CN107606004A - A kind of abrasion alarm mechanism for drum brake assembly - Google Patents

Abstract

The invention provides a wear alarm mechanism for a drum brake assembly, comprising a metal base coaxially opened with a stepped through hole, a wire arranged in the metal base, and a thermosetting material for fixing one end of the wire on the metal base. Plastic cap; the wire is bent into a U shape and set in the thermosetting plastic cap and fixed on the end of the metal base with external threads; the threaded hole and countersink hole for fixing the metal base are processed on the brake shoe, and the center of the friction plate A through hole aligned with the axis of the threaded hole is processed and riveted on the end surface of the brake shoe opposite to the counterbore; the thermosetting plastic cap is placed in the through hole of the friction plate and is slightly lower than the upper end surface of the friction plate. The invention solves the problem of damage to the brake drum due to excessive wear of the friction plate and the problem of material waste due to early replacement, and can also be connected with signal alarm mechanisms such as sound and light to remind the driver to replace the friction plate in time, improving the Driver productivity.

Description

A wear alarm mechanism for drum brake assembly

technical field

The invention relates to the field of a drum brake assembly, in particular to a wear alarm mechanism of the drum brake assembly.

Background technique

At present, the wear of the drum brakes of most medium and heavy commercial vehicles in China is observed through the observation hole of the dust cover. Therefore, it is impossible to quickly and accurately determine whether the friction plate has reached the wear limit. In this way, during the use of the vehicle, the friction plate may be excessively worn, resulting in contact friction between the rivet and the brake drum, and further damage to the inner friction surface of the brake drum. Cause scratches and other damage, which affects the braking performance of the brake and the service life of the brake drum. At the same time, there may be attenuation or loss of braking capacity due to excessive wear of the friction lining, which may cause traffic accidents; it may also occur that the friction lining does not reach the wear. In the case of early replacement due to the limit, the material of the friction lining is wasted. In addition, the driver needs to get out of the car frequently for inspection, which also increases the driver's work intensity to a certain extent.

Contents of the invention

The purpose of the present invention is to provide a drum brake structure with a wear limit alarm mechanism, and the purpose is to solve the problem of material waste caused by excessive wear of the friction plate resulting in brake drum damage or early replacement.

The present invention adopts the following technical solutions: a wear alarm mechanism for a drum brake assembly, comprising a metal base coaxially provided with a stepped through-hole, a wire arranged in the metal base, and a wire for connecting one end of the wire A thermosetting plastic cap fixed on the metal base, the other end of the wire is connected to a plug connector;

One end of the metal base is provided with an external thread, and the other end of the metal base is provided with a hexagonal end;

The wire is bent into a U shape, passes through the stepped through hole, enters the thermosetting plastic cap, and is fixed to the end of the metal base with external threads through the thermosetting plastic cap;

The drum brake assembly mainly includes a brake shoe and a friction plate. A threaded hole and a counterbore for fixing the metal base are processed on the brake shoe. The external thread of the metal base is connected to the The threaded hole is threaded, the center of the friction plate is processed with a through hole aligned with the axis of the threaded hole, and the friction plate is riveted on the end surface of the brake shoe opposite to the counterbore through a rivet;

The thermosetting plastic cap is placed in the through hole of the friction plate and slightly lower than the upper end surface of the friction plate.

The thermosetting plastic cap is 2mm-5mm higher than the upper end surface of the metal base, and the end of the wire placed inside the thermosetting plastic cap is 10-15mm higher than the upper end surface of the metal base.

The threaded hole and the counterbore are located on the outer side of the rib plate of the brake shoe and close to the dust cover; The height is 7mm.

The diameter of the through hole of the friction plate is slightly larger than that of the thermosetting plastic cap.

The wear alarm mechanism also includes a limit assembly, the limit assembly includes a rubber plug body, a holder, and a connecting wire connecting the rubber plug body and the holder, and a wire is provided on the dust cover of the drum brake. piercing hole and holding seat fixing hole, the rubber plug body is set in the wire passing hole, and the holding seat is inserted into the holding seat fixing hole; a central through hole is opened on the rubber plug body, A limiting platform is arranged on the wire, and the limiting platform includes a cylindrical part sleeved on the wire and bosses arranged at both ends of the cylindrical part, and the cylindrical part is clamped in the center At the through hole, the two bosses are respectively located on both sides of the rubber plug.

Both the lead wire passing hole and the holding seat fixing hole are slightly larger than the wear alarm mechanism head and the outer contour size of the plug joint, so as to facilitate the disassembly and assembly of the wear alarm head.

The limiting platform is made of rubber.

The beneficial effect of the present invention is: the present invention does not make changes to the drum brake body, only the brake shoe, friction plate and dust cover can be processed, and the applicability is strong; the present invention can effectively prevent the excessive wear of the friction plate The damage to the brake drum can prevent the adverse effect on the driving safety of the vehicle after the excessive wear of the friction plate; the invention can also be connected with the signal alarm mechanism such as sound and light, so that the driver can detect the alarm signal in the cab and remind the driver The driver can replace the friction plate in time, which reduces the labor intensity of the driver.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the brake shoe assembly of the present invention.

Fig. 2 is a schematic diagram of the wear alarm mechanism of the present invention.

Fig. 3 is a structural schematic diagram of a thermosetting plastic cap and a metal base of the present invention.

Fig. 4 is a schematic diagram of the structure of the dust cover of the present invention.

Fig. 5 is a schematic diagram of the structure of the rubber stopper of the present invention.

Fig. 6 is a schematic diagram of the assembly of the rubber stopper and the dust cover of the present invention.

Fig. 7 is a schematic diagram of the installation structure of the wear alarm mechanism, brake shoe and dust cover of the present invention.

Wherein, reference signs are: among them, 1-brake shoe assembly, 1a-brake shoe, 1b-friction plate, 1c-rivet, 2-dust cover, 3-wearing alarm mechanism, 3a-metal base, 3b -Thermosetting plastic cap, 3c-wire, 3d-plug connector, 3e-limiting platform, 4-rubber plug, 4a-rubber plug body, 4b-holding seat, 4c-connecting wire.

detailed description

In order to illustrate the technical features of the solution more clearly, the solution will be described below through specific implementation modes.

As shown in Figure 2 and Figure 3, the present invention adopts the following technical solutions: a wear alarm mechanism for the drum brake assembly, including a metal base 3a coaxially opened with stepped through holes, a metal base 3a arranged in the metal base 3a Lead wire 3c and thermosetting plastic cap 3b for fixing one end of lead wire 3c on the metal base 3a, the other end of lead wire 3c is connected with a plug connector 3d;

One end of the metal base 3a is provided with an external thread, and the other end of the metal base 3a is provided with a hexagonal end;

The wire 3c is bent into a U shape, passes through the stepped through hole, enters the thermosetting plastic cap 3b, and is fixed to the end of the metal base 3a with external threads through the thermosetting plastic cap 3b;

As shown in Figures 1 and 7, the drum brake assembly 1 mainly includes a brake shoe 1a and a friction plate 1b, and a threaded hole and a counterbore for fixing the metal base 3a are processed on the brake shoe 1a, and the metal base 3a The external thread part of the brake shoe is threadedly connected with the threaded hole, and the center of the friction plate 1b is processed with a through hole aligned with the axis of the threaded hole, and the friction plate 1b is riveted on the end surface of the brake shoe 1a opposite to the countersunk hole through a rivet 1c;

The thermosetting plastic cap 3b is placed in the through hole of the friction plate 1b and slightly lower than the upper end surface of the friction plate 1b.

The thermosetting plastic cap 3b is 2mm-5mm higher than the upper end surface of the metal base 3a, and the end of the wire 3c placed inside the thermosetting plastic cap 3b is 10-15mm higher than the upper end surface of the metal base 3a.

As shown in Figure 4, the threaded hole and the counterbore are located outside the rib plate of the brake shoe 1a and close to the dust cover 2; the bottom surface of the counterbore is close to the brake shoe 1a and the friction plate 1b. The height between joint surfaces is 7mm.

The diameter of the through hole of the friction plate 1b is slightly larger than that of the thermosetting plastic cap 3b.

As shown in Figure 5 and Figure 6, the wear alarm mechanism 3 also includes a limit assembly, the limit assembly includes a rubber plug 4 composed of a rubber plug body 4a and a holder 4b, and a connecting line connecting the rubber plug body 4a and the holder 4b 4c, the dust cover 2 of the drum brake is provided with a wire 3c passing hole and a holder fixing hole, the rubber plug body 4a is set in the wire 3c passing hole, and the holder 4b is inserted into the holder fixing hole; the rubber plug The main body 4a is provided with a central through hole, and the wire 3c is provided with a limiting platform 3e. The limiting platform 3e includes a cylindrical part sleeved on the wire 3c and bosses arranged at both ends of the cylindrical part, and the cylindrical part is clamped on the At the central through hole, the bosses at both ends are respectively located on both sides of the rubber plug 4 .

Both the lead wire passing hole and the holding seat fixing hole are slightly larger than the wear alarm mechanism head and the outer contour size of the plug joint, so as to facilitate the disassembly and assembly of the wear alarm head.

Working process of the present invention:

Initial state: The mechanism is powered on.

Wear state: When the driver brakes, the brake drum gradually approaches the brake shoe 1a and contacts the friction plate 1b. When the friction plate 1b set on the brake shoe 1a wears to the calculated size, it is in the center hole of the friction plate 1b The end of the thermosetting plastic cap 3b contacts and rubs against the brake drum. Because the material strength and hardness of the thermosetting plastic cap 3b and the wire 3c are much lower than that of the brake drum, when the wire 3c is worn by the rotating brake drum, the brake drum still remains No abnormal wear, when the wire 3c has not been completely worn off, the wear alarm mechanism is still in the energized state.

Alarm state: With the continuous feeding of the brake drum, the wire 3c fixed in the thermosetting plastic cap 3b is worn and broken, and the wear alarm mechanism is powered off and alarms. At this time, the system informs the driver of the alarm signal and reminds the driver to perform friction Check and replace slice 1b.

The invention enables the driver to perceive the change of the friction lining at any time through the alarm prompt of the wear alarm mechanism, which not only avoids the damage of the brake drum due to excessive wear of the friction lining, but also avoids the waste of materials caused by replacing the friction lining in advance. It also improves the driver's work efficiency and avoids the occurrence of traffic accidents.

The undescribed technical features of the present invention can be realized by or using the prior art, and will not be repeated here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Those of ordinary skill in the art Changes, modifications, additions or substitutions made within the essential scope of the present invention shall also belong to the protection scope of the present invention.

Claims (7)

1. a kind of abrasion alarm mechanism for drum brake assembly, it is characterised in that offer ladder insertion including coaxial The metab in hole, the wire being arranged in the metab and for described wire one end to be fixed on into the metab On thermosetting plastics cap, the wire other end connects a connection-peg；

Described metab one end is provided with external screw thread, and the metab other end is provided with hexagonal end；

The wire, which is bent into, U-shaped passes the ladder through hole into thermosetting plastics cap and by the thermosetting plastics Cap is fixed on the metab and carries externally threaded end；

The drum brake assembly mainly includes brake-shoe and friction plate, is processed on the brake-shoe for fixing the gold Belong to the screwed hole and counter sink of base, the external thread part of the metab is threadedly coupled with the screwed hole, the friction plate Center is machined with the through hole to be alignd with the screwed hole axle center；

The thermosetting plastics cap is placed in the through hole of the friction plate and the upper surface of slightly below described friction plate.

2. the abrasion alarm mechanism according to claim 1 for drum brake assembly, it is characterised in that the thermosetting Property plastic cap is higher by the metab upper surface 2mm~5mm, the end for the wire being placed in inside the thermosetting plastics cap Head height goes out the 10~15mm of metab upper surface.

3. the abrasion alarm mechanism for drum brake assembly according to claim any one of 1-2, it is characterised in that The screwed hole and the counter sink are located on the outside of the gusset of the brake-shoe and at dust cover；The bottom surface of the counter sink It is 7mm away from the height between the brake-shoe and the friction plate binding face.

4. the abrasion alarm mechanism for drum brake assembly according to claim any one of 1-3, it is characterised in that The through-hole diameter of the friction plate is more bigger than the thermosetting plastics cap size.

5. the abrasion alarm mechanism for drum brake assembly according to claim any one of 1-4, it is characterised in that Also include limit assembly, the limit assembly includes rubber stopper body, keeps seat and the connection rubber stopper body and holding The connecting line of seat, wire punched out is offered on the dust cover of the drum brake and keeps seat fixing hole, the rubber stopper Body is arranged in the wire punched out, and the holding seat is filled in the holding seat fixing hole；On the rubber stopper body Central through hole is offered, limiting stand is provided with the wire, the limiting stand includes the cylindrical portion being set on the wire With the boss for being arranged on the cylindrical portion both ends, the cylindrical portion is fastened at the central through hole, two boss difference Positioned at rubber stopper both sides.

6. the abrasion alarm mechanism for drum brake assembly according to claim any one of 1-5, it is characterised in that The wire punched out and the holding seat fixing hole are all slightly larger than abrasion alarm mechanism head and connection-peg outer profile size.

7. the abrasion alarm mechanism for drum brake assembly according to claim any one of 1-6, it is characterised in that The limiting stand is quality of rubber materials.