U-shaped bolt fatigue test device

Abstract

A U-shaped bolt fatigue test device comprises bases in bilateral symmetry and plate springs supported on the bases on the two sides, bearing rollers capable of freely rotating are arranged at the two ends of each plate spring respectively, the bearing rollers at the ends are rotationally supported on the bases correspondingly, the center of each plate spring protrudes upwards, and a connecting block is fixed to each plate spring through a plurality of U-shaped bolts and nuts. And the plate spring penetrates through each U-shaped bolt. The U-shaped bolt fatigue testing device can be conveniently connected with an MTS servo testing machine, a road spectrum is applied by the servo machine when an automobile runs, and a plate spring is driven to move up and down, so that the stress state of the U-shaped bolt in actual work and the torque change of a nut are simulated, the fatigue limit value of the U-shaped bolt is further obtained, the experimental result is almost free of deviation, and the measured data are more accurate and reliable.

Description

Technical Field

[0001] The utility model relates to a test tooling, in particular to a fatigue test device for U-shaped bolts. Background Art

[0002] U-shaped bolts are important components for connecting vehicle leaf springs with front and rear axles. At present, samples are generally taken from products for inspection. Currently, there is no relevant test device in the industry for the fatigue test of the whole U-shaped bolt. The force mode of the U-shaped bolt after assembly is different from that of the sample, so the experimental results are deviated, affecting the subsequent judgment of product performance. Content of the Utility Model

[0003] In order to solve the above problems, the purpose of the utility model is to provide a fatigue test device for U-shaped bolts.

[0004] To achieve the above purpose, the technical solution of the utility model is: a fatigue test device for U-shaped bolts, including symmetric left and right bases and leaf springs supported on both sides of the bases. And freely rotatable bearing rollers are respectively arranged at both ends of the leaf springs, and the bearing rollers at each end are respectively rotationally supported on the bases. The center of the leaf spring bulges upward, and a connecting block is fixed through a plurality of U-shaped bolts and nuts, and the leaf spring penetrates through each U-shaped bolt.

[0005] Further, slide rails are respectively fixed on the upper surfaces of both sides of the bases, and the slide rails are arranged along the moving direction of the bearing rollers, so that the bearing rollers at each end are respectively rotationally supported on the slide rails.

[0006] Further, a cushion block is clamped between the center of the lower surface of the leaf spring and the U-shaped bolt.

[0007] Further, a connecting bracket is fixed on the upper surface of the connecting block.

[0008] Further, both sides of the slide rail are fixedly connected with the surface of the base through triangular reinforcing plates.

[0009] Further, the base is of a frame structure and is cuboid-shaped.

[0010] Further, the cross-section of the slide rail is a horizontal I-shaped structure, and a support plate integrated with the slide rail is supported at the center of the bottom.

[0011] With the above settings, each part of the utility model is independent of each other. To test U-bolts of different specifications, only the connecting block needs to be replaced, which is simple and quick to operate. It has universality among different products, avoiding the waste caused by frequent replacement and production of tooling. The utility model is convenient to be connected with an MTS servo testing machine. By applying the road spectrum during vehicle driving through the servo machine, the leaf spring is driven to move up and down, thereby simulating the stress state and nut torque change of the U-bolt during actual operation, and further obtaining the fatigue limit value of the U-bolt. Moreover, the experimental results have almost no deviation, and the measured data is more accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present utility model will be further described in conjunction with the accompanying drawings.

[0013] Figure 1 is a front view structural schematic diagram of the present utility model;

[0014] Figure 2 is a side view structural schematic diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] As Figure 1-2 shown, a U-bolt fatigue test device includes a base 1 that is symmetric left and right and a leaf spring 2 supported on both sides of the base 1. The base 1 is a frame structure and is rectangular in shape. Both ends of the leaf spring 2 are provided with freely rotatable bearing rollers 3, and the bearing rollers 3 at each end are respectively rotatably supported on the base 1. The center of the leaf spring 2 protrudes upward and is fixed with a connecting block 5 through a plurality of U-bolts 4 and nuts. The leaf spring 2 passes through each U-bolt 4.

[0016] On the upper surface of each side of the base 1, a slide rail 6 is respectively fixed. Both sides of the slide rail 6 are fixedly connected to the surface of the base 1 through triangular reinforcing plates 9. The cross-section of the slide rail 6 is a horizontal I-shaped structure, and a support plate 10 integrated with the slide rail 6 is supported at the center of the bottom. The slide rail 6 is arranged along the moving direction of the bearing roller 3, so that the bearing rollers 3 at each end are respectively rotatably supported on the slide rail 6. A spacer 7 is clamped between the center of the lower surface of the leaf spring 2 and the U-bolt 4. A connecting bracket 8 is fixed on the upper surface of the connecting block 5.

[0017] Working principle of the present utility model:

[0018] The connecting block 5 is connected to an MTS servo testing machine (existing equipment). By applying the road spectrum during vehicle driving through the servo machine, the leaf spring 2 is driven to move up and down, causing the leaf spring 2 to deform, thereby causing displacement at the initial points at both ends of the leaf spring 2, changing the force on the U-bolt 4, generating stress and strain. Through continuous changes in force and displacement, the stress state and nut torque change of the U-bolt during actual operation are simulated, and further the fatigue limit value of the U-bolt is obtained.

[0019] The above are only illustrative specific embodiments of the present utility model, and are not intended to limit the scope of the present utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present utility model shall fall within the scope of protection of the present utility model.

Claims

1. A U-bolt fatigue test device, comprising a bilaterally symmetrical base (1) and leaf springs (2) supported on the bases (1) on both sides, characterized in that: Both ends of the leaf spring (2) are provided with freely rotatable bearing rollers (3), and the bearing rollers (3) at each end are rotatably supported on the base (1) in a corresponding manner. The center of the leaf spring (2) protrudes upward and is fixed with a connecting block (5) via a plurality of U-shaped bolts (4) and nuts, and the leaf spring (2) passes through each U-shaped bolt (4).

2. A U-bolt fatigue testing device as claimed in claim 1, characterized in that: A slide rail (6) is fixed to the upper surface of the base (1) on each side, and the slide rail (6) is arranged along the moving direction of the bearing roller (3), so that the bearing roller (3) at each end is rotatably supported on the slide rail (6).

3. A U-bolt fatigue testing device as claimed in claim 1, characterized in that: A cushion block (7) is sandwiched between the center of the lower surface of the leaf spring (2) and the U-shaped bolt (4).

4. A U-bolt fatigue testing device as claimed in claim 1, characterized in that: A connecting bracket (8) is fixed to the upper surface of the connecting block (5).

5. A U-bolt fatigue testing device as claimed in claim 1, characterized in that: Both sides of the slide rail (6) are fixedly connected to the surface of the base (1) via triangular reinforcement plates (9) respectively.

6. A U-bolt fatigue testing device as claimed in claim 1, characterized in that: The base (1) is a frame structure and is in the shape of a rectangular parallelepiped.

7. A U-bolt fatigue testing device as claimed in claim 2, characterized in that: The cross section of the slide rail (6) is a horizontal I-shaped structure, and a support plate (10) integral with the slide rail (6) is supported at the center of the bottom.

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