Abnormal sound testing tool for shock absorber

Abstract

The utility model relates to a shock absorber abnormal sound test tool, which comprises a detection frame, a screw rod and a hydraulic jack, wherein the screw rod and the hydraulic jack are arranged up and down. The lead screw adjusts the height of the upper clamp through the lifting driving mechanism, the hydraulic jack drives the lower clamp to ascend and descend, and rapid alignment and clamping of the shock absorber are achieved. A guide frame and a V-shaped bearing are arranged between the upper clamp and the lead screw, the guide frame is matched with a sliding rail through a sliding block, the motion trail is restrained, lateral force is absorbed, and coaxiality is ensured. The upper clamp forms a rigid frame by an upper mounting plate, a lower mounting plate and a supporting rod and divides clamping stress; the lower clamp comprises a left clamping block and a right clamping block, and slots of the left clamping block and the right clamping block form a clamping hole to limit transverse displacement and increase contact area. A detachable bottom plate is arranged below the right clamping block, and clamping force is adjusted through a counterbore and an inner tapping hole. The pressing sheet type load sensor monitors the axial load in real time, and the guide frame adopts a truss type structure to improve the rigidity. The tool is suitable for different types of shock absorbers, the clamping efficiency and the testing precision are improved, and the maintenance cost is reduced.

Description

Technical Field

[0001] This utility model specifically relates to a testing fixture for abnormal noise in shock absorbers. Background Technology

[0002] Shock absorbers are the core components of a vehicle's suspension system, responsible for absorbing road impacts and stabilizing the vehicle's posture. If shock absorbers make abnormal noises and are not inspected and repaired in time, they may malfunction, affecting vehicle safety.

[0003] For example, Chinese invention patent with publication number "CN110487534B" discloses a testing machine for testing the function of shock absorbers. The testing machine includes a testing frame with guide rods at both ends. The lower end of the first fixed plate is hinged to a swing rod via a connecting rod and a pin. One end of the swing rod is hinged to a drive motor via an eccentric shaft. The upper end of the first fixed plate is provided with a slide rail, on which a clamping block is movably mounted. One end of the clamping block is connected to a drive cylinder. The lower end of the second fixed plate is provided with a lifting block that mates with the contact surface of the clamping block. The lifting block abuts against the clamping block. The upper end of the second fixed plate is provided with a shock absorber placement seat. The third fixed plate is connected to a clamping assembly via a screw assembly. A shock absorber mid-section clamping assembly is also provided between the third fixed plate and the second fixed plate.

[0004] First, the clamping assembly in this shock absorber testing machine relies on the mechanical linkage between the inverted V-shaped push slider and the clamping rod. The clamping position of the shock absorber needs to be manually adjusted multiple times in order to place the shock absorber in the predetermined direction, which is cumbersome.

[0005] Secondly, the guide rod and slide rail are uniaxial rigid supports, which cannot constrain the radial offset and torsional degrees of freedom during shock absorber testing. During testing, a certain force or torque must be applied to the shock absorber, inevitably resulting in lateral force or torque. This lateral force or torque is directly transmitted to the frame through the mechanical structure, creating parasitic vibrations (such as noise from the collision between the clamping block and the lifting block), interfering with the true signal and causing measurement data deviations. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a shock absorber noise testing fixture that addresses the shortcomings of the prior art. This fixture enables automatic alignment and locking of the upper and lower clamps of the shock absorber, significantly reducing the clamping time compared to traditional manual adjustment. It also allows for quick assembly and disassembly of the shock absorber on the testing fixture, making operation convenient.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a shock absorber noise testing fixture, including a testing frame, characterized in that: it further includes a lead screw and a hydraulic jack arranged vertically opposite each other, the lead screw is linked to a lifting drive mechanism for driving the lead screw to move vertically back and forth, the lower end of the lead screw is linked to an upper clamp for clamping the upper end of the shock absorber, and the output end of the hydraulic jack is linked to a lower clamp for clamping the lower end of the shock absorber.

[0008] Using the above technical solution, the lifting drive mechanism drives the lead screw to rise and fall, thereby adjusting the position of the upper clamp. The hydraulic jack adjusts the position of the lower clamp, placing the shock absorber between the upper and lower clamps. This achieves automatic alignment and locking of the upper and lower clamps of the shock absorber, significantly reducing clamping time compared to traditional manual adjustment. This allows for rapid assembly and disassembly of the shock absorber on the testing fixture, making operation convenient. Furthermore, this testing fixture can accommodate shock absorbers of different sizes by changing the lifting position of the lead screw. It should be noted that the "lead screw and lifting drive mechanism" can be purchased as a "lead screw jack," which is existing technology; therefore, the specific structure of the lifting drive mechanism is not detailed in this application.

[0009] The aforementioned shock absorber noise testing fixture can be further configured as follows: a guide frame is provided between the upper clamp and the lead screw, a slider is linked to the side of the guide frame, the slider is slidably engaged with a slide rail fixed on the testing frame, the upper end of the guide frame is linked to the lead screw, the lower end of the guide frame is linked to a V-type bearing, and the inner ring of the V-type bearing is linked to the upper clamp.

[0010] By adopting the above technical solution, the influence of lateral force on measurement is greatly reduced by using V-type bearings. At the same time, the characteristics of V-type bearings are used to ensure axial rotation, and the guide frame, slider, and slide rail ensure certain requirements for coaxiality.

[0011] The aforementioned shock absorber noise testing fixture can be further configured as follows: the upper clamp includes an upper mounting plate and a lower mounting plate arranged parallel to each other and spaced apart; the upper mounting plate and the lower mounting plate are connected by a number of support rods; the upper mounting plate is connected to a linkage column that inserts into the inner ring of a V-type bearing; and the lower mounting plate has a first connecting hole in the middle.

[0012] Using the above technical solution, the upper and lower mounting plates form a rigid frame through several sets of support rods, which evenly distributes the force generated during the shock absorber clamping process to the support rods, avoiding stress concentration. The first connecting hole of the lower mounting plate is aligned with the upper end of the shock absorber, and with the adaptive adjustment of the V-type bearing, the clamping coaxiality error is extremely small.

[0013] The aforementioned shock absorber noise testing fixture can be further configured as follows: the lower clamp includes a left clamping block and a right clamping block arranged opposite to each other, the left clamping block has a first slot on the side facing the right clamping block, and the right clamping block has a second slot corresponding to the first slot, the first slot and the second slot together form a clamping hole adapted to the bottom of the shock absorber.

[0014] Using the above technical solution, the left and right clamping blocks tightly wrap around the lower end of the shock absorber through the clamping holes formed by the first and second slots, restricting its lateral displacement. Simultaneously, using clamping holes to clamp the lower part of the shock absorber further reduces clamping coaxiality errors. Furthermore, compared to the existing "clamping" method, the clamping holes increase the contact area and disperse lateral force loads.

[0015] The aforementioned shock absorber noise testing fixture can be further configured as follows: a base plate extending outward is provided below the right clamping block, the left clamping block is distributed on the base plate, a main mounting hole is provided in the middle of the base plate, several sets of internal tapping holes are symmetrically provided on both sides of the left clamping block, and a set of countersunk holes is provided on the right clamping block corresponding to each set of internal tapping holes, and the countersunk holes and internal tapping holes are detachably connected by fasteners.

[0016] Using the above technical solution, an extended base plate is provided below the right clamping block to mount the left and right clamping blocks onto the pressure plate load sensor, while also preventing the left clamping block from shifting vertically relative to the right clamping block. The left and right clamping blocks are detached and connected by fasteners (standard parts such as screws) passing sequentially through countersunk holes and internal tapped holes. The clamping force between the two can be adjusted according to actual conditions to better hold the lower part of the shock absorber.

[0017] The aforementioned shock absorber noise testing fixture can be further configured such that: a pressure plate type load sensor is provided between the lower clamp and the hydraulic jack, and a second connection hole is provided above the pressure plate type load sensor.

[0018] Using the above technical solution, the plate-type load sensor can monitor the axial load during shock absorber testing in real time, so as to adjust the test load according to actual needs. The plate-type load sensor is connected to the main mounting hole of the base plate through the second connecting hole (screws or other fasteners are inserted into the main mounting hole and the second connecting hole).

[0019] The aforementioned shock absorber noise testing fixture can be further configured as follows: the guide frame includes two sets of vertical support plates arranged in a front-to-back manner, and a horizontal support plate arranged vertically between the two sets of vertical support plates, with the two ends of each set of horizontal support plates being detachably connected to the two ends of the vertical support plates respectively.

[0020] By adopting the above technical solution, the two sets of vertical support plates and the horizontal support plates arranged above and below form a truss-type rigid frame, which improves the structural strength of the guide frame, avoids the problem of deformation caused by the direct linkage between the lead screw and the upper clamp, and improves the overall working reliability of the test fixture.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0023] Figure 2 This is a front view schematic diagram of an embodiment of the present utility model;

[0024] Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle;

[0025] Figure 4 for Figure 2 Enlarged view of a portion of point B in the middle;

[0026] Figure 5 This is a schematic diagram of the upper clamp according to an embodiment of the present utility model;

[0027] Figure 6 This is an exploded view of the lower clamp and the pressure plate type load sensor according to an embodiment of the present invention.

[0028] Label annotations: 1. Testing frame; 2. Lead screw; 3. Hydraulic jack; 4. Upper clamp; 4a. Upper mounting plate; 4b. Lower mounting plate; 4c. First connecting hole; 4d. Support rod; 5. Lower clamp; 5a. Left clamp; 5b. Right clamp; 5c. First slot; 5d. Second slot; 5e. Base plate; 5f. Main mounting hole; 5g. Internal tapping hole; 5h. Countersunk hole; 6. Guide frame; 6a. Vertical support plate; 6b. Horizontal support plate; 7. Slider; 8. Slide rail; 9. V-bearing; 10. Pressure plate load sensor; 10a. Second connecting hole; 11. Shock absorber. Detailed Implementation

[0029] 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.

[0030] like Figures 1 to 6The shock absorber noise testing fixture shown includes a testing frame 1, and also includes lead screws 2 and hydraulic jacks 3 arranged vertically opposite each other. The lead screws 2 are linked to a lifting drive mechanism for vertical reciprocating movement. The lower end of the lead screws 2 is linked to an upper clamp 4 for clamping the upper end of the shock absorber 11, and the output end of the hydraulic jacks 3 is linked to a lower clamp 5 for clamping the lower end of the shock absorber 11. The lifting drive mechanism drives the lead screws 2 to rise and fall, thereby adjusting the position of the upper clamp 4. The hydraulic jacks 3 adjust the position of the lower clamp 5, placing the shock absorber 11 between the upper clamp 4 and the lower clamp 5. This achieves automatic alignment and locking of the upper and lower clamps 5 of the shock absorber 11, significantly reducing clamping time compared to traditional manual adjustment, enabling rapid assembly and disassembly of the shock absorber 11 on the testing fixture, and facilitating operation. Furthermore, this testing fixture can accommodate shock absorbers 11 of different sizes by changing the lifting position of the lead screws 2. It should be noted that the "lead screw 2 and lifting drive mechanism" can be obtained by purchasing the "lead screw 2 lifter", which is existing technology. Therefore, the specific structure of the lifting drive mechanism is not described in this application.

[0031] A guide frame 6 is provided between the upper clamp 4 and the lead screw 2. A slider 7 is linked to the side of the guide frame 6. The slider 7 is slidably engaged with a slide rail 8 fixed on the detection frame 1. The upper end of the guide frame 6 is linked to the lead screw 2, and the lower end of the guide frame 6 is linked to a V-bearing 9. The inner ring of the V-bearing 9 is linked to the upper clamp 4. The V-bearing 9 greatly reduces the influence of lateral force on the measurement. At the same time, the characteristics of the V-bearing 9 ensure axial rotation. The guide frame 6, slider 7, and slide rail 8 ensure a certain requirement for coaxiality.

[0032] The upper clamp 4 includes an upper mounting plate 4a and a lower mounting plate 4b arranged parallel to each other and spaced apart. The upper mounting plate 4a and the lower mounting plate 4b are connected by several sets of support rods 4d. The upper mounting plate 4a is connected to a linkage column that inserts into the inner ring of the V-type bearing 9. The lower mounting plate 4b has a first connecting hole 4c in the middle. The upper mounting plate 4a and the lower mounting plate 4b form a rigid frame through three sets of support rods 4d, which evenly distributes the force generated during the clamping of the shock absorber 11 to the support rods 4d, avoiding stress concentration. The first connecting hole 4c of the lower mounting plate 4b is aligned with the upper end of the shock absorber 11, and with the self-adjustment of the V-type bearing 9, the clamping coaxiality error is extremely small.

[0033] The lower clamp 5 includes a left clamping block 5a and a right clamping block 5b arranged opposite each other. The left clamping block 5a has a first slot 5c on the side facing the right clamping block 5b, and the right clamping block 5b has a second slot 5d corresponding to the first slot 5c. The first slot 5c and the second slot 5d together form a clamping hole adapted to the lower part of the shock absorber 11. The left clamping block 5a and the right clamping block 5b, through the clamping hole formed by the first slot 5c and the second slot 5d, tightly wrap around the lower end of the shock absorber 11, restricting its lateral displacement. Simultaneously, using a clamping hole to clamp the lower part of the shock absorber 11 further reduces clamping coaxiality errors. Furthermore, compared to the "clamping" method in the prior art, the clamping hole increases the contact area and disperses lateral force loads.

[0034] A base plate 5e extending outwards is provided below the right clamping block 5b. The left clamping block 5a is distributed on the base plate 5e. A main mounting hole 5f is provided in the middle of the base plate 5e. Several sets of internal tapping holes 5g are symmetrically provided on both sides of the left clamping block 5a. A countersunk hole 5h is provided on the right clamping block 5b corresponding to each set of internal tapping holes 5g. The countersunk hole 5h and the internal tapping hole 5g are detachably connected by fasteners. The extended base plate 5e is provided below the right clamping block 5b to install the left clamping block 5a and the right clamping block 5b on the pressure plate type load sensor 10, while preventing the left clamping block 5a from shifting vertically relative to the right clamping block 5b. The left clamping block 5a and the right clamping block 5b are detached and connected by fasteners (standard parts such as screws) passing through the countersunk hole 5h and the internal tapping hole 5g in sequence. The clamping force between the two can be adjusted according to the actual situation to better hold the bottom of the shock absorber 11.

[0035] A pressure plate type load sensor 10 is installed between the lower clamp 5 and the hydraulic jack 3. A second connecting hole 10a is located above the pressure plate type load sensor 10. The pressure plate type load sensor 10 can monitor the axial load during the shock absorber 11 test in real time, so as to adjust the test load according to actual needs. The pressure plate type load sensor 10 is connected to the main mounting hole 5f of the base plate 5e through the second connecting hole 10a (screws or other fasteners are inserted into the main mounting hole 5f and the second connecting hole 10a).

[0036] The guide frame 6 includes two sets of vertical support plates 6a arranged front to back, and horizontal support plates 6b arranged vertically between the two sets of vertical support plates 6a. The two ends of each horizontal support plate 6b are detachably connected to the two ends of the vertical support plates 6a. The two sets of vertical support plates 6a and the horizontal support plates 6b form a truss-type rigid frame, which improves the structural strength of the guide frame 6, avoids the problem of deformation caused by the lead screw 2 directly linking with the upper clamp 4, and improves the overall working reliability of the testing fixture.

[0037] The specific working principle of this embodiment is as follows:

[0038] First, clamping: The lifting drive mechanism drives the lead screw 2 (in this embodiment, a "lead screw 2 lifter" is directly used) to move vertically, adjusting the height of the upper clamp 4 to accommodate shock absorbers 11 of different lengths. The hydraulic jack 3 drives the lower clamp 5 to rise and fall, cooperating with the upper clamp 4 to form a clamping space, ensuring precise alignment of the upper and lower ends of the shock absorber 11. The upper end of the shock absorber 11 is inserted into the first connecting hole 4c of the lower mounting plate 4b, and the clamping hole (formed by the cooperation of the first slot 5c and the second slot 5d) covers the lower end of the shock absorber 11 and is locked by a detachable fastener (countersunk hole 5h + internal tapping hole 5g).

[0039] Then, simulate actual working conditions: apply periodic or random loads (such as sine waves or step loads) to simulate the vibration and impact of the vehicle during driving. Based on the feedback from the pressure plate load sensor 10, dynamically adjust the height of the lead screw 2 to ensure that the load direction is consistent with the axis of the shock absorber 11.

Claims

1. A testing fixture for abnormal noise in a shock absorber, comprising a testing frame, characterized in that: It also includes lead screws and hydraulic jacks arranged vertically opposite each other. The lead screws are linked to a lifting drive mechanism for driving the lead screws to move vertically back and forth. The lower end of the lead screws is linked to an upper clamp for clamping the upper end of the shock absorber. The output end of the hydraulic jacks is linked to a lower clamp for clamping the lower end of the shock absorber.

2. The shock absorber noise testing fixture according to claim 1, characterized in that: A guide frame is provided between the upper clamp and the lead screw. A slider is linked to the side of the guide frame. The slider is slidably engaged with a slide rail fixed on the testing frame. The upper end of the guide frame is linked to the lead screw, and the lower end of the guide frame is linked to a V-type bearing. The inner ring of the V-type bearing is linked to the upper clamp.

3. The shock absorber noise testing fixture according to claim 2, characterized in that: The upper clamp includes an upper mounting plate and a lower mounting plate that are parallel to each other and spaced apart. The upper mounting plate and the lower mounting plate are connected by a number of support rods. The upper mounting plate is connected to a linkage column that inserts into the inner ring of a V-type bearing. The lower mounting plate has a first connecting hole in the middle.

4. The shock absorber noise testing fixture according to claim 1, characterized in that: The lower clamp includes a left clamping block and a right clamping block arranged opposite each other. The left clamping block has a first slot on the side facing the right clamping block, and the right clamping block has a second slot corresponding to the first slot. The first slot and the second slot together form a clamping hole adapted to the bottom of the shock absorber.

5. The shock absorber noise testing fixture according to claim 4, characterized in that: The right clamping block has a base plate extending outward below it, the left clamping block is distributed on the base plate, the base plate has a main mounting hole in the middle, the left clamping block has several sets of internal tapping holes symmetrically arranged on both sides, and the right clamping block has a set of countersunk holes corresponding to each set of internal tapping holes. The countersunk holes and the internal tapping holes are detachably connected by fasteners.

6. A shock absorber noise testing fixture according to any one of claims 1 to 5, characterized in that: A pressure plate type load sensor is provided between the lower clamp and the hydraulic jack, and a second connection hole is provided above the pressure plate type load sensor.

7. The shock absorber noise testing fixture according to claim 2, characterized in that: The guide frame includes two sets of vertical support plates arranged in a front-to-back manner, and a horizontal support plate arranged vertically between the two sets of vertical support plates. The two ends of each set of horizontal support plates are detachably connected to the two ends of the vertical support plates.

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