CN210889858U - Automatic adjusting arm with abrasion alarming function - Google Patents

Abstract

The utility model provides a take wearing and tearing alarming function's automatic adjustment arm belongs to mechanical technical field. It has solved the problem that current automatic adjustment arm wearing and tearing alarming function reliability is low. It includes the casing and sets up in the casing and can the pivoted worm wheel, and one side of worm wheel can be dismantled and be connected with the lock ring, is fixed with sensing element on the casing, and the lock ring lies in the same one side of casing outside the casing and with sensing element position, is equipped with the contact that can trigger sensing element when the worm wheel rotates on the outer peripheral face of lock ring, and casing one side at sensing element place still is connected with the housing, and sensing element all lies in the housing with the lock ring. The abrasion alarm device has the advantages of high abrasion alarm reliability, convenience in installation, capability of being directly matched with the original axle structure and the like.

Description

Automatic adjusting arm with abrasion alarming function

Technical Field

The utility model belongs to car control part field relates to the automatic adjustment arm, especially relates to the automatic adjustment arm of area wearing and tearing alarming function.

Background

The brake drum and the brake pad of the drum brake require a certain clearance, namely a vehicle brake clearance, to be reserved during assembly, but the brake pad is worn after a plurality of times of braking to cause the brake clearance to be larger and larger, so that an automatic adjusting arm is required to be arranged in a brake system to automatically adjust the brake clearance between the brake drum and the brake pad. The adjusting range of the automatic adjusting arm is effective, when the abrasion of the brake block exceeds a limit value, a new brake block needs to be replaced, otherwise, the brake fails and the driving safety is affected. In order to enable a driver to replace the brake pads in time, a wear alarm device needs to be arranged when the brake pads are worn to an extreme value.

Aiming at the automatic adjustment of the brake clearance and the alarm when the abrasion of the brake pad is limited, an automobile brake clearance automatic adjuster with a brake lining abrasion alarm device, which is disclosed by the patent application number 03227352.5, comprises a cam shaft arranged on an S-shaped brake shaft of an automobile, wherein a shell is sleeved on the cam shaft, a worm wheel is arranged in the shell and sleeved on a spline of the cam shaft, shifting rings are arranged at two ends of the worm wheel, the two shifting rings are respectively tightly attached to the end surfaces of the worm wheel through a cover plate to form linkage with the worm wheel, a shifting fork is fixed on one shifting ring, a shifting rod is fixed on the other shifting ring, the shifting rod can be in contact with a microswitch fixed on the shell, and the microswitch is connected with an alarm arranged in a cab; the shell is also internally provided with a small shaft, a worm matched with the worm wheel is fixed on the small shaft, a grooved wheel is also arranged on the small shaft, the end surface of the grooved wheel can be meshed with the clutch sleeve, grooves are respectively arranged on the shifting ring and the grooved wheel, and two ends of the connecting rod are embedded in the grooves.

When the brake clearance is adjusted, the worm drives the worm wheel and the cam shaft to rotate so as to compensate and adjust the brake clearance. In the process of rotation of the worm wheel, the shifting ring and the shifting rod fixed on the shifting ring move synchronously, so that the shifting rod approaches to the microswitch. When the brake pad is worn to the maximum value, the poking rod rotates along with the worm wheel to press the microswitch to enable the microswitch to be connected with an alarm arranged in the cab to give an alarm so as to remind a driver to replace the brake pad. However, the automatic automobile brake clearance adjuster has some disadvantages: after the automatic adjuster is installed on a vehicle, a shell of the adjuster is connected with a brake air chamber, a shifting fork is fixed on an axle and keeps still, a plurality of other mechanisms or parts are usually installed between the brake air chamber and the axle, so that the space is very narrow and tight, the trigger mode of the micro switch is simple, the micro switch is easily touched by other parts in the braking process of the vehicle to cause false alarm, and the abrasion alarm function of the automatic adjuster is low in reliability. To address this problem, the conventional approach of those skilled in the art is to select a component with higher precision or a special trigger mode to replace the micro switch, such as magnetic induction type, capacitance type, etc.

Disclosure of Invention

The utility model aims at the above-mentioned problem that prior art exists, provide the automatic adjustment arm of taking wearing and tearing alarming function, solved the technical problem that the reliability is low.

The purpose of the utility model can be realized by the following technical proposal:

take wearing and tearing alarming function's automatic adjustment arm, including the casing and set up in the casing and can the pivoted worm wheel, one side of worm wheel can be dismantled and is connected with the lock ring, is fixed with sensing element on the casing, its characterized in that, the lock ring be located the casing outside and with sensing element be located same one side of casing, be equipped with on the outer peripheral face of lock ring and can trigger sensing element's contact when the worm wheel rotates, casing one side at sensing element place still is connected with the housing, sensing element and lock ring all are located the housing.

During assembly, the locking ring is connected with the worm wheel to enable the locking ring to be located outside the shell, the contact and the sensing element are ensured to form the same angle which the worm wheel needs to rotate when the brake disc is abraded to the limit, and the worm wheel in the automatic adjusting arm is connected with a cam shaft in the braking system. The brake pads are abraded, the automatic adjusting arm automatically adjusts the braking gap, the worm wheel drives the cam shaft to rotate by an angle corresponding to the abrasion amount of the brake pads, and the contact on the locking ring also rotates by the same angle by virtue of the worm wheel, so that the contact approaches to the sensing element. The contact head is continuously close to the sensing element along with the gradual increase of the abrasion loss of the brake block. When the brake block is worn to the limit value, the worm wheel just drives the contact to move to the position of the sensing element to trigger alarm.

The automatic adjusting arm arranges the sensing element and the contact for triggering the sensing element at the same side of the shell, so that the sensing element and the contact can be isolated by connecting the shell on the shell, the matching of the sensing element and the contact can not be interfered by other parts in a vehicle braking system, and the reliability of abrasion alarm is well improved. And, because the induction component and the contact are arranged on the same side of the shell, the automatic adjusting arm can be conveniently installed without being limited by narrow space.

In the automatic adjusting arm with the wear alarm function, the housing comprises a cover body in a cover-shaped structure and a convex part protruding out of the outer peripheral surface of the cover body along the radial direction, the convex part is provided with an accommodating cavity communicated with the inner cavity of the cover body, the locking ring is positioned in the cover body, the sensing element is positioned in the accommodating cavity and is provided with a sensing part, and the sensing part is positioned in the cover body.

The lock ring is located the lid internally, and sensing element's response position is located the lid internally, and sensing element's other positions then are completely cut off and are holding the intracavity, make contact and sensing element cooperation less that the interference that receives, have further improved the reliability that the wearing and tearing was reported to the police.

In the automatic adjusting arm with the abrasion alarming function, one side of the shell where the sensing element is located is provided with the annular bulge, the outer peripheral surface of the opening part of the annular bulge is provided with the flange, the housing is made of plastics, the inner peripheral surface of the cover body is provided with the annular groove, and the flange is clamped into the annular groove.

The housing is made of plastic and has elasticity, so that the cover body can be connected to one side of the housing where the sensing element is located in a mode that the flange is clamped into the ring groove, the matching between the sensing element and the contact can be ensured not to be interfered by the outside, and the reliability of abrasion alarm is improved.

In the automatic adjusting arm with the wear warning function, the flange is provided with an initial position mark.

The flange is provided with an initial position mark corresponding to the initial angle of the contact, and the contact of the locking ring is adjusted to the initial position mark after a new brake pad is replaced. The initial angle of the contact and the induction element can be rapidly and accurately determined by the arrangement, the reliability of abrasion alarm is ensured, and the operation of maintenance personnel is facilitated.

In the automatic adjusting arm with the abrasion alarming function, the extension sleeve is fixed on one side of the worm wheel, the extension sleeve extends out of one side of the shell where the sensing element is located, and the locking ring is detachably connected to the end part of the extension sleeve.

The fixed cover that extends in one side of worm wheel, extend the cover and stretch out outside the casing one side at induction element place, set up the lock ring into can dismantle the tip of connecting in extending the cover, when adjusting the initial position of contact, just need not involve the worm wheel like this, improved initial position regulation's convenience well, make things convenient for maintenance personal to operate.

In the automatic adjusting arm with the abrasion alarming function, the inner wall of the hole opening of the central hole far away from the worm wheel on the locking ring is provided with the blocking edge, one side of the shell where the sensing element is located is provided with the installation plane vertical to the axis of the worm wheel, the sensing element is fixed on the installation plane, the side surface of the blocking edge close to the worm wheel is parallel to the installation plane, and the blocking edge abuts against the end part of the extension sleeve.

The baffle edge is abutted against one end part of the round sleeve body extending out of the shell, so that the accurate matching of the contact and the induction element can be ensured, and the product reliability is improved: firstly, the locking ring is prevented from deflecting when being connected to the round sleeve body; and secondly, the condition that the contact and the induction element form partial induction or cannot be induced is ensured to not occur.

In the automatic adjusting arm with the abrasion alarming function, the locking ring is provided with a fracture which enables the locking ring to be of a discontinuous annular structure, the peripheral surface of the locking ring is provided with a convex block divided into two halves by the fracture, a locking hole is formed in one half of the convex block, and a locking screw which penetrates through the other convex block from outside and is in threaded connection with the locking hole is arranged on the locking ring.

Tightening the locking screw to enable the locking ring to be tightened from the fracture, so that the locking ring and the extension sleeve are fixed together; when the locking screw is unscrewed, the locking ring can be loosened from the fracture, so that the locking ring and the extension sleeve only remain in a sleeving relation, and a maintenance worker can rotate the locking ring to adjust the initial position of the contact. Through fracture and locking screw's setting for the lock ring can be connected in the extension with the detachable mode and sheathe in, and still need not pull down the lock ring from extending sheathe in when the initial position of adjusting the contact, not only makes operational reliability high, makes the operation more convenient simultaneously again.

In the automatic adjusting arm with the abrasion alarming function, as another technical scheme, a plurality of first holes are formed in the outer peripheral surface of the end portion of the extending sleeve, a plurality of second holes are correspondingly formed in the inner peripheral surface of the locking ring, springs and steel balls are arranged in the second holes, and the steel balls are partially embedded into the corresponding first holes under the elastic force of the springs.

Under normal conditions, the lock ring does not receive the exogenic action, and the effect that extends the cover and pass through the steel ball with the lock ring forms the linkage relation and makes the lock ring can rotate along with extending cover and worm wheel together. When a new brake piece is replaced, a maintenance person applies rotating force to the locking ring, so that the steel ball is extruded and retracted to enable the locking ring to be rotated. And after the maintenance personnel rotate the locking ring until the contact is positioned at the initial position mark, the maintenance personnel loosen the hand, and the steel ball is partially embedded into the first hole corresponding to the current position under the action of the elastic force of the spring again.

In the automatic adjusting arm with the abrasion alarming function, the center of one end, far away from the housing, of the worm wheel is provided with the spline hole, the center of one end, close to the housing, of the worm wheel is provided with the cavity which is coaxial with the spline hole, the inner diameter of the cavity is larger than the maximum aperture of the spline hole, and the extension sleeve is inserted into the cavity and fixed with the worm wheel.

This automatic adjustment arm sets up the lock ring into the regulation that can dismantle the connection and realize contact initial position for extend the cover and can be in order to insert the cavity and utilize welding or interference fit's mode directly to form the linkage together with the worm wheel is fixed.

In the automatic adjusting arm with the abrasion alarming function, as another technical scheme, the worm wheel and the extension sleeve are of an integrated structure. When the worm wheel is machined, a corresponding structure can be directly machined on one side of the worm wheel to be used as an extension sleeve.

Compared with the prior art, the automatic adjusting arm with the abrasion alarming function arranges the locking ring with the contact and the induction element at the same side of the shell, so that the locking ring and the induction element can be isolated from other parts in a braking system through the connecting cover shell, the possibility that the induction element is triggered by mistake to alarm is avoided, and the reliability of abrasion alarming is improved. The locking ring and the sensing element are arranged on the same side of the shell, so that the automatic adjusting arm is more convenient to mount, and because an included angle relationship is formed between the surface where the shifting lever is located and the surface where the microswitch is located in the prior art, the problem that the matching is not in place due to the included angle between the surfaces is not needed to be considered, and the problem of yielding of other parts at the included angle in the mounting process is solved.

In addition, the lock ring adopts the detachable mode to connect and sheathes in extending for this automatic adjustment arm only need loosen the initial position that the lock ring adjusted the contact, and the setting of initial position mark makes the regulation of contact become more convenient again in the cooperation simultaneously. And, because lock ring and inductive element are located same one side of casing, and the lock ring is driven by the worm wheel and is rotated, need not consider in the axle other spare parts need give way or need set up the structure scheduling problem that links with the lock ring on the axle internals when the installation for this adjustment arm can directly dispose to current axle structural use, need not the host computer factory to change the axle structure and come the cooperation adjustment arm.

Drawings

FIG. 1 is a longitudinal cross-sectional view of a first embodiment of the present automatic adjusting arm with wear warning function.

Fig. 2 is a schematic diagram of a first embodiment of the automatic adjusting arm with the wear warning function.

Fig. 3 is an exploded view of the first embodiment of the automatic adjusting arm with a wear warning function.

Fig. 4 is a schematic view of the locking ring and the sensing element of the automatic adjusting arm with the wear warning function when they are located in the housing.

FIG. 5 is an exploded view of the locking ring according to one embodiment.

FIG. 6 is a cross-sectional view and a partial enlargement of the cover and the housing according to the first embodiment.

FIG. 7 is a schematic diagram illustrating the positions of the contact and the sensing element when the brake pad is not worn according to the first embodiment.

FIG. 8 is a schematic diagram of the positions of the contact and the sensing element when the brake pad is worn to an extreme value according to the first embodiment.

Fig. 9 is a schematic position diagram of the contact and the sensing element when the brake pad is not worn in the second embodiment.

In the figure, 1, a housing; 1a, a mounting plane; 1b, an annular bulge; 1b1, flange; 1b11, initial position marker; 2. a worm gear; 2a, a spline hole; 2b, a concave cavity; 3. an extension sleeve; 4. an inductive element; 4a, a sensing part; 5. a locking ring; 5a, blocking edges; 5b, breaking; 5c, a bump; 5d, a block-shaped positioning part; 6. a contact; 7. a housing; 7a, a cover body; 7a1, ring groove; 7a2, anti-slip teeth; 7b, a convex part; 7b1, accommodating cavity; 7b2, outlet hole; 8. locking the screw; 9. a worm; 10. and controlling the arm.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1, the automatic adjusting arm with a wear warning function includes a housing 1 and a worm wheel 2 disposed in the housing 1 and capable of rotating, a worm 9 engaged with the worm wheel 2 is disposed in the housing 1, and a control arm 10 is disposed on one side of the housing 1 corresponding to one side of the worm wheel 2. During the use, fix control arm 10 on the axle, automatic adjustment arm's casing 1 can rotate around control arm 10, and worm wheel 2 is equipped with splined hole 2a corresponding control arm 10's one end center, and the one end of camshaft area spline in the braking system passes the splined hole 2a in worm wheel 2 center and makes both form the linkage, and this automatic adjustment arm adjusts the theory of operation in braking clearance is the same with prior art, and here is no longer repeated.

As shown in fig. 1, 2 and 3, a locking ring 5 is detachably connected to the other side of the worm wheel 2, in fact, an extension sleeve 3 is arranged at the other side of the worm wheel 2 in the housing 1, the extension sleeve 3 is coaxially arranged with the worm wheel 2 and forms a linkage relation with the worm wheel 2, and the locking ring 5 is detachably connected to the end of the extension sleeve 3. Particularly, the other end of worm wheel 2 is equipped with cavity 2b, and cavity 2b sets up with splined hole 2a coaxial line, and the internal diameter of cavity 2b is greater than the biggest external diameter of splined hole 2a, and the one end of extending cover 3 inserts in cavity 2b and fixed mutually with worm wheel 2, and it is fixed mutually with worm wheel 2 specifically to extend ways such as cover 3 specifically can adopt welding, interference fit. The extension sleeve 3 extends out of one side of the housing 1, wherein the side of the housing 1 where the control arm 10 is located is opposite to the side of the housing 1 where the extension sleeve 3 extends out. The shell 1 is fixed with a sensing element 4, the sensing element 4 is positioned on one side of the shell 1, which extends out of the extension sleeve 3, namely, the locking ring 5 and the sensing element 4 are arranged on the same side of the shell 1, and the outer peripheral surface of the locking ring 5 is provided with a contact 6 which can trigger the sensing element 4 when the worm wheel 2 rotates. The shell 7 is further connected to one side of the shell 1 where the sensing element 4 is located, and the sensing element 4 and the locking ring 5 are located in the shell 7.

Contact 6 protrusion sets up on the outer peripheral face of lock ring 5, and contact 6 and lock ring 5 both can be split type structure or integral type structure, and split type structure in this embodiment has cubic location portion 5d at the outer peripheral face of lock ring 5, is equipped with the constant head tank on cubic location portion 5d, and contact 6 inlays in the constant head tank. The sensing element 4 is electrically connected with an alarm unit arranged in a vehicle cab, the alarm unit can be a buzzer or a signal indicator lamp and the like, the sensing element 4 can be a proximity switch, and when the contact 6 rotates to be positioned below a sensing surface of the proximity switch, the proximity switch is connected with a circuit to enable the alarm unit to give an alarm; or the sensing element 4 can also be a microswitch, and when the contact 6 rotates to press down a button or an elastic sheet on the microswitch, the microswitch connects a circuit to enable the alarm unit to give an alarm.

As shown in fig. 3, 4 and 6, the cover 7 includes a cover body 7a having a cover-like structure and a protrusion 7b protruding from the outer peripheral surface of the cover body 7a in the radial direction, the protrusion 7b is provided with an accommodating cavity 7b1 communicating with the inner cavity of the cover body 7a, the locking ring 5 is located in the cover body 7a, the sensing element 4 is located in the accommodating cavity 7b1, the sensing element 4 has a sensing portion 4a, and the sensing portion 4a is located in the cover body 7 a. The side of the shell 1 where the inductive element 4 is located is provided with a mounting plane 1a, the mounting plane 1a is perpendicular to the axis of the worm wheel 2, and the inductive element 4 is fixed on the mounting plane 1 a. The mounting plane 1a is provided with an annular bulge 1b, the outer peripheral surface of the opening part of the annular bulge 1b is provided with a flange 1b1, the housing 7 is made of plastics, the inner peripheral surface of the cover body 7a is provided with a ring groove 7a1, the flange 1b1 is clamped into the ring groove 7a1 through the self elasticity of the housing 7, the surface of the flange 1b1, which is close to the cam, is abutted against the groove wall on one side of the ring groove 7a1, the abutted part is an inclined surface, and the inclined surface is mainly used for guiding the housing 7 when being detached. The sensing element 4 is arranged to be a block-shaped structure, the accommodating cavity 7b1 is matched with the sensing element 4 in shape, and a plurality of clamping strips abutted against the side wall of the sensing element 4 are arranged on the cavity walls of two parallel sides of the accommodating cavity 7b 1. The side of the convex part 7b is provided with a wire outlet hole 7b2 communicated with the accommodating cavity 7b1, and a wire connected with the induction element 4 is led out from the wire outlet hole 7b 2. The outer peripheral surface of the cover body 7a is also provided with a plurality of anti-skid teeth 7a2 for increasing the friction force during disassembly.

As shown in fig. 1 and 5, the inner wall of the central hole opening of the locking ring 5 far away from the worm wheel 2 is provided with a blocking edge 5a, the blocking edge 5a is annular, the surface of the blocking edge 5a facing the housing 1 is parallel to the installation plane 1a, and the blocking edge 5a abuts against the end part of the extension sleeve 3. The locking ring 5 is provided with a fracture 5b which enables the locking ring to be in a discontinuous annular structure, the peripheral surface of the locking ring 5 is provided with a convex block 5c divided into two halves by the fracture 5b, wherein a locking hole is arranged on the half convex block 5c, and a locking screw 8 which penetrates through the other convex block 5c from the outside and is connected in the locking hole in a threaded manner is arranged on the locking ring 5. The locking ring 5 is sleeved on the extension sleeve 3, and the end part of the extension sleeve 3 is abutted against the blocking edge 5a on the locking ring 5, so that the accurate matching of the contact 6 and the induction element 4 can be ensured.

During initial installation, the locking ring 5 is sleeved on the end part of the extension sleeve 3, the position of the contact 6 on the locking ring 5 is adjusted to ensure that the contact 6 and the sensing element 4 form the same angle which the worm wheel 2 needs to rotate when the brake block is worn to the limit value, and then the locking screw 8 is screwed to enable the locking ring 5 to be tightened from the fracture 5b and fixed with the extension sleeve 3. As shown in fig. 3 and 7, in order to quickly and accurately adjust the contact 6 in position, an initial position mark 1b11 may be provided on the flange 1b1, which forms the same angle with the sensing element 4 as the worm wheel 2 must rotate when the brake pads are worn to a limit value, so that the desired angle between the contact 6 and the sensing element 4 can be ensured by rotating the lock ring 5 until the contact 6 is located at the initial position mark 1b 11. In this embodiment, the initial position mark 1b11 is specifically a notch on the flange 1b1, the initial position mark 1b11 is located at the right side of the sensing element 4, and the worm wheel 2 drives the locking ring 5 to rotate clockwise when the brake pad is worn.

When the brake pad is worn, the automatic adjusting arm can automatically adjust the brake clearance, so that the worm wheel 2 in the shell 1 drives the cam shaft to rotate by an angle corresponding to the wear amount of the brake pad. The locking ring 5 is fixed with the extension sleeve 3 after being locked by the locking screw 8, and the extension sleeve 3 is fixed with the worm wheel 2, so that the locking ring 5 can rotate by the same angle as the worm wheel 2, and the contact 6 on the locking ring 5 is close to the sensing element 4. As the amount of pad wear increases, the contact 6 moves closer to the sensing element 4. As shown in fig. 8, when the brake pad is worn to the extreme, the contact 6 just moves to the position of the sensing element 4 along with the worm wheel 2 to trigger an alarm. Maintenance personnel carry out the change of braking piece according to reporting to the police, after changing new braking piece, only need to unscrew locking screw 8 and loosen locking ring 5 from fracture 5b department, then rotate locking ring 5 to contact 6 in initial position mark 1b11 department and retighten locking screw 8 can.

According to the automatic adjusting arm, the sensing element 4 and the contact 6 for triggering the sensing element 4 are arranged on the same side of the shell 1, so that the sensing element 4 and the contact 6 can be isolated by connecting the shell 7 on the shell 1, the matching of the sensing element 4 and the contact 6 can not be interfered by other parts in a vehicle braking system, and the reliability of abrasion alarming is well improved. And, because the sensing element 4 and the contact 6 are arranged on the same side of the housing 1, the automatic adjusting arm can be conveniently installed without being limited by a narrow space.

Example two

The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in the present embodiment, as shown in fig. 9, the initial position mark 1b11 is located at the left side of the sensing element 4, and the worm wheel 2 drives the locking ring 5 to rotate in the counterclockwise direction when the brake pad is worn.

EXAMPLE III

The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, the outer peripheral surface of the end of the extension sleeve 3 is provided with a plurality of first holes, the inner peripheral surface of the locking ring 5 is correspondingly provided with a plurality of second holes, springs and steel balls are arranged in the second holes, and the steel balls are partially embedded into the corresponding first holes under the elastic force of the springs.

Under normal conditions, the lock ring 5 does not receive the exogenic action, and the effect that extends cover 3 and lock ring 5 through the steel ball forms the linkage relation and makes lock ring 5 can rotate with worm wheel 2 along with extending cover 3. When a new brake shoe is replaced, a maintenance person applies a rotational force to the lock ring 5, so that the steel ball is pressed and retracted to rotate the lock ring 5. After the maintenance personnel rotates the locking ring 5 until the contact 6 is positioned at the initial position mark 1b11, the maintenance personnel releases the hand, and the steel ball is partially embedded into the first hole corresponding to the current position under the action of the elastic force of the spring again.

Example four

The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in the present embodiment, the extension sleeve 3 and the worm wheel 2 are of an integral structure.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (10)

1. Take wearing and tearing alarming function's automatic adjustment arm, including casing (1) and set up in casing (1) and worm wheel (2) that can rotate, one side of worm wheel (2) can be dismantled and be connected with lock ring (5), is fixed with sensing element (4) on casing (1), its characterized in that, lock ring (5) be located casing (1) outside and arrange in the same one side of casing (1) with sensing element (4), be equipped with on the outer peripheral face of lock ring (5) and can trigger contact (6) of sensing element (4) when worm wheel (2) rotate, casing (1) one side at sensing element (4) place still is connected with housing (7), sensing element (4) all are located housing (7) with lock ring (5).

2. The automatic adjusting arm with the wear warning function according to claim 1, wherein the housing (7) comprises a cover body (7a) having a cover-like structure and a protrusion (7b) radially protruding from the outer peripheral surface of the cover body (7a), the protrusion (7b) is provided with a receiving cavity (7b1) communicated with the inner cavity of the cover body (7a), the locking ring (5) is located in the cover body (7a), the sensing element (4) is located in the receiving cavity (7b1), the sensing element (4) is provided with a sensing portion (4a), and the sensing portion (4a) is located in the cover body (7 a).

3. The automatic adjusting arm with the wear warning function according to claim 2, characterized in that the sensing element (4) is located on one side of the housing (1) and has an annular protrusion (1b), the outer peripheral surface of the opening of the annular protrusion (1b) has a flange (1b1), the cover (7) is made of plastic, the inner peripheral surface of the cover body (7a) is provided with a ring groove (7a1), and the flange (1b1) is clamped into the ring groove (7a 1).

4. The automatic adjusting arm with wear warning function according to claim 3, characterized in that the flange (1b1) is provided with an initial position mark (1b 11).

5. The automatic adjusting arm with the wear warning function according to claim 1, 2, 3 or 4, characterized in that an extension sleeve (3) is fixed on one side of the worm wheel (2), the extension sleeve (3) extends out of one side of the housing (1) where the sensing element (4) is located, and the locking ring (5) is detachably connected to the end of the extension sleeve (3).

6. The automatic adjusting arm with the abrasion warning function according to claim 5, characterized in that the inner wall of the hole of the central hole of the locking ring (5) far away from the worm wheel (2) is provided with a blocking edge (5a), one side of the shell (1) where the sensing element (4) is located is provided with a mounting plane (1a) perpendicular to the axis of the worm wheel (2), the sensing element (4) is fixed on the mounting plane (1a), the side surface of the blocking edge (5a) close to the worm wheel (2) is parallel to the mounting plane (1a), and the blocking edge (5a) abuts against the end of the extension sleeve (3).

7. The automatic adjusting arm with the wear warning function according to claim 6, characterized in that the locking ring (5) has a fracture (5b) which makes the locking ring have a discontinuous annular structure, the outer circumferential surface of the locking ring (5) has a projection (5c) divided into two halves by the fracture (5b), wherein a locking hole is arranged on one half of the projection (5c), and the locking ring (5) is provided with a locking screw (8) which passes through the other projection (5c) from the outside and is in threaded connection with the locking hole.

8. The automatic adjusting arm with the wear warning function according to claim 5, wherein the outer peripheral surface of the end of the extension sleeve (3) is provided with a plurality of first holes, the inner peripheral surface of the locking ring (5) is correspondingly provided with a plurality of second holes, springs and steel balls are arranged in the second holes, and each steel ball is partially embedded into the corresponding first hole under the elastic force of the spring.

9. The automatic adjusting arm with the abrasion alarming function according to claim 5, wherein a splined hole (2a) is formed in the center of one side, away from the housing (7), of the worm wheel (2), a concave cavity (2b) which is coaxial with the splined hole (2a) is formed in the center of one side, close to the housing (7), of the worm wheel (2), the inner diameter of the concave cavity (2b) is larger than the maximum aperture of the splined hole (2a), and the extension sleeve (3) is inserted into the concave cavity (2b) and fixed with the worm wheel (2).

10. The automatic adjusting arm with the wear warning function according to claim 5, characterized in that the worm wheel (2) and the extension sleeve (3) are of an integral structure.

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