CN204985450U - Use heat pipe and radiating drum brake of flabellum - Google Patents

Abstract

The utility model discloses a drum brake using heat pipes and fan blades for heat dissipation, comprising front brake shoes, rear brake shoes, friction plates, brake shoe return springs, brake wheel cylinders, fan blades, heat pipes and support pins; A plurality of heat pipes are arranged at intervals on the front and rear brake shoes and the friction lining; the brake drum body is installed on the outer periphery of the friction lining; the brake drum body is installed on the wheel through the brake drum installation hole; the fan blade is installed on the On the brake drum body; arc-shaped ventilation slots are set on the brake drum body. The utility model embeds a heat pipe array between the brake shoe and the friction plate of the drum brake, and sets fan blades in the brake drum to play the role of a fan in the running process of the vehicle. This structural feature can quickly conduct a large amount of heat generated by the friction between the friction plate and the brake drum to the brake drum chamber through the heat pipe when the vehicle is braking, and take it out to the external environment through the inflowing air in the brake drum chamber. Thereby reducing the temperature of the brake drum and the friction plate, so that the braking performance of the brake is more stable.

Description

Drum brakes with heat pipes and fan blades for heat dissipation

technical field

The utility model relates to a vehicle brake (that is, a brake device), in particular to a rapid heat conduction through a heat pipe, so as to achieve rapid heat dissipation, avoid excessive temperature rise of drum brake components, thermal recession, and cause brake failure. Auto parts technology field.

Background technique

To slow down or even stop a moving car, keep the speed of a downhill car stable, and keep a stopped car still, these functions are collectively called car braking. The brake is a component used in automobile braking to generate a force that hinders the movement or movement tendency of the vehicle. At present, the brakes used in all kinds of automobiles are almost all friction brakes, and the friction brakes used in automobiles can be divided into two categories: drum type and disc type. Among them, the drum brake has high braking efficiency, simple structure and flexible space arrangement, and has been widely used.

The working principle of the automobile drum brake is to use the outer surface of the brake friction plate on the brake shoe and the inner cylindrical surface of the brake drum to prevent the rotation or rotation tendency of the wheel through mutual friction during braking. It can be seen that the process of car braking is the process of converting kinetic energy into frictional heat energy. During the braking process of the car, especially when the car is running at a high altitude for emergency braking or going downhill for a long time under heavy load conditions, friction will produce With a large amount of heat, the instantaneous temperature of the inner surface of the brake drum and the friction lining will rise sharply, reaching a temperature of 300-400°C or even higher. When the temperature of the inner surface of the brake drum and the friction plate is too high, the friction coefficient of the friction plate and the inner surface of the brake drum will drop and fluctuate greatly, thereby greatly weakening the braking performance of the car. Because during the braking process, the friction generated by the friction material and the inner surface of the brake drum can deform the contact surface, tear the adhesion point, and cause the hard point or abrasive debris to produce a plowing effect. The mechanism is related to various parameters of the braking process, material properties, surface morphology and environmental factors. A large number of studies have shown that: for dry friction and boundary friction, under certain pressure conditions, there is a clear functional relationship between the friction coefficient and wear rate and the maximum surface temperature. Moreover, if the friction material is in a high temperature state for a long time, it will cause the brakes of the car to fail, that is, the so-called "thermal recession" phenomenon. In this case, the braking distance of the vehicle will be greatly increased, which is very unfavorable for driving safety. In addition, since the heat cannot be effectively removed in time, the heat is sealed in the annular space between the outer ring of the brake drum and the inner ring of the steel ring, so the temperature of the steel ring will also rise accordingly and be transferred to the tire installed on the steel ring, making If the rubber inner tube is heated for a long time, it will age and reduce the service life. It may even cause a tire blowout and cause a traffic accident.

At present, at home and abroad, the heat resistance and thermal stability of the reinforced materials are mainly used to reduce the thermal degradation of the friction lining. However, the heat-resistant treatment of the material not only increases the cost, but also cannot fundamentally solve the energy accumulation generated during braking. Therefore, the temperature of the friction lining and the brake drum can only be reduced by timely and effectively transferring the large amount of heat generated during the braking process. The heat dissipation and cooling of the existing drum brakes is through water cooling. A water tank with a large capacity is installed on the vehicle and directly sprayed on the outer surface of the brake drum through the pipeline to achieve the purpose of heat dissipation and cooling. Although the use of water cooling can reduce the temperature of the brake drum and the friction lining rapidly, it is easy to cause the deformation of the brake drum and the friction lining, and if water enters and exits between the brake drum and the friction lining, it will easily slip, and Brake "water recession" problems may occur. In addition, in the cold winter, the pipeline of the sprinkler device cannot be used due to freezing, and the sprayed water cannot be recovered and directly sprayed on the road surface, causing localized ice to induce traffic accidents, and the surface of the brake drum is also damaged by the water. Cracks or even broken due to different temperatures, the water spray method cannot fundamentally solve the high temperature in the inner space of the brake drum.

Utility model content

The purpose of the utility model is to solve the difficulty in heat dissipation of the automobile drum brake in the prior art, and provide a drum brake with high heat dissipation efficiency and good reliability using heat pipes and fan blades for heat dissipation.

Aiming at the problem of thermal degradation caused by a large amount of heat generated between the friction plate and the inner surface of the brake drum during braking, which cannot be eliminated in time and effectively. The utility model proposes a drum brake. The drum brake uses heat pipes (with fins) to export a large amount of heat generated by the mutual friction between the friction plate and the brake drum during braking, and at the same time uses ventilation to dissipate heat, so as to achieve the best braking performance. The purpose of heat dissipation and cooling in the tympanic cavity. The utility model has the advantages of compact and simple structure, convenient installation, low cost, low noise, strong heat dissipation capacity, etc., thereby ensuring the safety and reliability of the automobile during braking. At the same time, it also solves the problems caused by the water-cooling method of the above-mentioned middle drum brake, and avoids the waste of water resources.

A heat pipe is a heat transfer element with extremely high thermal conductivity. It consists of a tube shell, a liquid-absorbing core, and an end cap. The shell is a metal tube, and the inner wall is a liquid-absorbing core with a wicking effect. Both ends of the shell are sealed to form a fully enclosed tube body. Before sealing, the tube is evacuated, and then the working liquid (working medium) is injected. After the evaporating end of the heat pipe absorbs heat, the working fluid evaporates into a gas and flows to the condensing end, where it cools and condenses into a liquid and releases heat to the outside of the tube. Due to the wicking effect of the wick, the condensed working fluid passes through the wick It flows back from the condensing end to the evaporating end, and it goes round and round, realizing the rapid transfer of heat. Due to good thermal conductivity, light weight, no noise, no mechanical transmission part, simple structure, and good working condition and effect under weightless conditions, heat pipes are widely used in military industry, petroleum, chemical industry, electronic appliances, machinery, communications, etc. field. However, the current application of heat pipes in automotive brakes is still very rare.

The utility model embeds one end of a certain number of heat pipes into the webs and friction plates on both sides of the brake shoe of the drum brake as the hot end (evaporation end) of the heat pipe; the other end of the heat pipe extends into the brake drum chamber, As the cold end (condensing end), a certain number of fins are installed in the condensing section. When the car is braked, the brake shoes of the drum brake are opened, so that the friction plates linked with the brake shoes through rivets are in close contact with the rotating brake drum, and there is mutual friction between the two, generating a large amount of frictional heat. At the same time, the heat pipe with extremely high thermal conductivity installed inside the friction plate can quickly transfer heat to the condensing section with fins, and through these fins, the heat is transferred to the cooling system with fan blades inside. The heated air is sucked in by the drum, and the heated air flows out of the drum chamber through the vent holes in the brake base plate. Therefore, a large amount of heat generated during braking can be eliminated in time and effectively.

The purpose of this utility model is achieved through the following technical solutions:

A drum brake using heat pipes and fan blades for heat dissipation, including front brake shoes, rear brake shoes, friction plates, brake shoe return springs, brake wheel cylinders, fan blades, heat pipes and support pins; front brake One end of the brake shoe and the rear brake shoe are respectively movably connected to the brake base plate through two support pins, and the other ends of the front brake shoe and the rear brake shoe are respectively connected to the brake wheel cylinder piston through the brake wheel cylinder piston pin. , the brake wheel cylinder piston is set in the brake wheel cylinder; the brake shoe return spring is respectively connected with the front brake shoe and the rear brake shoe; the friction plate is connected to the outer periphery of the front brake shoe and the rear brake shoe; There are multiple heat pipes at intervals between the front brake shoe and the rear brake shoe and the friction plate; the brake drum body is installed on the outer periphery of the friction plate; the brake drum body is installed on the wheel through the brake drum installation hole; the fan blade is installed on the On the main body of the moving drum; on the main body of the brake drum there is an arc-shaped ventilation slot.

In order to further realize the purpose of the utility model, preferably, a plurality of rectangular installation grooves are arranged radially at intervals on the inner side of the friction plate, and through-holes are provided at the corresponding rectangular installation grooves on the webs of the front brake shoe and the rear brake shoe. The heat pipe is a U-shaped heat pipe, and a plurality of heat pipes pass through the through holes on the web of the front brake shoe and the rear brake shoe respectively and are fixed in the rectangular mounting groove of the friction plate.

Preferably, a plurality of arc-shaped semicircular heat pipe installation grooves are arranged at intervals along the circumferential direction on the inner surface of the friction plate, and the webs at the semicircular heat pipe installation grooves of the front brake shoe and the rear brake shoe correspond to the friction plate A plurality of arc-shaped semicircular heat pipe installation grooves are arranged at intervals on the outer surface, and the plurality of heat pipes are respectively arranged in the semicircular heat pipe installation grooves provided on the friction plate and the web plate of the rear brake shoe.

Preferably, a plurality of fins are provided at the cold end of the heat pipe. Preferably, the fins have a thickness of 2-4 mm and are rectangular. The heat pipe and the fins are fixedly connected by pressure riveting or soldering.

Preferably, bolt holes are provided on the front brake shoe and the rear brake shoe, and the front brake shoe and the rear brake shoe are connected to the friction plates through bolts.

Preferably, the tube body material of the heat pipe is copper, its two ends are sealed, and the working fluid filled inside is deionized water, naphthalene or N-methylpyrrolidone.

Preferably, the fan blade is mounted on the brake drum body through the spline fit between the spline teeth and the spline key groove.

There are two design schemes for the arrangement of the hot and cold ends of the heat pipe of the utility model. Option 1, a rectangular groove is formed on the inner surface of the friction plate, and a circular through hole is formed on the web plate of the brake shoe corresponding to the rectangular groove. The bottom of the U-shaped heat pipe is embedded in the rectangular groove of the friction plate, and the two ends protrude through the round holes on the web plate of the brake shoe. The cold end of the heat pipe is consistent with the radial direction of the arc-shaped brake shoe and the friction plate, that is, the cold end is arranged radially; in the second scheme, a semicircular groove is formed on the inner surface of the friction plate along the circumferential direction At the same time, a semicircular groove is formed along the circumferential direction at the corresponding position on the outer edge surface of the brake shoe web. The hot end of the heat pipe is bent into an arc shape and embedded in the circular hole formed by the friction plate and the web of the brake shoe. The cold end of the heat pipe is vertically arranged, that is, the cold end is vertically arranged. The cold ends of both schemes are arranged with a certain number of fins. According to whether it is necessary to increase the heat dissipation area, the two design schemes can be divided into two types: adding fins and not adding fins.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

1) The utility model embeds a heat pipe array between the brake shoe and the friction plate of the drum brake, wherein the heat pipe part in contact with the friction plate is the evaporation section (hot end), and the condensation section (cold end) of the heat pipe extends into the brake drum indoor. At the same time, the utility model installs fan blades with spline grooves in the brake drum through a spline connection, and plays the role of a fan in the running process of the vehicle. This structural feature can quickly conduct a large amount of heat generated by the friction between the friction plate and the brake drum to the brake drum chamber through the heat pipe when the vehicle is braking, and take it out to the external environment through the inflowing air in the brake drum chamber. Thereby reducing the temperature of the brake drum and the friction plate, so that the braking performance of the brake is more stable.

2) The utility model adopts the heat pipe as the heat conduction device, does not need additional auxiliary power source to maintain the operation of the heat pipe, and makes full use of the structure of the existing drum brake, by opening the heat pipe groove or through hole in the friction plate and the brake shoe web , no need to change the overall structure of the drum brake, strong adaptability, stable structure, simple process and low cost. Heat pipes are used as heat transfer elements. Heat pipe is a heat exchange element with extremely high heat transfer efficiency. The heat transfer between cold and hot fluids is realized by the phase change process of evaporation and condensation of the working medium in the heat pipe. Its equivalent thermal conductivity can reach 10 times that of metal. ³ to 10 ⁴ times. Compared with traditional heat dissipation equipment, the heat pipe does not need to consume power, has a small space size, high cooling capacity, and high heat transfer per unit area. As a high-efficiency heat-conducting element, the heat pipe is suitable for heat dissipation under the condition of high heat flux. In addition, the heat pipe also has the characteristics of light weight, no noise, no mechanical transmission part, and simple structure. What the heat pipe shell of the utility model mainly adopts is copper material. Because copper is a common metal with good mechanical properties and a linear thermal expansion coefficient of 17.5*10 ^‐6 /K, copper is selected as the shell material.

3) In the brake drum part of the utility model, fan blades with spline grooves inside are installed through a spline connection. When the brake drum rotates continuously with the movement of the vehicle, the air in the external environment will pass through the ventilation holes on the brake drum. The groove enters the brake drum chamber and returns to the external environment from the cooling groove of the brake base plate, thereby taking away the heat conducted to the brake drum chamber.

4) The heat pipe is U-shaped, and the bottom of the U-shaped heat pipe is embedded in the friction plate with a rectangular groove as the hot end (evaporation section), and the two ends protrude from the brake shoe web with a round hole as Cold end (condensing section). On the one hand, such a heat pipe is very easy to install in the drum brake, which makes installation and disassembly more convenient; on the other hand, the U-shaped bottom of the U-shaped heat pipe is used as the hot end (evaporating section), and the two sides are used as the cold end (condensing section) , which makes heat transfer to the surrounding air more efficient.

5) The utility model arranges a certain number of fins at the cold end of the heat pipe, thereby increasing the heat dissipation area and making the heat transfer to the air more efficiently. In addition, the number of heat pipes and the number and shape of fins can be arranged according to the actual situation of the brake.

6) The inner surface of the friction plate of the utility model is provided with grooves (rectangular grooves or semi-arc grooves), on the one hand, it is beneficial to the arrangement of heat pipes, and on the other hand, it increases its own surface area, which is beneficial to the heat dissipation of the friction plate itself. In addition, the channel can also play a role of guiding heat flow.

7) The utility model adopts a brake drum with built-in fan blades. When the brake rotates with the wheel, the brake drum acts as a fan, which can suck the outside air into the brake drum to exchange heat with the fins of the condensing section of the heat pipe. At the same time, the heated air can be discharged from the brake drum chamber through the ventilation slots and ventilation holes on the brake base plate, so as to play the role of heat dissipation and cooling. And the fan blade used by the brake drum in the utility model is detachable, and is connected by a spline between the fan blade and the brake drum. In this way, the fan blade and the brake drum can be manufactured and processed separately, which not only facilitates processing and installation, but also can be disassembled as required.

8) In the utility model, a material with better thermal conductivity (the thermal conductivity is much higher than that of the brake drum) can be used as the friction plate. Air thermal resistance between. Using a friction plate with better thermal conductivity can transfer a large amount of heat generated by friction between the friction plate and the brake drum to the friction plate, and then transfer it out through the heat pipe embedded in the friction plate, thereby avoiding most of the heat generated by friction. to the brake drum.

Description of drawings

Fig. 1 is the three-dimensional schematic view of the drum brake with the radially arranged cold ends of the heat pipes in Embodiment 1;

Fig. 2 is the front view of Fig. 1;

Fig. 3 is the back view of Fig. 1;

Fig. 4 is the schematic diagram of arrangement of U-shaped heat pipes with fins in Embodiment 1;

5 is a schematic diagram of a brake shoe with a U-shaped heat pipe in Embodiment 1;

Fig. 6 is the explosion diagram of Fig. 5;

7 is a schematic diagram of drum brake friction plates arranged radially at the cold end of the heat pipe in Embodiment 1;

8 is a schematic diagram of a U-shaped heat pipe and a U-shaped heat pipe with fins;

Fig. 9 is a schematic diagram of a drum brake in which the cold ends of the heat pipes are arranged radially but without fins in Embodiment 1;

Fig. 10 is a three-dimensional schematic diagram of a drum brake with vertically arranged cold ends of heat pipes in Embodiment 2;

Fig. 11 is the schematic diagram of the brake shoe of drum brake in embodiment 2;

Fig. 12 is the schematic diagram of drum brake friction plate in embodiment 2;

Fig. 13 is a three-dimensional schematic diagram of a drum brake with vertically arranged cold ends of heat pipes without fins in Embodiment 2;

Fig. 14 is the three-dimensional schematic diagram of the brake drum of embodiment 1 and embodiment 2;

Fig. 15b is the right side view of Fig. 14;

Figure 15a is a sectional view along the A-A direction of Figure 15b;

Fig. 16 is a schematic diagram of the fan blades of Embodiment 1 and Embodiment 2;

The figure shows: brake shoe return spring 1, front brake shoe 2, brake shoe web 3, friction plate 4, rectangular mounting groove 5, brake bottom plate 6, brake wheel cylinder 7, brake wheel cylinder Piston pin 8, brake wheel cylinder piston 9, fin 10, heat pipe 11, friction plate installation hole 12, rear brake shoe 13, support pin 14, arc-shaped installation groove 15, brake bottom plate installation hole 6.1, brake bottom plate Ventilation groove 6.2, brake drum body 16, fan blade 17, brake drum installation hole 18, arc-shaped ventilation groove 19, spline key tooth 20, spline key groove 21.

detailed description

In order to better understand the utility model, the utility model will be further described below in conjunction with the accompanying drawings and examples, but the implementation of the utility model is not limited to this.

Example 1

As shown in Figures 1 to 9 and Figures 14 to 16, a drum brake using heat pipes and fan blades for heat dissipation includes front brake shoes 2, rear brake shoes 13, friction plates 4, and brake shoe return Spring 1, brake wheel cylinder 7, heat pipe 11 and support pin 14; one end of front brake shoe 2 and rear brake shoe 13 are respectively movably connected on the brake base plate 6 by two support pins 14, front brake shoe 2 and the other end of the rear brake shoe 13 are respectively connected to the brake wheel cylinder piston 9 through the brake wheel cylinder piston pin 8, and the brake wheel cylinder piston 9 is arranged in the brake wheel cylinder 7; the brake shoe return spring 1 respectively connected with the front brake shoe 2 and the rear brake shoe 13;

The outer circumference of the front brake shoe 2 and the rear brake shoe 13 is connected with the friction plate 4, preferably the front brake shoe 2 and the rear brake shoe 13 are provided with bolt holes 12, and the front brake shoe 2 and the rear brake shoe are connected by bolts. The shoe 13 is connected to the friction plate 4; the friction plate 4 is connected with the front brake shoe 2 and the rear brake shoe 13 through bolt holes 12, and the friction plate and the brake shoe can be repeatedly disassembled in this way . The friction plate 4 is provided with a plurality of rectangular mounting grooves 5 at intervals along the radial side, and through holes are provided on the webs of the front brake shoe 2 and the rear brake shoe 13 corresponding to the rectangular mounting grooves 5, and the heat pipe 11 is U-shaped. Heat pipes, a plurality of heat pipes 11 pass through the through holes on the webs of the front brake shoe 2 and the rear brake shoe 13 respectively and are fixed in the rectangular mounting groove 5 of the friction plate 4, preferably a plurality of fins 10 are provided on the heat pipe 11 .

The brake wheel cylinder 7 is installed on the brake base plate 6; the fixing method of the heat pipe 11 and the friction plate 4 can be riveted (realize interference fit), and the reliability of this connection method is high; in addition, the connection of the two can also be Soldering is adopted, and the thermal resistance of this connection is small. The two ends of the U-shaped heat pipe extend into the brake drum chamber through the through hole in the brake shoe web.

As shown in FIGS. 4 , 5 , 6 and 8 , the heat pipe array in Embodiment 1 is composed of a plurality of U-shaped heat pipes 11 . And a certain number of fins 10 can be arranged on the heat pipe body according to needs, and the thickness of the fins is generally about 3 mm, and the fins are rectangular. The U-shaped heat pipe 11 and the fin 10 are fixedly connected by pressure riveting or soldering.

The pipe body material of the heat pipe 11 is preferably copper, its two ends are sealed, and the working fluid filled inside is deionized water, naphthalene or N-methylpyrrolidone. The internal peripheral wall of the heat pipe has a sintered layer to increase heat transfer efficiency.

In this embodiment, the cold end of the heat pipe is a drum brake arranged radially. This solution can be divided into a fin (as shown in FIG. 1 ) and a finless (as shown in FIG. 9 ) at the cold end of the heat pipe according to actual needs. .

As shown in Figure 3, the brake base plate 6 is provided with a brake base plate installation hole 6.1, and a brake base plate ventilation groove 6.2 is opened; the brake base plate 6 is fixed on the vehicle frame through the brake base plate installation hole 6.1. As shown in Figure 14-16, the brake drum body 16 is installed on the wheel through the brake drum installation hole 18; the fan blade 17 is installed on the brake drum body 16 through the spline fit of the spline teeth 20 and the spline key groove 21 Above; the brake drum body 16 is provided with an arc-shaped ventilation groove 19 . The brake drum body 16 is mounted on the outer periphery of the friction lining 4 . The air flow enters the brake drum body 16 through the arc-shaped ventilation groove 19, passes through the drum brake using heat pipes and fan blades to dissipate heat, and flows out through the brake bottom plate ventilation groove 6.2.

Example 2

As shown in Figures 10 to 13, a drum brake using heat pipes and fan blades for heat dissipation includes front brake shoes 2, rear brake shoes 13, friction plates 4, brake shoe return springs 1, brake wheels Cylinder 7, heat pipe 11 and support pin 14; one end of front brake shoe 2 and rear brake shoe 13 are respectively movably connected on the brake base plate 6 through two support pins 14, front brake shoe 2 and rear brake shoe 13 The other end of the brake wheel cylinder is respectively connected to the brake wheel cylinder piston 9 through the brake wheel cylinder piston pin 8, and the brake wheel cylinder piston 9 is arranged in the brake wheel cylinder 7; the brake shoe return spring 1 is respectively connected with the front brake shoe 2 is connected with rear brake shoe 13;

The outer circumference of the front brake shoe 2 and the rear brake shoe 13 is connected with the friction plate 4, preferably the front brake shoe 2 and the rear brake shoe 13 are provided with bolt holes 12, and the front brake shoe 2 and the rear brake shoe are connected by bolts. The shoe 13 is connected to the friction plate 4; the friction plate 4 is connected with the front brake shoe 2 and the rear brake shoe 13 through bolt holes 12, and the friction plate and the brake shoe can be repeatedly disassembled in this way . As shown in Figure 12, a plurality of arc-shaped semicircular heat pipe installation grooves are arranged at intervals along the circumferential direction on the inner surface of the friction plate 4, as shown in Figure 11, the corresponding friction between the front brake shoe 2 and the rear brake shoe 13 The outer surface of the web 3 at the semicircular heat pipe installation groove of the sheet 4 is provided with a plurality of arc-shaped semicircular heat pipe installation grooves 15 at intervals, and a plurality of heat pipes 11 are respectively arranged on the web of the friction plate 4 and the rear brake shoe 13 Preferably, a plurality of fins 10 are provided at the cold end of the heat pipe 11 in the opened semicircular heat pipe installation groove. The hot end installed in the heat pipe in the friction plate 4 and the friction plate 4 and the rear brake shoe 13 web is also arc-shaped, and its length (arc length) can be adjusted according to actual conditions.

The basic working principle of embodiment 2 is completely the same as that of embodiment 1, only the layout of the cold end of the heat pipe is different. As shown in Figure 10 and Figure 13, the cold end of the heat pipe in Embodiment 2 is arranged vertically, wherein Figure 10 shows that the cold end of the heat pipe is provided with fins 10, and Figure 13 shows that the cold end of the heat pipe is not provided with fins. Whether fins need to be provided and the number and size of fins can also be determined according to actual conditions.

Other parts not described in this embodiment are the same as those in Embodiment 1.

The installation process includes the following steps:

Step 1: using machine tool processing equipment to open a rectangular groove 5 or an arc-shaped semicircular groove 15 on the inner surface of the friction plate 4, and at the same time process a friction plate installation hole 12 for fixed connection with the brake shoe web. On the other hand, a circular hole for heat pipe installation is processed on the corresponding position of the brake shoe web or an arc-shaped semicircular groove identical to the inner surface of the friction plate 4 is processed on its outer surface.

Step 2: Press the evaporation section (hot end) of the formed heat pipe 11 into the friction plate 4 that has opened the rectangular groove 5 or the arc-shaped semicircular groove 15, and at the same time, coat the hot end of the heat pipe and the groove of the friction plate Appropriate thermal silica gel is used to eliminate air thermal resistance. At the same time, the cold end of the heat pipe is stretched into the brake drum chamber through the through hole on the brake shoe web. The fixing method between the heat pipe and the friction plate can be riveted or soldered. The tube body material of the heat pipe is copper, its two ends are sealed, and the working fluid filled inside is deionized water, naphthalene or N-methylpyrrolidone.

Step 3: Fix the friction plate 4, the front brake shoe 2 with the web and the rear brake shoe 13 with bolts. If necessary, a certain number of fins 10 can be installed in the condensation section of the heat pipe. The heat pipe 11 and the fin 10 are fixedly connected by pressure riveting or soldering. The number and size of the fins 10 can be adjusted according to the actual space inside the brake drum.

Step 4: Install the brake shoe with the heat pipe installed on the brake base plate 6 through the support pin 14, and use bolts to link the brake base plate with the flange on the rear drive axle casing half shaft sleeve (if it is used as a front wheel brake , then connect the brake base plate with the flange of the steering knuckle of the front axle).

Step 5: Connect the brake drum with the fan blades 17 inside to the hub of the wheel, and at the same time match it with the brake bottom plate, so as to form a drum brake with heat pipes for heat dissipation.

As mentioned above, the utility model can be better realized.

The implementation of the present utility model is not limited by the above-mentioned examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present utility model should be equivalent replacement methods. Included within the protection scope of the present utility model.

Claims (9)

1. apply the drum brake of heat pipe and flabellum heat radiation, comprise fore brake, rear brake shoe, friction plate, brake shoe return spring, wheel cylinder, flabellum, heat pipe and supporting pin; One end of fore brake and rear brake shoe is movably connected on braking bottom board respectively by two supporting pins, the other end of fore brake and rear brake shoe is connected on wheel cylinder piston respectively by wheel cylinder wrist pin, and wheel cylinder piston is arranged in wheel cylinder; Brake shoe return spring is connected with fore brake and rear brake shoe respectively; Friction plate is connected with the periphery of rear brake shoe at fore brake; It is characterized in that, fore brake and rear brake shoe and friction plate are interval with many heat pipes; Brake drum body is arranged on the periphery of friction plate; Brake drum body is arranged on wheel by brake drum mounting hole; Flabellum is arranged on brake drum body; Brake drum body is offered arc vent slot.

2. the drum brake of application heat pipe according to claim 1 and flabellum heat radiation, it is characterized in that, described friction plate clear width is radially provided with multiple rectangle mounting groove, on the web of fore brake and rear brake shoe, corresponding rectangle mounting groove place is provided with through hole, heat pipe is U-shaped heat pipe, and the through hole that multiple heat pipe is each passed through on fore brake and rear brake shoe web is fixed in the rectangle mounting groove of friction plate.

3. the drum brake of application heat pipe according to claim 1 and flabellum heat radiation, it is characterized in that, the semi-circular heat pipes mounting groove of many arcuations is circumferentially interval with at the internal surface of friction plate, at the spaced apart semi-circular heat pipes mounting groove being provided with many arcuations of web outer surface at the semi-circular heat pipes mounting groove place of the corresponding friction plate of fore brake and rear brake shoe, many heat pipes are separately positioned in the semi-circular heat pipes mounting groove that friction plate and rear brake shoe web are offered.

4. according to claim 1 ?the drum brake of application heat pipe described in 3 any one and flabellum heat radiation, it is characterized in that, the described cold junction at heat pipe is provided with multiple fin.

5. the drum brake of application heat pipe according to claim 4 and flabellum heat radiation, is characterized in that, the thickness of described fin be 2 ?4mm, rectangular shape.

6. the drum brake of application heat pipe according to claim 4 and flabellum heat radiation, it is characterized in that, described heat pipe is fixedly connected with adopting squeezing-rivet type or soldering formula between fin.

7. the drum brake of application heat pipe according to claim 1 and flabellum heat radiation, is characterized in that, be provided with bolt hole, by bolt, fore brake be connected friction plate with rear brake shoe at fore brake and rear brake shoe.

8. the drum brake of application heat pipe according to claim 1 and flabellum heat radiation, it is characterized in that, the body material of described heat pipe is copper, the sealing of its two ends, the working medium that fills of inside be deionized water, naphthalene with or N ?methyl pyrrolidone.

9. the drum brake of application heat pipe according to claim 1 and flabellum heat radiation, it is characterized in that, described flabellum is arranged on brake drum body by the spline fitted of spline key tooth and spline keyway.