High speed noise test independent centering lateral force application device

Abstract

This utility model discloses an independent centering lateral force-applying device for high-speed noise testing, belonging to the field of vibration damper performance testing. It includes a base and a support arm mounted on the base. A guide seat is slidably connected to the outer surface of the support arm, and a lifting wheel is rotatably connected to the inner wall of the guide seat. The lifting wheel is in contact with the outer wall of the support arm. Through a height adjustment structure of "lifting wheel + locking assembly," the elastic rubber sleeve on the lifting wheel is tightly fitted to the outer wall of the support arm. Combined with the tight pressing of the anti-slip rubber pad on the fastening plate of the locking assembly with the support arm, and the fit between the elastic rubber ring on the through groove and the locking bolt, the gaps in the height adjustment mechanism can be minimized. Simultaneously, the V-shaped clamping cavity of the clamping opening and closing block, with its elastic rubber pad, ensures secure clamping of the vibration damper cylinder without loosening, preventing collision noise caused by gaps in the clamping area. This design eliminates additional noise caused by gaps in the device's components at the source.

Description

Technical Field

[0001] This utility model belongs to the field of vibration damper performance testing technology, specifically relating to an independent centering lateral force application device for high-speed noise testing. Background Technology

[0002] In the research and development of automotive chassis systems and the quality control of components, the high-speed noise performance of shock absorbers is one of the core indicators for measuring ride comfort and product quality. When driving at high speeds, shock absorbers need to withstand complex lateral loads from the road surface. The relative movement of the cylinder and piston rod and the internal oil flow state will change with the lateral force, thereby generating noise of different frequencies. If the noise exceeds the standard range, it will directly affect the user's driving experience. Therefore, simulating high-speed conditions in a laboratory environment, accurately applying lateral force to the shock absorber and collecting noise data has become a key link in the research and development and factory testing of shock absorbers.

[0003] Some existing lateral force-applying devices require a reserved basic assembly space for the fit between the guide seat and the support arm (otherwise, the guide seat cannot be slidably adjusted). Even when the bolts are tightened, a small gap (usually 0.1mm-0.3mm) will still form. It is impossible to achieve full contact surface fit between the guide seat and the support arm, and gaps still exist in the unpressed areas. In high-speed noise testing, the vibration damper reciprocates at high frequency with the actuator of the test bench, and the vibration will be transmitted to the fit between the guide seat and the support arm. The originally small static gap will be amplified under dynamic impact, causing the guide seat and the support arm to produce "micro-movement", which in turn causes abnormal metal collision noise. Therefore, an independent centering lateral force-applying device for high-speed noise testing is proposed. Utility Model Content

[0004] The purpose of this invention is to provide an independent centering lateral force application device for high-speed noise testing, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-speed noise testing independent centering lateral force application device, including a base and a support arm set on the base. A guide seat is slidably connected to the outer surface of the support arm, and a lifting wheel is rotatably connected to the inner wall of the guide seat. The lifting wheel is in contact with the outer wall of the support arm, and an elastic rubber sleeve is provided on the outer surface of the lifting wheel. A locking component is provided on the guide seat.

[0006] A threaded centering seat is fixedly installed on one side of the guide seat. A thrust sleeve is threadedly connected to the outer surface of the threaded centering seat. A centering shaft is rotatably connected to one side of the thrust sleeve. A tension / compression sensor is fixedly installed at the end of the centering shaft away from the thrust sleeve. A clamping opening / closing block is provided at the end of the tension / compression sensor away from the centering shaft.

[0007] Through the above technical solution, the height adjustment structure of "lifting wheel + locking component" ensures that the elastic rubber sleeve on the lifting wheel fits tightly against the outer wall of the support arm, and the locking component can minimize the gap in the height adjustment mechanism.

[0008] In a preferred embodiment, the base has a slot inside that is adapted to the support arm, and the base and the support arm are connected by a first bolt.

[0009] The above technical solution facilitates the stable installation of the support arm on the base, while the first bolt enables the disassembly and replacement of the support arm, improving the ease of assembly and disassembly and the versatility of the device.

[0010] In a preferred embodiment, the locking assembly includes a spring and a locking bolt. One end of the spring is fixedly connected to the inner wall of the guide seat, and the other end of the spring is fixedly connected to a fastening plate. An anti-slip rubber pad is fixedly installed on the side of the fastening plate near the guide seat. The guide seat has a through groove adapted to the locking bolt. An elastic rubber ring is fixedly installed on the inner wall of the through groove in the guide seat. The fastening plate has a threaded groove adapted to the locking bolt. The locking bolt can pass through the through groove into the inside of the spring and be threadedly connected to the threaded groove in the fastening plate.

[0011] With the above technical solution, when adjusting the height of the guide seat, press the fastening plate and rotate the locking bolt in the opposite direction to separate the locking bolt from the fastening plate. The spring returns to its original position, causing the fastening plate to disengage from the support arm. At this time, the guide seat can slide smoothly. After adjustment, press the fastening plate and rotate the locking bolt in the forward direction to fix the fastening plate and the locking bolt in a threaded connection. During the rotation, the fastening plate can compress the spring and fit tightly against the support arm to achieve a firm fixation of the guide seat. The operation is convenient and the fixation is reliable.

[0012] In a preferred embodiment, the clamping opening and closing block includes a first opening and closing block and a second opening and closing block disposed on one side of the first opening and closing block. One side of the first opening and closing block is fixedly connected to a tension and compression sensor, and the first opening and closing block and the second opening and closing block are connected by a second bolt.

[0013] With the above technical solution, when installing the shock absorber cylinder, the clamping block can be opened by loosening the second bolt, and the cylinder can be placed in and the second bolt tightened to make the first and second opening blocks fit tightly together, thus realizing the quick clamping and disassembly of the cylinder.

[0014] In a preferred embodiment, both the first and second opening blocks have V-shaped clamping cavities inside, and elastic rubber pads are fixedly installed on the inner walls of the V-shaped clamping cavities inside the first and second opening blocks.

[0015] Through the above technical solution, the V-shaped clamping cavity can be compatible with various diameters of damper cylinders, eliminating the need to design separate clamps for different models of dampers, reducing testing costs. The elastic rubber pad not only protects the cylinder but also improves clamping stability, preventing the application accuracy of lateral force from being affected by cylinder loosening. At the same time, it reduces vibration noise at the clamping point, ensuring the accuracy of noise test data.

[0016] In a preferred embodiment, the thrust sleeve is internally threaded with a positioning bolt, which can contact the threaded centering seat.

[0017] With the above technical solution, after the thrust sleeve is adjusted to the target position and the lateral force meets the test requirements, tighten the positioning bolt so that its end is pressed against the threaded centering seat. This can fix the thrust sleeve and the threaded centering seat relatively, preventing the thrust sleeve from rotating on its own due to vibration during the test, thereby avoiding fluctuations in the lateral force value, ensuring the stability of the lateral force during the test, ensuring consistent test conditions, and improving the reliability of the test results.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This high-speed noise testing independent centering lateral force application device uses a height adjustment structure of "lifting wheel + locking assembly". The elastic rubber sleeve on the lifting wheel fits tightly against the outer wall of the support arm. Combined with the tight pressing of the anti-slip rubber pad on the fastening plate of the locking assembly against the support arm, and the fit of the elastic rubber ring on the through groove against the locking bolt, the gap of the height adjustment mechanism can be eliminated to the greatest extent. At the same time, the V-shaped clamping cavity of the clamping opening and closing block, with elastic rubber pad, can achieve a non-loose clamping of the shock absorber cylinder, avoiding collision noise caused by gaps in the clamping part. The above design eliminates the additional noise caused by the gaps in the device's own components from the root, so that the collected noise data can truly reflect the acoustic performance of the shock absorber under high-speed conditions, providing accurate data support for the acoustic optimization of the shock absorber.

[0020] 2. This high-speed noise test independent centering lateral force application device forms the first layer of locking through the threaded engagement between the threaded centering seat and the thrust sleeve. Then, with the help of the positioning bolts added to the thrust sleeve, a double locking structure is formed. After adjusting the lateral force through the threaded engagement, tightening the positioning bolts so that their ends press against the threaded centering seat can completely lock the relative position of the thrust sleeve and the threaded centering seat. This effectively resists the influence of high-frequency vibration on the threaded engagement part during high-speed testing and avoids fluctuations in lateral force value caused by loosening of the thrust sleeve.

[0021] 3. This high-speed noise test independent centering lateral force application device, through the high-precision strain gauge tension and compression sensor on the device, can collect dynamic change data of lateral force in real time and transmit it synchronously to an external display terminal via a data cable. The staff can intuitively monitor the force value change during the test and adjust it in time when the force value exceeds the set range to avoid invalid test due to abnormal force value.

[0022] 4. This high-speed noise testing independent centering lateral force application device has broad applicability through the V-shaped clamping cavity of the clamping block. It can stably clamp mainstream shock absorber cylinders with diameters ranging from 30mm to 60mm (covering most shock absorber specifications for passenger cars, light commercial vehicles, etc.). There is no need to design and replace special fixtures for cylinders of different diameters. This not only saves the design, processing and storage costs of fixtures, but also avoids the tedious operation of frequently changing fixtures. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the connection test between the device of this utility model and the test bench;

[0024] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0026] Figure 4 This is a top view sectional structural diagram of the present invention;

[0027] Figure 5 This is a schematic diagram of the guide seat structure of this utility model.

[0028] In the diagram: 1. Base; 2. Support arm; 3. Guide seat; 4. Lifting wheel; 5. Threaded centering seat; 6. Thrust sleeve; 7. Centering shaft; 8. Tension / compression sensor; 9. Clamping opening / closing block; 91. First opening / closing block; 92. Second opening / closing block; 93. Second bolt; 10. First bolt; 11. Spring; 12. Locking bolt; 13. Fastening plate; 14. Elastic rubber pad; 15. Positioning bolt. Detailed Implementation

[0029] The present invention will be further described below with reference to the embodiments.

[0030] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0031] Please see Figure 1-5This utility model provides an independent centering lateral force application device for high-speed noise testing, including a base 1 and a support arm 2 set on the base 1. The base 1 has a slot adapted to the support arm 2. The base 1 and the support arm 2 are connected by a first bolt 10. The slot facilitates the stable installation of the support arm 2 on the base 1. At the same time, the support arm 2 can be disassembled and replaced by the first bolt 10, improving the ease of disassembly and assembly and the versatility of the device.

[0032] Furthermore, a guide seat 3 is slidably connected to the outer surface of the support arm 2. The guide seat 3 has a frame structure, and a lifting wheel 4 is rotatably connected to the inner wall of the guide seat 3. The wheel surface of the lifting wheel 4 is in close contact with the outer wall of the support arm 2, and an elastic rubber sleeve is provided on the outer surface of the lifting wheel 4 to ensure smooth lifting of the guide seat 3 while avoiding noise caused by gaps. A locking assembly is provided on the guide seat 3 to fix it after the guide seat 3 is adjusted to the target height. There are two sets of locking assemblies, symmetrically arranged on the guide seat 3.

[0033] Furthermore, the locking assembly includes a spring 11 and a locking bolt 12. One end of the spring 11 is fixedly connected to the inner wall of the guide seat 3. The spring 11 has a certain pre-compression amount, which can drive the fastening plate 13 to reset when the locking bolt 12 is loosened. The other end of the spring 11 is fixedly connected to the fastening plate 13. An anti-slip rubber pad is fixedly installed on the side of the fastening plate 13 near the guide seat 3, which can enhance the friction with the support arm 2 and improve the fixing effect. The guide seat 3 has a through groove adapted to the locking bolt 12. An elastic rubber ring is fixedly installed on the inner wall of the through groove. The locking bolt 12 can move and rotate along the through groove. The fastening plate 13 has a threaded groove adapted to the locking bolt 12. The locking bolt 12 can pass through the through groove and be threadedly connected to the threaded groove in the fastening plate 13. When adjusting the height of the guide seat 3, press the fastening plate 13 and rotate the locking bolt 12 in the opposite direction to separate the locking bolt 12 from the fastening plate 13. The spring 11 returns to its original position and drives the fastening plate 13 to disengage from the support arm 2. At this time, the guide seat 3 can slide smoothly. After adjustment, press the fastening plate 13 and rotate the locking bolt 12 in the forward direction to fix the fastening plate 13 and the locking bolt 12 in a threaded connection. During the rotation, the fastening plate 13 can compress the spring 11 and fit tightly against the support arm 2 to achieve a firm fixation of the guide seat 3. The operation is convenient and the fixation is reliable.

[0034] Furthermore, a threaded centering seat 5 is fixedly installed on one side of the guide seat 3. The threaded centering seat 5 is a cylindrical component with external threads, and its axis is collinear with the clamping center of the shock absorber cylinder to ensure the coaxiality of the applied lateral force. A thrust sleeve 6 is threadedly connected to the outer surface of the threaded centering seat 5. A centering shaft 7 is rotatably connected to one side of the thrust sleeve 6 through a bearing. The centering shaft 7 can move axially with the rotation of the thrust sleeve 6 to ensure the stability of the applied force direction. A tension / compression sensor 8 is fixedly installed at the end of the centering shaft 7 away from the thrust sleeve 6. The tension / compression sensor 8 is a high-precision strain gauge sensor that can collect lateral thrust or tension data in real time and transmit it to an external display device through a data cable, so that the staff can monitor the force value in real time. A clamping opening and closing block 9 is provided at the end of the tension / compression sensor 8 away from the centering shaft 7 to stabilize the clamping of the shock absorber cylinder and prevent the cylinder from shifting during the test. The thrust sleeve 6 has an internal threaded connection with a positioning bolt 15, which can contact the threaded centering seat 5. When the thrust sleeve 6 is adjusted to the target position and the lateral force meets the test requirements, tighten the positioning bolt 15 so that its end is pressed against the threaded centering seat 5. This can fix the thrust sleeve 6 and the threaded centering seat 5 relatively, preventing the thrust sleeve 6 from rotating on its own due to vibration during the test, thereby avoiding fluctuations in the lateral force value, ensuring the stability of the lateral force during the test, ensuring consistent test conditions, and improving the reliability of the test results.

[0035] Furthermore, the clamping opening and closing block 9 includes a first opening and closing block 91 and a second opening and closing block 92 disposed on one side of the first opening and closing block 91. The first opening and closing block 91 and the second opening and closing block 92 are symmetrical in structure and form a complete clamping cavity after being spliced ​​together. One side of the first opening and closing block 91 is fixedly connected to the tension and compression sensor 8. The first opening and closing block 91 and the second opening and closing block 92 are connected by a second bolt 93. There are two second bolts 93 symmetrically distributed at both ends of the opening and closing block to ensure uniform clamping force. When installing the shock absorber cylinder, the clamping opening and closing block 9 can be opened by loosening the second bolt 93. After the cylinder is placed in, the second bolt 93 is tightened to make the first opening and closing block 91 and the second opening and closing block 92 fit tightly together, realizing the quick clamping and disassembly of the cylinder.

[0036] Furthermore, both the first opening block 91 and the second opening block 92 have V-shaped clamping cavities inside, which can stably clamp mainstream shock absorber cylinders with a diameter range of 30mm to 60mm, improving the adaptability of the device. The inner walls of the V-shaped clamping cavities inside the first opening block 91 and the second opening block 92 are fixedly installed with elastic rubber pads 14. The elastic rubber pads 14 can prevent the clamping cavity from directly contacting the shock absorber cylinder, prevent the surface coating of the shock absorber cylinder from being worn, and at the same time enhance the fit with the cylinder through elastic deformation, improve clamping stability, and reduce additional noise caused by clamping loosening during the test.

[0037] The working principle of this utility model is as follows: First, the device is assembled and prepared. The support arm 2 is fixed in the slot of the base 1 by the first bolt 10 to ensure that the support arm 2 is vertical and without tilt. The tension and compression sensor 8 is connected to the external display terminal and the zero point calibration is completed. At this time, the guide seat 3 is sleeved on the support arm 2 through the lifting wheel 4 on the inner wall. Because the lifting wheel 4 is tightly fitted with the outer wall of the support arm 2 (without sliding gap), the guide seat 3 can slide smoothly along the support arm 2 without radial movement.

[0038] Next, gapless height positioning is performed. According to the clamping height requirements of the cylinder of the shock absorber to be tested, the guide seat 3 is manually pushed to slide along the support arm 2. The height position of the clamping opening and closing block 9 is precisely adjusted by the guiding action of the lifting wheel 4. When the preset height is reached, the fastening plate 13 is pressed onto the surface of the guide seat 3 and the locking bolt 12 is rotated so that the anti-slip rubber pad on the inner wall of the fastening plate 13 is completely attached to the outer wall of the support arm 2, and the fixation is completed. At this time, there is no sliding gap between the guide seat 3 and the support arm 2, ensuring that the height position remains stable during high-speed testing.

[0039] Then, the shock absorber is stabilized and clamped. The second bolt 93 of the clamping block 9 is loosened, the first opening block 91 and the second opening block 92 are opened, and the shock absorber cylinder is placed into the clamping cavity formed by the two. The bottom of the shock absorber is placed on the base 1. Then, the second bolt 93 is tightened so that the first opening block 91 and the second opening block 92 are brought closer to each other until the elastic rubber pads 14 on the inner walls of the two are tightly attached to the outer wall of the cylinder. The elastic deformation of the elastic rubber pads 14 fills the clamping gap, thereby achieving the vibration-free fixation of the shock absorber cylinder.

[0040] Next, the lateral force is precisely applied and locked. According to the lateral force value set in the test, the thrust sleeve 6 is manually rotated. Since the thrust sleeve 6 and the threaded centering seat 5 are threadedly fitted, during the rotation, the thrust sleeve 6 drives the centering shaft 7 to move towards the damper cylinder to apply thrust or to move away from the damper cylinder to apply tension. The centering shaft 7 and the threaded centering seat 5 are coaxially designed to ensure that the lateral force application direction is accurate and without deviation. The tension and compression sensor 8 collects the lateral force data transmitted by the centering shaft 7 in real time and displays it intuitively on the external display terminal. When the force value reaches the set value, the rotation of the thrust sleeve 6 is stopped, and the positioning bolt 15 on the thrust sleeve 6 is tightened so that the end of the positioning bolt 15 presses against the threaded centering seat 5, locking the position of the thrust sleeve 6 to prevent the thrust sleeve 6 from loosening due to vibration during the high-speed test and thus causing force value fluctuations.

[0041] Finally, a high-speed noise test was conducted. The entire device was placed on the comprehensive performance test bench for the shock absorber. The bottom of the base 1 was fixedly connected to the main shaft of the actuator on the test bench with bolts. The piston rod end of the shock absorber was fixed by the matching fixture on the test bench to ensure that the shock absorber could reciprocate with the actuator on the test bench. After the test bench was started, the test bench simulated high-speed driving conditions according to the set parameters. At this time, the backlash-free height adjustment mechanism (guide seat 3, lifting wheel 4, locking assembly) of this device ensured the stability of the lateral force application point. The tension and compression sensor 8 continuously monitored the lateral force value and provided real-time feedback to ensure that the force value fluctuation was controlled within a reasonable range.

[0042] The test bench synchronously collects noise data from the vibration damper. Since there is no additional clearance in the height adjustment mechanism, transmission mechanism, and clamping mechanism, the collected noise data can truly reflect the acoustic performance of the vibration damper itself. After the test, the test bench is closed, the positioning bolt 15 and the thrust sleeve 6 are loosened, the second bolt 93 is removed, and the vibration damper is taken out. Combining the noise data with the appearance damage of the vibration damper (such as whether the cylinder is deformed or whether there is oil leakage), the high-speed noise performance and structural reliability of the vibration damper under lateral force are evaluated.

[0043] 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 high speed noise test independent centering lateral force loading device comprising a base (1) and a support arm (2) disposed on the base (1), characterized in that: The outer surface of the support arm (2) is slidably connected to a guide seat (3), and the inner wall of the guide seat (3) is rotatably connected to a lifting wheel (4). The lifting wheel (4) is in contact with the outer wall of the support arm (2), and the outer surface of the lifting wheel (4) is provided with an elastic rubber sleeve. The guide seat (3) is provided with a locking component. A threaded centering seat (5) is fixedly installed on one side of the guide seat (3). A thrust sleeve (6) is threadedly connected to the outer surface of the threaded centering seat (5). A centering shaft (7) is rotatably connected to one side of the thrust sleeve (6). A tension / compression sensor (8) is fixedly installed at the end of the centering shaft (7) away from the thrust sleeve (6). A clamping opening / closing block (9) is provided at the end of the tension / compression sensor (8) away from the centering shaft (7).

2. The high-speed noise testing independent centering lateral force application device according to claim 1, characterized in that: The base (1) has a slot inside that is adapted to the support arm (2), and the base (1) and the support arm (2) are connected by a first bolt (10).

3. The high speed noise test self-centering lateral force application apparatus of claim 1, wherein: The locking assembly includes a spring (11) and a locking bolt (12). One end of the spring (11) is fixedly connected to the inner wall of the guide seat (3), and the other end of the spring (11) is fixedly connected to a fastening plate (13). An anti-slip rubber pad is fixedly installed on the side of the fastening plate (13) near the guide seat (3). A through groove adapted to the locking bolt (12) is opened inside the guide seat (3). An elastic rubber ring is fixedly installed on the inner wall of the through groove opened inside the guide seat (3). A threaded groove adapted to the locking bolt (12) is opened inside the fastening plate (13). The locking bolt (12) can pass through the through groove into the inside of the spring (11) and be threadedly connected to the threaded groove opened inside the fastening plate (13).

4. The high speed noise test self-centering lateral force application apparatus of claim 1, wherein: The clamping opening and closing block (9) includes a first opening and closing block (91) and a second opening and closing block (92) disposed on one side of the first opening and closing block (91). One side of the first opening and closing block (91) is fixedly connected to the tension and compression sensor (8). The first opening and closing block (91) and the second opening and closing block (92) are connected by a second bolt (93).

5. The high speed noise test self-centering lateral force application apparatus of claim 4, wherein: The first opening block (91) and the second opening block (92) are both provided with V-shaped clamping cavities. The inner walls of the V-shaped clamping cavities provided in the first opening block (91) and the second opening block (92) are fixedly installed with elastic rubber pads (14).

6. The high speed noise test self-centering lateral force application apparatus of claim 1, wherein: The thrust sleeve (6) has an internal threaded connection with a positioning bolt (15), which can contact the threaded centering seat (5).

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