Multi-axial fatigue test device for bushing

Abstract

The utility model relates to the technical field of test equipment, and discloses a multi-axial fatigue test device for bushings, which comprises a multi-dimensional swing rod part and a rotary clamping part, the multi-dimensional swing rod part is connected with the rotary clamping part, the rotary clamping part comprises a support part and a rotary clamp, and the support part is connected with the rotary clamp. The supporting component comprises first side plates oppositely arranged on the base, the base and the first side plates form a containing cavity to contain the bearing unit, and a clamping fixture is arranged in the bearing unit. The bearing unit comprises a bottom support, second side plates arranged on the two sides of the bottom support and a semi-closed frame defined by a transition connecting plate connected with the second side plates. The torsion dynamic load actuator is arranged on the outer side wall of the transition connecting plate and used for loading; a first connecting plate and a second connecting plate are arranged in the second side plate, the first connecting plate is transversely arranged on the outer side of the clamping fixture, the second connecting plate is vertically arranged on the outer side of the clamping fixture, and an axial dynamic load actuator used for loading radial force is installed on the second connecting plate.

Description

Technical Field

[0001] This utility model relates to a multiaxial fatigue testing device for bushings, belonging to the technical field of testing equipment. Background Technology

[0002] Bushings are common components in automotive chassis and typically withstand radial, axial, yawing, and torsional loads. To ensure product lifespan and reliability, fatigue reliability verification is conducted in a laboratory during the development process, based on actual loads and deformation conditions.

[0003] Depending on the importance and technical characteristics of the project and product, fatigue performance in one main direction can be verified separately, or it may be required to verify fatigue performance in multiple directions simultaneously. Existing testing equipment often requires connecting multiple actuators to the same fixture to perform multi-directional composite loading on the same product, resulting in complex testing equipment and inconsistent testing accuracy.

[0004] A search revealed that patent 202220400502.3 discloses a multi-directional composite fatigue tooling, comprising a support, a loading frame, a clamping ring assembly, a first actuator for applying radial force, and a second actuator for driving the loading frame to swing and apply torsional motion. The loading frame is rotatably connected to the support, and the clamping ring assembly is disposed on the loading frame. In use, the bushing is installed inside the clamping ring assembly, and the first actuator is connected to the inner sleeve of the bushing. This allows for the application of radial force while restricting the inner sleeve's degree of freedom in the torsional direction. The second actuator drives the loading frame to swing back and forth. The clamping ring assembly moves with the loading frame, and the outer sleeve of the bushing moves with the clamping ring assembly, thereby causing the outer sleeve of the bushing to torsion relative to the inner sleeve. This results in good structural stability and is suitable for radial and torsional composite fatigue loading of products such as automotive bushings and ball joints in rail transit vehicles.

[0005] The aforementioned patent describes biaxial composite fatigue testing using two linearly actuated cylinders. It can only be tested in two directions: radial (X) static load and torsional (Rz) dynamic load, and is not applicable to quadriaxial composite fatigue testing.

[0006] Therefore, inventing a multi-axis fatigue testing device with more directions is of great significance and economic value to actual production. Utility Model Content

[0007] To address the shortcomings of the prior art, this invention provides a multiaxial fatigue testing device for bushings, which can simultaneously perform fatigue testing in four directions: radial (X) static load + radial (Y) dynamic load + axial (Z) dynamic load + torsional (Rz) dynamic load; the torsional testing function is achieved through a linear actuator, which is easy to install and has high reliability in testing.

[0008] The technical means adopted by this utility model to solve the above problems are as follows:

[0009] A multiaxial fatigue testing device for bushings is disclosed, comprising a multidimensional pendulum component and a rotating clamping component. The multidimensional pendulum component is connected to the rotating clamping component and is used to transmit power to the rotating clamping component to provide radial, axial, and torsional loads for the bushing to be tested installed inside the rotating clamping component. The rotating clamping component includes a support component and a rotating fixture. The support component includes a first side plate disposed opposite to a base. The base and the first side plate form a receiving cavity to accommodate a bearing unit. The bearing unit is equipped with a clamping fixture inside. The bearing unit includes a bottom support, a second side plate disposed on both sides of the bottom support, and a semi-enclosed frame enclosed by a transition connecting plate connecting the second side plate. A torsional dynamic load actuator for loading is mounted on the outer wall of the transition connecting plate. The second side plate is provided with a first connecting plate and a second connecting plate inside. The first connecting plate is disposed laterally outside the clamping fixture, and the second connecting plate is disposed vertically outside the clamping fixture. An axial dynamic load actuator for loading radial force is mounted on the second connecting plate.

[0010] The multiaxial fatigue testing device for bushings of this invention effectively sets up a multidimensional pendulum component and a rotating clamping component. The axial dynamic load actuator and the torsional dynamic load actuator are respectively placed on the first connecting plate and the second connecting plate, which can apply loads from different sides to simulate actual working conditions. Furthermore, using a linear actuator, the rotating clamp is driven to rotate and swing through the pendulum and the pendulum arm, thereby driving the bushing outer tube to rotate and swing, realizing the Rz dynamic load.

[0011] Furthermore, the clamping fixture is a segmented housing to be fixed to the outside of the bushing to be tested. The outer sleeve of the bushing is embedded in and firmly connected to a rotatable clamping fixture, with the axis of the bushing and the rotation center of the rotatable fixture coinciding; this ensures that the entire bushing to be tested is subjected to uniform force, thus improving the accuracy of the test results.

[0012] Furthermore, a radial actuator is laterally connected to the first connecting plate; the radial actuator is perpendicular to the axial dynamic load actuator. The radial actuator is a linear actuator connected to the inner sleeve of the bushing via a rocker arm along the Y-axis to achieve dynamic load in the Y direction. Furthermore, concentric through holes are formed on side plates one and two to fix the first and second connecting plates via the radial dynamic load actuator. This design effectively connects the first and second connecting plates, makes efficient use of space, and increases the overall reliability of the equipment.

[0013] Furthermore, the torsional dynamic load actuator and the axial dynamic load actuator are mounted on two independently configured frame components. This design ensures that the actuators in different directions do not interfere with each other.

[0014] Furthermore, the outer wall of the transition connecting plate is an L-shaped bearing arm extending outward from the bottom support. One end of the torsional dynamic load actuator is connected to the top of the L-shaped bearing arm, and the other end is installed at the output end of the drive motor. Through the swing rod and swing arm, the rotating clamp is driven to rotate and swing, thereby driving the bushing outer tube to rotate and swing, realizing the Rz dynamic load.

[0015] Furthermore, the drive motor is mounted on a horizontally arranged frame component one, a ball joint one is installed between the drive motor and the torsional load actuator, and a ball joint two is installed between the torsional load actuator and the L-shaped bearing arm, so as to realize the torsional load actuator driving the rotation clamp to rotate.

[0016] Furthermore, one end of the axial dynamic load actuator is fixedly connected to the second connecting plate, and the other end is connected to the linear bearing and the linear shaft through a ball joint.

[0017] Furthermore, the top ends of the linear bearing and linear shaft are fixed to frame component two, and a spring preload device is provided at the bottom of frame component two. The spring preload device passes through frame component two and is positioned on both sides of the linear bearing and linear shaft. The top of the spring preload device is fixed to the crossbeam. The crossbeam is arranged parallel to frame component two. Frame component two and frame component one are staggered and have different vertical heights. The X-direction constant load is achieved by providing a constant load through a set of spring preload devices. Multi-directional decoupling is achieved through a ball joint and rocker arm structure. The linear shaft is connected to the inner sleeve of the bushing through the rocker arm, applying the constant pressure of the spring to the bushing. Preferably, the stiffness of the spring preload device is less than the Z-direction stiffness of the bushing.

[0018] Furthermore, a force sensor is installed between the linear bearing and the linear shaft and the ball joint. A force sensor is connected in series with the spring preload device to visualize the accuracy of the applied load.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] The multiaxial fatigue testing device for bushings of this invention effectively sets up a multidimensional pendulum component and a rotating clamping component. The axial dynamic load actuator and the torsional dynamic load actuator are respectively placed on the first connecting plate and the second connecting plate, so that loads can be applied from different sides to simulate actual working conditions. Furthermore, using a linear actuator, the rotating clamp is driven to rotate and swing through the pendulum and the pendulum arm, thereby driving the bushing outer tube to rotate and swing, realizing the Rz dynamic load.

[0021] It can simultaneously perform fatigue tests in four directions: radial (X) static load + radial (Y) dynamic load + axial (Z) dynamic load + torsional (Rz) dynamic load; the torsional test verification function is realized through a linear actuator, which is easy to install and has high reliability in test verification.

[0022] The multiaxial fatigue testing device for bushings of this invention uses a spring preload device to apply a constant load and uses sensors for visualization, which makes the entire testing process highly controllable and ensures testing accuracy. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0024] Figure 1 This is a schematic diagram of the overall structure of the multiaxial fatigue testing device for bushings described in this utility model.

[0025] Figure 2 for Figure 1 Another view of the overall structural schematic diagram of the multiaxial fatigue testing device for bushings.

[0026] Figure 3 This is a schematic diagram of the rotating fixture of the multiaxial fatigue testing device for bushings described in this utility model.

[0027] Among them, 1-support component, 11-base, 12-side plate one, 2-rotating clamp, 3-bearing unit, 31-bottom bracket, 32-side plate two, 33-connecting plate, 34-L-shaped bearing arm, 4-clamping fixture, 5-torsional dynamic load actuator, 51-ball joint one, 52-ball joint two, 6-axial dynamic load actuator, 61-first connecting plate, 62-second connecting plate, 63-linear bearing and linear shaft, 64-ball joint, 65-force sensor, 7-radial actuator, 8-radial dynamic load actuator, 9-drive motor, 100-frame component one, 200-frame component two, 300-spring preload device, 400-crossbeam. Detailed Implementation

[0028] The present invention will be further described below with reference to the embodiments, but the scope of protection of the present invention is not limited thereto. Example 1

[0029] like Figures 1-3 As shown, the multiaxial fatigue testing device for bushings in this embodiment includes a multidimensional pendulum component and a rotating clamping component. The multidimensional pendulum component is connected to the rotating clamping component and is used to transmit power to the rotating clamping component to provide radial, axial, and torsional loads for the bushing to be tested installed inside the rotating clamping component.

[0030] Specifically, the multi-dimensional pendulum component is preferably a linear actuator, which includes a pendulum rod and a pendulum arm connected to the outside of the rotary clamping component. The multi-dimensional pendulum component is connected at different parts of the rotary clamping component to achieve loading in different directions. In this embodiment, the rotary clamping component includes a support component 1 and a rotary clamp 2 (including a bearing unit 3 and a clamping clamp 4). The support component 1 includes a side plate 12 disposed opposite to the base 11. The base 11 and the side plate 12 form a receiving chamber to accommodate the bearing unit 3. For the purpose of weight reduction, a weight-reducing hole can be provided in the center of the base 11, and a centrally symmetrical groove can be provided at the bottom. It should be noted that in order to ensure the stability of the entire base 11 and the uniform force on the bushing to be tested, the weight-reducing hole or groove is preferably symmetrically arranged.

[0031] The bearing unit 3 is equipped with a clamping fixture 4, which is a split shell to be fixed to the outside of the bushing to be tested. The outer sleeve of the bushing is embedded in a rotatable clamping fixture 4 and is firmly connected to it. The axis of the bushing and the rotation center of the clamping fixture 4 coincide.

[0032] The load-bearing unit 3 in this embodiment includes a bottom support 31, side plates 32 disposed on both sides of the bottom support 31, and a transition connecting plate 33 connecting the side plates 32, forming a semi-enclosed frame. A torsional dynamic load actuator 5 for loading is mounted on the outer wall of the transition connecting plate 33. The outer wall of the transition connecting plate 33 is an L-shaped load-bearing arm 34 extending outward from the bottom support 31. One end of the torsional dynamic load actuator 5 is connected to the top of the L-shaped load-bearing arm 34, and the other end is mounted on the output end of the drive motor 9. The torsional dynamic load actuator 5 is a linear actuator that drives the rotating clamp 2 to rotate and swing through a swing rod and swing arm, thereby causing the bushing outer tube to rotate and swing, achieving Rz dynamic load.

[0033] Side plate 32 has a first connecting plate 61 and a second connecting plate 62 inside. The first connecting plate 61 is horizontally positioned outside the clamping fixture 4, and the second connecting plate 62 is vertically positioned outside the clamping fixture 4. An axial dynamic load actuator 6 for applying radial force is mounted on the second connecting plate 62. A radial actuator 7 is horizontally connected to the first connecting plate 61; the radial actuator 7 is perpendicular to the axial dynamic load actuator 6. The torsional dynamic load actuator 5 and the axial dynamic load actuator 6 are respectively mounted on two independently set frame components. The axial dynamic load actuator 6 is a linear actuator, connected to the inner sleeve of the bushing along the Z-axis via a rocker arm to achieve Z-axis dynamic load. The radial actuator 7 is a linear actuator, connected to the inner sleeve of the bushing along the Y-axis via a rocker arm to achieve Y-axis dynamic load.

[0034] Concentric through holes 35 are provided on side plate 12 and side plate 32 to fix the first connecting plate 61 and the second connecting plate 62 through the radial dynamic load actuator 8. This design can effectively connect the first connecting plate 61 and the second connecting plate 62, make efficient use of space, and increase the reliability of the entire equipment.

[0035] Specifically, the drive motor 9 is mounted on the horizontally arranged frame component 100, and a ball joint 51 is installed between the drive motor 9 and the torsional load actuator 5. A ball joint 52 is installed between the torsional load actuator 5 and the L-shaped bearing arm 34, so as to realize the torsional load actuator 5 driving the rotating clamp 2 to rotate.

[0036] One end of the axial dynamic load actuator 6 is fixedly connected to the second connecting plate 62, and the other end is connected to the linear bearing and linear shaft 63 through a ball joint 64.

[0037] The top of the linear bearing and linear shaft 63 is fixed to the frame component 200. A spring preload device 300 is installed at the bottom of the frame component 200. The spring preload device 300 passes through the frame component 200 and is positioned on both sides of the linear bearing and linear shaft 63. The top of the spring preload device 300 is fixed to the crossbeam 400. The crossbeam 400 is arranged parallel to the frame component 200. The frame component 200 and the frame component 100 are staggered and do not interfere with each other, with different vertical heights. A force sensor 65 is installed between the linear bearing and linear shaft 63 and the ball joint 64.

[0038] The X-direction constant load is achieved by providing a constant load through a set of spring preload devices 300. Multi-directional decoupling is achieved through a ball joint 64 and a rocker arm structure. A linear bearing and linear shaft 63 are connected to the inner bushing via the rocker arm, applying a constant spring pressure to the bushing. Preferably, the stiffness of the spring preload device 300 is less than the Z-direction stiffness of the bushing.

[0039] The multiaxial fatigue testing device for bushings of this invention uses a spring preload device to apply a constant load and uses sensors for visualization, which makes the entire testing process highly controllable and ensures testing accuracy.

[0040] Those skilled in the art can make various changes or modifications without departing from the spirit and scope of this utility model. Therefore, all equivalent technical solutions should also fall within the protection scope of this utility model, which should be defined by the claims.

Claims

1. A multi-axial fatigue test device for bushings, characterized by The utility model discloses a multi-dimensional swing lever component and a rotary clamping component, the multi-dimensional swing lever component is connected with the rotary clamping component, is used for transmitting power to the rotary clamping component, provides load for the radial, axial, torsion of the bushing to be detected installed in the rotary clamping component; The rotary clamping component includes support component (1) and rotary clamp (2), the support component (1) includes opposite side plate one (12) on base (11), the base (11) forms the containing chamber with side plate one (12), to accommodate bearing unit (3), the bearing unit (3) is provided with clamping clamp (4) inside, the bearing unit (3) includes bottom support (31), the side plate two (32) of setting in bottom support (31) both sides and the semi-enclosed frame of transition connecting plate (33) connected side plate two (32) surrounds, the outside wall of transition connecting plate (33) is used for loading torsional dynamic load actuator (5), the inside of side plate two (32) is equipped with first connecting plate (61) and second connecting plate (62), the first connecting plate (61) is transversely arranged outside clamping clamp (4), the second connecting plate (62) is vertically arranged outside clamping clamp (4), and the second connecting plate (62) is installed with axial dynamic load actuator (6) for loading radial force.

2. The multi-axial fatigue test apparatus for bushings according to claim 1, wherein The clamping clamp (4) is a split type shell, to be fixed to the outside of the bushing to be detected.

3. The multi-axial fatigue test apparatus for bushings according to claim 2, wherein The first connecting plate (61) is transversely connected with radial actuator (7), and the radial actuator (7) is vertically arranged with the axial dynamic load actuator (6).

4. The multi-axial fatigue test apparatus for bushings according to claim 3, wherein The side plate one (12) and the side plate two (32) are provided with concentric through holes (35) to fix the first connecting plate (61) and the second connecting plate (62) through the radial dynamic load actuator (8).

5. The multi-axial fatigue test apparatus for bushings according to any one of claims 1 to 4, characterized in that, The torsional dynamic load actuator (5) and the axial dynamic load actuator (6) are respectively installed on two independently arranged frame components.

6. The multi-axial fatigue test apparatus for bushings according to claim 5, wherein The outside wall of the transition connecting plate (33) is an L-shaped bearing arm (34) extending outward from the bottom support (31), one end of the torsional dynamic load actuator (5) is connected to the top end of the L-shaped bearing arm (34), and the other end is installed on the output end of the driving motor (9).

7. The multi-axial fatigue test apparatus for bushings according to claim 6, wherein The driving motor (9) is installed on the horizontally arranged frame component one (100), a ball hinge joint one (51) is installed between the driving motor (9) and the torsional dynamic load actuator (5), a ball hinge joint two (52) is installed between the torsional dynamic load actuator (5) and the L-shaped bearing arm (34), so as to realize the torsion of the rotary clamp (2) driven by the torsional dynamic load actuator (5).

8. The multi-axial fatigue test apparatus for bushings according to claim 7, wherein One end of the axial dynamic load actuator (6) is fixedly connected with the second connecting plate (62), and the other end is connected with a linear bearing and a linear shaft (63) through a ball joint (64).

9. The multi-axial fatigue test apparatus for bushings according to claim 8, wherein The top end of the linear bearing and linear shaft (63) is fixed on the frame component two (200), the bottom of the frame component two (200) is provided with spring preloading device (300), the spring preloading device (300) is arranged on both sides of the linear bearing and linear shaft (63) through the frame component two (200), and the top of the spring preloading device (300) is fixed with the crossbeam (400); the crossbeam (400) is arranged in parallel with the frame component two (200); the frame component two (200) is arranged staggered with the frame component one (100), and the vertical heights are different.

10. The multi-axial fatigue test apparatus for bushings according to claim 9, wherein The force sensor (65) is arranged between the linear bearing and linear shaft (63) and the ball joint (64).

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