A test tool for CEMB residual clamping force

Abstract

The utility model relates to a kind of CEMB residual clamping force test tool, including CEMB test sample, bottom plate, and the first, second support column is protruding in bottom plate upward, first support column is connected CEMB test sample, and push-pull electric cylinder is connected on second support column;The telescopic end of push-pull electric cylinder is fixed with tension sensor, and the brake disc simulation clamp is fixed at the end of tension sensor away from push-pull electric cylinder.Utilize a kind of CEMB residual clamping force test tool designed by the utility model, can solve the problem of unstable reading of large-range force sensor and poor repeatability, small-range force sensor is easy to overrange even damage when testing, the arrangement of force sensor is not conducive to the consistency of test condition, the cost increase caused by the fixture of different models CEMB caliper needing separate design.

Description

Technical Field

[0001] This utility model relates to the field of commercial vehicle braking test technology, specifically to a test fixture for CEMB residual clamping force. Background Technology

[0002] As commercial vehicle braking systems evolve towards electromechanical braking (CEMB), vehicle manufacturers and braking system suppliers are placing higher demands on the residual clamping force after brake release to reduce drag torque, lower energy consumption, and minimize wear on braking components. CEMB calipers typically exert tens of kilonewtons or even higher clamping forces during braking, while the residual clamping force after brake release is often only tens of newtons or lower, representing a significant difference in magnitude.

[0003] In existing testing methods, force sensors are typically placed directly at the location where the CEMB caliper applies clamping force to the brake disc. A large-range force sensor covers the caliper's maximum clamping force range, and the residual clamping force is then read in the released state. This approach has the following problems in practical applications: Large-range force sensors have limited resolution and linearity within the small load measurement range, leading to unstable readings and poor repeatability when testing small residual clamping forces; if a small-range force sensor is used to improve testing accuracy, it is easy to exceed the range or even damage the sensor when the CEMB caliper is subjected to maximum clamping conditions, increasing testing risks and costs; placing the force sensor directly at the caliper clamping position usually requires changing the existing fixture structure of the test bench or modifying the caliper's installation posture, which is detrimental to the consistency of test conditions; different CEMB caliper models have different installation dimensions and brake disc thicknesses, and traditional fixed clamping fixtures lack versatility, often requiring custom fixture design.

[0004] Therefore, existing technologies have shortcomings and need to be improved and developed. Utility Model Content

[0005] The utility model provides a testing fixture for the residual clamping force of CEMB, which solves the problems in the prior art, such as unstable and poor repeatability of readings from large-range force sensors, easy over-range testing or even damage of small-range force sensors, unfavorable arrangement of force sensors to the consistency of test conditions, and increased cost caused by the need to design fixtures separately for different models of CEMB calipers.

[0006] This utility model embodiment provides a testing fixture for the residual clamping force of CEMB (Cyclic Embedded Brake Module), including a CEMB test sample and a base plate. One end of the base plate has a first support column protruding upwards, and the first support column has a first mounting hole. A first bolt is threaded into the first mounting hole to thread the CEMB test sample onto the first support column. The other end of the base plate has a second support column protruding upwards, and the second support column has a second mounting hole. A second bolt is threaded into the second mounting hole to thread a push-pull electric cylinder onto the second support column. A tension sensor is fixed to the telescopic end of the push-pull electric cylinder, and a brake disc simulation clamp is fixed to the end of the tension sensor away from the push-pull electric cylinder. When the telescopic end of the push-pull electric cylinder extends, it is used to place the brake disc simulation clamp into the opening of the CEMB test sample and between the two brake pads of the CEMB test sample.

[0007] Furthermore, a slide rail is fixed on the base plate, and a slider with a limit is slidably connected on the slide rail. The end of the first support column that is not connected to the CEMB test sample is slidably connected to the slider. When the position of the first support column satisfies the requirement that the telescopic end of the push-pull electric cylinder extends to place the brake disc simulation clamp in the opening of the CEMB test sample and between the two brake pads of the CEMB test sample, the slider is limited to the slide rail.

[0008] Furthermore, the slide rail is arranged along the line connecting the first support column and the second support column, and the slider is provided with scale marks, which are used to indicate the installation position of the first support column relative to the second support column.

[0009] Furthermore, the tensile force of the tensile sensor has a test range of [0, 200], and the unit of the test tensile force is kN.

[0010] Furthermore, the tension sensor is arranged along the extension and retraction direction of the push-pull electric cylinder and is a bidirectional tension-compression tension sensor. The first end of the tension sensor is fixed to the extension and retraction end of the push-pull electric cylinder by a threaded connection, and the second end of the tension sensor is fixed to the brake disc simulation clamp by a threaded connection.

[0011] Furthermore, the brake disc simulation clamp is a plate-shaped structure, the thickness of which matches the thickness of the target brake disc adapted to the CEMB test sample, and the brake disc simulation clamp is detachably connected to the tension sensor so that brake disc simulation clamps of different thicknesses can be replaced according to different models of CEMB test samples.

[0012] Furthermore, the bottom of the base plate is provided with several height-adjustable support feet, which are arranged along the four corners of the base plate and are used to adjust the horizontal state of the base plate relative to the ground.

[0013] Beneficial effects:

[0014] As can be seen from the above technical solutions, this utility model provides a testing fixture for CEMB residual clamping force, which has the following beneficial effects:

[0015] 1. Resolving the contradiction of sensor range and improving the testing accuracy of small residual clamping force: This application constructs a rigid force transmission chain through a base plate, a first support column, a second support column, a push-pull electric cylinder, a tension sensor, and a brake disc simulation clamping plate. This converts the residual clamping force of the CEMB caliper on the brake disc into an axial tension force that can be measured by the tension sensor. By limiting the range of the tension sensor to a small range that matches the level of the residual clamping force, the sensor operates in a range with higher resolution and better linearity, avoiding the problems of zero-point drift and large quantization error when measuring small forces with traditional large-range sensors. The residual clamping force itself is much smaller than the maximum clamping force during braking. After the brake is released, the fixture in this application retracts and pulls out the brake disc simulation clamping plate via the push-pull electric cylinder. The tension sensor bears the tension force converted from the residual force, rather than the peak clamping force of the entire braking process. Therefore, it avoids the overload risk of the small-range sensor and allows the small residual force to enter the effective measurement range of the sensor, thereby improving the accuracy and reliability of residual clamping force measurement.

[0016] 2. Constructing a rigid, aligned force transmission path to improve the stability and consistency of test results: This application fixes the push-pull electric cylinder to the second support column and the CEMB test sample to the first support column. The two are connected by a tension sensor and a brake disc simulation clamp, forming a single axial force path from the caliper, friction pad, simulation clamp, tension sensor, and electric cylinder. The tension sensor is arranged along the extension and retraction direction of the push-pull electric cylinder, adopting a bidirectional tension-compression structure, and is connected to the extension and retraction end of the electric cylinder and the brake disc simulation clamp via threaded connections. This ensures that the sensor's measurement axis is highly aligned with the loading direction, reducing the influence of eccentric loads and bending moments on the measurement results. The residual clamping force is strictly converted into axial tension, resulting in a clear force path and high rigidity. This helps reduce test fluctuations introduced by structural deformation and installation errors, thereby improving the repeatability of the test process and the consistency of the data overall.

[0017] 3. Simulating Real Brake Disc Operating Conditions to Improve the Engineering Relevance of Residual Clamping Force Tests: The brake disc simulation clamp is designed as a plate-like structure with a thickness matching the target brake disc thickness adapted to the CEMB test sample, and is connected to the tension sensor via a detachable connector. Through thickness matching design, when the caliper clamps the simulation clamp, the opening amount, clamping stroke, and friction contact position of its brake pads are close to those of a real vehicle using a real brake disc, thus ensuring that the mechanism of residual clamping force generation is consistent with real operating conditions. Subsequent calculations of residual clamping force can directly use the friction coefficient μ provided by the friction pad manufacturer, reducing the need for additional calibration or complex corrections, thereby improving the reference value of the test results for actual drag torque analysis and bench / road testing.

[0018] 4. Universal adaptability and position reproducibility for different CEMB specifications are achieved through the adjustment of the slide rail and slider: A slide rail is set on the base plate, and a slider with limiter is slidably connected on the slide rail. One end of the first support column is slidably connected to the slider. The slide rail is arranged along the line connecting the first and second support columns, and the slider is also equipped with scale markings. By adjusting the slider on the slide rail, the distance between the first and second support columns can be changed, allowing the same tooling to adapt to CEMB calipers of different widths and installation sizes. During adjustment, it is only necessary to ensure that the simulated clamping plate falls between the two friction plates after the push-pull electric cylinder extends, achieving universal structural adaptability. The scale markings provide a quantitative reference for the installation position: For the same model of CEMB test sample, the corresponding scale position can be recorded. During subsequent repeated tests, the sample can be quickly adjusted to the same position according to the scale, reducing the subjectivity of finding the position based on experience, increasing the reproducibility of the installation position, and thus improving the comparability between different batches of tests.

[0019] 5. Leveling the base plate with adjustable support feet reduces interference from external factors on measurements: Several height-adjustable support feet are installed at the bottom of the base plate, arranged along the four corners. By adjusting the support feet, the base plate is kept basically level with respect to the ground. From a mechanical point of view, when the base plate is tilted, the axes of the push-pull electric cylinder and the tension sensor will form an angle with respect to the direction of gravity. The weight of the simulated clamping plate and the gravity component of the caliper structure will introduce additional lateral or non-axial components into the force path, affecting the stability of the sensor output. Leveling the base plate with support feet makes the force transmission path closer to a horizontal state, reducing the additional load caused by gravity and installation deviations. This allows the sensor to mainly bear the axial tension converted from the residual clamping force, which helps to improve the stability and repeatability of the measurement results.

[0020] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered part of the inventive subject matter of this disclosure, provided that such concepts do not contradict each other.

[0021] The foregoing and other aspects, embodiments, and features of the teachings of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0022] The accompanying drawings are not drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a test fixture for CEMB residual clamping force in an embodiment of this application.

[0024] Figure 2 The image shows a side view of the structure of a CEMB test sample mounted on a brake disc simulation clamping plate, which is part of a test fixture for testing the residual clamping force of CEMB in an embodiment of this application.

[0025] Explanation of icon numbers:

[0026] 1. CEMB test sample; 2. Brake pad; 3. First support column; 4. Brake disc simulated clamp; 5. Tension sensor; 6. Push-pull electric cylinder; 7. Second support column; 8. Base plate. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this invention pertains.

[0028] The terms "first," "second," and similar words used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or sets thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0029] In existing testing methods, force sensors are typically placed directly at the location where the CEMB caliper applies clamping force to the brake disc. A large-range force sensor covers the caliper's maximum clamping force range, and the residual clamping force is then read in the released state. This approach has the following problems in practical applications: Large-range force sensors have limited resolution and linearity within the small load measurement range, leading to unstable readings and poor repeatability when testing small residual clamping forces; if a small-range force sensor is used to improve testing accuracy, it is easy to exceed the range or even damage the sensor when the CEMB caliper is subjected to maximum clamping conditions, increasing testing risks and costs; placing the force sensor directly at the caliper clamping position usually requires changing the existing fixture structure of the test bench or modifying the caliper's installation posture, which is detrimental to the consistency of test conditions; different CEMB caliper models have different installation dimensions and brake disc thicknesses, and traditional fixed clamping fixtures lack versatility, often requiring custom fixture design.

[0030] Therefore, this utility model embodiment provides a testing fixture for CEMB residual clamping force, referring to... Figures 1-2 The test includes a CEMB test specimen 1 and a base plate 8. One end of the base plate 8 has a first support column 3 protruding upwards. The first support column 3 has a first mounting hole. A first bolt is threaded into the first mounting hole to thread the CEMB test specimen 1 onto the first support column 3. The other end of the base plate 8 has a second support column 7 protruding upwards. The second support column 7 has a second mounting hole. A second bolt is threaded into the second mounting hole to thread the push-pull electric cylinder 6 onto the second support column 7. A tension sensor 5 is fixed to the telescopic end of the push-pull electric cylinder 6. A brake disc simulation clamp 4 is fixed to the end of the tension sensor 5 away from the push-pull electric cylinder 6. When the telescopic end of the push-pull electric cylinder 6 extends, it is used to place the brake disc simulation clamp 4 into the opening of the CEMB test specimen 1 and between the two brake pads 2 of the CEMB test specimen 1.

[0031] By mounting the CEMB test specimen 1 and the push-pull electric cylinder 6 at both ends of the base plate 8, and arranging the tension sensor 5 and the brake disc simulation clamp 4 between them, a complete force transmission path is formed. The base plate 8 can be a conventional rigid metal base plate 8 as a reference mounting platform. The first support column 3 is connected to the CEMB test specimen 1 by bolts, and the second support column 7 is connected to the push-pull electric cylinder 6 by bolts. The tension sensor 5 is fixed to the telescopic end of the push-pull electric cylinder 6, and the brake disc simulation clamp 4 is fixed to the other end of the tension sensor 5. This converts the residual clamping force applied by the CEMB caliper to the brake disc into a tension force along the axis of the push-pull electric cylinder 6, which is beneficial for using a small-range tension sensor 5 for measurement.

[0032] In some embodiments, a slide rail is fixed on the base plate 8, and a slider with a limit is slidably connected on the slide rail. The end of the first support column 3 that is not connected to the CEMB test sample 1 is slidably connected to the slider. When the position of the first support column 3 satisfies the requirement that the telescopic end of the push-pull electric cylinder 6 extends to place the brake disc simulation clamp 4 into the opening of the CEMB test sample 1 and between the two brake pads 2 of the CEMB test sample 1, the slider is limited to the slide rail.

[0033] A sliding rail and slider structure is introduced to form a sliding adjustment mechanism for the first support column 3. A linear slide rail is set on the base plate 8 along the direction of the first support column 3 and the second support column 7. The slider with a limiting structure is installed on the slide rail, and the end of the first support column 3 that is not connected to the CEMB test specimen 1 is slidably connected to the slider. When the push-pull electric cylinder 6 extends the brake disc simulation clamp 4 to the caliper opening position, the position of the first support column 3 is maintained by the slider limiting, thereby adapting to different models of calipers and improving the versatility and installation adjustment capability of the tooling.

[0034] In some embodiments, the slide rail is arranged along the line connecting the first support column 3 and the second support column 7, and the slider is provided with scale marks, which are used to indicate the installation position of the first support column 3 relative to the second support column 7.

[0035] The direction of the slide rail and the scale markings on the slider are defined. The slide rail is set along the line connecting the first support column 3 and the second support column 7, and scale markings are set on the slider. When adjusting the position of the first support column 3, the operator can record the position of the specific model of CEMB test specimen 1 through the scale, so as to repeat the test and compare different working conditions, thereby improving the repeatability of installation and adjustment and the traceability of the test process.

[0036] In some embodiments, the test force of the tension sensor 5 is in the range of [0, 200], and the unit of the test force is kN. In actual use, based on the working conditions and the predicted value and conversion relationship of the CEMB residual clamping force, a small-range tension sensor 5 that matches the residual clamping force level can be selected, so that the sensor has good accuracy and resolution within the working range.

[0037] In some embodiments, the tension sensor 5 is arranged along the extension and retraction direction of the push-pull electric cylinder 6, and is a bidirectional tension-compression type tension sensor 5. The first end of the tension sensor 5 is fixed to the extension and retraction end of the push-pull electric cylinder 6 by a threaded connection, and the second end of the tension sensor 5 is fixed to the brake disc simulation clamp 4 by a threaded connection.

[0038] The type and installation method of the tension sensor 5 are limited. A bidirectional tension-compression tension sensor 5 is adopted and arranged along the extension and retraction direction of the push-pull electric cylinder 6. The sensor is fixed to the extension and retraction end of the electric cylinder and the brake disc simulated clamp 4 by using threaded connection. This can ensure that the force direction of the sensor is consistent with the push-pull direction of the electric cylinder, reduce bending and eccentric loads, and improve measurement accuracy and sensor reliability.

[0039] In some embodiments, the brake disc simulation clamp 4 is a plate-shaped structure with a thickness that matches the thickness of the target brake disc adapted to the CEMB test specimen 1. The brake disc simulation clamp 4 is detachably connected to the tension sensor 5 so that different thicknesses of brake disc simulation clamp 4 can be replaced according to different models of CEMB test specimen 1.

[0040] The structure and assembly method of the brake disc simulation clamp 4 are limited. The brake disc simulation clamp 4 is designed as a plate-shaped component that matches the thickness of the target brake disc, and is detachably connected to the tension sensor 5 by bolts or clamping components. When different models of CEMB test specimens 1 are replaced, the brake disc simulation clamp 4 of the corresponding thickness can be replaced simultaneously, so that the stress state at the caliper opening is close to the actual working condition of the brake disc, thereby improving the representativeness and versatility of the test.

[0041] In some embodiments, the bottom of the base plate 8 is provided with several height-adjustable support feet, which are arranged along the four corners of the base plate 8 and are used to adjust the horizontal state of the base plate 8 relative to the ground.

[0042] Adjustable threaded support feet are installed at the four corners of the base plate 8. By adjusting the height of the support feet, the base plate 8 can be leveled, thereby keeping the push-pull electric cylinder 6, the tension sensor 5, and the brake disc simulation clamp 4 in a nearly horizontal state. This helps to reduce lateral disturbances during the test and improve the stability of the data.

[0043] The working principle of a CEMB residual clamping force testing fixture is as follows:

[0044] 1. The push-pull electric cylinder 6, the tension sensor 5, and the brake disc simulation clamp 4 are incompressible rigid connections. Before the CEMB test specimen 1 performs the clamping action, the push-pull electric cylinder 6 extends and places the brake disc simulation clamp 4 at the opening of the CEMB test specimen 1, that is, between the inner and outer brake pads 2 of the CEMB test specimen 1.

[0045] 2. CEMB test sample 1 completes the clamping and releasing action; CEMB is a motor-driven mechanical brake. After receiving the clamping or releasing command, the motor drives the ball screw through the reduction mechanism. Pushing the piston forward will clamp the sample, and pushing the piston backward will release the sample.

[0046] 3. The push-pull electric cylinder 6 retracts at a constant speed, while the tension sensor 5 measures the tension during this process. ;

[0047] 5. According to the formula for calculating friction force. The residual clamping force can be obtained. Since each CEMB test sample 1 has two brake pads 2, one inside and one outside, it needs to be divided by two. The friction coefficient μ can be determined according to the data provided by the manufacturer.

[0048] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A testing fixture for residual clamping force of CEMB, comprising a CEMB test specimen, characterized in that, It also includes a base plate, one end of which protrudes upward with a first support column. The first support column has a first mounting hole, and a first bolt is threaded into the first mounting hole to thread the CEMB test sample onto the first support column. The other end of the base plate protrudes upward with a second support column, and the second support column has a second mounting hole. A second bolt is threaded into the second mounting hole to thread the push-pull electric cylinder onto the second support column. A tension sensor is fixed to the telescopic end of the push-pull electric cylinder, and a brake disc simulation clamp is fixed to the end of the tension sensor away from the push-pull electric cylinder. When the telescopic end of the push-pull electric cylinder extends, it is used to place the brake disc simulation clamp into the opening of the CEMB test sample and between the two brake pads of the CEMB test sample.

2. The testing fixture for CEMB residual clamping force according to claim 1, characterized in that, A slide rail is fixed on the base plate, and a slider with a limit is slidably connected to the slide rail. The end of the first support column that is not connected to the CEMB test sample is slidably connected to the slider. When the position of the first support column satisfies the requirement that the telescopic end of the push-pull electric cylinder extends to place the brake disc simulation clamp into the opening of the CEMB test sample and between the two brake pads of the CEMB test sample, the slider is limited to the slide rail.

3. The testing fixture for CEMB residual clamping force according to claim 2, characterized in that, The slide rail is arranged along the line connecting the first support column and the second support column, and the slider is provided with scale marks, which are used to indicate the installation position of the first support column relative to the second support column.

4. The testing fixture for CEMB residual clamping force according to claim 1, characterized in that, The tensile force sensor measures tensile force in the range of [0, 200], and the unit of tensile force is kN.

5. The testing fixture for CEMB residual clamping force according to claim 4, characterized in that, The tension sensor is arranged along the extension and retraction direction of the push-pull electric cylinder and is a bidirectional tension-compression tension sensor. The first end of the tension sensor is fixed to the extension and retraction end of the push-pull electric cylinder by a threaded connection, and the second end of the tension sensor is fixed to the brake disc simulation clamp by a threaded connection.

6. The testing fixture for CEMB residual clamping force according to claim 1, characterized in that, The brake disc simulation clamp is a plate-shaped structure, and its thickness matches the thickness of the target brake disc that is compatible with the CEMB test sample. The brake disc simulation clamp is detachably connected to the tension sensor so that different thickness brake disc simulation clamps can be replaced according to different models of CEMB test samples.

7. The testing fixture for CEMB residual clamping force according to claim 1, characterized in that, The bottom of the base plate is provided with several height-adjustable support feet, which are arranged along the four corners of the base plate and are used to adjust the horizontal state of the base plate relative to the ground.

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