Showing papers on "Disc brake published in 1989"

Spot-type disc brake

Abstract: There is disclosed a spot-type disc brake having a brake carrier protruding over the brake disc and brake shoes on each side of the disc, one shoe being directly actuated by a hydraulically actuated piston and the other shoe being actuated by a brake caliper embracing the disc. A sliding guide is provided to connect the caliper to the carrier so that the caliper is movable relative to the carrier towards and away from the disc. The sliding guide includes guide portions having grooves in the caliper and projections in the carrier to engage the grooves. An opening is provided in the caliper so that the brake shoe adjacent the actuating device can be removed without disassembling the caliper from the carrier. The guide portions have a limited length so that when the caliper is shifted into the space left by the removed brake shoe, the guide portions can be disengaged. This arrangement provides a positive arrangement to prevent the caliper and carrier from separating during operation without additional components in the guide portions as is present in similar prior art disc brakes.

Automatic adjusting mechanism for a disc brake assembly having a mechanically actuated parking brake

Abstract: A disc brake mechanism, including an integral mechanical parking brake assembly and having automatic wear adjustment features, is disclosed. The adjusting mechanism comprises an axial thrust screw having one end exposed to atmospheric pressure to create an axial hydraulic differential pressure acting thereacross. An adjusting nut is threadably received on the thrust screw and normally engages a hydraulic actuating piston such that the adjusting nut is free to rotate with respect to the thrust screw and piston. Hydraulic pressures acting upon the thrust screw create opposing forces, the resultant of which is applied to a resisting mechanical spring. So long as the hydraulic pressure is below a predetermined value, the resultant hydraulic force acting upon the thrust screw is insufficient to overcome the resisting spring force and the thrust screw remains stationary. As the hydraulic piston moves upon hydraulic actuation of the brake, the adjusting nut is biased to rotatingly advance relative to the thrust screw, thereby adjusting for friction pad wear. As hydraulic pressure increase above the predetermined value, the resultant hydraulic force acting upon the thrust screw is sufficient to overcome the resisting mechanical spring, and the thrust screw in combination with the adjusting nut translates toward the piston. This causes the adjusting nut to frictionally engage the piston preventing any further advance of the adjusting nut relative to the thrust screw, thereby ending the adjustment cycle.

Friction pad for use with disc brake

Abstract: Improved friction pads for use with disc brake. The pad has a central main portion and a peripheral portion which are formed of different matrices having different compositions. The matrix of the central main portion contains a hard substance or substances having a specified range of hardness whereas the matrix of the peripheral portion does not contain such hard substances or contains in only a limited smaller amount than the central main portion. This prevents the brake disc from wearing due to friction with the pad and thus avoids uneven abrasion of the brake disc.

Drive control for walk-behind mower with hydrostatic transmission

Abstract: A self-propelled lawn mower employs a hydrostatic transmission and differential to power rear drive wheels which are situated behind a forward mowing deck. The hydrostatic drive has infinitely variable adjustment of speed from reverse, through neutral, to a maximum forward speed. There are independent disc brakes for the drive wheels, with right and left brake levers situated adjacent the operator hand grips. An engine has its center of gravity behind the drive wheel shaft to balance the weight of the mowing deck. Left and right thumb-operated control levers are rockably mounted on the handle bar assembly, adjacent the inboard side of the right and left hand grips. This arrangement permits one-hand control of the transmission speed with either hand, while actuating the respective brake lever with the same hand, making one-hand brake-turning of the mower possible. The engine output shaft has a pulley connected by belt drives to the blades and to the hydrostatic drive.

Vehicular brake material collection system

Abstract: A vehicular brake material collection system collects brake material dust particles emanating from both the brake friction material and the brake rotary member in a disc brake or a drum brake. The system includes a particle collection chamber around and/or suction nozzles in proximity to the friction material, the chamber and/or nozzles being connected to a suction system that carries such particles into a filter or separator as the vehicle operates. The particles are thereby collected for later safe removal and disposal.

Method of increasing the service life of aircraft carbon disk brakes

Abstract: The invention is directed to a method of increasing and/or extending the operational service life of an aircraft brake disk stack by selectively limiting the number of brake assemblies which comprise the aircraft landing gear configuration and which are put into operation during the time the aircraft is on the ground and subject to taxi-snub braking cycles while also providing that all of the brake assemblies of the total available on the aircraft are operational during landing of the aircraft.

Analysis of temperature field in brake disc for fade assessment

Abstract: Simulation of the temperature distribution in a brake disc of a passenger car during fade cycles (repeated brake application) is carried out using Finite Element Method. Verification of the predicted values is done using a sophisticated inertia dynamometer. Effect of variable convective heat transfer coefficient, effect of mass of the mounting flange on the temperature distribution are also studied. From the investigation it is concluded that the present model can be used for the simulation of temperature distribution in rigid brake dises during fade test.

Disc brake pad

Abstract: An asbestos-free disc brake pad is provided by employing a cyanate ester-based resin composition as binder. The disc brake pad exhibits consistent braking properties over a wide range of operating temperatures and an improved service life. Also the serious pollution problem due to use of asbestos in the conventional brake pads is removed.

Integrated disc brake and drum brake construction

Abstract: The present invention comprises an integrated disc brake (50) and drum brake (120) construction. A support member (12) is supported by a vehicle axle (14) and extends radially outwardly to provide support for a housing (52) of the disc brake (50). The housing (52) is secured by bolts (93 or 94) to the support member (12), the housing (52) having through openings (54) for receiving rod members (75). The rod members (75) each have one end (76) secured to the support member (12) and a second part (90) and the other end has an opening (77) for an internal bore (78) extending therein. The disc brake (50) includes an axially movable yoke (60) attached to guide pins (82) extending into bores (78) of the rods (75) for slidable movement therein. The second part (90) extends radially to provide support for an inner brake pad (20) and may extend axially away from the housing (52) to provide an anchor support (91) for shoulders (132, 142) of drum brake shoes (130, 140). The support member (12) supports a mechanical actuator (121) which may be operated to bias the drum brake shoes (130, 140) into engagement with a drum portion (42) of the brake disc (40) in order to effect a parking brake operation.

Brake disc for disc brakes

Abstract: Eine Bremsscheibe fur Scheibenbremsen, insbesondere fur Kraftfahrzeuge, umfast einen Scheibenkranz (3) mit mindestens einem Reibring (4, 5) und einen Innentopf (2), auf dem der Scheibenkranz (3) befestigt ist. A brake disc for disc brakes, in particular for motor vehicles, comprising a wheel rim (3) with at least one friction ring (4, 5) and an inner pot (2) on which the disc rim (3) is attached. Der Scheibenkranz (3) und der Innentopf (2) bestehen aus Guswerkstoffen. The disc rim (3) and the inner pot (2) consist of cast materials. Damit der Innentopf und der Scheibenkranz den unterschiedlichen thermischen und mechanischen Beanspruchungen besser entsprechen und die Bremsscheibe auf einfachere Weise herstellbar ist, wird vorgeschlagen, das der Innentopf (2) aus einem Material mit hoherer Zugfestigkeit besteht als das Material des Scheibenkranzes (3). Thus, the inner pot and the pulley rim to the different thermal and mechanical stresses better match and the brake disc can be manufactured in a simpler manner, it is proposed that the inner cup (2) consists of a material having a higher tensile strength than the material of the disc rim (3). Der Scheibenkranz (3) ist mittels Verbundgiesen auf den Rippen (7, 14) des Innentopfes (2) befestigt, wobei das Material des Scheibenkranzes die Rippen (7, 14) in radialer Richtung formschlussig umgreift. The disc rim (3) by means of composite casting to the ribs (7, 14) fixed to the inner pot (2), wherein the material of the disc rim, the ribs (7, 14) engages positively engages in the radial direction.

Method and apparatus for increasing the service life of aircraft multiple disc brakes

Abstract: A system is disclosed for increasing and/or extending the operation service life of an aircraft brake disk stack by selectively limiting the number of brake assemblies which comprise the aircraft landing gear configuration (10) and which are put into operation during the time the aircraft is on the ground and subject to low speed taxi braking cycles while also providing that all of the brake assemblies (12) of the total available on the aircraft are operational during other portions of the landing and take off cycle of the aircraft.

Anti-roll device for vehicles

Abstract: An anti-roll device for vehicles, especially for those with standard gearshift, including a brake disc having ratchet gear on its peripheral surface; a link engageable with the ratchet gear; a solenoid valve connecting to and actuating the link and controlling the engagement between the link and the ratchet gear of the brake disc; a switch controlling the on and off conditions of the solenoid valve; a microswitch connecting to the solenoid valve; an indicating light controlled by the microswitch; and a buzzer, also controlled by the microswitch, connecting in parallel with the indicating light. The link is actuated by the solenoid valve to engage with the rachet gear of the brake disc so that the brake disc and the wheel of a vehicle can only rotate counterclockwise, therefore preventing the vehicle from sliding backward on an incline or a hill.

Bolt retaining hydraulic end fitting assembly

Abstract: A hydraulic end fitting of the type including a bolt for securing the fitting to a hydraulically actuated device such as a brake caliper and including a circular washer having a symmetrically deformed inner circumference to retain the bolt to the fitting until the bolt is secured to the device.

Brake or clutch disc assembly

Abstract: A disc brake or clutch assembly 10 having rotatable rotor discs 12 and non-rotatable discs 21, 22, 27 which are movable axially to engagement. The rotatable rotor discs 12 are secured to an annular splined mounting member 44 which has a plurality of grooves 49 therein to circulate cooling air. The rotor discs 12 have a plurality of holes 51 which enable air to flow between the rotor discs.

Floating friction brake

Abstract: A disk brake assembly wherein the floating caliper member houses an adjustable nut in which is mounted a power screw for actuating the carrier members and their brake pads into frictional engagement with a rotatable disk. The power screw has a cam connected to it, with the cam also adjustable mounted on an actuating lever to permit selected rotation of the cam to adjust the axial position of the power screw to compensate for wear.

Ring spinning machine

Abstract: The ring spinning machine has separate drives for the spindles, the delivery rollers and the other rollers of the drafting device. The inverters of the corresponding drive motors are fed from a D.C. intermediate circuit so that all the drives stop simultaneously, thus obviating thread breakages. A disc brake is electrically coupled to the intermediate circuit to prevent rotation of the delivery roller of the drafting device.

Motorcycle front and rear disc brake system

Abstract: A front and rear disc brake system for a motorcycle utilizes a first large diameter disc for the front wheel and a second disc of reduced diameter for the rear wheel. The second disc has an outer diameter less than the inner diameter of the first disc so that both discs may be stamped from the same sheet of material with a minimum amount of waste.

Cyclic brake disc overhaul technique and structure

Abstract: The cyclic carbon brake disc overhaul technique comprises the steps of splitting a worn carbon disc (10, 100 ) into two equal disc halvess (16, 116), machining the disc halves (16, 116) to a predetermined axial thickness, and then bonding the disc halves (18, 118) of predetermined thickness to a core member (22, 122). The disc halves (18) may include drive regions (20) at respective ends thereof, or the halves (118) may have the drive regions (112) removed therefrom. The core member (224) may have axially extending drive portions (225) such that the disc halves (118) of reduced radial length define wear grooves (227) with the drive portions (225).

Method of carrying out maintenace of multi-disc brake arrangement

Abstract: A multi-disc brake suitable for an aircraft has a stack of rotor and stator discs in which the discs of a set at one end of the stack each have a greater allowance for wear than the discs of a set at the other end of the stack whereby the group of discs are removed together from one end of the stack as a fully worn group at a brake servicing operation. An unworn group of discs is added to the other end of the stack.

Wind turbine operating system

Abstract: A variable speed wind turbine operating system comprises a speed limiting system comprising turbine 11, driving an alternator 16 via a gearbox 14, a controller 19 and a shaft mounted brake means 13 The turbine has a rated condition and a speed/torque characteristic such that when wind speed increase tends to run the turbine above its rated condition, the brake is applied to slow the turbine to a speed at which the blades are operating so inefficiently that further wind speed increase cannot increase shaft speed or torque unacceptably The brake may be a disc brake the hydraulic calipers of which are supplied with fluid pressure by a pump driven by the turbine In alternative arrangements the brake is replaced by means for retarding the shaft such as an electrical generator (Fig 5) driving a switchable resistive control load Alternatively generators having variable pole arrangements may be used (Fig 6) Alternatively two similar generators may be used with variable connections to a supply grid (Fig 7)

Wheel-brake arrangement for disc brake systems - has wheel rim wheel dish joined to disc carrier

Abstract: The wheel-brake arrangement is for disc brakes. The ring-shaped braking disc is formed as one piece with a brake disc carrier. The wheel rim (14) and wheel disch (4) are made as separate parts and in the transition area where the wheel dish merges into the rim, the wheel dish, wheel rim and brake disc carrier are all centred and joined together by means of a screw (16). USE/ADVANTAGE - Simplification of the design of a disc brake without detracting from its functionality.

Wear indicator for indicating the wear limit for disc-brake pads

Abstract: In a hole (6) in a brake shoe (1) for a disc brake there is fastened axially, in a manner such that it can be detached, a wear indicator (4) having a body (7), in which an insulated, electric loop (8) is situated, which wear indicator comes into contact with the brake disc when the wear limit has been reached and triggers a warning display. The wear indicator (4) is pretensioned axially against the pad back plate (2), for example by a snap ring (11), which is supported on a bevel (14) in the hole (6), in order to be able to indicate with a very low tolerance that the wear limit has been reached.

Spring for a disc-brake

Abstract: A disc brake comprises a caliper mounted slideably relative to the axis of the rotating disc, on a fixed support by way of an axial column, two friction members mounted on carrier plates anchored and axially slideable inside an opening in the fixed support so as to come into frictional engagement with the opposing sides of the disc when a brake motor is operated, and a locking element extending axially between at least one opening formed in the caliper and at least one opening formed in the fixed support so as to help guide the caliper on the fixed support and prevent it pivoting about the column when it assumes its normal operating position. A spring is mounted on the caliper on the side located circumferentially at a distance from the axial column, the mounting portion being elastically mounted inside at least one opening provided in the caliper for the locking element to pass through, the mounting portion surrounding substantially the part of the locking element passing through said opening, the rigid working portion being capable of biasing elastically the friction-member carrier plates substantially radially towards the axis of the disc.

Internally ventilated disc brake

Abstract: An internally ventilated disc brake consisting of two friction rings which are arranged spaced apart by means of connection ribs. A plurality of approximately radial cooling air channels are formed between the ribs. Arranged in the channel, held spaced apart, are air deflection elements of great heat-absorption capacity. In particular, the deflection elements run approximately parallel to the ribs and are arranged between the two friction rings transversely to the direction of rotation of the brake disc. The deflection elements consist of guiding lamellae in a bearing plate, said guiding lamellae being set at an angle and arranged one after the other. Air passage apertures are formed between the plate and the lamellae set out of the plane of the bearing plate.

Disk brake of a pin type

Abstract: A disc brake of a guide pin type which comprises a boss member provided on one of a caliper of the disc brake and a support member fixed to a stationary portion of a vehicle, a guide pin slidably mounted in the boss member, the guide pin being fixed to the other one of the caliper and the support member, and a boot for damping and sealing the boss member The boot is disposed between the boss member and the guide pin, the boot is formed of an elastic material, the boot is provided at one end thereof with a thickened portion and a seal portion The thickened portion has an outer diameter substantially equal to an inner diameter of one end of the boss member, and the thickened portion being press-fitted in between the boss member and the guide pin The seal portion is substantially tubular, the seal portion is formed integral with the boot, the seal portion is disposed radially outwardly of the thickened portion in surrounding relation to the thickened portion, and the seal portion is fitted on the outer surface of the boss member