105results about "Fluid actuated drum brakes" patented technology

A hydrostatic rotary machine includes (i) an inner element and an outer element which are coaxial and mounted with the ability to rotate one with respect to the other about an axis of rotation, one of these elements being a rotor and the other of these elements being a stator, (ii) a brake counter-disc which is mounted on the distribution hub, which extends radially around the distribution hub, and which is rotationally coupled to the outer element, (iii) a passive-braking piston designed to activate a brake under the effect of an elastic element and which is mounted with axial mobility with respect to the brake counter-disc, and (iv) a hydraulic brake-release chamber positioned between the brake counter-disc and the passive-braking piston.

Brake systems, vehicles having such brake systems, and methods of operating and installing the brake systems on vehicles. Such a brake system operates one or more brakes to reduce the speed of the vehicle through the operation of a brake pedal. The system includes a hydraulic circuit functionally coupled to the one or more brakes and configured to apply a braking force with the brake(s) that is in relation to a change in pressure of hydraulic fluid within the hydraulic circuit, and an air circuit functionally coupling the brake pedal to the hydraulic circuit. The air circuit is configured to convert manual actuation of the brake pedal to a change in the pressure of the hydraulic fluid within the hydraulic circuit and thereby apply a braking force in relation to a degree of actuation of the brake pedal.

The invention comprises a braking device for installation in the intermediate space (ZR) between the wheels of a twin axle of a track-guided vehicle. The braking device (BV) consists of two sub-units that are movable relative to one another, namely a first sub-unit (TE1) with brake pads (BRB) for the wheels of the first axle of the twin axle and a second sub-unit (TE2) with brake pads (BRB) for the wheels of the second axle of the twin axle. In the installed state, the sub-units are displaceably mounted such that displacement of the sub-units creates contact between the brake pads (BRB) and the wheels. At least one distance sensor (ABS) is arranged in one of the sub-units of the braking device (BV). The distance sensor (ABS) is configured to measure a distance between the first sub-unit (TE1) and the second sub-unit (TE2).Furthermore, a track-guided vehicle with a twin axle, a distance sensor, a method for operating a braking device and a computer program are included.

In order to solve the problems of output port rotation after the power take-off is disengaged and the oil chamber sharing and sequence of the friction gear-engaging structure and the brake locking structure, the present invention provides a friction power take-off with a built-in brake structure, comprising a housing, an output end cover, an output shaft, an output gear sequentially sleeved on the output shaft from the inside to the outside, a gear-engaging piston, a brake piston and a brake locking assembly, a clutch friction plate group is also arranged between the output gear and the output shaft, the brake locking assembly comprises a first brake shoe for abutting against the inner wall of the output end cover, a closed cavity is arranged between the gear-engaging piston and the brake piston, the gear-engaging piston drives the clutch friction plate group to fix and separate the output gear and the output shaft, drives the brake piston to drive the brake locking assembly to lock and separate with the output end cover, thereby realizing the disengagement and engagement of the power take-off during vehicle driving, and the brake locking device avoids the rotation of the output port and the influence on the rear connection mechanism after the power take-off is disengaged.

A brake lining (3, 130, 230) for a radially actuatable drum brake (1) of a utility vehicle has a lining support (32, 132, 232), at least one friction lining (31, 131, 231), said friction lining being provided on the lining support (32, 132, 232) and having a friction surface which is convex in the shape of a circular arc segment in the circumferential direction, and a pressure piece (7, 170, 270) which is secured to the lining support (32, 132, 232), said pressure piece (7, 170, 270) being positively and / or frictionally held in the radial direction with the aid of at least one holding element. The invention also relates to a drum brake.

The utility model discloses a clearance self-adjusting drum-type forklift brake which comprises a brake drum, a brake shoe is installed at the front end of the brake drum, a brake wheel cylinder is installed at the upper position of the front end of the brake shoe, a sleeve is connected to the outer wall of a return spring in a sleeved mode, and the outer wall of the return spring is sleeved with a brake wheel cylinder. According to the device, a sleeve is connected to the outer wall of a return spring in a sleeving mode, when the return spring is stretched, the sleeve can rotate with a gear shaft rod as a circle center shaft, the gear shaft rod rotates in a gear groove, the gear shaft rod can rotate in the gear groove, and therefore the brake shoe can rotate in the gear groove; and meanwhile, the stretching of the return spring enables the upper supporting seat to generate displacement, the upper supporting seat moves along the connecting column, and the movement of the connecting column enables the pushing plate to extrude the stainless steel spring, so that the displacement amplitude of the return spring can be limited when the brake shoe is subjected to applied force, and the phenomenon that the return spring falls off is prevented.

A gearbox assembly including a gear assembly, an input shaft, an output shaft, and a gear brake system. The input shaft is coupled to the gear assembly. The output shaft is drivingly coupled to the input shaft through the gear assembly. The gear brake system is disposed within the gear assembly, and includes one or more brake devices. The gear brake system actuates the one or more brake devices to brake the gear assembly during a reverse torque condition of the gearbox assembly.

The application relates to the field of automobile braking technology, and particularly discloses a tension spring used in an automobile braking system, which comprises a tension spring, fixed columns arranged at the two ends of the tension spring, hooks arranged at the two ends of the tension spring and hung on the two fixed columns, the tension spring is installed in a brake drum, two brake shoes are further installed in the brake drum, mounting plates are connected to the brake shoes, connecting plates are arranged at the ends of the two mounting plates which are close to each other, rotating rings are rotatably installed on the connecting plates and sleeved on the spiral part of the tension spring. When the end of the tension spring is broken, the mounting plate can stretch the tension spring through the second telescopic rod, the connecting plate, the first pull ring, the second pull ring, the rotating seat, the prism and the rotating ring, the rotating ring is clamped on the tension spring in the reverse direction, the rotating ring is prevented from being separated from the tension spring, the driver can continue to brake, the driver can continue to brake after the end of the tension spring is broken, the driver can continue to drive to a repair shop for repair, and the situation that the automobile cannot be driven after the tension spring is broken is avoided.

The invention relates to a vehicle drum brake (1), in particular for commercial vehicles, comprising a brake carrier (5), a drum (3) rotatable relative to the brake carrier (5) about a drum axis (X) with a circumferentially formed inner friction surface (21), wherein the brake carrier (5) and the drum (3) define a drum housing (14), a brake lining assembly (7) with several radially movable lining carriers (11), on each of which a brake lining segment (9) is provided facing the friction surface (21), wherein the drum (3) and the brake lining assembly (7) are arranged on a first side (2) on the brake carrier (5), and the drum brake (1) has a service brake device (32) and a parking brake device (29) for actuating the brake lining assembly (7).It is proposed that the drum brake (1) is characterized in that the drum brake (1) has an actuator (23) with an actuator housing (22) which is arranged on the brake carrier (5) on a second side (8) opposite the first side (2), wherein the actuator housing (22) has the parking brake device (29).

The present invention relates drum brake system, comprising a back plate assembly and a brake drum (1) that is rotatable with respect to the back plate assembly, the back plate assembly comprising: a back plate (2); two brake shoes (3, 3′), the two brake shoes (3, 3′) being pivotably connected to the back plate (2), pivot axes (4, 4′) of the brake shoes (3, 3′) being disposed at or near first ends of the brake shoes (3, 3′); an actuator housing (5) with two pistons (6, 6′), the two pistons (6, 6′) being configured to move outwardly, to press each piston (6, 6′) against one of the brake shoes (3, 3′) to pivot the respective brake shoe (3, 3′) outwardly about its pivot axis (4, 4′), and to press the respective brake shoe (3, 3′) against the brake drum (1) for braking; a return spring (7) extending between the brake shoes (3, 3′) and being connected to both brake shoes (3, 3′), the return spring (7) being configured (7) to exert a retracting spring force that pulls both brake shoes (3, 3′) away from the brake drum; two tension springs (8, 8′) and a holder arrangement (9), inner ends of each of the two tension springs (8, 8′) being connected to the holder arrangement (9), an outer end of the first tension spring (8) of the two tension springs (8, 8′) being connected to a first brake shoe (3) of the two brake shoes (3, 3′) and an outer end of the second tension spring (8′) of the two tension springs (8, 8′) being connected to a second brake shoe (3′) of the two brake shoes (3, 3′).

The present invention relates to the technical field of drum brakes, and specifically to a method for designing a drum brake that has both temperature regulation and pressure compensation. By designing a brake shoe system consisting of a NiTi alloy compensation pin, a brake shoe, and a NiTi alloy friction lining, and utilizing the characteristics of the material's martensitic phase transformation, heat absorption and heat release, and volume contraction and expansion, the heat generation and heat dissipation properties of the drum brake are improved. Based on experimental data and related calculation formulas, the structure of the brake shoe system is improved to achieve alternating pressure between the friction plate and the brake drum, thereby improving steering control performance and reducing the possibility of safety accidents caused by failure of heavy machinery brakes. The present invention has a reasonable design, can reduce brake failure caused by high temperature due to brake friction and control failure caused by emergency braking, and has great practical application value.

A drum brake assembly that includes a brake drum, first and second brake shoes, a cam shaft, a first tappet, a second tappet, and a wear adjuster mechanism. The wear adjuster mechanism has a cross shaft and a sensor. The sensor is configured to detect rotation of the cross shaft about a longitudinal axis to monitor wear of the first and second brake shoes and a braking surface of the brake drum.

The utility model discloses a kind of stability promotion's automobile drum brake pad, including bottom plate, the outer circular surface of the bottom plate is rotatably installed with brake drum, the inner side surface of the brake drum is equipped with long recess, the middle position of one side of the bottom plate is fixedly connected with fixed block, the one side of the fixed block is fixedly connected with connecting rod, one end of the connecting rod is fixedly connected with support rod, the both ends of the support rod are hinged with arc plate by hinging seat, the one side surface of the arc plate is fixedly connected with fixed ring, the one side of the fixed ring is fixedly connected with tension spring, the other side surface of the arc plate is equipped with fixed groove, brake pad is fixedly installed in the inside of the fixed groove, the inside of the brake pad is fixedly embedded with framework plate, the one side surface of the framework plate is fixedly connected with long protrusion, can increase structural strength, can enhance braking effect after surface wear, improve safety stability, facilitate combined use.

The utility model provides a hydraulically actuated single-cylinder brake, which comprises a brake shoe assembly, a brake bottom plate assembly, an expander assembly and a single-cavity brake cylinder which are connected in sequence, the expander assembly comprises an expander, an adjusting screw rod of the expander is connected with a web plate of the brake shoe assembly, the single-cavity brake cylinder comprises a single-cavity cylinder body, and the single-cavity cylinder body is connected with the brake bottom plate assembly. A single-cavity piston moving in the axial direction of the single-cavity cylinder body is arranged in the single-cavity cylinder body, a guide ring and a sealing ring are arranged on the circumferential side of the single-cavity piston at intervals, an exhaust hole and an oil inlet are formed in the bottom of the single-cavity cylinder body, and an exhaust nozzle is arranged in the exhaust hole. The defects that in the prior art, an air pressure brake cannot meet the requirement for long-time service braking, and meanwhile the dragging and abrasion risk of the brake exists can be overcome.

Hydrostatic rotary machine comprising: - an internal element (1) and an external element (2) which are coaxial and mounted to rotate relative to one another about an axis of rotation (R), one of these elements being a rotor and the other of these elements being a stator; - a counter-brake disc (31) mounted on a distribution base (4), extending radially around the distribution base (4) and rotationally coupled to the external element (2); - a passive brake piston (36) designed to activate a brake (21) under the action of an elastic element (43) and mounted to be axially movable with respect to the counter-brake disc (31); - a release hydraulic chamber (50) arranged between the counter brake disc (31) and the passive brake piston (36).

The present invention discloses a safety drum brake device, which relates to the technical field of automobile brakes. The present invention comprises a chassis; a pair of brake shoes are symmetrically arranged on the inner end surface of the chassis; friction leathers are fixed to the opposite outer sides of the two brake shoes; a driving assembly is installed on the inner end surface of the chassis; the driving assembly is installed between the two brake shoes; the driving assembly comprises a pair of hydraulic cylinders fixed side by side on the inner end surface of the chassis; first movable blocks are fixed to the two output ends of the hydraulic cylinders; mounting plates are arranged on the opposite outer sides of the two hydraulic cylinders; the two mounting plates are respectively fixed to the opposite inner sides of the two brake shoes; the mounting plates are connected to the first movable blocks on the hydraulic cylinders through the first movable block and the mounting plate. The present invention drives the brake shoes equipped with friction leathers to approach and fit the brake drum through the hydraulic cylinder via the first movable block and the mounting plate, thereby achieving the purpose of safe braking, and has a high market application value.

The utility model relates to the technical field of brakes, and discloses an overheating clearance self-adjusting protection brake which comprises a brake drum, a brake shoe assembly is installed in the brake drum, the brake shoe assembly comprises a brake shoe body, the outer side face of the brake shoe body is fixedly connected with a brake pad, and the brake pad is fixedly connected with the brake drum. A cooling shell is fixedly connected to the inner side of the brake shoe body, cooling liquid is contained in the cooling shell, and an adaptive groove and heat dissipation holes are formed in the brake shoe body. According to the brake shoe assembly, the brake shoe can be cooled through the cooling shell, the temperature rise time of the brake shoe is greatly prolonged, the brake shoe is prevented from being in a high-temperature state for a long time, and the service life of the brake shoe is prolonged.

A radially actuated drum brake (1) for a commercial vehicle comprises a brake drum (2) rotatably mounted about an axis of rotation (AR), an anchor housing (5) with bearing receptacles (51) for brake linings (3), at least two brake linings (3) mounted in a receiving space of the brake drum (2) in respective bearing receptacles (52) of the anchor housing (5), each of the brake linings (3) having a friction lining carrier (32), a friction lining (31) arranged thereon and a pressure piece (7) arranged on an underside of the lining carrier (32) facing away from the friction lining, which projects radially in the direction of the axis of rotation (AR) of the brake drum (2) through an opening (54) of the respective bearing receptacle (52) of the anchor housing (5), a clamping device (4) arranged on a cylindrical sleeve (51) of the anchor housing (5) with at least one pressure element,with which the brake linings (3) can be pressed against an inner surface of the brake drum (2) in a clamping direction (r) radially to the axis of rotation (AR) of the brake drum (2), wherein at least one return spring is provided in the receiving space of the brake drum (2) on each of the brake linings (3), the return spring bearing against a lower surface (53) of the bearing receptacle (52) of the armature housing (5) facing away from the brake lining (3), with which the respective brake lining (3) can be moved from a braking position in contact with the inner surface (21) of the brake drum (2) to a non-braking position away from the inner surface (21) of the brake drum (2).

The invention relates to a segmented brake shoe 5, 6, which is composed of at least four sections, for a motor vehicle drum brake 1, comprising at least two friction material segments 15-15''''; 16-16'''' fixed at a distance from each other, which are attached to a curved T-roof 19 made of sheet steel, having a T-shaped profile in cross-section, wherein the segmented curved friction material segments 15-15''''; 16-16'''' on the T-roof 19 for friction cooperation with a curved friction surface of a brake drum, and with a T-bridge 20 arranged essentially orthogonally and centrally to it, which is essentially planar, centrally and orthogonally directed in relation to the T-roof 19, wherein at least one primary brake shoe of the drum brake 1 has at least one feature or means to enable a linearization of the constructively non-linear defined brake characteristic C* of the drum brake 1.

The utility model relates to the technical field of vehicle brakes, in particular to a brake shoe assembly for an electro-tricycle, which comprises a chassis and a brake drum, a double-end cylinder is fixedly arranged on the chassis, two brake shoes are slidably connected onto the chassis, friction plates are respectively arranged on the outer sides of the two brake shoes, and the brake drum is arranged on the chassis. The two brake shoes are symmetrically distributed on the two sides of the double-end air cylinder. Comprising two transmission assemblies, the double-end air cylinder drives brake shoes on the corresponding sides to slide through the transmission assemblies, each transmission assembly comprises a connecting frame connected to the corresponding brake shoe, the connecting frames are connected to a chassis in a sliding mode, and the connecting frames are arranged on the sides, close to each other, of the two brake shoes. A rotating part is movably connected to the output end of the double-end air cylinder and is in transmission connection with the connecting frame. A reset assembly is further arranged between the two brake shoes. The two brake shoes are driven to move towards the inner wall of the brake drum, and the problem of local excessive abrasion of the friction plates is solved.

The invention discloses a vehicle brake control device which comprises a drum wheel rack, a leading shoe, a trailing shoe and a cam, one end of the leading shoe and one end of the trailing shoe are provided with a first roller and a second roller matched with the cam respectively, the other end of the leading shoe and the other end of the trailing shoe are matched with a pivoting piece to enable the leading shoe and the trailing shoe to swing in a fixed-axis mode, and the cam rotates to push the first roller and the second roller to move outwards during braking. The driving wheel drives the leading shoe and the trailing shoe to swing and expand outwards, so that the leading shoe and the trailing shoe rub with the drum wheel rack to realize braking; the outer contour line of the cam comprises an asymmetric S-shaped curve which enables the moving distance of the first roller and the second roller to be equal or the rotating angle of the leading shoe and the rotating angle of the trailing shoe to be equal in the swinging process of the leading shoe and the trailing shoe. The outward rotating angles (or displacements) of the leading shoe and the trailing shoe on the two sides can be equal in the swinging process of the leading shoe and the trailing shoe, so that the friction lining can achieve the best friction effect, the brake pad can be opened more powerfully, and the brake pad is lighter and more sensitive to use.

A drum brake is provided which has a brake shoe holding mechanism that improves the tracking capability with respect to the movement of a brake shoe. A shoe holding pin of the brake shoe holding mechanism provided in the drum brake comprises a base section engaging with a back plate, a shaft section extending continuously from the base section, and a head section of the distal end extending continuously from an axial end section of the shaft section. The head section of the distal end engages a locking section provided in a shoe holding area. A projecting section (contact section) against which the locking section rests is provided at a position spaced from the head section of the distal end in the direction of the shaft section.The brake shoe holding mechanism makes it possible to improve the tracking capability with regard to the movement of the first and second brake shoes.

A drum brake (1) for a commercial vehicle comprises a brake drum (2) rotatably mounted about an axis of rotation (AR), at least two brake shoes (3) mounted in a receiving space of the brake drum (2), an armature housing (7) with a clamping device (4) arranged thereon in a rotationally fixed manner and with a wedge ring (41) displaceable on a cylinder sleeve (71) of the armature housing (7) parallel to the axis of rotation (AR) of the brake drum (2), with which the brake shoes (3) can be pressed against an inner surface of the brake drum (2) radially to the axis of rotation (AR) of the brake drum (2), a brake cylinder assembly (6) arranged in the receiving space of the brake drum (2) on the armature housing (7) in a rotationally fixed manner for actuating the wedge ring (41), with a brake cylinder housing (61) attached to the armature housing (7) in which a service brake unit and a parking brake unit are arranged,wherein the parking brake unit comprises a parking brake piston (63) movable in a parking brake pressure chamber (67) and a spring element (66) which, when the parking brake pressure chamber (67) is filled with compressed air, is held in a release position by the parking brake piston (63) against a spring force of the spring element (66) and, when the parking brake pressure chamber (67) is vented, pushes the parking brake piston (63) from a non-braking position to a braking position, wherein at least one emergency release device (5) is arranged on the armature housing (7) with which the spring element (66) can be held in the release position even when the parking brake pressure chamber (67) is vented.

The utility model provides a high-strength wear-resistant gray cast iron brake drum which comprises a brake bottom plate fixed with an axle, two brake shoes which are oppositely arranged are hinged on the brake bottom plate, a brake drum which is braked through friction of the two brake shoes is rotatably arranged on the brake bottom plate, and a spray assembly is arranged in the brake bottom plate. The spraying assembly comprises an annular water pipe coaxial with the brake bottom plate, the annular water pipe is located between the two brake shoes, a plurality of spray nozzles are arranged on the annular water pipe at equal intervals, a water inlet pipe is installed at the water inlet end of the annular water pipe, the other end of the water inlet pipe penetrates through the back of the brake bottom plate and then is communicated into a water tank on the vehicle, and water outlets are formed in the brake shoes. The spraying assembly is arranged on the brake bottom plate, the spraying assembly is started to spray mist, water mist is dispersed in the brake drum and makes contact with the surface of the brake drum, the brake drum is cooled, air continuously enters the water outlet to accelerate air flowing, the cooling effect is improved, and meanwhile the water mist is heated, evaporated and collected into water drops to be discharged in time through the water outlet.

Hydrostatic rotation machine comprising: – an internal element (1) and an external element (2) coaxial and mounted to rotate relative to each other about an axis of rotation (R), one of these elements being a rotor and the other of these elements being a stator; – a counter-brake disc (31) which is mounted on a distribution base (4), which extends radially around the distribution base (4), and which is coupled in rotation with the external element (2); – a passive braking piston (36) adapted to activate a brake (21) under the effect of an elastic element (43), and mounted axially movable relative to the counter-brake disc (31); – a hydraulic release chamber (50) arranged between the counter-brake disc (31) and the passive braking piston (36). Figure for the abstract: Fig.1

The utility model belongs to the technical field of brakes, and discloses a two-way braking type walking brake which comprises a brake body, detection structures are arranged on the two sides of the interior of the brake body, pressure sensors are arranged in the detection structures, and installation rings located on the outer sides of the detection structures are arranged on the inner wall of the brake body. The detection structure comprises a mounting frame, and a movable block is arranged in an inner cavity of the mounting frame. According to the brake, the balls and the pressing rods are arranged, when the brake is used, the shoe blocks drive the mounting frame to move towards the outer side, then the balls are driven to extrude the mounting ring, the balls, the connecting columns and the movable blocks are blocked to move towards the inner cavity of the mounting frame, meanwhile, the movable blocks drive the pressing rods to move, and when the pressing rods trigger the pressure sensors, personnel are reminded to replace the shoe blocks; and when not triggered, the brake is normally used, so that potential safety hazards are avoided by detecting the abrasion condition of the friction plate, and the friction plate is replaced in time.

The invention relates to a drum brake (2) for a motorized road vehicle wheel. The drum brake (2) is configured to brake the wheel in dual servo mode during parking braking and service braking of the vehicle. The brake (2) comprises a first actuator support (30) which is configured to mechanically connect a first actuator (5) to a plate (20) of the brake. The first actuator support (30) comprises a first force-recovery wall (31) and a second force-recovery wall (32). The first force-recovery wall (31) is configured to transmit to the plate (20) a thrust force exerted by the first segment (21) during braking. The second wall is configured to transmit to the plate (20) a thrust force exerted by the second segment (23) during braking. (figure 3)

A spring brake actuator for braking a vehicle wheel. The spring brake actuator comprises an axially elongated housing having a parking brake chamber and a service brake chamber. The parking brake chamber houses a main compression spring, a flexible diaphragm, and a pressure plate axially positioned between the main compression spring and the flexible diaphragm. The flexible diaphragm has a shaped profile that inhibits radial movement of the pressure plate relative to the flexible diaphragm.