Auxiliary braking and air pressure heat dissipation device of automobile drum brake

Abstract

The utility model discloses an auxiliary braking and air pressure heat dissipation device of an automobile drum brake. The auxiliary braking and air pressure heat dissipation device comprises an auxiliary braking wheel, a rotating shaft, a swing support, a telescopic air cylinder, a piston connecting rod mechanism, an air pump, an exhaust valve, an air inlet valve, an air pump support, a hose, a return spring, an air storage tank and a flow guide device. When a vehicle is braked, the auxiliary brake wheel makes contact with a vehicle tire to generate rotation resistance to achieve the auxiliary brake effect, the auxiliary brake wheel is fixedly connected with the rotating shaft and drives the rotating shaft to rotate, the rotating shaft penetrates through the bottom of the swing support and is connected through a bearing, and the piston connecting rod mechanism is connected to the rotating shaft and reciprocates in the air pump to generate compressed air. An exhaust valve and an air inlet valve are installed on the air pump, the exhaust valve is connected with the air storage tank through a hose, compressed air in the air storage tank is exhausted to the surface of the brake through the flow guiding device, and the heat dissipation effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of braking of medium and heavy commercial vehicles, and discloses an auxiliary braking and air pressure heat dissipation device for automobile drum brakes. Background Art

[0002] As one of the important modes of transportation in my country, road transportation mainly relies on trucks to transport goods. Large transport vehicles need to frequently use brakes to reduce speed to ensure safety on continuous downhill sections. At this time, a large amount of heat is generated between the friction pairs of the brakes, and the brakes experience thermal decay. Since the heat generated by friction cannot be quickly dissipated, the temperature of the entire brake system rises, thereby reducing the braking effect.

[0003] In order to solve the problem of thermal decay, in addition to using high-temperature resistant materials to make brakes, the current brake cooling devices mostly use coolant for cooling, which is applicable to both disc and drum brakes. For example, the Chinese utility model patent with announcement number CN215154538U discloses "a water spray cooling device for automobile drum brakes". It is built into the brake drum by a water spray device, and the water pipe is connected to the water tank of the car. However, it is large in size and has a long water pipe. Parts such as the brake drum and brake bottom plate need to be re-molded, which increases the production cost. At the same time, the method of using coolant for cooling has obvious shortcomings. When the coolant is sprayed on the high-temperature brake drum or brake pad, it may cause deformation and affect the mechanical properties. When the coolant is sprayed between the friction pairs, a water film may be generated on the friction surface, which is very likely to cause slippage and extend the braking distance. At the same time, in cold weather areas, spraying coolant may cause icing, and it is troublesome to replenish cooling water. If there is a cooling water leak, it will also cause the road surface to be slippery and icy, causing driving hazards. Utility Model Content

[0004] In order to solve the shortcomings of the existing technology and improve the thermal decay phenomenon of the brake, the utility model provides an auxiliary braking and air pressure heat dissipation device for an automobile drum brake.

[0005] The technical solution adopted by the utility model is: an auxiliary brake and air pressure heat dissipation device for automobile drum brakes, including an auxiliary brake wheel, a rotating shaft, a swing bracket, a telescopic cylinder, a piston connecting rod mechanism, an air pump, an exhaust valve, an air intake valve, an air pump bracket, a hose, a return spring, an air storage tank, and a guide device; the auxiliary brake wheel is fixedly connected with the rotating shaft, the rotating shaft passes through the bottom of the swing bracket, and is connected by a bearing, the rotating shaft is connected with a piston connecting rod mechanism, and the piston connecting rod mechanism reciprocates in the air pump; an exhaust valve and an air intake valve are installed on the air pump, the exhaust valve is connected with the air storage tank through a hose, and the gas in the air storage tank is discharged through the guide device. The two ends of the telescopic cylinder are connected to the frame and the swing bracket, which are used to open the drum brake auxiliary brake and air pressure heat dissipation device; the two ends of the return spring are connected to the frame and the swing bracket, which are used to retract the drum brake auxiliary brake and air pressure heat dissipation device. The part connected to the rotating shaft and the piston connecting rod mechanism is designed in the form of a crankshaft. When the auxiliary brake wheel contacts the vehicle tire and rotates, the auxiliary brake wheel drives the rotating shaft to rotate, and at the same time realizes the reciprocating motion of the piston connecting rod mechanism. The rotating shaft is always in parallel with the half shaft of the vehicle. The compressed gas generated by the air pump is stored in the air tank; one end of the guide device is connected to the air tank, and the other end extends downward to the surface of the drum brake to achieve heat dissipation. The utility model is installed under the frame near the rear wheel through a swing bracket. The auxiliary brake wheel contacts the vehicle tire and generates an auxiliary braking effect by virtue of the resistance of the auxiliary brake wheel rotation. The air pressure heat dissipation device provides power through the rotation of the rotating shaft of the auxiliary brake wheel and generates compressed air to blow to the surface of the drum brake for heat dissipation. The innovative design of the utility model includes the following contents:

[0006] Auxiliary brake wheel: The auxiliary brake wheel can assist in reducing the speed of the vehicle until it stops by contacting and rubbing with the tire of the vehicle. The resistance of the auxiliary brake wheel when rotating is variable, which can achieve an effect similar to the ABS braking of a car. The auxiliary brake wheel drives the shaft to rotate as the power source of the subsequent air pressure heat dissipation device.

[0007] Rotating shaft: A part of the rotating shaft is designed in the form of a crankshaft, which can drive the piston connecting rod mechanism to perform reciprocating motion. The rotational resistance of the rotating shaft is variable, and the rotational resistance of the auxiliary brake wheel can be changed.

[0008] Telescopic cylinder and swing bracket: The telescopic cylinder connected to the swing bracket can be connected to the air brake system pipeline of the car, so that when the driver steps on the brake pedal and the brake pipeline generates pressure, the telescopic cylinder is inflated to push the swing bracket to open, and the auxiliary brake wheel contacts the wheel, increasing the friction to achieve the auxiliary braking effect. When the driver releases the brake pedal, the pressure in the air brake pipeline disappears, and the return spring pulls the swing bracket back to the bottom of the frame.

[0009] Air pump: It has a built-in piston-connecting rod mechanism, and an intake valve and an exhaust valve are installed on the outside. Both are one-way valves, and compressed air is generated through the reciprocating motion of the piston.

[0010] Air tank and guide device: The air tank stores the compressed gas generated by the air pump. The air tank is connected to the guide device to reduce the shape of the air outlet to ensure that the air flow rate is increased so that the compressed gas can effectively contact the surface of the drum brake to take away the heat.

[0011] The utility model describes an automobile drum brake auxiliary braking and air pressure heat dissipation device, which can provide ABS-type auxiliary braking through the contact friction between the auxiliary brake wheel and the vehicle tire. The air pressure heat dissipation device guides the air flow to directly contact the brake surface, improves the thermal decay phenomenon of the drum brake, keeps the brake temperature within an appropriate range, and provides a safer and more reliable vehicle braking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0014] Figure 2 This is a schematic diagram of the pipeline system of the air pressure heat dissipation device of the utility model.

[0015] Figure 3 It is a schematic diagram of the swing bracket of the utility model in the open state.

[0016] Figure 4 It is a schematic diagram of the retracted state of the swing bracket of the utility model.

[0017] Figure numerals: 1. Auxiliary brake wheel; 2. Rotating shaft; 3. Swinging bracket; 4. Telescopic cylinder; 5. Piston-connecting rod mechanism; 6. Air pump; 7. Exhaust valve; 8. Intake valve; 9. Air pump bracket; 10. Hose; 11. Return spring; 12. Air tank; 13. Diversion device. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "axial", "radial", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0020] like Figure 1 As shown, the utility model is an auxiliary brake and air pressure heat dissipation device for automobile drum brakes, comprising an auxiliary brake wheel 1, a rotating shaft 2, a swing bracket 3, a telescopic cylinder 4, a piston connecting rod mechanism 5, an air pump 6, an exhaust valve 7, an intake valve 8, an air pump bracket 9, a hose 10, a return spring 11, an air tank 12, and a flow guide device 13. The utility model is suitable for medium and heavy commercial vehicles, and one set of the utility model can be arranged on the left and right rear wheels of the vehicle.

[0021] The following describes how the auxiliary braking effect is achieved: when the vehicle brakes, the pressure in the air brake pipeline increases, the telescopic cylinder 4 is inflated to push the swing bracket 3 down to contact the vehicle tire, and the shaft 2 rotates at this time. A part of the shaft 2 is designed as a crankshaft style and is connected to the piston connecting rod mechanism 5. When the shaft 2 rotates, it can achieve reciprocating motion. The shaft 2 is always in a parallel state with the half shaft of the vehicle, such as Figure 2 As shown; an exhaust valve 7 and an intake valve 8 are provided on the outside of the air pump 6, both of which are one-way valves. During the compression stroke of the piston-connecting rod mechanism 5, the rotational resistance of the rotating shaft 2 increases; during the suction stroke of the piston-connecting rod mechanism 5, the rotational resistance of the rotating shaft 2 decreases, that is, the rotation of the rotating shaft will affect the rotational resistance of the auxiliary brake wheel 1. Through the contact between the auxiliary brake wheel 1 and the vehicle tire, the friction force can be increased to achieve the purpose of auxiliary braking. At the same time, the wave-like rotational resistance of the auxiliary brake wheel 1 can achieve an effect similar to that of an automobile ABS system; the air pump 6 is fixed by an air pump bracket 9, and the air pump bracket 9 is welded to the swing bracket 3.

[0022] The following describes how the air pressure heat dissipation effect is achieved: when the driver performs the braking operation, the auxiliary brake wheel 1 contacts the vehicle tire, the rotating shaft 2 drives the piston connecting rod mechanism 5 to achieve reciprocating motion, and the compressed gas generated in the air pump 6 is discharged through the exhaust valve 7, and then stored in the air tank 12 through the hose 10. A one-way valve (not shown in the figure) is provided at the connection between the air tank 12 and the guide device 13, which will not open until a certain pressure is reached. The compressed gas stored in the air tank 12 can be sprayed onto the surface of the vehicle drum brake through the guide device 13 to achieve the heat dissipation effect. When the braking purpose is achieved, that is, the driver releases the brake pedal and the pressure in the brake system pipeline drops, the return spring 11 pulls the swing bracket 3 back to the bottom of the frame. One end of the return spring 11 is fixed to the swing bracket 3 by welding, and the other end is fixed to the frame by welding. The schematic diagram of the open state of the utility model is shown in Figure 3 As shown, the schematic diagram of the retracted state is as follows Figure 4 shown.

[0023] The embodiments of the utility model disclosed above are only used to help illustrate the utility model. The embodiments do not describe all the details in detail, nor do they limit the utility model to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is only limited by the claims and their full scope and equivalents.

Claims

1. An auxiliary brake and air pressure heat dissipation device for automobile drum brakes, comprising an auxiliary brake wheel (1), a rotating shaft (2), a swing bracket (3), a telescopic cylinder (4), a piston connecting rod mechanism (5), an air pump (6), an exhaust valve (7), an intake valve (8), an air pump bracket (9), a hose (10), a return spring (11), an air storage tank (12), and a flow guide device (13); characterized in that: The auxiliary brake wheel (1) is fixedly connected to the rotating shaft (2), the rotating shaft (2) passes through the bottom of the swing bracket (3) and is connected by a bearing. The rotating shaft (2) is connected to a piston connecting rod mechanism (5), and the piston connecting rod mechanism (5) reciprocates in an air pump (6). An exhaust valve (7) and an intake valve (8) are installed on the air pump (6), the exhaust valve (7) is connected to an air storage tank (12) through a hose (10), and the gas in the air storage tank (12) is discharged through a flow guide device (13).

2. The automobile drum brake auxiliary braking and air pressure heat dissipation device according to claim 1, characterized in that: The two ends of the telescopic cylinder (4) are connected to the vehicle frame and the swing bracket (3) for opening the drum brake auxiliary braking and air pressure heat dissipation device; the two ends of the return spring (11) are connected to the vehicle frame and the swing bracket (3) for retracting the drum brake auxiliary braking and air pressure heat dissipation device.

3. The automobile drum brake auxiliary braking and air pressure heat dissipation device according to claim 1, characterized in that: The portion where the rotating shaft (2) is connected to the piston connecting rod mechanism (5) is designed in the form of a crankshaft. When the auxiliary brake wheel (1) contacts the tire of the vehicle and rotates, the auxiliary brake wheel (1) drives the rotating shaft (2) to rotate, and at the same time realizes the reciprocating motion of the piston connecting rod mechanism (5).

4. The automobile drum brake auxiliary braking and air pressure heat dissipation device according to claim 1, characterized in that: The rotating shaft (2) is always in a parallel state with the half shaft of the vehicle.

5. The automobile drum brake auxiliary braking and air pressure heat dissipation device according to claim 1, characterized in that: The compressed gas generated by the air pump (6) is stored in the air storage tank (12); one end of the flow guide device (13) is connected to the air storage tank (12), and the other end extends downward to the surface of the drum brake to achieve a heat dissipation effect.

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