554 results about "Drum brake" patented technology

Disclosed is a wheel cylinder and a drum brake having the same, in which the number of position as well as other elements accompanied with the piston may be reduced, resulting in reduced manufacturing cost.

The invention relates to an electromechanical drum brake (18) for a motor vehicle. The electromechanical drum brake (18) comprises a drum (10) in which brake shoes (22) are arranged, and an adjusting device (14) arranged between the brake shoes (22) and driven by a drive unit (46), by means of which the brake shoes (22) can be spread apart for braking. The drive unit (46) with the adjusting device (14) is attached to the drum (10) by means of fastening means (50) such that the drive unit (46) with the adjusting device (14) is movable relative to the drum (10) in a drum plane.

The invention relates to an electromechanical drum brake (10) for a motor vehicle. The electromechanical drum brake (10) comprises brake shoes (14) and an adjusting device (18) arranged between the brake shoes (14) and driven by a drive unit (38), by means of which the brake shoes (14) can be spread apart for braking. The adjusting device (18) is attached to a rear wall (22) of the drum brake (10), the rear wall (22) being designed to be elastic such that it permits movements at least to the extent of the expected out-of-roundness and eccentricity.

The invention discloses a heat dissipation drum brake dynamic control system and method based on reinforcement learning. The method comprises the following steps that S1, drum brake operation data are collected and preprocessed; s2, training by using a gating circulation unit neural network, and outputting temperature rise trend data; s3, training based on a near-end strategy optimization algorithm to obtain a control strategy network, and outputting a heat dissipation control strategy; s4, performing joint optimization on hyper-parameters of the thermal state prediction model and the control strategy network by adopting a Harris eagle optimization algorithm; s5, generating a heat dissipation control instruction according to the optimized model, and controlling a heat dissipation execution mechanism to execute corresponding operation; and S6, continuously collecting temperature feedback data, comparing the temperature feedback data with the temperature rise trend data, and carrying out dynamic adjustment. Through fusion of reinforcement learning, deep prediction and intelligent optimization technologies, accurate prediction and dynamic heat dissipation control of the temperature rise trend of the drum brake are realized, so that the safety, the energy efficiency and the stability of a brake system are remarkably improved.

An apparatus for a brake drum having a drum brake assembly with first and second brake shoes includes a motor and a planetary gear train for receiving torque from the motor and having an output gear. A ball ramp assembly receives torque from the output gear and has ends aligned with the respective first and second brake shoes. The motor is actuatable for lengthening the ball ramp assembly to move the brake shoes and apply braking force to the brake drum. A bi-stable locking mechanism selectively locks the planetary gear train to apply a parking brake to the brake drum.

An energy-saving rolling support and radial symmetric hydraulic cylinder drum type intelligent braking structure of a screw press comprises a motor, the motor is fixed to an upper cross beam, an output shaft of the motor is connected with a gear, the gear is meshed with an outer ring gear on a flywheel, the flywheel and a first screw are connected and rotate together, and the top of the first screw is tensioned through a first nut; hydraulic cylinders are symmetrically arranged above the upper cross beam in the radial direction, hydraulic oil enters cavities of the hydraulic cylinders through oil conveying pipelines on the upper cross beam, advancing and retreating of piston push rods are achieved, drum brakes are installed on the front portions of the piston push rods, friction plates are symmetrically arranged on the end faces of the drum brakes, and when the piston push rods are ejected out, the friction plates make contact with the lower end faces of flywheels. Therefore, the braking of the screw rod mechanism is realized; according to the invention, the space is saved, and the braking sensitivity is improved; the friction loss of the screw press in the operation process is reduced, and the energy utilization rate is increased.

Provided is an electric drum brake system, including: an electric drum brake configured to be driven by an electric motor; a current sensor configured to detect a current input to the electric motor; and a controller configured to, when parking is released, determine a parking release time based on a temperature of the electric drum brake, and when a maintenance time reaches the determined parking release time, end a parking release operation by stopping the electric motor, the maintenance time being a period of time while a state where a motor current detected by the current sensor reaches a target current is maintained.

The invention provides an adjustable drum brake clearance measuring device, which comprises a device foundation, a brake assembly fixing structure, a brake drum fixing structure and a clearance measuring structure, and is characterized in that the device foundation is used as a fixed foundation structure of the whole clearance measuring device; a brake assembly fixing structure is fixedly arranged on the device foundation upwards, a brake assembly is fixedly installed in the horizontal direction through the brake assembly fixing structure, a brake drum fixing structure and the brake assembly fixing structure are coaxially arranged and arranged in a relative rotation mode, and a brake drum is fixedly installed on the brake drum fixing structure. The brake drum and the brake assembly form relative positions in a brake working state, and a detection part of the gap measuring structure is in contact with a brake lining of the brake assembly through a gap of the brake drum and obtains brake stroke data. The gap measuring device simulates the relative rotation state of the brake drum and the brake structure, data acquisition of gap change is realized, and the detection efficiency and precision are effectively improved.

The invention discloses automatic cutting equipment for a drum type brake shoe, and belongs to the technical field of automobile accessory manufacturing, the automatic cutting equipment for the drum type brake shoe comprises a machining table and a machining bin located at the top of the machining table, one side of the interior of the machining bin is provided with a moving seat mechanism, and the other side of the interior of the machining bin is provided with an adjusting mechanism; a storage mechanism is arranged in the moving seat mechanism, and a clamping mechanism used for fixing the brake shoe is arranged in the storage mechanism. The two rotating rings are arranged, the drum-type brake shoe in one rotating ring is automatically inserted into the other rotating ring through the moving seat mechanism, and the drum-type brake shoe is fixed through the clamping mechanism, so that the part, originally covered by the storage groove, of the outer side of the drum-type brake shoe can also be cut, and the machining efficiency is improved. And the position of the drum brake shoe in the storage groove does not need to be manually adjusted, so that the machining efficiency of the automatic cutting equipment for the drum brake shoe is improved.

An electromechanical drum brake comprises two brake segments intended to come into contact with a drum, and at least one actuator configured to apply the segments against the drum, and an electric motor configured to activate the actuator, the actuator comprising at least one member which is movable upon activation of the actuator, the movable member being movable between a braking position and a position beyond a release position, in which the segments are no longer in contact with the drum. The actuator comprises a stop which is arranged only in the actuator and against which the movable element bears when it assumes a position beyond the release position, and the motor powers the actuator until the movable element bears against the stop.

The invention relates to an ultrathin hub electric wheel with a speed reducer integrated in a low-speed drum brake, which comprises a cooling water channel, a motor, a drum brake, a planetary gear speed reducer, a hub, a hub bearing and an axle which are sequentially arranged from outside to inside in the radial direction and are positioned at the same axial position, the two ends of the cooling water channel are connected with an electric wheel outer shell and an electric wheel inner shell correspondingly, and the transmission path of driving force in the electric wheel is from the motor to the planetary gear reducer to the hub to the rim. Compared with the prior art, the axial space of the electric wheel assembly can be compressed to the maximum degree, layout of the speed reduction hub electric wheel assembly at the wheel end of a vehicle is facilitated, and the electric wheel assembly has the advantages of being highly integrated in space and compressed in the axial space limit.

The utility model relates to the technical field of electro-tricycle braking, in particular to a linkage braking assembly and an electro-tricycle. The linkage brake assembly comprises a linkage valve, the linkage valve comprises a valve body, a first elastic piece and a transmission structure, the valve body is provided with a first containing cavity used for containing hydraulic oil, and a plunger structure is connected into the first containing cavity in a sliding mode. According to the utility model, by treading the pedal plate, the pedal plate drives the plunger structure to move through the transmission structure, and hydraulic oil in the first chamber is extruded to finish pressure buildup from the first oil outlet pump to the oil path input port of the front disc brake; the hydraulic oil in the second cavity is extruded to complete pressure buildup from the second oil outlet pump to the oil way input port of the rear drum brake, due to the arrangement of the first sealing structure and the second sealing structure, the first cavity and the second cavity are not communicated with each other, even if pressure buildup of one oil way fails, operation of the other oil ways cannot be affected, and the service life of the rear drum brake is prolonged. And the safety is higher.

To provide high braking performance at a more affordable cost than hydraulic disc brakes by combining mechanical advantage and control cable technology.SOLUTION: The present invention relates to a cable actuated disc brake system (100) that is designed to address mismatching of the performance and cost between drum brakes and hydraulic disc brakes. Utilizing a floating caliper design, the system (100) allows engagement of one brake pad to trigger a caliper (101) to float and engage with the other pad. The system uses components such as a caliper (101), a caliper cap (102), a cam lever (103), an upper cam (104), a lower cam (105), a spherical rollers (106), an adjuster (107), a piston (108), a spring (109), multiple mounting bolts (110), and a dust cap (111), to combine mechanical advantage and control cable technology.SELECTED DRAWING: Figure 2

An actuator for a heavy vehicle foundation brake (e.g. disc or drum brake), and a brake assembly, vehicle and method including the actuator. The actuator includes: an (output) pushrod 30, 230a to inte

The present invention relates to a method for controlling the braking device (2) of a vehicle having at least one drum brake (4; 6), which can be used as a service brake via an electromechanical actuator device (16) and as a parking brake via a locking device (30) for selectively locking the electromechanical actuator device (16), with the method steps of determining an overload condition caused by a change in the brake temperature, in which overload condition, when the actuator device (16) is locked, an application force (24) of the drum brake (4;6) is greater than a predetermined parking force limit, and overcoming the overload condition by: generating an actuating force (22) by the electromechanical actuator device (16) while at least partially relieving the locking device (30), releasing the locking of the actuator device (16), and subsequently resetting the actuator device (16) against the direction of the actuating force, and locking the reset actuator device (16) by the locking device (30). The present invention further relates to a braking device (2) of a vehicle.;

A drum brake (1), in particular for a commercial vehicle, has a brake drum (2) rotatably mounted about an axis of rotation (AR), at least two brake linings (3) mounted in a receiving space (22) of the brake drum (2) with a respective friction lining carrier (32) and a friction lining (31) arranged on the carrier, and a clamping device arranged non-rotatably on an anchor housing (6) with a wedge ring (5) displaceable on a cylindrical sleeve (61) of the anchor housing (6) parallel to the axis of rotation (AR) of the brake drum (2), with which the brake linings (3) can be pressed radially towards an axis of rotation (AR) of the brake drum (2) against an inner surface (21) of the brake drum (2) designed as a friction surface, wherein the wedge ring (5) is mounted on at least two axial bearings (7a, 7b) spaced apart from each other in the circumferential direction of the cylindrical sleeve (61) and movable parallel to the axis of rotation (AD).

The invention relates to the technical field of brakes, in particular to a drum brake EMB structure which comprises a shell, a disc is arranged at one end of the shell, and a planet wheel set is arranged in the shell; the planet wheel set comprises a driving wheel rotationally arranged at one end of the shell, a driving shaft located in the shell is rotationally arranged on the driving wheel, a first-stage retainer is arranged on the driving shaft, a plurality of first-stage planet wheels are rotationally arranged on the first-stage retainer, and the first-stage planet wheels are all meshed with the driving wheel; after speed reduction and torque increase of the two-stage planetary gear set, power is output through the transmission shaft connected with the second-stage retainer. The cam arranged at one end of the transmission shaft rotates by a corresponding angle along with the transmission shaft, and the cam profile pushes the drum brake to expand outwards during rotation. Vehicle kinetic energy is converted into heat energy through friction force, and reliable braking is achieved.

The utility model relates to the technical field of drum brakes, and discloses a self-energizing drum brake which comprises a back plate, a connecting hole is formed in the back plate, the back plate is fixedly connected with a transmission shaft through the connecting hole, a brake drum is detachably installed on the back plate, a first pin rod is fixedly installed on the front side of the back plate, and a first brake shoe is rotatably installed on the first pin rod. The brake device has the advantages that the bottom ends of the first brake shoe and the second brake shoe can be controlled to be far away from each other, the two brake pads abut against the brake drum, the braking purpose is achieved, the L-shaped connecting rod can be controlled to rotate through unfolding of the first brake shoe, then the top supporting rod is driven to push the second brake shoe to be tightly attached to the brake drum, and braking is achieved. The extrusion force of the brake pad on the brake drum is enhanced, the contact area of the brake pad and the brake drum is increased, the brake force is enhanced, meanwhile, the abrasion of the brake pad is more uniform, and the service life of the brake pad is prolonged.

The invention discloses a heavy-duty vehicle electric wheel structure and a using method thereof, and belongs to the technical field of electric vehicle drive.The heavy-duty vehicle electric wheel structure comprises a rim, a planetary reducer and a drum brake are connected to the inner surface of the rim, a cavity is formed in the drum brake, and a hub motor is installed in the cavity; the hub motor is connected with the planetary reducer through a motor shaft, the planetary reducer comprises a sun gear, a planet gear, a gear ring and a planetary reducer shell which are sequentially connected, the sun gear is connected with the motor shaft, the planetary reducer shell is connected with the rim, and a motor shell, a motor outer end cover and a motor inner end cover are arranged on the outer side of the hub motor. The two sides of the motor shell are connected with the motor outer end cover and the motor inner end cover respectively, the drum brake comprises a brake drum, a brake shoe and a brake wheel cylinder which are connected in sequence, the brake wheel cylinder is connected with the motor inner end cover, the brake drum is connected with the rim, the motor shell is connected with the brake drum, the design and assembly processes of independent components are reduced, and therefore the manufacturing cost is reduced.

The utility model discloses a drum brake of a commercial vehicle and an axle assembly. The drum brake of the commercial vehicle comprises a brake bottom plate, two brake shoes and a cam shaft, the brake shoe comprises a wing plate, two opposite web plates and a friction plate, each web plate comprises a first end and a second end, a pin roller is installed between the first ends of the two web plates, a supporting pin is installed between the second ends of the two web plates, each web plate comprises a first section, a deviation section and a second section, the first section extends to the deviation section from the first end, and the second section extends to the deviation section from the second end. The offset section is connected between the first section and the second section so that the distance between the second sections of the two web plates can be larger than the distance between the first sections of the two web plates. Two pin holes are formed in the brake bottom plate, the supporting pins on the two brake shoes are connected into the two pin holes in a penetrating mode respectively, and the supporting pins are in interference fit with the inner walls of the pin holes. And an S-shaped cam is arranged on the cam shaft and is arranged between the pin rollers on the two brake shoes. According to the utility model, the problem of eccentric wear of the friction plate is solved, and the braking safety of a vehicle is improved.

An apparatus for a brake drum of a vehicle having a drum brake assembly with first and second brake shoes includes a motor with a pinion gear. A ball screw assembly has a nut for receiving torque from the pinion gear and a spindle threaded with the nut. The nut is aligned with the first brake shoe and the spindle is aligned with the second brake shoe. The motor is actuatable for rotating the nut to move the nut and the spindle away from one another for moving the brake shoes to apply braking force to the brake drum during a braking event. A bi-stable locking mechanism selectively locks the motor to prevent torque transfer from a back-driving ball screw assembly to the motor.

The invention relates to an electromechanical drum brake (10) for a motor vehicle and a motor vehicle having such a drum brake. The electromechanical drum brake (10) is equipped with: a drum (11) in which brake shoes (12) are arranged; a screw drive unit (14) driven by an electric motor for spreading the brake shoes (12), wherein the screw drive unit (14) is arranged between the brake shoes (12) and converts the rotary movement of the electric motor (13) into a translatory movement, wherein the screw drive unit (14) is arranged in a housing (15) in such a way that the screw drive unit (14) is displaceable in its axial direction (X) relative to the housing (15); and a stop element (16) for limiting a movement of the brake shoes (12) in the axial direction (X) of the screw drive unit (14), wherein the stop element (16) is arranged in a stationary manner with respect to the drum (11).

The invention discloses a forklift drive-by-wire drum brake control method and device based on a rapid nonsingular terminal sliding mode, and the method comprises the steps: 1) carrying out mechanism analysis for a mechanical structure and dynamic characteristics of a forklift drive-by-wire drum brake system, and building a dynamic model of the forklift drive-by-wire drum brake system; 2) according to the dynamic model established in the step 1, designing a fast nonsingular terminal sliding mode surface and a power reaching law so as to realize fast convergence of a system state; (3) according to the sliding mode surface and the reaching law designed in the step (2), a rapid nonsingular terminal sliding mode control algorithm suitable for the forklift drive-by-wire drum brake system is designed; and 4) based on the Lyapunov stability theory, proving that the control algorithm designed in the step 3 can enable the system state to converge to a balance point within finite time, and performing simulation on an MATLAB / Simulink platform to verify the effectiveness of the control algorithm in the forklift drive-by-wire drum brake system. And the response speed and the control precision of the drive-by-wire drum brake system of the forklift can be obviously improved.

The drum type brake pad hot-press forming mechanism comprises a bottom shell, straight columns are fixed to the four edges of the top face of the bottom shell, a top plate is fixed to the tops of the outer walls of the straight columns, a square shell is fixed to the top face of the top plate, and a hydraulic rod penetrates through the middle of the top face of the square shell and is fixedly installed in the middle of the top face of the square shell. The outer wall of the hydraulic rod penetrates through the middle of the top face of the top plate and is fixedly connected with the middle of the top face of the top plate, a disc is fixed to the bottom face of the telescopic end of the hydraulic rod, a sliding plate is fixedly installed on the bottom face of the disc, sliding holes are formed in the four edges of the top face of the sliding plate, and the inner walls of the sliding holes of the sliding plate are slidably connected with the outer walls of the straight columns. A resistance heating rod is fixedly mounted on the inner wall of the cavity of the sliding plate, and the drum brake pad is ejected out through the arc-shaped plate, so that the problem that the mold stripping effect of the brake pad is poor due to the fact that the drum brake pad is easily clamped in a mold is solved.

For controlling electromechanically actuatable brakes of servo type construction, it is necessary to detect the forces acting on the abutment of the brake shoes. The abutment is therefore formed from a massive material which deforms under load, wherein measurement devices are provided which detect this deformation. The shape of the abutment is selected in such a way that the abutment has measurement gaps, the size of which changes when the abutment is loaded. The size of the measurement gaps can be sensed by means of Hall sensors or AMR sensors, for example.

An actuator for a heavy vehicle foundation brake (e.g. disc or drum brake), and a brake assembly including the actuator. The actuator includes: an actuator housing 111 having an outboard end fixable t

The present application relates to a drum brake, which includes a brake arm; a brake shoe; a base; and a brake torque detection device; the brake shoe is hinged on the brake arm through a brake shoe shaft, the brake arm is provided with a shaft hole penetrating through the brake shoe shaft, and the shaft hole is an oblong shaft hole, and a hole wall at one side of the oblong shaft hole is provided with a wear-resistant strip configured for pressing against the brake shoe shaft during braking of the drum brake; the brake torque detection device includes a sensing plate and a tension and compression sensor arranged on the sensing plate; one end of the sensing plate is connected to the brake shoe shaft, and the other end of the sensing plate is connected to the brake arm.

The mechanical double-leading and double-trailing drum brake comprises a brake drum, a brake bottom plate and two sets of brake units, the two sets of brake units are oppositely installed on the front face of the brake bottom plate in a left-right mode, and each brake unit comprises a leading brake shoe block, a trailing brake shoe block and a rotating cam arranged between the leading brake shoe block and the trailing brake shoe block. The two rotating cams are connected with the same connecting rod arranged on the back face of the brake bottom plate. The brake drum is uniformly stressed by taking the leading shoe block and the trailing shoe block as central symmetry with the circle center of the brake bottom plate, so that the brake drum and a hub bearing are protected from being damaged or even damaged by deflection force, and the service life of the brake drum and the hub bearing is greatly prolonged; and in addition, due to the arrangement of the double-leading double-trailing four-shoe block, the service life of the drum brake is prolonged, the friction force is uniform, the braking effect is better, the personal safety of a driver is ensured, and the braking is safer and more reliable.

The drum brake comprises a brake drum, a shoe block assembly and a one-way ratchet wheel assembly, the shoe block assembly comprises a transmission shaft, a shoe block and a first elastic piece, the transmission shaft is connected with the brake drum in a pivoted mode around the axis of the transmission shaft, and the transmission shaft is connected with the shoe block. The transmission shaft rotates around the axis of the transmission shaft in the first direction so as to drive the shoe block to move from the initial position to the brake position abutting against the brake drum, the first elastic piece presses the shoe block towards the initial position, the one-way ratchet wheel assembly comprises a crank, a ratchet wheel and a pawl, the ratchet wheel is coaxially connected with the transmission shaft, and the crank is pivotally connected with the ratchet wheel around the axis of the ratchet wheel. The crank is suitable for driving the ratchet wheel to synchronously rotate in the first direction through the pawl. The drum brake provided by the utility model has the advantages of high convenience in extension compensation of the brake cable, long service life of the shoe block and low use cost.

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.