Brake testing method and brake testing stand

Abstract

The embodiment of the application provides a brake test method and a brake test bench, and relates to the technical field of brake test, wherein the brake test bench comprises a base, a hydraulic cylinder arranged on the base and a measured brake; and a push rod connected with a brake disc of the measured brake and the hydraulic cylinder. The brake test method comprises the following steps: obtaining test parameters matched with the measured brake, the test parameters comprising at least one test period and a test torque corresponding to each test period; controlling the measured brake to be in a test state; in each test period, controlling the hydraulic cylinder to drive the push rod to apply the test torque to the brake disc, the holding time of the test torque being greater than a first time length, and the test torque being removed; completing all test periods, controlling the measured brake to be in a non-test state, and determining test parameters of the measured brake. In the technical scheme of the application, the application and removal of the test torque are realized through the extension and retraction of the hydraulic cylinder, the test period time is shortened, and the test efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of brake testing technology, and more specifically, to a brake testing method and a brake testing bench. Background Technology

[0002] Currently, brake test benches are commonly used to test the performance and durability of brakes. In some related technologies, test benches use a motor to drive the brake disc to rotate and apply test torque. When it is necessary to change the direction of the test torque or to provide test torque intermittently, the motor needs to be stopped and then restarted, which takes up a lot of test time, resulting in a long single test cycle and low test efficiency. Summary of the Invention

[0003] The present invention aims to solve the technical problems of long single test cycles and low test efficiency of brake test benches in the prior art or related technologies.

[0004] In view of this, embodiments of the present invention provide a brake testing method.

[0005] An embodiment of the present invention provides a brake test bench.

[0006] To achieve the above objectives, embodiments of the present invention provide a brake testing method for a brake test bench. The brake test bench includes a base, a hydraulic cylinder mounted on the base, and a brake under test. A push rod is provided between the hydraulic cylinder and the brake under test. One end of the push rod is connected to the brake disc of the brake under test, and the other end of the push rod is rotatably connected to one end of the hydraulic cylinder. The extension and retraction direction of the hydraulic cylinder intersects the extension direction of the push rod. The brake testing method includes: acquiring test parameters matching the brake under test, the test parameters including at least one test cycle and a test torque corresponding to each test cycle; controlling the brake under test to be in a test state; in each test cycle, controlling the hydraulic cylinder to drive the push rod to apply a test torque to the brake disc until the test torque holding time is greater than a first duration, and then releasing the test torque; after completing all test cycles, controlling the brake under test to be released from the test state, and determining the test parameters corresponding to the brake under test.

[0007] The brake testing method proposed in this invention is mainly used for brake durability performance testing. The brake test bench includes a base, a hydraulic cylinder, the brake under test, and a push rod. Based on the above structural configuration, the extension and retraction direction of the hydraulic cylinder intersects with the extension direction of the push rod, so that the hydraulic cylinder applies a test torque to the brake disc through the push rod during the extension and retraction process. By connecting one end of the push rod to the brake disc and the other end to the hydraulic cylinder in a rotatable manner, the extension and retraction motion of the hydraulic cylinder is directly converted into the test torque borne by the brake disc. Through the connection and cooperation between the push rod, the hydraulic cylinder, and the brake disc, the conversion of the extension and retraction motion of the hydraulic cylinder into the test torque of the brake disc is realized, shortening the time of a single test cycle and improving test efficiency.

[0008] By acquiring test parameters that match the brake under test, including at least one test cycle and the test torque corresponding to each test cycle, since different models of brakes under test have different structural dimensions and performance parameters, it is necessary to acquire test parameters that match the current brake under test. This is beneficial for subsequent steps to apply test loads that meet the design requirements for a specific model of brake under test, thereby improving the accuracy and effectiveness of the test results.

[0009] By controlling the brake under test to be in a test state, in each test cycle, the hydraulic cylinder drives the push rod to apply test torque to the brake disc until the test torque is held for a longer than the first duration, and then the test torque is released. This allows the hydraulic cylinder to apply rotational test torque to the brake disc of the brake under test through the push rod in a linear reciprocating motion, thereby simulating the impact load that the brake is subjected to under emergency braking conditions.

[0010] After completing all test cycles, the test state of the brake under test is released, and the test parameters corresponding to the brake under test are determined. This allows the brake under test to be removed and inspected after undergoing multiple cycles of impact, thereby obtaining data on the actual physical state changes of the brake under test after the durability test. This is beneficial for accurately assessing whether the durability performance of the brake under test meets the design requirements.

[0011] In summary, this solution converts the linear reciprocating motion of the hydraulic cylinder into a rotational test torque applied to the brake under test through the rotational connection between the hydraulic cylinder and the push rod. This simulates the impact load borne by the brake under emergency braking conditions. The test torque can be applied and eliminated by the extension and retraction of the hydraulic cylinder, thereby shortening the time of a single test cycle and improving test efficiency. At the same time, the cyclic loading method enables an accurate assessment of the brake's durability performance.

[0012] In some technical solutions, the brake test bench may optionally include a first pump station connected to the hydraulic cylinder, and the test parameters may include a target pressure associated with the test torque; controlling the hydraulic cylinder to drive the push rod to apply the test torque to the brake disc includes: obtaining the target pressure corresponding to the test torque according to the data relationship between the push rod and the hydraulic cylinder; controlling the first pump station to input the target pressure to the hydraulic cylinder, and the hydraulic cylinder applying the test torque to the brake disc through the push rod.

[0013] In this technical solution, a first pump station connected to the hydraulic cylinder is set up to provide pressure to drive the hydraulic cylinder. A target pressure associated with the test torque is set in the test parameters. The target pressure corresponding to the test torque is calculated through the data relationship between the push rod and the hydraulic cylinder, establishing a deterministic correspondence between the target pressure and the test torque. The first pump station is controlled to input the target pressure into the hydraulic cylinder. The piston inside the hydraulic cylinder generates a corresponding thrust under the action of the target pressure. The thrust is transmitted to the brake disc via the push rod, causing the brake disc to bear the test torque corresponding to the target pressure. Through the conversion relationship between pressure and torque, precise control of the test torque on the brake under test is achieved, ensuring accurate and controllable load loading within each test cycle, and achieving consistency and repeatability of the test results.

[0014] In some technical solutions, the brake test bench may optionally include a parking cylinder and a service brake cylinder located on the brake under test. The parking cylinder and the service brake cylinder are respectively connected to a second pump station to control the brake under test to be in a test state, including: obtaining the corresponding parking release pressure and service brake pressure according to the relevant parameters of the brake under test; controlling the second pump station to supply parking release pressure to the parking cylinder to release the parking brake state of the brake under test; and controlling the second pump station to supply service brake pressure to the service brake cylinder to put the brake under test into a service brake state.

[0015] In this technical solution, a second pump station is set up, connected to both the parking cylinder and the service brake cylinder of the brake under test. This second pump station provides pressure to both cylinders to control the braking state of the brake under test. The parking brake and service brake states of the brake under test are independently controlled by the parking cylinder and the service brake cylinder, respectively. Pressure is applied to the parking cylinder to release the parking brake, and pressure is applied to the service brake cylinder to apply the service brake. Based on the relevant parameters of the brake under test, the corresponding parking release pressure and service brake pressure are obtained. The second pump station is then controlled to apply the parking release pressure to the parking cylinder and the service brake pressure to the service brake cylinder, ensuring that the brake under test bears the test torque under the service brake state. By controlling the timing of releasing the parking brake before applying the service brake, a stable service brake state is ensured during the test, preventing accidental rotation of the brake under test during loading, thus improving the safety of the test process and the effectiveness of the test parameters.

[0016] In some technical solutions, optionally, controlling the brake under test to release the test state includes: controlling the second pump station to release the service brake pressure in the service brake cylinder so that the brake under test can exit the service brake state; controlling the second pump station to release the parking release pressure in the parking cylinder so that the brake under test can enter the parking brake state.

[0017] In this technical solution, after all test cycles are completed, the second pump station releases the service brake pressure in the service brake cylinder, releasing the service brake state of the brake under test, and the brake under test is no longer constrained by the service brake force. Subsequently, the second pump station releases the parking release pressure in the parking cylinder, and after the pressure in the parking cylinder decreases, the brake under test returns to the parking brake state. By controlling the sequence of releasing the service brake pressure first and then the parking release pressure, the brake under test can be safely and reliably returned to the initial parking brake state after the test, preventing accidental operation from causing injury to the operator. At the same time, the internal pressure of the brake under test is released, making it easy for the operator to remove the brake under test from the test bench for subsequent testing.

[0018] In some technical solutions, the brake test bench may optionally include a limit switch located on the movement path of the push rod. The test bench controls the brake under test to be in a test state. In each test cycle, the hydraulic cylinder drives the push rod to apply a test torque to the brake disc until the test torque is held for a duration greater than a first duration, at which point the test torque is released. Specifically, this includes: controlling the brake under test to be in a test state; in each test cycle, controlling the hydraulic cylinder to apply a test torque to the brake disc by driving the push rod; when the hydraulic cylinder pushes the push rod into contact with the limit switch, controlling the hydraulic cylinder to stop applying the test torque to the brake disc; controlling the brake under test to release from the test state; and controlling the hydraulic cylinder to retract back to its original position after the brake under test is released from the test state.

[0019] In this technical solution, a limit switch installed on the push rod's movement path detects whether the push rod has reached a preset stroke position. During the process of the hydraulic cylinder pushing the push rod to apply test torque to the brake disc, the push rod may move with the extension of the hydraulic cylinder due to pressure fluctuations within the service brake cylinder. When the piston rod of the hydraulic cylinder extends to a certain stroke, the push rod contacts the limit switch, triggering the limit switch. After the limit switch is triggered, the hydraulic cylinder is controlled to stop applying test torque to the brake disc, preventing further extension of the hydraulic cylinder that could damage the push rod or the hydraulic cylinder. Subsequently, the tested brake is controlled to release from the test state, and after the test state is released, the hydraulic cylinder is controlled to retract back to its original position, avoiding potential damage caused by forcibly retracting while the brake is still in the braking state. Through the coordinated operation of the limit switch's stroke detection and control logic, stroke protection is provided for the testing process, preventing the hydraulic cylinder from exceeding its stroke and failing to generate test torque, thus ensuring the continuity of the testing process and the safety of the equipment.

[0020] In some technical solutions, optionally, determining the test parameters corresponding to the tested brake includes: detaching the tested brake from the base and disassembling the tested brake; detecting the wear amount of the friction plate, the deformation amount of the piston and / or the wear amount of the seal of the tested brake to obtain detection data; comparing the detection data with a preset threshold; and when the detection data meets the preset threshold, determining that the tested brake is qualified.

[0021] In this technical solution, after all test cycles are completed, the tested brake is detached from the base and disassembled, so as to detect the key internal components of the tested brake. The friction plate of the tested brake is subjected to repeated friction and impact during multiple cyclic loading processes, and the wear amount of the friction plate directly reflects the wear resistance of the brake; the piston may deform during the process of repeatedly bearing hydraulic pressure and mechanical impact, and the deformation amount of the piston reflects the structural strength and deformation resistance of the piston; the seal is subjected to repeated pressure fluctuations during the test process, and the wear amount of the seal reflects the durability of the seal. The wear amount and / or deformation amount of the above components are detected to obtain detection data, the detection data is compared with a preset threshold, and when the detection data meets the preset threshold, it is determined that the tested brake is qualified. Obtaining the actual physical state change data of the key internal components of the tested brake through the disassembly detection method can accurately evaluate whether the durability performance of the tested brake after experiencing multiple cyclic impacts meets the design requirements.

[0022] In some technical solutions, optionally, each test cycle includes a loading phase and a waiting phase. In the loading phase, the hydraulic cylinder applies a test torque to the brake disc for a first duration, and in the waiting phase, the test torque is released, the hydraulic cylinder is kept in the current state and waits for a second duration to complete a single test cycle.

[0023] In this technical solution, each test cycle consists of a loading phase and a waiting phase in sequence. In the loading phase, the hydraulic cylinder applies a test torque to the brake disc for a first duration, the tested brake continuously bears the impact of the test torque within the first duration, and each component of the tested brake generates corresponding stress and strain responses under the continuous impact. In the waiting phase, the test torque is cancelled, the hydraulic cylinder is kept in a state where the target pressure is not introduced and waits for a second duration, the tested brake is in a state where no test torque is applied within the second duration, the stress of each component is released, and the residual stress gradually dissipates. The alternate setting of the loading phase and the waiting phase simulates the actual stress state of the brake that repeatedly bears impact loads under the emergency braking condition of the vehicle. The alternation of the loading phase and the waiting phase also enables the tested brake to have sufficient stress release time after each impact, so as to avoid excessive cumulative damage caused by continuous loading from affecting the objectivity of the test results.

[0024] In some technical solutions, the brake test bench may optionally include a pressure sensor connected to a hydraulic cylinder; the brake test method may also include: acquiring the input pressure of the hydraulic cylinder through the pressure sensor; and displaying the input pressure on the control interface.

[0025] In this technical solution, a pressure sensor connected to the hydraulic cylinder collects the input pressure of the hydraulic cylinder, and the pressure sensor transmits the collected pressure signal to the corresponding control system. The control interface receives the pressure signal transmitted by the pressure sensor and displays the input pressure of the hydraulic cylinder in real time as a numerical value. By observing the input pressure value displayed on the control interface, the operator can confirm in real time whether the actual input pressure of the hydraulic cylinder has reached the target pressure, thereby determining whether the test torque is applied accurately. When the input pressure deviates from the target pressure, the operator can promptly detect and adjust it, ensuring the accuracy and stability of the test torque during the testing process.

[0026] An embodiment of the present invention provides a brake test bench, comprising: a base; a hydraulic cylinder disposed on the base, one end of which is rotatably connected to the base; a brake under test disposed on the base, which is detachably connected to the base; and a push rod disposed between the hydraulic cylinder and the brake under test, one end of which is connected to the brake disc of the brake under test, and the other end of which is rotatably connected to one end of the hydraulic cylinder, wherein the extension and retraction direction of the hydraulic cylinder intersects the extension direction of the push rod; wherein the aforementioned brake testing method is realized by the brake test bench.

[0027] In this technical solution, the brake test bench includes a base and a hydraulic cylinder, the brake under test, and a push rod mounted on the base. One end of the hydraulic cylinder is rotatably connected to the base, allowing the cylinder to deflect around its connection point with the base during extension and retraction, adapting to the angle changes required by the push rod's swing. The brake under test is detachably connected to the base, facilitating its installation on the test bench before testing and its removal from the test bench for inspection after testing. The push rod is positioned between the hydraulic cylinder and the brake under test. One end of the push rod is connected to the brake disc of the brake under test, and the other end is rotatably connected to one end of the hydraulic cylinder. The extension and retraction direction of the hydraulic cylinder intersects with the extension direction of the push rod, causing the hydraulic cylinder to extend and push the push rod to swing around its connection point with the brake disc. The swinging motion of the push rod applies a test torque to the brake disc. Through this structural configuration, the extension and retraction motion of the hydraulic cylinder is directly converted into the test torque of the brake disc, eliminating the need for complex transmission components such as gears and racks, simplifying the test bench structure and reducing manufacturing costs.

[0028] In some technical solutions, the brake test bench may optionally include: an adapter, located between the push rod and the brake disc, wherein the side of the adapter facing the brake disc is detachably connected to the brake disc, and the end of the adapter facing the push rod is connected to the push rod via a drive shaft.

[0029] In this technical solution, an adapter is installed between the push rod and the brake disc. The side of the adapter facing the brake disc is detachably connected to the brake disc, allowing the adapter to be matched and replaced according to the brake disc size and interface type of different models of the brake under test, thus improving the versatility and adaptability of the test bench. The end of the adapter facing the push rod is connected to the push rod via a drive shaft. The swinging motion of the push rod is transmitted to the adapter via the drive shaft, and then to the brake disc by the adapter. The adapter enables the push rod to be compatible with different models of brake discs. At the same time, the drive shaft, as an intermediate transmission component, can compensate for installation errors and angular deviations between the push rod and the adapter, ensuring a smooth transmission path and stable transmission of test torque.

[0030] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0031] Figure 1 One of the schematic diagrams of a brake test bench according to an embodiment of the present invention is shown;

[0032] Figure 2 A second schematic diagram of the structure of a brake test bench according to an embodiment of the present invention is shown;

[0033] Figure 3 One of the structural schematic diagrams of a drive shaft according to an embodiment of the present invention is shown;

[0034] Figure 4 A second schematic diagram of the structure of a drive shaft according to an embodiment of the present invention is shown;

[0035] Figure 5 A third schematic diagram of the structure of a brake test bench according to an embodiment of the present invention is shown;

[0036] Figure 6 A schematic diagram of the structure of the first pump station in a brake test bench according to an embodiment of the present invention is shown;

[0037] Figure 7 A schematic diagram of the structure of the second pump station in a brake test bench according to an embodiment of the present invention is shown;

[0038] Figure 8 A schematic diagram of the cooling pump station in a brake test bench according to an embodiment of the present invention is shown;

[0039] Figure 9 A schematic diagram of the control interface in a brake test bench according to an embodiment of the present invention is shown;

[0040] Figure 10One of the schematic diagrams of a brake testing method according to an embodiment of the present invention is shown;

[0041] Figure 11 A second schematic diagram of a brake testing method according to an embodiment of the present invention is shown;

[0042] Figure 12 The third schematic diagram shows a brake testing method according to an embodiment of the present invention.

[0043] Among them, 1: brake test bench; 11: base; 111: push rod; 112: hydraulic cylinder; 113: adapter; 114: drive shaft; 115: pressure sensor; 116: limit switch; 12: brake under test; 121: parking cylinder; 122: service brake cylinder; 123: brake disc; 13: first pump station; 14: second pump station. Detailed Implementation

[0044] To better understand the above-described objectives, features, and advantages of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0045] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, embodiments of the invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0046] Wet brakes used in mining cars are subjected to repeated start-stop cycles and high-frequency braking impact loads, especially for mining cars weighing over 100 tons. If structural components such as the brake housing, piston, transmission flange, and drive shaft crack due to insufficient strength, it not only severely impacts the overall vehicle safety but also results in high repair costs and long improvement cycles. Because of the large braking torque of wet brakes in mining cars, manufacturers lack comprehensive durability testing equipment for wet brake structural components. Furthermore, OEMs' durability testing of brakes on the entire vehicle is hampered by long testing cycles and limited operating conditions, making it difficult to quickly assess the lifespan of brake structural components.

[0047] The following reference Figures 1 to 12 Some embodiments of the present invention are described below.

[0048] like Figure 1 and Figure 2 As shown, this embodiment provides a brake testing method for a brake test bench 1. The brake test bench 1 is used to perform durability performance testing on a brake under test 12. The brake test bench 1 includes a base 11, a hydraulic cylinder 112, the brake under test 12, and a push rod 111. Figure 10 As shown, the brake test method includes:

[0049] Step S100: Obtain test parameters that match the brake under test. The test parameters include at least one test cycle and the test torque corresponding to each test cycle.

[0050] Step S102: Control the brake under test to be in the test state. In each test cycle, control the hydraulic cylinder to drive the push rod to apply test torque to the brake disc until the holding time of the test torque is greater than the first duration, and then release the test torque.

[0051] Step S104: After completing all test cycles, control the brake under test to release the test state and determine the test parameters corresponding to the brake under test.

[0052] The base 11 is used to support and install the various components of the brake test bench 1. The base 11 can be made of cast iron or welded steel plate. Anchor bolt mounting holes can be provided on the lower end face of the base 11, and the base 11 can be fixed to the test chamber floor by anchor bolts.

[0053] Hydraulic cylinder 112 is mounted on base 11, with one end rotatably connected to base 11. A corresponding connecting seat can be provided on base 11, and the connecting seat can be connected to one end of the hydraulic rod via a pin. During operation, hydraulic cylinder 112 pushes push rod 111 to swing, and the extension / retraction direction of hydraulic cylinder 112 will deflect with the swing of push rod 111. The extension / retraction direction is... Figure 1 In the X direction, one end of the hydraulic cylinder 112 is rotatably connected to the base 11, which can adapt to the angle change requirements of the hydraulic cylinder 112 during operation. This prevents additional bending stress between the piston rod and cylinder body of the hydraulic cylinder 112 due to the rigid fixed connection between the hydraulic cylinder 112 and the base 11, thereby helping to extend the service life of the hydraulic cylinder 112 and achieve smooth thrust transmission.

[0054] A push rod 111 is positioned between the hydraulic cylinder 112 and the brake 12 under test. One end of the push rod 111 is connected to the brake disc 123 of the brake 12 under test, and the other end of the push rod 111 is rotatably connected to one end of the hydraulic cylinder 112. The extension direction of the push rod 111 intersects the extension and retraction direction of the hydraulic cylinder 112. Figure 2The Y-direction, i.e., the extension and retraction direction of the hydraulic cylinder 112, forms a certain angle with the extension direction of the push rod 111, for example, 90° or close to 90°. Since one end of the push rod 111 is connected to the brake disc 123 of the brake under test 12, and the other end of the push rod 111 is rotatably connected to the end of the piston rod of the hydraulic cylinder 112, when the piston rod of the hydraulic cylinder 112 extends, the thrust of the hydraulic cylinder 112 is transmitted to the brake disc 123 through the push rod 111. The push rod 111 swings around the connection between the push rod 111 and the brake disc 123, thereby applying a test torque to the brake disc 123.

[0055] The brake under test 12 is mounted on the base 11 and is detachably connected to the base 11. The brake under test 12 can be connected to a corresponding mounting bracket on the base 11 via bolts. Multiple bolt holes are provided on the housing of the brake under test 12, and corresponding threaded holes are provided on the base 11. Bolts pass through the bolt holes on the housing of the brake under test 12 and are threadedly connected to the threaded holes on the base 11. Because the brake under test 12 and the base 11 are detachably connected, it is convenient to install the brake under test 12 on the test bench before testing and to remove the brake under test 12 from the test bench for subsequent testing after testing.

[0056] The brake under test 12 can be a disc brake, including a brake disc 123, friction pads, a piston, seals, a parking cylinder 121, and a service brake cylinder 122. The brake disc 123 is the rotary input end of the brake under test 12. During the test, the hydraulic cylinder 112 applies a test torque to the brake disc 123 via the push rod 111, causing the brake disc 123 to bear a loading torque. The friction pads are disposed on both sides of the brake disc 123. In the service braking state, the friction pads clamp the brake disc 123, keeping the brake disc 123 stationary. The piston, disposed in the service brake cylinder 122, pushes the friction pads towards the brake disc 123 under the action of the service braking pressure. Seals can be disposed between the piston and the cylinder wall of the service brake cylinder 122 to prevent pressurized oil leakage. The parking cylinder 121 is used to control the release and restoration of the parking brake state of the brake under test 12.

[0057] By acquiring test parameters that match the brake under test 12, including at least one test cycle and the test torque corresponding to each test cycle, since different models of the brake under test 12 have different structural dimensions and performance parameters, it is necessary to acquire test parameters that match the current brake under test 12. This is beneficial for subsequent steps to apply test loads that meet the design requirements for the model of the brake under test 12, thereby improving the accuracy and effectiveness of the test results.

[0058] By controlling the brake under test 12 to be in a test state, in each test cycle, the hydraulic cylinder 112 drives the push rod 111 to apply a test torque to the brake disc 123 until the holding time of the test torque is greater than a first duration, and then the test torque is released. One end of the push rod 111 is connected to the brake disc 123 of the brake under test 12, and the other end of the push rod 111 is rotatably connected to one end of the hydraulic cylinder 112. The extension and retraction direction of the hydraulic cylinder 112 intersects the extension direction of the push rod 111. Based on this configuration, when the hydraulic cylinder 112 extends and retracts, the extension end deflects relative to the base 11, pushing the push rod 111 to swing around the connection point between the push rod 111 and the brake disc 123. The push rod 111 applies a test torque to the brake disc 123 through the swinging action, which helps to reduce transmission backlash and energy loss, and improve the application accuracy and response speed of the test torque. When the holding time of the test torque is greater than the first duration, the test torque is released. Within a single test cycle, the test torque is applied to subject each component of the brake under test 12 to impact force. After holding for the first duration, the test torque is released, so that the brake under test 12 can release residual stress after each impact, avoiding the cumulative damage caused by continuous loading from affecting the objectivity of the test results.

[0059] By repeatedly executing multiple test cycles, after all test cycles are completed, the test state of the brake under test 12 is released, and the test parameters corresponding to the brake under test 12 are determined. Through cyclic loading of multiple test cycles, the working condition of the brake under test 12 repeatedly subjected to emergency braking impact during actual vehicle use is simulated. The determined test parameters can reflect the performance state of the brake under test 12 after experiencing multiple impacts, thereby realizing a quantitative evaluation of the durability performance of the brake under test 12.

[0060] In summary, by connecting one end of the push rod 111 to the brake disc 123 and the other end of the push rod 111 to the hydraulic cylinder 112, the extension and retraction motion of the hydraulic cylinder 112 is directly converted into the test torque borne by the brake disc 123, without the need for an additional motion conversion mechanism. This shortens the time of a single test cycle and improves test efficiency. By setting at least one test cycle and a test torque corresponding to each test cycle, the hydraulic cylinder 112 applies a test torque to the brake disc 123 in each test cycle until the test torque is held for a first duration, after which the test torque is released, completing a single test cycle. This simulates the condition of the brake under test 12 repeatedly bearing braking loads during actual use. After all test cycles are completed, the brake under test 12 is controlled to exit the test state and the corresponding test parameters are determined. The test parameters are used to determine whether the brake under test 12 meets the durability performance requirements. In this embodiment, the test torque input to the brake under test 12 is achieved through the transmission cooperation of the hydraulic cylinder 112 and the push rod 111, shortening the time of a single test cycle and improving test efficiency. At the same time, the cyclic loading method enables accurate evaluation of the brake's durability performance.

[0061] In some embodiments, optionally, such as Figure 5 and Figure 6 As shown, the brake test bench 1 also includes a first pump station 13 connected to the hydraulic cylinder 112, and the test parameters also include a target pressure associated with the test torque. The steps of controlling the hydraulic cylinder 112 to drive the push rod 111 to apply the test torque to the brake disc 123 specifically include: obtaining the target pressure corresponding to the test torque according to the data relationship between the push rod 111 and the hydraulic cylinder 112; controlling the first pump station 13 to input the target pressure to the hydraulic cylinder 112, and the hydraulic cylinder 112 applying the test torque to the brake disc 123 through the push rod 111.

[0062] By setting up a first pump station 13 connected to the hydraulic cylinder 112, the first pump station 13 provides pressurized oil to the hydraulic cylinder 112 to drive its movement. The first pump station 13 can use a gear pump as the pressurized oil source. The gear pump is driven by a motor, drawing in low-pressure oil from the hydraulic oil tank and converting it into high-pressure oil, which is then output to the hydraulic cylinder 112. The first pump station 13 may also include a relief valve, which controls the output pressure of the first pump station 13 by adjusting its opening pressure, thereby achieving precise adjustment of the input pressure of the hydraulic cylinder 112. The first pump station 13 may also include a solenoid directional valve, which controls the flow direction of the pressurized oil by switching the solenoid directional valve, thereby controlling the extension and retraction state of the hydraulic cylinder 112.

[0063] The test parameters include a target pressure associated with the test torque. The target pressure corresponding to the test torque is calculated using the data relationship between push rod 111 and hydraulic cylinder 112, establishing a deterministic correspondence between the target pressure and the test torque. Specifically, the piston of hydraulic cylinder 112 generates thrust under the action of pressurized oil. The magnitude of the thrust is equal to the piston area of ​​hydraulic cylinder 112 multiplied by the input pressure. One end of push rod 111 is rotatably connected to the piston rod of hydraulic cylinder 112, and the other end is connected to brake disc 123. Push rod 111 forms a lever system, with a lever arm length equal to the distance between the connection point of the piston rod of hydraulic cylinder 112 and push rod 111 and the connection point of push rod 111 and brake disc 123. Therefore, the test torque is equal to the thrust of hydraulic cylinder 112 multiplied by the lever arm length of push rod 111. Based on this data relationship, the required target pressure can be derived from the required test torque.

[0064] After the first pump station 13 inputs the target pressure to the hydraulic cylinder 112, the piston inside the hydraulic cylinder 112 generates a corresponding thrust under the action of the target pressure. The thrust is transmitted to the brake disc 123 via the push rod 111, causing the brake disc 123 to bear the test torque corresponding to the target pressure. Through the above-mentioned conversion relationship between pressure and torque, precise control of the test torque on the brake under test 12 is achieved, thereby making the load in each test cycle accurate and controllable, and thus achieving the consistency and repeatability of the test results.

[0065] In some embodiments, optionally, such as Figure 5 and Figure 7 As shown, the brake test bench 1 also includes a parking cylinder 121 and a service brake cylinder 122 disposed on the brake under test 12. The parking cylinder 121 and the service brake cylinder 122 are respectively connected to the second pump station 14. The steps for controlling the brake under test 12 to be in the test state specifically include: obtaining the corresponding parking release pressure and service brake pressure according to the relevant parameters of the brake under test 12; controlling the second pump station 14 to supply parking release pressure to the parking cylinder 121 to release the parking brake state of the brake under test 12; and controlling the second pump station 14 to supply service brake pressure to the service brake cylinder 122 to put the brake under test 12 into the service brake state.

[0066] A second pump station 14, connected to the parking cylinder 121 and the service brake cylinder 122 of the brake under test 12, is provided to supply pressurized oil to the parking cylinder 121 and the service brake cylinder 122 to control the braking state of the brake under test 12. The second pump station 14 may include a hydraulic pump, a relief valve, and a pressure reducing valve, wherein the relief valve is used to regulate the system pressure, and the pressure reducing valve is used to reduce the system pressure to the working pressure required by the parking cylinder 121 or the service brake cylinder 122. The second pump station 14 may also include a solenoid directional valve, which controls the on / off of the oil circuit for pressurized oil to the parking cylinder 121 or the service brake cylinder 122 by reversing the solenoid directional valve.

[0067] The parking brake and service brake states of the brake under test 12 are independently controlled by the parking cylinder 121 and the service brake cylinder 122, respectively. Pressure is applied to the parking cylinder 121 to release the parking brake, and pressure is applied to the service brake cylinder 122 to apply the service brake. Based on relevant parameters of the brake under test 12, such as its model, specifications, and design working pressure, the corresponding parking release pressure and service brake pressure are obtained. The second pump station 14 is then controlled to apply the parking release pressure to the parking cylinder 121 and the service brake pressure to the service brake cylinder 122, ensuring that the brake under test 12 bears the test torque under the service brake state. By controlling the timing of releasing the parking brake before applying the service brake, a stable service brake state is ensured for the brake under test 12 during the test, preventing accidental rotation during loading and thus guaranteeing the safety of the test process and the validity of the test data.

[0068] In some embodiments, optionally, such as Figure 7 As shown, the steps for controlling the brake under test 12 to release the test state specifically include: controlling the second pump station 14 to release the service brake pressure in the service brake cylinder 122 so that the brake under test 12 exits the service brake state; controlling the second pump station 14 to release the parking release pressure in the parking cylinder 121 so that the brake under test 12 is in the parking brake state.

[0069] After all test cycles are completed, the second pump station 14 releases the service brake pressure in the service brake cylinder 122, releasing the service brake state of the brake under test 12, and the brake under test 12 is no longer constrained by the service brake force. Subsequently, the second pump station 14 releases the parking release pressure in the parking cylinder 121, and the brake under test 12 returns to the parking brake state after the pressure in the parking cylinder 121 decreases. By controlling the sequence of releasing the service brake pressure first and then the parking release pressure, the brake under test 12 can be safely and reliably in the parking brake state after the test, thereby preventing possible injury to the operator due to accidental operation. At the same time, the pressure in the parking cylinder 121 and the service brake cylinder 122 is discharged through the second pump station 14, making it convenient for the operator to remove the brake under test 12 from the test bench for subsequent testing.

[0070] In some embodiments, optionally, such as Figure 2 As shown, the brake test bench 1 also includes a limit switch 116, which is positioned on the movement path of the push rod 111. Figure 11 As shown, step 102: Control the brake under test to be in the test state. In each test cycle, control the hydraulic cylinder to drive the push rod to apply test torque to the brake disc until the holding time of the test torque is greater than the first duration, then release the test torque. Specifically, this includes:

[0071] Step 1020: Control the brake under test to be in the test state. In each test cycle, control the hydraulic cylinder to drive the push rod to apply the test torque to the brake disc.

[0072] Step 1022: With the hydraulic cylinder pushing the push rod into contact with the limit switch, control the hydraulic cylinder to stop applying the test torque to the brake disc;

[0073] Step 1024: Control the brake under test to release the test state;

[0074] Step 1026: After the brake under test is released from the test state, control the hydraulic cylinder to retract to its original position.

[0075] A limit switch 116, positioned along the movement path of the push rod 111, detects whether the push rod 111 has reached a preset travel position. The limit switch 116 can be a mechanical contact limit switch or a non-contact proximity switch. When a mechanical contact limit switch is used, a contact rod or stop block can be fixedly mounted on the push rod 111. During the movement of the push rod 111, the contact rod or stop block moves with the push rod 111. When the push rod 111 reaches the preset travel position, the contact rod or stop block contacts the contact of the limit switch, triggering the limit switch operation. When a non-contact proximity switch is used, the proximity switch determines whether the push rod 111 has reached the preset travel position by detecting whether the push rod 111 or a detection piece mounted on the push rod 111 enters the detection area.

[0076] During the process of hydraulic cylinder 112 pushing push rod 111 to apply test torque to brake disc 123, if the pressure inside the service brake cylinder 122 of the brake under test 12 becomes abnormal, push rod 111 moves with the extension of hydraulic cylinder 112. When the piston rod of hydraulic cylinder 112 extends to the rated stroke, for example, the rated stroke is 100mm, push rod 111 contacts limit switch 116, and limit switch 116 is triggered. After limit switch 116 is triggered, the corresponding control system receives the electrical signal sent by limit switch 116 and controls hydraulic cylinder 112 to stop applying test torque to brake disc 123, for example, by controlling the first pump station 13 to stop oil supply or controlling the solenoid directional valve to switch to the neutral cut-off state, thereby preventing hydraulic cylinder 112 from continuing to extend and causing damage to push rod 111 or hydraulic cylinder 112. Then, control the brake under test 12 to release the test state, for example, release the service brake pressure. After releasing the test state, control the hydraulic cylinder 112 to retract back to its original position, for example, control the solenoid directional valve to switch so that the pressure oil can flow to the rodless chamber or rod chamber of the hydraulic cylinder 112, pushing the piston rod to retract.

[0077] Through the aforementioned sequential control, potential equipment damage caused by forcibly retracting the brake while it is still in the braking state is avoided, while ensuring the continuity of the test, allowing the system to proceed to the next cycle without manual intervention. Therefore, the coordinated operation of the limit switch 116's stroke detection and control logic provides stroke protection for the testing process, preventing the hydraulic cylinder 112 from exceeding its stroke and thus ensuring the continuity of the testing process and the safety of the equipment.

[0078] In some embodiments, optionally, the step of determining the test parameters corresponding to the brake under test 12 specifically includes: removing the brake under test 12 from the base 11 and disassembling the brake under test 12; detecting the wear amount of the friction pads, the deformation of the piston and / or the wear amount of the seals of the brake under test 12, and obtaining test data; comparing the test data with a preset threshold; and determining that the brake under test 12 is qualified when the test data meets the preset threshold.

[0079] After all test cycles are completed, the brake under test 12 is detached from the base 11 and disassembled to allow for the inspection of its internal critical components. The friction pads of the brake under test 12 endure repeated friction and impact during multiple cyclic impacts; the wear of the friction pads directly reflects the brake's wear resistance. The piston may deform during repeated hydraulic pressure and mechanical impacts; the piston's deformation reflects its structural strength and resistance to deformation. The seals endure repeated pressure fluctuations during the test; the wear of the seals reflects their durability.

[0080] When inspecting the wear and / or deformation of the aforementioned components, direct measurement can be performed using measuring tools such as vernier calipers and micrometers, or precise measurement can be performed using equipment such as optical microscopes and profilometers. After obtaining the inspection data, the data is compared with preset thresholds, which can be pre-set according to the design requirements and relevant technical standards of the brake 12 under test. When the inspection data meets the preset thresholds, for example, when the wear of the friction pads is less than or equal to the maximum allowable wear, the piston deformation is less than or equal to the maximum allowable deformation, or the wear of the seals is less than or equal to the maximum allowable wear, the brake 12 under test is determined to be qualified; when the inspection data does not meet the preset thresholds, the brake 12 under test is determined to be unqualified. By obtaining the actual physical state change data of the key internal components of the brake 12 under test through the above disassembly and inspection method, it is possible to accurately assess whether the durability performance of the brake 12 under test meets the design requirements after undergoing multiple cyclic impacts.

[0081] In some embodiments, each test cycle may optionally include a loading phase and a waiting phase. During the loading phase, the hydraulic cylinder 112 applies a test torque to the brake disc 123 for a first duration; during the waiting phase, the test torque is released, allowing the hydraulic cylinder 112 to remain in its current state and wait for a second duration, thus completing a single test cycle.

[0082] Each test cycle consists of a loading phase and a waiting phase. During the loading phase, the hydraulic cylinder 112 applies a test torque to the brake disc 123 for a first duration. The brake under test 12 continuously withstands the impact of the test torque during this first duration, and the various components of the brake under test 12 generate corresponding stress and strain responses under the continuous impact. The first duration can be set according to the type of brake under test 12 and the test requirements; for example, it can be set to 3 seconds.

[0083] During the waiting phase, the test torque is released, for example by controlling the first pump station 13 to stop supplying oil to the hydraulic cylinder 112 or controlling the solenoid directional valve to switch to the neutral cut-off state, so that the hydraulic cylinder 112 remains in its current state and waits for a second duration. During the second duration, the brake under test 12 is in an unloaded state, the stress of each component is released, and the residual stress gradually dissipates. The second duration can be set according to the type of brake under test 12 and the test requirements, for example, it can be set to 3 seconds.

[0084] By alternating between loading and waiting phases, the actual stress state of the brake under repeated impact loads during emergency braking is simulated. Simultaneously, the alternation of loading and waiting phases allows sufficient stress release time for the tested brake 12 after each impact, thus preventing the cumulative damage caused by continuous loading from excessively affecting the objectivity of the test results. Therefore, this test cycle configuration scheme can more realistically simulate actual working conditions, thereby improving the accuracy and reliability of the test results.

[0085] In some embodiments, optionally, such as Figure 6 As shown, the brake test bench 1 also includes a pressure sensor 115, which is connected to the hydraulic cylinder 112. Figure 12 As shown, the brake test method also includes:

[0086] Step 106: Collect the input pressure of the hydraulic cylinder using a pressure sensor;

[0087] Step 108: Display the input pressure on the control interface.

[0088] In this embodiment, the input pressure of the hydraulic cylinder 112 is acquired by a pressure sensor 115 connected to the hydraulic cylinder 112. The pressure sensor 115 can be installed at the oil inlet of the hydraulic cylinder 112 or on the oil pipe connecting the hydraulic cylinder 112 and the first pump station 13. The sensitive element of the pressure sensor 115 converts the input pressure of the hydraulic cylinder 112 into an electrical signal. The control system receives the electrical signal transmitted by the pressure sensor 115, performs analog-to-digital conversion and data processing, and displays the input pressure of the hydraulic cylinder 112 in numerical form in real time on the control interface, such as a touch screen or a host computer monitoring interface.

[0089] like Figure 9 As shown, by observing the input pressure value displayed on the control interface, the operator can confirm in real time whether the actual input pressure of the hydraulic cylinder 112 has reached the target pressure, thereby determining whether the test torque is applied accurately. When the input pressure deviates from the target pressure, for example due to changes in hydraulic oil viscosity caused by oil temperature variations or drift in the relief valve setting, the operator can promptly detect and adjust the situation, such as adjusting the opening pressure of the relief valve or adjusting the output pressure of the first pump station 13, thus ensuring the accuracy and stability of the load applied during the test.

[0090] like Figure 1 and Figure 2 As shown, another embodiment of this application provides a brake test bench 1, including a base 11 and a hydraulic cylinder 112 disposed on the base 11, one end of the hydraulic cylinder 112 being rotatably connected to the base 11; a brake under test 12, disposed on the base 11, and detachably connected to the base 11; a push rod 111, disposed between the hydraulic cylinder 112 and the brake under test 12, one end of the push rod 111 being connected to the brake disc 123 of the brake under test 12, and the other end of the push rod 111 being rotatably connected to one end of the hydraulic cylinder 112, the extension and retraction direction of the hydraulic cylinder 112 intersecting the extension direction of the push rod 111; wherein, the aforementioned brake test method is realized by the brake test bench 1.

[0091] The brake test bench 1 includes a base 11 and a hydraulic cylinder 112, a brake under test 12, and a push rod 111 mounted on the base 11. The base 11 can be welded from H-beams or a box-shaped structure. The bottom of the base 11 can be fixed to the ground with anchor bolts to achieve the stability and rigidity of the test bench during the testing process.

[0092] One end of the hydraulic cylinder 112 is rotatably connected to the base 11, for example, by hinged connection to a lug fixed on the base 11 via a pin. This allows the hydraulic cylinder 112 to deflect around its connection point with the base 11 during extension and retraction, thus adapting to the angular changes required during the swing of the push rod 111. The cylinder barrel of the hydraulic cylinder 112 can be made of high-strength seamless steel tubing to provide sufficient working strength. The extended end of the piston rod of the hydraulic cylinder 112 is equipped with a connecting fork or lug for rotatably connecting to one end of the push rod 111.

[0093] The brake under test 12 is detachably connected to the base 11, for example, by bolts, which facilitates the mounting of the brake under test 12 onto the test bench before testing and the removal of the brake under test 12 from the test bench after testing. The brake under test 12 can be mounted on the base 11 via a brake mounting bracket. The bottom of the brake mounting bracket can be bolted to the base 11 through a slotted hole, allowing the brake mounting bracket to be adjusted in position to accommodate brakes 12 of different sizes.

[0094] A push rod 111 is positioned between the hydraulic cylinder 112 and the brake under test 12. One end of the push rod 111 is connected to the brake disc 123 of the brake under test 12, for example, via a key or bolt. The other end of the push rod 111 is rotatably connected to one end of the hydraulic cylinder 112, for example, via a pin. The extension and retraction direction of the hydraulic cylinder 112 intersects the extension direction of the push rod 111. For example, the angle between the extension and retraction direction of the hydraulic cylinder 112 and the extension direction of the push rod 111 is an acute angle, a right angle, or an obtuse angle, so that when the hydraulic cylinder 112 extends, it pushes the push rod 111 to swing around the connection point between the push rod 111 and the brake disc 123. The swinging motion of the push rod 111 applies a test torque to the brake disc 123.

[0095] Through the above structural configuration, the extension and retraction motion of the hydraulic cylinder 112 is directly converted into the test torque of the brake disc 123. Since there is no need to add complex transmission components such as gears and racks, the structure of the test bench is simplified, thereby reducing the manufacturing cost.

[0096] In some embodiments, optionally, such as Figure 1 and Figure 2 As shown, the brake test bench 1 is also provided with an adapter 113. The adapter 113 is located between the push rod 111 and the brake disc 123. The side of the adapter 113 facing the brake disc 123 is detachably connected to the brake disc 123. The end of the adapter 113 facing the push rod 111 is connected to the push rod 111 via a drive shaft 114.

[0097] By providing an adapter 113 between the push rod 111 and the brake disc 123, the adapter 113 is detachably connected to the brake disc 123 on the side facing the brake disc 123, for example, by bolt connection. This allows the adapter 113 to be matched and replaced according to the size and interface form of the brake disc 123 of different models of the brake under test, thereby improving the versatility and adaptability of the test bench. The adapter 113 can adopt a flange structure, with bolt holes on the flange corresponding to the mounting holes on the brake disc 123, and the adapter 113 is fixedly connected to the brake disc 123 by bolts.

[0098] The end of the adapter 113 facing the push rod 111 is connected to the push rod 111 via a drive shaft 114. One end of the drive shaft 114 is connected to the push rod 111, as shown below. Figure 3 and Figure 4 As shown, the other end of the drive shaft 114 is connected to the adapter 113, for example, via a square key or welding. The oscillating motion of the push rod 111 is transmitted to the adapter 113 via the drive shaft 114, and then from the adapter 113 to the brake disc 123. A bearing may also be provided between the drive shaft 114 and the adapter 113 to reduce frictional resistance during transmission.

[0099] The adapter 113 enables the push rod 111 to be compatible with different models of brake discs 123. Simultaneously, the drive shaft 114, as an intermediate transmission component, compensates for installation errors and angular deviations between the push rod 111 and the adapter 113, thus ensuring a smooth transmission path and stable transmission of test torque. Therefore, the adapter 113 improves the versatility of the brake test bench 1, allowing it to be used for testing various brake models, thereby reducing the procurement and maintenance costs of the testing equipment.

[0100] In one specific embodiment, a durability test bench and test method for wet brake structural components are provided, including a brake test bench 1 and a brake test method. In addition, it may also include a control pump station, a cooling pump station and a control system.

[0101] The brake test bench 1 uses a hydraulic cylinder 112 as the impact power source. Through a lever mechanism, it generates impact torque to apply impact load to the brake under test 12, simulating the impact of the vehicle's braking conditions on the brake's structural components, thereby effectively evaluating the brake's service life. A single impact test can be completed in just 3 seconds, improving testing efficiency and enabling 100,000 life tests to be completed within a month. By setting a limit switch 116 on the push rod 111, the hydraulic cylinder 112 is prevented from reaching its stroke and failing to accurately apply output force to the brake under test 12. The hydraulic cylinder 112 can also automatically retract to continue the test, achieving unattended automatic testing. The hydraulic cylinder 112 applies driving force, and the push rod 111 is replaced with the driving torque of the brake under test 12 to simulate external impacts on the brake under test 12. Different loads can be applied by adjusting the pressure value entering the hydraulic cylinder 112.

[0102] like Figure 8 As shown, the cooling pump station is used to circulate and cool the brake friction pads to prevent the heat generated by the brake friction pads due to fretting from damaging the paper-based friction pads and affecting the test results.

[0103] The control pump station can control the extension and retraction of the hydraulic cylinder 112, release the parking brake and release the service brake, so that the brake under test 12 is always in a locked state. Then, an impact is applied to the brake under test 12 to effectively test the strength and life of parts such as the brake friction pad spline, drive shaft 114, and brake housing.

[0104] The control system uses a PLC to control the brake durability test bench and record data, realize the automatic loading and unloading of hydraulic cylinder 112, detect and record the number of braking impacts, and monitor the cooling oil temperature of the brake 12 under test to prevent the oil temperature from becoming too high due to prolonged operation of related pump stations.

[0105] like Figure 1As shown, the brake test bench 1 includes: a limit switch 116, an adapter 113, a brake under test 12, a hydraulic cylinder 112, a base 11, and a push rod 111. It may also include: a support frame, a brake fixing bracket, a cylinder pin, and a cylinder fixing seat.

[0106] The support frame can be fixed to the base 11 with bolts. A bearing can be installed between the drive shaft 114 and the support frame. The push rod 111 and the adapter 113 are both connected to the drive shaft 114 via square keys. The brake test bench 1 can replace different adapters 113 to meet the testing needs of more different models of brakes. At the same time, the adapter 113 can also be integrated with the drive shaft 114 to improve overall integrity. The adapter 113 can be matched and applied according to different brakes 12 under test. The left side of the brake 12 under test is fixed to the adapter 113, and the right end is fixed to the brake mounting bracket. The bottom of the brake mounting bracket is connected to the base 11 by a bolt with a slotted hole, or by a screw adjustment method. The fixing gap can be adjusted according to the actual needs of the brake 12 under test to prevent oil leakage from the floating seal on the brake 12 under test.

[0107] This embodiment is not limited to making the adapter 113 and the drive shaft separate parts; they can also be made into a single unit. It is not limited to replacing the waist hole structure with other structures that allow for horizontal adjustment, such as a screw.

[0108] The testing process includes: Figure 7 As shown, the second pump station 14 supplies 10MPa pressure to the parking cylinder 121 to release and maintain the parking brake. The second pump station 14 maintains pressure supply even when the machine is stopped, which reduces energy consumption during the test. The second pump station 14 supplies 13MPa working pressure to the service brake cylinder 122 of the brake under test 12 to maintain the service brake in a braking state, thereby generating a braking torque of 150kN·m in the brake under test 12 to prevent the brake under test 12 from rotating.

[0109] like Figure 6 As shown, when a working pressure of 10 MPa is supplied to the hydraulic cylinder 112, a thrust of approximately 130 kN can be generated based on the piston area of ​​the hydraulic cylinder 112. With a lever length of 1 meter, a torque of 130 kN·m can be generated. Figure 1As shown, the hydraulic cylinder 112 pushes the push rod 111, which drives the transmission shaft 114 and the adapter 113 to rotate, generating a test torque, which is then transmitted to the brake under test 12, causing each component of the brake under test 12 to be subjected to impact force. By adjusting the pressure of the overflow valve of the first pump station 13, different thrusts of the hydraulic cylinder 112 can be achieved, thereby generating different rotational torques. The pressure sensor 115 transmits the injection pressure of the hydraulic cylinder 112 to the interface of the programmable logic controller (PLC) for display.

[0110] The hydraulic cylinder 112 is pressurized for 3 seconds and then stopped. After waiting for 3 seconds, it is restarted to cyclically impact the brake 12 under test, simulating the force on the brake 12 under the condition of emergency braking of the vehicle.

[0111] Considering that during the test, the hydraulic cylinder 112 may push the brake 12 under test to rotate and extend the piston rod, when the piston rod of the hydraulic cylinder 112 exceeds its stroke, for example, when the piston of the hydraulic cylinder 112 extends 100mm, the hydraulic cylinder 112 will be unable to push the drive shaft 114 to generate torque. Therefore, a limit switch 116 is installed on the test bench. When the hydraulic cylinder 112 reaches its rated stroke, it will stop extending. At this time, the control system releases the driving pressure of the brake 12 under test, and then the first pump station 13 controls the corresponding hydraulic valve to switch direction, causing the piston rod of the hydraulic cylinder 112 to retract, and the test is repeated.

[0112] The start-up and shutdown of the first pump station 13 and the second pump station 14, the switching of the electromagnetic reversing valve, and the adjustment of the overflow valve are controlled by PLC. The test bench can be automatically run and the number of tests can be detected by controlling the PLC. Manual intervention can be achieved to stop the test, thus realizing unattended automatic testing.

[0113] Repeat the above steps until the experiment is completed.

[0114] The testing methods for the test bench include:

[0115] Start the second pump station 14, and adjust the corresponding overflow valve and pressure reducing valve according to the specific model of the brake 12 under test to achieve the required parking release pressure and ensure that the parking brake is released.

[0116] Adjust the overflow valve according to the specific model of the brake 12 under test to achieve the required service braking pressure of the brake 12 under test, and ensure the implementation of service braking.

[0117] Press the start button on the PLC control interface. At this time, the gear pump of the first pump station 13 starts, the solenoid directional valve actuates, and then the hydraulic cylinder 112 begins to move. The number of movements will be displayed on the control interface. Observe whether there are any abnormalities in the movement. If the test is abnormal, press the stop button to stop the test bench.

[0118] After observing 5 to 10 actions without any abnormalities, press the automatic button. At this time, the test bench will run automatically according to the test cycle and record the number of actions.

[0119] In this invention, the terms "sealed," "fixed," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installed," "connected," "linked," and "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "linked" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0120] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0121] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0122] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A brake testing method, characterized in that, A brake test bench is used, comprising a base, a hydraulic cylinder mounted on the base, and a brake under test. A push rod is provided between the hydraulic cylinder and the brake under test. One end of the push rod is connected to the brake disc of the brake under test, and the other end of the push rod is rotatably connected to one end of the hydraulic cylinder. The extension and retraction direction of the hydraulic cylinder intersects the extension direction of the push rod. The brake test method includes: Obtain test parameters that match the brake under test, the test parameters including at least one test cycle and a test torque corresponding to each test cycle; The test brake is controlled to be in a test state. In each test cycle, the hydraulic cylinder is controlled to drive the push rod to apply the test torque to the brake disc until the holding time of the test torque is greater than the first duration, and then the test torque is released. After all the test cycles are completed, the test state of the brake under test is released, and the test parameters corresponding to the brake under test are determined.

2. The brake test method according to claim 1, characterized in that, The brake test bench also includes a first pump station connected to the hydraulic cylinder, and the test parameters also include a target pressure associated with the test torque; The control of the hydraulic cylinder to drive the push rod to apply the test torque to the brake disc includes: Based on the data relationship between the push rod and the hydraulic cylinder, the target pressure corresponding to the test torque is obtained; The first pump station is controlled to input the target pressure into the hydraulic cylinder, and the hydraulic cylinder applies the test torque to the brake disc through the push rod.

3. The brake test method according to claim 2, characterized in that, The brake test bench also includes a parking cylinder and a service brake cylinder disposed on the brake under test. The parking cylinder and the service brake cylinder are respectively connected to a second pump station. Controlling the brake under test to be in the test state includes: Based on the relevant parameters of the brake under test, obtain the corresponding parking release pressure and service brake pressure; The second pump station is controlled to supply parking release pressure to the parking cylinder to release the parking brake state of the tested brake. The second pump station is controlled to supply the service brake pressure to the service brake cylinder so that the brake under test is in the service brake state.

4. The brake test method according to claim 3, characterized in that, The step of controlling the brake under test to release the test state includes: Control the second pump station to release the service brake pressure in the service brake cylinder so that the tested brake can exit the service brake state; Control the second pump station to release the parking release pressure in the parking cylinder so that the tested brake is in the parking brake state.

5. The brake test method according to claim 1, characterized in that, The brake test bench also includes a limit switch, which is located on the moving path of the push rod; The test brake is controlled to be in a test state. During each test cycle, the hydraulic cylinder is controlled to drive the push rod to apply the test torque to the brake disc until the test torque is held for a duration greater than a first duration, at which point the test torque is released. Specifically, this includes: The test brake is controlled to be in the test state, and in each test cycle, the hydraulic cylinder is controlled to drive the push rod to apply test torque to the brake disc; While the hydraulic cylinder pushes the push rod to contact the limit switch, the hydraulic cylinder is controlled to stop applying the test torque to the brake disc. Control the brake under test to release the test state; After the tested brake is released from the test state, the hydraulic cylinder is controlled to retract and return to its original position.

6. The brake test method according to claim 1, characterized in that, The determination of the test parameters corresponding to the brake under test includes: Remove the brake under test from the base and disassemble the brake under test; The wear of the friction pads, the deformation of the piston, and / or the wear of the seals of the brake under test are detected to obtain test data; The detection data is compared with a preset threshold. When the test data meets the preset threshold, the tested brake is determined to be qualified.

7. The brake test method according to claim 1, characterized in that, Each test cycle includes a loading phase and a waiting phase. In the loading phase, the hydraulic cylinder applies the test torque to the brake disc for a first duration. In the waiting phase, the test torque is released, the hydraulic cylinder remains in its current state, and waits for a second duration to complete a single test cycle.

8. The brake test method according to claim 1, characterized in that, The brake test bench also includes a pressure sensor, which is connected to the hydraulic cylinder. The brake test method also includes: The input pressure of the hydraulic cylinder is acquired by the pressure sensor; The input pressure is displayed on the control interface.

9. A brake test bench, characterized in that, include: Base; A hydraulic cylinder is mounted on the base, with one end of the hydraulic cylinder rotatably connected to the base. The brake under test is mounted on the base and is detachably connected to the base. A push rod is disposed between the hydraulic cylinder and the brake under test. One end of the push rod is connected to the brake disc of the brake under test, and the other end of the push rod is rotatably connected to one end of the hydraulic cylinder. The extension and retraction direction of the hydraulic cylinder intersects with the extension direction of the push rod. The brake test method as described in any one of claims 1 to 8 is implemented through the brake test bench.

10. The brake test bench according to claim 9, characterized in that, Also includes: An adapter is provided between the push rod and the brake disc. The side of the adapter facing the brake disc is detachably connected to the brake disc, and the end of the adapter facing the push rod is connected to the push rod via a drive shaft.

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