2329 results about "Brake shoe" patented technology

An exerciser includes a flywheel rotatably attached onto a frame and coupled to a pair of foot pedals with a transmission device, an arch having one end rotatably coupled to the frame, one or more magnetic members attached to the arch and moveable toward or away from the flywheel, to adjust the magnetic retarding force to the flywheel. A brake shoe is attached to the other end of the arch, and movable to engage with and to brake the flywheel. A spring may bias the arch and the brake shoe away from the flywheel, to allow the brake shoe to be moved toward and against the flywheel and to brake the flywheel selectively. An actuating device may force the brake shoe of the arch to engage with and to brake the flywheel.

A system for determining brake shoe effectiveness of a braking arrangement of a train during operation of the train including at least one brake database including braking data and at least one train database including train data. A control system is in communication with the at least one brake database and the at least one train database, and the control system dynamically determines brake shoe effectiveness data based upon the braking data and the train data, where the brake shoe effectiveness data includes the ability of the braking arrangement to retard the train to a specified level.

A progressive safety device for an elevator includes a brake unit and an actuating unit. The brake unit has a first brake shoe with first spring assemblies and a triangular rotatable support with second and third brake shoes. The actuating unit has an electromagnetic actuator with a locking bolt, a guide bolt with a coaxial compression spring and an actuating arm. On actuation, the compression spring moves the actuating arm against a guide rail whereby grooves on the actuating arm create a frictional engagement with the guide rail turning the actuating arm about a swivel bearing and through a follower turning the support. With the turning motion and the engagement of one of the second and third brake shoes with the guide rail, the first brake shoe is guided against the guide rail and generates the necessary braking force on the guide rail.

A composition brake shoe for use on a railway vehicle for reconditioning a wheel tread surface during a normal braking application on such railway vehicle is provided. The composition brake shoe includes a backing plate having a stirrup and a brake surface having a predetermined configuration and a predetermined surface area. It further includes a first friction type composition material extending over the surface area of such brake surface of such composition brake shoe. The composition brake shoe further contains a second friction type material, formed as at least one discrete insert, having a predetermined shape and molded into such first friction type composition material. Such second friction type material initially being completely embedded within such first friction type composition material. One surface of such at least one discrete insert being incrementally exposed as such first friction type composition material is eroded away due to frictional engagement with such wheel tread surface during normal braking operations, such second friction type material exhibiting greater abrasive properties than such first friction type composition material. Such at least one discrete insert of such second friction type material is bonded to such backing plate.

Disclosed herein is an electronic parking brake which is installed in a vehicle and is operated by a motor. The electronic parking brake having a drum rotating together with a wheel and first and second brake shoes includes a motor rotated in normal and reverse directions and generating driving force for braking, a cycloid reducer connected to a rotary shaft of the motor and amplifying the driving force generated from the motor, a spindle member connected to the cycloid reducer and rotated, a spur gear assembly rotated by rotary force transmitted from the spindle member, a piston rotated and provided with the outer circumferential surface on which one gear of the spur gear assembly is integrally formed, and a push rod unit installed at both ends of the piston in the longitudinal direction, rectilinearly moved according to rotation of the piston and supported by the first and second brake shoes.

A parking brake having an actuator, wherein the actuator is driven with a direct current motor which can be operated in two directions and which moves a piston of the actuator and, via a self-locking gear mechanism of the actuator, at least one brake shoe for applying or releasing the parking brake. A control unit for performing open-loop or closed-loop control of the movement of the direct current motor is also provided. During open-loop or closed-loop control of the movement of the direct current motor for applying and/or releasing the parking brake, the control unit takes into account a hydraulic admission pressure which is currently present at the piston if the brake is applied or was present at the piston if the brake has been released when it had previously been applied. A corresponding method for operating such a parking brake is also disclosed.

The invention discloses a high friction composite brake shoe for a railway wagon and a manufacturing method thereof. The composite brake shoe comprises: a steel back and a brake shoe body which is fixed on the steel back, wherein, the brake shoe body is prepared by materials which are synthesized by various components with the following weight ratio: 8 to13 parts of nitrile butadiene rubber, 2 to10 parts of styrene butasiene rubber, 5 to10 parts of cresol modified A-stage phenolic resin, 15 to 30 parts of steel fiber, 10 to 15 parts of magnesium oxide, 5 to 10 parts of calcined petroleum coke, 2 to 5 parts of silicon carbide, 10 to25 parts of mineral fiber, 5 to 10 parts of calcium hydride, 10 to 20 parts of barium sulfate, 5 to 10 parts of graphite, 1 to 5 parts of molybdenum disulfide, 1 to 5 parts of carbon black, 1 to 3 parts of sulfur and 1 to 3 parts of enhancer. The brake shoe can be used in the railway heavy-duty high-speed wagon and has stable friction performance and better wear resistance; the brake shoe can effectively inhibit the phenomena of metal inlay, cracks, dropping blocks and the like and reduce the damages on wheels; and the brake shoe is characterized by better impact resistance performance and good weatherability.

The invention belongs to the technical field of materials, and particularly relates to a hybrid fiber reinforced friction material for train braking and a preparation method thereof. In the invention, a composite modified phenolic resin is used as an adhesive, and hybrid fibers, including carbon fiber, metal fiber, inorganic mineral fiber and the like, are used as the reinforcing fibers. Compared with the prior art, the invention improves the contour machining property of the organic synthetic brake, and the yield of the material is high; the brake has stable frictional property at different braking speeds, does not has obvious degradation of frictional property at high speed, and does not have the phenomena of shedding and cracking on the working surface after the braking test. The friction material provided by the invention can be widely used for manufacturing brake pads, brakes, brake shoes and the like in braking systems of passenger and freight trains, municipal rail transportation, subways and the like.

The invention provides an elevator rolling guide shoe with a brake function. The elevator rolling guide shoe is provided with a rolling guide wheel mechanism, hydraulic execution mechanisms and stop mechanisms, wherein three guide wheels of the rolling guide wheel mechanism cling to three working surfaces of a T-shaped guide rail and are used for limiting the horizontal movement of an elevator car; the hydraulic execution mechanisms are connected with the guide wheels of the guide shoe and used for determining whether pressures are applied to the guide wheels according to a detected elevator running state; and the stop mechanisms are integrated in the guide wheels and used for stopping the guide wheels when an elevator is in a post stall state and enabling the guide wheels to tightly hold the guide rail in combination with pressing forces provided by the hydraulic execution mechanisms, so that the emergency braking is achieved; and each stop mechanism is composed of the following parts: a guide shoe base, a long connecting rod, a main swing rod, a secondary swing rod, a brake bottom plate, a hydraulic wheel cylinder, a brake shoe, a brake pad and a brake drum covered by wear-resistant rubber.

Provided is a vehicle speed control device with respect to which the speed at which a centrifugal brake operates can be easily changed from the outside without disassembling the device. A brake drum 11 is fixed to a vehicle body 101a. A brake shoe 23 rotates around a rotary shaft 20 of the wheel 101c, and reduces the rotation speed of the wheel 101c as a result of coming into contact with an inner circumferential side face of the brake drum 11. A spring 24 prevents contact between the brake drum 11 and the brake shoe 23 when the rotation speed of the wheel 101c is lower than or equal to a predetermined speed, and permits contact between the brake drum 11 and the brake shoe 23 when the rotation speed of the wheel 101c exceeds the predetermined speed. A position change mechanism 25 is installed within the brake drum 11, and changes the position of an end of the spring 24 on one end side. A transmission mechanism 26 transmits a force that is input by an external operation to the position change mechanism 25 and drives the position change mechanism.

A brake disc for a wheel constituted by a peripheral section, forming a brake band with an interior form enabling it to be fitted to its wheel, the brake band forms two lateral flat and parallel surfaces on which a brake shoe can act, said peripheral section having a series of off-sets on its inside and outside edges.

An emergency braking system for a machine tool for abruptly braking a revolving shaft includes at least one brake drum and at least one brake shoe which are engaged with one another in order to brake the shaft. The braking intervention between the brake drum and the brake shoe takes place under the influence of a centrifugal force resulting from the rotation of a shaft as soon as a locking device is released. Also provided in the braking system is a diagnostic system which allows the functionality of the locking device to be checked.

The invention discloses a friction material for a brake-shoe of a heavy axle-load wagon. The friction material is prepared from the following components in percentage by mass: 6-12 percent of nitrile rubber, 1-4 percent of butadiene styrene rubber, 3-8 percent of A-stage phenolic resin, 0.4-1 percent of insoluble sulfur, 0.1-0.6 percent of an accelerant, 0.1-0.6 part of a curing agent, 2-6 percent of carbon black, 8-18 percent of barite, 1-4 percent of kyanite, 17-40 percent of hybrid fibers, 7-14 percent of magnesium oxide, 2-6 percent of petroleum coke, 2-8 percent of calcium sulfate crystal whiskers, 1-4 percent of molybdenum disulfide, 1-5 percent of crystalline flake graphite, 1-4 percent of artificial graphite, 1-4 percent of mica iron oxide and 1-3 percent of antimony sulfide. The friction material can satisfy the friction performance and mechanical property required by the brake-shoe of the heavy axle-load wagon and can meet the high speed operating requirement on heavy load of the wagon.

Disclosed is an apparatus for preventing backlash of a spool used in a baitcasting reel, in which the number of brake shoes can be optionally adjusted. The position of the shoe is selected between protruded guides of a shoe holder so as to apply braking force, so that the backlash of the spool is precisely controlled, without decreasing the carry distance of casting.

The invention discloses a pair of novel progressive safety tongs, which comprises a tongs body, wherein the inside of the tongs body is provided with a movable wedge; and a movable wedge pushing mechanism is arranged inside the tongs body under the movable wedge. The pushing mechanism comprises a fixed seat, two lever arms, a spring and an electromagnet, wherein the fixed seat can move up and down in the tongs body; the two lever arms are hinged on both sides of the fixed seat through a pin shaft respectively; a brake shoe is arranged on the inner surface of the front end of each lever arm, and a cushion block is arranged on the upper surface of the front end of the each lever arm; the spring is arranged between lever bodies of the two lever arms; the electromagnet is arranged on the rear end part of the two lever arms; and the switching of a circuit of the electromagnet is controlled by an elevator speed monitoring device. The invention adopts the pushing mechanism to drive the movable wedge of the progressive safety tongs to complete the elevator braking function by the structure, does not need to arrange a safety pulling device, simplifies the structure of a speed limiter, has the advantages of compact structure and convenient assembly, and is suitable to be arranged on various elevators.

The invention relates to a powder metallurgy iron-base high-speed brake lining, composed of a brake shoe back (1), a dovetail block (2), a friction block (3) and a serging vessel (4) linked with a rivet (6) through a rivet seat (5), wherein, the friction block (3) adopts a vessel serging structure and powder metallurgy iron-base friction materials and is formed by chill pressing and compression sintering. The invention is characterized by reliable structure, stable drag friction performance, low surface temperature rise, small relative dispersion and good wearing resistance, etc., and is suited to starting or towing a car on a railway with speed at or below 300km/h.

The invention relates to a composition brake shoe for an urban rail vehicle and a manufacturing method of the composition brake shoe for the urban rail vehicle. The composition brake shoe comprises the following components of, by weight, 10-15 parts of butadiene-acrylonitrile rubber, 10-20 parts of cashew nut shell oil modified phenolic resin, 6-10 parts of basalt fibers, 4-8 parts of carbon fibers, 8-15 parts of steel fibers, 5-8 parts of sepiolite fibers, 2-6 parts of hexamethylenetetramine, 5-8 parts of iron oxide powder, 5-7 parts of crystalline flake graphite, 5-7 parts of chromite, 6-9 parts of barium sulfate, 3-6 parts of potassium feldspar and 5-8 parts of frictional powder. The manufacturing method of the composition brake shoe is a dry method production technology, and comprises the steps of steel back production, abrasive blasting processing, shaping, burdening, mixing, hot compacting, heat processing, subsequent processing, finished product forming and inspection. The manufactured composition brake shoe is inspected through the 1:1 rack test, is excellent in friction and abrasion resisting performance, stable in brake performance, safe and environmentally friendly, and solves the problem that the friction coefficient drops too fast under the conditions of damascene of the composition brake shoe for the urban rail vehicle, hot cracks, hot spots and rain and snow weather.