Abstract: A hydraulic antilock brake system is described, with a multi-way valve hydraulically switched to connect the brake pressure generator (1) to the wheel brake (2), controlling, in response to the pump pressure prevailing in the auxiliary pressure conduit (4), the pressure fluid connection between the brake pressure generator (1) and the wheel brake (2). The valve (3) is switched by pump pressure in the absence of pressure from the brake pressure generator, but held or switched open if the brake pressure generator is operated. This allows a low-cost adaption to traction slip control with no need for additional electronic controls while substantially preserving the basic circuit configuration, especially the electronic control system.

Abstract: A liquid-sealed type vibration isolator has a resilient member disposed between the a mounting member, connected to one of a vibration-generating portion and a vibration-receiving portion, and a second mounting member, connected to the other one of the vibrator-generating portion and the vibrator-receiving portion, and the resilient member is adapted to undergo deformation during occurrence of vibrations. A pressure-receiving liquid chamber is disposed in such a manner as to be capable of expanding and shrinking by using the resilient member as a portion of a partition wall thereof. A limiting passageway allows the pressure-receiving liquid chamber and the auxiliary liquid chamber to communicate with each other.

Abstract: An elastomeric bearing, such as a hydraulically damping bearing for motor vehicles can have at least two fastening parts which are connected to one another by means of an elastomer spring. Such a bearing can also have a vertically acting hydraulic damping apparatus and at least one hydraulic damping apparatus acting in the horizontal direction, which damping apparatus essentially are chambers filled with damping fluid and connected to one another by damping passages. The chambers of the horizontally acting damping apparatus can be molded into the elastomer spring and disposed opposite to one another in the direction of damping, with at least one passage connecting the chambers. The chambers of the horizontally acting damping apparatus can be bordered by a separating part, and underneath the separating part there can be a second damping apparatus oriented in the direction of the Cz vertical coordinate axis.

Abstract: A control valve having, in a series with a first inlet valve of a quick brake volume, two different rates of flow restrictions operable as a function of the position of the piston. The first flow rate of one first restriction is insufficient to cause the piston to a braking position for applying a minimum service application for first range of piston positions which would generally be produced by the mechanical vibration. The second restriction has a greater flow and will accelerate the piston to a braking position for a second range of piston positions which will be produced by the reduction of the brake pipe pressure on one face of the piston. By providing two flow rates, the valve becomes insensitive to mechanically produced forces while maintaining the reaction time of the valve to fluidically produced reduction of brake pipe pressure.

Abstract: An electrically controlled fluid displacement piston positioned in a bore modulates braking pressure at a wheel brake for antilock controlled braking by modulating the position of the piston in the bore. At a fully extended home position, a check valve is unseated by the piston to hydraulically couple the brake system master cylinder to the wheel brake. To minimize the occurrences of the condition where the check valve is opened during ABS controlled braking, the piston is initialized prior to entry into antilock controlled braking at a position away from the check valve resulting in a greater volume of fluid being trapped upon entry into antilock controlled braking when a hydraulic passage in parallel with the check valve is closed in response to a detected incipient wheel lock condition. This permits the antilock brake system to apply a controlled brake pressure greater than the pressure initially trapped in the closed system.

Abstract: In an hydraulic braking system for vehicles solenoid-controlled valves are located in brake lines between the master cylinder and brakes on front and rear wheels of the vehicle. The solenoid-controlled valves are adapted to operate independently of each other to achieve independent pressure levels in the front and rear brakes by operation of a motor driven pump in response to signals supplied to an electronic control module from pressure sensing apparatus in each respective brake line.

Abstract: A dual-circuit braking system for motor vehicles with an anti-locking device and optionally traction control, which is equipped with at least one pressure reducer for the brake pressure in the front-axle brake cylinders. With normal braking this pressure reducer is activated and the brake pressure on the front wheels is reduced. In the case of anti-locking, the pressure reducer is deactivated. However, with a defect in the electrical system or the anti-locking device, the pressure reducer is de-activated, and braking occurs at the front and rear such that vehicle deceleration of 0.82 G blocks the front wheels before the rear wheels.

Abstract: The electrohydraulic or electropneumatic braking-control device for axles of trailers having mechanical brakes includes a hydraulic or pneumatic circuit mounted on the trailer, made up principally of a pressure accumulator, the internal pressure of which is automatically adjusted above a minimum value, as well as of a control gate, the opening of which is proportional to a control current function of the pressure exerted on the brake pedal of the tractor vehicle and of an adjustment carried out as a function of the load of the trailer. In case of attachment parting or of unhitching of the trailer, the disconnection of the connection plug actuates a safety valve that automatically controls the energetic braking of the trailer. The safety valve includes a manual control. It is possible to unbrake, then to rebrake the trailer in order to maneuver it. The trailer braking device may be mounted from the outset or subsequently, requiring only few transformations of the tractor vehicle.

Abstract: An operating mechanism (17) for a sliding caliper disc brake including a caliper housing (1) a thrust element (9) slidably mounted in the housing for reciprocating movement toward and away from a disc brake (2), two thrust spindles (10, 11) in screw threaded engagement in the thrust element (9) each having on their ends caliper feet (12, 13) engaging against a brakehead on which brake linings (3) are mounted, a brake shaft (8) rotatably mounted in the housing (1) so that rotation of the brake shaft about an axis of rotation (B) in an actuating direction moves the thrust element (9) toward the brake disc and rotation in the opposite direction retracts the thrust element, a force-dependent freewheeling clutch drive (18) coupled on one side to the brake shaft (8) and on the other side to the thrust spindles (10, 11), a recess (16) in the brake shaft (8), and an operating mechanism (17) for coupling the clutch drive (18) to the thrust spindles (10, 11) having an operating shaft (25) extending through the recess (

Abstract: A trailer stability brake control method is disclosed for an articulated vehicle 11 which involves determining values indicative of tractor turning radius of curvature (TRC), articulation angle (AA) and time derivatives thereof, a value for wheel speed variance (WSV) is determined, and then a stability indicator (SI) is determined for each of TRC and AA, and the time derivatives thereof. The later step is performed by signal processing means (63) including filter means having a cutoff frequency (.OMEGA..sub.c) with the cutoff frequency decreasing as the wheel speed variance increases, and vice versa. The trailer brake control means (125) is de-actuated whenever the stability indicator (SI) relating to the articulation angle (AA) becomes less than the wheel speed variance.

Abstract: A dual circuit brake valve system comprises first and second brake circuits, first and second combined inlet and outlet valves through which first and second braking pressures respectively are delivered to said first and second brake circuits, and first and second pistons which actuate the first and second combined inlet and outlet valves respectively. The second piston is actuated by the first braking pressure which serves as a control pressure therefor. To achieve simultaneous actuation of the first and second combined inlet and outlet valves, a compression spring is installed between the first and second pistons and mechanically connects these to each other. Thereby, a pressure difference of .DELTA.p between the pressure in the first brake circuit and the pressure in the second brake circuit, which approaches zero, is achieved. In order to be able to increase the pressure difference .DELTA.p in the two brake circuits, a third piston is provided between the first and second pistons.

Abstract: This invention relates to a cable actuated parking brake mechanism for a drum brake. A lever and an associated lever return spring are arranged to accommodate blind assembly of the cable to the lever. The spring guides the cable from an opening in the backing plate to the lever. The spring cooperates with the lever to indicate to an assembler that the cable is fully inserted as well as aids in directing a cable button to an engagement surface.

Abstract: A brake release lock interposable between the master cylinder of a hydraulic vehicle braking system and the wheel cylinders, including a first connecting element for connection to the master cylinder, a second connecting element for connection to the wheel cylinders, a first passageway connecting the first and second member, having a valve seat and bore for a check valve spring-biased against the seat and configured in such a way as to permit fluid to flow from the master cylinder to the wheel cylinders, but to prevent fluid from returning from the wheel cylinders to the master cylinder, a second passageway connecting the first and second connecting elements, bypassing the first passageway, and a solenoid valve responsive to signals producible by an authorized user of the vehicle, for cutting off the second passageway after the vehicle has been parked, and for re-establishing the second passageway prior to driving off the vehicle.

Abstract: A valve assembly for controlling the delivery and exhaustion of pressurized air to and from an air spring. The valve assembly comprises a body having a valve bore with a coaxially open end, and a port in communication with the valve bore. The port is adapted to receive an air connection with an air spring. An actuator shaft, having a first end and a second end, is disposed coaxially in the valve bore for reciprocal movement between an actuating position and a rest position, and is biased toward the rest position. A valve block fixes within the valve bore and has an internal end and an external end. A coaxial bore extends from the internal end to the external end and slidably receives the actuator shaft second end. A stop chamber is disposed between the external end and the internal end. The valve block has a seat on the external end at the coaxial bore. An air passage communicates with the port and the coaxial bore.

Abstract: A bushing for an automotive torque strut is described as having a resilient, elastomeric insert which is bonded to a rigid, inner sleeve, and provided with a plurality of resilient, elastomeric fingers which are flexible and not bonded to an outer sleeve or housing of the bushing. The fingers are specially located in the insert. In one embodiment, there are aligned pairs of oppositely disposed fingers which extend into large pie-shaped voids which are spaced on opposite sides of the inner sleeve. In the other embodiment, the insert is provided with radially oriented grooves and fingers which are alternately disposed around the inner sleeve.

Abstract: An ultrasonic wave is propagated through a brake pad to determine various brake conditions including brake pad wear, brake status (engaged/disengaged), a wet brake failure or a brake drag failure. The propagation and reflection time of an echo signal generated at a far boundary of the pad is indicative of brake wear. Brake drum or disc speed is determined by using radial indicia on the periphery of the drum or disc to modulate an ultrasonic wave reflected from or transmitted through the drum or disc and demodulating the sensed modulated signal as a speed indication. The various other conditions are determined by means of filters, comparators and logic.

Abstract: Energization of a fluid-pressure operated booster is controlled solely by operation of a solenoid-operated valve device, suitably first and second solenoid-operated valves, responsive to signals from an electronic controller. The construction of the booster is therefore modified in comparison with known boosters by the omission of the conventional mechanical valve adapted to be operated by the pedal for normal operation of the booster.

Abstract: A brake system for off-road vehicles of the type including an operator seat, a brake pedal and a hydraulic brake responsive to operator actuation on the brake pedal. The brake system includes a tank for hydraulic fluid, an electric pump hydraulically connected to the tank, a pressure modulating valve actuated by the brake pedal and a flow control valve for controlling the flow of pressurized hydraulic fluid between the pump, pressure modulating valve and brake. During normal braking operation, a switch responsive to operator actuation of the brake pedal causes to provide pressurized hydraulic fluid to the brake through the flow control valve. The return flow of pressurized fluid to the tank is modulated by the pressure modulating valve in response to operator actuation of the brake pedal to control the braking pressure. The flow control valve is responsive to the presence of an operator in the operator compartment, and is coupled to a switch.

Abstract: Engine speed is measured at successive moments and the gradient DN.sub.mot of the engine speed is determined based on successively measured engine speeds. Speeds of the driven wheels are measured and used to generate wheel speed signals, which in turn are used to control slippage of the driven wheels. The wheel speed signals are subject to a rise limitation dependent on the gradient DN.sub.mot of the engine speed. In a preferred embodiment the rise limitation is active when the vehicle is in first gear, the gradient DN.sub.mot is positive, VABS (n) is greater than or equal to VASR(n-1) , and VABS(n) is greater than or equal to VASR(n-1)+DN.sub.mot /K, where VABS(n) is a wheel speed signal generated by the ABS at moment n and VASR(n-1) is the wheel speed signal generated by the ASR in the previous moment.

Abstract: Described is an ABS for vehicles in which all wheels are driven. Of particular concern is the forming of a final reference speed for the slip control. From the speeds of wheels with different speeds, an auxiliary reference speed, and a reference speed and a final reference speed for the slip control is formed . In the event of instability, however, the increase of the auxiliary reference speed determines the reference speed.