Automobile suspension bearing friction torque detection device

Abstract

The utility model relates to the technical field of automobile suspension systems, in particular to an automobile suspension bearing friction torque detection device, which comprises a machine body, a servo motor, a speed reducer, a rotating shaft, a screw rod, a handle, a loading spring, an axial pressure sensor, a placing device and a measuring device. Radial and axial loads are borne through the suspension bearing, external interference is greatly reduced, and particularly, the influence of the friction torque of the measuring device on the friction torque detection of the suspension bearing is eliminated, so that the final detection value is real and reliable, the detection condition is close to the actual working condition, the detection value is real and reliable, and the practicability is high; the friction performance of the suspension bearing can be well evaluated, and an effective suspension bearing quality control means is provided for suspension bearing manufacturers; the design of simultaneous detection of the two sets of suspension bearings can eliminate the influence of the rotating shaft on the friction torque detection, and guarantees the detection precision of the friction torque.

Description

Technical Field

[0001] This utility model relates to the field of automotive suspension system technology, specifically to an automotive suspension bearing friction torque detection device. Background Technology

[0002] With the rapid development of the automotive industry and the increasing demands of consumers for vehicle quality, the dynamic performance and reliability of suspension bearings, as crucial components of automotive suspension systems, are receiving increasing attention. Suspension bearing friction torque is an important parameter, as it constitutes resistance to the rotation of the suspension bearing; therefore, its testing is becoming increasingly important in various suspension bearing-related tests.

[0003] Existing testing methods may suffer from insufficient accuracy in measuring friction torque due to the inability to effectively eliminate interference from the rotating shaft. Furthermore, they lack sufficient simulation of actual vehicle driving conditions (such as comprehensive load simulation), resulting in unreliable and unrealistic test results that cannot accurately assess the dynamic friction performance and quality of suspension bearings. Therefore, we propose a friction torque testing device for automotive suspension bearings. Utility Model Content

[0004] The purpose of this invention is to solve the problem of insufficient accuracy in measuring friction torque, and to provide a device for detecting the friction torque of automotive suspension bearings.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A device for detecting the friction torque of an automotive suspension bearing includes a body. The device comprises a servo motor, a reducer, a rotating shaft, a lead screw, a handle, a loading spring, an axial pressure sensor, a placement device, and a measuring device. The servo motor is located at the bottom of the body. The reducer is fixedly installed at the output end of the servo motor. The rotating shaft is located at the drive end of the reducer. The lead screw is threaded to the inner wall of the top end of the rotating shaft. The handle is fixedly installed at the top of the lead screw. The loading spring is installed at the bottom end of the lead screw. The axial pressure sensor is installed at the bottom of the loading spring. The placement device is located between the inner wall of the bottom surface of the rotating shaft and the detection end of the axial pressure sensor. The measuring device is installed on the outside of the placement device.

[0007] Preferably, the placement device includes a first suspension bearing seat, a second suspension bearing seat, a second suspension bearing inner ring spacer, a lever arm, a first suspension bearing, and a second suspension bearing. The first suspension bearing seat is fixedly installed on the inner wall of the bottom surface of the rotating shaft, the second suspension bearing seat is fixedly installed on the detection end of the axial pressure sensor, the second suspension bearing inner ring spacer is disposed between the first suspension bearing seat and the second suspension bearing seat, the outer ring of the first suspension bearing is installed on the second suspension bearing seat, and the outer ring of the second suspension bearing is installed on the second suspension bearing seat.

[0008] Preferably, the measuring device includes a slot block, a friction torque sensor, a slider, an up-down adjusting slide rail, and a left-right adjusting slide rail. The slot block is engaged with the end of the lever arm away from the inner ring spacer of the suspension bearing. The detection end of the friction torque sensor is installed on the outer wall of the slot block. The slider is fixed to the outer wall of the friction torque sensor. The left-right adjusting slide rail is fixedly installed on the top of the machine body. The up-down adjusting slide rail is slidably installed on the outer wall of the left-right adjusting slide rail, and the slider is slidably installed on the outer wall of the up-down adjusting slide rail.

[0009] Preferably, the inner ring of the second suspension bearing and the inner ring of the first suspension bearing are mounted opposite each other on the inner ring spacer of the suspension bearing, and a force arm is mounted on the inner ring spacer of the suspension bearing.

[0010] Preferably, the axial pressure sensor and the friction torque sensor convert the friction force into electronic signals and transmit them to a computer via an externally configured electronic signal processor.

[0011] By employing the above technical solution, this utility model provides a device for detecting the friction torque of automotive suspension bearings. Its beneficial effects are: This utility model significantly reduces external interference by having the suspension bearing bear radial and axial loads, particularly eliminating the influence of the measuring device's own friction torque on the detection of suspension bearing friction torque. Therefore, the final detection value is accurate and reliable, the detection conditions are close to actual working conditions, and the detection values ​​are accurate and reliable, making it highly practical. It can effectively evaluate the friction performance of suspension bearings and provides suspension bearing manufacturers with an effective means of quality control for suspension bearings. The design of simultaneously detecting two sets of suspension bearings can eliminate the influence of the rotating shaft on the friction torque detection, ensuring the accuracy of the friction torque detection. Attached Figure Description

[0012] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application:

[0013] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0014] Figure 2 This is an enlarged schematic diagram of point A in this utility model;

[0015] Figure 3 This is a top view of the measuring device in Embodiment 1.

[0016] In the diagram: 1. Servo motor; 11. Reducer; 2. Rotary shaft; 3. Lead screw; 4. Handle; 5. Loading spring; 6. Axial pressure sensor; 7. Placement device; 71. Suspension bearing seat one; 72. Suspension bearing seat two; 73. Suspension bearing inner ring spacer; 74. Lever arm; 75. Suspension bearing one; 76. Suspension bearing two; 8. Measuring device; 81. Slot block; 82. Friction torque sensor; 83. Slider; 84. Up-down adjustment slide rail; 85. Left-right adjustment slide rail. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0018] A device for detecting the friction torque of automotive suspension bearings, such as Figures 1-3 As shown, the automotive suspension bearing friction torque measuring device includes a body, a servo motor 1, a reducer 11, a rotating shaft 2, a lead screw 3, a handle 4, a loading spring 5, an axial pressure sensor 6, a placement device 7, and a measuring device 8. The servo motor 1 is located at the bottom of the body. The reducer 11 is fixedly installed at the output end of the servo motor 1. The rotating shaft 2 is located at the drive end of the reducer 11. The lead screw 3 is threadedly connected to the inner wall of the top of the rotating shaft 2. The handle 4 is fixedly installed at the top of the lead screw 3. The loading spring 5 is installed at the bottom end of the lead screw 3. The axial pressure sensor 6 is installed at the bottom of the loading spring 5. The placement device 7 is located between the inner wall of the bottom surface of the rotating shaft 2 and the detection end of the axial pressure sensor 6. The measuring device 8 is installed on the outside of the placement device 7.

[0019] The placement device 7 includes a first suspension bearing seat 71, a second suspension bearing seat 72, a second suspension bearing inner ring spacer 73, a lever arm 74, a first suspension bearing 75, and a second suspension bearing 76. The first suspension bearing seat 71 is fixedly installed on the inner wall of the bottom surface of the rotating shaft 2. The second suspension bearing seat 72 is fixedly installed on the detection end of the axial pressure sensor 6. The second suspension bearing inner ring spacer 73 is disposed between the first suspension bearing seat 71 and the second suspension bearing seat 72. The outer ring of the first suspension bearing 75 is installed on the second suspension bearing seat 72. The outer ring of the second suspension bearing 76 is installed on the second suspension bearing seat 72.

[0020] The measuring device 8 includes a slot block 81, a friction torque sensor 82, a slider 83, an up-down adjusting slide rail 84, and a left-right adjusting slide rail 85. The slot block 81 is engaged with the end of the lever arm 74 away from the inner ring spacer 73 of the suspension bearing. The detection end of the friction torque sensor 82 is installed on the outer wall of the slot block 81. The slider 83 is fixed to the outer wall of the friction torque sensor 82. The left-right adjusting slide rail 85 is fixedly installed on the top of the machine body. The up-down adjusting slide rail 84 is slidably installed on the outer wall of the left-right adjusting slide rail 85, and the slider 83 is slidably installed on the outer wall of the up-down adjusting slide rail 84.

[0021] The inner rings of suspension bearing 2 76 and suspension bearing 1 75 are mounted opposite each other on the inner ring spacer 73 of the suspension bearing, and a lever 74 is mounted on the inner ring spacer 73 of the suspension bearing.

[0022] The axial pressure sensor 6 and the friction torque sensor 82 convert friction force into electronic signals and transmit them to the computer via an externally configured electronic signal processor.

[0023] In use, the automotive suspension bearing friction torque detection device of this utility model involves placing suspension bearing 75 and suspension bearing 76 into the inner rings of suspension bearing housing 71 and suspension bearing housing 72, respectively. Rotating handle 4 causes lead screw 3 to rotate downwards on the inner wall of the top of rotating shaft 2. Lead screw 3 compresses loading spring 5, applying axial and radial loads to axial pressure sensor 6. The lever arm 74 on the inner ring spacer 73 of the suspension bearing is inserted into the slot 81 of the measuring device 8. During the oscillation process, the two sets of suspension bearings, subjected to friction torque, generate an alternating positive and negative oscillation force on the inner ring spacer 73 (the alternating positive and negative oscillation force is the added force). The change in the force applied by the load spring 5 causes the suspension bearing to swing up and down, which is transmitted to the retaining block 81 through the lever arm 74. The position needs to be adjusted using the up-and-down adjusting slide rail 84. The rotating shaft 2 drives the outer ring of the suspension bearing to rotate, and due to friction, this drives the inner ring to rotate, causing the lever arm 74 to swing left and right. The position needs to be adjusted using the left-and-right adjusting slide rail 85. The suspension bearing is installed in an inclined fixture to ensure that the axial load direction maintains an angle with the suspension bearing axis (the suspension bearing is subjected to combined radial and axial loads), thus simulating the pressure exerted on the vehicle suspension system during driving, making the testing conditions close to actual conditions.

[0024] During testing, an axial force is applied to clamp the two sets of suspension bearings. Under the drive system [(composed of a servo motor 1 and a reducer 11, capable of driving the suspension bearings to swing between positive and negative regression angles to simulate the free rotation of the suspension bearings when the vehicle is turning)], the outer rings of the two sets of suspension bearings rotate synchronously. Under the action of friction, the inner ring spacers 73 of the two sets of suspension bearings will rotate, driving the lever arm 74 to rotate. The lever arm 74 directly transmits the friction force of the two sets of suspension bearings to the friction torque sensor 82. The friction force is converted into an electronic signal by the electronic signal processor and transmitted to the computer. Combining the effective length of the lever arm 74 and according to the definition of friction torque, the measurement software automatically analyzes and calculates, and generates a dynamic friction torque change curve, which can calculate the real-time friction torque of the two sets of suspension bearings.

[0025] The technical parameters of the suspension bearing friction torque measuring device required for the measurement software calculation are as follows:

[0026] 1. Axial load: 0.2~3, 2~8 kN, accuracy ±1%;

[0027] 2. Test deflection angle: -45°~+45°, accuracy 0.1°;

[0028] 3. Test rotation speed: 0.5~10 r / min, accuracy ±1%;

[0029] 4. Friction torque range: 0~15 N·m, accuracy ±1%.

[0030] The required conditions and conclusions for detecting the friction torque of the suspension bearing for the friction torque sensor 82 are as follows:

[0031] Test conditions: Axial load of 6053N, rotation frequency of 0.1 Hz, rotation angle of -20° to 20°, and ambient temperature of room temperature.

[0032] Test conclusion: The obtained rotational friction torque curve shows that the friction torque of the suspension bearing is positive when rotating clockwise and negative when rotating counterclockwise.

[0033] Initiating friction torque detection:

[0034] Test conditions: axial load of 6053N, rotation frequency of 0.05 Hz, recording time of 0.5s, and ambient temperature of room temperature.

[0035] Test results: The starting friction torque curve was obtained. After the suspension bearing starts, the friction torque quickly reaches its peak value and then drops rapidly. After a period of oscillation, the change in friction torque tends to level off.

[0036] By using the suspension bearings to bear radial and axial loads, external interference is significantly reduced, especially the influence of the frictional torque of the measuring device 8 itself on the frictional torque detection of the suspension bearings. Therefore, the final detection value is true and reliable, the detection conditions are close to the actual working conditions, the detection value is true and reliable, and it is highly practical. It can well evaluate the frictional performance of the suspension bearings and provide a practical and effective means of quality control for suspension bearing manufacturers. The design of setting up two sets of suspension bearings for simultaneous detection can eliminate the influence of the rotating shaft 2 on the frictional torque detection, ensuring the accuracy of the frictional torque detection.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the friction torque of automotive suspension bearings, comprising a body, characterized in that: The automotive suspension bearing friction torque detection device includes a servo motor (1), a reducer (11), a rotating shaft (2), a lead screw (3), a handle (4), a loading spring (5), an axial pressure sensor (6), a placement device (7), and a measuring device (8). The servo motor (1) is located at the bottom of the machine body. The reducer (11) is fixedly installed at the output end of the servo motor (1). The rotating shaft (2) is located at the drive end of the reducer (11). The lead screw (3) is threaded to the inner wall of the top end of the rotating shaft (2). The handle (4) is fixedly installed at the top of the lead screw (3). The loading spring (5) is installed at the bottom end of the lead screw (3). The axial pressure sensor (6) is installed at the bottom of the loading spring (5). The placement device (7) is located between the inner wall of the bottom surface of the rotating shaft (2) and the detection end of the axial pressure sensor (6). The measuring device (8) is installed on the outside of the placement device (7).

2. The automobile suspension bearing friction torque detection device according to claim 1, characterized in that: The placement device (7) includes a first suspension bearing seat (71), a second suspension bearing seat (72), a second suspension bearing inner ring spacer (73), a lever arm (74), a first suspension bearing (75), and a second suspension bearing (76). The first suspension bearing seat (71) is fixedly installed on the inner wall of the bottom surface of the rotating shaft (2). The second suspension bearing seat (72) is fixedly installed on the detection end of the axial pressure sensor (6). The second suspension bearing inner ring spacer (73) is disposed between the first suspension bearing seat (71) and the second suspension bearing seat (72). The outer ring of the first suspension bearing (75) is installed on the second suspension bearing seat (72). The outer ring of the second suspension bearing (76) is installed on the second suspension bearing seat (72).

3. The automobile suspension bearing friction torque detection device according to claim 1, characterized in that: The measuring device (8) includes a slot block (81), a friction torque sensor (82), a slider (83), an up-down adjustment slide rail (84), and a left-right adjustment slide rail (85). The slot block (81) is engaged with the end of the lever arm (74) away from the inner ring spacer (73) of the suspension bearing. The detection end of the friction torque sensor (82) is installed on the outer wall of the slot block (81). The slider (83) fixes the outer wall of the friction torque sensor (82). The left-right adjustment slide rail (85) is fixedly installed on the top of the machine body. The up-down adjustment slide rail (84) is slidably installed on the outer wall of the left-right adjustment slide rail (85), and the slider (83) is slidably installed on the outer wall of the up-down adjustment slide rail (84).

4. The automobile suspension bearing friction torque detection device according to claim 2, characterized in that: The inner ring of the second suspension bearing (76) and the inner ring of the first suspension bearing (75) are mounted opposite each other on the inner ring spacer (73) of the suspension bearing, and the inner ring spacer (73) of the suspension bearing is equipped with a lever (74).

5. The automotive suspension bearing friction torque detection device according to claim 1, characterized in that: The axial pressure sensor (6) and friction torque sensor (82) convert friction force into electronic signals and transmit them to a computer via an externally configured electronic signal processor.

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