A new type of heavy-duty frame bending and torsional fatigue test bench

Abstract

This utility model provides a novel bending and torsional fatigue testing bench for heavy-duty vehicle frames, relating to the field of automotive testing technology. It includes a platform, a front fixture, and a rear fixture. The front fixture comprises a front fixture bracket and a front fixture mounting base, the bracket being detachably connected to the mounting base via a pin. The rear fixture comprises a rear fixture bracket and a rear fixture mounting base, the bracket being detachably connected to the mounting base via a pin. Both the front and rear fixture brackets have bolt holes for connecting to the vehicle frame. The testing bench provided by this utility model can perform bending and torsional tests; the bench is suitable not only for heavy-duty vehicle frames but also for light-duty vehicle frames; the bench testing closely reflects actual conditions, utilizing the vehicle frame's built-in auxiliary facilities, reducing additional tooling processing costs.

Description

Technical Field

[0001] This utility model relates to the field of automotive testing technology, and in particular to a novel heavy-duty vehicle frame bending and torsional fatigue testing bench. Background Technology

[0002] The statements in this section are merely background information relating to this disclosure and do not necessarily constitute prior art.

[0003] Heavy-duty vehicle frame fatigue testing benches are key equipment for evaluating the structural reliability of heavy-duty vehicle frames, such as those used in construction machinery, mining trucks, and military vehicles. Existing technologies have the following drawbacks: (1) Limited functionality: Existing chassis fatigue test benches can only simulate chassis bending conditions by fixing both ends and simultaneously loading vertically with dual actuators, and cannot perform torsion tests. Alternatively, they can only perform chassis torsion fatigue tests by releasing degrees of freedom through ball joint connections, but lack bending test capabilities.

[0004] (2) Existing test bench fixtures excessively constrain the degrees of freedom of the chassis, resulting in distorted test results that cannot reflect the flexible deformation under actual working conditions. The high-frequency loading capacity for heavy-duty chassis is insufficient, the dynamic response of the system is lagging, and the test accuracy is low. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this utility model provides a novel heavy-duty vehicle frame bending and torsional fatigue testing bench, including a platform, a front fixture, and a rear fixture. The front tooling includes a front tooling bracket and a front tooling mounting base, and the front tooling bracket is detachably connected to the front tooling mounting base via a pin. The rear tooling includes a rear tooling bracket and a rear tooling mounting base, and the rear tooling bracket is detachably connected to the rear tooling mounting base via a pin. Both the front and rear tooling brackets are equipped with bolt holes for connecting the vehicle frame.

[0006] Furthermore, it also includes a gantry frame, which consists of two longitudinal beams and a crossbeam, with the two ends of the crossbeam fixedly connected to the two longitudinal beams respectively.

[0007] Furthermore, it also includes electro-hydraulic servo actuators, of which two are provided and symmetrically mounted on the gantry.

[0008] Furthermore, an actuator mounting base is provided on the crossbeam, and the electro-hydraulic servo actuator is fixed to the actuator mounting base by bolts.

[0009] Furthermore, it also includes a controller, which is connected to the electro-hydraulic servo actuator via signal connection.

[0010] Furthermore, the front tooling bracket is used to simulate the front axle of the vehicle frame, and the rear tooling bracket is used to simulate the rear axle of the vehicle frame, with the front tooling bracket connected to the vehicle frame by bolts.

[0011] Furthermore, it also includes sensors mounted on the chassis, which are connected to the controller signals to collect bending, torsion, and strain data.

[0012] Furthermore, the front tooling bracket is connected to the vertical connecting rod, the horizontal thrust rod, and the longitudinal thrust rod via ball joints.

[0013] Furthermore, the rear tooling bracket is connected to the rear axle leaf spring by bolts.

[0014] Furthermore, the pin is a cylindrical straight shaft, and the outer diameter of the pin is equal to the inner diameter of the shaft hole on the front tooling bracket and the front tooling mounting seat.

[0015] Compared with the prior art, the novel heavy-duty vehicle frame bending and torsional fatigue testing bench provided by this utility model has the following beneficial effects: Employing two electro-hydraulic servo actuators, it can perform bending and torsion tests separately. The test bench is suitable for both heavy-duty and light-duty vehicle frames. The test bench closely reflects actual conditions, utilizing the vehicle frame's built-in accessories to reduce additional tooling processing costs. The test bench tooling is detachable and assembleable; the tooling mounting base and mounting bracket are connected by bolts, releasing the rotational freedom around the axle axis. The tooling ensures structural stability while facilitating installation and disassembly. The test bench tooling is highly versatile; the front and rear frame mounting bases are interchangeable, front, rear, left, and right respectively, and it remains applicable even with new vehicle frames. The test bench tooling has a simple structure, requiring only front and rear tooling brackets and tooling mounting bases (detachable and reusable), eliminating the need for designing and manufacturing additional structures. The structure is aesthetically pleasing and robust. Attached Figure Description

[0016] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure.

[0017] Figure 1 A schematic diagram of the overall structure of the novel heavy-duty vehicle frame bending and torsional fatigue testing bench provided by this utility model during bending tests; Figure 2 A schematic diagram of the overall structure of the novel heavy-duty vehicle frame bending and torsional fatigue testing bench provided by this utility model during torsion testing; Figure 3 A schematic diagram of the front tooling structure and its auxiliary facilities of the novel heavy-duty vehicle frame bending and torsional fatigue testing bench provided for this utility model; Figure 4 A schematic diagram of the front tooling structure of the novel heavy-duty vehicle frame bending and torsional fatigue testing bench provided by this utility model; Figure 5A schematic diagram of the front tooling bracket in the front tooling structure provided by this utility model; Figure 6 A schematic diagram of the front tooling mounting base in the front tooling structure provided by this utility model; Figure 7 A schematic diagram of the rear tooling structure and its auxiliary facilities and components of the novel heavy-duty vehicle frame bending and torsional fatigue testing bench provided for this utility model; Figure 8 A schematic diagram of the rear tooling structure of the novel heavy-duty vehicle frame bending and torsional fatigue testing bench provided by this utility model; Figure 9 A schematic diagram of the rear tooling bracket in the rear tooling structure provided by this utility model; Figure 10 A schematic diagram of the rear tooling mounting base in the rear tooling structure provided by this utility model; Figure 11 A schematic diagram of the gantry structure of the novel heavy-duty vehicle frame bending and torsional fatigue testing bench provided by this utility model; Figure 12 A schematic diagram of the rear axle leaf spring and its auxiliary components of the novel heavy-duty vehicle frame bending and torsional fatigue testing bench provided by this utility model.

[0018] The components include: 1. Gantry frame; 2. Electro-hydraulic servo actuator; 3. Chassis; 4. Platform; 5. Front tooling; 5-1. Front tooling bracket; 5-2. Front tooling mounting base; 6. Rear tooling; 6-1. Rear tooling bracket; 6-2. Rear tooling mounting base; 7. Lateral thrust rod; 8. Vertical connecting rod; 9. Longitudinal thrust rod; 10. Pin shaft; 11. Rear axle leaf spring; 12. Crossbeam; 13. Longitudinal beam; 14. Z-beam; 15. Thrust rod seat. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] like Figure 1 and Figure 2 This utility model provides a novel heavy-duty vehicle frame bending and torsional fatigue test bench, including a platform (4), a front fixture (5) and a rear fixture (6). like Figures 3 to 6 The front tooling (5) includes a front tooling bracket (5-1) and a front tooling mounting base (5-2). The front tooling bracket (5-1) is detachably connected to the front tooling mounting base (5-2) via a pin (10). like Figures 7 to 10The rear tooling (6) includes a rear tooling bracket (6-1) and a rear tooling mounting base (6-2). The rear tooling bracket (6-1) is detachably connected to the rear tooling mounting base (6-2) via a pin (10). like Figure 5 and Figure 9 Both the front tooling bracket (5-1) and the rear tooling bracket (6-1) are provided with bolt holes for connecting the frame (3).

[0021] Among them, the platform (4) is made of cast iron and has evenly distributed T-slots on its surface, which provide a rigid support base for the entire test bench. The T-slots are used for quick positioning and fixing of tooling mounting seats.

[0022] The detachable design of the pin (10) enables switching between bending and torsion test modes (the pin locks the degree of freedom for bending tests, and the pin releases the degree of freedom for torsion tests). The front tooling bracket (5-1) simulates the front axle of the chassis, and the rear tooling bracket (6-1) simulates the rear axle of the chassis, restoring the real stress state. The bolt holes on the tooling bracket are directly connected to the chassis (3), avoiding additional fixture processing.

[0023] Specifically, the test bench also includes an electro-hydraulic servo actuator (2), of which there are two, symmetrically mounted on the gantry (1). By using two electro-hydraulic servo actuators (single-axis thrust ≥500kN), bending, torsion and other test loadings can be achieved respectively, making it more versatile and reducing the cost of multiple sets of tooling.

[0024] Specifically, such as Figure 11 The test bench also includes a gantry frame (1), which includes two longitudinal beams (13) and a crossbeam (12). The two ends of the crossbeam (12) are fixedly connected to the two longitudinal beams (13) respectively. Specifically, an actuator mounting base is provided on the crossbeam (12), and the electro-hydraulic servo actuator (2) is fixed to the actuator mounting base by bolts. The actuator mounting base ensures the rigid fixation of the actuator and prevents displacement during loading; the overall frame structure ensures stability under high-frequency loading.

[0025] Specifically, the test bench also includes a controller, which is connected to the electro-hydraulic servo actuator (2) via signal. The controller is programmed to control the motion mode and load parameters of the actuator, and the specific control process is implemented using existing program code.

[0026] Specifically, the front tooling bracket (5-1) is used to simulate the front axle of the vehicle frame, and the rear tooling bracket (6-1) is used to simulate the rear axle of the vehicle frame. The front tooling bracket (5-1) is connected to the vehicle frame (3) by bolts.

[0027] Specifically, the test bench also includes sensors, which are mounted on the chassis (3) and connected to the controller for signal acquisition of bending, torsion, and strain data. The sensors acquire chassis strain / deformation data in real time to form a closed-loop control.

[0028] Specifically, such as Figure 3 The front tooling bracket (5-1) is connected to the vertical connecting rod (8), the transverse thrust rod (7) and the longitudinal thrust rod (9) respectively via ball joints.

[0029] Specifically, such as Figure 7 and Figure 12 The rear tooling bracket (6-1) is connected to the rear axle leaf spring (11) by bolts.

[0030] Specifically, the pin (10) is a cylindrical straight shaft, and the outer diameter of the pin (10) is equal to the inner diameter of the shaft hole on the front tooling bracket (5-1) and the front tooling mounting base (5-2).

[0031] In one specific embodiment, the present invention adopts the following technical solution: A heavy-duty vehicle frame test bench has the following structural features: it consists of a platform (4), a gantry (1), a front fixture (5), a rear fixture (6), an electro-hydraulic servo actuator (2), a vehicle frame (3), and its auxiliary facilities. The front and rear fixture mounting seats play a supporting and positioning role.

[0032] The front and rear tooling brackets are connected to the tooling mounting seats on both sides via pins, which effectively releases the rotational freedom around the axle axis. This ensures structural stability, facilitates installation and disassembly, and is beneficial for later installation and positioning.

[0033] The chassis retains all structures except for the axles. The chassis and tooling are connected by bolts to realistically reproduce the actual situation and minimize the deviation between the stress state and the actual driving conditions.

[0034] The front tooling bracket (5-1) simulates the front axle, the rear tooling bracket (6-1) simulates the rear axle, and the vertical connecting rod (8) is connected to the simulated front axle rod through a ball joint.

[0035] The sensors collect data on the bending, torsion, and strain of the chassis and send them to the controller.

[0036] Employing two electro-hydraulic servo actuators (single-axis thrust ≥500kN), it can separately achieve bending, torsion and other test loading, making it more versatile and reducing the cost of multiple tooling sets.

[0037] During the bending test only, the front tooling bracket is retained. The electro-hydraulic servo actuator is activated, and the support plate applies downward pressure to the frame, causing the frame to deform and simulate bending deformation. Sensors distributed on the frame collect bending and strain data and send them to the controller.

[0038] During the torsion test only, the front fixture simulates the front axle and front suspension. The front fixture mounting base (5-2) only serves as a support when not being tested. During the test, the pull-out pin is removed, so the front fixture mounting base does not function. Only the front fixture bracket simulates the function of the front axle and front suspension. The left electro-hydraulic servo actuator moves downward (upward) and the right electro-hydraulic servo actuator moves upward (downward), causing the frame to deform. Sensors distributed on the frame collect torsion data and strain data and send them to the controller.

[0039] The working principle of this utility model is as follows: This invention achieves switching between bending and torsion test modes through a detachable pin structure. The specific process is as follows: like Figure 1 In the bending test mode, firstly, the pin is inserted into the shaft hole of the front tooling bracket and the front tooling mounting seat to lock the rotational freedom of the front tooling. Then, the frame is fixed to the bolt holes of the front / rear tooling brackets with bolts. Next, the controller controls two electro-hydraulic servo actuators to move downward synchronously, applying a vertical load to the frame to simulate bending conditions. Finally, sensors collect the bending strain data of the frame and feed it back to the controller.

[0040] like Figure 2 In the torsion test mode, firstly, the pin between the front tooling bracket and the front tooling mounting seat is pulled out, releasing the rotational freedom around the axle axis. Then, the controller controls the two actuators to move in opposite directions (the left actuator presses down and the right actuator lifts up, or vice versa), causing the frame to undergo torsional deformation. Finally, sensors monitor the frame's torsional angle and strain distribution in real time.

[0041] Regarding the linkage of key structures: The vertical connecting rod of the front tooling bracket is connected to the front axle simulation rod via a ball joint, ensuring the release of degrees of freedom during torsion. The rear tooling bracket remains fixed, providing stable support.

[0042] In the description of this specification, the terms "connection", "installation", "fixing", "setting", etc. are interpreted in a broad sense. For example, "connection" can be a fixed connection or an indirect connection through an intermediate component without affecting the relationship between components and the technical effect. It can also be an integral connection or a partial connection. In such cases, those skilled in the art can understand the specific meaning of the above terms in this utility model or utility model according to the specific circumstances.

[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A novel heavy-duty vehicle frame bending and torsional fatigue testing bench, characterized in that, Includes platform (4), front tooling (5) and rear tooling (6); The front tooling (5) includes a front tooling bracket (5-1) and a front tooling mounting base (5-2). The front tooling bracket (5-1) is detachably connected to the front tooling mounting base (5-2) via a pin (10). The rear tooling (6) includes a rear tooling bracket (6-1) and a rear tooling mounting base (6-2). The rear tooling bracket (6-1) is detachably connected to the rear tooling mounting base (6-2) via a pin (10). Both the front tooling bracket (5-1) and the rear tooling bracket (6-1) are provided with bolt holes for connecting the frame (3).

2. The test stand of claim 1, wherein It also includes a gantry frame (1), which includes two longitudinal beams (13) and a crossbeam (12), with the two ends of the crossbeam (12) being fixedly connected to the two longitudinal beams (13) respectively.

3. The test stand of claim 2, wherein It also includes an electro-hydraulic servo actuator (2), of which two are provided and are symmetrically installed on the gantry (1).

4. The test stand of claim 3, wherein The crossbeam (12) is provided with an actuator mounting base, and the electro-hydraulic servo actuator (2) is fixed to the actuator mounting base by bolts.

5. Test rig according to claim 3 or 4, characterized in that It also includes a controller, which is signal-connected to the electro-hydraulic servo actuator (2).

6. The test stand of claim 1 wherein, The front tooling bracket (5-1) is used to simulate the front axle of the vehicle frame, and the rear tooling bracket (6-1) is used to simulate the rear axle of the vehicle frame. The front tooling bracket (5-1) is connected to the vehicle frame (3) by bolts.

7. The test stand of claim 5, wherein It also includes sensors, which are mounted on the frame (3) and are connected to the controller for collecting bending data, torsion data and strain data.

8. The test stand of claim 1 wherein, The front tooling bracket (5-1) is connected to the vertical connecting rod (8), the horizontal thrust rod (7) and the longitudinal thrust rod (9) via ball joints.

9. The test stand of claim 1 wherein, The rear tooling bracket (6-1) is connected to the rear axle leaf spring (11) by bolts.

10. The test stand of claim 1 wherein, The pin (10) is a cylindrical straight shaft, and the outer diameter of the pin (10) is equal to the inner diameter of the shaft hole on the front tooling bracket (5-1) and the front tooling mounting seat (5-2).

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