A shock absorber damping force testing device

Abstract

The present application relates to the technical field of shock absorber testing, in particular to a shock absorber damping force testing device, which comprises a testing base, a fixing frame, a fixing support plate, a pressure sensor, a hydraulic cylinder and a sliding block, and further comprises a displacement sensor, a moving frame, a limiting assembly, an auxiliary assembly and a plug-in assembly; two of the four moving frames are arranged in parallel on the surface of the testing base, and the middle two moving frames are fixedly attached and their bottoms are attached to the surface of the sliding block; the diameter of the cylindrical barrel which plays the role of "plug shaft" is set to be small; after the cylindrical barrel is inserted into the end mounting hole of the shock absorber, the end of the shock absorber pushes the auxiliary assembly to move, so that the plug-in assembly is further expanded; and the shock absorber is placed horizontally, thereby solving the problems in the prior art that the setting of the diameter of the plug shaft is consistent with the diameter of the mounting hole, which leads to low testing efficiency, and when the diameter of the plug shaft is set to be smaller than the diameter of the mounting hole, the plug shaft cannot form a stable connection with the shock absorber, which causes damage to the end of the shock absorber.

Description

Technical Field

[0001] This invention relates to the field of shock absorber testing technology, specifically to a shock absorber damping force testing device. Background Technology

[0002] To reduce the impact of vibrations on riders and improve riding comfort, electric bicycles typically have shock absorbers installed between the wheels and the frame. Before being installed on electric vehicles, the damping force of the manufactured shock absorbers needs to be tested to ensure that all manufactured shock absorbers of the same specification are of consistent size. This prevents the wheels from bouncing due to different damping forces on both sides of the wheel after installation.

[0003] When testing the damping force of shock absorbers for electric bicycles, the mounting holes at both ends of the shock absorber need to be aligned with the insertion shaft on the testing device, so that the shock absorber forms a stable connection with the damping force testing device through the mounting holes. Then, the testing device applies pressure to the shock absorber, and the pressure and deformation of the shock absorber during the compression process are monitored by pressure sensors and displacement sensors, respectively, to obtain a set of test curves. By analyzing and processing these curves, the damping force of the shock absorber can be obtained.

[0004] In existing technologies, the damping force of shock absorbers is often tested by vertically suspending them on a testing device. When the damping force testing device applies pressure to the shock absorber, the external force on the piston rod of the shock absorber includes not only the pressure of the damping force testing device but also its own weight, which leads to a certain error in the accuracy of the damping force test. In addition, if the diameter of the insert shaft is kept consistent with the diameter of the mounting hole after aligning the mounting hole at the end of the shock absorber, the efficiency of placing the shock absorber on the damping force testing device will be reduced, resulting in low damping force testing efficiency. If the diameter of the insert shaft is set much smaller than the diameter of the mounting hole, the insert shaft cannot form a stable connection with the shock absorber through the mounting hole during the test, and the end of the shock absorber is easily damaged when the test pressure is too high.

[0005] To address this, a device for testing the damping force of a shock absorber is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a shock absorber damping force testing device. By setting the diameter of the cylindrical tube that acts as a "shaft" to a smaller size, after the cylindrical tube is inserted into the mounting hole at the end of the shock absorber, the end of the shock absorber pushes the auxiliary component to move, causing the insertion component to further unfold. By adopting a horizontally placed shock absorber, this invention solves the problems in the prior art where setting the diameter of the shaft to be the same as the diameter of the mounting hole leads to low testing efficiency, and when the diameter of the shaft is set to be smaller than the diameter of the mounting hole, the shaft cannot form a stable connection with the shock absorber, causing damage to the end of the shock absorber. This invention not only ensures the testing efficiency and accuracy of electric bicycle shock absorbers, but also effectively adapts to shock absorbers with mounting holes of different sizes, fully ensuring the stability between the shock absorber and the damping force testing device, and preventing damage to the end of the shock absorber after testing.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A shock absorber damping force testing device includes a test base, a fixed frame, a fixed support plate, a pressure sensor, a hydraulic cylinder, and a slider. It also includes a displacement sensor, a moving frame, a limiting component, an auxiliary component, and a plug-in component. Four moving frames are arranged parallel to each other on the surface of the test base, with the two middle moving frames fixedly fitted together and their bottoms abutting the surface of the slider. The displacement sensor is installed on the side of the two middle moving frames near the fixed frame. The limiting component is installed between two moving frames with a gap, extending towards the fixed frame. The auxiliary component is slidably connected to the limiting component. The plug-in component is installed at the end of the limiting component near the fixed frame. After the plug-in component is inserted into the mounting hole at the end of the shock absorber, the hydraulic cylinder contracts, causing the moving frame to move towards the fixed frame. The end of the shock absorber pushes the auxiliary component towards the moving frame. The auxiliary component provides power input to the plug-in component through the limiting component. The plug-in component gradually unfolds until its axis coincides with the center of the mounting hole at the end of the shock absorber.

[0009] Preferably, the limiting component includes a fixed plate, a baffle, a first gear, and a transmission gearbox. The fixed plate is installed between two movable frames, and a through hole is provided on the side wall of the fixed plate. The baffle is fitted into the through hole. The first gear is rotatably disposed inside the fixed plate. The transmission gearbox is installed between the fixed plate and one of the movable frames located in the middle, and a gear set that is connected to the first gear is provided inside the transmission gearbox.

[0010] Preferably, the auxiliary component includes a toothed groove, a through rod, a return spring, a bonding plate, and a sliding piece. The toothed groove is formed on the side of the through rod near the first gear and is connected to the first gear. The through rod is slidably connected to the fixing plate and is adapted to the through hole. The return spring is disposed between the baffle and the through rod. The bonding plate is installed at the end of the through rod, and the sliding piece is slidably installed on the side wall of the bonding plate.

[0011] Preferably, the surface of the through rod is constructed with a receiving groove and a vertical groove. The receiving groove is used to place a return spring, and a side plate is attached between the vertical grooves. The side wall of the side plate is flush with the end of the through rod.

[0012] Preferably, the side wall of the bonding plate is arc-shaped, and a limiting groove adapted to the sliding piece is provided on the side of the bonding plate near the fixing frame. The side wall of the sliding piece is connected to an extension strip that penetrates the bonding plate, and the extension strip is offset from the through rod.

[0013] Preferably, the insertion assembly includes a cylindrical tube, a slotted groove, a tapered seat, a threaded rod, a clamping block, an extension shaft, a second gear, and a movable disk. The cylindrical tube is fixed to the end of the transmission gearbox. The multiple slotted grooves are arranged in a circular array about the axis of the cylindrical tube. The tapered seat is installed at the end of the cylindrical tube away from the transmission gearbox. The threaded rod is rotatably connected to the tapered seat and extends into the interior of the cylindrical tube. The clamping block is rotatably disposed within the slotted groove. The extension shaft is connected to the end of the threaded rod and extends into the transmission gearbox. The second gear is installed at the end of the extension shaft and meshes with a gear set in the transmission gearbox. The movable disk is disposed inside the cylindrical tube and is threadedly connected to the threaded rod.

[0014] Preferably, the side view of the abutment block is a right-angled trapezoid, and the right-angled side of the abutment block away from the second gear is the short side, and the abutment block is constructed with an inclined groove on the side near the threaded rod.

[0015] Preferably, the outer circumference of the movable disk is integrally formed with a protrusion, and the protrusion is adapted to the inclined groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. When applied to the damping force test of electric bicycle shock absorbers, the diameter of the cylindrical tube that acts as a "shaft insert" is set smaller than the mounting hole of the shock absorber. This allows the shock absorber to be quickly placed horizontally and limited. As the damping force test proceeds, the end of the shock absorber pushes the auxiliary component to move. The relative displacement between the auxiliary component and the limiting component allows the insertion component to unfold. This not only quickly limits and fixes the shock absorber but also makes the axis of the cylindrical tube coincide with the center of the mounting hole of the shock absorber. This ensures that the shock absorber and the insertion component are stably limited and fitted, effectively avoiding end damage to the shock absorber during the damping force test.

[0018] 2. Through the design of the plug-in assembly and auxiliary assembly, the initial diameter of the cylindrical tube is relatively small, making it convenient to place the shock absorber between the fixed support plate and the cylindrical tube without precise alignment. During the initial stage of the damping force test, although the hydraulic cylinder retracts, the piston rod of the electric bicycle shock absorber does not shift. During this process, the displacement of the auxiliary assembly varies depending on the diameter of the shock absorber mounting hole. When the auxiliary assembly shifts, it provides the power input for the expansion of the plug-in assembly. When the auxiliary assembly stops shifting, the plug-in assembly has expanded to the corresponding state according to the diameter of the mounting hole, with the center of the mounting hole coinciding with the axis of the cylindrical tube. The plug-in assembly then provides stable support for the shock absorber from inside the mounting hole and the side wall of the shock absorber, thereby effectively ensuring the stability of the shock absorber during the damping force test and preventing damage to the end of the shock absorber when subjected to pressure from the retraction of the hydraulic cylinder.

[0019] 3. By setting limit components and auxiliary components, when the auxiliary component stops generating relative displacement with the limit component, it means that the axis of the cylindrical tube coincides with the center of the mounting hole. At this time, the sliding plate also stops displacing. By recording the displacement of the displacement sensor after the sliding plate stops displacing, the accurate displacement during the damping force test of the shock absorber can be obtained, thereby further improving the accuracy of the damping force test of the shock absorber. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the limiting component and the auxiliary component of the present invention;

[0022] Figure 3 This is a schematic diagram of the limiting component of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the auxiliary component of the present invention;

[0024] Figure 5 This is a schematic diagram of the through rod structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the plug-in assembly of the present invention;

[0026] Figure 7 This is a schematic diagram of the threaded rod and extension shaft of the present invention;

[0027] Figure 8 This is a schematic diagram of the structure of the clamping block and the movable disk of the present invention.

[0028] In the diagram: 1. Test base; 2. Fixing frame; 3. Fixing support plate; 4. Pressure sensor; 5. Hydraulic cylinder; 6. Slider; 7. Displacement sensor; 8. Moving frame; 9. Limiting assembly; 91. Fixing plate; 911. Through hole; 92. Baffle; 93. First gear; 94. Transmission gearbox; 10. Auxiliary assembly; 101. Gear groove; 102. Through rod; 1021. Receiving groove; 1022. Side plate; 1023, Vertical groove; 103, Return spring; 104, Adhesive plate; 1041, Limiting groove; 105, Sliding piece; 1051, Extension strip; 11, Plug-in assembly; 111, Cylindrical tube; 112, Through groove; 113, Conical seat; 114, Threaded rod; 115, Clamping block; 1151, Inclined groove; 116, Extension shaft; 117, Second gear; 118, Moving disk; 1181, Protrusion. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1 to 8 This invention provides a shock absorber damping force testing device, the technical solution of which is as follows:

[0031] Reference Figure 1A shock absorber damping force testing device includes a test base 1, a fixing frame 2, a fixing support plate 3, a pressure sensor 4, a hydraulic cylinder 5, and a slider 6. The test base 1 is placed horizontally, with a pad between its bottom and the ground. A slot is formed on the surface of the test base 1. There are four fixing frames 2, arranged in pairs, with two pairs of fixing frames 2 installed side by side on the surface of the test base 1 and the two pairs of fixing frames 2 fitting together. There are two fixing support plates 3, which are respectively fitted and fixed between the side walls of the two fixing frames 2 in the corresponding pairs. The fixing support plate 3 has an arc-shaped groove on the side near the hydraulic cylinder 5 for quickly limiting the end of the shock absorber and adapting to the end. Shock absorbers of different sizes are used. Two pressure sensors 4 are respectively installed on the side walls of two fixed support plates 3. When the force value of the pressure sensor 4 remains unchanged, it means that the shock absorber has reached a stable limit state between the fixed support plate 3 and the plug-in assembly 11. The hydraulic cylinder 5 is installed in a slot on the surface of the test base 1. The slider 6 is slidably set in the slot, and the end of the slider 6 is fixedly connected to the end of the piston rod of the hydraulic cylinder 5. It also includes a displacement sensor 7, a moving frame 8, a limit assembly 9, an auxiliary assembly 10, and a plug-in assembly 11. The four moving frames 8 are arranged in pairs parallel to each other on the surface of the test base 1. The positions of the four moving frames 8 correspond to the four fixed frames 2. The four fixed frames 2 and the four moving frames 8 are respectively The two movable frames 8 are located in a straight line and are fixedly attached to each other, with their bottoms in contact with the surface of the slider 6. Displacement sensors 7 are installed on the side of the two movable frames 8 closest to the fixed frame 2. These sensors detect the movement distance of the movable frames 8 and accurately determine the displacement of the shock absorber piston rod due to deformation. Combined with the changes in the pressure sensor 4, a set of test curves for the shock absorber can be obtained. From this, combined with the calculation formula, the damping force of the shock absorber can be calculated. Two sets of limiting components 9 are installed between the two movable frames 8 with a gap, one set on each set of movable frame 8, and the limiting components 9 extend towards the fixed frame 2 to assist in... Component 10 is slidably connected to the limiting component 9. The plug-in component 11 is installed at the end of the limiting component 9 near the fixed frame 2. After the plug-in component 11 is inserted into the mounting hole at the end of the shock absorber, the hydraulic cylinder 5 retracts, causing the moving frame 8 to move towards the fixed frame 2. The end of the shock absorber pushes the auxiliary component 10 to move towards the moving frame 8. The auxiliary component 10 provides power input to the plug-in component 11 through the limiting component 9. The plug-in component 11 gradually unfolds until the axis of the plug-in component 11 coincides with the center of the mounting hole at the end of the shock absorber. After the plug-in component 11 is fully unfolded, it can stably limit the shock absorber between the plug-in component 11 and the auxiliary component 10. Furthermore, the auxiliary component 10 and the limiting component 9 will not have any relative displacement afterward.

[0032] Reference Figure 1 , Figure 2 and Figure 3In one embodiment of the present invention, the limiting component 9 specifically includes a fixed plate 91, a baffle 92, a first gear 93, and a transmission gearbox 94. The fixed plate 91 is installed between two movable frames 8. A through hole 911 is provided on the side wall of the fixed plate 91. The lower half of the through hole 911 is adapted to the auxiliary component 10. The baffle 92 is fitted into the through hole 911. The baffle 92 is installed in the upper half of the through hole 911. The bottom of the baffle 92 is slidably fitted with the auxiliary component 10. The first gear 93 is rotatably disposed inside the fixed plate 91. A portion of the outer periphery of the first gear 93 extends into the lower half of the through hole 911. The transmission gearbox 94 is installed between the fixed plate 91 and one of the movable frames 8 located in the middle. The transmission gearbox 94 is provided with a gear set that is connected to the first gear 93. The gear set is used to transmit the rotation of the first gear 93 to the plug-in assembly 11 and change the transmission direction. When the auxiliary assembly 10 is displaced, the first gear 93 rotates under the action of the auxiliary assembly 10. The rotation of the first gear 93 can provide power input to the transmission gearbox 94. The transmission gearbox 94 then provides power input to the plug-in assembly 11 for a corresponding duration. When the plug-in assembly 11 is driven, its expansion range is proportional to the driving time.

[0033] Reference Figure 2 and Figure 4 In one embodiment of the present invention, the auxiliary component 10 specifically includes a toothed groove 101, a through rod 102, a return spring 103, a fitting plate 104, and a sliding piece 105. The toothed groove 101 is formed on the side of the through rod 102 near the first gear 93 and is connected to the first gear 93. The through rod 102 is slidably connected to the fixing plate 91 and is adapted to the through hole 911. During the relative displacement between the through rod 102 and the fixing plate 91, under the action of the toothed groove 101, the displacement of the through rod 102 will drive the first gear 93 to rotate. Then, the first gear 93 provides power input to the limiting component 9 through the transmission gearbox 94. When the through rod 102 stops displacing, the power input to the limiting component 9 is terminated, and the limiting component 9 is correspondingly unfolded to the appropriate position. In the current state, the return spring 103 is positioned between the baffle 92 and the through rod 102. Under the action of the return spring 103, after the hydraulic cylinder 5 extends and resets, the return spring 103 pushes the through rod 102 in the opposite direction under the action of the baffle 92, causing the through rod 102 to reset. The bonding plate 104 is installed at the end of the through rod 102. The bonding plate 104 is used to assist in limiting the contact between the shock absorber and the plug assembly 11. The sliding plate 105 is slidably installed on the side wall of the bonding plate 104. The sliding plate 105 is used to contact the end of the shock absorber away from the fixed frame 2. When the sliding plate 105 stops sliding, it means that the shock absorber has reached a relatively stable state. The elastic coefficient of the return spring 103 is large enough to ensure that the elastic force of the return spring 103 can push the through rod 102 to reset after the hydraulic cylinder 5 resets.

[0034] Reference Figure 4and Figure 5 As one embodiment of the present invention, specifically, the surface of the through rod 102 is constructed with a receiving groove 1021 and a vertical groove 1023. The receiving groove 1021 is used to place the return spring 103. A side plate 1022 is attached between the vertical grooves 1023. The side wall of the side plate 1022 is flush with the end of the through rod 102. Under the action of the side plate 1022, the through rod 102 can be separated from the fixing plate 91 without pulling the through rod 102 to one side of the fixing frame 2.

[0035] Reference Figure 4 As one embodiment of the present invention, specifically, the side wall of the bonding plate 104 is arc-shaped, and the bonding plate 104 is provided with a limiting groove 1041 adapted to the sliding piece 105 on the side near the fixing frame 2. The side wall of the sliding piece 105 is connected to an extension strip 1051 that penetrates the bonding plate 104, and the extension strip 1051 is offset from the through rod 102. A micro displacement device and a timer are provided between the sliding piece 105 and the bonding plate 104.

[0036] Reference Figure 6 and Figure 7As one embodiment of the present invention, specifically, the plug-in assembly 11 includes a cylindrical tube 111, a through slot 112, a tapered seat 113, a threaded rod 114, a clamping block 115, an extension shaft 116, a second gear 117, and a movable disk 118. The cylindrical tube 111 is fixed to the end of the transmission gearbox 94. An elastic sleeve is slidably provided on the outer periphery of the cylindrical tube 111 near the end of the transmission gearbox 94. The diameter of the edge of the elastic sleeve near the transmission gearbox 94 is much larger than the maximum value of the shock absorber mounting hole. Under the action of the elastic sleeve, the end of the shock absorber can be... Pushing towards the side away from the transmission gearbox 94, multiple through slots 112 are arranged in a circular array about the axis of the cylindrical tube 111, and the through slots 112 are connected to the interior of the cylindrical tube 111. The conical seat 113 is installed at the end of the cylindrical tube 111 away from the transmission gearbox 94. Under the action of the conical seat 113, not only can the end of the cylindrical tube 111 be closed, but it also facilitates the quick placement of the shock absorber on the outer circumference of the cylindrical tube 111 after aligning the mounting hole of the shock absorber with the cylindrical tube 111. The threaded rod 114 is rotatably connected to the conical seat 113, and the thread... Rod 114 extends into the interior of cylindrical tube 111. A retaining block 115 is rotatably disposed within a slot 112. An extension shaft 116 is connected to the end of threaded rod 114, and the end of extension shaft 116 extends into transmission gearbox 94. A second gear 117 is mounted on the end of extension shaft 116 and meshes with a gear set within transmission gearbox 94. A movable disk 118 is disposed inside cylindrical tube 111 and threadedly connected to threaded rod 114. When transmission gearbox 94 provides power input to the insertion assembly 11, the first… Under the action of the transmission gearbox 94, the second gear 117 rotates in the corresponding direction. Then, the second gear 117 drives the threaded rod 114 to rotate in the same direction through the extension shaft 116. When the threaded rod 114 rotates clockwise, it can drive the movable disk 118 to move towards the side of the corresponding second gear 117, thereby changing the contact area between the movable disk 118 and the pressing block 115, thus changing the expansion range of the pressing block 115. When the second gear 117 stops rotating, the movable disk 118 also stops moving, and the pressing block 115 maintains a constant expansion range.

[0037] Reference Figure 8In one embodiment of the present invention, the side view of the clamping block 115 is a right-angled trapezoid, and the right-angled side of the clamping block 115 away from the second gear 117 is the shorter side. Due to the dimensional design of the clamping block 115, when the moving disk 118 moves towards the side corresponding to the second gear 117, the distance between adjacent sides of the clamping block 115 gradually decreases, while the outer diameter of the moving disk 118 remains unchanged. This results in an increase in the area of ​​the clamping block 115 exposed outside the cylindrical tube 111, thereby expanding the unfolding range of the clamping block 115. Ensure that the clamping block 115 clamps the shock absorber from the side away from the elastic sleeve. The clamping block 115 has a groove 1151 on the side near the threaded rod 114. The outer circumference of the movable disk 118 is integrally formed with a protrusion 1181, and the protrusion 1181 is adapted to the groove 1151. Under the cooperation of the groove 1151 and the protrusion 1181, when the threaded rod 114 rotates, the protrusion 1181 moves along the groove 1151, so that the movable disk 118 will not rotate with the threaded rod 114. The movable disk 118 can only move in the horizontal direction.

[0038] Working principle: First, the hydraulic cylinder 5 is retracted to a suitable length. Then, one end of the electric bicycle shock absorber is fitted with the arc-shaped groove on the side wall of the fixed support plate 3. The mounting hole of the other end of the shock absorber is aligned with the plug-in assembly 11 and then placed horizontally between the fixed support plate 3 and the plug-in assembly 11. At this time, the plug-in assembly 11 is located on the side of the mounting hole center that is biased towards the fixed plate 91. Then, the hydraulic cylinder 5 is gradually retracted to perform the damping force test of the piston rod.

[0039] Specifically, as the hydraulic cylinder 5 continues to retract, it drives the movable frame 8 to move towards the fixed frame 2 via the slider 6. The movable frame 8 drives the fixed plate 91, the transmission gearbox 94, and the cylindrical tube 111 to move horizontally together. During this process, the end of the shock absorber pushes the sliding plate 105 into the limiting groove 1041 of the bonding plate 104. When the bonding plate 104 is fully inserted into the limiting groove 1041, the end of the shock absorber is in contact with the side wall of the bonding plate 104. The shock absorber pushes the through rod 102 to move towards the fixed plate 91 via the bonding plate 104. The pressure on the return spring 103 gradually increases. The toothed groove 101 on the side wall of the through rod 102 drives the first gear 93 to rotate as the through rod 102 moves. The rotation of the first gear 93 provides power input to the transmission components in the transmission gearbox 94, which in turn drives the second gear 117 to rotate clockwise. 7. The threaded rod 114 is driven to rotate clockwise by the extension shaft 116. When the threaded rod 114 rotates clockwise, the moving disk 118 moves towards the corresponding second gear 117 side under the action of the protrusion 1181 and the inclined groove 1151. When the moving disk 118 moves, the contact position with the pressing block 115 gradually changes, thereby increasing the area of ​​the pressing block 115 exposed from the cylindrical tube 111. The pressing block 115 is inclined and presses the shock absorber against the elastic sleeve side wall from the side wall of the shock absorber until the center of the mounting hole coincides with the axis of the cylindrical tube 111. Then the bonding plate 104 and the through rod 102 will no longer have relative displacement with the fixed plate 91. In the subsequent process of the hydraulic cylinder 5 continuing to retract, the displacement value measured by the displacement sensor 7 is the magnitude of the piston rod displacement of the shock absorber. Combined with the measurement value of the pressure sensor 4, the magnitude of the damping force of the shock absorber can be obtained by calculation formula.

[0040] Finally, extend and reset the hydraulic cylinder 5 to its initial state. Under the action of the reset spring 103, push the through rod 102 in the opposite direction to reset it. At this time, the threaded rod 114 will rotate counterclockwise when the through rod 102 moves in the opposite direction until the pressing block 115 retracts into the slot 112. Then the shock absorber can be quickly removed from the outer periphery of the cylindrical tube 111.

[0041] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A damping force testing device for a shock absorber, comprising a test base (1), a fixing frame (2), a fixing support plate (3), a pressure sensor (4), a hydraulic cylinder (5), and a slider (6), characterized in that: It also includes a displacement sensor (7), a moving frame (8), a limiting component (9), an auxiliary component (10), and a plug-in component (11). The four moving frames (8) are arranged in pairs parallel to each other on the surface of the test base (1), and the two middle moving frames (8) are fixedly attached and their bottoms are attached to the surface of the slider (6). The displacement sensor (7) is installed on the side of the two middle moving frames (8) near the fixed frame (2). The limiting component (9) is installed between two moving frames (8) with a gap, and the limiting component (9) extends towards the fixed frame (2). The auxiliary component (10) is connected to the limiting component. The component (9) is slidably connected. The plug-in component (11) is installed at the end of the limiting component (9) near the fixed frame (2). After the plug-in component (11) is inserted into the mounting hole of the shock absorber end, the hydraulic cylinder (5) retracts and drives the moving frame (8) to move towards the fixed frame (2). The end of the shock absorber pushes the auxiliary component (10) to move towards the moving frame (8). The auxiliary component (10) provides power input to the plug-in component (11) through the limiting component (9). The plug-in component (11) gradually unfolds until the axis of the plug-in component (11) coincides with the center of the mounting hole of the shock absorber end. The limiting component (9) includes a fixed plate (91), a baffle (92), a first gear (93), and a transmission gearbox (94). The fixed plate (91) is installed between two movable frames (8). The side wall of the fixed plate (91) has a through hole (911). The baffle (92) is fitted into the through hole (911). The first gear (93) is rotatably disposed inside the fixed plate (91). The transmission gearbox (94) is installed between the fixed plate (91) and one of the movable frames (8) located in the middle. The transmission gearbox (94) is provided with a gear set that is connected to the first gear (93) for transmission.

2. The shock absorber damping force testing device according to claim 1, characterized in that: The auxiliary component (10) includes a toothed groove (101), a through rod (102), a return spring (103), a bonding plate (104), and a sliding piece (105). The toothed groove (101) is formed on the side of the through rod (102) near the first gear (93) and is connected to the first gear. The through rod (102) is slidably connected to the fixing plate (91) and is adapted to the through hole (911). The return spring (103) is disposed between the baffle (92) and the through rod (102). The bonding plate (104) is installed at the end of the through rod (102), and the sliding piece (105) is slidably installed on the side wall of the bonding plate (104).

3. The damper damping force testing device according to claim 2, characterized in that: The surface of the through rod (102) is constructed with a receiving groove (1021) and a vertical groove (1023). The receiving groove (1021) is used to place the return spring (103). A side plate (1022) is attached between the vertical grooves (1023). The side wall of the side plate (1022) is flush with the end of the through rod (102).

4. The damping force testing device for shock absorbers according to claim 2, characterized in that: The side wall of the bonding plate (104) is arc-shaped, and a limiting groove (1041) adapted to the sliding piece (105) is provided on the side of the bonding plate (104) near the fixing frame (2). The side wall of the sliding piece (105) is connected to an extension strip (1051) that penetrates the bonding plate (104), and the extension strip (1051) is offset from the through rod (102).

5. The damping force testing device for shock absorbers according to claim 1, characterized in that: The plug-in assembly (11) includes a cylindrical tube (111), a through slot (112), a conical seat (113), a threaded rod (114), a clamping block (115), an extension shaft (116), a second gear (117), and a movable disk (118). The cylindrical tube (111) is fixed to the end of the transmission gearbox (94). Multiple through slots (112) are arranged in a circular array about the axis of the cylindrical tube (111). The conical seat (113) is installed at the end of the cylindrical tube (111) away from the transmission gearbox (94). The threaded rod (114) rotates with the conical seat (113). The threaded rod (114) extends into the cylindrical tube (111), the abutment block (115) is rotatably disposed in the slot (112), the extension shaft (116) is connected to the end of the threaded rod (114), and the end of the extension shaft (116) extends into the transmission gearbox (94), the second gear (117) is mounted on the end of the extension shaft (116), and the second gear (117) meshes with the gear set in the transmission gearbox (94), the movable disk (118) is disposed inside the cylindrical tube (111), and the movable disk (118) is threadedly connected to the threaded rod (114).

6. The shock absorber damping force testing device according to claim 5, characterized in that: The side view of the clamping block (115) is a right trapezoid, and the right angle side of the clamping block (115) away from the second gear (117) is the short side. The clamping block (115) has a slanted groove (1151) on the side near the threaded rod (114).

7. The shock absorber damping force testing device according to claim 6, characterized in that: The outer circumference of the movable disk (118) is integrally formed with a protrusion (1181), and the protrusion (1181) is adapted to the inclined groove (1151).

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