CN109488705B - Improved generation brake shoe - Google Patents

Abstract

The invention discloses an improved brake shoe in the technical field of locomotive braking, comprising a brake drum, a brake shoe and a brake chassis, the brake drum is arranged on the periphery of the brake shoe, and the brake shoe includes There are a first brake shoe and a second brake shoe, the first brake shoe and the second brake shoe are symmetrically arranged on the brake chassis, and the top of the first brake shoe and the top of the second brake shoe A cam is arranged between the two sets of cam mechanisms. The invention realizes the parallel movement of the brake shoe as a whole through the two sets of cam mechanisms, so that the friction surface of each area of the friction plate is in synchronous contact with the brake drum, the braking is uniform, the friction effect is good, and the time is prolonged. The service life of the friction plate can be used as a reinforcing plate and can be connected with the slider through the set ratchet tentacles to realize the parallel sliding of the brake shoe. The triangular groove set on the friction plate can effectively avoid sticking to the brake. Delayed braking response due to friction debris on the drum.

Description

An improved brake shoe

technical field

The invention relates to the technical field of locomotive braking, in particular to an improved brake shoe.

Background technique

A brake is a device that has the functions of decelerating, stopping or maintaining a stopped state of moving parts (or moving machinery). The brake is mainly composed of a frame, a braking part and a control device. Some brakes are also equipped with an automatic adjustment device for the gap of the brake parts. In order to reduce the braking torque and structural size, the brakes are usually installed on the high-speed shaft of the equipment, but large equipment with high safety requirements should be installed close to the equipment. on the low-speed shaft of the working part.

The general working principle of the braking system is to use the mutual friction between the non-rotating element connected to the body (or frame) and the rotating element connected to the wheel (or drive shaft) to prevent the rotation or tendency of the wheel, generally The brakes apply braking torque to the rotating elements through the fixed elements, so that the rotation angular velocity of the latter is reduced. All brakes that use the friction between the fixed element and the working surface of the rotating element to generate braking torque are called friction brakes. Among the brakes for vehicles, there is a type of brake that uses a shoe-opening drum brake. The shoe-opening mechanism brake is mainly divided into two categories: one is mechanical, and the most commonly used is pneumatic cam mechanism. It is a hydraulic type: it uses a hydraulic cylinder to push the piston to open the shoe. The strokes of both ends of the brake shoe are equal, so that the brake shoe rotates along the support point under the action of the other end being connected to the support shaft, so that the brake pad on the brake shoe rubs against the brake drum, so as to realize In the braking of the vehicle, because one end of the brake shoe in the brake of the shoe opening mechanism is first opened by the action of the pneumatic cam mechanism, the brake pad close to the end is first rubbed with the brake drum, and the brake is applied for a long time. The friction pads wear unevenly, resulting in poor braking effect of the brake, short replacement cycle of the friction pads, and greatly increased brake maintenance costs. The above problems are especially obvious for large vehicles. The present invention designs an improved brake shoe to solve the above problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to propose an improved brake shoe, so as to solve the problem in the above-mentioned background art that one end of the brake shoe in the brake of the shoe opening mechanism is first opened by the action of the pneumatic cam mechanism, so that the position close to the end is opened first. The brake pads first rub against the brake drum, and the brake pads wear unevenly for a long time, resulting in poor braking effect of the brake, short replacement cycle of the friction pads, and greatly increased brake maintenance costs. For large vehicles , the above problems are particularly obvious problems.

In order to achieve the above purpose, the present invention provides the following technical solutions: an improved brake shoe, comprising a brake drum, a brake shoe and a brake chassis, the brake drum is arranged on the periphery of the brake shoe, the brake The shoe includes a first brake shoe and a second brake shoe, the first brake shoe and the second brake shoe are symmetrically arranged on the brake chassis, and the top of the first brake shoe is connected to the second brake shoe. A cam is arranged between the top of the shoe, a cam is arranged between the bottom of the first brake shoe and the bottom of the second brake shoe, the cam 1 and the cam 2 are arranged on the brake chassis, and the cam 1 and the cam 2 are arranged on the brake chassis. The second cam can drive the first brake shoe and the second brake shoe to open and close, so that both the first brake shoe and the second brake shoe have a friction effect with the inner wall of the brake drum. Both brake shoes are provided with mounting plates, and friction plates are provided on both of the mounting plates.

Preferably, the brake chassis includes a disc body, and the disc body is provided with a chute symmetrically up and down, a slider is slidably clamped in the chute in a left-right symmetrical manner, and a return spring is arranged between the sliders.

Preferably, the sliding block is provided with a threaded hole, and the sliding block and the chute are lubricated.

Preferably, the first brake shoe and the second brake shoe are symmetrically provided with ratchet tentacles, the ratchet tentacles have four groups, and each set of ratchet tentacles is fastened to the slider by screws.

Preferably, the first cam and the second cam are arranged symmetrically, and the first cam and the second cam act on the brake shoe connected thereto synchronously through an external driving device.

Preferably, the friction plate is provided with a triangular groove.

Compared with the prior art, the beneficial effects of the present invention are: the present invention realizes the parallel movement of the brake shoe as a whole through two sets of cam mechanisms, so that the friction surfaces of each area of the friction plate are in synchronous contact with the brake drum, and the braking is uniform. The friction effect is very good, which prolongs the service life of the friction plate. The ratchet-shaped tentacles provided can act as a reinforcing plate and can be connected with the slider to realize the parallel sliding of the brake shoes. Effectively avoid the sluggish braking response caused by friction debris sticking to the brake drum.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the structural representation of the present invention;

Figure 2 is a schematic structural diagram of the brake chassis of the present invention;

Fig. 3 is the structural schematic diagram of the brake shoe of the present invention;

Figure 4 is an A-A side view of the present invention.

In the accompanying drawings, the list of components represented by each number is as follows:

1-brake drum, 2-brake shoe, 201-first brake shoe, 202-second brake shoe, 203-thorn-type tentacle, 3-brake chassis, 301-disc body, 3031-threaded hole, 302-chute, 303-slider, 304-return spring, 4-installation plate, 5-friction plate, 51-trapezoidal groove, 6-cam one, 7-cam two.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1-4, the present invention provides a technical solution: an improved brake shoe, comprising a brake drum 1, a brake shoe 2 and a brake chassis 3, the brake drum 1 is arranged on the brake shoe 2 On the periphery, the brake shoe 2 includes a first brake shoe 201 and a second brake shoe 202. The first brake shoe 201 and the second brake shoe 202 are symmetrically slidingly arranged on the brake chassis 3. The first brake shoe A cam one 6 is provided between the top of the 201 and the top of the second brake shoe 202, a cam two 7 is provided between the bottom of the first brake shoe 201 and the bottom of the second brake shoe 202, and the cam one 6 and the cam two 7 are arranged at the On the brake chassis 3, cam one 6 and cam two 7 can drive the first brake shoe 201 and the second brake shoe 202 to open and close, so that the first brake shoe 201 and the second brake shoe 202 are connected to the brake drum. 1. The inner wall adheres to the friction effect, the first brake shoe 201 and the second brake shoe 202 are both provided with a mounting plate 4, and the mounting plate 4 is provided with a friction plate 5.

Among them, the brake chassis 3 includes a disc body 301, the disc body 301 is provided with a chute 302 symmetrically up and down, a slider 303 is slidably clamped in the chute 302, and a return spring 304 is arranged between the sliders 303. This structure It has the function of realizing the automatic reset of the brake shoe. The slider 303 is provided with a threaded hole 3031 for fixing the ratchet tentacle 203. The slider 303 and the chute 302 are lubricated to reduce friction and facilitate sliding. Both the moving shoe 201 and the second brake shoe 202 are symmetrically provided with ratchet tentacles 203. There are four sets of ratchet tentacles 203, and each set of ratchet tentacles 203 is connected to the slider 303 by screws. This structure can replace the reinforcing plate. , and the slider can be connected to realize the stable sliding of the brake shoe, the cam one 6 and the cam two 7 are symmetrically arranged, and the cam one 6 and the cam two 7 act synchronously on the brake shoe 2 connected to it through the external driving device, which has the function of making the brake shoe 2 connected to it synchronously. The moving shoe synchronously acts on the brake drum. The friction plate 5 is provided with a trapezoidal groove 51, which can press the debris generated by friction into the groove to avoid the brake response delay caused by the friction debris stuck on the brake drum. The problem.

A specific application of this embodiment is as follows: the device is an improved brake shoe, which is mainly suitable for locomotive braking. When the automobile brakes, the foot steps on the brake, and the brake mechanism controls the cam one 6 and the cam two 7 to rotate synchronously, The rotating cam one 6 and the second cam 7 provide the force to push the first brake shoe 201 and the second brake shoe 202 to move, and the first brake shoe 201 and the second brake shoe 202 are forced to approach the brake drum 1 until the The friction plate 5 is attached to the inner wall of the brake drum 1. During this process, the return spring 304 is stretched outward by the tension force, and at the same time accumulates energy. The friction resistance causes the brake drum 1 to decelerate, and the locomotive starts to decelerate and brake. When the brake is not required, the driver releases the brake and the cam mechanism returns to its original position. At the same time, the return spring 304 provides the force for the slider 303 to contract. , the slider 303 drives the brake shoes on both sides to move inward, the friction plate 5 is separated from the brake drum 1, the frictional resistance disappears, and the locomotive braking ends. , so that the structure of the brake shoe is more stable, and the triangular groove 51 arranged on the friction plate 5 can press the debris generated by friction into the groove mouth under the action of pressure, so as to avoid sticking and the debris on the brake drum 1 caused by Brake response lag problem.

In the description of this specification, description with reference to the terms "one embodiment," "example," "specific example," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one aspect of the present invention. in one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above-disclosed preferred embodiments of the present invention are provided only to help illustrate the present invention. The preferred embodiments do not exhaust all the details, nor do they limit the invention to only the described embodiments. Obviously, many modifications and variations are possible in light of the contents of this specification. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is to be limited only by the claims and their full scope and equivalents.

Claims (3)

1. An improved brake shoe, comprising a brake drum (1), a brake shoe (2) and a brake chassis (3), characterized in that: the brake drum (1) is arranged on the brake shoe (2) Peripheral, the brake shoe (2) includes a first brake shoe (201) and a second brake shoe (202), the first brake shoe (201) and the second brake shoe ( 202) Symmetrically slidingly arranged on the brake chassis (3), a cam one (6) is arranged between the top of the first brake shoe (201) and the top of the second brake shoe (202), the first brake shoe (202) A second cam (7) is arranged between the bottom of the moving shoe (201) and the bottom of the second brake shoe (202), and the first cam (6) and the second cam (7) are arranged on the brake chassis (3), so The first cam (6) and the second cam (7) can drive the first brake shoe (201) and the second brake shoe (202) to open and close, so that the first brake shoe (201) and the second brake shoe ( 202) are both in contact with the inner wall of the brake drum (1) for friction, the first brake shoe (201) and the second brake shoe (202) are both provided with a mounting piece (4), and the mounting piece ( 4) Friction plates (5) are provided on both, the brake chassis (3) includes a disc body (301), and the disc body (301) is provided with a chute (302) symmetrically up and down, and the chute ( A slider (303) is slidably clamped in a left-right symmetrical manner in 302), a return spring (304) is arranged between the sliders (303), the first brake shoe (201) and the second brake shoe (202) ) are symmetrically arranged with spine-type tentacles (203), the spine-type tentacles (203) have four groups, each group of spine-type tentacles (203) is fastened and connected to the slider (303) by screws, and the friction plate (5 ) is provided with a triangular groove (51). 2. An improved brake shoe according to claim 1, characterized in that: the slider (303) is provided with a threaded hole (3031), and the slider (303) is connected to the chute (302) Lubricated. 3. An improved brake shoe according to claim 1, characterized in that: the first cam (6) and the second cam (7) are symmetrically arranged, and the first cam (6) and the second cam (7) pass through The external drive acts synchronously on the brake shoes (2) connected to it.

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