Caliper durability test fixture

Abstract

The present application relates to the technical field of brake detection, and particularly relates to a caliper endurance test fixture. The present application discloses a caliper endurance test fixture, which comprises a first power transmission assembly, a second power transmission assembly, a fatigue test device and a force sensor arranged and connected in sequence along a vertical upward direction, wherein the fatigue test device is used for being repeatedly clamped by the caliper; the force sensor is used for testing the clamping force value of the caliper; and the first power transmission assembly drives the fatigue test device and the force sensor to reciprocate in the vertical direction through the second power transmission assembly. In the present application, when the force sensor is located between two disc pieces of the caliper, the two disc pieces of the caliper are close to each other and clamp the force sensor, the force sensor measures the specific value of the braking force of the caliper, and transmits the measurement result to a main controller to obtain the specific value of the braking force of the caliper; and the technical problem that the specific value of the clamping force of the caliper cannot be obtained in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of brake testing technology, and in particular to a caliper durability testing fixture. Background Technology

[0002] As a crucial actuator assembly in the automotive braking system, the automotive brake caliper is used to control the safe braking of the vehicle; as an important component of automotive braking, fatigue strength testing of the caliper is extremely important.

[0003] Patent document CN202010681734.6 discloses a brake fatigue strength testing tool. In this prior art, maintenance personnel judge whether the clamping force of the caliper meets the requirements by observing the position of the triangular tip. When the triangular tip and the triangular jaw are in close contact, the maintenance personnel judge that the clamping force of the caliper meets the requirements. When there is a gap between the triangular tip and the triangular jaw, the maintenance personnel judge that the clamping force of the caliper does not meet the requirements. However, judging the clamping force of the caliper solely based on the ease with which the triangular tip and the triangular jaw come into contact only allows the maintenance personnel to know the approximate magnitude of the clamping force, but not the specific value of the clamping force.

[0004] In summary, the technical problem with the existing technology is that when maintenance personnel use the existing brake fatigue strength testing tools, they cannot obtain the specific value of the caliper's clamping force. Summary of the Invention

[0005] In view of the technical problem that maintenance personnel cannot obtain the specific value of the clamping force of the caliper when testing the clamping force of the caliper using the existing brake fatigue strength testing tools, the present invention provides a caliper durability testing fixture.

[0006] This invention is achieved through the following technical solution:

[0007] A caliper durability testing fixture includes a first power transmission assembly, a second power transmission assembly, a fatigue testing device, and a force sensor, which are sequentially arranged and connected along a vertically upward direction.

[0008] Among them, the fatigue testing device is used for repeated clamping by calipers;

[0009] Force sensors are used to test the clamping force of calipers;

[0010] The first power transmission component drives the fatigue testing device and force sensor to reciprocate in the vertical direction via the second power transmission component.

[0011] Furthermore, the fatigue testing device includes a fixed frame, and a trapezoidal block, a left top block, and a right top block movably disposed within the fixed frame. The trapezoidal block is disposed between the left top block and the right top block in the horizontal direction. The left top block and the right top block are restricted by the contour of the fixed frame and can only move in the horizontal direction, while the trapezoidal block is movable in the vertical direction within the fixed frame.

[0012] The trapezoidal block has a first inclined surface and a second inclined surface on both sides. With the vertical line as the axis of symmetry, the first and second inclined surfaces are mirror-symmetrically arranged, and both the first and second inclined surfaces form an angle with the vertical direction. The left top block has a third inclined surface, which slides in contact with the first inclined surface. The right top block has a fourth inclined surface, which slides in contact with the second inclined surface.

[0013] Furthermore, the fatigue testing device is provided with a first force-bearing surface and a second force-bearing surface, and there is a gap between the first force-bearing surface and the second force-bearing surface. The direction from the first force-bearing surface to the second force-bearing surface is parallel to the horizontal direction.

[0014] The force sensor has a first sensing surface and a second sensing surface on its two sides respectively. The direction from the first sensing surface to the second sensing surface is horizontal. The first sensing surface is parallel to the first force-bearing surface, and the second sensing surface is parallel to the second force-bearing surface. The force sensor is connected to the main controller. The force sensor converts the pressure on the first sensing surface and the second sensing surface into an electrical signal and outputs it to the main controller.

[0015] The caliper durability test fixture is provided with a first preset position and a second preset position. The direction from the first preset position to the second preset position is parallel to the horizontal direction. The fatigue testing device and the force sensor are both located between the first preset position and the second preset position. During the process of the first power transmission component driving the fatigue testing device and the force sensor to move in the vertical direction through the second power transmission component, the first sensing surface and the first force-bearing surface are successively located at the first preset position, and the second sensing surface and the second force-bearing surface are successively located at the second preset position. When the first sensing surface reaches the first preset position, the second sensing surface reaches the second preset position, and when the first force-bearing surface reaches the first preset position, the second force-bearing surface reaches the second preset position.

[0016] Furthermore, the fatigue testing device also includes a left friction plate and a right friction plate, with the left top block and the right top block located between the left friction plate and the right friction plate;

[0017] A first spring is provided between the left top block and the left friction plate, with one end of the first spring abutting against the left top block and the other end abutting against the left friction plate. A second spring is provided between the right top block and the right friction plate, with one end of the second spring abutting against the right top block and the other end abutting against the right friction plate.

[0018] Furthermore, it also includes a bracket, on which a sensor mounting bracket is provided, on which a laser displacement sensor is provided, and on which a reflector is provided on the left or right friction plate;

[0019] The laser displacement sensor is connected to the main controller. When the displacement value between the signal end of the laser displacement sensor and the reflector reaches the preset value, the main controller controls the caliper durability test fixture to power off and stop.

[0020] Furthermore, a limiting through hole is formed on the fixing frame along the horizontal direction, and the hole wall of the limiting through hole forms a first limiting surface and a second limiting surface. The direction of the first limiting surface pointing to the second limiting surface is parallel to the vertical direction.

[0021] The left top block and the right top block are respectively disposed in the limiting through hole; along the vertical direction, the left top block and the right top block are respectively restricted between the first limiting surface and the second limiting surface; the left top block and the right top block respectively form a clearance fit with the limiting through hole, wherein the position of the clearance fit is restricted between the first limiting surface and the second limiting surface.

[0022] Furthermore, a first through hole is provided at the top of the fixing frame, extending vertically, and a second through hole is provided at the bottom of the fixing frame, extending vertically. A limiting through hole is located between the first and second through holes and communicates with both holes vertically. The lower end of the trapezoidal block is movably disposed in the limiting through hole, and the upper end of the trapezoidal block is movably disposed in the first through hole. A receiving hole extending vertically is also provided at the bottom of the fixing frame.

[0023] The second power transmission assembly includes a motor, a reducer, a coupling, a ball screw, a push block, and a push rod. The motor, reducer, coupling, and ball screw are arranged in sequence along a vertically upward direction. The output end of the motor is coaxially connected to the input end of the reducer. The output end of the reducer is coaxially connected to the bottom end of the ball screw through the coupling. The push block is sleeved and fixed outside the nut seat of the ball screw. The top end of the ball screw is connected to the receiving hole through a bearing. One end of the push rod is connected to the lower end of the trapezoidal block, and the other end of the push rod passes through the second through hole and is connected to the push block.

[0024] Furthermore, the first power transmission assembly is located below the support, and includes a cylinder, a support rod, a base plate, and a support plate; the base plate and the support plate are parallel to each other, the base plate is located below the support plate, the base plate is connected to the cylinder body of the cylinder, the support plate is connected to the reducer, and the support plate is also provided with a third through hole in the vertical direction, one end of the support rod is connected to the support, and the other end penetrates the third through hole and is connected to the base plate, and the outer surface of the support rod is movable relative to the hole wall of the third through hole; the output shaft of the cylinder is connected to the lower surface of the support plate.

[0025] Furthermore, the cylinder body is equipped with at least an upper limit switch and a lower limit switch, with the lower limit switch located below the upper limit switch;

[0026] The upper limit switch, lower limit switch, and cylinder input terminals are respectively connected to the main controller;

[0027] When the piston inside the cylinder moves to the position of the upper limit switch or the lower limit switch, the main controller controls the cylinder input to cut off the air supply.

[0028] Furthermore, the bottom of the fixed frame is connected to a slide rail arranged in a vertical direction, and a slider is installed on the bracket, with the slider and the slide rail forming a sliding pair.

[0029] Compared with the prior art, the advantages of this invention are:

[0030] 1. In this solution, the fatigue testing device can be approximated as the brake fatigue strength testing tool in the prior art. Furthermore, this solution adds, based on the prior art, a force sensor for measuring the clamping force of the caliper, and a first power transmission component and a second power transmission component for driving the fatigue testing device and the force sensor to reciprocate up and down. The first power transmission component drives the fatigue testing device and the force sensor to reciprocate up and down through the second power transmission component, allowing the caliper durability testing fixture to switch between the periodic experimental testing step and the clamping force detection step. When the force sensor is located between the two discs of the caliper, the two discs of the caliper approach each other and clamp the force sensor. The force sensor measures the specific value of the caliper's braking force and transmits the measurement result to the main controller to obtain the specific magnitude of the caliper's braking force. In summary, this solution solves the technical problem in the prior art where maintenance personnel using brake fatigue strength testing tools cannot obtain the specific value of the caliper's clamping force when testing the caliper's clamping force. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the first power transmission assembly, the second power transmission assembly, the fatigue testing device, and the force sensor.

[0032] Figure 2 A schematic diagram of the overall structure of the caliper durability test fixture;

[0033] Figure 3 This is a schematic diagram of the fatigue testing device.

[0034] Figure 4 This is a schematic diagram of the fixed frame structure;

[0035] Figure 5 for Figure 4 A structural diagram from another perspective;

[0036] Figure 6 This is a schematic diagram of the structure of the first power transmission assembly;

[0037] Figure 7 Electrical connection diagram;

[0038] Figure 8 A schematic diagram of the structure for mounting calipers in a caliper durability test fixture.

[0039] Reference numerals: First power transmission assembly (1), Second power transmission assembly (2), Fatigue testing device (3), Force sensor (4), Fixing frame (5), Trapezoidal block (6), Left top block (7), Right top block (8), First inclined plane (9), Second inclined plane (10), Third inclined plane (11), Fourth inclined plane (12), First force-bearing surface (13), Second force-bearing surface (14), First sensing surface (15), Second sensing surface (16), Left friction plate (17), Right friction plate (18), First spring (19), Second spring (20), Bracket (21), Sensor mounting Frame (22), laser displacement sensor (23), reflector (24), main controller (25), limit through hole (26), first limit surface (27), second limit surface (28), first through hole (29), second through hole (30), receiving hole (31), motor (32), reducer (33), coupling (34), ball screw (35), push block (36), push rod (37), cylinder (38), support rod (39), base plate (40), support plate (41), upper limit switch (42), lower limit switch (43), slide rail (44), slider (45). Detailed Implementation

[0040] The following detailed, non-limiting description of the invention's technical solutions, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0041] like Figure 1, Figure 8 As shown, a preferred embodiment of the present invention provides a caliper durability testing fixture, comprising a first power transmission assembly 1, a second power transmission assembly 2, a fatigue testing device 3, and a force sensor 4, which are sequentially arranged and connected along a vertically upward direction. The fatigue testing device 3 is used to be repeatedly clamped by the caliper; the force sensor 4 is used to test the clamping force of the caliper; the first power transmission assembly 1 drives the fatigue testing device 3 and the force sensor 4 to reciprocate in the vertical direction through the second power transmission assembly 2.

[0042] The output end of the first power transmission component 1 is retractable in the vertical direction. When the output end of the first power transmission component 1 extends upward, it can lift the second power transmission component 2, thereby driving the fatigue testing device 3 and the force sensor 4 to move vertically upward through the second power transmission component 2. When the output end of the first power transmission component 1 retracts downward, it drives the second power transmission component 2, the fatigue testing device 3, and the force sensor 4 to move downward. The structure of the first power transmission component 1 can adopt one of the existing technologies. In this embodiment, the specific structure of the first power transmission component 1 is detailed below.

[0043] The second power transmission component 2 is disposed between the first power transmission component 1 and the fatigue testing device 3. The connection method between the second power transmission component 2 and the first power transmission component 1 and the fatigue testing device 3 is detailed below. The structure of the second power transmission component 2 can adopt one of the existing technologies. In this embodiment, the specific structure of the second power transmission component 2 is detailed below.

[0044] See further Figures 1-3 The fatigue testing device 3 is used to withstand the clamping force of the caliper. In this embodiment, the fatigue testing device 3 is provided with a first force-bearing surface 13 and a second force-bearing surface 14. There is a gap between the first force-bearing surface 13 and the second force-bearing surface 14. The direction from the first force-bearing surface 13 to the second force-bearing surface 14 is parallel to the horizontal direction. Further, as a preferred embodiment, both the first force-bearing surface 13 and the second force-bearing surface 14 are planes parallel to the vertical direction. The hardness of the first force-bearing surface 13 and the second force-bearing surface 14 is greater than the hardness of the caliper disc. Other structures of the fatigue testing device 3 can adopt one of the existing technologies. In this embodiment, the specific structure of the fatigue testing device 3 is detailed below.

[0045] Force sensor 4 is mounted on fatigue testing device 3. In this preferred embodiment, a magnet is provided at the bottom of force sensor 4, and force sensor 4 is magnetically attracted to fatigue testing device 3 by the magnet. Force sensor 4 is a device that converts the pressure value into an electrical signal. Its structure is existing technology and will not be described in detail here. In this embodiment, a first sensing surface 15 and a second sensing surface 16 are respectively provided on both sides of force sensor 4. The direction from the first sensing surface 15 to the second sensing surface 16 is horizontal. The first sensing surface 15 is parallel to the first force-bearing surface 13, and the second sensing surface 16 is parallel to the second force-bearing surface 14. Force sensor 4 is connected to main controller 25. When the first sensing surface 15 and the second sensing surface 16 are clamped by the disc of the caliper, force sensor 4 converts the pressure borne by the first sensing surface 15 and the second sensing surface 16 into an electrical signal and outputs it to main controller 25.

[0046] See further Figures 1-3 The caliper durability test fixture is also provided with a first preset position and a second preset position. The direction from the first preset position to the second preset position is parallel to the horizontal direction. In this embodiment, the first preset position and the second preset position are configured according to the actual use situation. For example, the first preset position and the second preset position are located between the two discs of the caliper. The fatigue test device 3 and the force sensor 4 are both located between the first preset position and the second preset position. During the process of the first power transmission component 1 driving the fatigue test device 3 and the force sensor 4 to move in the vertical direction through the second power transmission component 2, the first sensing surface 15 and the first force-bearing surface 13 are successively located at the first preset position, and the second sensing surface 16 and the second force-bearing surface 14 are successively located at the second preset position. When the first sensing surface 15 reaches the first preset position, the second sensing surface 16 reaches the second preset position, and when the first force-bearing surface 13 reaches the first preset position, the second force-bearing surface 14 reaches the second preset position.

[0047] In use, the caliper is fitted onto the caliper durability test fixture. The first power transmission assembly 1 drives the fatigue testing device 3 and the force sensor 4 vertically upward through the second power transmission assembly 2 until the force sensor 4 is positioned above the caliper. The fatigue testing device 3 is located between the two discs of the caliper. At this time, the two discs of the caliper repeatedly clamp the fatigue testing device 3, that is, one disc of the caliper presses against the first force-bearing surface 13, and the other disc of the caliper presses against the second force-bearing surface 14. The number of times the caliper repeatedly clamps the fatigue testing device 3 can be determined according to the preset fatigue life of the caliper. For example, if the preset fatigue life of the caliper brake is 600,000 cycles, then in this embodiment, the number of times the caliper repeatedly clamps the fatigue testing device 3 is set. The cycle count is 600,000 times, and this process is considered as the periodic test step of the caliper. The first power transmission component 1 drives the fatigue testing device 3 and the force sensor 4 to move vertically downward through the second power transmission component 2 until the force sensor 4 is located between the two discs of the caliper and the fatigue testing device 3 is located below the caliper. At this time, the two discs of the caliper clamp the two sides of the force sensor 4, that is, one disc of the caliper presses the first sensing surface 15 and the other disc of the caliper presses the second sensing surface 16. The force sensor 4 converts the pressure borne by the first sensing surface 15 and the second sensing surface 16 into an electrical signal and outputs it to the main controller 25. The main controller records or displays the specific value of the caliper clamping force. This process is considered as the clamping force detection step of the caliper.

[0048] Existing patent document CN202010681734.6 discloses a brake fatigue strength testing tool. In this prior art, maintenance personnel judge whether the clamping force of the caliper meets the requirements by observing the position of the triangular tip. When the triangular tip and the triangular jaw are in close contact, the maintenance personnel judge that the clamping force of the caliper meets the requirements. When there is a gap between the triangular tip and the triangular jaw, the maintenance personnel judge that the clamping force of the caliper does not meet the requirements. However, judging the clamping force of the caliper solely based on the ease with which the triangular tip and the triangular jaw come into contact only allows the maintenance personnel to know the approximate clamping force of the caliper. Since the brake fatigue strength testing tool lacks a component for measuring the specific value of the caliper clamping force, the specific value of the caliper clamping force cannot be obtained.

[0049] In summary, the technical problem with the existing technology is that when maintenance personnel use the existing brake fatigue strength testing tools, they cannot obtain the specific value of the caliper clamping force when testing the clamping force of the caliper.

[0050] In this embodiment, the fatigue testing device 3 can be approximated as a brake fatigue strength testing tool in the prior art. Furthermore, this embodiment adds, based on the prior art, a force sensor 4 for measuring the clamping force of the caliper, and a first power transmission assembly 1 and a second power transmission assembly 2 for driving the fatigue testing device 3 and the force sensor 4 to reciprocate up and down. The first power transmission assembly 1 drives the fatigue testing device 3 and the force sensor 4 to reciprocate up and down through the second power transmission assembly 2, allowing the caliper durability testing fixture to switch between the periodic experimental testing step and the clamping force detection step. When the force sensor 4 is located between the two discs of the caliper, the two discs of the caliper approach each other and clamp the force sensor 4. The force sensor 4 measures the specific value of the caliper's braking force and transmits the measurement result to the main controller to obtain the specific value of the caliper's braking force. In summary, this embodiment solves the technical problem in the prior art where maintenance personnel cannot obtain the specific value of the caliper's clamping force when testing the caliper's clamping force using a brake fatigue strength testing tool.

[0051] Furthermore, in this embodiment, the fatigue testing device 3 also includes a left friction plate 17 and a right friction plate 18, with the left top block 7 and the right top block 8 both located between the left friction plate 17 and the right friction plate 18. During the periodic test step, one of the discs of the caliper presses the left top block 7 through the left friction plate 17, and the other disc of the caliper presses the right top block 8 through the right friction plate 18. The thickness of the left friction plate 17 and the thickness of the right friction plate 18 are equal, and the thickness of the left friction plate 17 and the thickness of the right friction plate 18 can be configured according to the usage. For example, the caliper durability testing fixture can be configured with several different specifications of left friction plates 17 and right friction plates 18 for use. During the use of the caliper durability testing fixture, the left friction plate 17 and the right friction plate 18 are used to simulate the friction plates on both sides of a car wheel.

[0052] In actual use, as the number of times the vehicle brakes increases, the friction pads on both sides of the wheel are gradually worn and their thickness gradually decreases. In the periodic test steps of this caliper durability test fixture, the left friction pad 17 and the right friction pad 18 cannot be replaced once inserted until the end of the test. Therefore, how to simulate the process of friction pads gradually wearing down and thinning in the periodic test steps is a technical problem that needs to be solved. This technical problem is solved by the following technical solution.

[0053] The fatigue testing device 3 includes a fixed frame 5, and a trapezoidal block 6, a left top block 7, and a right top block 8 movably disposed within the fixed frame 5. The trapezoidal block 6 is positioned between the left top block 7 and the right top block 8 along the horizontal direction. The left top block 7 and the right top block 8 are restricted by the contour of the fixed frame 5 and can only move along the horizontal direction. The trapezoidal block 6 is movable along the vertical direction within the fixed frame 5. The trapezoidal block 6 has a first inclined surface 9 and a second inclined surface 10 on both sides. With the vertical line as the axis of symmetry, the first inclined surface 9 and the second inclined surface 10 are mirror-symmetrically arranged, and both the first inclined surface 9 and the second inclined surface 10 form an angle with the vertical direction. The left top block 7 has a third inclined surface 11, which slides in contact with the first inclined surface 9. The right top block 8 has a fourth inclined surface 12, which slides in contact with the second inclined surface 10.

[0054] Along the vertically downward direction, the first inclined surface 9 and the second inclined surface 10 can be close to each other or far apart. In this embodiment, along the vertically downward direction, the first inclined surface 9 and the second inclined surface 10 are far apart; correspondingly, along the vertically downward direction, the third inclined surface 11 and the fourth inclined surface 12 are far apart; and the first inclined surface 9, the second inclined surface 10, the third inclined surface 11 and the fourth inclined surface 12 are all planes.

[0055] The structure composed of the left top block 7, the trapezoidal block 6, and the right top block 8 is equivalent to the brake disc of a vehicle. The left friction pad 17 and the right friction pad 18 are equivalent to the two friction pads of the vehicle. The left friction pad 17 presses against the left top block 7, and the right friction pad 18 presses against the right top block 8, which is equivalent to the two friction pads of the vehicle approaching each other and pressing against the brake disc during the actual braking process of the vehicle. In this embodiment, the trapezoidal block 6 moves downward, causing the left top block 7 and the right top block 8 to approach each other. The distance between the left top block 7 and the left friction pad 17 and the distance between the right top block 8 and the right friction pad 18 increase respectively, thereby simulating the process of the two friction pads of the vehicle gradually thinning during the actual braking process of the vehicle.

[0056] Further reference Figures 3-5 As mentioned above, the left top block 7 and the right top block 8 are restricted by the outline of the fixing frame 5 and can only move in the horizontal direction. Specifically, in this embodiment, the fixing frame 5 has a limiting through hole 26 extending in the horizontal direction. The hole wall of the limiting through hole 26 forms a first limiting surface 27 and a second limiting surface 28. The direction of the first limiting surface 27 pointing to the second limiting surface 28 is parallel to the vertical direction. The left top block 7 and the right top block 8 are respectively disposed in the limiting through hole 26. Furthermore, in the vertical direction, the left top block 7 and the right top block 8 are respectively restricted between the first limiting surface 27 and the second limiting surface 28. In further embodiment, the left top block 7 and the right top block 8 form a clearance fit with the limiting through hole 26, wherein the position of the clearance fit is restricted between the first limiting surface 27 and the second limiting surface 28.

[0057] Further reference Figures 3-5 As mentioned above, the trapezoidal block 6 is movable vertically within the fixing frame 5. Specifically, in this embodiment, the top of the fixing frame 5 is provided with a first through hole 29, which extends vertically, and the bottom of the fixing frame 5 is provided with a second through hole 30, which also extends vertically. A limiting through hole 26 is located between the first through hole 29 and the second through hole 30, and communicates with both. The lower end of the trapezoidal block 6 is movably disposed vertically within the limiting through hole 26, and the upper end of the trapezoidal block 6 is movably disposed vertically within the first through hole 29. The function of the second through hole 30 is detailed later.

[0058] Assuming the caliper disc in contact with the left friction plate 17 is the left disc, and the caliper disc in contact with the right friction plate 18 is the right disc, during use, the left disc, through the left friction plate 17, presses against the left top block 7, causing the third inclined surface 11 to press against the first inclined surface 9; the right disc, through the right friction plate 18, presses against the right top block 8, causing the fourth inclined surface 12 to press against the second inclined surface 10. When the trapezoidal block 6 moves vertically downward, the left disc, through the left friction plate 17, pushes the left top block 7 horizontally toward the right top block 8, and the right disc, through the right friction plate 18, pushes the right top block 8 horizontally toward the left top block 7. That is, the left top block 7 and the right top block 8 move closer to each other horizontally, and the distance between the third inclined surface 11 and the fourth inclined surface 12 gradually decreases. Correspondingly, the distance between the left friction plate 17 and the right friction plate 18... The thickness of the friction pads gradually decreases. Therefore, to maintain contact between the left disc and the left friction pad 17, and between the right disc and the right friction pad 18, the lengths extending from the left disc towards the left friction pad 17 and from the right disc towards the right friction pad 18 must be correspondingly increased. In summary, during the use of the caliper durability test fixture, where the left friction pad 17 and the right friction pad 18 cannot be replaced once inserted until the end of the experiment, this embodiment uses the vertical movement of the trapezoidal block 6 to change the distance between the left and right friction pads 17 and 18, bringing them closer together. This increases the displacement of the left disc towards the left friction pad 17 and the right disc towards the right friction pad 18, simulating the gradual wear and thinning of the friction pads during the use of a vehicle caliper. Therefore, in summary, this embodiment solves the technical problem of how to simulate the gradual decrease in the thickness of the friction pads.

[0059] Furthermore, in the above technical solution, when the trapezoidal block 6 moves vertically upward, the left top block 7 and the right top block 8 will move away from each other in the horizontal direction, which in turn will cause the left friction plate 17 and the right friction plate 18 to move away from each other. This process is used to return the left friction plate 17 and the right friction plate 18 to their original positions after the periodic experimental test step is completed.

[0060] As mentioned above, the left disc of the caliper presses against the left top block 7 via the left friction plate 17, and the right disc of the caliper presses against the right top block 8 via the right friction plate 18. Therefore, after the periodic test step is completed and the caliper retracts the left and right discs, the left friction plate 17 and the left top block 7 will be in contact with each other, and the right friction plate 18 and the right top block 8 will be in contact with each other. Along the horizontal direction from the left friction plate 17 to the right friction plate 18, the gaps between the left friction plate 17 and the left top block 7, and between the right friction plate 18 and the right top block 8, are too small. This makes it difficult for the gripping clamp to insert into the gaps between the left friction plate 17 and the left top block 7, and between the right friction plate 18 and the right top block 8, resulting in the technical problem that the left friction plate 17 and the right friction plate 18 are difficult to remove. In this embodiment, this technical problem is solved by the following technical solution.

[0061] Further reference Figures 1-3 A first spring 19 is provided between the left top block 7 and the left friction plate 17. One end of the first spring 19 abuts against the left top block 7 and the other end abuts against the left friction plate 17. A second spring 20 is provided between the right top block 8 and the right friction plate 18. One end of the second spring 20 abuts against the right top block 8 and the other end abuts against the right friction plate 18.

[0062] The number of first springs 19 and second springs 20 can be set according to actual conditions. In this embodiment, there are three first springs 19 and three second springs 20. When the left disc presses against the left top block 7 by the left friction plate 17 and the right disc presses against the right top block 8 by the right friction plate 18, the gap between the left friction plate 17 and the left top block 7 and the gap between the right friction plate 18 and the right top block 8 decrease, and the first springs 19 and the second springs 20 contract. When the caliper retracts the left and right discs, the first springs 19 and the second springs 20 contract. When the compressive force on spring 20 disappears, the first spring 19 and the second spring 20 extend due to their own elastic force, thereby increasing the gap between the left friction plate 17 and the left top block 7, and the gap between the right friction plate 18 and the right top block 8. The gripping clamps extend into the gaps between the left friction plate 17 and the left top block 7 and the right friction plate 18 and the right top block 8, respectively, and then grip the left friction plate 17 and the right friction plate 18 upwards and remove them. In summary, this embodiment solves the technical problem that the left friction plate 17 and the right friction plate 18 are difficult to remove.

[0063] Furthermore, to prevent the first spring 19 and the second spring 20 from shifting in the vertical direction, this embodiment also includes the following technical solution:

[0064] The left top block 7 has a left blind hole (not shown) on the side facing the left friction plate 17. The left blind hole is used to accommodate one end of the first spring 19. The right top block 8 has a right blind hole (not shown) on the side facing the right friction plate 18. The right blind hole is used to accommodate one end of the second spring 20. Furthermore, in the natural state, that is, when the first spring 19 and the second spring 20 are not under force, the end of the first spring 19 away from the left friction plate 17 extends out of the left blind hole, and the end of the second spring 20 away from the right friction plate 18 extends out of the right blind hole.

[0065] In this embodiment, one end of the first spring 19 extends into the left blind hole, and one end of the second spring 20 extends into the right blind hole. During the process of the left friction plate 17 and the right friction plate 18 being lifted upward or placed downward by the gripping clamp, the first spring 19 is restricted by the wall of the left blind hole, and the second spring 20 is restricted by the wall of the right blind hole. Even if the first spring 19 is rubbed by the left friction plate 17 and the second spring 20 is rubbed by the right friction plate 18, the first spring 19 and the second spring 20 will not shift in the vertical direction. Therefore, this embodiment solves the technical problem of how to prevent the first spring 19 and the second spring 20 from shifting in the vertical direction.

[0066] Furthermore, in actual vehicle use, the thickness of the friction pads has a limit. When the thickness of the friction pads reaches the limit, the vehicle should stop and an alarm should be triggered; otherwise, there will be a safety hazard. As mentioned in the foregoing content of this embodiment, by bringing the left friction pad 17 and the right friction pad 18 closer to each other, and extending the displacement of the left disc towards the left friction pad 17 and the displacement of the right disc towards the right friction pad 18, the process of the friction pads gradually wearing down and thinning during the use of the vehicle calipers can be simulated. Therefore, in this embodiment, how to simulate the process of the vehicle stopping when the thickness of the friction pads decreases to the limit is a technical problem that needs to be solved. This technical problem is solved by the following technical solution.

[0067] Further reference Figure 2 , Figure 3 and Figure 7 The caliper durability test fixture also includes a bracket 21, on which a sensor mounting bracket 22 is mounted, and a laser displacement sensor 23 is mounted on the sensor mounting bracket 22. A reflector 24 is mounted on the left friction plate 17 or the right friction plate 18. The laser displacement sensor 23 is connected to the main controller 25. When the displacement value between the signal end of the laser displacement sensor 23 and the reflector 24 reaches a preset value, the main controller 25 controls the caliper durability test fixture to power off and stop.

[0068] The laser displacement sensor 23 emits a laser beam in the direction towards the reflector 24. After the laser beam contacts the reflector 24, it is reflected back to the receiving end of the laser displacement sensor 23, thereby measuring the displacement value between the emitting end of the laser displacement sensor 23 and the reflector 24. As the trapezoidal block 6 moves vertically downward and the distance between the left friction plate 17 and the right friction plate 18 gradually decreases, the laser displacement sensor 23 monitors the horizontal distance moved by either the left friction plate 17 or the right friction plate 18. When the horizontal distance moved by either the left friction plate 17 or the right friction plate 18 reaches a preset distance, the main controller... 25. Power off and stop the caliper durability test fixture; that is, this embodiment simulates the reduction in the thickness of the friction pads during actual vehicle use by monitoring the distance the left friction pad 17 or the right friction pad 18 moves horizontally. When the left friction pad 17 or the right friction pad 18 moves horizontally to a preset distance, it simulates the reduction in the thickness of the friction pads to a limit value during actual vehicle use. Power off and stop the caliper durability test fixture, simulating the shutdown process during actual vehicle use. Therefore, this embodiment solves the technical problem of how to simulate the vehicle shutdown process when the thickness of the friction pads decreases to a limit value.

[0069] Furthermore, as mentioned above, the trapezoidal block 6 moves vertically within the fixed frame 5. The upper end of the trapezoidal block 6 is movably positioned vertically within the first through hole 29, and the lower end of the trapezoidal block 6 is movably positioned vertically within the limiting through hole 26, causing the left top block 7 and the right top block 8 to move closer to or further away from each other. In this embodiment, the vertical movement of the trapezoidal block 6 is driven by the second power transmission assembly. The specific composition of the second power transmission assembly is detailed in the following technical solution:

[0070] Further reference Figures 4-5 The bottom of the fixed frame 5 is also provided with a vertically extending receiving hole 31; the second power transmission assembly includes a motor 32, a reducer 33, a coupling 34, a ball screw 35, a push block 36, and a push rod 37. The motor 32, reducer 33, coupling 34, and ball screw 35 are arranged in sequence along the vertical upward direction. The output end of the motor 32 is coaxially connected to the input end of the reducer 33. The output end of the reducer 33 is coaxially connected to the bottom end of the ball screw 35 through the coupling 34. The push block 36 is sleeved and fixed outside the nut seat of the ball screw 35. The top end of the ball screw 35 is connected to the receiving hole 31 through a bearing. One end of the push rod 37 is connected to the lower end of the trapezoidal block 6, and the other end of the push rod 37 passes through the second through hole 30 and is connected to the push block 36.

[0071] In use, the motor 32 starts and drives the input end of the reducer 33 to rotate. The output end of the reducer 33 drives the body of the ball screw 35 to rotate through the coupling 34. The nut seat sleeved on the body of the ball screw 35 is restricted by the push rod 37 and the fixed frame 5 and cannot rotate along the circumference of the body. This causes the nut seat to move vertically along the axis of the body during the rotation of the body. In this embodiment, it is specified that when the body rotates clockwise, the nut seat moves vertically upward along the body, and when the body rotates counterclockwise, the nut seat moves vertically downward along the body. The vertical movement of the nut seat drives the push block 36 to move vertically. The push block 36 drives the trapezoidal block 6 to move vertically through the push rod 37, thereby causing the left top block 7 and the right top block 8 to move closer to or further away from each other.

[0072] Furthermore, in this embodiment, the specific configuration of the first power transmission assembly is detailed in the following technical solution:

[0073] Reference Figure 1 , Figure 2 , Figure 6 The first power transmission assembly is located below the bracket 21. The first power transmission assembly includes a cylinder 38, a support rod 39, a base plate 40, and a support plate 41. The base plate 40 and the support plate 41 are parallel to each other, and the base plate 40 is located below the support plate 41. The base plate 40 is connected to the cylinder body of the cylinder 38, and the support plate 41 is connected to the reducer 33. The support plate 41 is also provided with a third through hole in the vertical direction. One end of the support rod 39 is connected to the bracket 21, and the other end penetrates the third through hole and is connected to the base plate 40. Furthermore, the outer surface of the support rod 39 is movable relative to the hole wall of the third through hole. The output shaft of the cylinder 38 is connected to the lower surface of the support plate 41. For example, the output shaft of the cylinder 38 is connected to the lower surface of the support plate 41 by screws.

[0074] When in use, cylinder 38 is started, the cylinder body of cylinder 38 is connected to base plate 40, the output end of cylinder 38 extends and pushes the support plate 41 to move upward. The support plate 41 drives the second power transmission assembly 2 to move upward as a whole through reducer 33. The output end of cylinder gradually retracts, driving the second power transmission assembly 2 to move downward. Correspondingly, the fatigue testing device 3 and force sensor 4 installed on the second power transmission assembly 2 also move up and down.

[0075] Furthermore, how to prevent the position of the cylinder output end from being excessively upward or downward in the vertical direction is a technical problem that needs to be solved. This technical problem is solved by the following technical solution.

[0076] Reference Figure 6 , Figure 7The cylinder body of cylinder 38 is equipped with at least an upper limit switch 42 and a lower limit switch 43, with the lower limit switch 43 located below the upper limit switch 42. The upper limit switch 42, the lower limit switch 43, and the input terminals of cylinder 38 are respectively connected to the main controller 25. When the piston in the cylinder body moves to the position of the upper limit switch 42 or the position of the lower limit switch 43, the main controller 25 controls the input terminal of cylinder 38 to stop working.

[0077] Furthermore, in this embodiment, at least one third limit switch may be provided between the upper limit switch 42 and the lower limit switch 43 to control the input end of the cylinder 38 to stop working at other preset positions.

[0078] In this embodiment, the piston is connected to the output end of the cylinder. In the vertical direction, the piston of the cylinder can only move between the upper limit switch 42 and the lower limit switch 43. This embodiment restricts the vertical position of the piston in the vertical direction, thereby limiting the output end of the cylinder from moving excessively upward or downward in the vertical direction, thus solving the technical problem of how to avoid the output end of the cylinder moving excessively upward or downward in the vertical direction.

[0079] Furthermore, how to guide the fixed frame 5 along the vertical direction during the up-and-down movement of the fixed frame 5 is a technical problem that needs to be solved. This technical problem is solved by the following technical solution.

[0080] Reference Figure 1 The bottom of the fixed frame 5 is connected to a slide rail 44 arranged in a vertical direction, and a slider 45 is provided on the bracket 21. The slider 45 and the slide rail 44 form a sliding pair.

[0081] During the up-and-down movement of the fixed frame 5, the slider 45 slides along the slide rail 44 in the vertical direction. The slider 45 is connected to the bracket 21, and the slide rail 44 is connected to the fixed frame. Therefore, the fixed frame 5 is restricted by the sliding pair and can only move vertically upward or vertically downward. Thus, this embodiment solves the technical problem of how to guide the fixed frame 5 in the vertical direction during the up-and-down movement of the fixed frame 5.

[0082] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A caliper durability testing fixture, characterized in that, It includes a first power transmission assembly (1), a second power transmission assembly (2), a fatigue testing device (3), and a force sensor (4) that are arranged and connected in sequence along the vertical upward direction. Among them, the fatigue testing device (3) is used to be repeatedly clamped by the caliper; The force sensor (4) is used to test the clamping force of the caliper; The first power transmission assembly (1) drives the fatigue testing device (3) and the force sensor (4) to reciprocate in the vertical direction through the second power transmission assembly (2); The fatigue testing device (3) includes a fixed frame (5), and a trapezoidal block (6), a left top block (7), and a right top block (8) movably disposed within the fixed frame (5). The trapezoidal block (6) is disposed between the left top block (7) and the right top block (8) in the horizontal direction. The left top block (7) and the right top block (8) are restricted by the outline of the fixed frame (5) and can only move in the horizontal direction. The trapezoidal block (6) can move in the vertical direction within the fixed frame (5). The trapezoidal block (6) has a first inclined surface (9) and a second inclined surface (10) on both sides. With the vertical line as the axis of symmetry, the first inclined surface (9) and the second inclined surface (10) are mirror-symmetrically arranged. Furthermore, the first inclined surface (9) and the second inclined surface (10) are at an angle to the vertical direction respectively. The left top block (7) has a third inclined surface (11), which slides in contact with the first inclined surface (9). The right top block (8) has a fourth inclined surface (12), which slides in contact with the second inclined surface (10). The fatigue testing device (3) is provided with a first force-bearing surface (13) and a second force-bearing surface (14). There is a gap between the first force-bearing surface (13) and the second force-bearing surface (14). The direction from the first force-bearing surface (13) to the second force-bearing surface (14) is parallel to the horizontal direction. The force sensor (4) has a first sensing surface (15) and a second sensing surface (16) on its two sides respectively. The direction of the first sensing surface (15) pointing to the second sensing surface (16) is horizontal. The first sensing surface (15) and the first force-bearing surface (13) are parallel. The second sensing surface (16) and the second force-bearing surface (14) are parallel. The force sensor (4) is connected to the main controller (25). The force sensor (4) converts the pressure borne by the first sensing surface (15) and the second sensing surface (16) into an electrical signal and outputs it to the main controller (25). The caliper durability test fixture is provided with a first preset position and a second preset position. The direction from the first preset position to the second preset position is parallel to the horizontal direction. The fatigue test device (3) and the force sensor (4) are both located between the first preset position and the second preset position. During the process of the first power transmission component (1) driving the fatigue test device (3) and the force sensor (4) to move in the vertical direction through the second power transmission component (2), the first sensing surface (15) and the first force-bearing surface (13) are located at the first preset position one after another, and the second sensing surface (16) and the second force-bearing surface (14) are located at the second preset position one after another. When the first sensing surface (15) reaches the first preset position, the second sensing surface (16) reaches the second preset position. When the first force-bearing surface (13) reaches the first preset position, the second force-bearing surface (14) reaches the second preset position.

2. The caliper durability testing fixture according to claim 1, characterized in that, The fatigue testing device (3) also includes a left friction plate (17) and a right friction plate (18), with the left top block (7) and the right top block (8) located between the left friction plate (17) and the right friction plate (18); A first spring (19) is provided between the left top block (7) and the left friction plate (17). One end of the first spring (19) abuts against the left top block (7) and the other end abuts against the left friction plate (17). A second spring (20) is provided between the right top block (8) and the right friction plate (18). One end of the second spring (20) abuts against the right top block (8) and the other end of the second spring (20) abuts against the right friction plate (18).

3. The caliper durability testing fixture according to claim 2, characterized in that, It also includes a bracket (21), a sensor mounting bracket (22) is provided on the bracket (21), a laser displacement sensor (23) is provided on the sensor mounting bracket (22), and a reflector (24) is provided on the left friction plate (17) or the right friction plate (18). The laser displacement sensor (23) is connected to the main controller (25). When the displacement value between the signal end of the laser displacement sensor (23) and the reflector (24) reaches the preset value, the main controller (25) controls the caliper durability test fixture to power off and stop.

4. The caliper durability testing fixture according to claim 3, characterized in that, A limiting through hole (26) is formed on the fixing frame (5) along the horizontal direction. The hole wall of the limiting through hole (26) forms a first limiting surface (27) and a second limiting surface (28). The direction of the first limiting surface (27) pointing to the second limiting surface (28) is parallel to the vertical direction. The left top block (7) and the right top block (8) are respectively disposed in the limiting through hole (26); along the vertical direction, the left top block (7) and the right top block (8) are respectively restricted between the first limiting surface (27) and the second limiting surface (28); the left top block (7) and the right top block (8) form a clearance fit with the limiting through hole (26), wherein the position of the clearance fit is restricted between the first limiting surface (27) and the second limiting surface (28).

5. The caliper durability testing fixture according to claim 4, characterized in that, The top of the fixing frame (5) is provided with a first through hole (29), which extends vertically. The bottom of the fixing frame (5) is provided with a second through hole (30), which extends vertically. A limiting through hole (26) is located between the first through hole (29) and the second through hole (30) in the vertical direction, and communicates with the first through hole (29) and the second through hole (30) respectively. The lower end of the trapezoidal block (6) is movably disposed in the limiting through hole (26) in the vertical direction, and the upper end of the trapezoidal block (6) is movably disposed in the first through hole (29) in the vertical direction. The bottom of the fixing frame (5) is also provided with a receiving hole (31) extending vertically. The second power transmission assembly (2) includes a motor (32), a reducer (33), a coupling (34), a ball screw (35), a push block (36), and a push rod (37). The motor (32), reducer (33), coupling (34), and ball screw (35) are arranged in sequence along the vertical upward direction. The output end of the motor (32) is coaxially connected to the input end of the reducer (33). The output end of the reducer (33) is coaxially connected to the bottom end of the ball screw (35) through the coupling (34). The push block (36) is sleeved and fixed outside the nut seat of the ball screw (35). The top end of the ball screw (35) is connected to the receiving hole (31) through a bearing. One end of the push rod (37) is connected to the lower end of the trapezoidal block (6). The other end of the push rod (37) passes through the second through hole (30) and is connected to the push block (36).

6. The caliper durability testing fixture according to claim 5, characterized in that, The first power transmission assembly (1) is located below the bracket (21). The first power transmission assembly includes a cylinder (38), a support rod (39), a base plate (40), and a support plate (41). The base plate (40) and the support plate (41) are parallel to each other. The base plate (40) is located below the support plate (41). The base plate (40) is connected to the cylinder body of the cylinder (38). The support plate (41) is connected to the reducer (33). The support plate (41) is also provided with a third through hole that runs vertically through it. One end of the support rod (39) is connected to the bracket (21), and the other end passes through the third through hole and is connected to the base plate (40). Furthermore, the outer surface of the support rod (39) is movable relative to the hole wall of the third through hole. The output shaft of the cylinder (38) is connected to the lower surface of the support plate (41).

7. The caliper durability testing fixture according to claim 6, characterized in that, The cylinder body of the cylinder (38) is provided with at least an upper limit switch (42) and a lower limit switch (43), with the lower limit switch (43) located below the upper limit switch (42); The input terminals of the upper limit switch (42), the lower limit switch (43), and the cylinder (38) are respectively connected to the main controller (25); When the piston in the cylinder moves to the position of the upper limit switch (42) or the position of the lower limit switch (43), the main controller (25) controls the input end of the cylinder (38) to cut off the air supply.

8. The caliper durability testing fixture according to claim 7, characterized in that, The bottom of the fixed frame (5) is connected to a slide rail (44) arranged in the vertical direction, and a slider (45) is arranged on the bracket (21). The slider (45) and the slide rail (44) form a sliding pair.

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