Automobile shock absorber bearing noise reproduction testing device

Abstract

The utility model discloses an automobile shock absorber bearing noise reproduction testing device, which comprises a fixed plate, a loading plate and a shock absorber movably arranged between the fixed plate and the loading plate, the shock absorber comprises a piston part and a cylinder part, the cylinder part of the shock absorber and the fixed plate are arranged in a relatively inclined manner, and the piston part is arranged on the loading plate. A to-be-tested bearing is detachably connected between the loading plate and the end part of the damper piston part, and the fixed plate is provided with a bearing plate and a driving structure which is used for driving the damper cylinder part to circumferentially rotate along the axis direction of the fixed plate so as to simulate the steering condition of a wheel. The bearing plate is provided with an adjusting structure used for adjusting the offset distance of the shock absorber to simulate the stress point change working condition when the vehicle turns, and one side of the loading plate is provided with a detection structure used for detecting the noise condition generated when the to-be-tested bearing operates. The utility model solves the problems that the traditional automobile shock absorber is lack of a bearing actual operation condition simulation structure and the operation noise of the bearing is tested under the condition of simulating the actual operation condition of the bearing.

Description

Technical Field

[0001] This utility model relates to the technical field of automotive shock absorber bearing noise testing devices, specifically an automotive shock absorber bearing noise reproduction testing device. Background Technology

[0002] As a core component of the automotive steering mechanism, the operating state of automotive shock absorber bearings directly affects the vehicle's handling performance and driving experience. During vehicle start-up, steering, or lateral turning, the force point of the steering mechanism changes, causing uneven loads on the shock absorber bearings. This leads to uneven bearing compression, component friction, and ultimately, noise or abnormal sounds. Currently, the structural design of traditional automotive shock absorbers generally lacks simulation devices for the actual operating conditions of the bearings. Specifically, this manifests in two ways: firstly, it cannot effectively simulate the dynamic adjustment process of the bearing offset caused by changes in the force point during vehicle steering, making it difficult to reproduce the bearing's stress state under different offsets; secondly, it lacks a real-time detection mechanism for bearing operating noise, making it impossible to systematically test the specific parameters of noise generation (such as offset values, swing angles, and load magnitudes) under simulated actual operating conditions. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a test device for reproducing bearing noise in automotive shock absorbers. This device solves the problem of traditional automotive shock absorbers lacking a structure to simulate the actual operating conditions of bearings and to test bearing operating noise under simulated actual operating conditions.

[0004] To achieve the above objectives, this utility model provides a noise reproduction testing device for automotive shock absorber bearings, comprising a fixed plate, a loading plate, and a shock absorber movably disposed between the fixed plate and the loading plate. The shock absorber includes a piston portion and a cylinder portion. The cylinder portion of the shock absorber is inclined relative to the fixed plate. A bearing to be tested is detachably connected between the loading plate and the end of the piston portion of the shock absorber. The fixed plate is provided with a support plate and a drive structure for driving the cylinder portion of the shock absorber to rotate circumferentially along the axis of the fixed plate to simulate wheel steering conditions. The support plate is provided with an adjustment structure for adjusting the offset of the shock absorber to simulate the change in force points during vehicle steering conditions. A detection structure is provided on one side of the loading plate for detecting the noise generated by the bearing to be tested during operation.

[0005] The advantages of adopting the above technical solution are as follows: In the above technology, by setting the fixed plate and the loading plate relative to each other, the shock absorber is installed at an angle and detachably connected to the bearing to be tested. This allows the drive structure to drive the cylinder of the shock absorber to rotate circumferentially to simulate wheel steering. The adjustment structure can change the offset to reproduce the change of the force point, and the detection structure can capture noise in real time. The above design integrates the functions of working condition simulation, offset adjustment and noise detection, which solves the problem that traditional devices lack actual working condition simulation and noise testing. It provides a reproducible test environment for bearing design improvement and can accurately locate the working conditions that generate noise.

[0006] The present invention further includes the following configuration: the driving structure includes a servo motor, the output end of which is connected to the bottom wall of the support plate to drive the cylinder of the shock absorber to rotate synchronously when the support plate rotates.

[0007] The advantages of adopting the above technical solution are: the drive structure in the above technology uses a servo motor connected to the support plate. Through the precise control of the servo motor, the shock absorber cylinder can be driven to swing back and forth at a set frequency and angle to simulate the dynamic working conditions when the wheel is turning. The above driving method can accurately reproduce the speed and angle changes during the turning process, so that the test device can simulate different turning scenarios under controllable conditions, providing a stable and adjustable power source for noise testing, and improving the realism of the working condition simulation and the reliability of the test data.

[0008] The present invention further includes the following features: the adjustment structure includes a support seat disposed on a support plate, the support seat having a swing groove, a swing arm swinging in the swing groove, the swing arm having an "L" shaped radial cross section and being divided into a connecting part and a swinging part, the connecting part being inclined relative to the support plate and being detachably connected to the shock absorber cylinder, and the swinging part swinging in the swing groove and being detachably connected to the swing groove by a pin.

[0009] The advantages of adopting the above technical solution are: the adjustment structure in the above technology can flexibly change the offset of the shock absorber by swinging the "L"-shaped swing arm in the swing groove and detachably connecting it to the shock absorber cylinder. The dynamic adjustment of the offset is achieved through the mechanical structure, which can simulate the real-time change of the force point when the vehicle is turning. In addition, the detachable connection between the swing arm and the pin shaft makes it easy to replace the swing arm of different specifications according to the test requirements, which enhances the adaptability of the device to different vehicle models or working conditions and makes the offset adjustment more in line with the actual steering scenario.

[0010] The present invention further includes: the adjustment structure includes a base plate disposed on the outer wall of the support plate and an adjustment shaft rotatably connected to the base plate. The base plate is disposed perpendicularly to the support plate and the adjustment shaft is disposed parallel to the support plate. The end of the adjustment shaft is threadedly connected to the support seat so that when the adjustment shaft rotates, it drives the support seat to slide along the length direction of the support plate.

[0011] The advantages of adopting the above technical solution are: the addition of a base plate and an adjustment shaft to the adjustment structure, and the threaded connection between the adjustment shaft and the bearing seat, can drive the bearing seat to slide along the bearing plate to achieve quantitative adjustment of the offset. The displacement of the bearing seat along the opening direction of the adjustment shaft is achieved through the threaded transmission structure. This not only makes the operation simple, but also allows for precise control of the offset change by controlling the rotation of the adjustment shaft, avoiding errors from manual adjustment. This makes the change of offset during the test repeatable and traceable, and provides a precise adjustment means for analyzing the relationship between offset and noise.

[0012] The present invention further includes: a plurality of fixing holes evenly distributed on the end face of the bearing plate; wing plates provided on both sides of the bearing seat; and fixing bolts provided on the wing plates for threaded engagement with adjacent fixing holes.

[0013] The advantages of adopting the above technical solution are: the fixing holes on the end face of the bearing plate and the fixing bolts on the wing plate can fix the position of the adjusted bearing seat, preventing displacement of the offset during the test. The evenly distributed fixing holes can meet different offset adjustment requirements. That is, the rigid fixing structure is formed by the cooperation of the wing plate and the fixing bolts, ensuring that the offset remains stable during the swing of the shock absorber, avoiding the distortion of test data due to structural loosening, and ensuring the consistency of working conditions during noise testing.

[0014] The present invention further includes the following features: a fine-tuning groove is provided on the wing plate along the length of the bearing plate, and the fixing bolt is movably disposed in the fine-tuning groove, with the nut end of the fixing bolt abutting against the top wall of the wing plate.

[0015] The advantages of adopting the above technical solution are: the cooperation between the fine-tuning groove on the wing plate and the fixing bolt in the above technology allows for fine adjustment of the offset after the fixed bearing seat is fixed. This design provides fine-tuning space while achieving rigid fixation, and can accurately calibrate for noise mutation points found in the test, so that the offset adjustment is upgraded from coarse adjustment to fine adjustment, which meets the fine testing requirements of noise critical conditions and improves the accuracy of the device in capturing noise sensitive points.

[0016] The present invention further includes the following: the detection structure includes an amplifying speaker, and the amplifying speaker includes a sound measuring line for connecting to the edge of the bearing to be tested or above the end of the piston of the shock absorber.

[0017] The advantages of adopting the above technical solution are: the detection structure in the above technology connects to the bearing edge or the piston part of the shock absorber through the sound measuring line, and uses the amplified sound to amplify the weak noise, so that the tester can clearly perceive the noise change under different offsets or angles. This design converts the invisible noise signal into a perceptible audio signal, avoiding the error of human subjective judgment. Moreover, the flexible connection position of the sound measuring line can locate the noise source for different parts of the bearing, providing an intuitive detection method for analyzing the specific location and mechanism of noise generation.

[0018] The present invention further comprises: the loading plate and the fixed plate are coaxially aligned and parallel to each other; the bearing to be tested is detachably connected to the bottom surface of the loading plate; and the top surface of the loading plate is a force-bearing surface for linkage and cooperation with external hydraulic loading equipment, allowing the loading force output by the external hydraulic loading equipment to directly act on the loading plate.

[0019] The advantages of adopting the above technical solution are: the loading plate and the fixed plate are set coaxially and parallel, and the top surface serves as the force-bearing surface of the hydraulic loading device, which can directly and evenly transfer the external load to the bearing under test, thereby simulating the vertical pressure of the vehicle weight on the bearing. The detachable bearing installation method facilitates the replacement of different models of bearings for comparative testing. The coaxial and parallel structural design ensures the stability of load transfer, making the vertical force borne by the bearing during the test consistent with the actual working conditions, thus improving the engineering practicality and data validity of the testing device. Attached Figure Description

[0020] Figure 1 This is a three-dimensional view of the present invention without the detection structure;

[0021] Figure 2 This is a side view of the present invention. Detailed Implementation

[0022] This utility model provides a noise reproduction test device for an automotive shock absorber 3 bearing, including a fixed plate 1, a loading plate 2, and a shock absorber 3 movably disposed between the fixed plate 1 and the loading plate 2. The shock absorber 3 includes a piston part 31 and a cylinder part 32. The cylinder part 32 of the shock absorber 3 is inclined relative to the fixed plate 1. A bearing 21 to be tested is detachably connected between the loading plate 2 and the end of the piston part 31 of the shock absorber 3. The fixed plate 1 is provided with a support plate 4 and a drive structure for driving the cylinder part 32 of the shock absorber 3 to rotate circumferentially along the axis of the fixed plate 1 to simulate the wheel steering condition. The support plate 4 is provided with an adjustment structure for adjusting the offset of the shock absorber 3 to simulate the force point change condition when the vehicle is steering. The loading plate 3 is also provided with a support plate 4. 2. A detection structure is provided on one side for detecting the noise generated when the bearing 21 under test is running. The driving structure includes a servo motor 12. The output end of the servo motor 12 is connected to the bottom wall of the support plate 4 so as to drive the cylinder part 32 of the shock absorber 3 to rotate synchronously when the support plate 4 rotates. The adjustment structure includes a support seat 41 provided on the support plate 4. The support seat 41 has a swing groove 411. A swing arm 42 is swinging in the swing groove 411. The radial cross section of the swing arm 42 is "L" shaped and divided into a connecting part 421 and a swing part 422. The connecting part 421 is inclined relative to the support plate 4 and is detachably connected to the cylinder part 32 of the shock absorber 3. The swing part... The 422 swing mechanism is detachably connected to the swing groove 411 by a pin 412. The adjustment structure also includes a base plate 43 disposed on the outer wall of the support plate 4 and an adjustment shaft 431 rotatably connected to the base plate 43. The base plate 43 is perpendicular to the support plate 4, and the adjustment shaft 431 is parallel to the support plate 4. The end of the adjustment shaft 431 is threadedly connected to the support seat 41 so that when the adjustment shaft 431 rotates, it drives the support seat 41 to slide along the length of the support plate 4. The end face of the support plate 4 has a plurality of fixing holes 44 evenly distributed. The two side walls of the support seat 41 are provided with wing plates 45, and the wing plates 45 are provided with fixing screws for threaded engagement with adjacent fixing holes 44. Bolt 451, the wing plate 45 has a fine adjustment groove 452 along the length of the bearing plate 4, the fixing bolt 451 is movably disposed in the fine adjustment groove 452, the nut end of the fixing bolt 451 is abutted and fitted with the top wall of the wing plate 45, the detection structure includes an amplifying speaker 5, the amplifying speaker 5 includes a sound measuring line 51 for connecting to the edge of the bearing 21 to be tested or above the end of the piston part 31 of the shock absorber 3, the loading plate 2 is coaxially aligned and parallel to the fixing plate 1, the bearing 21 to be tested is detachably connected to the bottom surface of the loading plate 2, the top surface of the loading plate 2 is a force-bearing surface 22 for linkage with external hydraulic loading equipment and for the loading force output by the external hydraulic loading equipment to directly act on the loading plate 2.

[0023] Overall operation flow of the automotive shock absorber bearing noise reproduction testing device:

[0024] 1. Install the shock absorber (including piston and cylinder) to be tested at an angle between the fixed plate and the loading plate. The cylinder of the shock absorber is connected to the load plate through the adjustment structure of the swing arm (the connecting part of the swing arm and the cylinder can be detachably fixed). The end of the piston is connected to the loading plate through bolts. The bearing to be tested is installed between the loading plate and the piston. Connect the sound test wire to the edge of the bearing to be tested or above the piston of the shock absorber, and connect the other end to the amplifier to complete the noise detection link.

[0025] 2. By rotating the adjusting shaft (threaded to the bearing seat), the bearing seat is driven to slide along the length of the bearing plate, changing the position of the swing arm in the swing groove, so that the offset between the hinge point (force point) and the rotating shaft is adjusted to the initial value of simulating the straight-moving state of the vehicle.

[0026] 3. Use the fixing holes on the end face of the bearing seat and the fixing bolts on the wing plate to lock the adjusted bearing seat position to prevent offset displacement during testing; if fine adjustment is required, the fixing bolts can be moved through the fine adjustment groove of the wing plate to achieve fine offset adjustment.

[0027] 4. The external hydraulic loading device applies a vertical force to the piston of the shock absorber through the top surface of the loading plate, simulating the load of the vehicle weight on the bearing.

[0028] 5. Start the servo motor and drive the support plate and shock absorber cylinder to swing back and forth in a ±45° circumferential direction at a frequency of 0.1Hz to simulate the swinging condition when the wheel is turning.

[0029] 6. Amplify the bearing operating noise collected by the sound measuring line in real time. The tester observes the noise situation at different swing angles (such as 0°, ±15°, ±30°, ±45°) by the change in audio. The offset value, swing angle and load size when the noise first appears or the noise changes suddenly are recorded. At the same time, observe whether there is abnormal displacement in the bearing gap.

[0030] 7. Remove the vertical load, and adjust the adjusting shaft each time to increase the offset by 2mm (or set the step size according to the requirements). Repeat the above steps and test the noise under different offsets in turn. By changing the combination of offset and swing angle, reproduce different working conditions such as vehicle starting and turning, and side turning, and establish an offset-noise correspondence database.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A test device for reproducing noise in automotive shock absorber bearings, characterized in that: The device includes a fixed plate, a loading plate, and a shock absorber movably disposed between the fixed plate and the loading plate. The shock absorber includes a piston section and a cylinder section. The cylinder section of the shock absorber is inclined relative to the fixed plate. A bearing to be tested is detachably connected between the loading plate and the end of the piston section of the shock absorber. The fixed plate is provided with a support plate and a drive structure for driving the cylinder section of the shock absorber to rotate circumferentially along the axis of the fixed plate to simulate wheel steering conditions. The support plate is provided with an adjustment structure for adjusting the offset of the shock absorber to simulate the change of force points during vehicle steering conditions. A detection structure is provided on one side of the loading plate for detecting the noise generated when the bearing to be tested is in operation.

2. The automotive shock absorber bearing noise reproduction testing device according to claim 1, characterized in that: The drive structure includes a servo motor, the output end of which is connected to the bottom wall of the support plate to drive the cylinder of the shock absorber to rotate synchronously when the support plate rotates.

3. The automotive shock absorber bearing noise reproduction testing device according to claim 1, characterized in that: The adjustment structure includes a support seat mounted on a support plate, a swing groove on the support seat, a swing arm swinging in the swing groove, the swing arm having an "L" shaped radial cross section and being divided into a connecting part and a swinging part, the connecting part being inclined relative to the support plate and being detachably connected to the shock absorber cylinder, and the swinging part swinging in the swing groove and being detachably connected to the swing groove by a pin.

4. The automotive shock absorber bearing noise reproduction testing device according to claim 3, characterized in that: The adjustment structure also includes a base plate disposed on the outer wall of the support plate and an adjustment shaft rotatably connected to the base plate. The base plate is disposed perpendicular to the support plate and the adjustment shaft is disposed parallel to the support plate. The end of the adjustment shaft is threadedly connected to the support seat so as to drive the support seat to slide along the length direction of the support plate when the adjustment shaft rotates.

5. The automotive shock absorber bearing noise reproduction testing device according to claim 3, characterized in that: The bearing plate has several fixing holes evenly distributed on its end face, and the bearing seat has wing plates on both sides of its side wall. The wing plates are provided with fixing bolts for threaded engagement with the adjacent fixing holes.

6. The automotive shock absorber bearing noise reproduction testing device according to claim 5, characterized in that: The wing plate has a fine-tuning groove along the length of the bearing plate, and the fixing bolt is movably disposed in the fine-tuning groove. The nut end of the fixing bolt is engaged with the top wall of the wing plate.

7. The automotive shock absorber bearing noise reproduction testing device according to claim 1, characterized in that: The detection structure includes an amplifying speaker, which includes a sound-measuring wire for connecting to the edge of the bearing to be tested or above the end of the piston portion of the shock absorber.

8. The automotive shock absorber bearing noise reproduction testing device according to claim 1, characterized in that: The loading plate and the fixed plate are coaxially aligned and parallel to each other. The bearing to be tested is detachably connected to the bottom surface of the loading plate. The top surface of the loading plate is a force-bearing surface for linkage with external hydraulic loading equipment and for the loading force output by the external hydraulic loading equipment to act directly on the loading plate.

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