Showing papers on "Brake pad published in 1973"

Fluid operated clutch and brake

Abstract: A press drive mechanism is disclosed having brake and clutch disc assemblies concentric with respect to the output shaft of the mechanism, and a concentric fluid operated piston-cylinder assembly for alternately actuating the brake and clutch mechanisms. Air actuated and hydraulic fluid actuated piston and cylinder arrangements are disclosed, and an arrangement is disclosed for incremental rotation of the output shaft when the brake mechanism is actuated.

Self releasing brake device

Abstract: For a moving element such as a disc. Two brake sub-assemblies are mounted on each side of the element on a support which is slidable in a direction perpendicular to the rubbing surfaces of the moving element. Each sub-assembly comprises a brake pad having a friction surface parallel to the corresponding rubbing surface of the moving element and an opposed inclined surface parallel to a support surface of support means fixed to the support, the inclined surface cooperating with the support surface and actuating means connected to the pad for urging the pad in a direction substantially opposed to the direction of movement of the moving element. The two sub-assemblies are oriented in opposite directions on each side of the moving element. Each sub-assembly includes means for ensuring, in each direction of movement of the moving element, that one of the pads is selectively rendered integral with the support.

Brake pedal actuator

Abstract: A removable brake pedal actuator for applying a force to conventional vehicle brake pedals in accordance with a control signal for brake testing purposes is described. The actuator includes a frame which rests on the vehicle floor board and is held in place by an operator''s foot. A contact pad is provided for engagement with the brake pedal. A force transferring or coupling mechanism in the form of a pneumatically operated piston cylinder assembly is connected between the frame and pedal contact pad to provide a pedal force in response to the control signal. A contact sensor is mounted on the contact pad to provide an indication that the contact pad is in actual contact with the brake pedal. A pressure sensor is also carried by the contact pad for engagement with the brake pedal to provide a signal representative of the force applied to the brake pedal. A floor clearance probe or transducer is also provided on the actuator for providing an indication that the distance between the brake pedal and vehicle floor has decreased below a minimum acceptable value. The piston can be connected to a position indicating transducer such as a potentiometer for permitting the travel of the brake pedal to be ascertained during braking tests. The actuator may be a part of a servo control loop in which feedback signals representative of a desired braking effort or brake pedal pressure are used to control the actuator.

Partial lining disc brake

Abstract: A partial lining disc brake, preferably with a floating saddle, whose brake pads are supported at the inlet side and/or at the outlet side by projections which are axially displaceably guided with respect to the brake body in apertures matched to the projection as well as at a rail; at least one projection provided with a support surface is thereby arranged between the supports provided at the inlet side and/or the outlet side; the projection thereby engages with a countersupport surface in a recess or cutin matched thereto.

Self-energized disc brake parking brake integral with a non-energized service disc brake

Abstract: A disc brake assembly which contains a self-energized parking brake and a non-energized service brake. The service brake is actuated hydraulically, with fluid pressure acting on an inboard shoe peripheral section through the piston. An inboard shoe central section fitting within an opening of the shoe peripheral section is actuated mechanically through a self-energizing mechanism to provide parking brake capability. The two shoe sections have an overlapping construction such that movement of the peripheral section into braking engagement with the disc is transmitted to the shoe central section to also engage it with the disc. However, during the parking brake mode of operation only the central section engages the disc in braking relation. The brake mechanism is automatically adjusted as the brake shoes wear.

Blend back proportioning valve

Abstract: A motor vehicle hydraulic brake system includes a front brake circuit and a rear brake circuit. The rear brake circuit includes a blend back proportioning valve which controls the pressure in the rear brake circuit. The blend back proportioning valve includes a proportioning piston which cooperates with a valve seat to maintain increases in rear brake pressure proportional to but less than increases in master cylinder pressure between a first predetermined pressure and a second predetermined pressure. A blend back spool moves the valve seat away from the proportioning piston to equalize master cylinder pressure and rear brake pressure when the second predetermined pressure is reached.

Engine retarder brake

Abstract: An engine retarder brake including a cam operated hydraulic actuator for operating a valve in the combustion chamber near the end of the compression stroke to discharge compressed air and operate the engine as a brake for the vehicle.

Differential and brake assembly with parking brake for differential outputs

Abstract: A final drive differential and brake mechanism for a vehicle in which the differential has two outputs, one for each drive axle, and a disc brake pack is arranged to brake both outputs to provide a service brake vehicle. In one embodiment, the outputs also have disc plates cooperating with pawls providing a parking brake arrangement. In another embodiment, the disc pack is mechanically actuated to provide a parking brake. The disc pack is liquid cooled and a cooling liquid pump is driven by the differential output through a gear arrangement which provides a stepped up speed for the pump.

Liquid cooled disc brake

Abstract: A full lined liquid cooled disc brake for a rotating shaft. The brake has a brake housing comprising two annular housing members fastened together at their outer circumference and providing a central opening. The shaft or a sleeve member connected with the shaft extend in this opening carrying at least one lamination. The brake housing may have an opening at the outer circumference for easily replacing the lamination without opening the coolant circulation. The brake has annular brake rings on opposite sides of and opposing a lamination. Each brake ring is cooled on its side opposite from its braking surface with coolant flowing therethrough. A continuously operable adjusting mechanism for taking up play may be included. The brake may include both a mechanical and a hydraulic operating mechanism for urging the thrust rings towards each other to operate the brake.

Conveyor brake roller

Abstract: A brake roller for conveyor systems wherein a tube rotates about a stationary shaft, and a speed multiplying transmission within the tube powered by the rotation of the tube operates centrifugally operated friction brake members to prevent an excessive rate of tube rotation. Positive drive means are interposed between the tube and the transmission, and the friction brake members centrifugally operated are so constructed as to make the most efficient use of the centrifugal forces available.

Self-energizing bicycle brake

Abstract: A self-energizing bicycle brake, comprising a mounting yoke to mount the brake to a bicycle frame adjacent a wheel rim of the bicycle, brake block support arms connected to the yoke on opposite sides of a wheel of the bicycle and movable both toward the wheel and in the direction of travel of the wheel, brake blocks carried by the arms on opposite sides of the wheel and movable with the arms toward the wheel and into engagement with the rim of the wheel, so that upon engagement of the brake blocks with the wheel rim, the frictional drag between the brake blocks and wheel rim energizes the brake blocks into more firm engagement with the wheel rim, and an actuator connected with the brake blocks to actuate the brake blocks into engagement with the wheel rim.

Pressure fluid vehicle brake anti-lock system with independent right-left control

Abstract: To prevent excessive yaw torques if the road condition differs beneath the sides of the vehicle, in a vehicle brake anti-lock system which has wheel acceleration and deceleration sensors, separately and respectively associated with the wheels on the right, and left side of the vehicle, an interlock is provided which permits only gradual pressure rise on the brake cylinders of the wheels on both sides if the anti-lock system on one side has responded; typically, a pulse source is provided gradually, by pulsed interruption, increasing wheel braking effort after the anti-lock system has responded by response of the wheel deceleration sensor, this gradual increase controlling the application of pressurized brake fluid to brakes at both sides of the vehicle.

Friction pad for disc brake assembly

Abstract: A friction pad for a disc brake assembly has a stainless metal sheet overlying the back plate of the pad with the peripheral ends of the sheet elastically bent over the ends of the back plate along at least that part of the pad whose end face a fixed guide surface of a fixed support member which mounts the friction pad for movement toward and away from the rotatable braking disc.

Solenoid powered brake pressure modulator

Abstract: A brake pressure modulator for a hydraulic brake system in which the modulator is powered by a solenoid. The solenoid reciprocates a plunger to pump hydraulic fluid to the brakes to increase the pressure after the brakes have been released to avoid a wheel lock condition. The solenoid also acts when it is energized to isolate the master cylinder from the brake applying wheel cylinder and at the same time opens communication between the wheel cylinder and a reservoir to relieve pressure and release the brakes.

Air brake antiskid control

Abstract: An antiskid control valve for use with an air brake system on a vehicle which also includes an antiskid control system capable of detecting actual or potential locking of the braked wheels and providing a signal to actuate the antiskid valve. The antiskid valve provides for unrestricted operation of the brakes by delivery of air from a reservoir to brake actuating chambers until a signal is received of a potential wheel lock at which time the brakes are automatically released and further delivery of air from the reservoir to the brake chambers is prevented until the braked wheels resume rotational speed. After the wheel lock condition is avoided, the brakes are reapplied at a controlled rate due to a restriction in the line delivering air from the reservoir to the chambers for operation of the brakes.

Load-dependent two-circuit brake for vehicles, especially for trucks, busses or the like

Abstract: A load-dependent two-circuit brake for vehicles, especially for trucks, busses or the like which includes a load-dependent control valve arranged in the first brake circuit containing the rear-wheel brakes while another control valve is coordinated to the second brake circuit containing the front wheel brakes which has a predetermined transmission ratio and which is adapted to be acted upon by the control pressure in the first brake circuit in such a manner that the transmission ratio is adapted to be changed in the same sense as the control pressure in the first brake circuit.

Ratchet actuated brake wear compensation

Abstract: A pneumatically actuated brake system employs a lever, and means responsive to lever swinging to receive primary force transmission via one portion of the lever for effecting advancement of a brake part into braking engagement with a moving part such as a disc, and to receive auxiliary force transmission from another portion of the lever to displace the brake part toward the disc in compensating relation to the degree of brake part wear, whereby the range of lever swinging may be quite limited.

Automotive wheel brake anti lock system

Abstract: To prevent skidding, particularly of the driven wheels, an acceleration signal of the driven wheels is provided which is applied to at least two, preferably three or four threshold switches which have different responses to levels of wheel acceleration or deceleration; a first threshold switch, when responding to wheel deceleration, controls interruption of supply of pressurized brake fluid to the wheel brakes and bleeding of pressurized brake fluid to lower braking effort; a second threshold switch responds to wheel acceleration to prevent unduly long draining of pressurized brake fluid and thus loss of braking effort; preferably a third threshold switch is provided responsive to only a low level of wheel deceleration to prevent draining of pressurized brake fluid and hold braking effort at a level below skidding. Preferably, a pulse source is provided to permit pulsed application of pressurized brake fluid to the wheel brakes and thus gradually increase wheel braking pressure to further increase braking effort until the first deceleration switch again responds.

Worn brake lining detector

Abstract: A fail-safe detector circuit for detecting a worn condition of the friction linings mounted on the brake pads of a disc brake assembly. A conductor loop project through each brake pad into the lining to a point defined as the working limit of the lining. When the lining wears down to this working limit, an alarm is energized. The conductors embedded in the linings are connected in a series circuit with a fuse and a relay coil. Connected in parallel with this series circuit is an alarm circuit consisting of the relay contacts and an alarm device. Under normal operating condition, current from a battery flows through the series circuit to energize the relay and hold open the relay contacts, so that the alarm device is not energized. When either one of the linings wears down beyond the working limit, the associated embedded conductor loop electrically engages the rotating disc of the brake assembly, thereby short-circuiting the series circuit and causing the fuse to blow and open the series circuit so that the relay coil is de-energized. Consequently, the relay switch contacts in the alarm circuit close to permit energization of the alarm device by the battery.

Proportioning valve with pressure limiting

Abstract: A proportioning valve is installed in the rear brake line of the vehicle equipped with separate brake hydraulic systems for the front and rear brakes. The proportioning valve permits uninhibited fluid communication to the rear wheel brakes until a first pressure level is attained whereupon the valve restricts flow of fluid to the rear wheel brakes to establish a lower fluid pressure level in the latter than the fluid pressure level communicated to the front wheel brakes. An additional valve in the rear brake line is responsive to the pressure differential across the proportioning valve to terminate fluid communication to the rear wheel brakes when the pressure differential across the proportioning valve attains a predetermined amount. This feature enables the relationship between the braking pressure delivered to the rear wheel brakes and the braking pressure delivered to the front wheel brakes to approximate closely the ideal pressure relationship. In one embodiment of the invention, the point at which fluid communication to the rear wheel brakes is initially restricted by the proportioning valve varies as the rate of deceleration of the vehicle varies. In a second embodiment of the invention, the pressure level at which the proportioning valve initially restricts fluid pressure communication to the rear wheel brakes varies as the load carried by the rear axle of the vehicle varies.

Starting device for heavy vehicles

Abstract: A vehicle with a transmission shiftable in steps by means of friction clutches includes starting unit at the input or output of the transmission comprising a planetary gear having several components, wherein a first of the components is driven. A braking device has at least one brake member connected with a second of the components for rotation therewith, fricton bodies for braking the brake member by dry frictional contact, and actuating means and cooling means for the friction bodies. An actuating system is provided for the transmission and the starting unit which, in a first mode of actuation, holds the brake member fixed on a stationary structural member by means of the friction bodies during automotive operation, and in a second mode of actuation, slidingly brakes the brake member when starting the vehicle. The actuating system in the first mode of actuation briefly releases the brake member from the stationary member during the shifting process so as to suppress any shock produced during shifting.

Self adjusting disc brake with parking brake

Abstract: Mechanical actuating means for a disc brake caliper includes a shaft rotatably journalled in the housing and having a threaded portion which threadedly engages a nut having integral circular plate. A second circular plate is interposed between the integral plate of the nut and the conventional hydraulic actuating piston. A one-way clutch is provided by ratchet teeth on the adjacent faces of the integral plate and second plate. A ball and ramp arrangement is provided between the second plate and the piston. Rotation of the shaft in one direction causes the nut to rotate therewith and the ratchet teeth to rotate the second plate which in turn causes the ball and ramp arrangement to move the piston axially to carry the brake shoe into engagement with the disc. Upon return of the shaft to its preactuation rotational position clearance will result in the mechanical actuating mechanism to an extent corresponding to the lining wear encountered. A spring causes the nut to rotate on the shaft in the direction axially toward the disc as permitted by ratcheting of the one-way clutch so that the effective length of the mechanical actuating mechanism is extended to adjust for the wear. Wear adjustment also occurs upon hydraulic actuation of the brake.

Hydraulic brake system for trailers connected with mechanically braked towing vehicles

Abstract: A hydraulic brake system for a trailer which is coupled to a mechanically braked towing vehicle has an electronic regulator circuit receiving signals from a first transducer which indicates the magnitude of the mechanical braking force and from a second transducer which indicates the fluid pressure in the cylinder or cylinders of the hydraulic brake system. The output of the regulator circuit is connected to one or more electromagnetic control valves which control a distributor valve serving to connect the pump with the brake cylinder or cylinders, with a return line and/or with one or more consumers. The regulator circuit insures that the fluid pressure in the brake cylinder or cylinders is always proportional to the mechanical braking force.

Load-dependent braking device for conveying systems

Abstract: A load-dependent braking device for conveying systems having a primary brake with a fixedly adjusted braking moment and a secondary brake with variable braking moment, the braking moment of the secondary brake being adjusted in dependence on the loading moment acting upon a drive device or machine for the attainment of a braking deceleration or retardation independent of load. A rotatable brake part of the primary brake is rigidly connected with a fixed brake part of the secondary brake. A rotatable brake part of the secondary brake, which can be pressed by brake linings or pads against the fixed brake part through the action of spring pressure, is raised or lifted-off as a function of the change of speed occurring during the braking of the drive machine by a rod or linkage arrangement pressed by means of spring force against a setting cam. The setting cam is arranged on a flywheel or inertial disk mounted to be freely rotatable upon a drive shaft of the drive device and actuates the rod arrangement in proportion to the angle of displacement between the flywheel disk and the drive shaft in opposition to the spring force.

Trailer auxiliary hydraulic brake system

Abstract: A trailer auxiliary hydraulic brake system completely independent of the conventional brake system and including a wheel-driven hydraulic pump, an accumulator, a main brake control valve, a back-up release valve and a fluid reservoir. An automatic actuation member, responsive to a longitudinally slidable connection between the tractor and trailer, controls the flow of pressurized hydraulic fluid to and from the trailer brakes. The trailer auxiliary system, in addition to automatically energizing the trailer brakes, also includes an assembly for manual actuation of the main brake control valve thus permitting emergency braking, pulsating braking and use of the system as a parking brake.

Vehicle pilot pressure controlled brake system with wheel lock control modulating means

Abstract: An air brake system of the type used in some trucks includes an air compressor, suitable wet and service tanks, a brake application valve controlled by the brake pedal and actuated by the vehicle operator, and a relay valve receiving pilot pressures from the brake application valve and controlling the admission and release of air pressure from the service tank to the brake chambers at the brakes of the wheels to be braked. The rate of brake release and the rate of brake application are controlled by a valve arrangement which in turn is energized and deenergized in accordance with the needs of the vehicle brake system in order to prevent wheel lock. Under normal conditions of braking operation, the vehicle operator controls the brakes by actuating a brake application valve, which generates the pilot pressure, which in turn controls the action of a relay valve, which in turn admits the necessary amount of air pressure to the vehicle brake actuating chambers to operate the vehicle brakes, and releases the air pressure from those brake chambers when the brakes are released, all in accordance with the pilot pressure supplied to the relay valve. The application of pilot pressures to the relay valve is controlled independently of the brake application valve when wheel lock control signals are being generated to prevent wheel lock, so long as the vehicle operator maintains the brake application valve in a position to brake the vehicle.

Method and arrangement for applying oscillating braking pressures to vehicle wheels

Abstract: An arrangement for modulation of the brake pressure of vehicle wheel brakes comprises a modulator connected in the brake pressure feed line for varying the brake pressure and switch device controlling the modulator to oscillate the brake pressure.

Closed loop type disc brake

Abstract: A disc brake for a motor vehicle, which includes a braking disc rotatable with a vehicle wheel, a hydraulic cylinder having inner and outer pistons, directly and indirectly actuated friction pads located adjacent to both sides of the braking disc and forced against the braking disc when fluid under pressure is supplied to the disc brake from a master cylinder, a yoke which is adapted to carry the pressure of the fluid to the indirectly actuated friction pad, and a braking torque absorbing structure adapted to absorb a braking torque on the friction pads during operation whereby the yoke is freed of a duty of bearing the torque and permitted to serve only to carry the pressure of the working fluid to the indirectly actuated friction pad. The disc brake further includes a pair of guide means provided between the braking torque absorbing structure and the yoke for guiding the yoke in a direction substantially parallel to the axis of the braking disc. The disc brake also includes a ringlike insert which is interposed between the bottom wall of the outer piston and the side edge of the yoke to permit the yoke to move in a direction substantially parallel to the axis of the braking disc without rocking or vibrations.

Hydraulic bicycle brake assembly

Abstract: A hydraulic bicycle brake assembly that includes a pair of arms that support a pair of brake pads on first ends thereof, with the arms being pivotally supported from a bicycle in such a position that the pads may be brought into frictional braking contact with a portion of a rotating wheel of the bicycle when second ends of the arms are moved transversely relative to one another. Movement of the second arms to dispose the brake pads in a braking position is accomplished by the rider of the bicycle decreasing the volume of a hollow body that holds a quantity of hydraulic fluid. The hydraulic fluid is discharged therefrom by a flexible tubular conductor to a hydraulic cylinder that occupies a fixed position relative to a bicycle. A piston and piston rod are slidably movable on the cylinder and as fluid is discharged into the cylinder the piston and piston rod are moved in a direction to so pivot the arms that the brake pads are forced into pressure friction contact with a portion of a rotating wheel of the bicycle. By the use of a hydraulic fluid in the above described manner, the pads can be forced into greater frictional pressure contact with a rotating portion of the wheel than is possible by conventional mechanical means now in use, and the bicycle can accordingly be brought to a quicker stop than is now possible.

Hoist drum control

Abstract: A hoist cable drum control having a spring set, normally engaged drum brake and a variable torque converter for driving the drum, in which a control device initiates cable take-up and slips the brake, and drum rotation is sensed to thereafter disengage the brake. Control forces on the converter and the brake are proportional so that as torque is reduced the brake comes on smoothly. Cable is payed off the drum through a reverse driving hydraulic motor actuated simultaneously with release of the brake and capable of being overridden by the torque converter to control ''''lowering'''' movement. A clutch engaged by initial operation of the control device permits multiple drums to be driven by the converter.