Brake performance testing device for simulating severe environment

Abstract

The invention relates to the technical field of testing devices, in particular to a brake performance testing device capable of simulating a severe environment, which comprises a frame body, comprising at least one first testing cavity for low-temperature testing, at least one second testing cavity for high-temperature testing, at least one third testing cavity for water spraying testing and at least one fourth testing cavity for sediment spraying testing; the brake mounting unit is used for fixing a brake assembly and a tire; the power unit is used for driving the tires to rotate; wherein the first test cavity is connected with the second test cavity through an air flow channel, and cold air flowing out of the first test cavity flows through the brake, absorbs heat, is heated and then enters the second test cavity. The brake performance testing device simulates the severe environment, and synchronously completes energy recovery and precise environment control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of testing devices, in particular to a brake performance testing device simulating harsh environments. BACKGROUND

[0002] With the development of the automobile industry towards high safety and high reliability, the performance of the brake system under extreme conditions has become the focus of the industry as the core component of vehicle active safety. Especially in the era of electric vehicles and intelligent driving, the brake needs to maintain stable performance under the coupling of multiple harsh environments such as extreme cold and snow, high temperature and desert, heavy rain and water, and sand and stone road surfaces. However, traditional laboratory testing methods are difficult to truly reproduce these complex conditions, resulting in problems such as cold start failure, thermal degradation, and mud invasion and jamming of the brake in actual use, causing safety hazards. International authoritative agencies statistics show that about 23% of brake system recall events are directly related to environmental adaptability defects that have not been fully verified.

[0003] The brake performance testing device of the prior art is usually tested for a single performance or it is difficult to change the test items, such as the brake performance testing devices disclosed in the patent documents with publication numbers CN220084314U and CN201811857U. The brake can only be tested for a single performance in the test cavity. If the test content is changed, the brake assembly needs to be disassembled, transported, and assembled between various test devices, which is low in efficiency and high in cost. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a brake performance testing device simulating harsh environments, which realizes multi-environment testing on an integrated platform and simultaneously completes energy recovery and precise environment control.

[0005] The above application purpose of the present application is achieved by the following technical solution: A brake performance testing device simulating harsh environments, comprising a frame, the frame is provided with: a plurality of test cavities, including at least one first test cavity for low temperature testing, at least one second test cavity for high temperature testing, at least one third test cavity for water spraying testing, and at least one fourth test cavity for mud and sand spraying testing; a brake mounting unit for fixing a brake assembly and a tire; a power unit for driving the tire to rotate; wherein the first test cavity and the second test cavity are connected through an air flow channel, and the cold air flowing out of the first test cavity enters the second test cavity after being heated and warmed up by the brake.

[0006] As an embodiment of the brake performance testing device for simulating severe environment disclosed by the application, a main heater is arranged in the airflow channel to heat the airflow.

[0007] As an embodiment of the brake performance testing device for simulating severe environment disclosed by the application, an auxiliary heater is arranged in the airflow channel downstream of the main heater.

[0008] As an embodiment of the brake performance testing device for simulating severe environment disclosed by the application, a wind volume regulating valve is arranged in the airflow channel.

[0009] As an embodiment of the brake performance testing device for simulating severe environment disclosed by the application, a refrigeration unit and a temperature sensor are arranged at the first testing cavity to generate and maintain a preset low-temperature environment.

[0010] As an embodiment of the brake performance testing device for simulating severe environment disclosed by the application, a water spraying pipe is communicated with the third testing cavity, and a water storage pool is communicated with the water spraying pipe. The fourth testing cavity is provided with a sand spraying pipe, and the sand spraying pipe is communicated with the sand storage pool.

[0011] As an embodiment of the brake performance testing device for simulating severe environment disclosed by the application, the water spraying pipe of the third testing cavity and the sand spraying pipe of the fourth testing cavity are communicated through a three-way valve.

[0012] As an embodiment of the brake performance testing device for simulating severe environment disclosed by the application, the three-way valve can make the water storage pool communicate with the water spraying pipe alone, can make the water storage pool communicate with the sand spraying pipe alone, and can make the water storage pool communicate with the water spraying pipe and the sand spraying pipe simultaneously.

[0013] As an embodiment of the brake performance testing device for simulating severe environment disclosed by the application, each of the testing cavities comprises a moving plate, the power unit is installed on the moving plate, a horizontal moving assembly is installed in the frame body, and the horizontal moving assembly is used to drive the moving plate to move.

[0014] As an embodiment of the brake performance testing device for simulating severe environment disclosed by the application, the horizontal moving assembly comprises a horizontal moving driving member installed on the frame body, and an output end of the horizontal moving driving member is fixedly connected with the moving plate.

[0015] In summary, the application has at least one of the following beneficial technical effects: 1. The test device disclosed by the application realizes independent or cooperative simulation of four kinds of harsh environments of low temperature, high temperature, water spraying and sand and mud spraying in a single device through the design of four independent test cavities embedded in the integrated frame, can simultaneously perform multiple performance tests, and greatly improves the test efficiency; more importantly, through the programming control of the control system on the sequence / combination of the cavities, the complex working conditions of the coupling of multiple environmental factors can be accurately reproduced; 2. The energy gradient utilization system of the cold and hot cavities of the test device disclosed by the application, the structural innovation that the first test cavity and the second test cavity are physically connected through an air flow channel, combined with a main heater, an auxiliary heater and an air volume regulating valve, improves the energy saving effect and temperature control precision 3. The design that the water spraying pipe and the sand spraying pipe of the test device disclosed by the application are connected through a three-way valve realizes on-demand switching of water, sand and mud, and through the switching of the three-way valve, water spraying and sand spraying tests can be performed independently, or the water flow of the water storage tank and the sand of the sand storage tank can be mixed to reproduce the working condition of a muddy road; 4. The test device disclosed by the application modularizes the test cavity, the dedicated environment generation system of each cavity works independently, and the test cavities have parallel test capability, thereby greatly improving the convenience of maintenance and the flexibility of expansion, and the number of cavities can be increased or decreased as needed. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a whole structure schematic diagram of an embodiment of the brake performance test device for simulating harsh environments disclosed by the application; Figure 2 is a structure schematic diagram of an embodiment of the brake performance test device for simulating harsh environments disclosed by the application; Figure 3 is a schematic diagram of an air flow channel of an embodiment of the brake performance test device for simulating harsh environments disclosed by the application; Figure 4 is a communication schematic diagram of a water storage tank and a sand storage tank of an embodiment of the brake performance test device for simulating harsh environments disclosed by the application.

[0017] REFERENCE NUMERALS: 1, frame; 11, brake mounting unit; 12, power unit; 2, test cavity; 21, first test cavity; 22, second test cavity; 23, third test cavity; 231, water spraying pipe; 232, water storage tank; 233, three-way valve; 24, fourth test cavity; 241, sand spraying pipe; 242, sand storage tank; 25, moving plate; 3, air flow channel; 31, main heater; 32, auxiliary heater; 33, air volume regulating valve; 4, horizontal moving assembly; 41, horizontal moving driving member. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] Please see Figures 1-4 This invention discloses a brake performance testing device for simulating harsh environments, comprising a frame 1, with multiple test chambers 2 inside the frame 1 for simulating different harsh environments individually or in combination; a brake mounting unit 11 for reliably fixing the brake assembly and tires under test; a power unit 12 for driving the tires to simulate actual driving conditions; and a control system for automatically monitoring, acquiring data, and controlling the entire testing process in a closed loop.

[0020] Among them, multiple test chambers 2 are the core areas for simulating different harsh environments. The multiple test chambers 2 are relatively independent of each other but can be linked or work together to achieve complex environment simulation. Specifically, the test chambers 2 include at least one first test chamber 21, at least one second test chamber 22, at least one third test chamber 23 and at least one fourth test chamber 24.

[0021] Specifically, the first test chamber 21 is dedicated to conducting low-temperature environment tests. The main function of this chamber is to generate and maintain a preset low-temperature environment to simulate the impact of frigid regions or high-altitude mountainous areas in winter on brake performance. Low-temperature environments significantly affect brake fluid viscosity, seal elasticity, the cold-state friction coefficient of friction materials, and the brittleness of metal components, making it a crucial factor in evaluating brake cold-start performance, low-temperature response speed, and low-temperature fade.

[0022] The second test chamber 22 is used for high-temperature environment testing. Its main function is to generate and precisely maintain a preset high-temperature environment to simulate the extreme thermal loads caused by continuous braking, high-speed braking, or tropical / desert regions. High-temperature environments can lead to a series of problems, including brake fluid boiling, vapor lock, thermal fade of friction materials, thermal cracking, brake disc thermal deformation, and accelerated aging of seals. It is a core component in evaluating the high-temperature stability, thermal fade resistance, and thermal fatigue life of brakes.

[0023] The third test chamber 23 is used for water spray environment testing. This chamber is mainly used to simulate driving conditions such as heavy rain, wading through water, or wet road surfaces. Its core function is to spray a controlled flow or mist of water, with controlled flow rate, pressure, temperature, and water quality, onto the brake assembly, especially the contact area between the brake disc / drum and the friction pads. The water spray test mainly evaluates the instantaneous effect of water on the brake friction coefficient, the speed of brake performance recovery, and potential problems such as corrosion, abnormal noise, and drag.

[0024] The fourth test chamber 24 is used for the mud and sand spraying test. This chamber is mainly used to simulate the working condition of the brake system when the vehicle is driving or braking on a contaminated road surface with mud, sand, dust, etc. The core function is to spray a mixture of mud and sand with a certain particle size distribution, concentration and humidity to the brake assembly. The mud and sand spraying test mainly evaluates the influence of mud and sand intrusion on the wear rate of the friction pair, the inducement of brake noise, the abrasion of sealing components, and the performance variation caused by the embedding of mud and sand particles in the friction material.

[0025] It should be emphasized that these chambers can be run individually to test the specific influence of a single harsh environmental factor on the brake; or through the arrangement of the control system, sequential or combined tests can be performed. For example: first low temperature test and then immediately spray water test to simulate the braking after snow melting weather in cold regions, or spray mud and sand test while high temperature test to simulate the hot and sandy environment in the desert, so as to more realistically simulate complex and coupled actual harsh working conditions and evaluate the comprehensive influence of the superposition of multiple environmental factors on the performance of the brake.

[0026] To achieve higher energy efficiency and more complex temperature control capability, the airflow passage 3 between the first test chamber 21 and the second test chamber 22 is physically connected. This design is used for energy recovery and temperature transition. Specifically, after the low temperature test, the cold air in the first test chamber 21 is not directly exhausted, but is directed to the second test chamber 22 through the airflow passage 3. During the flow through this passage, the cold air will first flow through the brake assembly and the tire installed in the passage. The brake assembly will generate a large amount of heat before or during the test. When the low-temperature airflow flows through the high-temperature brake surface and the rotating tire, it will absorb heat, causing the temperature of the airflow itself to rise significantly. This design cleverly uses the cold air generated by the low-temperature test as a "preheating airflow" for the high-temperature test, achieving step-by-step utilization of energy and effectively reducing the total energy input required to build a high-temperature environment, which is more energy-efficient and environmentally friendly.

[0027] To ensure that the air flowing into the second test chamber 22 reaches the precisely set high temperature target value, the airflow passage 3 is provided with a main heater 31 and an auxiliary heater 32. The main heater 31 provides the main heating power to further raise the air preheated by the brake to a range close to the target temperature. The auxiliary heater 32 is located downstream of or parallel to the main heater 31 and is mainly used for fine tuning and maintaining the temperature of the airflow. Its role is similar to that of a precision "temperature trimmer". Through the PID algorithm or more advanced adaptive control strategy of the control system, the power output of the auxiliary heater 32 is accurately adjusted according to the real-time temperature feedback signal to compensate for the influence of environmental temperature fluctuations, airflow disturbances or brake heat load changes, ensuring that the temperature fluctuation range of the high-temperature environment is strictly controlled within a tolerance of ±1°C or even smaller.

[0028] In order to achieve more precise environmental simulation and energy efficiency optimization, a flow regulating valve 33 is installed in the airflow channel 3. The valve is controlled by the control system and can continuously and steplessly adjust the flow of gas through the airflow channel 3 according to test requirements or energy efficiency management strategies. For example, increase the air volume when rapid heating is required, reduce the air volume to reduce energy consumption and improve temperature uniformity when maintaining a stable temperature, or close the connection of the airflow channel 3 when only low-temperature tests are performed and the high-temperature chamber is not working.

[0029] This design of connecting the cold and hot chambers through the airflow channel 3, combined with preheating, main heating, fine-tuning heating and air volume fine control, not only realizes the effective reuse of energy, but more importantly provides a highly dynamic and precise control means for the fluid environment around the brake, which can simulate various complex thermal environment scenarios from steady state to transient state such as rapid heating or cooling, greatly improving the realism and controllability of the test.

[0030] The third test chamber 23 is connected to a water spraying pipe 231, and the water spraying pipe 231 is connected to a water storage tank 232. The water storage tank 232 serves as the main water source and has a capacity that meets the requirements of long-term continuous water spraying tests. The water storage tank 232 can be equipped with a liquid level sensor to monitor the water level in real time. When the water level is low, an alarm is automatically triggered and emergency measures such as connecting an external water pipe for real-time water replenishment are taken. A water pump is installed at the water storage tank 232. The fourth test chamber 24 is provided with a sand spraying pipe 241, and the sand spraying pipe 241 is connected to a sand storage tank 242. The sand storage tank 242 stores standard test sand and can be designed with a conical or inclined bottom to prevent the sand from being hardened. The sand storage tank 242 can be equipped with a stirrer to maintain the flowability of the sand, and a sand delivery pump is installed at the sand storage tank 242.

[0031] To simulate muddy, marshy or sand-containing waterlogged road surfaces, the water spraying pipe 231 and the sand spraying pipe 241 are connected through a three-way valve 233 near the nozzles. The three-way valve 233 is an electric or pneumatic multi-way valve that can connect the water storage tank 232 and the water spraying pipe 231, or the water storage tank 232 and the sand spraying pipe 241.

[0032] In some possible ways, each test chamber 2 includes a moving plate 25 that serves as a movable base while fixing the power unit 12 and the brake mounting unit 11. A horizontal moving assembly 4 is installed in the frame 1 to drive the moving plate 25 to move. The horizontal moving assembly 4 includes a horizontal moving drive 41 installed on the frame 1, and the output end of the horizontal moving drive 41 is fixedly connected to the moving plate 25. The horizontal moving drive 41 can be a high-precision servo motor or a stepper motor.

[0033] When using the device, in the preparation stage, the brake assembly and the tire to be tested are fixed on the brake mounting unit 11, and the power unit 12 is fixed on the test bench 10, The control system presets test parameters, such as a low-temperature chamber target of-40°C, a high-temperature chamber target of 150°C, a water spray flow of 50 L / min, and a mud concentration of 30%. Then, each chamber is independently pre-environment. The first test chamber 21 starts the refrigeration unit to cool down, the second test chamber 22 starts the heater to preheat, the third test chamber 23 starts the water tank 232 to inject water, and the fourth test chamber 24 starts the sand tank 242 to stir mud and sand. Each test chamber performs the test. After the test is completed, the moving plate 25 returns to the initial position, each chamber stops running, and the control system generates a test report.

[0034] The embodiments of the specific implementation are the preferred embodiments of the application, and are not intended to limit the protection scope of the application. Therefore, any equivalent changes made according to the structure, shape, and principle of the application should be covered within the protection scope of the application.

Claims

1. A brake performance testing device simulating harsh environments, characterized in that, Includes a frame (1), wherein the frame (1) contains: Multiple test chambers (2) include at least one first test chamber (21) for low temperature testing, at least one second test chamber (22) for high temperature testing, at least one third test chamber (23) for water spray testing, and at least one fourth test chamber (24) for mud and sand spray testing. Brake mounting unit (11) is used to fix the brake assembly and tire; Power unit (12) for driving the tire to rotate; The first test chamber (21) and the second test chamber (22) are connected by an airflow channel (3). The cold air flowing out of the first test chamber (21) flows through the brake to absorb heat and rise in temperature before entering the second test chamber (22).

2. The brake performance testing device simulating harsh environments according to claim 1, characterized in that: The airflow channel (3) is equipped with a main heater (31) to heat the airflow.

3. The brake performance testing device simulating harsh environments according to claim 2, characterized in that: An auxiliary heater (32) is provided in the airflow channel (3), and the auxiliary heater (32) is located downstream of the main heater (31).

4. The brake performance testing device simulating harsh environments according to claim 3, characterized in that: The airflow channel (3) is equipped with an air volume regulating valve (33).

5. A brake performance testing device simulating harsh environments according to any one of claims 1-4, characterized in that: A refrigeration unit and a temperature sensor are provided at the first test chamber (21) to generate and maintain a preset low temperature environment.

6. The brake performance testing device simulating harsh environments according to claim 1, characterized in that: The third test chamber (23) is connected to a water spray pipe (231), and the water spray pipe (231) is connected to a water storage tank (232). The fourth test chamber (24) is equipped with a sand spray pipe (241), which is connected to the sand storage tank (242).

7. The brake performance testing device simulating harsh environments according to claim 6, characterized in that: The water spray pipe (231) of the third test chamber (23) and the sand spray pipe (241) of the fourth test chamber (24) are connected by a three-way valve (233).

8. The brake performance testing device simulating harsh environments according to claim 7, characterized in that: The three-way valve (233) allows the water storage tank (232) to be connected to the water spray pipe (231) alone, the three-way valve (233) allows the water storage tank (232) to be connected to the sand spray pipe (241) alone, and the three-way valve (233) allows the water storage tank (232) to be connected to the water spray pipe (231) and the sand spray pipe (241) simultaneously.

9. The brake performance testing device simulating harsh environments according to claim 1, characterized in that: Each of the test chambers (2) includes a movable plate (25), the power unit (12) is mounted on the movable plate (25), and a transverse component (4) is installed in the frame (1) to drive the movable plate (25) to move.

10. The brake performance testing device simulating harsh environments according to claim 9, characterized in that: The lateral movement assembly (4) includes a lateral movement drive (41) mounted on the frame (1), and the output end of the lateral movement drive (41) is fixedly connected to the moving plate (25).

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