CN212690654U

CN212690654U - Automobile brake shoe wear limit detection mechanism

Info

Publication number: CN212690654U
Application number: CN202021592616.XU
Authority: CN
Inventors: 韩学智; 陈松林
Original assignee: Hefei Sowell Auto Parts Co ltd
Current assignee: Hefei Sowell Auto Parts Co ltd
Priority date: 2020-08-04
Filing date: 2020-08-04
Publication date: 2021-03-12
Anticipated expiration: 2030-08-04

Abstract

The utility model discloses a mechanism for detecting the abrasion limit of a shoe plate of an automobile brake, which is provided with a driving sleeve fixedly arranged on a cam shaft of the brake, wherein a pit is arranged on the outer circumferential surface of the driving sleeve; a fixing ring is sleeved on the driving sleeve in a sliding way, and the fixing ring is fixedly connected with the axle; a radial through hole is arranged on the outer circumferential surface of the fixed ring, a spring switch is fixedly arranged in the radial through hole, and an elastic contact at the front end of the spring switch is propped against the outer circumferential surface of the driving sleeve by virtue of elasticity and can be embedded into a pit in the driving sleeve which rotates at a corresponding position by virtue of elasticity; the trigger switch for detecting the shoe abrasion reaching the limit state is formed by the elastic contact and the concave pit. The utility model is used for car brake shoe wearing and tearing extreme state reports to the police, avoids causing the damage of stopper part and the emergence of trouble, keeps the original structure of camshaft and camshaft sleeve not to change.

Description

Automobile brake shoe wear limit detection mechanism

Technical Field

The utility model relates to an use signal detection mechanism in car braking system, the more specifically car brake shoe abrasion limit detection mechanism that says so.

Background

In an automobile braking system, when a cam shaft of a brake rotates to a limit position and a cam does not have a rising angle, a brake shoe is seriously clamped, the braking force is reduced, the cam shaft cannot return to release the brake by self, so that the brake is dragged and locked, the temperature is sharply increased, bearing lubricating oil is melted, the bearing is ablated, and a traffic accident is caused by poor braking in serious cases.

In the patent application specification with publication number cn201911349149.x, there is disclosed an automobile drum brake with shoe wear limit alarm proposed by the present applicant, which includes a cam, a camshaft, shoes, shoe support pins, rollers, roller shafts, and dust covers; the technical scheme is that an angle sensor is arranged aiming at a cam shaft, the angle sensor is used for detecting the rotating angle of the cam shaft relative to a cam shaft sleeve in a braking state, an alarm circuit is triggered when the angle reaches a set angle limit value, and the alarm circuit gives out an alarm; it is through effective detection, can accurate judgement shoe's wearing and tearing state to send out the warning when shoe wearing and tearing reach extreme condition, the suggestion driver in time overhauls or changes the brake shoe, avoids shoe wearing and tearing to reach the continuation after the extreme condition and uses, has effectively avoided causing the damage of stopper part and the emergence of trouble. The specific technical scheme proposed in the application is as follows: the angle sensor adopts a contact switch: a pit is arranged at a set position on the outer circumferential surface of the camshaft, and an elastic contact is arranged on the inner side wall of the cam shaft sleeve and corresponds to the axial position of the pit; the contact switch is composed of an elastic contact and a pit and is arranged in a power supply loop of the alarm circuit in series; when the rotating angle of the cam shaft relative to the cam shaft sleeve reaches a set angle limit value, the elastic contact is embedded into the concave pit and triggers an alarm circuit; however, the specific implementation of this technical solution requires structural modification to the camshaft and the camshaft sleeve, the installation process is relatively complicated, and it is difficult to avoid positioning errors for extreme positions.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a for avoid above-mentioned prior art not enough, provide an automobile brake shoe abrasion limit detection mechanism for report to the police when automobile brake shoe wearing and tearing reach extreme condition, avoid causing the damage of stopper part and the emergence of trouble, the original structure that keeps camshaft and camshaft sleeve does not change, simplifies the installation, eliminates positioning error.

The utility model discloses a solve technical problem and adopt following technical scheme:

the utility model discloses automobile brake shoe abrasion limit detection mechanism's characteristics have:

the driving sleeve is fixedly arranged on a cam shaft of the brake, and a concave pit is arranged on the outer circumferential surface of the driving sleeve;

the fixing ring is sleeved on the driving sleeve in a sliding way and is fixedly connected with the axle; a radial through hole is formed in the outer circumferential surface of the fixing ring, a spring switch is fixedly arranged in the radial through hole, and an elastic contact at the front end of the spring switch is elastically abutted against the outer circumferential surface of the driving sleeve and can be elastically embedded into a pit in the driving sleeve which rotates at a corresponding position; an external signal wire is led out from the tail part of the spring switch;

the elastic contact installed on the fixed ring and the concave pit in the driving sleeve rotating at the corresponding position are in the same axial position, and the elastic contact and the concave pit form a trigger switch for detecting that the abrasion of the shoe plate reaches the limit state.

The utility model discloses car brake shoe abrasion limit detection mechanism's characteristics also lie in: on the outer side wall of the fixing ring, the position of the central axis of the spring switch is taken as a starting position, and angle scales are arranged on the circumferential surface along the outer side wall of the fixing ring; and pointers are arranged on the outer side wall of the driving sleeve and correspond to the circumferential positions of the centers of the pits, and the abrasion state of the shoe is judged according to the angle scale values on the fixing ring indicated by the pointers.

The utility model discloses car brake shoe abrasion limit detection mechanism's characteristics also lie in: the spring switch is fixedly installed in the radial through hole through threads, and the axial position of the spring switch in the radial through hole can be adjusted through a nut.

The utility model discloses car brake shoe abrasion limit detection mechanism's characteristics also lie in: the driving sleeve is arranged into two sections, namely a front section sleeve and a rear section sleeve; the fixed ring is sleeved on the front section sleeve of the driving sleeve in a sliding manner, and the concave pits are positioned on the outer circumferential surface of the front section sleeve; the rear section sleeve is a fixed sleeve, three radial thread through holes are uniformly formed in the outer circumferential surface of the rear section sleeve, the fastening screws are fastened to the camshaft through the thread through holes, the driving sleeve is fixed on the camshaft, a circle of convex ring is arranged between the front section sleeve and the rear section sleeve of the driving sleeve, and the driving sleeve is axially positioned when being installed by utilizing the limit of the convex ring on the outer side wall of the fixed ring.

Compared with the prior art, the utility model discloses beneficial effect embodies:

the utility model does not need to change the structure of the camshaft and the camshaft sleeve, and has simple structure, convenient installation, accurate positioning and reliable use; and the shoe plate does not need to be replaced after being replaced, and can be recycled.

Drawings

FIG. 1 is a schematic view of the installation form of the present invention;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is an exploded view of the driving sleeve and the fixing ring of the present invention;

reference numbers in the figures: the screw driving device comprises a driving sleeve 1, a front section sleeve 1a, a rear section sleeve 1b, a convex ring 1c, a threaded through hole 1d, a set screw 2 and a sealing ring 3; 4 fixed ring, 4a lug, 5 spring switch, 6 signal lines, 7 pits, 8 angle scales, 9 camshaft, 10 axles and 11 cam.

Detailed Description

Referring to fig. 1, 2 and 3, the automobile brake shoe wear limit detecting mechanism of the present embodiment includes:

a driving sleeve 1 is fixedly installed on a camshaft 9 of the brake, a pit 7 is provided on the outer circumferential surface of the driving sleeve 1, and a cam 11 is fixedly installed at the front end of the camshaft 9.

A fixing ring 4 which is sleeved on the driving sleeve 1 in a sliding way and is fixedly connected with the axle 10; the outer circumferential surface of the fixed ring 4 is provided with a radial through hole, a spring switch 5 is fixedly arranged in the radial through hole, an elastic contact at the front end of the spring switch 5 is elastically abutted against the outer circumferential surface of the driving sleeve 1 and can be elastically embedded into a pit 7 in the driving sleeve 1 which rotates at a corresponding position, and an external signal wire 6 is led out from the tail part of the spring switch 5.

The elastic contact installed on the fixed ring 4 and the concave pit 7 in the driving sleeve 1 rotating at the corresponding position are at the same axial position, and the elastic contact and the concave pit form a trigger switch for detecting that the abrasion of the shoe reaches the limit state.

In specific implementation, the corresponding measures also include:

on the outer side wall of the fixing ring 4, the position of the central axis of the spring switch is taken as a starting position, and an angle scale 8 is arranged on the circumferential surface along the outer side wall of the fixing ring 4;

and pointers are arranged on the outer side wall of the driving sleeve 1 corresponding to the circumferential position of the central point of the pit 7, and the abrasion state of the shoe is judged according to the angle scale value on the fixing ring 4 indicated by the pointers.

For fixing and adjusting the spring switch 5, an internal thread is provided in the radial through hole on the fixing ring 4, the spring switch 5 is provided as an external thread, the spring switch 5 is fixedly mounted in the radial through hole by means of the thread and can be adjusted in its axial position in the radial through hole by means of a nut.

In order to fixedly install the driving sleeve 1 on the camshaft, the driving sleeve 1 is arranged into two sections, namely a front section sleeve 1a and a rear section sleeve 1 b; the fixed ring 4 is sleeved on the front section sleeve 1a of the driving sleeve 1 in a sliding way, and the concave pits 7 are positioned on the outer circumferential surface of the front section sleeve 1 a; the rear section sleeve 1b is a fixed sleeve, three radial thread through holes 1d are uniformly formed in the outer circumferential surface of the rear section sleeve 1b, a set screw 2 is tightly screwed to the camshaft 9 through the thread through holes 1d, so that the driving sleeve 1 is fixed on the camshaft 9, the driving sleeve 1 rotates along with the camshaft 9, a circle of convex ring 1c is arranged between the front section sleeve 1a and the rear section sleeve 1b of the driving sleeve 1, and the driving sleeve 1 is axially positioned when being installed by utilizing the limit of the convex ring 1c on the outer side wall of the fixed ring 4.

In order to fixedly mount the fixing ring 4 on the axle, a pair of lugs 4a are provided on the outer circumferential surface of the fixing ring 4, through holes are provided in the lugs 4a, and bolts are passed through the through holes to fasten the fixing ring 4 on the axle.

The utility model is provided with an acoustic/optical alarm circuit, the signal wire 6 is electrically connected with the acoustic/optical alarm circuit, and the spring switch 5 is used as a trigger switch of the acoustic/optical alarm circuit; when the wearing and tearing of brake shoe reached extreme condition, spring switch 5 was put through because of embedding pit 7, triggered sound/light alarm circuit and sent the warning, and the suggestion user changes the brake shoe, and after the change of accomplishing the film-making shoe, the accessible adjusting arm was transferred back to the initial position with the camshaft and is got into next duty cycle promptly, need not to change the utility model discloses well any other component.

The utility model discloses to semitrailer and truck rear axle, and the vehicle that has long camshaft, the installation is more simple, at first wear drive sleeve and solid fixed ring at the camshaft in proper order, then adopt the bolt with fixed ring fixed mounting on camshaft support, insert the anterior segment cover of drive sleeve in solid fixed ring's inner ring again, install additional between the inner ring of preceding section cover and solid fixed ring and be used for waterproof and dirt-proof sealing washer 3, the pointer is gone up the instruction angle of angle scale 8 to solid fixed ring on the rotation angle adjustment drive of camshaft when according to brake way hoof piece wearing and tearing extreme condition, with the last camshaft of drive sleeve by the set screw fixation afterwards, make the drive sleeve rotate along with the camshaft.

Claims

1. The automobile brake shoe wear limit detection mechanism is characterized by comprising:

the driving sleeve (1) is fixedly arranged on a camshaft (9) of the brake, and a concave pit (7) is arranged on the outer circumferential surface of the driving sleeve (1);

the fixing ring (4) is sleeved on the driving sleeve (1) in a sliding way and is fixedly connected with the axle (10); a radial through hole is formed in the outer circumferential surface of the fixing ring (4), a spring switch (5) is fixedly arranged in the radial through hole, and an elastic contact at the front end of the spring switch (5) is elastically abutted against the outer circumferential surface of the driving sleeve (1) and can be elastically embedded into a pit (7) in the driving sleeve (1) which rotates at a corresponding position; an externally connected signal wire (6) is led out from the tail part of the spring switch (5);

the elastic contact installed on the fixed ring (4) and the pit (7) in the driving sleeve (1) which rotates at the corresponding position are in the same axial position, and the elastic contact and the pit form a trigger switch for detecting that the abrasion of the shoe reaches the limit state.

2. The automotive brake shoe wear limit detection mechanism of claim 1, wherein: on the outer side wall of the fixing ring (4), an angle scale (8) is arranged on the circumferential surface along the outer side wall of the fixing ring (4) by taking the position of the central axis of the spring switch (5) as a starting position; and a pointer is arranged on the outer side wall of the driving sleeve (1) and corresponds to the circumferential position of the center of the pit (7), and the abrasion state of the shoe is judged according to an angle scale value on the fixing ring indicated by the pointer.

3. The automotive brake shoe wear limit detection mechanism of claim 1, wherein: the spring switch (5) is fixedly installed in the radial through hole through threads, and the axial position of the spring switch in the radial through hole can be adjusted through a nut.

4. The automotive brake shoe wear limit detection mechanism of claim 1, wherein: the driving sleeve (1) is arranged into two sections, namely a front section sleeve (1a) and a rear section sleeve (1 b); the fixed ring (4) is sleeved on a front section sleeve (1a) of the driving sleeve (1) in a sliding manner, and the concave pits (7) are positioned on the outer circumferential surface of the front section sleeve (1 a); the rear section sleeve (1b) is a fixed sleeve, three radial thread through holes (1d) are uniformly formed in the outer circumferential surface of the rear section sleeve (1b), a tacking screw (2) is tacked to the camshaft (9) through the thread through holes (1d), so that the driving sleeve (1) is fixed on the camshaft (9), a circle of convex ring (1c) is arranged between the front section sleeve (1a) and the rear section sleeve (1b) of the driving sleeve (1), and the driving sleeve (1) is axially positioned when being installed by utilizing the limit of the convex ring (1c) on the outer side wall of the fixed ring (4).