Abstract: The dual braking unit includes a cylinder with a diaphragm 4, 11-17) for controlling the service braking and a cylinder with a drive spring (3, 6-10) for controlling the parking and emergency braking. The cylinder with the spring includes a piston (6, 10) with an operating tube or tubular push rod (10) which extends sealingly through a hole (5) in a wall (2) separating the operating chambers (8; 12) of the cylinders. There is a pair of holes (35, 36; 35, 34) in the tube (10) for enabling communication between the chamber (7) with the spring (9) and the operating chamber (12) of the cylinder with the diaphragm when only the parking and emergency brake is applied. A cut-off valve device (40-43) is associated with the holes (35, 36; 34. 35) for preventing air from flowing from the operating chamber (12) of the cylinder with the diaphragm to the chamber (7) with the spring (9) when the service brakes are applied while the parking and emergency brake is applied.

Abstract: The invention relates to a vacuum brake-booster of the tandem type comprising two compartments (22, 24) separated by a stationary plate (20), each of the compartments being divided into a front chamber and a rear chamber by way of a piston (26, 28) and of an isolating diaphragm, at least the inner edge of which is equipped with a bead (38), each of the pistons (26, 28) being fixed to a movable hub (42) containing a valve mechanism, the piston (26) of the front compartment being so fixed by way of a cylindrical sleeve (30). According to the invention, the hub (42) possesses, on its periphery, a groove (32) into which penetrate respectively the inner end (34) of the piston (28) of the rear compartment (24) and the rear end (26) of the cylindrical sleeve (30), the bead (38) of the inner edge of the diaphragm (40) of the rear compartment (24) ensuring the locking of the assembly as a whole.

Abstract: A clutch drive mechanism for the cooling fan of an automotive engine includes a driving member rotated by the vehicle engine and a driven member carrying fan blades. The driving member includes an axially movable portion which is rotated through drive pins slidably received in bores in the axially movable portion. Resilient grommets are carried in the walls of the bores and engage the pin to prevent noise and rattling as the clutch members are engaged and disengaged. Grooves are provided on the pins which receive the grommets when the axially movable portion is in the fully disengaged position, which allows the axially movable portion to move to a truly centered position with respect to the spindle, thereby eliminating stress on the components when the mechanism is in the released condition.

Abstract: A load-controlled brake compensator for a vehicle possessing a chassis and at least one axle, includes a fixed part (10) solidly attached to the chassis and comprising at least one compensating valve provided with a pivotingly mounted control lever (12) of which one end is associated with the axle via a preloaded spring device (18) whose length is preset by way of a temporary strut (22) before one of its ends (20) is fixed to the axle, the other end of the spring device being solidly attached to a rod (16) capable of sliding in an opening (14) made in the end of the lever (12). It further comprises an elastic mechanism (24) tending to restore the spring device (18) towards the lever and a locking means (28, 29, 30) allowing the sliding movement of the rod (16) in the opening (14) to be prevented after fixing of the spring device (18) to the axle and before removal of the temporary strut (22).

Abstract: The control circuit of a double-acting hydraulic jack (10), consisting of a piston (12) connected to an output rod (18) and separating a cylinder into two chambers (14, 16), comprises a source of fluid under pressure (20, 26), a distribution system (28, 28', 52, 52') alternately putting one of the chambers, or control chamber, in communication with the source of fluid under pressure (20, 26) and the other chamber, or controlled chamber, in communication with a reservoir of fluid under low pressure (25), in order to control the movement of the piston (12) of the jack (10). The jack comprises an auxiliary circuit (50, 120, 122) for preventing communication between the controlled chamber and the reservoir (25), interrupting communication between the control chamber and the source of fluid under pressure (20, 26) and allowing communication between the controlled and control chambers when the pressure of the fluid in the controlled chamber exceeds a predetermined value.

Abstract: An air dryer control system is disclosed in which the compressed air output of a compressor is dried by one of two air dryers connected in parallel. The purging and drying cycles of the air dryers are alternated by timing and relay device. Upon start-up, the output of the compressor is dried by both air dryers until the pressure level in the supply reservoir attains a predetermined level. When the governor cutout pressure is achieved in the reservoir, both air dryers are purged.

Abstract: The pump (10) with integral sump (100) comprises a pump body (12) having therein a bore (18) in which is disposed a resiliently biased and reciprocating pump piston (30). One end of the pump piston (30) is received within an end opening (22) of the bore (18) and a central opening (42) of an outlet member (40). The outlet member (40) includes outlet valve openings (45) each housing a coil spring (41) or elastomeric member (41A) biasing a valve member (43) against a valve seat (49). The valve openings (45) communicate with an interior opening or pumping chamber (44) of the outlet member (40) wherein a spring member (46) biases an inlet valve (60) against an inlet seat plate (70). The inlet seat plate (70) has a central opening (72) communicating on one side with a sump chamber (110). A sump sleeve (90) is located sealingly within the bore (18) and abuts the inlet seat plate (70), contains therein a slidable sump piston (98) biased by a sump spring (96), and has a plurality of inlet openings (92).

Abstract: A turbocharger includes a turbine housing with a variable geometry mechanism which controls the flow area of the throat through which motive exhaust gasses are communicated to the turbine wheel. The turbine housing is provided with an insert which defines one wall of the throat and which is cast in place as part of the turbine housing. The insert may be made of a relative expensive, high nickel content material to assure that a non-corrosive surface is provided adjacent to the vanes which are pivotally actuated to vary the area of the throat. The remainder of the housing is made of a standard ductile iron which is substantially less expensive than the more expensive corrosive resistant high nickel content material from which the insert is manufactured.

Abstract: 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.

Abstract: The master cylinder (10) with externally adjusted secondary compensation comprises a tandem master cylinder (10) having primary and secondary piston assemblies (20, 30) disposed within a stepped bore (12). The portion of the bore containing the secondary piston assembly (30) has an enlarged diameter bore section (14) such that an end member (50) may be threadedly received within a bore opening (13) of the master cylinder (10). The end member (50) includes a longitudinal portion (55) having therein at least one outlet opening (60) and one compensation opening (58), each opening (58, 60) communicating with an interior opening (56) receiving slidably the secondary piston assembly (30) and a resilient spring (34) seated at one end of the interior opening (56) and biasing the secondary piston assembly (30).

Abstract: A spring and lever arrangement for imparting a spring force to a plunger of a control valve in a brake booster by operating a solenoid member during a brake application. Movement of the plunger by an operator input force allows a pressure differential to develop across a moveable wall and produce an original output force which is supplied to a pressurizing member. Resistance to movement of the pressurizing member creates a reaction force. The reaction force balances the spring force and operator input force to terminate the development of the pressure differential while correspondingly modifying the output force supplied to the pressurizing member. A switch allows an operator terminate the operation of the solenoid to effectively obviate the spring force and allow the original output force to be produced by the operator input force.

Abstract: A method and apparatus for providing charge air to the intake manifold of an internal combustion engine at high pressure levels at low engine speeds without compressor surge provides an auxiliary turbocharger which receives a portion of the compressed air produced by a main turbocharger at low exhaust gas flow conditions. The remainder of the compressed air generated by the turbocharger under such low exhaust gas flow conditions is communicated through the compressor section of the auxiliary turbocharger, where the pressure of the compressed air is further increased to a level sufficient to provide charge air at an adequate pressure level to the intake manifold of an internal combustion engine to permit efficient operation of the engine with minimal emissions at low engine speeds.

Abstract: A diaphragm for a brake booster having an annular inner bead with first and second radial surfaces separated by an apex. The second radial surface has a plurality of indentations that extend from the apex. In response to a positive pressure differential created by vacuum in a first chamber and air in a second chamber, an output force is developed to effect a brake application corresponding to an input force. This positive pressure differential act on the annular bead to urge said first radial face into engagement with a wall to prevent communication between the first and second chambers during a brake application. In the absence of the presence of vacuum in the first chamber, the input force acts on the wall to develop an operational pressure in the first chamber to develop a negative pressure differential between the first and second chambers.

Abstract: A pressure reduction mechanism (10) is installed in a brake circuit of the rear axle of a motor vehicle, comprising a master cylinder (1) and at least one monitoring device, the mechanism executing the brake-pressure reduction only in specific circumstances and comprising a regulating piston (14) sliding sealingly in a bore (13) and stressed by at least one spring (16, 17) in the opening direction of a regulating valve (15). The spring (16, 17) is arranged in a sealed chamber filled with an incompressible fluid, and a solenoid valve (22) controls the opening or closing of communication between the chamber and a reservoir of the fluid under low pressure.

Abstract: A device for and method of providing reliable audible and visual warnings of incipient preignition in a combustion chamber is disclosed. The current flow through at least one engine spark plug is monitored at specified times throughout a number of engine revolutions during which there should be no current flow and both an audible alarm and a visible alarm are activated in the event the monitored current flow exceeds a predetermined threshold. Circuitry establishes time intervals during which there should be no current flow through the monitored spark plug and additional circuitry temporarily provides both an audible alarm and a visible alarm for each occurrence of the monitored current exceeding the predetermined threshold. Such a temporary alarm typically has the same duration as the detected excess current. There is also circuitry for continuously enabling both the audible and visible alarms in the event of an excessive number of excessive monitored current flows within a specified length of time.

Abstract: The circuit controlls a fluidically controlled brake regulator (7) in dependence on the load of a vehicle having at least two wheels each provided with a suspension member (1, 2). Each suspension member (1, 2) cooperates with a fluidic pressure sensor (11, 12) to control the regulator (7) in dependence on the load carried by only one of the wheels, namely the wheel carrying the lighter load.

Abstract: The shoe hold down spring (40) comprises a single wave form or serpentine shaped leaf spring (40) which is engaged at opposite ends (42, 44) by hold down pins (53, 55) of a drum brake. The hold down pins (53, 55) are connected with the backing plate (12) and extend through respective openings (21, 23) within a brake shoe web (20). The hold down spring (40) includes opposite ends (42, 44) and a middle portion (41) all of which extend away and are spaced-apart from the shoe web (20), and two intermediate curved portions (47, 49) which engage the web (20). The opposite ends (42, 44) of the hold down spring (40) have slots (43, 45) extending inwardly from spring edges (42A, 44A), and small curved recesses (42B, 44B) which effect securement of ends (53A, 55A) of the pins (53, 55) to the spring (40). The pins (53, 55) have laterally extending wings (53B, 55B) at the pin ends (53A, 55A) which are received within the small curved recesses (42A, 44A) at the respective ends (42, 44) of the spring (40).

Abstract: The disc brake with variable width caliper and powered actuation comprises first and second bridge members (14, 15) connected to two movable members (20, 30) extending over the periphery of the rotor (51). An inboard end of each movable member includes threads having threadably mounted thereon a nut (28, 29). The nut has ratchet teeth on one axial end which engage ratchet teeth (10A, 11A) of an associated actuator sleeve (10, 11) disposed slidably about the movable member. Each sleeve includes gear teeth (10C, 11C) about its circumference. The second bridge member is mounted slidably upon the movable members. The teeth of the sleeves are engaged by a rack member (110). A piston (117) includes an arm (125) connecting the piston with a rack (130) of the rack member so that hydraulic pressure effect displacement of the piston and a lateral displacement of the rack.

Abstract: The invention relates to a brake subassembly for a vehicle having an engine compartment and a passenger cell separated by a bulkhead (46), the subassembly comprising: a pneumatic boost servomotor controlled by way of a pedal (28) and intended to be fixed to the bulkhead (46), the servomotor comprising, coaxially, a front shell (14), having a cylindrical wall, and a rear cover (16) and having, on the inside, two chambers (18, 20) separated in leaktight fashion by a piston (22) provided with a diaphragm (26) ensuring leaktightness between the two chambers, a master cylinder (10) fixed to the front shell (14) and at least one brake pedal (28).

Abstract: A bearing piece for a suspension unit of a motor vehicle, acting as a pressure sensor for a fluid-controlled brake regulator and intended to be mounted between a suspension element (12, 14) and a part of the vehicle by way of an elastic bearing (16) or, a pivoting mounting, has a piston mechanism (20) which can move counter to the pressure prevailing in a leaktight chamber (24). A mechanism (30, 34, 36, 40, 42) is provided so that the pressure in the leaktight chamber (24) is greater than a predetermined pressure.