Dry-type bridge brake fluid cooling system

Abstract

The utility model discloses a dry-type bridge brake fluid cooling system, and belongs to the technical field of engineering machinery. The defects that in the prior art, due to the fact that a heat dissipation gap is additionally formed in the middle of a traditional brake disc, the brake response speed and performance are poor, and the heat dissipation effect is poor are overcome. The main structure of the brake system comprises a booster pump, a brake caliper, a brake fluid heat exchanger used for reducing the temperature of brake fluid and a radiator used for reducing the temperature of cooling liquid, a fluid outlet of the booster pump is connected with a brake fluid inlet in the brake fluid heat exchanger, and a brake fluid outlet in the brake fluid heat exchanger is connected with the brake caliper. The radiator is connected with a heat exchanger water inlet and a heat exchanger water outlet of the brake fluid heat exchanger through a water circulation driving device. The utility model is mainly applied to large-tonnage loaders.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery technology, and more specifically, it relates to a dry axle brake fluid cooling system. Background Technology

[0002] Loaders are widely used in loading and unloading operations due to their high mobility and efficiency. Braking performance is a key safety feature of loaders. Based on whether the friction pads are immersed in hydraulic fluid, braking systems can be divided into dry braking and wet braking. Dry braking systems include air-jacking hydraulic caliper disc brakes and hydraulic-jacking hydraulic caliper disc brakes. Air-jacking hydraulic caliper disc brakes are widely used due to their simple structure, light weight, and ease of maintenance.

[0003] The existing air-jack hydraulic disc brake system consists of an air compressor, an oil-water separator combination valve, an air tank, an air brake valve, a booster pump, brake calipers, and related pipelines. The air compressor provides compressed gas driven by the engine, which is dried by the oil-water separator and stored in the air tank. The entire machine controls the air pressure entering the brake pipeline through the foot brake valve. The booster pump amplifies the force by a pneumatic piston, pushing the hydraulic brake piston to press the brake friction pads against the brake disc, generating friction torque to brake and achieve vehicle speed control.

[0004] When loaders frequently start and stop loading operations and brake continuously on slopes, the prolonged friction time between the brake disc and caliper, the resulting high-temperature heat transfer, and the continuous work done by the system on the brake fluid can all cause the brake fluid to overheat. Most air-jack hydraulic caliper disc brake loaders generally lack forced cooling because, under normal circumstances, passive cooling is sufficient to meet the braking performance requirements under frequent start-stop conditions. However, for large-tonnage loaders, due to their greater mass, efficient, frequent start-stop loading operations or continuous downhill driving can lead to excessively high brake fluid temperatures, brake system instability, or even complete failure. In these cases, passive cooling is insufficient to meet the braking performance requirements under frequent start-stop conditions.

[0005] To meet the braking performance requirements of large-tonnage air-jack hydraulic disc brake loaders under frequent start-stop conditions, existing technologies employ the following heat dissipation methods: 1) Adding a heat dissipation gap in the middle of the brake disc to enhance heat dissipation; 2) Increasing the cross-sectional area or length of a section of the brake fluid pipeline to increase heat dissipation; 3) Using compressed air to directly force cooling the brake disc and filter, such as the air-cooled brake cooling system and loader disclosed in Chinese invention patent application publication number CN110588600A. However, the shortcomings of the above-mentioned existing technologies are:

[0006] 1. Increasing the heat dissipation gap in the brake disc will reduce the brake disc temperature, but it will also significantly reduce the strength of the brake disc; 2. Increasing the heat dissipation by increasing the cross-sectional area or length of a section of brake fluid line may affect the braking response speed and performance, and both of these methods are essentially passive heat dissipation with limited cooling effect; 3. Using compressed air to directly cool the brake disc and filter requires the installation of air nozzles, pipes and other components near the brake disc, which is inconvenient to install. Once damaged, it poses a safety hazard and is easily limited by installation space. Utility Model Content

[0007] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a dry axle brake fluid cooling system.

[0008] To achieve the above objectives, this utility model employs the following technical solution:

[0009] A dry axle brake fluid cooling system includes a booster pump, a brake caliper, a brake fluid heat exchanger for reducing brake fluid temperature, and a radiator for reducing coolant temperature. The outlet of the booster pump is connected to the brake fluid inlet on the brake fluid heat exchanger, and the brake fluid outlet on the brake fluid heat exchanger is connected to the brake caliper. The radiator is connected to the heat exchanger inlet and outlet of the brake fluid heat exchanger via a water circulation drive device.

[0010] Preferably, the brake fluid heat exchanger includes brake fluid heat exchanger A and brake fluid heat exchanger B, with the brake fluid outlet on brake fluid heat exchanger A connected to the brake caliper on the front axle, and the brake fluid outlet on brake fluid heat exchanger B connected to the brake caliper on the rear axle.

[0011] Preferably, both brake fluid heat exchanger A and brake fluid heat exchanger B are equipped with temperature sensors for detecting brake fluid temperature.

[0012] Preferably, the brake fluid heat exchanger is provided with a spiral brake fluid pipe, and the two ends of the brake fluid pipe are respectively connected to the brake fluid inlet and the brake fluid outlet.

[0013] Preferably, the water circulation drive device is a circulating water pump, and the circulating water pump is installed on the rear frame of the whole machine.

[0014] Preferably, the water circulation drive device is disposed between the radiator and the dynamic fluid heat exchanger A or between the radiator and the brake fluid heat exchanger B.

[0015] Preferably, the air inlet of the booster pump is connected to an air brake valve.

[0016] Preferably, the brake caliper is clamped onto the brake disc.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. A high-pressure brake fluid heat exchanger is used because the pressure of the entire braking system is about 12MPa, which is generally insufficient for the braking requirements of a radiator. Therefore, a high-pressure heat exchanger is used to solve the problem of excessively high braking system pressure and to ensure that the braking system pressure does not affect the braking effect.

[0019] 2. The brake fluid heat exchanger differs from existing heat exchangers in that its internal brake fluid pipes are spiral-shaped, and it uses materials with good heat exchange performance to withstand high pressure. Existing heat exchangers change the liquid flow rate by changing the internal pipe diameter, while the brake fluid heat exchanger of this invention does not change the liquid pipe diameter as much as possible, but increases the heat dissipation area by increasing the length.

[0020] 3. The brake fluid heat exchanger is cooled by an independent brake cooling water circulation system. The operation of the brake circulation water pump is controlled by the brake fluid temperature. When the brake fluid temperature is low, the circulation water pump does not start, effectively reducing energy waste. When the brake temperature reaches the heat dissipation requirement, low-speed circulation is started. The higher the temperature, the faster the cooling pump speed.

[0021] 4. Brake fluid heat exchangers are used for the front and rear axle braking systems respectively, which can effectively cool down the high temperature brake fluid. After the brake fluid is cooled down, the reliability of the heat dissipation system can be improved and the heat exchangers can be kept in good condition.

[0022] 5. This utility model can achieve forced heat dissipation of the braking system of the whole machine without changing the pressure of the whole machine braking system, without changing the original structure of the braking pipeline, without affecting the braking response time, and can effectively reduce the braking temperature and improve the reliability of the whole machine braking system.

[0023] 6. It has a wide range of applications, not only suitable for air-jack hydraulic disc brakes, but also for fully hydraulic disc brakes;

[0024] In summary, this invention utilizes the forced cooling method of circulating coolant to remove heat from the brake fluid in the brake fluid heat exchanger. Furthermore, the circulation efficiency of the water circulation can be controlled according to the coolant temperature; the higher the temperature, the faster the circulation, resulting in a significant cooling effect. It is energy-efficient and effectively reduces brake fluid temperature, thereby improving braking reliability. It is suitable for dry axle loaders, especially large-tonnage loaders. Attached Figure Description

[0025] Figure 1 This is a system schematic diagram of the present invention;

[0026] Figure 2 This is a schematic diagram showing the connections of the various parts in this utility model;

[0027] Figure 3 This is a schematic diagram of the internal structure of the brake fluid heat exchanger in this utility model.

[0028] In the diagram: 1. Air brake valve; 2. Power pump; 3. Brake fluid heat exchanger A; 4. Brake disc; 5. Brake caliper; 6. Radiator; 7. Water circulation drive device; 8. Temperature sensor; 9. Brake fluid heat exchanger B; 10. Brake fluid pipeline; 11. Heat exchanger inlet; 12. Brake fluid inlet; 13. Brake fluid outlet; 14. Heat exchanger outlet. Detailed Implementation

[0029] The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings.

[0030] Example 1:

[0031] like Figure 1-2 As shown, a dry axle brake fluid cooling system includes a booster pump 2, a brake caliper 5, a brake fluid heat exchanger for reducing brake fluid temperature, and a radiator 6 for reducing coolant temperature. The outlet of the booster pump 2 is connected to the brake fluid inlet 12 on the brake fluid heat exchanger, and the brake fluid outlet 13 on the brake fluid heat exchanger is connected to the brake caliper 5. The radiator 6 is connected to the heat exchanger inlet 11 and heat exchanger outlet 14 of the brake fluid heat exchanger via a water circulation drive device 7.

[0032] In this embodiment, during the braking process of the entire machine, when the brake fluid is at a high temperature, the machine's electronic control unit detects that the brake fluid needs to dissipate heat through the temperature sensor 8, sends a command to start the water circulation drive device 7, and diverts the coolant inside the brake fluid heat exchanger wrapped around the brake fluid pipe to the radiator 6 for heat dissipation. After heat dissipation, it returns to the brake fluid heat exchanger, thereby removing some of the heat from the brake fluid, reducing the brake fluid temperature, and ensuring that the braking performance of the entire machine meets the usage requirements.

[0033] Example 2:

[0034] A dry axle brake fluid cooling system differs from Embodiment 1 in that the brake fluid heat exchanger includes brake fluid heat exchanger A3 and brake fluid heat exchanger B9. The brake fluid outlet 13 on brake fluid heat exchanger A3 is connected to the brake caliper 5 on the front axle, and the brake fluid outlet 13 on brake fluid heat exchanger B9 is connected to the brake caliper 5 on the rear axle. Furthermore, the brake fluid heat exchanger is equipped with a spiral-shaped brake fluid pipe 10, such as... Figure 3 As shown, the two ends of the brake fluid pipe 10 are connected to the brake fluid inlet 12 and the brake fluid outlet 13, respectively.

[0035] In this embodiment, the brake fluid heat exchangers A3 and B9 are elongated cylindrical bodies with the brake fluid pipe 10 passing through the middle. Their internal structure differs significantly from existing heat exchangers, featuring a spiral shape and utilizing materials with good heat exchange performance to withstand high pressure. While existing heat exchangers alter the internal pipe diameter to change the fluid flow rate, the brake fluid heat exchangers A3 and B9 in this invention minimize the change in pipe diameter, increasing the heat dissipation area by extending their length. Because the brake fluid pipe 10 is spiral-shaped within the cylindrical body, the heat dissipation area is increased, and the remaining areas are filled with coolant. Their primary function is heat exchange between the high-temperature brake fluid and the low-temperature water cooling system.

[0036] In addition, the design dimensions of brake fluid heat exchangers A3 and B9 are less than or equal to the length of the overall radiator, and their thickness is the same as that of the overall radiator, in order to facilitate their placement inside the engine cover.

[0037] Furthermore, both brake fluid heat exchanger A3 and brake fluid heat exchanger B9 are equipped with temperature sensors 8 for detecting brake fluid temperature. When the temperature sensor 8 detects that the internal temperature of the brake fluid heat exchanger is higher than a certain set value, the water circulation drive device 7 is turned on. The hot water medium is rapidly cooled by the radiator 6. Through the heat exchange of the brake fluid with the coolant in the brake fluid heat exchanger, the purpose of reducing the overall brake fluid temperature is achieved. When the temperature sensor 8 is lower than the set temperature, the water circulation drive device 7 is not turned on; when it is higher than the set temperature, the water circulation drive device 7 is turned on.

[0038] Furthermore, a water circulation drive device 7 is installed between the radiator 6 and the dynamic fluid heat exchanger A3 or between the radiator 6 and the brake fluid heat exchanger B9. The water circulation drive device 7 includes a circulating water pump and pipelines, and the circulating water pump is installed on the rear frame of the vehicle. Cooling water flowing out from the brake fluid heat exchanger A3 and the brake fluid heat exchanger B9 passes through the circulating water pump, connects to the coolant filling device, and then connects to the water inlet of the brake fluid heat exchanger A3 and the brake fluid heat exchanger B9, forming a water cooling circulation system. The function of the water circulation drive device 7 is to circulate the water in the radiator 6, ensuring the power during water circulation. Specifically, the water circulation uses the brake fluid temperature to control the opening of the circulating water pump. When the brake fluid temperature is less than T1℃, the circulating water pump does not start, effectively reducing energy waste. When the brake fluid temperature reaches the heat dissipation requirement, low-speed circulation starts. The higher the temperature, the faster the radiator pump speed.

[0039] The water circulation drive device 7 has an opening temperature of T0±a℃ and an closing temperature of T0-20±a℃ to ensure the cooling effect of the brake fluid. Furthermore, the circulating water pump employs multi-speed control: when the brake fluid temperature is greater than T1±b℃, the pump operates at its first-stage speed; when the temperature is greater than T2±b℃, the pump operates at its second-stage speed, and so on. Here, T0 refers to the brake fluid's initial cooling temperature, which is the same as the opening temperature of the water circulation drive device 7; T1 refers to the brake fluid's cooling temperature, which is approximately 30℃ higher than T0, both for energy saving and to ensure effective brake fluid cooling.

[0040] Furthermore, the air inlet of the booster pump 2 is connected to an air brake valve 1.

[0041] Furthermore, the main function of the brake disc 4 is to transmit braking force to the drive axle, achieving the braking effect of the drive axle. During braking, the heat generated by the friction between the brake disc 4 and the brake caliper 5 is transferred to the brake fluid; while the brake caliper 5 pushes the brake disc 4 through the piston, it also transfers heat during braking, increasing the temperature of the brake fluid. The brake caliper 5 clamps onto the brake disc 4, and when the brake pedal is pressed, the speed is reduced through friction. There are two brake fluid heat exchangers, A3 located on the front axle and B9 located on the rear axle, which are wrapped around the brake fluid pipes. Since the temperature sensor 8 is located inside the brake fluid heat exchanger, it can be used to detect the brake fluid temperature; the water circulation drive device 7 drives the coolant in the brake fluid heat exchanger to the radiator 6, and then sends the cooled coolant back to the brake fluid heat exchanger to achieve water circulation.

[0042] The working principle of this utility model is as follows:

[0043] During the loading and unloading operation, the large-tonnage loader loads a large amount of material, has high inertia, and a long braking time. Therefore, the machine generates a lot of heat by working on the brake fluid, and the friction between the brake disc 4 and the brake caliper 5 also generates a lot of heat. The combination of these two factors causes the brake fluid to heat up rapidly. When the temperature reaches a certain value, the temperature sensor 8 in the brake fluid heat exchanger A3 and brake fluid heat exchanger B9 transmits the high temperature signal to the machine's electronic control unit. At this time, the machine's electronic control unit sends a command, and the water circulation drive device 7 starts the brake water cooling circulation system. The brake fluid heat exchanger A3 and brake fluid heat exchanger B9 exchange heat with the coolant in the radiator 6, reducing the temperature of the brake fluid and thus ensuring the normal braking function of the braking system.

[0044] Alternatively, the radiator 6 can be independent and located inside the water tank of the whole machine, connected to the water circulation pipeline of the heat exchanger; or it can be integrated into the radiator of the whole machine, and the cooling method of the radiator 6 is the blowing of air by the whole machine fan.

[0045] In addition, the whole machine brake heat exchange uses water circulation cooling, or hydraulic oil circulation cooling can be used instead to achieve the purpose of cooling; and the power source of the water circulation drive device 7 can be the circulation pressure of the engine water, i.e., the circulating water pump, or the return oil pressure of the hydraulic system radiator.

Claims

1. A dry axle brake fluid cooling system, characterized in that: It includes a booster pump (2), a brake caliper (5), a brake fluid heat exchanger for reducing the temperature of the brake fluid, and a radiator (6) for reducing the temperature of the coolant. The outlet of the booster pump (2) is connected to the brake fluid inlet (12) on the brake fluid heat exchanger, and the brake fluid outlet (13) on the brake fluid heat exchanger is connected to the brake caliper (5). The radiator (6) is connected to the heat exchanger inlet (11) and heat exchanger outlet (14) of the brake fluid heat exchanger respectively through a water circulation drive device (7).

2. The dry axle brake fluid cooling system according to claim 1, characterized in that: The brake fluid heat exchanger includes brake fluid heat exchanger A (3) and brake fluid heat exchanger B (9). The brake fluid outlet (13) on brake fluid heat exchanger A (3) is connected to the brake caliper (5) on the front axle, and the brake fluid outlet (13) on brake fluid heat exchanger B (9) is connected to the brake caliper (5) on the rear axle.

3. The dry axle brake fluid cooling system according to claim 2, characterized in that: Both the brake fluid heat exchanger A (3) and the brake fluid heat exchanger B (9) are equipped with temperature sensors (8) for detecting the brake fluid temperature.

4. The dry axle brake fluid cooling system according to claim 1, characterized in that: The brake fluid heat exchanger is provided with a spiral brake fluid pipe (10), and the two ends of the brake fluid pipe (10) are connected to the brake fluid inlet (12) and the brake fluid outlet (13) respectively.

5. The dry axle brake fluid cooling system according to any one of claims 1-4, characterized in that: The water circulation drive device (7) is a circulating water pump, and the circulating water pump is installed on the rear frame of the whole machine.

6. The dry axle brake fluid cooling system according to any one of claims 1-4, characterized in that: The water circulation drive device (7) is located between the radiator (6) and the dynamic liquid heat exchanger A (3) or between the radiator (6) and the brake fluid heat exchanger B (9).

7. The dry axle brake fluid cooling system according to any one of claims 1-4, characterized in that: The air inlet of the booster pump (2) is connected to an air brake valve (1).

8. The dry axle brake fluid cooling system according to any one of claims 1-4, characterized in that: The brake caliper (5) is clamped on the brake disc (4).

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