399results 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.

A strain wave-type gearbox comprises: a flex spline component; an outer circular spline component; and a wave generator component, wherein the wave generator component is configured for adjustment of at least one dimension of the wave generator component, to cause engagement and disengagement of the flex spline component and the outer circular spline component. A drive arrangement for manipulating a vehicle control surface comprises: a first drive; a second drive; an output member for connecting to the vehicle control surface; first engaging means for selectively engaging and disengaging the first drive and the output member; and second engaging means for selectively engaging and disengaging the second drive and the output member, wherein the first engaging means comprises a strain wave-type gearbox.

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.

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.

The concept described herein relates to a pedal having a pedal body, a pedal axis which extends at least partly through the pedal body, wherein the pedal body is supported to be rotatable on the pedal axis, and an adjustable rotation brake which, during rotation of the pedal body, exerts an adjustable braking force on the pedal axis in order to brake the rotation of the pedal body when compared to an unbraked rotation.

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.

Disclosed herein is an actuator unit and an electro-mechanical drum brake including the same. An actuator unit includes a front housing including a worm shaft engagement provided with a worm shaft insertion hole on a back surface and protruding forward therefrom, a first bearing receiving portion extending to a rear side of the worm shaft insertion hole, a worm shaft support engagement extending to a rear side of the first bearing receiving portion, and a cylinder portion disposed on a lower side of the worm shaft engagement, a rear housing provided with a motor embedded portion and engaged with the front housing, a motor embedded in the motor embedded portion, a worm shaft including a first bearing disposed between an outer circumferential surface and the first bearing receiving portion and a worm disposed on a front end side and coupled to the worm shaft engagement and rotated by receiving a rotational force from the motor, an actuating portion including a pair of actuating pistons embedded in the cylinder portion and moving to opposite sides of the cylinder portion by a worm wheel transmitting a rotational force from the worm and rotating thereon, and a worm shaft support coupled to the worm shaft support engagement to support a rear surface of the first bearing.

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.

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.

The invention relates in its core to an automotive parking brake system for a rotating drive train 2, comprising a wheel 3 which is fundamentally rotatable and, if required, electrically lockable by means of a translationally relative displaceable locking element 4 for electrical locking and for holding without current by means of a positive engagement in the wheel 3, comprising an electric locking actuator 5,35 for translationally guided displacement of the locking element 4 from a release position I to a locking position II by means of a defined applied actuator force, with an electronic control and / or regulating unit 7 (ECU, WCU), wherein the electric locking device 1 comprises at least one aggregated sub-assembly / sub-module 10.

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).

The invention relates to an electric drive system (10), with a housing (12), with at least one electric machine (14) which has at least one rotor (20) rotatable relative to the housing (12), and with a parking lock device (26), which has a locking toothing (28) provided on the rotor (20) and thus co-rotatable with the rotor (20) and at least one locking pawl (36), which is movable relative to the rotor (20), the locking toothing (28) and the housing (12), between a locking position and a release position. In the locking position, the locking pawl (36) engages in the locking toothing (28), so securing the rotor (20) against rotation relative to the housing (12). In the release position, the locking pawl (36) does not engage in the locking toothing (28), so meaning that the locking pawl (36) releases the rotor (20) to rotate relative to the housing (12), wherein, at least in the release position, the locking toothing (28) is arranged further outward in the radial direction of the electric drive system (10) and thus of the electric machine (14) than the locking pawl (36), and wherein teeth (64) of the locking toothing (28) protrude from a main body (G) in the axial direction of the electric machine (14).

An arrangement for actuating at least one pawl (1) for locking or releasing a rotatable transmission component (2) for shifting a gear in a bottom bracket gearbox (3) of a bicycle or pedelec (4) is proposed, wherein the pawl (1) can be actuated via a first rotatably actuated cam ring (5) to engage a locking tooth (6) of the transmission component (2), wherein the transmission component (2) is associated with at least one band brake (10) which can be actuated via a second rotatably actuated cam ring (7), wherein the first cam ring (5) and the second cam ring (7) each have a cam track (8, 9) along their outer circumference for actuating the pawl (1) and the band brake (10). Furthermore, a bottom bracket gearbox (3) with at least one arrangement and a bicycle or pedelec (4) with the bottom bracket gearbox (3) are proposed.

[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.

The utility model relates to the technical field of drum brakes, in particular to a single-pin non-equal-thickness brake pad braking system which comprises a braking bottom plate, a brake shoe pin is fixed on the braking bottom plate, a cam is rotatably connected with the braking bottom plate, and two brake shoes are coaxially arranged in a center hole of the braking bottom plate. One end of the brake shoe is clamped with the brake shoe pin through a cotter pin hole, the other end of the brake shoe abuts against the S-shaped concave arc of the cam through a roller, and the brake shoe is pulled through a limiting spring and a return spring. Two brake pads are attached to the outer arc face of the brake shoe, and the two brake pads are gradually thickened from the two ends to the middle. According to the brake system, the brake shoe is connected through the single pin, so that the product structure is simplified, the product weight is reduced, the brake pad is thickest in the middle position of the brake shoe surface, namely a brake point during braking, and is gradually thinned towards the two ends, the brake area can be effectively kept for a long time, and light weight of the product is achieved.

In order to provide a newly improved brake load measuring device for a motor vehicle brake, a brake load sensor (8a, b, c) is inserted centrally into a transverse receiving hole (16) in a housing in alignment between the pistons (9a, b) to provide an integral piston stop, so that the pistons (9a, b) sit in mutual alignment and diametrically opposite each other on either side of the brake load sensor (8a, b, c). In a special embodiment of the invention a separated arrangement with a distanced offset Δ is proposed to protect the load measurement sensor system.

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.