Axial and torsion testing tool for air spring

Abstract

The invention 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 air spring testing device is simple in structure, axial and torsion tests can be carried out simultaneously, different amplitudes can be loaded in the axial direction and the torsion direction, bidirectional superposition can also be achieved, practicability is improved, the air spring can be tested independently without a suspension provided by a client and assembly of an accompanying test piece, the cost for additionally purchasing the accompanying test piece is reduced, and the testing efficiency is improved. And the use effect of the device is improved.

Description

Technical Field

[0001] The present invention specifically relates to an axial and torsional test tooling for an air spring. Background Art

[0002] At present, the air spring has relatively ideal non-linear elastic characteristics. After installing a height adjustment device, the vehicle body height does not change with the increase or decrease of the load, the spring stiffness can be designed to be relatively low, and the riding comfort is good. More and more assembly plants use it on passenger cars. The air spring mainly relies on the flexural movement of the bladder to adjust, and the verification of the durability of the air spring is extremely important.

[0003] Most of the existing verification tests for air springs are single-direction axial verifications, lacking the fatigue damage caused by torsion of the suspension during actual use, and the test function is single. In addition, the suspension given by customers is usually a quarter bench, and it is necessary to assemble with a companion specimen to verify the durability of the air spring. After the companion specimen is subjected to 2 to 3 durability verifications, it will be damaged and need to be repurchased for verification, which costs a high amount. It is not convenient to test the torsion and axial direction of the air spring at low cost. For this reason, we propose an axial and torsional test tooling for an air spring. Summary of the Invention

[0004] The purpose of the present invention is to provide an axial and torsional test tooling for an air spring to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An axial and torsional test tooling for an air spring, comprising:

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

[0007] A driving component, detachably installed on one side wall of the connecting seat to drive the connecting seat to twist;

[0008] A piston connecting head, arranged on the connecting seat, and an air spring to be tested is clamped between the piston connecting head and the connecting seat;

[0009] A pressure rod, fixed on the piston connecting head to drive the piston connecting head to move up and down;

[0010] Wherein, a pressure component is provided between the connecting seat and the fixed base to detect the axial pressure.

[0011] Preferably, a first pin hole matching with the upper pin rod of the air spring is opened on the lower surface of the piston connecting head, and a second pin hole is provided on the connecting seat to cooperate with the lower surface of the air spring.

[0012] Preferably, the driving assembly includes a connecting rod, a second ball joint, a connecting member and a driving structure. The connecting member is engaged with the threaded rod on one side wall of the connecting seat through a threaded portion. One end of the connecting member 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 driving structure for pushing it to move.

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

[0014] Preferably, the driving structure includes a transmission disc, a connecting shaft and a second driving shaft rod. An axial hole is formed in the inner edge of the transmission disc and is engaged with the connecting shaft on the connecting rod. The second driving shaft rod is fixed to the middle of the upper surface of the transmission disc, and one end of the second driving shaft rod is connected to a driving motor.

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

[0016] Preferably, the pressure assembly includes a support plate, a pressure sensor and a support bearing. A groove for accommodating the support bearing is formed in the fixed base, and the support plate which slides in the groove is arranged on the lower surface of the support bearing. The pressure sensor is arranged at the inner bottom end of the groove, and the upper end of the pressure sensor is in contact with the support plate.

[0017] Preferably, a first ring block is provided on the lower surface of the support plate, a second ring block which is used for guiding in cooperation with the ring cylinder is provided on the outer surface of the pressure sensor, 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 in a "T" shape.

[0019] Preferably, a hydraulic cylinder for driving the pressure rod to move up and down is connected to the pressure rod.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] The structure of the present invention is simple, and it can perform axial and torsional tests simultaneously, avoiding the situation that traditional tests can only be carried out on a single-direction axis, with a single detection function and being inconvenient for testing the fatigue damage caused by the torsion of the air spring during use. The present invention can apply different amplitudes in the axial and torsional directions, and can also achieve two-way superposition, improving the practicability. Moreover, it can test the air spring alone without the need for the suspension and accompanying test pieces provided by the customer, reducing the cost of purchasing additional accompanying test pieces and improving the use effect of the device. Description of the Drawings

[0022] Figure 1 Schematic structural diagram of the present invention;

[0023] Figure 2 Schematic cross-sectional structural diagram of the fixed base of the present invention;

[0024] Figure 3 Schematic structural diagram of the first drive shaft rod of the present invention;

[0025] Figure 4 Schematic structural diagram of the transmission disc of the present invention;

[0026] Figure 5 Schematic diagram of the torsion test of the present invention.

[0027] In the figure: 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 member; 604, first drive shaft rod; 605, first ball joint; 606, connecting shaft; 607, second drive shaft rod; 608, transmission disc; 7, support plate; 8, pressure sensor; 9, support bearing. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figures 1 - 5 , the present invention provides a technical solution: an axial and torsion test tooling for an air spring, including:

[0030] A fixed base 1, on which a connecting seat 2 is rotatably arranged;

[0031] A drive assembly 6, detachably installed on one side wall of the connecting seat 2 to drive the connecting seat 2 to twist;

[0032] It is convenient to drive the lower end of the air spring 5 to twist through the connecting seat 2, so as to perform torsion detection on the air spring 5 during axial testing or when performing torsion testing alone.

[0033] A piston connector 4, arranged on the connecting seat 2, and an air spring 5 to be tested is clamped between the piston connector 4 and the connecting seat 2;

[0034] A pressure rod 3, fixed on the piston connector 4 to drive the piston connector 4 to move up and down;

[0035] It is convenient to drive the air spring 5 to be compressed through the piston connector 4, so as to detect the durability of the air spring 5 axially.

[0036] Wherein, there is a pressure component between the connecting seat 2 and the fixed base 1 to detect the axial pressure.

[0037] It is convenient to detect the pressure received by the air spring 5 in real time during the axial detection process.

[0038] Preferably, a first pin hole matching with the upper pin rod of the air spring 5 is formed on the lower surface of the piston connector 4, and a second pin hole is provided on the connecting seat 2 to cooperate with the lower surface of the air spring 5.

[0039] It is convenient to better drive the air spring 5 to twist.

[0040] Preferably, the driving component 6 includes a connecting rod 601, a second ball joint 602, a connecting piece 603 and a driving structure. The connecting piece 603 is matched with the threaded rod 201 on one side wall of the connecting seat 2 through a threaded part. A second ball joint 602 is arranged at one end of the connecting piece 603. The connecting rod 601 is rotatably installed on the second ball joint 602, and a driving structure for pushing its movement is provided at one end of the connecting rod 601.

[0041] It is convenient to drive the connecting seat 2 to rotate, so as to drive the lower end of the air spring 5 to twist through the connecting seat 2 for detection.

[0042] Preferably, the driving structure includes a first driving shaft rod 604 and a first ball joint 605. A first ball joint 605 is provided at one end of the first driving shaft rod 604, and the first ball joint 605 is rotatably matched with the connecting rod 601. The other end of the first driving shaft rod 604 is connected with a driving cylinder.

[0043] It is convenient to drive the first driving shaft rod 604 to move back and forth linearly, so as to make the connecting seat 2 perform a rotating action.

[0044] Preferably, the driving structure includes a transmission disc 608, a connecting shaft 606 and a second driving shaft rod 607. An axial hole matching with the connecting shaft 606 on the connecting rod 601 is formed on the inner edge of the transmission disc 608. The second driving shaft rod 607 is fixed in the middle of the upper surface of the transmission disc 608, and a driving motor is connected to one end of the second driving shaft rod 607.

[0045] It is convenient to drive the second driving shaft rod 607 to rotate, so as to rotate the transmission disc 608 to change the position of the connecting shaft 606, and further push the connecting rod 601 to move, so as to push the connecting seat 2 to perform a rotating action.

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

[0047] It is convenient to better avoid the wear between the connecting shaft 606 and the transmission disc 608 and extend 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. A groove for accommodating the support bearing 9 is formed on the fixed base 1, and a support plate 7 that slides in the groove is arranged on the lower surface of the support bearing 9. The pressure sensor 8 is arranged at the inner bottom end of the groove, and the upper end of the pressure sensor 8 is in contact with the support plate 7.

[0049] It is convenient to better move the support plate 7 vertically up and down, so as to avoid the inclination of the pressure sensor 8, and further to detect the pressure in the axial compression of the air spring 5 in real time through the pressure sensor 8.

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

[0051] It is convenient for the support plate 7 to move vertically up and down better and avoid inclination.

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

[0053] Preferably, a hydraulic cylinder for driving its up and down movement is connected to the pressure rod 3.

[0054] It is convenient to better drive the pressure rod 3 to move up and down, so as to conduct a durability test on the air spring 5 axially through the piston connecting head 4.

[0055] The working principle and usage process of the present invention: When in use, place the air spring 5 between the piston connecting head 4 and the connecting seat 2. A hydraulic cylinder is connected to the pressure rod 3, and the hydraulic cylinder drives the piston connecting head 4 to move up and down through the pressure rod 3, so as to conduct a test on the axial durability of the air spring 5. A displacement sensor can be installed on the edge of the upper surface of the piston connecting head 4 to monitor the axial displacement. Further, a pressure sensor 8 is provided between the connecting seat 2 and the fixed base 1, which can detect the pressure on the air spring 5 during the axial durability test. When conducting the torsional durability test, connect a driving cylinder to one end of the first driving shaft rod 604 to drive the first driving shaft rod 604 to move back and forth, so that the first driving shaft rod 604 rotates the connecting seat 2 through the first driving shaft rod 604 and the second ball joint 602, and further drives the air spring 5 to conduct a reciprocating torsional test. When twisting, as Figure 5As shown, the first drive shaft rod 604 in the X direction moves by A, the first ball joint 605 moves by A, the second ball joint 602 moves by B, where A is not equal to B. By adding a universal joint, an angle β is generated, which avoids lateral force damage to the first drive shaft rod 604. The movement B achieves the established torsional angle α = arcsinR / B. The designed air spring torsional angle is within α ± 15 degrees. During the actual vehicle driving process, 11 degrees of α is the limit, and this designed device can achieve it. The length of the connecting rod 601 in the X direction is designed to be more than 300 mm. During the actual calculation process, B≈A. Therefore, during the calculation of the torsional angle, α≈arcsinR / A, and the angle coincidence degree is above 99%. So in this experiment, by designing different amplitudes for A on the human-machine interface, different torsional angle movements can be achieved, thus realizing torsional durability. By loading different amplitudes in the Zdir and Xdir directions and simultaneously realizing a two-way superimposed wave, a fatigue damage test of the bladder is carried out to verify the durability of the air spring, achieving the purpose of simplicity, reliability, and stability.

[0056] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An axial and torsional test tool for an air spring, characterized in that: include: A fixed base (1), wherein a connecting base (2) is rotatably provided on the fixed base (1); A driving assembly (6) is detachably mounted on a side wall of the connecting seat (2) to drive the connecting seat (2) to rotate; A piston connecting head (4) is arranged on the connecting seat (2), and an air spring (5) to be tested is clamped between the piston connecting head (4) and the connecting seat (2); A pressure rod (3) is fixed on the piston connector (4) to drive the piston connector (4) to move up and down; Wherein, a pressure component is provided between the connecting seat (2) and the fixed base (1) to detect axial pressure.

2. The axial and torsional test fixture for an air spring according to claim 1, characterized in that: The lower surface of the piston connecting head (4) is provided with a first pin hole which matches with the pin rod on the air spring (5), and the connecting seat (2) is provided with a second pin hole which matches with the lower surface of the air spring (5).

3. The axial and torsional test fixture for an air spring according to claim 1, characterized in that: The driving assembly (6) comprises a connecting rod (601), a second ball joint (602), a connecting piece (603) and a driving structure. The connecting piece (603) cooperates with a threaded rod (201) on a side wall of the connecting seat (2) via a threaded portion. One end of the connecting piece (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 driving structure for driving it to move.

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

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

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

7. The axial and torsional test fixture for an air spring according to claim 1, characterized in that: The pressure assembly comprises a support plate (7), a pressure sensor (8) and a support bearing (9); a groove for accommodating the support bearing (9) is provided on the fixed base (1), and a support plate (7) sliding in the groove is provided on the lower surface of the support bearing (9); the pressure sensor (8) is provided at the bottom end of the inner side 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 test 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, the outer surface of the pressure sensor (8) has a second ring block that cooperates with the ring tube 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 test fixture for an air spring according to claim 1, characterized in that: The cross section of the fixed base (1) is in a "T" shape.

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

Images