Abstract: A braking device for use in a motor vehicle has a vacuum motor having a casing, a power piston displaceably mounted in the casing through a diaphragm which partitions the interior of the casing into a constant pressure chamber and a variable pressure chamber and which is adapted to be displaced by the pressure difference between the two chambers. A input rod of the braking device is connected to the brake pedal. A valve mechanism is disposed in the power piston and controls the pressure in the variable pressure chamber in response to force applied to the input rod. A control valve is connected to the vacuum motor and adapted to be electrically controlled by a controller to selectively supply driving pressure to the vacuum motor.

Abstract: A vehicle braking system having a servo booster connected to a brake pedal of a vehicle, a hydraulic braking system having a master cylinder which is connected to the servo booster, a booster control device for generating an output force on the servo booster independently of the actuation of the brake pedal, at least one detector for detecting at least one parameter which changes in response to the operating conditions of the vehicle, and a control circuit connected to the detector and controlling the booster control device.

Abstract: A feed circuit for feeding a railway train braking system and usable in conjunction with a compressed air system or with a vacuum system, the feed circuit including an air compressor (1) and being characterized in that it further includes a static vacuum pump (14) powered by the compressed air delivered by the compressor.

Abstract: This brake system contains a braking pressure generator aggregate which influences the rear axle braking pressure so as to control the braking force distribution between front and rear axles in dependence on the static and dynamic axle load distribution and on other parameters resulting from the braking behavior. The braking pressure generator aggregate is connected to a tandem master brake cylinder and pressurized by an operating pressure, the braking pressure generator aggregate reduces in a ratio corresponding to a basic rating of the braking force distribution and makes available for basic rear axle braking pressure. The tandem master brake cylinder thus performs the major part of the braking operation at the rear axle. A vacuum servo drive is a part of the braking pressure generator aggregate and is activated in order to raise or lower the braking pressure at the rear axle above or below the basic braking pressure.

Abstract: A brake system for automotive vehicles is disclosed comprising a vacuum brake force booster operatively located between a brake pedal and a master brake cylinder. The vacuum brake force booster includes at least two working chambers separated from one another by a membrane plate, one of the working chambers, through a master magnetic valve, being in communication with a vacuum source and the other working chamber being vented through a control valve acutable by the brake pedal to generate a brake force proportional to the brake pedal force. Connected to the master brake cylinder are brake circuits applying pressure to the wheel brake cylinders. Sensors associated with the wheels detect the rotational behavior of the wheels to identify a locking condition.

Abstract: An automotive vehicle braking device comprises a hydraulic master cylinder (11) having at least one piston (21) for pressurization of the wheel cylinders connected thereto with hydraulic pressure and also having a vacuum brake force booster (12) inserted between the brake pedal (52) and the piston (21). The master cylinder (11) is integrated in the construction of the vacuum brake force booster (12).

Abstract: A brake power-controlled brake device for automotive vehicles is provided with a hydraulic master cylinder (11) which is, via a pneumatically actuated pressure modulator (12), connected to at least one wheel cylinder brake circuit I. The pressure modulator (12) comprises a vacuum power generator (20) and a compensating cylinder (18) equipped with a hydraulic piston (16, 16' or 16"), connected to which compensating cylinder is the wheel cylinder brake circuit I. If a brake slip signal occurs, the piston wall (14) of the vacuum power generator (20), which piston wall is normally applied by a vacuum on both sides, is temporarily connected with a higher pressure in the direction in which the volume in the compensating chamber (32) is increased. In addition, an isolating valve (15) is provided which is normally open but is closed when a brake slip signal occurs, and which is inserted in the connecting line (19) from the master cylinder (11) to the compensating chamber (32).

Abstract: A vehicle braking system equipped with an adaptive braking system with traction control to control drive wheel slip during vehicle acceleration includes a conventional vacuum brake booster having a vacuum chamber normally connected to engine manifold vacuum and an atmospheric chamber connected to the vacuum chamber when the brakes are released but which is connected to atmosphere when a brake application is effected. The traction control system includes a control unit which actuates a solenoid valve under wheel slip conditions during vehicle acceleration to cut off communication between the vacuum chamber and engine manifold vacuum. The traction control system also cuts off communication between the vacuum chamber and the atmospheric chamber and initiates communication of the atmospheric chamber directly to engine manifold vacuum, thereby effecting a brake application proportional to engine manifold vacuum, which varies as a function of engine power.

Abstract: To protect brake fluid against evaporation under extreme braking conditions, the brake fluid contained in the wheel brake cylinders is kept at a minimum pressure between 5 and 10 bar even after completion of a braking operation, thereby increasing the boiling point of the brake fluid. The wheel brake cylinders are designed as stepped cylinders with a counterpressure space, into which a likewise constantly kept counterpressure can be introduced, which maintains equilibrium with the admission pressure prevailing in the inlet pressure space of the respective wheel brake cylinder. A non-return valve arrangement, connected between the brake booster and the inlet pressure spaces of the wheel brake cylinders, blocks the return of the brake fluid to the brake booster when the pressure differential between the wheel brake cylinders and the brake booster drops below a threshold value P.sub.S.

Abstract: A brake system for automotive vehicles is equipped with devices for the electric control of the brake force distribution and/or for the control of slip. The front wheels are connected to a pedal-actuated braking-pressure generator (1). In contrast thereto, the rear wheels (HR, HL) are acted upon with braking pressure by virtue of a braking pressure generator unit (5) which is composed of a vacuum servo unit (6) and a master cylinder (7) and which is actuated by a multidirectional control valve (4), such as a three-way/three-position rotary spool valve. The switch position of the valve (4) is responsive to the electric output signals of an electronic combining circuit (17, 17') which is, by way of wheel sensors, furnished with information about the rotational behavior of the wheels and the output of which circuit is electrically connected to the drive (19) of the three-way/three-position rotary spool valve (4).

Abstract: A hydraulic brake system comprises a pedal-actuated tandem generator cylinder (3), an auxiliary-pressure supply system with electromotively driven pump (8) and pressure fluid supply reservoir (31) and an auxiliary-pressure control valve (7, 67). The tandem generator cylinder (3) is provided with a bore (24) extending wherethrough is an actuating rod (25, 72) which acts upon a primary piston (4, 68) and whose end remote from the primary piston (4, 68) cooperates with an initial-pressure piston (16) or a vacuum brake power booster (84) slidably supported in the bore (24) and being in turn coupled with the brake pedal (19) by way of a piston rod (17, 86). An annular piston (26) is displaceably arranged in the bore (24) between the primary piston (4, 68) and the initial-pressure piston (16) or, respectively, the force-output member (74) of the booster (84).

Abstract: An air assisted sliding device has a pallet supported on a base. The pallet has a recess provided on the periphery of its bottom surface in which a flexible tubular sealing member is mounted. The sealing member has a memory normally contracting it so as to be flat. An air passage communicates with the interior of the flexible sealing member so that compressed air can be fed to it. A groove is evenly provided on the bottom surface of the pallet within the bounds of the recess and a separate air passage for feeding compressed air or vacuum air is communicated with the groove so that the pallet may be provided with an air film of compressed air or may be stopped and a vacuum applied to attract the pallet to the base at a predetermined position on the base. A timing belt drive or an electromagnetic motor is used.

Abstract: A brake system includes a brake booster coupled to a front wheel brake cylinder. The brake booster substantially defines a pair of rear wheel brake cylinders separate from the front wheel brake cylinder so that a pair of diaphragms are separated during braking to generate a power assist for the front and rear brake cylinders. A control valve cooperates with the brake booster to alter the power assist for the rear brake cylinders in response to a signal from an electronic control unit.

Abstract: A supplemental brake system operates in cooperation with a motor vehicle's extant emergency brake system for selectively slowing a spinning wheel. A selector valve communicates with the vehicle's vacuum system and conduits are sized to cause a delay in the slowing of the spinning wheel. Further, the system provides for the gradual extension of the emergency brake cables which is unaffected by changes in vacuum levels in the vacuum system. The operator has full control of the vehicle during the system's operation.

Abstract: An improved coupling disk and friction ring arrangement provides for long life, high speed operation of clutches and/or brake devices operated by fluid pressure as in vacuum operated clutch and/or brake devices. The improved coupling disk has stepped ring-shaped portions tapering to a minimal outer annular disk portion having greatest flexibility in the overall flexible disk. The outer portion contacts a friction ring to seal a gap therebetween and provide coupling between an axle on which the disk is mounted and a housing to give either clutch or brake output. The friction ring acts in coupling with the disk while an encircling peripheral annular portion of the disk provides a leakage gap of constant predetermined value unaffected by wear in the disk or friction material. Preferably the gap is formed by burnishing the friction material using the eccentricity of the disk to define a minimum gap. The gap has a size such as to provide a block to leakage air flow.

Abstract: The air intake of an internal-combustion engine passes through a throttle whose upstream and downstream sides are shunted by an idle-speed circuit. A vacuum-actuated auxiliary device has a vacuum line connected to the downstream side of the throttle. An injector-type jet pump connected in the idle circuit has an outlet connected to the downstream side of the throttle, a high-pressure inlet connected to the upstream side of the throttle, and a low-pressure input connected to the vacuum line. This jet pump serves as a vacuum amplifier during low-speed engine operation to ensure sufficient vacuum to drive the auxiliary load.

Abstract: This specification deals with the stopping, positioning, orienting and redirecting a semiconductor wafer being transported along a track on an air film or bed of air. The stopping mechanism is an air jet located in a groove in the track, wafers passing over this air jet on an air film are sensed by a pneumatic sensor that turns on the air jet to set up an air stream under the transporting surface of the air film. This air stream sucks the fluid in the air film along with it in the groove causing a vacuum in the bed in the area of the nozzle of the air jet. The wafers are then stopped by the suction of the vacuum. Positioning, orienting and redirecting is done using the air jet and pneumatic sensor in combination with special air jet arrangements and operations.