271results about "Mechanically actuated drum brakes" 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.

In some aspects, a transmission device with a reverse braking function includes a housing seat having a seat hole; a driven shaft rotatably and at least partially supported in the seat hole; a brake block arranged on the driven shaft and rotatable together with the driven shaft, the brake block being movable relative to the driven shaft between a braking position where the brake block abuts against the housing seat and a release position where the brake block is separated from the housing seat; an elastic member coupled to the driven shaft and the brake block and configured to press the brake block towards the braking position; and a drive member coupled to the driven shaft.

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.

A brake system may include: a drum; a brake shoe including a frictional member applying frictional force to the drum; a motor moving the brake shoe; a force sensor detecting clamping force of the frictional member to the drum; and a controller electrically connected to the motor and the force sensor, and the controller may determine a first position of the frictional member to the drum at a braking force generation start time based on current applied to the motor or torque of the motor upon controlling the motor for braking, and control the motor so that an interval between the drum and the frictional member is adjusted based on the first position when the force sensor is in a failure state upon controlling the motor for releasing the braking.

Rotatable joints may include one or more braking assemblies. The one or more braking assemblies may control a degree of movement of the rotatable joint to provide a range of damping. In some instances, the braking assemblies may include brake band(s) that tighten and loosen around a hub, or other rotatable member of the rotatable joint. The amount of braking, or tautness of the brake band(s), may be variably controlled to arrest the hub by different amounts. In some instances, the tightening of the brake band(s) around the hub may be controlled using linear actuator(s) and / or magnetic element(s). Implementing braking assemblies having controlled actuation may improve control of rotatable joints without adding cost, complexity, weight, or bulk.

A brake device for a motor vehicle has an expansion unit which is designed to, proceeding from a neutral position, in the one driving direction generate a service brake, and in the other driving direction generate a self-locking of a function of a parking brake. For this purpose, the expansion unit has a nut / spindle unit which optionally interacts with an axial bearing or a friction-fitting coupling unit.

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

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 an electromechanical spreading device (2) for a drum brake of a vehicle, comprising: an electric motor (4) having an output (6); a cam disc (12) which is connected to the output (6) in a torque-transmitting manner and which is arranged between two actuating elements (8, 10) for simultaneously actuating the two actuating elements (8, 10) in a braking action, a first actuating element (8) of the two actuating elements having a spring element (18) which is arranged between an actuating tappet (14) and a support (16), and a second actuating element (16) of the two actuating elements having a spring element (18) which is arranged between the actuating tappet (14) and the support (16), wherein the cam disc (12) is connected in a torque-transmitting manner to an actuating disc (20) of a step gear (22) and the step gear (22) is connected in a force-transmitting manner to a second actuating element (10) of the two actuating elements, in such a way that the second actuating element (10) can be adjusted in the direction of a brake shoe movable thereby by means of a rotation of the cam disc (12) in an engagement angle range of rotation in a first direction of rotation, and can be adjusted by means of the cam disc (12) The stepping gear (22) has an engagement angle range in which rotation in a second direction of rotation, which extends opposite the first direction of rotation, is adjusted away from the brake shoe in the opposite direction, in which engagement angle range the operating disc (20) is in torque-transmitting engagement with the rest of the stepping gear (22).

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.

A brake load measuring device of a motor vehicle brake, has a brake load sensor inserted centrally as an integral piston stop into a receiving cross bore of a housing in alignment between the pistons in the receiving cross bore. The brake load sensor is inserted in such a way that the pistons are seated in alignment with each other diametrically opposite each other on both sides of the brake load sensor. In an embodiment, a decoupled structure with a distanced offset is proposed for the protection of the load sensing system.

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.

A method for actuating a brake arrangement, wherein a pawl defined for locking and unlocking a parking brake functionality of a brake arrangement otherwise embodied as a service brake is used. A method for actuating a brake arrangement comprises rotating a shaft in a first direction with a drive to apply a brake, rotating the shaft in a second direction with the drive to release a brake; and moving a pawl between a first position and a second position along a rectilinear travel distance with one of an actuating device and the drive. In the first position, the pawl is spaced apart from a gearwheel connected to the shaft in a fixed rotation ratio and in the second position, is in engagement with the gearwheel or can be brought into engagement by rotation of the shaft in the second direction.

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).

[Problem] A design is provided that is capable of suppressing the rattling of an input element. [Solution to the problem] A leaf spring 6 has: two held sections 43, which are arranged on both sides of an input-side engagement section 14 in respect of a second direction perpendicular to a first direction, which is a direction of movement of a pressing surface 33, which moves away from or towards a pressed surface 7 and a central axis of an input element 3, and are held elastically between the input-side engagement section 14 and an input-side gripped section 34; and a base section 44, which connects the two held sections 43.

An automatic conveyor device system and a braking device therefor. A braking device includes: a brake drum; a brake arm, with a brake lining provided thereon; a spring member that acts on the brake arm, urging the brake lining on the brake arm to make contact with the brake drum; an electromagnetic actuator, including an electromagnetic rod, where when the electromagnetic actuator is energized, the electromagnetic rod lifts the brake arm to separate the brake lining of the brake arm from the brake drum; and a sensor, configured to monitor a first position and a second position with a given spacing a during the extending process of the electromagnetic rod, and to respectively output a first signal and a second signal when the electromagnetic rod passes through the first position and the second position.

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 method for electronic air gap control of an electrical motor vehicle brake system comprises electrical wheel brakes, wherein a resting position is adopted and maintained by supplying electric energy. Mechanical elements for adjusting the resting position can thus be dispensed with. Furthermore, an electrical motor vehicle brake system comprising electrical wheel brakes for carrying out such an electronic air gap control method is described.

A patient support apparatus having a central dual control system of casters with an actuating pedal. Two opposite casters are connected by a control shaft with hexagonal cross section. Both control shafts are mutually coupled via a connecting member to a linkage rod. A servomotor with a rack is coupled to the linkage rod. The servomotor is configured to change a position of the rack of the servomotor and thus change a position of the central dual control system of casters upon manual change of position of the actuating pedal and / or upon electrical activation of the servomotor to change a position of the actuating pedal to another position of the central dual control system of casters.

A brake device and a contact element (6) which can be brought into engagement with same and can be moved relative to the brake unit. The brake unit has an activation element (9) and at least one brake element (2), wherein the activation element acts on the transmission element (5) for the displacement of the brake element in the direction of the contact element as far as making contact with the latter by way of the brake shoe (3). In order to utilize the actual movement force for braking purposes, the brake shoe (3) is connected via a disengagement element to a displaceable transmission element (5) which, on account of a transverse force which emanates from the contact element (6), is disengaged from an activation position into an extreme position, in which the force absorption corresponds ultimately to the transverse force. Therefore, a brake operation can be carried out on account of the transmission of the movement force from a contact element to a brake unit via a brake shoe which is mounted on a disengagement element, which brake unit can act both as an emergency brake and as a parking brake.

The present invention relates to an electric, self-adjusting park brake assembly for locking a wheel hub of a stationary towed vehicle in a substantially motionless state. The park brake assembly includes a brake drum configured to rotate correspondingly with the wheel hub, and one or more brake shoes located internally or externally of the brake drum and configured to be operated such that the minimum pressing force required to engage and thereby lock the brake drum is consistently applied by the brake shoe(s) irrespective of the wear rate of the brake shoe(s). A radial pressing force is applied on a surface of the drum by moving the shoe(s) radially until they frictionally engage the surface to an extent that substantially prevents rotation of the wheel hub. The assembly further includes one or more electric motors configured to activate the brake shoe(s), and a switch electrically connected to the electric motor(s).

The present invention discloses an automatic adjustment drum brake for electric vehicles, which includes a brake chamber housing part, a friction shoe part, a camshaft, a rocker arm, a toggle mechanism, and an automatic adjustment mechanism. A friction shoe part is provided inside the brake chamber housing part, a tooth structure is provided outside the cam body, the toggle mechanism rotates the camshaft, the automatic adjustment mechanism stays in its original position, and slides and rotates at the same angle relative to the toggle mechanism. A reset spring is provided between the toggle mechanism and the brake chamber housing part, the toggle mechanism returns under the action of the reset spring, and the camshaft maintains its angle by adjusting the automatic adjustment mechanism. The toggle mechanism and the automatic adjustment mechanism are adjusted to fit the tooth structure provided outside the cam body by a ratchet wheel. This solves the problem that the gap between the shoe part and the wheel hub of the existing brake becomes large due to long-term wear, and the brake gap adjustment is not timely and accurate, and the hand feels heavy.

Provided is a new angular position holding device comprising a joint member (4) in which a female engagement part (16) and a male engagement part (18), although disposed at different axial positions on the same axis, can be integrally molded through powder metallurgy. In the joint member 4, an annular thick part 21 is provided at a corner section between the outer peripheral surface of an opposite-side bearing part 14 having the male engagement part 18 and the opposite-side surface of an intermediate plate 10 in the axial direction.

To provide a novel angle position holding device 2 including a joint member 4 that can be integrally molded with powder metallurgy despite the fact that a female engagement part 16 and a male engagement part 18 are coaxially arranged in axially different positions.SOLUTION: A joint member 4 is provided with an annular thick wall part 21 in a corner part between an outer peripheral surface in the other side bearing part 14 including a male engagement part 18 and the other side surface in an axial direction of an intermediate plate 10 to which a female engagement part 16 and a proximal end of the male engagement part 18 are connected.SELECTED DRAWING: Figure 1

The present invention relates to a method for determining a braking torque (Mb) of an electromechanical drum brake (2) comprising a brake drum (3) and two displaceable brake shoes (4, 5), and comprising a controllable actuator (9) comprising an electric motor (10) and an actuator element (11) coupled to the electric motor (10), wherein the actuator element (11) cooperates with the brake shoes (4, 5) to displace them and is held displaceably in a positively guided or almost positively guided manner by an actuator bearing (19). It is provided that only one or at least one force acting on the actuator bearing (19) is detected and a direction of action of the force is determined, and that the braking torque (Mb) is calculated as a function of the detected force and direction of action.

A drum brake assembly includes first and second brake pad assemblies and a wear sensor device. A wear sensor device includes a sleeve, a plunger, and a sensor. The sleeve is coupled to the first brake pad assembly. The plunger is coupled to the second brake pad assembly. A sensor provides a signal indicative of a position of the plunger relative to the sleeve.

The utility model relates to the technical field of electric vehicle accessories, in particular to a brake drum structure for an electric vehicle, which comprises a wire sleeve, a connecting disc and a clamping cover, and an arc-shaped brake pad A and an arc-shaped brake pad B are respectively arranged at two ends of the inner side of the connecting disc. A wheel brake cylinder is connected between the top end of the arc-shaped brake pad A and the top end of the arc-shaped brake pad B through a fastening plate, a rocker arm A and a rocker arm B are arranged on the inner side of the arc-shaped brake pad A and the inner side of the arc-shaped brake pad B respectively, and an adjusting spring is arranged at the lower end of the wheel brake cylinder. An arc-shaped limiting plate is mounted on the inner side of the connecting disc and located at the bottom joint of the rocker arm A and the rocker arm B through a fixing plate; the dustproof and waterproof brake drum cover is used for an electric vehicle brake drum structure, the dustproof and waterproof effects are greatly achieved, the brake drum is effectively protected, all parts are prevented from being affected with damp and rusted, the service life is prolonged, the protection performance is good, the function of absorbing moisture in the clamping cover is achieved, and dryness of the interior is guaranteed.

An output shaft is configured by connecting a first shaft and a second shaft, coaxially arranged with each other, by a reverse input cutoff clutch 20; an end portion on one side in an axial direction of the second shaft located on an opposite side from the first shaft with a gear portion sandwiched in between in the axial direction being rotatably supported with respect to a fixed portion by a bearing device; the reverse input cutoff clutch having a function that, when rotational torque is input to the first shaft, transmits the rotational torque input to the first shaft to the second shaft, and when rotational torque is reversely input to the second shaft, completely cuts off the rotational torque reversely input to the second shaft and does not transmit the rotational torque to the first shaft, or transmits part of the rotational torque to the first shaft and cuts off the remaining portion.

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).