A drum brake device for a truck

Abstract

The application relates to the technical field of braking devices, and discloses a drum brake device for a truck, which comprises a brake drum, the outer wall of the brake drum is fixedly connected with equidistantly arranged first induction magnets, a brake shoe assembly is arranged in the brake drum, the end, away from the brake drum, of the brake shoe assembly is fixedly connected with a back plate, a cooling device body is arranged on the outer wall of the brake drum and is fixedly connected with the back plate on one side of the back plate, a liquid groove is arranged in the middle of the cooling device body, a main water blocking block is arranged on the inner wall of the cooling device body on one side of the top end, and a groove is arranged in the middle of the main water blocking block. When the battery is not fully charged, the tire of the truck drives the brake drum to rotate during rotation, the rotation of the brake drum causes the large induction coil to cut the magnetic induction lines of the first induction magnets, and the battery is charged through the diode D2 and the chip.

Description

Technical Field

[0001] This invention relates to the field of braking device technology, and more specifically to a drum brake device for trucks. Background Technology

[0002] Drum brakes are currently the most commonly used and lowest-cost type of braking device, and also the most commonly used braking device for trucks. They reduce vehicle speed by having the brake shoes rub against the brake drum as the wheel rotates. When the brake pedal is pressed, the piston of the brake caliper in the brake shoe assembly pushes the brake shoes to rotate outward by a certain angle, causing the brake shoes to rub against the inner surface of the brake drum and generating sufficient friction to reduce the wheel speed, thereby achieving the purpose of braking.

[0003] Existing drum brakes generate a lot of heat during use due to friction, which reduces the braking performance of the drum brake. As the temperature gradually rises, the brake drum may even deform, seriously affecting the braking performance. This is especially true for trucks using drum brakes, where the long braking distance makes them more prone to high temperature problems. Therefore, this invention provides a fixed drum brake specifically for trucks. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a drum brake device for trucks to solve the problems existing in the background art.

[0005] This invention provides the following technical solution: a drum brake device for trucks, comprising a brake drum, with equidistantly arranged first induction magnets fixedly connected to the outer wall of the brake drum, a brake shoe assembly installed inside the brake drum, a back plate fixedly connected to the end of the brake shoe assembly away from the brake drum, a cooling device body installed on the outer wall of the brake drum, and the cooling device body located on one side of the back plate and fixedly connected to the back plate, a liquid tank opened in the middle of the cooling device body, a main water baffle block installed on the top side of the inner wall of the cooling device body, a groove provided in the middle of the main water baffle block, auxiliary water baffle blocks installed on both sides of the inner wall of the cooling device body, a large induction coil installed on the inner wall of the cooling device body located in the liquid tank, equidistantly arranged drain outlets opened on the inner wall of the cooling device body located symmetrically on the side of the main water baffle block, a connecting groove opened at the bottom of the cooling device body, a water tank connected to the connecting groove of the cooling device body via a water pipe, and an induction device body installed at the top of the inner wall of the cooling device body.

[0006] Furthermore, the water tank has an inner cavity groove in the middle, and a water inlet is connected to the outer end of the water tank. The inner cavity groove of the water tank is connected to the main body of the cooling device through a connecting groove using a water pipe. The main body of the sensing device has a movable groove inside, and a tension spring is fixedly connected to the top center of the movable groove of the sensing device. A second sensing magnet is movably engaged in the movable groove of the sensing device. Square small sensing coils are fixedly connected to the surface of the movable groove.

[0007] Furthermore, a chip is installed inside the back plate on the side near the liquid tank, a water pump is installed at the bottom of the water tank, the water pump at the bottom of the water tank supplies water to the drain outlet of the main body of the cooling device through a water pipe, a pressure sensor is installed at the bottom of the water tank, and a battery is installed inside the back plate.

[0008] Furthermore, a water spray plug is fixedly connected to the drain outlet, main water protection plates are provided on both sides of the main water baffle, secondary water protection plates are provided at both ends of the secondary water baffle, and a water baffle ring is fixedly connected to the top outer side of the main body of the cooling device.

[0009] Furthermore, the battery on the backplate is connected to a pressure sensor, and the pressure sensor is connected in series with a water level indicator light. The negative terminal of the backplate battery is connected to the negative terminal of the pressure sensor, the positive terminal of the backplate battery is connected to the chip, and the negative terminal of the backplate battery is connected to one end of a large induction coil. The other end of the large induction coil is connected in parallel with two diodes D1 and D2 with different current flows. The large induction coil is connected to the chip through the diodes. Both ends of the small square induction coil of the main body of the sensing device are connected to the chip. The negative terminal of the water pump in the water tank is connected to the negative terminal of the battery on the backplate, and the positive terminal of the water pump in the water tank is connected to the chip.

[0010] Furthermore, the second and first sensing magnets are permanent magnets, the large induction coil supplies power to the battery on the back panel during normal operation, the chip integrates a battery charging protection device for the back panel, and the chip integrates a current sensing control module.

[0011] The technical effects and advantages of this invention are as follows:

[0012] 1. In use, when the battery is not fully charged, the rotation of the truck's tires causes the brake drum to rotate. As the brake drum rotates, the large induction coil cuts the magnetic field lines of the first induction magnet, thereby charging the battery through the chip via diode D2. Once charging is complete, the chip controls the circuit at diode D2 of the large induction coil to be disconnected. At this point, the large induction coil can no longer cut the magnetic field lines of the first induction magnet, thus preventing resistance to the rotation of the brake drum.

[0013] 2. This invention utilizes the principle that when a truck wheel rotates, the rotation of the first sensing magnet in the brake drum causes the movable slot of the sensing device to undergo attraction and repulsion. As the rotational speed increases, the second sensing magnet gradually maintains a general range of motion, thereby generating current by cutting the magnetic lines of force of the movable slot through a small square sensing coil. The chip detects whether the change in the current is within a specified range. If it is within the specified range, it indicates that the truck is in a normal operating state. This includes situations where braking is required during truck movement. For example, when braking lightly with a small speed change, the current change is not significant, and the sensing device cannot be triggered. However, when braking suddenly... The moment the truck brakes are applied, the brake shoes of the brake shoe assembly press against the inner wall of the brake drum to decelerate. As the brake shoe assembly decelerates, the movable groove inside the sensing device loses its balance due to the sudden decrease in the speed of the brake drum. This sudden deceleration causes an increase in the current generated by the small square induction coil. As the change in current increases, the chip receives the information about the current change and controls the battery on the backplate to discharge through diode D1, thereby energizing the large induction coil. Since the inner wall of the liquid tank encased by the large induction coil is made of metal, it is equivalent to a hollow metal rod, generating a magnetic field. This magnetic field acts as a resistance to the brake drum, thus decelerating the vehicle.

[0014] 3. This invention also controls a water pump via a chip to spray water through the drain outlet. During spraying, the water cools the outer wall of the brake drum. As the brake drum rotates, water falls onto its outer wall, causing it to be diverted. Some water flows downwards due to gravity, contacting the secondary baffle near the drain outlet. The water is then blocked by the secondary baffle and falls into its groove, continuing to flow towards the outer wall of the brake drum for further cooling. Simultaneously, the rotation of the brake drum, combined with the inner wall of the cooling device, causes most of the water to flow along the inner wall to the main baffle. Upon reaching the main baffle, the water flows through its groove and, impacted by the water flowing along the inner wall of the cooling device, reaches the outer wall of the brake drum for further cooling. As the impacting water reaches the brake drum, it is again diverted, and the secondary baffle at the main baffle collects the diverted water, which then continues to cool the brake drum through its groove. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the water tank of the present invention.

[0017] Figure 3 This is a schematic diagram of the overall water explosion structure of the present invention.

[0018] Figure 4 This is a schematic diagram of the brake drum structure of the present invention.

[0019] Figure 5 This is a schematic diagram of the main structure of the cooling device of the present invention.

[0020] Figure 6 This is a front view of the cross-sectional structure of the cooling device of the present invention.

[0021] Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the structure at the location.

[0022] Figure 8 This is a schematic cross-sectional view of the liquid tank of the main body of the cooling device of the present invention.

[0023] Figure 9 This is a schematic diagram of the main water-retaining block structure of the present invention.

[0024] Figure 10 This is a schematic diagram of the auxiliary water-retaining block structure of the present invention.

[0025] Figure 11 This is a schematic diagram of the square induction coil structure of the present invention.

[0026] Figure 12 This is a schematic diagram of the drainage outlet structure of the present invention.

[0027] Figure 13 This is a schematic diagram of the water spray plug structure of the present invention.

[0028] Figure 14 This is a schematic diagram of the overall circuit structure of the present invention.

[0029] The attached figures are labeled as follows: 1. Brake drum; 101. First induction magnet; 102. Brake shoe assembly; 2. Cooling device body; 201. Liquid tank; 2011. Connecting groove; 202. Main water baffle; 2021. Main water protection plate; 203. Secondary water baffle; 2031. Secondary water protection plate; 204. Large induction coil; 205. Drain outlet; 2051. Water spray plug; 206. Water baffle ring; 3. Back plate; 4. Water tank; 401. Inner cavity groove; 402. Water injection end; 5. Induction device body; 501. Movable groove; 502. Tension spring; 503. Square small induction coil; 504. Second induction magnet. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The drum brake device for trucks involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Reference Figure 1-14 This invention provides a drum brake device for trucks, comprising a brake drum 1, with equidistantly arranged first induction magnets 101 fixedly connected to the outer wall of the brake drum 1, a brake shoe assembly 102 installed inside the brake drum 1, a back plate 3 fixedly connected to the end of the brake shoe assembly 102 away from the brake drum 1, a cooling device body 2 installed on the outer wall of the brake drum 1, and the cooling device body 2 located on one side of the back plate 3 and fixedly connected to the back plate 3, a liquid tank 201 opened in the middle of the cooling device body 2, a main water baffle 202 installed on the inner wall of the cooling device body 2 at the top, the main water baffle 202 having a groove in the middle, auxiliary water baffles 203 installed on both sides of the inner wall of the cooling device body 2, a large induction coil 204 installed on the inner wall of the cooling device body 2 located in the liquid tank 201, and an opening on the inner wall of the cooling device body 2 on the symmetrical side of the main water baffle 202. The device has equidistantly arranged drain outlets 205. A connecting groove 2011 is provided at the bottom of the cooling device body 2. The connecting groove 2011 of the cooling device body 2 is connected to a water tank 4 through a water pipe. A sensing device body 5 is installed at the top of the inner wall of the cooling device body 2. An inner cavity groove 401 is provided in the middle of the water tank 4. The inner cavity groove 401 of the water tank 4 is connected to the cooling device body 2 through the connecting groove 2011 and a water pipe. A movable groove 501 is provided inside the sensing device body 5. A tension spring 502 is fixedly connected to the top center of the movable groove 501 of the sensing device body 5. A second sensing magnet 504 is movably engaged in the movable groove 501 of the sensing device body 5. A square sensing coil 503 is fixedly connected to the surface of the movable groove 501. The square shape of the square sensing coil 503 allows it to adapt to the shape of the sensing device body 5.

[0032] The backplate 3 has a chip inside the side near the liquid tank 201, the bottom of the water tank 4 has a water pump, the water pump at the bottom of the water tank 4 supplies water to the drain port 205 of the cooling device body 2 through a water pipe, the bottom of the water tank 4 has a pressure sensor, and the backplate 3 has an electrical component.

[0033] The battery on backplate 3 is connected to a pressure sensor, which is also connected in series with a water level indicator light. The negative terminal of the battery on backplate 3 is connected to the negative terminal of the pressure sensor, and the positive terminal of the battery on backplate 3 is connected to the chip. The negative terminal of the battery on backplate 3 is connected to one end of the large induction coil 204. The large induction coil 204 is positioned at the drain outlet 205 to facilitate connection between the water pump pipe and the drain outlet 205. The other end of the large induction coil 204 is connected in parallel to two diodes D1 and D2, each with a different current flow direction. The large induction coil 204 is connected to the chip through the diodes. Both ends of the square induction coil 503 of the main body 5 of the device are connected to the chip. The negative terminal of the water pump of the water tank 4 is connected to the negative terminal of the battery of the back plate 3, and the positive terminal of the water pump of the water tank 4 is connected to the chip. The pressure sensor is MS5803-14BA. By utilizing the characteristic that the greater the pressure of the pressure sensor, the smaller the resistance, and by utilizing the characteristics of the series circuit, the resistance of MS5803-14BA decreases, and the water level indicator light brightens, indicating that there is enough water in the water tank 4. Conversely, the resistance of MS5803-14BA increases, and the water level indicator light dims, indicating that there is less water.

[0034] A water spray plug 2051 is fixedly connected to the drain outlet 205. Main water protection plates 2021 are provided on both sides of the main water baffle 202. Auxiliary water protection plates 2031 are provided at both ends of the auxiliary water baffle 203. A water baffle ring 206 is fixedly connected to the top of the outer side of the main body 2 of the cooling device. The water baffle ring 206 can concentrate the water flow on the outer wall of the brake drum 1, thereby increasing the efficiency of cooling water use and reducing splashing water flow.

[0035] Among them, the second induction magnet 504 and the first induction magnet 101 are permanent magnets. The large induction coil 204 supplies power to the battery of the back plate 3 during normal driving. The chip integrates the battery charging protection device of the back plate 3 and the current sensing control module. The large induction coil 204 is equivalent to the coil of the generator, and the first induction magnet 101 of the brake drum 1 is equivalent to the rotor of the generator. Thus, when the brake drum 1 rotates, it can supply power to the battery of the back plate 3. When the battery of the back plate 3 discharges, the large induction coil 204 in the original generator structure will form an electromagnet with the inner wall of the liquid tank 201 of the cooling device body 2, thereby increasing the braking force. The large induction coil 204 is made of wire wrapped with a waterproof insulation layer and has a gap left at the drain outlet 205.

[0036] Working principle of the invention:

[0037] When the truck is in normal operation, initially, when the battery is not fully charged, the rotation of the truck's tires causes the brake drum 1 to rotate. As the brake drum 1 rotates, the large induction coil 204 cuts the magnetic field lines of the first induction magnet 101, thus charging the battery via diode D2 and the chip. Once charging is complete, the chip controls the circuit at diode D2 in the large induction coil 204 to disconnect, preventing the large induction coil 204 from cutting the magnetic field lines of the first induction magnet 101. Simultaneously, when the truck wheels rotate, the rotation of the first induction magnet 101 in the brake drum 1 causes the movable groove 501 of the sensing device body 5 to move relative to the first induction magnet 101. During rotation, adsorption and repulsion occur. As the rotation speed increases, the second induction magnet 504 gradually maintains a general range of motion, thereby cutting the magnetic field lines of the movable slot 501 through the square induction coil 503 to generate current. At this time, the chip senses whether the change in current is within the specified range. If it is within the specified range, it indicates that the truck is in a normal operating state. This includes when the truck needs to use the brakes during movement. The situation is divided according to the circumstances. When the brake is applied lightly and the speed change is small, the current change is not large, and the sensing device body 5 cannot be triggered. When the brake is applied hard, at the moment the truck brake is pressed, the brake shoes of the brake shoe assembly 102 will press tightly against the inner wall of the brake drum 1 to decelerate. As the brake shoe assembly 102... 02. During deceleration, the movable slot 501 inside the main body 5 of the sensing device loses its balance due to the sudden decrease in speed of the brake drum 1. This sudden deceleration causes an increase in the current generated by the small square induction coil 503. As this change increases, the chip receives the current change information and controls the battery on the backplate 3 to discharge through diode D1, thereby energizing the large induction coil 204. Since the inner wall of the liquid tank 201 enclosed by the large induction coil 204 is made of metal, essentially a hollow metal rod, it generates a magnetic field, which at this time creates resistance to the brake drum 1. Simultaneously, the chip controls the water pump to pump water from the water tank 4 through the connecting slot 2011. The liquid tank 201 transports water, and as the water volume in the tank increases, the pressure rises, causing water to be sprayed through the spray plug 2051 at the drain outlet 205. This spraying dissipates heat from the outer wall of the brake drum 1. During this cooling process, the rotation of the brake drum 1 causes water to fall onto its outer wall, diverting the water flow. Some water flows downwards due to gravity, contacting the auxiliary water baffle 203 near the drain outlet 205, along with the auxiliary water guard plate 2031. The water is then blocked by the auxiliary water baffle 203 and the auxiliary water guard plate 2031, causing it to fall into the groove of the auxiliary water baffle 203 and continue flowing towards the outer wall of the brake drum 1 for continued cooling.As the brake drum 1 rotates, the water flow, along with the inner wall of the cooling device body 2, causes most of the water to flow along the inner wall of the cooling device body 2 to the main water baffle 202. Upon reaching the main water baffle 202, the water passes through the grooves of the main water baffle 202 and the main water protection plate 2021, and simultaneously through the water baffle ring 206. With the impact of the water flow along the inner wall of the cooling device body 2, the water reaches the outer wall of the brake drum 1, thus dissipating heat. After reaching the brake drum 1, the water flow is diverted, and the secondary water baffle 203 at the main water baffle 202 continues to collect the diverted water, which then continues to dissipate heat from the brake drum 1 through the grooves.

[0038] After braking, there are two situations: one is stopping after braking, and the other is continuing to drive after braking. When stopping after braking, the second sensing magnet 504 and the first sensing magnet 101 will be attracted to each other magnetically, causing the movable slot 501 to approach the lower end of the tension spring 502 of the sensing device body 5. When the magnets repel each other, the movable slot 501 will move away from the lower end of the tension spring 502 of the sensing device body 5, thereby stopping the second sensing magnet 504 from generating current, so that the chip receives information and stops the water pump from continuing to dissipate heat.

[0039] When the water level indicator light on water tank 4 is dim or even off, it indicates that the pressure sensor is at a low pressure. When the pressure sensor is at a low pressure, its resistance is high, which causes the water level indicator light on water tank 4 to dim or even go off. As the indicator light on water tank 4 dims or goes off, it indicates that the water in water tank 4 is low. When the water in water tank 4 is full, the pressure sensor is at a high pressure, so its resistance is low. This will cause the indicator light on water tank 4 to light up due to the properties of the series circuit, thus informing the user that the water in water tank 4 is full.

[0040] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drum brake device for trucks, comprising a brake drum (1), characterized in that: The outer wall of the brake drum (1) is fixedly connected with equidistantly arranged first induction magnets (101). The brake drum (1) is equipped with a brake shoe assembly (102). The brake shoe assembly (102) is fixedly connected to a back plate (3) at one end away from the brake drum (1). The outer wall of the brake drum (1) is equipped with a cooling device body (2), and the cooling device body (2) is located on one side of the back plate (3) and fixedly connected to the back plate (3). A liquid tank (201) is opened in the middle of the cooling device body (2). A main water baffle (202) is installed on the inner wall of the cooling device body (2) at the top. A groove is provided in the middle of the main water baffle (202). A secondary water baffle (203) is installed on both sides of the inner wall of the cooling device body (2). A large induction coil (204) is installed on the inner wall of the cooling device body (2) at the liquid tank (201). Equidistantly arranged rows of magnets are opened on the inner wall of the cooling device body (2) on the symmetrical side of the main water baffle (202). The cooling device body (2) has a drain outlet (205) and a connecting groove (2011) at the bottom. The connecting groove (2011) of the cooling device body (2) is connected to a water tank (4) via a water pipe. The top of the inner wall of the cooling device body (2) is equipped with a sensing device body (5). The water tank (4) has an inner cavity groove (401) in the middle. The water tank (4) has a water inlet end (402) connected to the outer side of the water tank (4). The inner cavity groove (401) of the water tank (4) has a water inlet end (402) connected to the outer side of the water tank (4). 01) The main body of the cooling device (2) is connected to the main body of the sensing device (2) by a water pipe through a connecting groove (2011). The main body of the sensing device (5) has an open movable groove (501) inside. A tension spring (502) is fixedly connected to the top center of the movable groove (501) of the main body of the sensing device (5). A second sensing magnet (504) is movably engaged in the movable groove (501) of the main body of the sensing device (5). A square small sensing coil (503) is fixedly connected to the surface of the movable groove (501).

2. A drum brake device for trucks according to claim 1, characterized in that: The back plate (3) has a chip inside on the side near the liquid tank (201), the bottom of the water tank (4) has a water pump, the water pump at the bottom of the water tank (4) supplies water to the drain outlet (205) of the cooling device body (2) through a water pipe, the bottom of the water tank (4) has a pressure sensor, and the back plate (3) has a battery installed inside.

3. A drum brake device for trucks according to claim 1, characterized in that: A water spray plug (2051) is fixedly connected to the drain outlet (205). A main water protection plate (2021) is provided on both sides of the main water baffle (202). A secondary water protection plate (2031) is provided at both ends of the secondary water baffle (203). A water baffle ring (206) is fixedly connected to the top of the outer side of the main body (2) of the cooling device.

4. A drum brake device for trucks according to claim 1, characterized in that: The battery of the backplate (3) is connected to the pressure sensor, and the pressure sensor is connected in series with the water level indicator light. The negative terminal of the battery of the backplate (3) is connected to the negative terminal of the pressure sensor. The positive terminal of the battery of the backplate (3) is connected to the chip. The negative terminal of the battery of the backplate (3) is connected to one end of the large induction coil (204). The other end of the large induction coil (204) is connected in parallel with two diodes D1 and D2 with different current flows. The large induction coil (204) is connected to the chip through the diode. Both ends of the square induction coil (503) of the main body of the sensing device (5) are connected to the chip. The negative terminal of the water pump of the water tank (4) is connected to the negative terminal of the battery of the backplate (3). The positive terminal of the water pump of the water tank (4) is connected to the chip.

5. A drum brake device for trucks according to claim 3, characterized in that: The second induction magnet (504) and the first induction magnet (101) are permanent magnets. The large induction coil (204) supplies power to the battery of the back plate (3) during normal driving. The chip integrates the battery charging protection device of the back plate (3) and the chip integrates the current sensing control module.

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