Showing papers on "Brake pad published in 1977"

Noise damper for disc or drum brake - is solid or segmented graphite insert ring cast into disc

Abstract: The disc (3) of a disc brake is a casting in which a ring of graphite (4) is placed in the mould during casting. Instead of a single ring the graphite may be applied in the form of small separate circumferential discs or segments. The method is equally applicable to drum brakes, with the graphite cast into the flat end surface of the drum. The graphite damps out the vibrations which cause brake 'squeal' which is often a source of annoyance with many road vehicles. As an alternative to graphite, carbon-rich materials or plastic containing carbon may be used.

Hydraulic brake booster for a vehicular brake system

Abstract: A hydraulic brake booster for a vehicle brake system which has a control valve, actuatable via an excursion-limiting spring, which directs the flow of pressure medium from a supply source as an auxiliary force means. The excursion-limiting spring disposed subsequent to the brake pedal provides for sensitive response on the part of the control valve. In event the auxiliary force fails, the excursion-limiting spring is made ineffective so that pedal travel does not occur without being utilized. A shut-off mechanism is included to make the excursion-limiting spring ineffective has a shut-off member dependent on brake actuation and to which a motion pulse dependent on brake actuation can be imparted in the area of its outset position. In this manner, the shut-off mechanism is used during each occurrence of braking and thus cannot seize as a result of corrosion.

Brake system and apparatus and method therefor

Abstract: A brake system and method of braking including brake pads made of an "anti-friction" material, which may be lubricated, to establish a constant wet coefficient of friction in use with braking force applying apparatus for applying relatively high braking force which may be obtained in part by the energy of the moving member to which the braking force is applied.

Combined antiskid and load-dependent brake control system for a motor vehicle

Abstract: A combined vehicle antiskid and load-dependent brake control system in which digital control of the individual wheel brake pressure regulating valves is provided. These regulating valves may be operated individually or on a per axle basis to vary the brake pressure independent of the operator-controlled brake valve device. The load-dependent brake control portion of the system includes electronic control circuitry that is subject to the output signal of sensors, which monitor pressure supplied by the brake valve device, actual brake cylinder pressure and the load supported by the vehicle rear axle, in order to operate the regulating valve of at least one wheel brake cylinder such as to cause the wheel brake pressure to follow a predetermined curve that differs from a normal brake pressure buildup curve.

Cooling fluid circulation in an annular disc brake

Abstract: Fluid passages machined in the annular brake piston and in the outboard brake ring of a wet disc brake system allows the circulation of cooling and lubricating fluid. An annular disc brake will deliver cooling fluid to the circumferential periphery of the brake disc operating cavity where the fluid relief passages machined in the annular brake piston and in the outboard brake ring will allow the passage of this fluid out of the brake disc operation cavity thus preventing the stagnation of cooling fluid in the brake disc operating cavity.

Cam actuated disc brake

Abstract: An air-actuated disc brake develops the required force magnification to operate disc brakes from an air pressure chamber using push-pull rods driving a pair of cam levers applying normal force to one shoe plate of the disc brake. Clamp action is carried through to an opposing brake shoe plate by a caliper. The entire air applied disc brake is mounted as a unit to the axle flange. An automatic adjuster compensates for brake lining wear. The cam levers are pivotally mounted to a movable cam carrier located between the caliper and one brake shoe plate.

Remote control circuit for electric trailer brakes

Abstract: A remote control circuit for regulating current to electric trailer brakes as a function of the brake fluid pressure within the tractor brake system or in response to activation of a control arm by the tractor operator. A hydraulic transducer is connected directly to the tractor brake system to produce an electrical signal at the control circuit which varies as a function of the hydraulic fluid pressure. An electromagnetic, pressure-responsive circuit is also provided which is operatively connected to the trailer brakes and which retards movement of the operator control arm at the control circuit in proportion to the brake torque applied at the trailer.

Sliding caliper disc brakes

Abstract: In a disc brake such as a sliding caliper disc brake, the caliper is mounted for movement with respect to a torque plate by pin assemblies extending into aligned openings in the caliper and torque plate. The pin assemblies are of multi-part construction, parts of the pin assemblies which provide for movement between the caliper and torque plate being able to remain undisturbed when the caliper is removed from the torque plate. Another feature is that the openings in the caliper or the torque plate are oversize, so that the pin assemblies are received as a free fit, and the pin assemblies are clamped in the oversize openings by interengagement of screw threaded portions. Sliding surfaces are provided either directly by the shanks of pins or by separate bushes which may be resilient. The construction is such that the pin assemblies are relieved of clamping forces and drag forces when the brake is actuated.

Brake apparatus using light conductors to control remote wear indicators

Abstract: A brake apparatus having a friction pad riveted to a brake shoe and a light conductor extending through the pad within its working thickness. As the pad is worn away, the light conductor is severed by the abrasive action of a rotatable member causing a remote indicator, responsive to the interruption of light transmission through the conduit, to signal the need to replace the pad. The configuration of the light conduit insures that the signal will be given at the appropriate time despite misalignment between the pad and the rotatable member.

Brake anti-locking modulator with reapplication control

Abstract: A modulator apparatus for use in a rotating member braking arrangement which has a fluid pressure responsive brake to which pressurized fluid is supplied for braking the rotating member, with the anti-locking modulator interposed between the brake and the source of supply of fluid pressure for cyclically decreasing and increasing the fluid pressure supplied to the brake. The modulator valving is constructed in such a way as to control the rate of rise of fluid pressure applied to the brake, thereby governing reapplication of braking forces by the brake and aiding in optimizing brake performance.

Squeal preventing disc brake pad assembly

Abstract: A disc brake pad assembly includes a wire mesh screen 6 between the friction pad backing plate 3 and a shim 5 to reduce squeal when the brake piston 10 applies pressure to the backing plate to urge the friction pad 2 against the disc 1. The squeal suppression may be enhanced by applying a lubricant to the wire mesh screen.

Automatic transmission for automobiles

Abstract: An automatic transmission for automobiles having a gear means, a clutch and a brake, the engagement and disengagement of the clutch and the brake being changed over for shifting speed stages, wherein one of the mutually engageable friction elements of the brake is mounted to a housing of the transmission so as to be rotationally shiftable with respect to the housing through a small angle so that forward or backward rotary shifting of the friction element operates a transducer which generates an electric signal which, by means of an electric circuit means, operates a timing valve which is electrically controlled and controls supply or exhaust of oil pressure to or from the brake.

Disc brake caliper and supporting member

Abstract: This invention in general relates to a disc brake having a caliper attached to a support secured to a structural part of a vehicle or an attachment thereto to brake the vehicle by causing the members of the caliper to press friction pads against both sides of a disc rotor which is connected to the vehicle, and, more particularly to an improvement in the disc brake of such a type effected by removing the protrudent parts that have conventionally been provided on the front of the support confronting the disc rotor and by thus making the support into a shape that permits insertion of the disc rotor through the front thereof for easy mounting of the disc brake on the vehicle. The improved construction of the disc brake is particularly suitable for use in large vehicles.

Double-acting disc brake

Abstract: Normal operating fluid pressure is applied behind a brake release piston in a first pressure chamber in the brake assembly. Variable operator control fluid pressure is applied in a second chamber of the assembly behind a brake applying piston which opposes the brake release piston in the assembly. A dry chamber for stator and rotor discs of the brake lies between the two pistons with a skirt of the brake release piston surrounding the discs and engaging a pressure plate forming the endmost stator disc adjacent to the brake applying piston. Brake applying springs are intervened between the pressure plate and brake applying piston to impart to the disc brake a fail-safe capability as well as a brake "on" condition when the system is depressurized.

Disc brake device for use in a vehicle

Abstract: A disc brake device for use in a vehicle which comprises a disc rotor having annular disc brake surfaces, a wheel hub for supporting the disc rotor and being rotatably supported by a wheel axle via bearings, a stationary dust cover for covering both an outer surface of the disc rotor and an end surface of the wheel hub, and a mud-guard cover which is fixed to the dust cover and which has a peripheral edge portion extending to a position adjacent to the surface of the disc rotor. This disc brake device can prevent muddy water from entering into the inside thereof, thereby preventing the lips of a seal and one of the bearings mounted in the device from being damaged by external muddy water. In addition, the lubricating oil for the bearing can be prevented from degradation by such muddy water.

Hysteresis brake assembly

Abstract: A hysteresis brake assembly comprising a fan member, a vaned heat dissipating cover member, a pair of pole members, a pair of hub members and a disc shaped ferro-magnetic brake member. The fan propells air through holes provided in the cover and one pole member and the air is directed by vanes on a first hub member to flow (1) in part over one side of the brake disc and (2) in part through holes in the brake disc to the other side of the brake disc, where a second vaned hub directs the air over the other side of the brake disc; thereby cooling the brake disc on both sides. After cooling the brake disc, the air is forced outward from the brake assembly through escape holes provided in the cover member and one pole member.

Brake disc and process for producing the same

Abstract: A brake disk and process for producing the same which is particularly suitable for use on motorcycles A stainless steel material of particular chromium content is subjected to a heat-treating and press-quenching step to form a brake disk having a sufficient hardness required for the function of a brake and being of favorable appearance for use on motorcycles

Means for reducing the gap between rotor-backing plate interface during brake depressurization

Abstract: In an aircraft multiple disc brake assembly utilizing carbon composite rotors and stators, an excessive gap occurs at the rotor-backing plate interface during brake depressurization. This gap allows oxidation of the carbon material at the interface thereby reducing friction performance and increasing wear. A spring is disposed between the backing plate and its friction surface thereby axially moving the friction surface closer to the surface of the adjacent rotor to reduce this gap.

Solenoid operated cone brake

Abstract: In an oscillograph, a roll of recording paper is supported on a rotatable shaft such that the strip of recording paper passes over a metering roller driven at constant speed by a drive motor. Means to brake the shaft and prevent overrun of the recording strip comprises a magnetic solenoid-operated cone brake, adapted to momentarily place braking effort to the shaft. The cone brake has an appropriate friction liner, and serves to stop the roll, and prevent overrun. The braking effect is controlled by an electrical circuit that provides braking current to the solenoid for a selected short interval of time, sufficient to brake and stop the roll. At other times, there is no power applied to the brake.

Sliding caliper-type disc brake and support structure therefore

Abstract: A floating caliper disc brake for a motor vehicle according to this disclosure comprises an anchor plate, a pair of brake pads mounted on the anchor plate and a caliper slidably mounted on the anchor plate by means of a pair of bolts or pins. The brake is constructed such that removal of one of the blots or pins enables the caliper to be pivoted on the other bolt or pin to a position in which it is clear of the brake pads to permit access to the brake pads and enable their replacement.

Cam operated disc brake

Abstract: A disc brake assembly comprising a frame including a caliper and brake pads carried thereby in laterally spaced relation to receive a disc therebetween. An actuator including first and second plunger members located for relative lateral displacement to effect displacement of the pads relatively toward one another, thereby to brake the disc and a lever extending between the plunger members with one of the members having a convex nose received in a first wedging bearing formed in the lever. The lever being pivotably mounted about a pivot on the frame for wedging movement between the members to shift and effect relative displacement of the members to brake the disc.

Apparatus in vehicles with compressed air brake systems for actuating the brake system on the detection, by a sensor, of an obstacle in the path of the vehicle

Abstract: Compressed air brakes on a vehicle are actuated by an obstacle sensor switch via electromagnetic valves to draw compressed air from both parking and service brake compressed air supplies for operation of the service brakes to avoid depletion of the service brake air supply. Also, the parking brake cylinder may be rapidly emptied from control of the obstacle sensor by means of a rapid empty valve connected to the brake cylinders of the parking brake circuit.

Stainless steel brake disc structure

Abstract: A brake disk and process for producing the same which is particularly suitable for use on motorcycles. A stainless steel material of particular chromium content is subjected to a heat-treating and press-quenching step to form a brake disk having a sufficient hardness required for the function of a brake and being of favorable appearance for use on motorcycles.

Aircraft brake torque limiter

Abstract: In an aircraft multiple disc brake assembly, an excessive total brake torque can be experienced during favorable, dry, conditions. To limit the brake torque to a predetermined maximum, the plurality of conventional brake piston assemblies are modified to provide a pressure responsive surface area which is in an opposing relationship to the braking force. When a predetermined amount of braking torque is experienced, conventional electronics employing strain gauge sensors control a solenoid valve to vent pressurized brake fluid to the opposing surface area thereby reducing the braking force and limiting the total braking torque experienced by the brake assembly to a predetermined maximum amount. The brake pressure is not affected by this system.

Hydraulic pressure brake system with spring apply pressure release parking brake mode

Abstract: Back pressure from the hydraulic power brake assembly of a vehicle acts on brake actuators to hold off spring apply brake assemblies through a vehicle operator actuated control valve When the parking brakes are to be actuated, the operator turns the control valve so that it vents the hydraulic hold-off chambers to the hydraulic power brake sump, permitting the springs to apply the parking brakes The hydraulic service brake system includes pistons in the brake actuators for normally actuating the brakes under pressure generated by the hydraulic power brake assembly The pistons are mechanically acted upon by the spring apply forces when the parking brakes are actuated The parking brake mode therefore uses the same wheel brake elements as does the service brake mode

Brake actuator for bicycles and the like

Abstract: A coaster brake for a bicycle has a brake operating lever consisting of a yoke and integral arm coupled to the pedal crankshaft of the bicycle by a self-acting unidirectional friction clutch, formed by a coil spring embracing the crankshaft. In order to facilitate its insertion into the crankshaft housing, the lever has no dimension greater than the internal diameter of the housing. The spring has two portions, one on either side of the yoke, the wire forming the part of each portion nearer the yoke being of greater cross section than the part further from the yoke. The lever moves a brake actuating rod or cable actuating a wheel brake which may be of several different types.

Brake apparatus with a combined brake cylinder and reservoir

Abstract: This invention relates to a novel railway vehicle brake apparatus that comprises a brake cylinder device having two tandem-connected pistons of unequal size, the larger of which is provided with a check valve and cooperates with a hollow cylindrical body in which it is slidably disposed to form on its respective opposite sides two fluid pressure storage reservoirs wherein is stored fluid under pressure for effecting a brake application. This brake apparatus further comprises a novel brake control valve device that is so responsive to a reduction of pressure in a train brake pipe as to first cause simultaneous shifting of both pistons in a brake-applying direction and a transfer of fluid under pressure from one side of the larger piston to the other until a chosen braking force is transmitted through brake rigging to press brake shoes against the wheels of a vehicle. Thereafter, the control valve device is operative to release fluid under pressure from the one side of the larger piston to atmosphere to increase the braking force pressing the shoes against the wheels.

Electromagnetically releasable spring pressure brake - has armature disc of two radial parts between electromagnet and friction lining of rotor

Abstract: The disc brake rotor (3) is located between two axial pressure faces. Axially movable pressure rings (1, 2), forming the two armature parts, are coaxial and they form the pole plate of an electromagnetic ring (8). Each pressure ring is provided with its own set of compression springs (7, 9). When the electromagnet is energised, the pressure rings are lifted off the friction disc assembly (3). By reducing the voltage in the magnetic coil, the inner pressure ring escapes the magnetic force field and applies a friction force on the brake disc. When the voltage is further reduced, the outer pressure ring follows, thus the total brake force is applied in two stages.

Torque reaction operated bicycle braking system and mounting structure

Abstract: The invention contemplates a bicycle-braking system in which the rear-wheel brake is selectively operable, in which rear wheel braking torque is the means of actuating the front brake, and further in which substantial force-amplification characterizes the actuating connection between (a) rear-wheel torque-reaction pick-off and (b) front brake actuation. Rear-wheel braking torque is noted by physical displacement against a spring, so that if front-wheel brake torque becomes so effective as to substantially reduce rear-wheel brake torque, the spring will automatically react to reduce the magnitude of front-wheel brake effort.