Abstract: A disk brake for a utility-vehicle wheel includes a brake caliper reaching around a brake disk, an application device arranged in the brake caliper on one side of the brake disk actuated by means of a force member, brake pads on both sides of the brake disk. At least the application-side brake pad is arranged in a pad duct having first and second supporting surfaces which have the same distance from a pad duct center line in the circumferential direction, and against which the brake pad lies, a brake lever which is part of the application device and is composed of a lever arm supporting the force member, and an application shaft connected to the lever arm and mounted inside the brake caliper on a pivot axis and resting in a rotationally movable manner against a pressure piece working against the application-side brake pad.

Abstract: A system and method for an electromechanically actuable parking brake for motor vehicles, which is embodied as a drum brake of the “duo-servo” type. The parking brake has a brake actuating device which can be actuated by an electromechanical actuator, is designed as an expander element and acts on two brake shoes, the expander element being supported via a spring energy storage device, may be designed as a diaphragm spring assembly, and being spreadable by a predetermined length of travel, when the parking brake is actuated, to apply an application force. In order to provide a sufficiently large hot parking travel, the length of travel travelled by the expander element to apply the application force when the parking brake is actuated can be moved as a function of at least one motor vehicle state parameter.

Abstract: An air brake monitoring system which provides a warning signal, either visual or audible, to truckers informing them when their brake system needs corrective attention. More particularly, the system of the present invention permits the brake monitoring system to be easily adjusted to account for the needs and desires of the individual vehicle operator.

Abstract: To provide the drum brake with the automatic shoe clearance adjustment apparatus to reduce the cost of the drum brake as reducing the number of components. The first engagement portion is provided between the brake lever and the strut body to engage the brake lever and the strut body without operating the service brake, and the second engagement portion is provided also to engage the brake lever and the strut body while automatically adjusting the shoe clearance.

Abstract: An axle assembly having two hubs, each for connection to a wheel, a housing for differential gears and a mounting arrangement for a braking system for braking a connected wheel. The housing has a depression formed therein. The depression is configured so as to accommodate: (a) when the mounting arrangement has a drum brake mounted thereon, movement of a slack adjuster of the drum brake in a direction away from one of the hubs nearest the drum brake so as to allow detachment of the slack adjuster; and/or (b) when the mounting arrangement has a disc brake mounted thereon, an air chamber of the braking system, wherein the air chamber is capable of being partially accommodated within the depression.

Abstract: The invention presents a method and an arrangement for renewing the braking force of a brake of a hoisting machine. In the method the brake pad of a brake of the hoisting machine is pressed against the braking surface of a rotating part of the hoisting machine and the braking surface is moved in relation to the brake pad pressed against the braking surface by resisting the friction force between the braking surface and the brake pad.

Abstract: An improved automatic slack adjuster for reducing slack in the brake of a vehicle, in which a one-way clutch assembly is arranged at a side of the automatic slack adjuster housing, and one-way motion-inhibiting pawls in the one-way clutch assembly act on one-way gear teeth disposed on an inner radius of a gear wheel within the assembly whose outer circumference drives a slack adjuster unit. The incorporation of the one-way clutch within the anchor unit of the adjuster provides an automatic slack adjuster which can be produced at a reduced cost, manufactured more easily, and provides for improved adjustment performance with much reduced dependence on the lubricity of grease used.

Abstract: Disclosed herein is an electronic mechanical drum brake. In the electronic mechanical drum brake including a drum rotated together with a wheel, a pair of brake shoes respectively including rims provided with linings, which rub against the inner circumferential surface of the drum and generate braking power, attached thereto and webs provided on the inner circumferential surfaces of the rims to reinforce rigidity of the rims, and an actuator provided between the webs of the pair of brake shoes, the actuator includes a screw shaft provided with a driven gear formed integrally therewith and a left-handed thread at one side thereof and a right-handed thread at the other side thereof, a driving motor to rotate the screw shaft in a regular direction and its reverse direction, a booster unit to increase rotary force of the driving motor and then to transmit the increased rotary force to the driven gear, and nuts screw-connected to both ends of the screw shaft and fixed to the webs.

Abstract: A vehicle drum brake includes: a first brake shoe; a second brake shoe; a parking brake lever connected with the second brake shoe; a pull unit connected with the parking brake lever; a strut including a curved portion which is curved towards an outer circumferential side of the backing plate, the strut being disposed between a portion of the parking brake lever which lies closer to the portion where the pull mechanism is connected than the portion where the parking brake lever is attached and the first brake shoe; a strut return spring for returning the strut in a non-operating state to its initial position is provided to extend between the strut and the second brake shoe; and an engagement hole formed in the curved portion of the strut for one end portion of the strut return spring to be brought into engagement therewith.

Abstract: Brake equipment, for an elevator installation, includes: a static element; a movable element movable relative to the static element in a first degree of freedom, wherein selectably a first frictional contact is produced in a first contact surface between the static element and the movable element by a controllable normal force acting in a second degree of freedom, and a first friction force opposes movement of the movable element relative to the static element; and a relative element, wherein a second frictional contact is produced in a second contact surface between the movable element and the relative element by the normal force, and a second friction force opposes movement of the movable element relative to the relative element. The relative element is movable in the first degree of freedom relative to the static element between a normal position and a braking position and is resiliently biased into the normal position.

Abstract: A parking brake (10) having a drum containing first and second brake shoe portions (11, 12), a handbrake lever (18) pivoted (19) adjacent one end on one (11) of the brake shoe portions and a strut (20) extending between a first abutment on the handbrake lever and a second abutment (21) on the other (12) of the brake shoe portions. Pivoting of the handbrake lever relative to said one brake shoe portion (11) moves the strut (20) which in turn moves the other brake shoe portion (12) away from said one brake shoe portion to bring the shoe portions into contact with the drum thus applying the parking brake. One of the abutments is in the form of a biased wedging means (21) which acts on the strut (20) to take up all play in the thrust path between the handbrake lever (18) and the other brake shoe portion (12) via the strut.

Abstract: A drum brake has a pair of brake shoes (40) moveable radially outwardly into contact with an associated brake drum to provide a handbrake function by a cross strut (100) which acts between the brake shoes or between pivoting brake operating levers (14) which actuate the brake shoes. A handbrake lever (18) is pivoted on one brake shoe or brake operating lever (14) and contacts one end of the strut to displace the other brake shoe or brake operating lever towards the drum to apply the associated shoe against the drum and by reaction through the strut to also force the other brake shoe or brake operating lever toward the drum to apply the other shoe against the drum. The strut (100) is in two parts (101,102), one part being connected for movement with each respective brake shoe or operating lever, the strut parts having inter-engageable formations in the form of teeth (103,104) which when engaged allow the strut (100) to transmit axial force between the shoes or operating levers.

Abstract: An elevator installation has an elevator car that moves in a vertical direction along guide tracks and is braked or held at standstill by a braking equipment. The braking equipment includes at least two brake units, at least one of the brake units, but preferably each of the brake units, is provided with a wear-compensating device which, when the brake unit is opened or released, sets a clearance distance between a brake lining and an associated brake surface, which clearance arises on opening of the brake unit, in correspondence with a substantially constant value. Thereby, use may be made of customary and thus economic brake materials which may wear during braking.

Abstract: To provide the drum brake device enables the assembly of the strut assembly (20) while the brake shoes (11, 12) are being positioned on the backing plate (10). In the drum brake device equipped with the incremental type automatic shoe clearance adjustment apparatus, the strut assembly (20) is structured to be assembled from the opposite direction of the backing plate (10) relative to the pair of brake shoes (11, 12).

Abstract: A magnetic resistor control assembly for a body training machine comprises a main shaft; a rotor, a stator, an adjusting unit, a sliding block set and a controller. An inner disk and an outer disk clamp of the stator clamping the adjusting unit. The sliding block set has guide tracks, an outer lateral wall of each guide track having a track trench. A lower middle portion of the sliding block set has a round hole; the roller being installed and rollable in the guide track; and the retaining rod of the roller is placed within the track trench. A controller is installed at an outer side of the stator; the controller having a transfer pin which displace in the straight grooves. When the transfer pin drives the sliding block set to move in the straight grooves, the gap between permanent magnets and the magnetic isolation ring is changed.

Abstract: This invention relates to an improvement on Automatic Brake Adjuster with flexible reference point wherein one-way lock mechanism and clutch mechanism are integrated in one part and located on the worm shaft with the provision of isolating the one way lock mechanism and regulator worm gear wheel from heavy clutch spring load by a thrust sleeve arrangement for independent function. One-way lock mechanism is meant for sensing the excess lining clearance and adjusting the slack between the brake lining and brake drum whereas the clutch mechanism is to ignore the excess stroke of brake actuator due to elasticity in the foundation brake parts of a vehicular braking system.

Abstract: An improved self-adjusting automatic slack adjuster for reducing slack in the brake of a vehicle is provided, in which an easily accessible external operating feature permits the automatic slack adjuster's one-way clutch assembly to be readily disengaged to allow smooth release and retraction of the brake shoes of a vehicle brake without damage to the one-way teeth of the clutch assembly. When the external feature is operated in a brake release direction, the motion of the feature is translated into a motion which axially displaces an output part of the one-way clutch away from an input part of the clutch a distance sufficient to disengage the parts' one-way teeth, thereby disengaging the one-way clutch to permit brake shoe retraction without resistance from the one-way clutch.

Abstract: A disc brake, particularly for utility vehicles, including a caliper that straddles at least some outer circumferential sections of a brake disc. A device for applying the brake is disposed entirely, or in part, in the caliper. A wear adjusting system is arranged in the caliper and is used for adjusting the lifting clearance between the brake pads and the brake disc. The wear adjusting system is provided with at least one adjusting device in the form of a rotary mechanism. A recharageable energy accumulator, such as a flat coil spring, is provided as a drive unit for the rotary mechanism.

Abstract: A method of manufacturing a drum brake engagement fork. The method includes selecting a blank of flat sheet material, forming the blank so as to have tongue portions on one side and grooves on the other side of said blank, forming a tube from the blank with the side seam interlocked, and coining the side seam thus formed, and then flattening one end portion prior to forming a pair of tines therein. It also provides an engagement or adjusting fork made by the above process.

Abstract: A disc brake has a brake disc and a brake caliper spanning the brake disc. A brake applicator shaft is supported on the brake caliper and arranged transversely to an axis of rotation of the brake disc. The brake applicator shaft has a rotary lever for actuating the brake applicator shaft. An adjusting device provided with a thrust spindle having an end face facing away from the brake disc is provided. The brake applicator shaft transmits upon brake application a brake force through the thrust spindle onto the brake disc. A monitoring device is provided that has a measuring element moveable relative to the brake caliper and resting against the end face of the thrust spindle.

Abstract: Disclosed is a brake caster with stroke adjustment mechanism, including a retainer, a king pin, a catch spring, a catch/release button, a plunger block, and a brake pad. The upper part of the king pin is fitted with the spring coil; the catch/release button is fitted with the catch spring; and a threaded polygonal lock nut is placed over the catch/release button in the hollow space of the plunger block, which has the brake pad installed on the bottom end; the plunger block being coupled with the catch/release button is slipped onto the king pin lengthwise along the threads. By twisting the plunger block in and out around the neck of the plunger block, the stroke distance can be adjusted according to different levels of rubber on the wheel, so that the service life of the caster can be effectively prolonged without numerous replacements of the wheels.

Abstract: A drum brake device prevents shoe clearance over-adjustment by using a thermo-sensitive member with a lower leg opening force and provides a smaller thermo-sensitive member with a lower cost. A portion between both ends of the brake lever (50) in a direction of crossing the shoe return inhibitor (61) engages with one end of the shoe return inhibitor (61) automatically restricting the return position of the pair of brake shoes (20) and (30); the proximate portion (50a) of the brake lever (50) is pivotally supported on the brake shoe (20); and the free end (50b) of the brake lever (50) is supported at an end nipple (54) of a brake cable (52) via the thermo-sensitive member (73).

Abstract: This invention is a new type of drum brake and its variants for motor vehicles, the shoe mechanism assembly of which has at least one set of interconnected shoe mechanism and automatic adjusting mechanism of brake clearance. The interconnected shoe mechanism consists of two interconnected composite shoes of multiple degrees of freedom. Each composite shoe consists of a shoe and a driving lever. The shoe is jointed to the driving lever with a cylindrical pin or a elliptical pin matching with a cylindrical hole or a spherical joint, and the driving lever is pivoted on the backplate of brake with a cylindrical pin or a elliptical pin matching with a cylindrical hole or a spherical joint. The automatic clearance adjusting mechanism is fixed on the backplate and interconnected with the driving lever.

Abstract: An automatic clearance adjusting device 10 that automatically adjusts the position of brake shoes (3, 4) based on the wear includes an adjuster gear that is rotatably depending on the amount of how much the brake shoes are parted from each other, a cam plate (25) rotated integrally with the adjuster gear (23) to drive the strut (27) that restricts the position of the brake shoes (3, 4), and an adjuster restricting lever (33) that restricts the rotation of the adjuster gear (23) based on the pressing force from the wheel cylinder (6) that parts between the pair of brake shoes (3, 4).

Abstract: The invention relates to a method for actuating a wheel brake assembly, in particular an electromechanical wheel brake assembly (10) or a mechanical system involving friction and having spring elasticity. To increase a braking force once a quasi-static terminal state of the wheel brake assembly (10) is reached, the invention proposes actuating the wheel brake assembly (10) for a brief period of time in the release direction and then to re-tighten it; the period of time of the actuation in the release direction is selected to be so brief that the braking force is reduced, if at all, only imperceptibly.

Abstract: An electromechanically actuatable disk brake with a self-boosting device includes a wear readjusting device which can for instance be adjusted by means of an electric motor as an actuator, to compensate for wear of a restoring device.

Abstract: A dual mode drum brake device of this invention is subject to lightning and low-cost without over braking during the parking brake operation. Pistons 10, 11 in a cylinder device 9 push and rotate brake shoes 2, 3 to be separated apart around an abutment point with an anchor 8 during the service brake operation, thereby functioning as a leading trailing brake. An operation force W of the parking brake rotates a lever 14 in a counterclockwise direction around a pin 13, one end of the lever 14 rotates the brake shoe 3 outwardly around a protuberance 12a via the pin 13, and the other end of the lever 1 rotates the lever 12 in a clockwise direction via a strut 15 around the protuberance 12a to rotate the brake shoe 2 outwardly around the abutment point with the anchor 8 via the protuberance 12a.

Abstract: A brake adjuster for adjusting the working clearance of the shoes of an automotive drum brake, the adjuster including three co-axial elements a first rod element (25) having a head portion for engagement with a first brake shoe and a threaded stem portion, an intermediate element (28) in threaded engagement with the first rod element and a second rod element (27) having a head portion for engagement with a second brake shoe and a stem portion slideably connected with the intermediate element (28) and free to rotate relative thereto. A reaction member (30) is mounted on the intermediate element (28) and a ring gear (35) is provided on the intermediate element which is axially located between the second rod element and the reaction member. A leaf spring (31) acts between the second rod element (27) and the reaction member (30) for pushing the second rod element away from the intermediate element (28).

Abstract: A drum brake assembly, adjuster strut (10) being adjustable and having axially extended and retracted conditions. The strut includes means (11, 35) for engaging braking members (3), a rotatable member (27) rotatable about the lengthwise axis of the strut, an axially movable member (34) movable upon forward rotation of member (27) to lengthen the strut in the retracted condition, and biasing means (24) for biasing the strut toward the axially extended condition upon radial expansion of the brake shoes during brake actuation. The rotatable member has a face (30) and a cam surface (31) formed thereon and defining teeth formed in a ring. The strut includes an arm (37) which is mounted to pivot and an end portion (40) biased into engagement with the surface (31). In use, the arm causes the rotatable (27) member to rotate in a forward direction during axial extension of the strut.

Abstract: An adjuster mechanism in a drum brake wherein a rotation of a star wheel on a shaft of an extendable strut is limited to a single increment define the pitch of a plurality of teeth on the star wheel. The limitation is achieved by a lever that is carried by a web of a brake shoe has a first blade that in perpendicular alignment with a first tooth of the plurality of teeth while a second blade is offset from a second tooth and located in a plane that is substantially parallel with the pitch. When the lever is pivoted on the web through a predetermined angle, the first blade slides into engagement with a third tooth while the second blade moves through the offset and into engagement with the second tooth to connect the lever with the star wheel. Any further pivoting of the lever by movement of the web toward the drum results in the lever and star wheel moving together.

Abstract: The invention provides a brake caliper backdrive apparatus and method of backdriving a brake caliper. The apparatus includes a brake caliper, a motor including a shaft operably attached to the brake caliper and, a biasing member operably attached to the shaft. The biasing member backdrives the motor thereby releasing the brake caliper. The method includes rotating a shaft to clamp the brake caliper, storing energy in a biasing member responsive to the shaft rotation, and reversing the shaft rotation using the stored energy.

Abstract: A disc brake having a ball-in-ramp actuator retained in a caliper for supplying a piston with a static clamping force to move first and second friction members into frictional engagement with a rotor to effect a parking brake application. The clamping force is transmitted from the ball-in-ramp actuator into the piston through an adjustment screw mechanism. The disc brake being susceptible to a thermal expansion and a thermal contraction and as a result the effect of the clamping force applied to bring the first and second friction members into engagement with the rotor may change during a time period that the parking brake application is initiated until it is terminated.

Abstract: A drum-in-hat park brake assembly for a vehicle wherein first and second brake shoes are retained and aligned on a backing plate by first and second pins. The first and second shoes are moved into engagement with a drum by a force applied to an actuator by a cable assembly. The backing plate is characterized by a flange having a slot therein and the cable assembly is characterized by a cable with a fitting on a first end that has a stem with an annular rib thereon. The stem passes is passed through the slot while the annular rib engages the flange to limit the movement of the first end of the cable toward the actuator and to limit the movement of the first end toward the actuator mechanism to prevent the lever from being axially moved past a position of rest and change the radial alignment between the first and second brake shoes and the backing plate by the action of a release spring.

Abstract: A brake assembly utilizes a conical brake drum and matching conical brake lining assembly to provide a more efficient braking system. An adjuster mechanism with a pair of conical adjuster members is controlled by an electric motor and worm gear drive. As the lining wears, the adjuster mechanism pulls the conical adjuster members towards one another to force the brake linings outwardly to maintain a predetermined distance between the drum and the brake lining assembly.

Abstract: An automatic stroke adjustment device for a brake actuator having clutch rings (240, 340, 440, 540, 546, 640) making an irreversible screw engagement relatively rotatable for the amount of exceeding the backlash by releasing the clutch engagement to rotate when exceeding the backlash of reversible screw engagement and maintaining the clutch engagement when in releasing the brake actuator while the brake actuator is in an active state to improve the processability, reduce the weight, and prevent overadjustment of the shoe clearance during the thermal expansion of the brake drum.

Abstract: A dual leading-shoe drum brake system includes two actuating levers that engage brake shoes. The levers are located between upper and lower anchors, with the bottoms of the actuating levers engaging the lower anchor as a fulcrum. A hydraulic cylinder is arranged to engage the upper ends of the levers to force them apart during braking. A brake shoe is positioned adjacent each lever so that the shoes are forced outward with the levers. The brake shoes selectively engage the upper and lower anchors during braking to receive the braking forces depending on the direction of rotation of the brake drum. The levers preferably float with respect to the backing plate, and the shoes are connected to the lever to float with them. A parking brake lever is arranged to engage an automatic adjusting link to provide dual leading-shoe operation during braking also.

Abstract: An adjuster strut (10) for use in a drum brake assembly. The adjuster strut (10) has an adjustable elongate extent with first and second engagement means (17,37) disposed at opposite ends thereof for engaging opposed braking members (11,12,35) of a brake assembly. The first engagement means (17) is arranged for receipt and support within an inwardly opening slot (19,20) formed in one of the braking members (11,12,35) and includes an end face (18) for abutting engagement with the inner end wall (19a,20a) of the slot opening (19,20). The first engagement means (17) further includes a first channel (21) extending rearwardly from the face (18), for receiving therein an edge or wall portion (hereinafter an “edge portion”) defining the slot opening (19,20). The braking members can include opposed cross-sectionally T-shaped brake shoes and a parking brake lever disposed adjacent the inwardly extending web of one of the brake shoes.

Abstract: The invention discloses a brake shoe adjuster. In a preferred embodiment, the invention discloses floating adjusters with a single adjusting rod. One specifically disclosed embodiment shows an hydraulic adjuster with an adjusting rod, forming a plunger or piston, in an hydraulic cylinder, and driven by grease forced into the cylinder by a grease gun through a zerk grease fitting. Another specifically disclosed embodiment shows a mechanical adjuster with a rod, forming a rack, driven by a pinion gear.

Abstract: A drum brake assembly including a rotatable drum having a radially inner braking surface and a brake shoe of single piece construction and of generally circular form mounted within the drum against a backing plate. The brake shoe has a radially outer face and a friction lining mounted thereon in facing relationship to the radially inner braking surface. Actuator having actuated brake on and released brake off conditions and being operable in the actuated condition to diametrically expand the brake shoe is provided. Positioners are also provided for positioning the brake shoe within the drum when the actuator is in the brake off condition to provide for complete clearance between the outer face of the friction lining and the inner braking surface of the drum. A grinding jig for grinding friction lining is also provided. A brake assembly having a connector for connecting the brake shoe to the backing plate.

Abstract: An adjuster strut (10) for use in a drum brake assembly (1) to shift the brake shoes (3) of the assembly (1) radially outwardly so as to compensate for wear in brake friction lining. The strut (10) being of adjustable elongate extent and having axially extended and retracted conditions. The strut (10) including engagement means (11, 35) disposed at opposite ends thereof for engaging opposed braking members (3) of the brake assembly (1), a rotatable member (27) which is rotatable about the lengthwise axis of the strut (10), an axially movable member (34) which is movable axially upon forward rotation of rotatable member (27) to lengthen the elongate extent of the strut (10) in the retracted condition, and biasing means (24) for biasing the strut (10) toward the axially extended condition upon radial expansion of the brake shoes (3) of the brake assembly (1) during brake actuation.

Abstract: A parking brake assembly for an automotive drum brake is provided. The parking brake assembly replaces a conventional mechanical strut with an electronic strut actuator subassembly that provides for parking brake engagement and disengagement, sensing of brake lining wear and adjustment of brake shoe-to-drum clearance.

Abstract: A parking brake assembly for an automotive drum brake is provided. The parking brake assembly replaces a conventional mechanical strut with an electronic strut actuator subassembly that provides for parking brake engagement and disengagement, sensing of brake lining wear and adjustment of brake shoe-to-drum clearance.

Abstract: A brake cylinder device with an effective adjustment bolt processing and with an improved air bleeding effect, wherein an adjustment bolt (40) as a component of an automatic shoe clearance adjustment mechanism, wherein an external thread stem (40a) makes an irreversible engagement with a piston (22), performing brake shoe expansion, and a brake fluid feeding groove (40b) is formed on a periphery of the external thread stem (40a) is designed to be spiral.

Abstract: This invention provides a duo-two leading type drum brake device which simplifies a drum brake structure as well as improves a transmission efficiency of a application force from a shoe actuator to brake shoes. A pivot lever 60 has an intermediate portion pivotally supported on the brake shoes 40. A shoe-actuator 20 is positioned adjacent to the first anchors 30, 30 and being disposed between the ends 60a, 50a of the pivot lever 60 and the other brake shoe 50. A strut 70 is positioned between and functionally engaged with the other ends 60b, 50b of the pivot lever 60 and the other brake shoe 50. An application force of the shoe actuator 20 is transmitted to the brake shoe 40 via a pivot section of the pivot lever 70 and transmitted to the other brake shoe 50 directly from the shoe-actuator 20 and indirectly via the strut 70.

Abstract: A small diameter duo two leading type drum brake that can mount a built-in parking brake mechanism. The brake has a link mechanism that includes a pivot lever that is rotatably and pivotally supported at a central region of a first brake shoe. A first strut is provided between a first end of a pivot lever and a second brake shoe. A second strut is substantially parallel to the first strut and is provided between the second end of the pivot lever and the second brake shoe. A parking brake actuator is provided to activate the link mechanism to open the pair of first and second brake shoes. A service brake actuator has an automatic shoe clearance adjustment device and one of the first and second struts has an automatic parking stroke adjustment device.

Abstract: An adjuster for establishing the non-braking position of a vehicular brake pad assembly which takes the form of a shaft that is mounted in a sleeve with the inner end of the shaft to threadably engage with a series of female threads mounted within the sleeve. The shaft includes a manually connectable star wheel. A seal is located between the sleeve and the shaft which prevents entry of dust and water within the sleeve. A star wheel is mounted on the shaft and is manually connectable to affect rotation of the shaft relative to the sleeve which will result in the shaft longitudinally moving relative to the sleeve.

Abstract: It is an object of this invention to provide an automatic shoe clearance adjustment device for a drum brake mechanism designed to improve its durability by eliminating a gap, which is caused due to the manufacturing tolerances between the operating end surface of a brake shoe and the extended portion of an adjustment lever. To that end, a long hole (81) is formed to extend horizontally in the actuating direction of a service brake actuator (50); and the adjustment lever (80) is pivotally supported via a pin (14) with a capacity of making a rotation relative to the brake shoe (20) and a capacity of making a relative slide in approximately the same direction in which the service brake actuator (50) operates.

Abstract: A drum brake assembly (10) having first (12) and second (14) brake shoes retained on a backing plate (16). Each of the first (12) and second (14) brake shoes have an end (22,24) aligned on a hydraulic actuator assembly (26) and an end (28,30) aligned on an anchor block (40). An adjustable strut mechanism (32) has a extendable shaft (33) that includes a first end member (34) that engages the first end (22) of said first brake shoe (12), a second end member (36) that engages the first end (24) of the second brake shoe (14) and a rotatable stem (35). A first resilient member (150) urges the first (12) and second (14) brake shoes toward the hydraulic actuator assembly (26) and second resilient member (48) urges the first (12) and second (14) brake shoes toward the anchor block (40). The length of the extendable shaft (33) is adjusted by ratcheting a pawl (65) rotating the stem (35) to establish a predetermined running clearance between the first (42) and second (44) friction members and drum (46).

Abstract: A shoe clearance over-adjustment prevention apparatus employable to various types of automatic shoe clearance adjustment devices and drum brakes and designable to have a common thermo-sensitive member suitable for mass production. The thermo-sensitive member 60 is sandwiched between the strut 20 and the brake lever 30 to cause a functional engagement, and if the brake temperature reaches a predetermined value or range, the strut 20 is pushed toward the brake shoe 12 so as to disable the automatic shoe clearance adjustment operation.

Abstract: A brake cylinder device with an effective adjustment bolt processing and with an improved air bleeding effect, wherein an adjustment bolt (40) as a component of an automatic shoe clearance adjustment mechanism, wherein an external thread stem (40a) makes an irreversible engagement with a piston (22), performing brake shoe expansion, and a brake fluid feeding groove (40b) is formed on a periphery of the external thread stem (40a) is designed to be spiral.