CN105351409B - Drum brake based on heat pipe heat radiation and the vehicles with the brake - Google Patents

Abstract

The present invention relates to a kind of drum brake based on heat pipe heat radiation and with the brake the vehicles.Drum brake mainly includes brake backing plate, left and right brake-shoe is arranged on brake backing plate, back-moving spring is housed between left and right brake-shoe, one friction facing is respectively installed on left and right brake-shoe, friction facing is located inside brake drum, multiple heat pipes are separately installed with two brake-shoes, there is the conduit corresponding with the heat pipe quantity on brake backing plate, heating tube, which moves radially, to be used；The heat pipe has bringing-up section and condensation segment, and bringing-up section is connected with brake-shoe, and condensation segment is located at the outside of brake drum, and the heat of brake-shoe is oriented to condensation segment by bringing-up section.The present invention increases radiating heat pipe by the improvement on existing drum-like brake structure, makes it have preferable radiating effect, ensure that the reliability of brake.

Description

Drum brake based on heat pipe heat dissipation and vehicle with the brake

technical field

The invention belongs to the technical field related to thermal energy and vehicle engineering, and in particular relates to a drum brake based on heat pipe heat dissipation and a vehicle with the brake.

Background technique

Drum brakes are also called block brakes, and the braking effect is achieved by pressing the brake blocks on the brake wheels.

A typical drum brake is mainly composed of a base plate, a brake drum, a brake shoe, a wheel cylinder (brake cylinder), a return spring, a positioning pin and other components. The bottom plate is installed on the fixed position of the axle, and it is fixed. There are brake shoes and return springs on it. Each drum has a pair of brake shoes, and there are friction linings on the brake shoes. The brake drum is installed on the wheel hub and rotates with the wheel. It is made of a certain amount of cast iron and shaped like a drum. When braking, the wheel cylinder piston pushes the brake shoe to press the brake drum, and the brake drum is decelerated by friction, forcing the wheel to stop rotating.

The currently used drum brakes have poor heat dissipation performance, so a large amount of heat will accumulate during the braking process, making the brake pads and drums prone to extremely complex deformations under the influence of high temperatures, and prone to brake fading and chattering Phenomenon, resulting in a decrease in braking efficiency.

At present, water spraying is commonly used for auxiliary heat dissipation, and water spraying heat dissipation is likely to cause deformation or cracks of the brake drum due to excessive temperature difference, and the water used for heat dissipation penetrates into the gap between the friction lining and the brake drum, resulting in a decrease in braking efficiency . In addition, the vehicle will carry a water tank, and water should be added regularly, which is inconvenient to use. If the water is not added in time, it will also bring potential safety hazards.

In the prior art, there have been some studies on strengthening the heat dissipation of drum brakes. For example, the Chinese patent literature with the application number 2014203376074 records a composite brake drum, which mainly includes a heat-resistant steel shell, which is cast from heat-resistant steel, and its inner wall is equipped with several brake drums of the same shape. And arc-shaped wear-resistant lining, wear-resistant lining is made of vermicular graphite cast iron or gray cast iron, riveted connection with heat-resistant steel shell through a number of hollow rivets, wear-resistant lining and heat-resistant steel shell in the corresponding position Positioning grooves are respectively opened, and positioning keys are pierced in the positioning grooves; the outer wall of the heat-resistant steel shell is provided with reinforcing ribs and a number of cooling fins, and the outer edge of the front end of the heat-resistant steel shell is provided with a number of cooling holes.

The scheme adopts a double-layer composite structure, and the exterior is a heat-resistant steel shell, so the heat dissipation effect is enhanced, and the stability of the braking performance is guaranteed to a certain extent. However, the essence of this technical solution is to directly open a hole on the brake drum to induce air, and the area exposed to the inside and the outside by the opening is limited. It cannot replace the use of a spray water tank to dissipate heat, and can only be used as an auxiliary cooling method. Thereby has determined its limited technical effect essentially.

Another example is that the Chinese patent document with the application number 2015100695908 records an online monitoring and cooling device for brake heat generation of a truck, which mainly consists of brake drums, brake wheel cylinders, return springs, axles, temperature sensors, and half-moon heat pipes. Brake, brake bottom plate, brake shoe, friction lining, brake shoe adjuster, hexagon socket bolts, the internal structure of the half-moon heat pipe radiator is composed of outer wall, inner wall, capillary liquid-absorbing core, and capillary liquid-absorbing core bridge.

The device combines an on-line monitoring device with a heat dissipation device, and utilizes the tube wall to dissipate heat through the heat pipe. However, the heat pipe heating section and condensation section (radiation section) in this device are all located inside the brake drum, and the brake drum is a relatively closed space, and it is difficult to dissipate the internal heat, so the above device cannot realize the braking process. The purpose of dissipating the heat to the outside of the brake drum.

In order to solve the heat dissipation problem of a large amount of heat generated during vehicle braking, a high-efficiency heat dissipation device is required, which should be able to effectively transfer the heat generated inside the brake drum to the outside of the brake drum, so as to achieve good heat dissipation The effect is to ensure that the brakes of the vehicle still have good reliability when the vehicle is under high load.

Contents of the invention

The object of the present invention is to overcome the disadvantages of the prior art and provide a drum brake which uses a heat pipe as a heat conduction element to efficiently discharge the heat generated when the friction lining and the brake drum work. The invention improves the structure of the existing drum brake and adds heat pipes, so that it has a better heat dissipation effect and ensures the reliability of the brake.

In order to achieve the above object, the present invention adopts the following technical solutions:

A drum brake based on heat pipe heat dissipation, including a brake base plate, left and right brake shoes are installed on the brake base plate, a return spring is installed between the left and right brake shoes, and a return spring is installed on each of the left and right brake shoes Friction lining. The friction lining is located inside the brake drum. Multiple heat pipes are respectively installed on the two brake shoes. There are grooves corresponding to the number of heat pipes on the brake bottom plate for the radial movement of the heat pipes;

The heat pipe has a heating section and a condensing section, the heating section is connected to the brake shoe, the condensing section is located outside the brake drum, and the heating section guides the heat of the brake shoe to the condensing section.

Preferably, both brake shoes have blind holes, and the heat pipes are fixedly connected in the blind holes.

Preferably, the gap between the heat pipe and the blind hole is filled with thermally conductive silica gel.

Preferably, multiple fins are installed on the heat pipe, and the fins are located on the condensation section.

Preferably, the axis of the heat pipe does not coincide with the axis of the brake bottom plate, but they are in the same direction.

While providing the above-mentioned drum brake, the present invention also provides a vehicle, which is a motorcycle, and the above-mentioned drum brake is installed on the motorcycle.

While providing the above-mentioned drum brake, the present invention also provides another vehicle, which is a tricycle on which the above-mentioned drum brake is installed.

While providing the above-mentioned drum brake, the present invention also provides a third vehicle, which is an automobile, on which the above-mentioned drum brake is installed.

The beneficial effects of the invention are: the heat pipe is applied to the drum brake system of the automobile, and the heat generated during braking is rapidly transferred from the brake drum by utilizing the advantages of the heat pipe such as high thermal conductivity and flexible environmental adaptability The cooling effect of the heat pipe is enhanced by installing fins in the heat pipe condensing section, which improves the defect that the drum brake itself is difficult to dissipate heat and is prone to thermal decay. The structure is simple and the work is reliable. Multiple heat pipes are assembled together in a separate plug-in structure or welded. Each heat pipe works independently. When a heat pipe has a reduced heat dissipation effect, it can be replaced independently, which effectively reduces the maintenance cost of the equipment.

Description of drawings

Fig. 1 is the assembly schematic diagram of the present invention;

Fig. 2 is a schematic diagram of the back structure of the present invention (wherein one side is not equipped with a heat pipe);

Fig. 3 is a schematic diagram of the overall structure of the present invention;

In the figure: 1. Brake bottom plate, 2. Friction lining, 3. Heat pipe, 4. Channel, 5. Brake shoe, 6. Return spring, 7. Heat pipe cavity to be assembled, 8. Fin, 9. Manufacturing Moving drum, 10, brake drum inner wall.

detailed description

A drum brake based on heat pipe heat dissipation, its structure is shown in Figure 1-3, including a brake base plate 1, the left and right brake shoes 5 are installed on the brake base plate 1, and the left and right brake shoes A return spring 6 is housed between the 5, and a friction lining 2 is respectively installed on the left and right brake shoes 5, and the friction lining 2 is located inside the brake drum 9. There are two heat pipes 3. There are channels 4 corresponding to the number of heat pipes on the brake base plate 1. The channels 4 are divergent as a whole. Tube 3 is used for radial movement.

The heat pipe 3 has a heating section and a condensing section. The heating section is connected to the brake shoe 5 . The condensing section of the heat pipe 3 is located outside the brake drum 9 . The heating section guides the heat of the brake shoe 5 to the condensing section.

As a mounting structure, blind holes (that is, the cavity 7 of the heat pipe to be assembled) can be provided in the two brake shoes 5, and the heating section of the heat pipe 3 is fixedly connected in the blind hole, and between the heat pipe 3 and the blind hole The gaps are filled with thermally conductive silicone. When the plug-in assembly is adopted, the heat pipe 3 is inserted into the brake shoe 5 and fixed with a fixing pin.

As another installation structure, the heat pipe 3 can also be directly welded on the brake shoe 5 .

As a preferred solution, multiple fins 8 can be installed on the heat pipe 3, and the fins 8 are located in the condensation section to enhance the heat dissipation effect.

Wherein, the axis of the heat pipe 3 does not coincide with the axis of the brake bottom plate 1 , but they are in the same direction.

When the brake is working, the braking system applies an outward pulling force to the return spring 6, thereby driving the brake shoe 5 to move outward in the radial direction, so that the friction lining 2 and the inner wall 10 of the brake drum rub against, and the brake After the end, the return spring 6 drives the friction lining 2 to reset. A large amount of heat is generated in this process, which occurs in the closed space inside the brake drum 9 , and before the heat pipe 3 is assembled, the heat is difficult to dissipate.

After the heat pipe 3 is assembled, the heat will heat the heating section of the heat pipe 3 installed on the brake shoe 5, and the medium in the heat pipe evaporates and absorbs heat to become a gas, and flows along the heat pipe to the heat pipe condensation section located outside the brake drum 9. The substance dissipates heat and condenses in the condensing section of the heat pipe 3, becomes a liquid working fluid again, and flows back along the heat pipe 3 to the heating section of the heat pipe located inside the brake drum 9, so as to transfer heat from the inside of the brake drum 9 to the brake drum 9 external, and exudes purpose to the surrounding environment. During this braking process, the heat pipe 3 mounted on the brake shoe moves along the heat pipe brake track 4 on the brake base plate 1 . In order to enhance the heat dissipation effect of the condensing section of the heat pipe, fins 8 are added to the condensing section of the heat pipe exposed to the outside.

The heat pipe mentioned in the present invention is an existing device. The basic principle is to use the phase change process of the medium condensing at the cold end after evaporating at the hot end (that is, to use the latent heat of evaporation and latent heat of condensation of the liquid) to conduct heat quickly. A general heat pipe consists of a shell, a liquid-absorbing core and an end cap, and its thermal conductivity exceeds that of any known metal.

When the heat pipe 3 in the present invention is installed with a blind hole structure, it is very flexible and has extremely high heat conduction efficiency. A single heat pipe 3 can be replaced, which further reduces the use cost, enhances the usability of the overall system, and can greatly reduce the occurrence of braking. possibility of recession.

Claims (5)

1. A drum brake based on heat pipe heat dissipation, including a brake base plate, the left and right brake shoes are installed on the brake base plate, a return spring is installed between the left and right brake shoes, and each of the left and right brake shoes is installed There is a friction lining, and the friction lining is located inside the brake drum. It is characterized in that a plurality of heat pipes are respectively installed on the two brake shoes, and there are grooves corresponding to the number of heat pipes on the brake bottom plate. The heat pipe has a heating section and a condensation section, the heating section is connected to the brake shoe, the condensation section is located outside the brake drum, and the heating section guides the heat of the brake shoe to the condensation section; There are blind holes in the two brake shoes, and the heat pipe is fixedly connected in the blind holes; The gap between the heat pipe and the blind hole is filled with heat-conducting silica gel; A plurality of fins are installed on the heat pipe, and the fins are located on the condensation section. 2. The drum brake according to claim 1, characterized in that the axes of the heat pipes and the brake bottom plate are not coincident but in the same direction. 3. A vehicle, which is a motorcycle, and a drum brake is installed on the motorcycle, characterized in that, the drum brake is the drum brake according to any one of claims 1-2. 4. A vehicle, which is a tricycle, on which a drum brake is installed, characterized in that, the drum brake is the drum brake according to any one of claims 1-2. 5. A vehicle, which is an automobile, on which a drum brake is installed, characterized in that the drum brake is the drum brake according to any one of claims 1-2.