end (262) of a movable stop pin (250) brings a second end (266) into engagement with the poppet valve (244) to initiate communication between the compensation port (206) and the master cylinder (14) to remove any air from the master cylinder (14).

Remote compensation valves for a master cylinder in a brake system

Structure for caging a return spring of a master cylinder to define limits for an operational chamber. The structure includes a first cylindrical member which engages a first piston and a second cylindrical member which engages a second piston with the return spring being located between the first and second cylindrical members. A stud which has an irregular shaped end member is retained in a groove in the second piston by the second cylindrical member and mated with a head member to define the limits for the return spring between the first and second cylindrical members and correspondingly the maximum size of the chamber within a bore of a master cylinder.

Master cylinder with caging means to secure return spring limiting stud

The master cylinder (30) includes primary and secondary pistons (42, 52) each of which has a center compensation valve member (44, 60). An abutment member or pin (38, 40) extends across a bore (36) of the master cylinder (30) adjacent ends of each of the pistons (42, 52) and the pins (38, 40) are each engaged by shafts (45, 64) of the spring biased valve members (44, 60) of the primary and secondary pistons (42, 52). An output rod (43) of a vacuum booster (41) to which the master cylinder (30) is attached disposes the primary piston (52) slightly spacedapart from the respective pin (40) in an at-rest position. The primary piston (52) includes a self-adjusting compensation center valve seat (70) located within the primary piston (52), the valve seat (70) sealingly and slidingly movable relative to the primary piston (52). The valve seat (70) extends through a rear opening (59) of the piston (52) to engage the respective pin (40). The engagement of the valve seat (70) and shaft (64) of the valve member (60) ensures that the valve head (62) is always positioned a predetermined distance (C) from the valve seat (70) in the at-rest position of the primary piston (52). The brake pedal 'feel' can be closely controlled to minimize soft pedal feel during brake actuation by minimizing stackup tolerances within the master cylinder (30) such that the valve member (60) of the primary piston (52) closes very quickly.

Center valve master cylinder with self-adjusting compensation center

A center-compensation master cylinder (10) has first (20) and second (30) pistons with center-compensation valve members (27, 37). The pistons (20, 30) have diametrically extending slots (22, 32) at central axial portions thereof through which extend pin members (53, 54) to effect opening of the valve members (27, 37) when the pistons (20, 30) are in at-rest positions. A first spring (29) extends between a head (24) of the first piston (20) and the second piston (30), and a second spring (39) extends between an end (15) of the bore 0 (I4) and the head (34) of the second piston (30). The first spring (29) is caged via a caging mechanism (60) ensuring that the first (20) and second (30) pistons will travel simultaneously when the center-compensation valve members (27,37) are closing. The caging mechanism (60) is adjustable to control accurately the location of the second piston (30 ) in an at-rest position. The caging mechanism comprises an end part (47) non-rotatably and axially coupled with longitudinal extensions (40) of the head (24) of the first piston (20), a member (65) adjustably coupled with a threaded end (47C) of the end part (47), and a head (66) of the member (65) abutting a cage end member (70) which seats at a back portion (31) of the second piston (30). The cage end member (70) is cup-shaped and includes a radially flared lip (74) providing a seat for one end of the first spring (29) while the other end of the first spring (29) is received at a diametral extension (28) of the first piston (20).

Center valve master cylinder with adjustable caged primary spring

A caging arrangement for limiting the extension of springs in a bore. The caging arrangement includes cylindrical members which are connected to pistons in a master cylinder. The cylindrical members which are joined to the pistons and communicates the force of piston return springs to urge the pistons toward a rest positions while a valve return springs retained by the cylindrical members urges valves toward stops to control fluid communication between a reservoir and pressure chambers associated with the pistons.

Spring caging for a master cylinder

A reaction mechanism (462) that is carried on a disc (80) of a wall (70) to provide a control mechanism (81) with an indication of the output force being supplied to a push rod (132) through the combined outputs of wall (70) and wall (18) which move in opposite directions.

Reaction mechanism for tandem brake booster

A tandem brake booster having first and second lever arms for transferring an output force from a second wall into an output member in response to an input signal being applied to a control member. A first cam surface on each lever arm engages an annular fulcrum member and a second cam surface engages the output member. The engagement of first and second cam surfaces on the fulcrum and output member direct said output force from said second wall into said control member along a force vector substantially parallel to the output member without the introduction of rotational forces on a first wall.

Tandem brake booster

A coupling device (30) for connecting the armature (16) of an electric motor (10) to a piston (26) of a pump assembly (20) comprises an input member (32) which rotates and imparts the rotation to an output member (34), with a resilient member (36) disposed between the input member (32) and output member (36) to prevent the transmission of noise-generating vibrations between the electric motor (10) and pump assembly (20). The input and output members (32, 34) have respective axially extending projections (44, 46) circumferentially spaced-apart from each other and fingers (52) of the resilient member (36) extend radially into spacings between the projections (44, 46) in order to transmit rotation of the input member (32) to the output member (34) without permitting transmission of noisegenerating vibrations therebetween.

Noise reduction coupling device for an electric motor pump

A fluid actuator housing (40) supports an output member 56 and a valve assembly (62). The valve assembly controls fluid communication to a pair of chambers (58, 60) to reciprocate the output member within the housing. The first part (64) of the valve assembly directs fluid communication to the chambers and the second part (66) is engageable with the output member to control movement of the first part.

Fluid actuator

An integrated control mechanism for regulating the communication of pressurized fluid from a source to a brake system and a steering system of a vehicle in response to independent operator brake and steering signals. The integrated control mechanism has a housing with a bore therein connected to a single source of fluid under pressure. A rotary valve located in the bore is rotated in response to an operator steering signal to control the communication of the pressurized fluid to the steering system from the bore and thereby provide a power assist in steering the vehicle. A spool valve, concentrically located in said bore with respect to said rotary valve, linearly moves in response to an operator braking signal to control the communication of the pressurized fluid from the bore to the brake system and thereby provide a power assist in effecting a brake application.

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Granger, IN, United States of America

Robert K Wilson