Active return structure of automobile brake pad

Abstract

The invention relates to the technical field of brake pad return structures, in particular to an automobile brake pad active return structure which comprises a mounting disc, a brake shoe, a rotating shaft, a power shaft, a brake drum and a return spring used in cooperation with a brake wheel cylinder, and further comprises a cooling assembly. The two groups of brake shoes are rotationally connected with the mounting disc through rotating shafts; the brake drum is fixedly connected with the power shaft through a bolt; the return spring is mounted between the two groups of brake shoes; the power shaft is rotationally connected with the mounting disc; the cooling assembly comprises a surrounding piece, a suction piece and a storage piece. By arranging the cooling assembly, when a driver steps on a brake wheel cylinder to push a brake shoe to open, cold oil in an oil tank can be sucked into a cooling box at the moment, so that the effect of cooling a return spring is achieved, and deformation and damage caused by long-term high temperature are prevented; and the fan can dissipate heat of oil in the oil tank along with rotation of the power shaft.

Description

Technical Field

[0001] The invention relates to the technical field of brake pad return structures, in particular to an active return structure for a brake pad of an automobile. Background Art

[0002] Drum brakes are a traditional automobile braking system that uses hydraulic pressure to push the brake shoes to rub against the inner surface of the brake drum that rotates with the wheel, generating braking force to slow down or stop the wheel. The design of the brake drum is similar to a tambourine. When the brake is applied, the brake shoes open outward and contact the inner wall of the brake drum to generate friction. When the brake is released, the return spring will pull the brake shoes back to their original position. Due to the low level of manufacturing technology, the parts processing and composition of drum brakes are simple, so the cost is relatively low. Although the application of drum brakes in the field of passenger cars is gradually decreasing, they are still widely used in the field of commercial vehicles, especially large trucks, due to their advantages of strong braking force and low cost.

[0003] When a large truck passes through a long downhill section or a congested section, the brakes will be applied continuously. The friction between the brake pads and the brake drum will generate a lot of heat. Since the inside of the brake drum is relatively closed, excessive braking frequency will cause the temperature inside the brake drum to rise, and the temperature of the return spring will also rise accordingly. High temperature will cause creep and stress relaxation in the return spring, resulting in permanent deformation, making it impossible to effectively reset the brake shoe, causing the brake pad on the brake shoe to be in contact with the brake drum all the time, resulting in a large loss of the brake pad, which will lead to brake failure over time, which will greatly affect the operating safety of the truck. In addition, the brake pad will produce tiny debris during the long-term braking process, and these debris will fall on the rotating shaft of the brake shoe, generating greater friction on the operation of the brake shoe, affecting the smoothness of the brake shoe operation.

[0004] Therefore, an active return structure of automobile brake pads is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide an active return structure for automobile brake pads, which solves the problem that excessively high braking frequency will cause the temperature in the brake drum to rise, thereby causing creep and stress relaxation in the return spring, resulting in permanent deformation, and thus making it impossible to effectively reset the brake shoe. When the driver steps on the brake and the brake shoe opens, the colder oil will be sucked from the oil tank into the cooling box by the suction cylinder, thereby cooling the return spring, and during the driving of the truck, the fan blades will rotate with the power shaft, thereby cooling and dissipating the oil in the oil tank for continuous cold oil output.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The active return structure of automobile brake pads includes a return spring used in conjunction with a mounting plate, a brake shoe, a rotating shaft, a power shaft, a brake drum and a brake wheel cylinder, and also includes a cooling component; the brake shoe is provided with two groups, and both groups of brake shoes are rotatably connected to the mounting plate through a rotating shaft; the brake wheel cylinder can push the brake shoe to open; the brake drum is fixedly connected to the power shaft by bolts; the return spring is installed between the two groups of brake shoes; the power shaft is rotatably connected to the mounting plate; the cooling component includes a surrounding part, a suction part and a storage part; the surrounding part is fixedly sleeved on the outside of the return spring; the suction part is rotatably connected between the two groups of brake shoes; the storage part is fixedly connected to one side of the mounting plate, and the storage part is arranged around the outer ring of the power shaft, and the power shaft passes through the middle of the storage part. When the power shaft rotates, it will cool and dissipate the cooling oil in the storage part; the suction part can suck the low-temperature cooling oil in the storage part into the surrounding part as the brake shoe opens; the suction part is connected to the surrounding part, and the surrounding part is connected to the storage part.

[0008] Preferably, the surrounding component includes a cooling box and a sealing rubber sleeve; the cooling box sleeve is arranged on the outside of the return spring; the sealing rubber sleeve is made of a retractable and foldable rubber material, and there are two groups of sealing rubber sleeves, which are respectively arranged on both sides of the cooling box, one side of the sealing rubber sleeve is sealed to the cooling box, and the other side is sealed to the return spring, and the sealing rubber sleeve can be retracted and extended following the movement of the return spring.

[0009] Preferably, the suction member includes a suction cylinder, a piston, a connecting rod, a connecting block and a connecting pipe; the connecting block is fixedly connected to the brake shoe; the piston is slidably connected to the suction cylinder, and there are two groups of pistons, which are symmetrically arranged in the suction cylinder; one end of the connecting rod is fixedly connected to the piston, and the other end is rotatably connected to the connecting block; the suction cylinder and the cooling box are connected and communicated through a connecting pipe, and when the brake shoe is opened, the suction member will suck the cold oil into the cooling box, thereby cooling the return spring.

[0010] Preferably, the storage component includes an oil tank and an air vent; the oil tank is fixedly connected to the outside of the mounting plate and is in a ring shape; the air vent is fixedly connected to the top of the oil tank, and the air vent provides air intake to facilitate the suction cylinder to extract the cold oil in the oil tank and allow hot oil to enter.

[0011] Preferably, the oil tank is also provided with a heat dissipation pipe, a connecting plate, a second connecting pipe and fan blades; the heat dissipation pipe is fixedly connected to the oil tank through the connecting plate, and the heat dissipation pipe is in a threaded form and is connected to the oil tank; the second connecting pipe is fixedly connected between the heat dissipation pipe and the cooling box; the fan blades are fixedly connected to the power shaft, and the fan blades are provided in multiple groups and are arrayed on the outer surface of the power shaft with the axis of the power shaft as the center. When the brake shoes are merged, the oil in the cooling box will pass through the heat dissipation pipe and finally enter the oil tank, and the fan blades that rotate with the power shaft will quickly cool down the oil in the heat dissipation pipe.

[0012] Preferably, the connecting plates are provided with four groups, and the center of the heat dissipation pipe is taken as the center of the circle, and the circumference is arrayed on the outer surface of the heat dissipation pipe, and the connecting plates are made of heat-conducting metal material, and the connecting plates have heat-conducting properties, which can transfer heat between the heat dissipation pipe and the oil tank, thereby accelerating the cooling.

[0013] Preferably, the mounting plate is also provided with a through opening; the second connecting pipe can pass through the through opening to be connected to the cooling box and the heat dissipation pipe, and the through opening can make the use distance of the second connecting pipe between the cooling box and the heat dissipation pipe the shortest.

[0014] Preferably, the suction cylinder is also provided with an injection assembly; the injection assembly includes a connecting pipe three, a pressure cylinder, a connecting pipe four and a nozzle part; the pressure cylinder is fixedly connected to the brake shoe; the connecting pipe three is fixedly connected between the suction cylinder and the pressure cylinder; the nozzle part is fixedly connected to the brake shoe, and the nozzle part is located above the rotating shaft, and the connecting pipe four is fixedly connected between the pressure cylinder and the nozzle part; when the brake shoe is opened, the pressure cylinder compresses the gas, and when the threshold value is reached, the gas will be discharged from the pressure cylinder and ejected from the nozzle part, and the ejected gas can play a role in cleaning dust chips from the rotating shaft.

[0015] Preferably, the pressure cylinder is also provided with a pressure plug, a one-way air valve and an elastic member; the pressure plug is slidably connected to the pressure cylinder; the one-way air valve is fixedly connected to the center of the pressure plug; the elastic member is fixedly connected between the pressure plug and the pressure cylinder, and the elastic member provides an upward thrust for the pressure plug. When the pressure plug moves downward under the thrust of the gas, the one-way air valve is in a closed state, and when the pressure plug passes through the fourth position of the connecting pipe, the gas will be ejected from the fourth connecting pipe.

[0016] Preferably, the nozzle component includes an arc tube and an air outlet; the arc tube is fixedly connected to the brake shoe, and the arc tube is in the form of an arc-shaped circular tube, and is located above the rotating shaft; the air outlet is fixedly connected to the arc tube, and the air outlet is arranged in multiple groups and is arranged in an arc array on the inner arc surface of the arc tube. When the suction cylinder extracts oil, the gas in the suction cylinder will be pressurized by the pressure cylinder and finally ejected from the air outlet, thereby cleaning the dust on the rotating shaft.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. When the drum brake system of a truck passes through a long downhill section or brakes frequently, the temperature of the return spring will rise, which will cause stress relaxation and permanent deformation of the return spring over time. The present invention provides a cooling component. When the driver steps on the brake wheel cylinder to push the brake shoe to open, the brake shoe will drive the two sets of connecting rods to open to both sides at the same time, thereby driving the two sets of pistons away from each other in the suction cylinder. At this time, the colder oil in the oil tank will be sucked into the cooling box to achieve the effect of cooling the return spring, preventing deformation and damage caused by long-term high temperature.

[0019] 2. When the brake is released, the brake shoes will move closer to each other and merge under the action of the return spring. At this time, the oil in the suction cylinder will return to the cooling box, and the oil in the cooling box will be pushed into the oil tank. Before the oil enters the oil tank, it will be cooled by the rotating fan blades of the heat dissipation pipe. The fan will also dissipate heat for the oil in the oil tank as the power shaft rotates. Since the volume of oil sucked by the suction cylinder is greater than the capacity of the surrounding box, it can ensure that more cold oil is sucked in to neutralize and cool the oil in the cooling box that heats up with the brakes, thereby achieving the effect of cyclic cooling of the return spring.

[0020] 3. The present invention sets an injection assembly. When the brake shoe opens the suction cylinder to extract oil, the gas in the suction cylinder will enter the pressure cylinder, be compressed and stored, and then be ejected from the air outlet along the compression tube, thereby cleaning the dust on the rotating shaft, preventing the dust generated by the friction between the brake pad and the brake drum from accumulating on the rotating shaft and increasing the friction of the brake shoe rotation. When the brake shoe merges, the gas will enter from the air outlet, pass through the one-way air valve and finally return to the suction cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall appearance of the three-dimensional structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the internal structure of the brake drum of the present invention;

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the cooling component of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the surrounding member and the suction member of the present invention;

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the storage element of the present invention;

[0026] Figure 6 It is an enlarged three-dimensional structural schematic diagram of the oil tank of the present invention;

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the jet assembly of the present invention;

[0028] Figure 8 It is a schematic diagram of the cross-sectional structure of the pressure cylinder of the present invention.

[0029] In the figure: 1. mounting plate; 11. opening; 2. brake shoe; 3. rotating shaft; 4. power shaft; 5. brake drum; 6. brake wheel cylinder; 7. return spring; 8. cooling assembly; 81. surrounding member; 811. cooling box; 812. sealing rubber sleeve; 82. suction member; 822. suction cylinder; 823. piston; 824. connecting rod; 825. connecting block; 826. connecting pipe one; 83. storage member; 831. oil tank; 832. air vent; 8311. heat dissipation pipe; 8312. connecting piece; 8313. connecting pipe two; 8314. fan blade; 9. jet assembly; 91. connecting pipe three; 92. pressure cylinder; 921. pressure plug; 922. one-way air valve; 923. elastic member; 93. connecting pipe four; 94. nozzle member; 941. arc pipe; 942. air outlet. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] Reference Figure 1 , 27 is the first embodiment of the present invention, which provides an active return structure for automobile brake pads, which can realize oil cooling of the return spring 7 to prevent stress relaxation of the return spring 7 caused by high temperature, and includes a return spring 7 used in conjunction with the mounting plate 1, the brake shoe 2, the rotating shaft 3, the power shaft 4, the brake drum 5 and the brake wheel cylinder 6, and also includes a cooling component 8; the brake shoe 2 is provided with two groups, and the two groups of brake shoes 2 are rotatably connected to the mounting plate 1 through the rotating shaft 3, and the mounting plate 1 is fixedly installed on the truck in a stationary state; the brake wheel cylinder 6 can push the brake shoe 2 to open; the brake drum 5 is fixedly connected to the power shaft 4 by bolts, and the brake drum 5 rotates with the rotation of the power shaft 4; the return spring 7 is installed between the two groups of brake shoes 2, and the two ends of the return spring 7 are rotatably connected to the two groups of brake shoes 2 through the wheel axle, and the wheel axle can reduce the braking When the shoe 2 stretches the return spring 7, the friction stress on the two ends of the return spring 7 is exerted; the power shaft 4 is rotatably connected to the mounting plate 1, and the power shaft 4 is the driving shaft of the truck tire; the cooling component 8 includes a surrounding part 81, a suction part 82 and a storage part 83; the surrounding part 81 is fixedly sleeved on the outside of the return spring 7; the suction part 82 is rotatably connected between the two groups of brake shoes 2; the storage part 83 is fixedly connected to one side of the mounting plate 1, and the storage part 83 is arranged around the outer ring of the power shaft 4, and the power shaft 4 passes through the middle of the storage part 83. When the power shaft 4 rotates, it will cool and dissipate the cooling oil in the storage part 83; the suction part 82 can suck the low-temperature cooling oil in the storage part 83 into the surrounding part 81 as the brake shoe 2 opens; the suction part 82 is connected to the surrounding part 81, and the surrounding part 81 is connected to the storage part 83.

[0033] During use, when the truck brakes, the brake wheel cylinder 6 will push the brake shoe 2 to open, so that the brake pad on the brake contacts the brake drum 5, thereby achieving the purpose of braking. When the brake shoe 2 opens, it will drive the suction member 82 to open. During the opening process, the suction member 82 will suck the oil in the storage member 83 into the suction member 82. Since the suction member 82, the surrounding member 81 and the storage member 83 are connected, the cooler oil in the storage member 83 will enter the surrounding member 81 at this time, thereby achieving the effect of cooling the return spring 7 in the surrounding member 81, and the oil in the storage member 83 will be automatically cooled during the driving of the truck.

[0034] Example 2

[0035] Reference Figures 3 to 6 , which is the second embodiment of the present invention, and is different from the first embodiment in that it also includes a cooling component 8. In the previous embodiment, the active return structure of the automobile brake pad includes a return spring 7 used in conjunction with the mounting plate 1, the brake shoe 2, the rotating shaft 3, the power shaft 4, the brake drum 5 and the brake wheel cylinder 6, and also includes a cooling component 8. The cooling component 8 includes a surrounding part 81, a suction part 82 and a storage part 83.

[0036] Furthermore, the surrounding part 81 includes a cooling box 811 and a sealing rubber sleeve 812; the cooling box 811 is sleeved on the outside of the return spring 7; the sealing rubber sleeve 812 is made of a retractable and foldable rubber material, and there are two groups of sealing rubber sleeves 812, which are respectively arranged on both sides of the cooling box 811. One side of the sealing rubber sleeve 812 is sealed and connected to the cooling box 811, and the other side is sealed and connected to the return spring 7. The sealing rubber sleeve 812 can be retracted and extended following the movement of the return spring 7. When the brake shoe 2 is opened, the sealing rubber sleeve 812 will stretch along with the stretching of the spring.

[0037] Furthermore, the suction member 82 includes a suction cylinder 822, a piston 823, a connecting rod 824, a connecting block 825 and a connecting pipe 826; the connecting block 825 is fixedly connected to the brake shoe 2; the piston 823 is slidably connected to the suction cylinder 822, and there are two groups of pistons 823, which are symmetrically arranged in the suction cylinder 822. The volume of oil that can be sucked by the suction cylinder 822 is greater than the capacity volume of the surrounding box; one end of the connecting rod 824 is fixedly connected to the piston 823, and the other end is rotatably connected to the connecting block 825; the suction cylinder 822 and the cooling box 811 are connected and communicated through the connecting pipe 826. When the brake shoe 2 is opened, the two groups of connecting rods 824 will be driven to open to both sides at the same time, thereby driving the two groups of pistons 823 to move away from each other in the suction cylinder 822, and since the suction cylinder 822 is connected to the cooling box 811, the oil in the cooling box 811 will be sucked into the suction cylinder 822 during this action.

[0038] Furthermore, the storage component 83 includes an oil tank 831 and an air vent 832; the oil tank 831 is fixedly connected to the outside of the mounting plate 1, and the oil tank 831 is ring-shaped; the air vent 832 is fixedly connected to the top of the oil tank 831, and the air vent 832 provides air intake and exhaust functions when the suction component 82 is working.

[0039] Furthermore, the fuel tank 831 is also provided with a heat dissipation pipe 8311, a connecting piece 8312, a second connecting pipe 8313 and a fan blade 8314; the heat dissipation pipe 8311 is fixedly connected to the fuel tank 831 through the connecting piece 8312, and the heat dissipation pipe 8311 is in a threaded form and is communicated with the fuel tank 831; the second connecting pipe 8313 is fixedly connected between the heat dissipation pipe 8311 and the cooling box 811; the fan blade 8314 is fixedly connected to the power shaft 4, and the fan blade 8314 is provided in multiple groups and is arrayed on the outer surface of the power shaft 4 with the axis of the power shaft 4 as the center. During the driving of the vehicle, the heat dissipation fins on the power shaft 4 will continuously cool the heat dissipation pipe 8311 and the oil in the fuel tank 831.

[0040] Among them, there are four groups of connecting plates 8312, and the center of the heat pipe 8311 is taken as the center of the circle, and the circular array is on the outer surface of the heat pipe 8311. The connecting plates 8312 are made of heat-conducting metal material. The connecting plates 8312 have heat-conducting properties and can transfer heat between the heat pipe 8311 and the oil tank 831, thereby accelerating the cooling.

[0041] Among them, the installation plate 1 is also provided with a through hole 11; the connecting pipe 2 8313 can pass through the through hole 11 to connect with the cooling box 811 and the heat dissipation pipe 8311. The through hole 11 can make the connecting pipe 2 8313 have the shortest use distance between the cooling box 811 and the heat dissipation pipe 8311, thereby reducing material costs.

[0042] When in use, when the brake shoe 2 is opened when the brake is stepped on, the two groups of connecting rods 824 will be driven to open to both sides at the same time, thereby driving the two groups of pistons 823 to move away from each other in the suction cylinder 822. At this time, the oil in the oil tank 831 will be sucked into the cooling box 811 to achieve the effect of cooling the return spring 7. The oil in the cooling box 811 will be sucked into the suction cylinder 822. When the brake is released, the brake shoes 2 will move closer to each other and merge under the action of the return spring 7. At this time, the suction cylinder 82 2 will return to the cooling box 811, and the oil in the cooling box 811 will be pushed into the oil tank 831. Before the oil enters the oil tank 831, it will be cooled by the rotating fan blades 8314 of the heat dissipation pipe 8311. Since the volume of oil sucked by the suction cylinder 822 is greater than the capacity of the surrounding box, it can ensure that more cold oil is sucked in to neutralize and cool the oil in the cooling box 811 that is heated up with the brakes, thereby achieving the effect of cyclic cooling of the return spring 7.

[0043] Example 3

[0044] Reference Figure 7 and 8 , which is the third embodiment of the present invention, which is different from the previous two embodiments in that: it also includes an injection assembly 9 arranged on the suction cylinder 822, including a connecting pipe three 91, a pressure cylinder 92, a connecting pipe four 93 and a nozzle part 94, the pressure cylinder 92 is fixedly connected to the brake shoe 2; the connecting pipe three 91 is fixedly connected between the suction cylinder 822 and the pressure cylinder 92, when the suction cylinder 822 performs suction work, the gas in the suction cylinder 822 will enter the pressure cylinder 92; the nozzle part 94 is fixedly connected to the brake shoe 2, and the nozzle part 94 is located above the rotating shaft 3, and the connecting pipe four 93 is fixedly connected between the pressure cylinder 92 and the nozzle part 94; when the brake shoe 2 is opened, the pressure cylinder 92 compresses the gas, and when the threshold is reached, the gas will be discharged from the pressure cylinder 92 and sprayed from the nozzle part 94, and the sprayed gas can play a role in cleaning dust from the rotating shaft 3.

[0045] Furthermore, a pressure plug 921, a one-way air valve 922 and an elastic member 923 are also provided in the pressure cylinder 92; the pressure plug 921 is slidably connected to the pressure cylinder 92; the one-way air valve 922 is fixedly connected to the center of the pressure plug 921; the elastic member 923 is fixedly connected between the pressure plug 921 and the pressure cylinder 92, and the elastic member 923 provides an upward thrust for the pressure plug 921. When the pressure plug 921 moves downward due to the thrust of the gas, the one-way air valve 922 is in a closed state. When the pressure plug 921 passes the position of the connecting pipe four 93, the gas will be ejected from the connecting pipe four 93.

[0046] Furthermore, the nozzle component 94 includes an arc tube 941 and an air outlet 942; the arc tube 941 is fixedly connected to the brake shoe 2, and the arc tube 941 is in the form of an arc-shaped circular tube, and is located above the rotating shaft 3; the air outlet 942 is fixedly connected to the arc tube 941, and the air outlet 942 is arranged in multiple groups and is arranged in an arc array on the inner arc surface of the arc tube 941.

[0047] When in use, when the brake shoe 2 opens the suction cylinder 822 to extract oil, the gas in the suction cylinder 822 will enter the pressure cylinder 92, and the gas will push the pressure plug 921 to move downward. When the pressure plug 921 passes through the connecting pipe four 93, the compressed gas will be ejected from the air outlet 942 along the compression pipe, thereby cleaning the dust on the rotating shaft 3. When the brake shoe 2 is merged, the gas will enter from the air outlet 942, pass through the one-way air valve 922 and finally return to the suction cylinder 822.

[0048] Working principle: When the driver steps on the brake, the brake wheel cylinder 6 will push the brake shoe 2 to open. At this time, the brake shoe 2 will drive the two sets of connecting rods 824 to open to both sides at the same time, thereby driving the two sets of pistons 823 to move away from each other in the suction cylinder 822. Since the oil tank 831, the cooling box 811 and the suction cylinder 822 are connected in sequence, the colder oil in the oil tank 831 will be sucked into the cooling box 811 to achieve the effect of cooling the return spring 7. The oil in the cooling box 811 will be sucked into the suction cylinder 822. When the brake is released, the brake shoes 2 will move closer to each other under the action of the return spring 7. At this time, the oil in the suction cylinder 822 will return to the cooling box 811, and the oil in the cooling box 811 will be pushed into the oil tank 831. Before the oil enters the oil tank 831, it will be cooled by the rotating fan blades 8314 of the heat dissipation pipe 8311. The fan will also dissipate heat for the oil in the oil tank 831 as the power shaft 4 rotates. Since the volume of oil sucked by the suction cylinder 822 is greater than the capacity of the surrounding box, it can ensure that more cold oil is sucked in to neutralize and cool down the oil in the cooling box 811 that heats up with the brakes, thereby achieving the effect of cyclic cooling of the return spring 7.

[0049] And because the connecting pipe is fixedly connected between the suction cylinder 822 and the pressure cylinder 92, when the brake shoe 2 opens the suction cylinder 822 to extract oil, the gas in the suction cylinder 822 will enter the pressure cylinder 92, and the gas will push the pressure plug 921 to move downward. When the pressure plug 921 passes through the connecting pipe four 93, the compressed gas will be ejected from the air outlet 942 along the compression pipe, thereby cleaning the dust at the rotating shaft 3 and preventing the dust generated by the friction between the brake pad and the brake drum 5 from accumulating at the rotating shaft 3 to increase the friction of the rotation of the brake shoe 2. When the brake shoe 2 merges, the gas will enter from the air outlet 942 and pass through the one-way air valve 922 and finally return to the suction cylinder 822.

[0050] Even though we have provided specific embodiments of the present invention, it should be clear to those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without violating the fundamental concept and purpose of the present invention. The scope of the present invention is not fixed, but is ultimately determined by the claims contained in the patent document and the equivalent technical solutions. In short, the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An active return structure for automobile brake pads, comprising a return spring (7) used in conjunction with a mounting plate (1), a brake shoe (2), a rotating shaft (3), a power shaft (4), a brake drum (5) and a brake wheel cylinder (6), characterized in that: The invention also comprises a cooling component (8); the brake shoe (2) is provided with two groups, and the two groups of brake shoes (2) are both rotatably connected to the mounting plate (1) through the rotating shaft (3); the brake wheel cylinder (6) can push the brake shoe (2) to open; the brake drum (5) is fixedly connected to the power shaft (4) through bolts; the return spring (7) is installed between the two groups of brake shoes (2); the power shaft (4) is rotatably connected to the mounting plate (1); the cooling component (8) comprises a surrounding part (81), a suction part (82) and a storage part (83); the surrounding part (81) is fixedly sleeved on the outside of the return spring (7); the suction part (82 ) is rotatably connected between the two sets of brake shoes (2); the storage member (83) is fixedly connected to one side of the mounting plate (1), and the storage member (83) is arranged around the outer ring of the power shaft (4), and the power shaft (4) passes through the middle of the storage member (83). When the power shaft (4) rotates, it will cool and dissipate the cooling oil in the storage member (83); the suction member (82) can suck the low-temperature cooling oil in the storage member (83) into the surrounding member (81) as the brake shoes (2) are opened; the suction member (82) is connected to the surrounding member (81), and the surrounding member (81) is connected to the storage member (83).

2. The active return structure of automobile brake pad according to claim 1, characterized in that: The surrounding component (81) comprises a cooling box (811) and a sealing rubber sleeve (812); the cooling box (811) is sleeved on the outside of the return spring (7); the sealing rubber sleeve (812) is made of a retractable and foldable rubber material, and there are two groups of sealing rubber sleeves (812), which are respectively arranged on both sides of the cooling box (811); one side of the sealing rubber sleeve (812) is sealed and connected to the cooling box (811), and the other side is sealed and connected to the return spring (7).

3. The active return structure of automobile brake pad according to claim 2, characterized in that: The suction member (82) comprises a suction cylinder (822), a piston (823), a connecting rod (824), a connecting block (825) and a connecting pipe (826); the connecting block (825) is fixedly connected to the brake shoe (2); the piston (823) is slidably connected to the suction cylinder (822), and two groups of pistons (823) are provided and symmetrically arranged in the suction cylinder (822); one end of the connecting rod (824) is fixedly connected to the piston (823), and the other end is rotatably connected to the connecting block (825); the suction cylinder (822) and the cooling box (811) are connected and communicated with each other through a connecting pipe (826).

4. The active return structure of the automobile brake pad according to claim 3 is characterized in that: The storage element (83) comprises an oil tank (831) and an air vent (832); the oil tank (831) is fixedly connected to the outside of the mounting plate (1), and the oil tank (831) is in a ring shape; the air vent (832) is fixedly connected to the top of the oil tank (831).

5. The active return structure of automobile brake pad according to claim 4, characterized in that: The oil tank (831) is also provided with a heat dissipation pipe (8311), a connecting piece (8312), a second connecting pipe (8313) and a fan blade (8314); the heat dissipation pipe (8311) is fixedly connected to the oil tank (831) via the connecting piece (8312), and the heat dissipation pipe (8311) is in a threaded form and is connected to the oil tank (831); the second connecting pipe (8313) is fixedly connected between the heat dissipation pipe (8311) and the cooling box (811); the fan blade (8314) is fixedly connected to the power shaft (4), and the fan blade (8314) is provided in a plurality of groups and is arrayed on the outer surface of the power shaft (4) with the axis of the power shaft (4) as the center.

6. The active return structure of the automobile brake pad according to claim 5, characterized in that: The connecting plates (8312) are provided in four groups, and are arranged in a circular array on the outer surface of the heat dissipation tube (8311) with the center of the heat dissipation tube (8311) as the center of the circle, and the connecting plates (8312) are made of heat-conducting metal material.

7. The active return structure of the automobile brake pad according to claim 6, characterized in that: The installation plate (1) is also provided with a through opening (11); the second connecting pipe (8313) can pass through the through opening (11) to be connected to the cooling box (811) and the heat dissipation pipe (8311).

8. The active return structure of automobile brake pad according to claim 7, characterized in that: The suction cylinder (822) is also provided with an injection assembly (9); the injection assembly (9) comprises a connecting pipe three (91), a pressure cylinder (92), a connecting pipe four (93) and a nozzle component (94); the pressure cylinder (92) is fixedly connected to the brake shoe (2); the connecting pipe three (91) is fixedly connected between the suction cylinder (822) and the pressure cylinder (92); the nozzle component (94) is fixedly connected to the brake shoe (2), and the nozzle component (94) is located above the rotating shaft (3); the connecting pipe four (93) is fixedly connected between the pressure cylinder (92) and the nozzle component (94); when the brake shoe (2) is opened, the pressure cylinder (92) compresses the gas, and when a threshold value is reached, the gas is discharged from the pressure cylinder (92) and sprayed out from the nozzle component (94).

9. The active return structure of automobile brake pad according to claim 8, characterized in that: The pressure cylinder (92) is further provided with a pressure plug (921), a one-way air valve (922) and an elastic member (923); the pressure plug (921) is slidably connected to the pressure cylinder (92); the one-way air valve (922) is fixedly connected to the center of the pressure plug (921); the elastic member (923) is fixedly connected between the pressure plug (921) and the pressure cylinder (92), and the elastic member (923) provides an upward thrust for the pressure plug (921).

10. The active return structure of automobile brake pad according to claim 9, characterized in that: The nozzle component (94) comprises an arc-shaped tube (941) and an air outlet (942); the arc-shaped tube (941) is fixedly connected to the brake shoe (2), and the arc-shaped tube (941) is in the form of an arc-shaped circular tube and is located above the rotating shaft (3); the air outlet (942) is fixedly connected to the arc-shaped tube (941), and the air outlet (942) is arranged in a plurality of groups and arranged in an arc array on the inner arc surface of the arc-shaped tube (941).

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