Triaxial testing device for reproducing abnormal sound of air spring

Abstract

The utility model discloses a triaxial testing device for reproducing abnormal sound of an air spring, which consists of an axial torsion tool comprising a torsion cylinder and a lower workpiece fixing frame, an axial linear force tool comprising an axial linear cylinder and an upper workpiece fixing frame, and a radial linear force tool comprising a radial linear cylinder, a piston rod of the torsion cylinder faces upwards and is connected with the lower workpiece fixing frame, the axial linear cylinder is vertically installed, a piston rod of the axial linear cylinder faces upwards and is connected with the upper workpiece fixing frame, an air chamber of the air spring is limited on the upper workpiece fixing frame during testing, a shock absorber of the air spring is limited on the lower workpiece fixing frame, and the axial direction of the air spring is consistent with the vertical direction. A piston rod of the radial linear cylinder pushes the torsion cylinder to linearly move back and forth along the radial direction of the air spring; the device has the advantages that radial linear force and axial linear force are added on the basis of testing axial torsion to realize simultaneous loading of forces in three directions, the real vehicle condition of the air spring can be well simulated, and the abnormal sound condition of the air spring can be reproduced.

Description

Technical Field

[0001] The utility model relates to a scheme for reproducing the abnormal sound of an empty spring, in particular to a three-axis testing device for reproducing the abnormal sound of an empty spring. Background Art

[0002] Since the birth of the car, its excellent function of transportation has made an irreplaceable contribution to the rapid development of human society. Nowadays, my country's social economy has been developing rapidly. People are no longer satisfied with the transportation function of cars, but have begun to pay more and more attention to ride comfort and driving safety. Air springs (referred to as air springs) are a new type of elastic element for automobile suspension. Their excellent vibration reduction performance and controllability are favored by various automobile manufacturers. Their main working principle is to change the cross-sectional area of ​​the piston or the volume of the air chamber to change the stiffness of the air spring, thereby changing the handling stability and smoothness of the car to achieve the purpose of ride comfort and driving safety.

[0003] Air springs are usually mainly composed of shock absorbers, pistons, and air chambers. When the air spring is working, the air chamber is filled with compressed air to form a compressed air column. As the vibration load increases, the height of the air spring decreases, the volume of the air chamber decreases, the stiffness of the air spring increases, and the effective bearing area of ​​the compressed air column in the air chamber increases. At this time, the bearing capacity of the air spring increases. If an abnormal noise occurs in the actual operation of the air spring, it is necessary to use a scheme that simulates the actual vehicle conditions of the empty spring to reproduce the abnormal noise of the empty spring to study the cause of the abnormal noise, so as to determine which component of the air spring causes the abnormal noise, so that the corresponding component can be further improved. There are many reasons for the abnormal noise of the air spring. For example, if the air spring leaks or ruptures, the vibration reduction effect will decrease, resulting in abnormal noise; for example, if the shock absorber fails, the vibration of the car cannot be effectively absorbed, resulting in abnormal noise.

[0004] At present, the commonly used solution to reproduce the abnormal noise of empty springs is single-axis loading, which cannot simulate the actual situation of an empty spring vehicle well. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a three-axis testing device for reproducing the abnormal noise of empty springs. On the basis of testing axial torsion, radial linear force and axial linear force are added to realize simultaneous loading of forces in three directions, which can well simulate the actual vehicle situation of empty springs to reproduce the abnormal noise of empty springs.

[0006] The technical solution adopted by the utility model to solve the above-mentioned technical problems is: a three-axis testing device for reproducing the abnormal sound of an empty spring, characterized in that: the device is composed of an axial torsion tooling, an axial linear force tooling, and a radial linear force tooling, the axial torsion tooling includes a torsion cylinder and a lower workpiece fixing frame, the axial linear force tooling includes an axial linear cylinder and an upper workpiece fixing frame, the radial linear force tooling includes a radial linear cylinder, the torsion cylinder is vertically installed, the piston rod of the torsion cylinder is upward and connected to the lower workpiece fixing frame, the axial linear cylinder is vertically installed, the piston rod of the axial linear cylinder is upward and connected to the upper workpiece fixing frame, during testing, the air chamber of the empty spring is limited to the upper workpiece fixing frame, the shock absorber of the empty spring is limited to the lower workpiece fixing frame, so that the axial direction of the empty spring is consistent with the vertical direction, the radial linear cylinder is horizontally installed, and the piston rod of the radial linear cylinder pushes the torsion cylinder to move back and forth along the radial straight line of the empty spring.

[0007] The device is equipped with a platform and an iron floor. The iron floor is laid on the upper surface of the platform, and the axial torsion tooling, the axial linear force tooling and the radial linear force tooling are installed on the iron floor.

[0008] The axial torsion fixture also includes a torsion fixture fixing frame, which is composed of a fixing seat and a bottom plate. The torsion cylinder is vertically mounted on the fixing seat, and the bottom plate is mounted on the iron floor. A linear guide pair is arranged between the bottom of the fixing seat and the top of the bottom plate, and the piston rod of the radial linear cylinder is connected to the fixing seat. In this structure, the torsion fixture fixing frame provides support and fixation for the torsion cylinder; the linear guide pair is used to make the fixing seat move back and forth on the bottom plate under the push-pull force; and the loading of the radial linear force is realized by loading the fixing seat.

[0009] A force release mechanism is provided between the piston rod of the radial linear cylinder and the fixing seat for releasing the force when the loading forces in three directions are tested simultaneously. If the piston rod of the radial linear cylinder is directly hard-connected to the fixing seat, the force cannot be released when the loading forces in three directions are tested simultaneously.

[0010] The force release mechanism includes a ball joint bearing connecting rod and two connecting seats, wherein the joint bearing at one end of the ball joint bearing connecting rod is connected to the inner end of the first connecting seat through a shaft, and the outer end of the first connecting seat is connected to the piston rod of the radial linear cylinder, and the joint bearing at the other end of the ball joint bearing connecting rod is connected to the inner end of the second connecting seat through a shaft, and the outer end of the second connecting seat is connected to the fixed seat. In this structure, the ball joint bearing connecting rod is used to realize the release of force when testing the loading forces in three directions at the same time, and the structure is simple and easy to implement.

[0011] The axial linear force tooling also includes a gantry, the axial linear cylinder is vertically mounted on the top of the gantry, and the bottom of the gantry is fixed on the iron floor. In this structure, the gantry provides support and fixation for the axial linear cylinder, and since the cylinder body of the axial linear cylinder is located in the space below the top of the gantry, the height of the axial linear force tooling is reduced.

[0012] The radial linear force fixture also includes a linear force fixture fixing frame, the radial linear cylinder is horizontally mounted on the linear force fixture fixing frame, and the linear force fixture fixing frame is mounted on the iron floor. In this structure, the linear force fixture fixing frame provides support and fixation for the radial linear cylinder.

[0013] A clamp for clamping the shock absorber of the empty spring is arranged on the lower fixing frame of the workpiece. Since the shock absorber end of the empty spring has no fixed position and the radial cross-section of the shock absorber is small, the clamp is used to clamp the shock absorber to stabilize the lower part of the empty spring.

[0014] The workpiece upper fixing frame is in a Z shape, the high position side of the workpiece upper fixing frame is connected to the piston rod of the axial linear cylinder, and the low position side of the workpiece upper fixing frame is used to connect to the air chamber of the air spring. When testing air springs of different axial heights, workpiece upper fixing frames of different heights can be replaced; the air chamber of the air spring and the piston rod of the axial linear cylinder are connected through the workpiece upper fixing frame to load the axial linear force.

[0015] The torsion cylinder, the radial linear cylinder, and the axial linear cylinder are electric cylinders or pneumatic cylinders, and the electric cylinder or pneumatic cylinder can be selected according to the actual working environment.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] 1) By setting up the axial torsion fixture, axial linear force fixture, and radial linear force fixture, radial linear force and axial linear force are added on the basis of testing the axial torsion to achieve simultaneous loading of forces in three directions. This method can well simulate the actual situation of an empty spring vehicle and reproduce the abnormal noise of the empty spring.

[0018] 2) The axial torsion and the axial linear force are hard-connected, and the force is applied by the air spring itself; the axial torsion and the radial linear force are unloaded through the ball joint bearing connecting rod connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The overall three-dimensional structure of the triaxial testing device of the utility model is shown in FIG. Figure 1 ;

[0020] Figure 2The overall three-dimensional structure of the triaxial testing device of the utility model is shown in FIG. Figure 2 ;

[0021] Figure 3 It is a front view of the triaxial testing device of the utility model;

[0022] Figure 4 It is a side view of the triaxial testing device of the utility model;

[0023] Figure 5 It is a partial structural schematic diagram of the triaxial testing device of the utility model;

[0024] Figure 6 for Figure 5 Enlarged schematic diagram of part A. DETAILED DESCRIPTION

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] The utility model proposes a triaxial testing device for reproducing the abnormal sound of an empty spring. As shown in the figure, the device consists of a platform 1, an iron floor 2, an axial torsion tool 3, an axial linear force tool 4, and a radial linear force tool 5. The iron floor 2 is laid on the upper surface of the platform 1, and the axial torsion tool 3, the axial linear force tool 4, and the radial linear force tool 5 are installed on the iron floor 2. The axial torsion tool 3 includes a torsion cylinder 31 and a lower fixing frame 32 for the workpiece, the axial linear force tool 4 includes an axial linear cylinder 41 and an upper fixing frame 42 for the workpiece, and the radial linear force tool 5 includes The radial linear cylinder 51 and the torsion cylinder 31 are installed vertically, and the piston rod of the torsion cylinder 31 faces upward and is connected to the lower fixing frame 32 of the workpiece. The axial linear cylinder 41 is installed vertically, and the piston rod of the axial linear cylinder 41 faces upward and is connected to the upper fixing frame 42 of the workpiece. During the test, the air chamber of the empty spring (not shown in the figure) is limited to the upper fixing frame 42 of the workpiece, and the shock absorber of the empty spring is limited to the lower fixing frame 32 of the workpiece, so that the axial direction of the empty spring is consistent with the vertical direction. The radial linear cylinder 51 is installed horizontally, and the piston rod of the radial linear cylinder 51 pushes the torsion cylinder 31 to move back and forth along the radial straight line of the empty spring. By setting the axial torsion tooling 3, the axial linear force tooling 4, and the radial linear force tooling 5, the radial linear force and the axial linear force are added on the basis of the axial torsion test to achieve simultaneous loading of the three directional forces. This method can well simulate the actual vehicle situation of the empty spring and reproduce the abnormal sound of the empty spring.

[0027] In a preferred embodiment, the axial torsion tooling 3 also includes a torsion tooling fixing frame 33, which is composed of a fixing seat 331 and a base plate 332. The torsion cylinder 31 is vertically mounted on the fixing seat 331, and the base plate 332 is mounted on the iron floor 2. A linear guide pair 333 is arranged between the bottom of the fixing seat 331 and the top of the base plate 332. A force release mechanism 6 for releasing force when simultaneously testing the loading forces in three directions is arranged between the piston rod of the radial linear cylinder 51 and the fixing seat 331. The force release mechanism 6 includes a ball joint bearing connecting rod 61 and two connecting seats 62. The joint bearing 611 at one end of the ball joint bearing connecting rod 61 is connected to the inner end of the first connecting seat 62 through the shaft 621, and the outer end of the first connecting seat 62 is connected to the piston rod of the radial linear cylinder 51. The joint bearing 611 at the other end of the ball joint bearing connecting rod 61 is connected to the inner end of the second connecting seat 62 through the shaft 621, and the outer end of the second connecting seat 62 is connected to the fixing seat 331. The axial linear force tooling 4 also includes a gantry 43, the axial linear cylinder 41 is vertically mounted on the top of the gantry 43, and the bottom of the gantry 43 is fixed on the iron floor 2. The radial linear force tooling 5 also includes a linear force tooling fixing frame 52, the radial linear cylinder 51 is horizontally mounted on the linear force tooling fixing frame 52, and the linear force tooling fixing frame 52 is mounted on the iron floor 2. In this structure, the torsion fixture fixing frame 33 provides support and fixation for the torsion cylinder 31; the linear guide pair 333 is used to make the fixing seat 331 move back and forth on the bottom plate 332 under the push-pull force; the radial linear force is loaded by loading the fixing seat 331; if the piston rod of the radial linear cylinder 51 is directly hard-connected with the fixing seat 331, it is impossible to unload the force when testing the loading forces in three directions at the same time; the ball joint bearing connecting rod 61 is used to realize the release of the force when testing the loading forces in three directions at the same time, and the structure is simple and easy to implement; the gantry 43 provides support and fixation for the axial linear cylinder 41. Since the cylinder body of the axial linear cylinder 41 is located in the space below the top of the gantry 43, the height of the axial linear force fixture 4 is reduced; the linear force fixture fixing frame 52 provides support and fixation for the radial linear cylinder 51. The axial torsion and the axial linear force are hard-connected, and the force is applied by the air spring itself; the axial torsion and the radial linear force are connected by the ball joint bearing connecting rod 61 to complete the unloading.

[0028] In another preferred embodiment, a clamp 321 for clamping the shock absorber of the empty spring is provided on the lower fixing frame 32 of the workpiece. Since the shock absorber end of the empty spring has no fixed position and the radial cross-section of the shock absorber is small, the clamp 321 is used to clamp the shock absorber to stabilize the lower part of the empty spring; the upper fixing frame 42 of the workpiece is Z-shaped, and the high-position edge 421 of the upper fixing frame 42 of the workpiece is connected to the piston rod of the axial linear cylinder 41, and the low-position edge 422 of the upper fixing frame 42 of the workpiece is used to connect with the air chamber of the empty spring. When testing empty springs of different axial heights, the upper fixing frames 42 of the workpiece can be replaced with different heights; the air chamber of the empty spring and the piston rod of the axial linear cylinder 41 are connected through the upper fixing frame 42 of the workpiece to load the axial linear force.

[0029] In each of the above solutions, the torsion cylinder 31, the radial linear cylinder 51, and the axial linear cylinder 41 are electric cylinders or pneumatic cylinders, and the use of electric cylinders or pneumatic cylinders can be selected according to the actual working environment.

Claims

1. A three-axis test device for reproducing the abnormal sound of an empty spring, characterized in that: The device is composed of an axial torsion tooling, an axial linear force tooling, and a radial linear force tooling. The axial torsion tooling includes a torsion cylinder and a lower workpiece fixing frame. The axial linear force tooling includes an axial linear cylinder and an upper workpiece fixing frame. The radial linear force tooling includes a radial linear cylinder. The torsion cylinder is vertically installed, and the piston rod of the torsion cylinder faces upward and is connected to the lower workpiece fixing frame. The axial linear cylinder is vertically installed, and the piston rod of the axial linear cylinder faces upward and is connected to the upper workpiece fixing frame. During testing, the air chamber of the air spring is limited to the upper workpiece fixing frame, and the shock absorber of the air spring is limited to the lower workpiece fixing frame, so that the axial direction of the air spring is consistent with the vertical direction. The radial linear cylinder is horizontally installed, and the piston rod of the radial linear cylinder pushes the torsion cylinder to move back and forth along the radial line of the air spring.

2. The triaxial testing device for reproducing the abnormal sound of an empty spring according to claim 1, characterized in that: The device is equipped with a platform and an iron floor. The iron floor is laid on the upper surface of the platform, and the axial torsion tooling, the axial linear force tooling and the radial linear force tooling are installed on the iron floor.

3. The triaxial testing device for reproducing the abnormal sound of an empty spring according to claim 2, characterized in that: The axial torsion tooling also includes a torsion tooling fixing frame, which is composed of a fixing seat and a base plate. The torsion cylinder is vertically installed on the fixing seat, and the base plate is installed on the iron floor. A linear guide pair is arranged between the bottom of the fixing seat and the top of the base plate, and the piston rod of the radial linear cylinder is connected to the fixing seat.

4. The triaxial testing device for reproducing the abnormal sound of an empty spring according to claim 3, characterized in that: A force release mechanism is provided between the piston rod of the radial linear cylinder and the fixing seat for releasing force when the loading forces in three directions are tested simultaneously.

5. The triaxial testing device for reproducing the abnormal sound of an empty spring according to claim 4, characterized in that: The force release mechanism includes a ball joint bearing connecting rod and two connecting seats, the joint bearing at one end of the ball joint bearing connecting rod is connected to the inner end of the first connecting seat through an axis, the outer end of the first connecting seat is connected to the piston rod of the radial linear cylinder, the joint bearing at the other end of the ball joint bearing connecting rod is connected to the inner end of the second connecting seat through an axis, and the outer end of the second connecting seat is connected to the fixed seat.

6. The triaxial testing device for reproducing the abnormal sound of an empty spring according to claim 2, characterized in that: The axial linear force tooling also includes a gantry, the axial linear cylinder is vertically installed on the top of the gantry, and the bottom of the gantry is fixed on the iron floor.

7. The triaxial testing device for reproducing the abnormal sound of an empty spring according to claim 2, characterized in that: The radial linear force tooling also includes a linear force tooling fixing frame, the radial linear cylinder is horizontally installed on the linear force tooling fixing frame, and the linear force tooling fixing frame is installed on the iron floor.

8. The triaxial testing device for reproducing the abnormal sound of an empty spring according to any one of claims 1 to 7, characterized in that: A clamp for clamping the shock absorber of the air spring is arranged on the lower fixing frame of the workpiece.

9. The triaxial testing device for reproducing the abnormal sound of an empty spring according to claim 8, characterized in that: The workpiece upper fixing frame is Z-shaped, the high position side of the workpiece upper fixing frame is connected to the piston rod of the axial linear cylinder, and the low position side of the workpiece upper fixing frame is used to connect to the air chamber of the air spring.

10. The triaxial testing device for reproducing the abnormal sound of an empty spring according to claim 1, characterized in that: The torsion cylinder, the radial linear cylinder and the axial linear cylinder are electric cylinders or pneumatic cylinders.

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