Axial and torsion testing tool for air spring

Abstract

The utility model discloses an axial and torsion test tool for an air spring, and the tool comprises a fixed pedestal which is rotatably provided with a connecting seat; the driving assembly is detachably mounted on one side wall of the connecting seat so as to drive the connecting seat to twist; the piston connector is arranged on the connecting seat, and an air spring to be tested is clamped and fixed between the piston connector and the connecting seat; a pressing rod; the device is simple in structure, can perform axial and torsion tests at the same time, can load different amplitudes in the axial direction and the torsion direction, can also realize bidirectional superposition, improves the practicability, can independently test the air spring without a suspension provided by a client and an accompanying test piece assembly, reduces the cost of additionally purchasing the accompanying test piece, and improves the test efficiency. And the use effect of the device is improved.

Description

Technical Field

[0001] This utility model specifically relates to a testing fixture for the axial and torsional properties of an air spring. Background Technology

[0002] Currently, air springs possess ideal non-linear elastic characteristics. With the addition of a height adjustment device, the vehicle height remains unchanged regardless of load variations. The spring stiffness can be designed to be relatively low, resulting in good ride comfort. More and more air spring manufacturers are using them in passenger vehicles. Air springs primarily rely on the flexural movement of the spring sheath for adjustment, making the verification of their durability extremely important.

[0003] Existing air spring verification tests are mostly axial verifications in a single direction, lacking the understanding of fatigue damage caused by torsion in actual use. The testing function is limited. In addition, the suspensions provided by customers are usually quarter-beam test benches, which need to be assembled with test specimens to verify the durability of the air springs. After two to three durability tests, the test specimens are usually damaged or destroyed, requiring repurchase and verification, which is costly and not convenient for low-cost testing of the torsion and axial direction of air springs. Therefore, we propose an axial and torsion testing fixture for air springs. Utility Model Content

[0004] The purpose of this invention is to provide an axial and torsional testing fixture for air springs to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an axial and torsional testing fixture for an air spring, comprising:

[0006] A fixed base, on which a connecting seat is rotatably mounted;

[0007] The drive assembly is detachably mounted on one side wall of the connector to drive the connector to rotate;

[0008] A piston connector is mounted on a connector seat, and an air spring to be tested is clamped between the piston connector and the connector seat.

[0009] The pressure rod is fixed to the piston connector to drive the piston connector to move up and down.

[0010] The connecting seat and the fixed base are provided with a pressure component to detect axial pressure.

[0011] Preferably, the lower surface of the piston connector has a first pin hole that mates with the upper pin of the air spring, and the connector has a second pin hole that mates with the lower surface of the air spring.

[0012] Preferably, the drive assembly includes a connecting rod, a second ball joint, a connector, and a drive structure. The connector engages with a threaded rod on one side wall of the connecting seat via a threaded portion. One end of the connector is provided with a second ball joint. The connecting rod is rotatably mounted on the second ball joint, and one end of the connecting rod has a drive structure to push it to move.

[0013] Preferably, the drive structure includes a first drive shaft and a first ball joint. One end of the first drive shaft has a first ball joint, and the first ball joint is rotatably engaged with a connecting rod. The other end of the first drive shaft is connected to a drive cylinder.

[0014] Preferably, the drive structure includes a transmission disk, a connecting shaft, and a second drive shaft rod. The inner edge of the transmission disk has a shaft hole that mates with the connecting shaft on the connecting rod. The second drive shaft rod is fixed to the middle of the upper surface of the transmission disk, and one end of the second drive shaft rod is connected to a drive motor.

[0015] Preferably, the transmission disc is circular, and a bushing is fitted on the outer surface of the connecting shaft.

[0016] Preferably, the pressure assembly includes a support plate, a pressure sensor, and a support bearing. The fixed base has a groove for accommodating the support bearing, and the lower surface of the support bearing is provided with a support plate that slides within the groove. The pressure sensor is located at the bottom of the groove, and the upper end of the pressure sensor is in contact with the support plate.

[0017] Preferably, the lower surface of the support plate has a first ring block, and the outer surface of the pressure sensor has a second ring block that cooperates with the ring cylinder for guidance, and the inner diameter of the first ring block is equal to the outer diameter of the second ring block.

[0018] Preferably, the cross-section of the fixed base is "T" shaped.

[0019] Preferably, the pressure rod is connected to a hydraulic cylinder that drives it to move up and down.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This invention has a simple structure and can perform axial and torsional tests simultaneously, avoiding the limitations of traditional tests that can only be performed on a single axis. This results in limited testing capabilities and makes it inconvenient to test for fatigue damage caused by torsion of the air spring during use. This invention can apply different amplitudes in the axial and torsional directions and can also achieve bidirectional superposition, improving its practicality. Furthermore, it does not require the customer to provide suspension and test components for assembly, allowing for independent testing of the air spring, reducing the cost of purchasing additional test components and improving the effectiveness of the device. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a cross-sectional view of the fixed base of this utility model;

[0024] Figure 3 This is a schematic diagram of the first drive shaft structure of this utility model;

[0025] Figure 4 This is a schematic diagram of the transmission disc structure of this utility model;

[0026] Figure 5 This is a schematic diagram of the torsion test of this utility model.

[0027] In the diagram: 1. Fixed base; 2. Connecting seat; 201. Threaded rod; 3. Pressure rod; 4. Piston connector; 5. Air spring; 6. Drive assembly; 601. Connecting rod; 602. Second ball joint; 603. Connecting piece; 604. First drive shaft; 605. First ball joint; 606. Connecting shaft; 607. Second drive shaft; 608. Transmission disc; 7. Support plate; 8. Pressure sensor; 9. Support bearing. Detailed Implementation

[0028] 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.

[0029] Please see Figures 1-5 This utility model provides a technical solution: an axial and torsional testing fixture for air springs, comprising:

[0030] A fixed base 1 is provided, and a connecting seat 2 is rotatably mounted on the fixed base 1;

[0031] The drive assembly 6 is detachably installed on one side wall of the connecting seat 2 to drive the connecting seat 2 to rotate;

[0032] This facilitates the torsion of the lower end of the air spring 5 via the connecting seat 2, thereby enabling torsion testing of the air spring 5 during axial testing or separate torsion testing.

[0033] Piston connector 4 is mounted on connector 2, and an air spring 5 to be tested is clamped between piston connector 4 and connector 2.

[0034] The pressure rod 3 is fixed to the piston connector 4 to drive the piston connector 4 to move up and down.

[0035] This allows for the compression of the air spring 5 via the piston connector 4, thereby enabling axial testing of the air spring 5's durability.

[0036] The connecting seat 2 and the fixed base 1 have a pressure component to detect axial pressure.

[0037] This facilitates the real-time detection of the pressure received by the air spring 5 during axial detection.

[0038] Preferably, the lower surface of the piston connector 4 is provided with a first pin hole that mates with the upper pin of the air spring 5, and the connecting seat 2 is provided with a second pin hole that mates with the lower surface of the air spring 5.

[0039] This facilitates better rotation of the air spring 5.

[0040] Preferably, the drive assembly 6 includes a connecting rod 601, a second ball joint 602, a connector 603, and a drive structure. The connector 603 is engaged with the threaded rod 201 on one side wall of the connecting seat 2 through a threaded portion. One end of the connector 603 is provided with the second ball joint 602. The connecting rod 601 is rotatably mounted on the second ball joint 602, and one end of the connecting rod 601 has a drive structure to push it to move.

[0041] This facilitates the rotation of the connecting seat 2, thereby causing the lower end of the air spring 5 to twist for testing.

[0042] Preferably, the drive structure includes a first drive shaft 604 and a first ball joint 605. One end of the first drive shaft 604 has a first ball joint 605, and the first ball joint 605 is rotatably engaged with the connecting rod 601. The other end of the first drive shaft 604 is connected to a drive cylinder.

[0043] This facilitates the reciprocating linear movement of the first drive shaft 604, thereby causing the connecting seat 2 to rotate.

[0044] Preferably, the drive structure includes a transmission disk 608, a connecting shaft 606, and a second drive shaft 607. The inner edge of the transmission disk 608 is provided with a shaft hole that mates with the connecting shaft 606 on the connecting rod 601. The second drive shaft 607 is fixed to the middle of the upper surface of the transmission disk 608, and one end of the second drive shaft 607 is connected to a drive motor.

[0045] This allows the transmission disc 608 to rotate by rotating the second drive shaft 607, thereby changing the position of the connecting shaft 606, which in turn pushes the connecting rod 601 to move, thus driving the connecting seat 2 to rotate.

[0046] Preferably, the transmission disc 608 is circular, and a bushing is fitted on the outer surface of the connecting shaft 606.

[0047] This helps to better avoid wear between the connecting shaft 606 and the transmission disc 608, and extends the service life of the connecting shaft 606.

[0048] Preferably, the pressure assembly includes a support plate 7, a pressure sensor 8, and a support bearing 9. The fixed base 1 has a groove for accommodating the support bearing 9, and the lower surface of the support bearing 9 is provided with a support plate 7 that slides in the groove. The pressure sensor 8 is located at the bottom of the groove, and the upper end of the pressure sensor 8 is in contact with the support plate 7.

[0049] This facilitates the vertical movement of the support plate 7, thereby preventing the pressure sensor 8 from tilting and allowing the pressure sensor 8 to detect the pressure of the axially compressed air spring 5 in real time.

[0050] Preferably, the lower surface of the support plate 7 has a first ring block, and the outer surface of the pressure sensor 8 has a second ring block that cooperates with the ring cylinder for guidance, and the inner diameter of the first ring block is equal to the outer diameter of the second ring block.

[0051] This allows the support plate 7 to move vertically up and down more easily, preventing it from tilting.

[0052] Preferably, the cross-section of the fixed base 1 is "T" shaped.

[0053] Preferably, a hydraulic cylinder is connected to the pressure rod 3 to drive it to move up and down.

[0054] This facilitates better up-and-down movement of the pressure rod 3, thereby enabling the air spring 5 to undergo axial durability testing via the piston connector 4.

[0055] The working principle and usage process of this utility model are as follows: In use, the air spring 5 is placed between the piston connector 4 and the connecting seat 2. A hydraulic cylinder is connected to the pressure rod 3. The hydraulic cylinder drives the piston connector 4 to move up and down via the pressure rod 3, thereby performing an axial durability test on the air spring 5. A displacement sensor can be installed on the upper surface edge of the piston connector 4 to monitor the axial displacement. Furthermore, a pressure sensor 8 is located between the connecting seat 2 and the fixed base 1 to detect the pressure on the air spring 5 during the axial durability test. During the torsional durability test, a drive cylinder is connected to one end of the first drive shaft 604 to drive the first drive shaft 604 to move back and forth. This causes the connecting seat 2 to rotate via the first drive shaft 604 and the second ball joint 602, thereby driving the air spring 5 to perform a reciprocating torsional test. During torsion, if... Figure 5As shown, the first drive shaft 604 moves A in the X direction, the first ball joint 605 moves A, and the second ball joint 602 moves B in the X direction. A and B are not equal, which adds a universal joint and generates an angle β, avoiding lateral force damage to the first drive shaft 604. The movement B achieves the predetermined torsion angle α = arcsinR / B. The designed air spring torsion angle is within α ± 15 degrees. In actual vehicle operation, α 11 degrees is the limit, which this design device can achieve. The length of the X-direction connecting rod 601 is designed to be more than 300mm. In the actual calculation process, B ≈ A. Therefore, in the process of calculating the torsion angle, α ≈ arcsinR / A, and the angle coincidence is more than 99%. Therefore, in this experiment, by designing different amplitudes for A on the human-machine interface, different torsion angles can be achieved, thereby achieving torsional durability. Different amplitudes are loaded on Zdir and Xdir, and bidirectional superimposed waves are realized to conduct fatigue damage tests on the bladder, which verifies the durability of the air spring and achieves the purpose of simplicity, reliability, and stability.

[0056] 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 fixture for testing the axial and torsional axial directions of an air spring, characterized in that, include: A fixed base (1) is provided with a connecting seat (2) rotatably mounted on the fixed base (1); The drive assembly (6) is detachably installed on one side wall of the connector (2) to drive the connector (2) to rotate; A piston connector (4) is disposed on a connecting seat (2), and an air spring (5) to be tested is sandwiched between the piston connector (4) and the connecting seat (2); The pressure rod (3) is fixed on the piston connector (4) to drive the piston connector (4) to move up and down; The connecting seat (2) and the fixed base (1) are provided with a pressure component to detect axial pressure.

2. The axial and torsional testing fixture for an air spring according to claim 1, characterized in that: The piston connector (4) has a first pin hole on its lower surface that mates with the pin on the air spring (5), and the connector (2) has a second pin hole that mates with the lower surface of the air spring (5).

3. The axial and torsional testing fixture for an air spring according to claim 1, characterized in that: The drive assembly (6) includes a connecting rod (601), a second ball joint (602), a connector (603), and a drive structure. The connector (603) is engaged with a threaded rod (201) on one side wall of the connecting seat (2) via a threaded portion. One end of the connector (603) is provided with a second ball joint (602). The connecting rod (601) is rotatably mounted on the second ball joint (602), and one end of the connecting rod (601) has a drive structure to push it to move.

4. The axial and torsional testing fixture for an air spring according to claim 3, characterized in that: The drive structure includes a first drive shaft (604) and a first ball joint (605). One end of the first drive shaft (604) has a first ball joint (605), and the first ball joint (605) is rotatably engaged with the connecting rod (601). The other end of the first drive shaft (604) is connected to a drive cylinder.

5. The axial and torsional testing fixture for an air spring according to claim 3, characterized in that: The drive structure includes a transmission disk (608), a connecting shaft (606), and a second drive shaft (607). The inner edge of the transmission disk (608) is provided with a shaft hole that cooperates with the connecting shaft (606) on the connecting rod (601). The second drive shaft (607) is fixed to the middle of the upper surface of the transmission disk (608), and one end of the second drive shaft (607) is connected to a drive motor.

6. The axial and torsional testing fixture for an air spring according to claim 5, characterized in that: The transmission disc (608) is circular, and a bushing is fitted on the outer surface of the connecting shaft (606).

7. The axial and torsional testing fixture for an air spring according to claim 1, characterized in that: The pressure assembly includes a support plate (7), a pressure sensor (8), and a support bearing (9). The fixed base (1) has a groove for accommodating the support bearing (9), and the lower surface of the support bearing (9) is provided with a support plate (7) that slides in the groove. The pressure sensor (8) is located at the bottom of the groove, and the upper end of the pressure sensor (8) is in contact with the support plate (7).

8. The axial and torsional testing fixture for an air spring according to claim 7, characterized in that: The lower surface of the support plate (7) has a first ring block, and the outer surface of the pressure sensor (8) has a second ring block that cooperates with the ring cylinder for guidance, and the inner diameter of the first ring block is equal to the outer diameter of the second ring block.

9. The axial and torsional testing fixture for an air spring according to claim 1, characterized in that: The fixed base (1) has a "T" shaped cross section.

10. The axial and torsional testing fixture for an air spring according to claim 1, characterized in that: The pressure rod (3) is connected to a hydraulic cylinder that drives it to move up and down.

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