KR100839951B1 - An automatic brake adjuster for adjusting the slack between the brake lining and brake drum of a vehicular braking system - Google Patents

Abstract

The present invention provides a body 1, a one-way lock / clutch seat 29 that forms a clutch mechanism by interlocking serrations, and a one-way lock sleeve 28 that forms a one-way lock mechanism to incorporate an integrated one-way clutch mechanism in the worm shaft. And an automatic brake adjuster which detects excessive wear of the lining and automatically corrects it to maintain an optimum clearance.

Brake, Regulator, One Way Lock / Clutch Seat, One Way Lock Sleeve

Description

TECHNICAL BRAKE ADJUSTER FOR ADJUSTING THE SLACK BETWEEN THE BRAKE LINING AND BRAKE DRUM OF A VEHICULAR BRAKING SYSTEM}

FIELD OF THE INVENTION The present invention relates to an automatic brake adjuster having a flexible reference point, wherein a one-way lock device and a clutch device are integrated into a single part, and are driven from a strong clutch spring load by a thrust sleeve device for independent function. An automatic brake adjuster, arranged on a worm shaft, having a structure for separating a one-way lock device and a regulator worm gear wheel. The one-way lock device is for detecting excessive lining clearance and adjusting the slack between the brake lining and the brake drum, while the clutch device is due to the elasticity in the basic brake parts of the vehicle braking system. It is to ignore excessive stroke of the brake actuator.

In commercial large vehicles such as trucks, trailers and buses. In general, the camshaft drum brake of the 'S' shape is widely used. A brake shoe with a brake lining is placed on the 'S' shaped camshaft and pressed against the brake drum during brake application. The splined portion of the camshaft of the 'S' shape protrudes from the brake drum.

The brake adjuster connects the 'S' camshaft to the push rod of the brake actuator. The brake adjuster is fitted at one end to the spline portion of the 'S' camshaft and at the other end to the push rod of the brake actuator. The air pressure applied to the brake actuator is a mechanical force transmitted to the camshaft of the 'S' shape through the push rod as a braking force that inflates the brake shoe and presses the lining against the brake drum to apply the brake.

The automatic brake adjuster functions as a lever that transfers braking force from the brake actuator to the 'S' camshaft, and as a mechanical device that detects excessive lining clearance and adjusts the slack between the brake lining and the brake drum to an optimum value.

In the prior art, it is known that the automatic brake adjuster is used as a lever connecting the push rod of the brake actuator and the spline cam shaft of the 'S' cam brake. The 'S' cam brake consists of a brake drum, a brake shoe and an 'S' cam shaft. The brake shoe is pressed against the brake drum during application of the brake by the 'S' camshaft. The automatic brake adjuster is used to transfer the braking force to the 'S' cam brake by means of a pneumatically actuated brake actuator.

Detecting the looseness of the brakes due to lining wear by the automatic brake adjuster can be by stroke or by clearance between the lining and the drum.

According to the stroke principle, the adjustment depends entirely on the push rod stroke of the brake actuator, in other words, the angular movement of the automatic brake adjuster is changed by the gap between the brake lining and the brake drum.

According to the niche principle claimed as an advanced system, the adjusting device is able to sense various factors, such as the resiliency of the brake drum and other structural parts of the brake, to vary the push rod stroke, The wear of the brake lining can be distinguished to optimize the lining clearance to ignore the effects of one excessive push rod stroke.

The first object of the present invention is to automatically detect and correct excessive wear of the lining to maintain the optimum clearance. During normal operation of a brake of the known art, the clearance between the brake lining and the drum increases due to lining wear, increasing the push rod stroke of the brake actuator applying the brake. It is essential to maintain optimum clearance for effective braking and to manually adjust periodically to maintain clearance. It is therefore a primary object of the present invention to provide an automatic brake adjuster with an internal device that detects excessive wear of the lining and rotates automatically, wherein the worm shaft is engaged with the worm wheel in order to maintain an optimum clearance. S 'camshaft ", thereby maintaining the angular motion of the automatic brake adjuster to a desired limit.

Another object of the present invention is to provide a reliable automatic brake adjuster, which is a stabilizer that overcomes limitations on space utility and can work in extremely bad environmental conditions and severe loads and vibration conditions.

It is a further object of the present invention to provide an automatic brake adjuster in which the adjustment of the excessive lining clearance is made during the return stroke of the brake, rather than adjusting the excessive lining clearance during brake application as is known in the art.
EMBODIMENT OF THE INVENTION Below, this invention is demonstrated with reference to attached drawing which shows preferable embodiment of this invention only as an example.

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1 is a front view of an automatic brake adjuster according to the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a cross sectional view along line AA ′ of FIG. 1 showing the pinion and control arm assembly;

FIG. 4 is a cross sectional view along line C-C in FIG. 3 showing the placement of a predetermined gap in the pinion assembly. FIG.

Reference numerals in the accompanying drawings are as follows.

1: auto brake adjuster body 2: tail hole

3: worm wheel 3 ': internal spline

4: Worm shaft 4 ': Hexagonal part

4 ": Clutch Serration 5: Bearing Retainer

6: regulator worm wheel 7: thrust bearing

8: gasket 9: strong compression spring

10: spring seat 11: spring retainer

12: control gear wheel 13: control arm

13 ': fixing part of the control arm 14: cover plate

15: sealing ring 16: pinion

17: sealing ring 18: screw

19: Control Worm Screw 20: Guide

21: screw 22: spring

23: spindle 24: torsion spring

25: sealing ring 26: thrust sleeve

27: one-way lock spring 28: one-way lock sleeve

29: one-way lock / clutch seat

28'-29 ": Locking surface of the unidirectional lock sleeve

29 '-Serration of one-way lock / clutch seat

30: retaining ring

G: preset gap between the stepped surface of the control worm screw 19 and the stepped portion of the pinion 16

D: The control worm screw 19 meshes with the regulator worm wheel 6.

E: The worm wheel 3 meshes with the worm shaft 4.

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In known automatic brake adjusters, the angular motion of the adjuster is sensed by a control arm attached to a fixture of the vehicle chassis to establish a reference point. However, it is desirable to provide a flexible reference point for easy installation to various models of the automatic brake adjuster body and also for easy installation for the user during reinstallation and after maintenance to avoid additional worries required for initial installation. Do. In order to overcome the above problem, the control arm of the automatic brake adjuster according to the present invention is designed to have a floating reference point.

In general, (a) reduction of gear ratio between control gear and pinion and (b) reduction of gear ratio between control worm screw and regulator worm wheel are adjusted during each brake application while compensating for excessive slack due to lining wear. Only part of it is fixed to occur.

In this aspect, it is desirable to adjust excessive clearance during the brake return stroke rather than during the brake application stroke to reduce wear and increase the life of the part.

The automatic brake adjuster according to the invention for adjusting the slack between the brake lining of the vehicle braking system and the brake drum mainly comprises the following components.

(a) Body (1) connectable to brake actuator.

(b) clutch device. In this clutch device, the one-way lock / clutch seat 29 forms a clutch together with the rotatable worm shaft 4 by means of interlocking serrations, which worm shaft 4 is perpendicular to its axis. In engagement with the arranged worm wheel 3, the one-way lock / clutch seat 29 is held through a thrust sleeve 26 against a strong compression spring 9 preset to the desired load. The thrust sleeve 26 ensures free rotation of the regulator worm wheel 6 by bypassing the load of the strong compression spring 9. This clutch device releases the worm shaft 4 from the regulator worm wheel 6 and the one-way lock device during the deflection stroke of the brake.

(c) One-way lock device. This one-way lock device is a one-way lock sleeve 28 and a locking surface 28'-29 of the one-way lock / clutch seat 29 that can engage the worm shaft 4 in the clutch serration 4 "-29 '. ") And the other end of the one-way lock sleeve 28. As shown in FIG. The other end of the one-way lock sleeve 28 is connected to the regulator worm wheel 6 by slots of the locking surfaces, and the one-way lock spring 27 detects excessive lining clearance due to wear and automatically adjusts. Do it. All these parts avoid overriding the clutch serration of the worm shaft 4 and the one-way lock / clutch seat 29 when the clutch is released, and on the thrust sleeve 26 for easy assembly manufacture and maintenance. Is held by a retaining ring 30.

(d) control arm assembly. The control arm assembly is a rotatable control arm 13 having a fixed portion 13 ′ fixed to the vehicle chassis to provide a reference point, and integral with the control arm 13 and in the bore of the worm wheel 3. And a control gear wheel 12 positioned and circumferentially toothed.

(e) Pinion (16) having a stepped surface that can engage the stepped surface of the control worm screw (19). Here, the gap G between the stepped surfaces ensures a radial clearance and a desired slack, that is, a clearance stroke. The control worm screw 19 is engaged with the regulator worm wheel 6 to adjust the function of the one-way lock device by the rotation of the control gear wheel 12 (D).

According to the invention, the automatic brake adjuster comprises a body 1 having a hole 2 in its tail for connecting to a brake actuator. The other end of the body houses a rotatable worm wheel 3 having an internal spline for fixing to the 'S' camshaft. The rotatable worm shaft 4 which meshes with this worm wheel 3 is located in the body 1 perpendicular to the axis of the worm wheel 3.

For manual rotation by a spanner, one end of the worm shaft 4 has a hexagonal portion 4 'protruding from the body 1. On this hexagonal part side, thrust sleeve 26, regulator worm wheel 6, one-way lock sleeve 28, one-way lock / clutch seat 29, and one-way lock spring 27 are provided with thrust bearing 7 and It is mounted together with the bearing retainer 5. This bearing retainer 5 is screwed into the body 1 and guides the worm shaft 4. The thrust sleeve 26 and thrust bearing 7 are used to hold the one-way lock / clutch seat 29 so as to be freely rotatable against the load of the strong compression spring 9. The one-way lock device is formed between the one-way lock sleeve 28 and the locking surface serrations 28'-29 "of the one-way lock / clutch seat 29 together with the one-way lock spring 27, and the regulator worm wheel 6 ) And a sealing ring 25 is installed in the groove of the worm shaft 4. In order to prevent the ingress of foreign particles, on the other side of the worm shaft 4, the spring sheet 10 ), A strong compression spring 9, and a spring retainer 11. The spring retainer 11 is screwed onto the body 1 to set the desired spring load.The clutch device is a one-way lock / clutch. It is formed by the serration 29 'of the sheet 29 and the serration 4 "of the worm shaft 4. The engagement of this clutch is ensured by the strong compression spring 9 which loads the worm shaft 4.

The control arm assemblies 12-15, 17 are located in the body in the same bore of the worm wheel 3 and are independently operable. The rotatable control gear wheel 12 of the control arm assembly having gear teeth circumferentially is integral with the control arm 13 with the fixing portion 13 ′. In order to prevent the ingress of foreign particles, a cover plate 14 is installed between the control gear wheel 12 and the control arm 13 together with the sealing rings 15 and 17.

The control arm assemblies 12-15, 17 are fixed to the body 1 together with the gasket 8 by screws 18 at the peripheral holes of the cover plate 14. The control arm 13 is a rotatable attachment of the control arm assemblies 12-15, 17. The fixing arm 13 'of the control arm is firmly fixed to the vehicle chassis, the purpose of which is to provide a reference point for the automatic brake adjuster as described below.

The control gear wheel 12 meshes with the pinion 16 and is located in the worm wheel bore of the body 1. The position of the pinion 16 is shown in FIGS. 3 and 4.

The pinion 16 and the control worm screw 19 are aligned by the spindle 23 with the guide 20 and are held by the screws 21. The gap G provided between the stepped surface of the pinion 16 and the bore surface of the control worm screw 19 achieves the desired slack (also called the clearance stroke of the automatic brake adjuster) between the brake shoe and the brake drum. To this end, free movement is initially given during rotation of the pinion 16 by the control gear wheel 12.

Of the one-way lock sleeve 28 and the locking surfaces 28'-29 " of the one-way lock / clutch seat 29, which can engage the one-way lock sleeve 28 and the worm shaft 4; It is formed between the other ends, and the other end of the one-way lock sleeve 28 is connected to the regulator worm wheel 6 by slots of these locking surfaces, and the one-way lock spring 27 detects excessive lining clearance due to wear. All these parts avoid thrusting of the clutch serrations of the worm shaft 4 and the one-way lock / clutch seat 29 when the clutch is released, and the thrust sleeves for easy assembly manufacturing and maintenance. It is held by a retaining ring 30 on 26.

According to the present invention, an automatic brake adjuster having a flexible reference point has an integral one-way lock and clutch device on the worm shaft. The function of the one-way lock device is to detect excessive lining gaps due to wear and make adjustments automatically, while the function of the clutch device is to separate the worm shaft from the regulator worm wheel during the deflection stroke of the brake actuator, and both devices Are held together by a retaining ring. Providing a one-way lock in a larger area increases the life of the one-way lock device, and the retention of all these parts by the retaining ring not only simplifies assembly fabrication, but also for worm shaft clutch serrations during the deflection stroke of the brake actuator. By separating the clutch seat from overriding, it is possible to increase the life of the clutch serrations of the worm shaft and one-way lock / clutch seat.

The controlled radial clearance between the control worm screw and the pinion is ensured by the gap provided between the step surface of the pinion and the step surface of the control worm screw, and the assembly of the pinion and control worm screw on the spindle together with the torsion spring Ensure the desired slack or control distance for the automatic brake adjuster to maintain clearance between the lining and brake drum. The pinion and control worm screw are aligned with each other by the spindle and are retained by screws with guides to facilitate easy disassembly and reassembly, as shown in the accompanying drawings (FIG. 3). These parts are assembled in the body with compression springs at the bottom.

Next, the operation of the automatic brake adjuster will be described. Its structure and functionality have been described above.

When the brake is applied with excessive lining clearance during initial brake application, the pinion 16 is rotated by the control arm assemblies 12-15, 17 rigidly mounted to the vehicle chassis, due to the movement of the lever. During the initial period of this operation, the pinion 16 is free to rotate until the preset gap G between the stepped surface of the control worm screw 19 and the stepped surface of the pinion 16 is closed. This free rotation of the pinion 16 ensures a predetermined clearance stroke of the automatic brake adjuster. At the same time, the worm wheel 3 is rotated counterclockwise with the body 1 of the automatic brake adjuster, and then the 'S' cam shaft engaged with the worm wheel spindle 3 'lifts the brake lining toward the brake drum. Rotated to

During further rotation (after passing the clearance stroke cycle), the control worm screw 19 is also rotated by the pinion 16 together with the regulator worm wheel 6 to rotate the one-way lock sleeve 28. As the other part of the one-way lock device, that is, the one-way lock / clutch seat 29 is firmly engaged with the worm shaft serration formed as the clutch device, the one-way lock sleeve 28 counters the load of the one-way lock spring 27. Overriding at engagement surfaces 28'-29 "and being in a new position when there is excessive clearance between brake drum and brake lining.

This is caused by the worm shaft 4 due to excessive friction on the worm shaft with the serration 29 'of the one-way lock / clutch seat 29 fully engaged with the serration 4 "of the worm shaft 4. This is because rotation of the one-way lock / clutch seat 29 is prevented.

Once the brake lining engages the brake drum, the reaction force increases, the worm shaft 4 moves while compressing the strong compression spring 9 in the axial direction, and the serration portion of the worm shaft 4 "is one-way lock / The clutch is released as it moves away from the serration 29 'of the clutch seat.

When the clutch is released, the resistance to the one-way lock / clutch seat 29 is removed, and the one-way lock sleeve 28 and regulator worm wheel 6 as a whole unit in which the one-way lock / clutch seat 29 maintains its relative position. Is allowed to rotate together. Thus, the lever movement during this period (expansion / deflection zone) is ignored.

When the brake is released, the pinion 16 is rotated clockwise by the control gear wheel 12 as opposed to the brake application direction, and the control worm screw 19 is connected with the regulator worm wheel 6 and the one-way lock sleeve 28. And the rotation of the pinion 16 as a whole unit together with the one-way lock / clutch seat 29 to cover the deflection stroke of the automatic brake adjuster. However, the worm shaft 4 remains stationary when the clutch is released between the serration 4 "and the serration 29 '.

Once the brake lining moves away from the brake drum, the force is reduced and the load of the strong compression spring 9 moves the worm shaft 4 to engage the clutch, thus freeing the rotation of the one-way lock / clutch seat 29. prevent.

During the further release movement of the brake actuator, the body 1 keeps rotating clockwise, and the control gear wheel 12 has a closed gap between the control worm screw 19 and the pinion 16 with the torsion spring 24. Continue to rotate pinion 16 with control worm screw 19 until recovery against. This movement covers the clearance streaks of the automatic brake adjuster that were achieved during the initial brake application period. However, the one-way lock / clutch seat 29 and one-way lock sleeve 28 together with the regulator worm wheel 6 are prevented from rotating by friction in the clutch engaged state during this period.

During the final release rotation of the automatic brake adjuster, the pinion 16 rotated by the control gear wheel 12 rotates the control worm screw 19 together with the regulator worm wheel 6 and then rotates the whole one-way device. The worm shaft 4 engaged with the one-way lock / clutch seat 29 is rotated, and then the worm wheel 3 and the 'S' cam shaft are rotated to adjust the lining clearance. This is proportional to the new engagement that occurred during the brake application stroke described earlier.

The function described in the last paragraph is only applicable to brake application with excessive lining clearance, where the one-way lock sleeve 28 is engaged in a new position and is later released as described above. Whenever the brake is applied with the optimum brake lining clearance, the overriding of the one-way lock sleeve on the one-way lock / clutch seat does not occur after completing the clearance stroke of the automatic brake adjuster.

In a preferred embodiment as described herein and shown in the drawings, an automatic brake adjuster having a floating reference point for the one-way lock and clutch device according to the invention for adjusting the slack between the brake lining and the brake drum of the vehicle braking system is ,

(a) the main body 1 having a hole 2 in the tail portion connectable to the brake actuator,

(b) a rotatable wheel having a spline therein, rotatable therein provided in another part of the body for receiving an 'S' camshaft;

(c) a serration (4 ") of a rotatable worm shaft (4) installed perpendicular to the worm wheel (3) and engaged with the worm wheel (3) and worm shaft (4) guided by bearing retainers (5). Unidirectional lock / clutch seat 29 with serration 29 'engaged with the slewing sleeve 26, on the thrust sleeve 26, and the one-way lock so that the clutch device and the one-way lock device rest on the worm shaft 4 / One-way lock / clutch sleeve 28 that engages clutch seat 29 and a regulator positioned on thrust sleeve 26 mounted on worm shaft 4 and capable of engaging a one-way lock / clutch sleeve 28. A one-way lock / clutch device comprising a worm wheel 6,

(d) One direction that can engage the worm shaft 4 through the thrust sleeve 26 with respect to the strong compression spring 9 to separate the regulator worm wheel 6 and the one-way lock sleeve 28 for free movement. A bearing retainer 5 which holds the lock / clutch seat 29 together with the thrust bearing 7,

(e) Restrains the regulator worm wheel 6 and the worm shaft 4 to isolate the clutch seat serration 29 'from overriding on the worm shaft clutch serration 4 "while the clutch is in the released state. A retaining ring 30 provided on the thrust sleeve 26 to

(f) the one-way lock device and the clutch device are placed on the worm shaft 4,

(g) The one-way lock device and the clutch device are integrated as a single part in the one-way lock / clutch seat.

An automatic brake adjuster having a floating reference point for the one-way lock and clutch device for adjusting the slack between the brake lining of the vehicle braking system and the brake drum,

(a) a main body 1 having a hole 2 in the tail portion connectable to the brake actuator,

(b) a rotatable wheel having a spline therein, rotatable therein provided in another part of the body for receiving an 'S' camshaft;

(c) a one-way lock / clutch device,

i) a rotatable worm shaft 4 having a serration 4 "and installed perpendicular to the axis of the worm wheel 3 to engage the worm wheel 3;

Ii) one-way lock / clutch seat 29 having a serration 29 'engaged with a serration 4 "of the worm shaft 4 guided by the bearing retainer 5,

Iii) a hexagonal end of the worm shaft 4, which is engageable via a slot with a one-way lock sleeve 28 having a serration 28 ', and is located on a thrust sleeve 26 with a one-way lock spring 27; A one-way lock device comprising a regulator worm wheel 6 mounted at 4 ',
V) a strong compression spring 9 mounted on the other end of the worm shaft 4 together with the spring seat 10 and the spring retainer 11;

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Iii) a sealing ring 25 fixed in the groove of the worm shaft 4,

베어링) The bearing retainer 5 together with the thrust bearing 7 is provided with a thrust sleeve 26 against the strong compression spring 9 to isolate the regulator worm wheel 6 and the one-way lock sleeve 28 for free movement. Holds the one-way lock / clutch seat 29 through

Iii) the spring retainer 11 is screwed correspondingly to the body 1 in order to preset the spring load,

Iii) the one-way lock / clutch seat 29 forms a clutch by a serration 29 'which seats on the serration 4 "of the worm shaft,

Iii) the strong compression spring 9 loads the worm shaft 4 to ensure the clutch is engaged,

Iii) the one-way lock sleeve 28 forms a lock by the serration 28 'which seats at the other end to the serration 29 "of the one-way lock / clutch seat 29,
One-way lock / clutch device,

d) a control arm assembly,

A rotatable control arm 13 with a fixed portion 13 ',

A control gear wheel 12 positioned in the bore of the worm wheel 3 with teeth at the circumference and integral with the control arm 13,

A cover plate 14 mounted with sealing rings 15, 17 between the control gear wheel 12 and the control arm 13,

The gasket 8 is joined by a screw 18 in the peripheral holes of the cover plate 14 to ensure a firm attachment to the body 1,

The fixing part 13 ′ is firmly fixed to the vehicle chassis to provide a reference point,
A control arm assembly,

e) pinion assembly,

A pinion (16) having a stepped surface and engaged with the control gear wheel (12),

A control worm screw 19 having a stepped surface engaged with the stepped surface of the pinion 16,

The spindle 23, the guide 20 and the screw 21 align the pinion 16 with the control worm screw 19,

The gap G between the stepped surface of the pinion 16 and the bore surface of the control worm screw 19 has a radius to allow free movement initially during the rotation of the pinion 16 by the control gear wheel 12. To secure the directional clearance, to secure the required radial movement between the brake shoe and the brake drum to achieve the desired slack known as the clearance stroke of the automatic brake adjuster,
Pinion assembly.

It is apparent that the preferred embodiments of the invention disclosed are designed to achieve the objects described above, and the invention is well understood by those skilled in the art, and all changes and modifications without departing from the spirit of the invention are contemplated in the specification and claims of the invention. It will be appreciated that it is included.

Claims (2)

An automatic brake adjuster with a floating reference point for adjusting the slack between the brake lining of the vehicle braking system and the brake drum, A main body (1) connectable to the brake actuator, A worm wheel (3) rotatable and splined therein provided in another part of the body for receiving an S camshaft, A serration of the rotatable worm shaft 4, which is installed perpendicular to the worm wheel 3 and engaged with the worm wheel 3, and the worm shaft 4 guided by the bearing retainer 5. On thrust sleeve 26 with a one-way lock / clutch seat 29 having a serration 29 'engaged with the ") and a one-way lock spring 27 with a serration 28'. A one-way lock sleeve 28 positioned at and a regulator worm wheel 6 engageable by a slot at the locking surface with the one-way lock sleeve 28, wherein the one-way lock device and the clutch device are worm shafts 4; A one-way lock and clutch device mounted on the worm shaft 4 so as to be on, Thrust bearing (7) through the thrust sleeve (26) against the strong compression spring (9) to separate the regulator worm wheel (6) and the one-way lock sleeve (28) for free movement. Bearing retainer (5), The regulator worm wheel 6 and the worm shaft to isolate the serration 29 "of the one-way lock / clutch seat from overriding on the serration 4" of the worm shaft while the clutch is in the released state. A retaining ring 30 provided on the thrust sleeve 26 to restrain (4), The one-way lock and clutch are located on the worm shaft, The one-way lock device and the clutch device are integrated as a single part in the one-way lock / clutch seat. An automatic brake adjuster with a floating reference point for adjusting the slack between the brake lining of the vehicle braking system and the brake drum, A main body (1) having a hole (2) in the tail which can be connected to the brake actuator, A worm wheel (3) rotatable and splined therein provided in another part of the body for receiving an S camshaft, One-way lock and clutch device, A rotatable worm shaft (4) having a serration (4 "), installed perpendicular to the axis of the worm wheel (3) and engaged with the worm wheel (3), Of the worm shaft 4 with a bearing retainer 5 which has a serration 29 ′ that engages the serration 4 ″ of the worm shaft 4 and which can be engaged to guide the worm shaft 4. One-way lock and clutch device including a one-way lock / clutch seat 29 mounted at an end thereof; As a one-way lock device, To be engaged by a slot on the locking surface with a regulator worm wheel 6 located on the thrust sleeve 26 with a one-way lock spring 27 and mounted on the hexagonal end 4 'side of the worm shaft 4. One-way lock sleeve 28, which may have a serration 28 ', A strong compression spring 9 installed with the spring seat 10 and the spring retainer 11 at the other end of the worm shaft 4, A sealing ring 25 fixed in the groove of the worm shaft 4, The bearing retainer 5 together with the thrust bearing 7 passes through the thrust sleeve 26 against the strong compression spring 9 to separate the regulator worm wheel 6 and the one-way lock sleeve 28 for free movement. Holds the one-way lock / clutch seat 29, The spring retainer 11 is screwed into the body 1 to preset the spring load, The one-way lock / clutch seat 29 forms a clutch by a serration 29 'which sits on the serration 4 "of the worm shaft 4, The strong compression spring 9 applies a load to the worm shaft 4 to ensure the engagement of the clutch, The one-way lock sleeve 28 forms a lock by a serration 28 'which seats on the serration 29 "of the one-way lock / clutch seat 29, One way lock device, A control arm assembly, A rotatable control arm 13 with a fixed portion 13 ', A control gear wheel 12 positioned in the bore of the worm wheel 3 with teeth at the circumference and integral with the control arm 13, A cover plate 14 mounted with sealing rings 15, 17 between the control gear wheel 12 and the control arm 13, The gasket 8 is secured by screws 18 in the periphery of the cover plate 14 to ensure a firm attachment to the body 1, The fixing part 13 ′ is firmly fixed to the vehicle chassis to provide a reference point, A control arm assembly, A pinion assembly, A pinion (16) having a stepped surface and engaged with the control gear wheel (12), A control worm screw 19 having a stepped surface that can engage the stepped surface of the pinion 16, The spindle 23, the guide 20 and the screw 21 align the pinion 16 with the control worm screw 19, The gap G between the stepped surface of the pinion 16 and the bore surface of the control worm screw 19 is radial in order to allow free movement initially during the rotation of the pinion 16 by the control gear wheel 12. To secure the clearance, to secure the radial movement required between the brake shoe and the brake drum to achieve the desired slack known as the clearance stroke of the automatic brake adjuster, An automatic brake adjuster comprising a pinion assembly.

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