Universal bushing rigidity test tool clamp

Abstract

The utility model relates to a general bushing rigidity test work fixture which comprises a fixture seat, the fixture seat is provided with a plurality of fixing bolt holes, the fixture seat is provided with an open hole used for placing a bushing, and at least three clamping assemblies used for clamping the bushing are arranged in the open hole. The clamping assembly comprises sliding blocks and adjusting bolts, each sliding block comprises a clamping part used for clamping the lining and a guide sliding arm used for being in sliding fit with the upper end and the lower end of the clamp base, the guide sliding arms are in sliding fit with guide bases correspondingly arranged at the upper end and the lower end of the clamp base respectively, and threaded holes penetrating in the radial direction are formed in the positions, corresponding to the sliding blocks, of the side wall of the clamp base. The adjusting bolt is installed in the threaded hole in a threaded fit mode and penetrates through the threaded hole to abut against the sliding block. When the test tool clamp is used for carrying out rigidity test on the bushing, the bushing is placed in the open hole, an operator manually rotates the adjusting bolt to push the sliding block, the sliding block is used for clamping and fixing the bushing, the test tool clamp can adapt to bushings of different sizes, the universality is high, and the test cost is low.

Description

Technical Field

[0001] This utility model relates to the field of automotive chassis systems, specifically to a universal bushing stiffness testing fixture. Background Technology

[0002] As a damping and load-bearing component of the automotive chassis, the stiffness of the bushing directly affects the vibration transmission efficiency of the system. Therefore, it is necessary to evaluate the mechanical properties of the bushing through stiffness testing to ensure that it meets the design specifications.

[0003] When conducting static stiffness testing on the bushing, it is necessary to perform the test on a servo-based material fatigue testing system – a high-frequency elastic material testing bench. The base of the testing bench is equipped with a fixture for locking and securing the bushing. The specific testing process is as follows: The bushing is secured using the fixture. The pressure head of the testing bench is manually lowered until it just contacts the bushing. The maximum load is set to 3000N, and the downward speed of the pressure head is adjusted to 0.05mm / s for the loading test. The stiffness value of the bushing can be calculated by recording and generating the force-displacement curve in real time.

[0004] The fixture mounted on the base of the test bench uses two corresponding arc-shaped clamping blocks to hold the bushing. Therefore, before testing, it is necessary to select the appropriate arc-shaped clamping block according to the bushing's diameter, hold the bushing through the arc-shaped opening of the clamping block, and then fix the arc-shaped clamping block to the fixture with bolts to secure the bushing. This process is cumbersome, time-consuming, and labor-intensive. Different sized arc-shaped clamping blocks with different arc openings must be used for bushings of different sizes, resulting in lengthy fixture preparation time. Furthermore, the large number of arc-shaped clamping blocks occupies significant storage space, causing substantial waste of labor and materials, and ultimately increasing testing costs. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a universal bushing stiffness testing fixture. This fixture can be adapted to test bushings of different sizes, exhibiting strong versatility and saving both tooling preparation time and cost.

[0006] The objective of this utility model is achieved through the following solution:

[0007] A general bushing stiffness testing fixture includes a fixture base with multiple fixing bolt holes and an opening for placing bushings. At least three clamping components for holding the bushings are disposed within the opening. Each clamping component includes a slider and an adjusting bolt. The slider includes a clamping part for holding the bushing and a guide arm for slidingly engaging with the upper and lower ends of the fixture base. The guide arm slides in cooperation with guide seats corresponding to the upper and lower ends of the fixture base. A radially penetrating threaded hole is provided on the side wall of the fixture base corresponding to each slider. The adjusting bolt is installed in the threaded hole through the thread and abuts against the slider.

[0008] Preferably, the clamping part is provided with a clamping surface for clamping the bushing, and the clamping surface is an arc-shaped surface.

[0009] Preferably, the guide seat is provided with a guide groove for sliding cooperation with the guide slide arm.

[0010] Preferably, the cross-section of the guide slide arm is I-shaped, and the guide groove is an I-shaped groove.

[0011] Preferably, the clamp base has a regular hexagonal cylindrical structure, the opening is coaxially arranged with the regular hexagonal cylindrical structure, and three clamping components are provided, which are respectively arranged in three positions of the clamp base and spaced 120 degrees apart from each other.

[0012] Preferably, the side wall of the clamp seat has two threaded holes corresponding to each slider.

[0013] Preferably, the guide seat is fixedly connected to the clamp seat by axial bolts.

[0014] Preferably, the side wall of the fixture seat is provided with a relief opening for accommodating each slider, and the relief opening is connected to the threaded hole.

[0015] The beneficial effects of this utility model are:

[0016] 1. The fixture base 1 is provided with multiple fixing bolt holes 2. Connecting bolts pass through the base of the test bench and connect to the fixing bolt holes to fix the fixture base on the base of the test bench. When performing static stiffness testing on the bushing, the bushing is placed in the opening of the fixture base and clamped and fixed by the clamping assembly. Then, the static stiffness test can begin. The pressure head of the test bench is manually lowered until it just contacts the bushing. The maximum load is set to 3000N, and the downward speed of the pressure head is adjusted to 0.05mm / s for the loading test. The stiffness value of the bushing can be calculated by recording and generating the force-displacement curve in real time. The clamping assembly enables locking and fixing of the bushing, adapting to bushings of different sizes, offering strong versatility, reducing testing costs, and improving testing efficiency.

[0017] 2. When clamping the bushing, manually tighten the adjusting bolt. This uses the adjusting bolt to move the slider, causing the clamping surface of the clamping part to contact and press against the bushing. At least three sliders are used to clamp and fix the bushing. By adjusting the screw depth of the adjusting bolt, the slider is pushed to clamp the bushing, meeting the clamping requirements of bushings of different diameters.

[0018] 3. It is equipped with three clamping components located in three directions and spaced 120 degrees apart from each other, which makes the force more even when the bushing is locked.

[0019] 4. By setting up the guide seat and guide slide arm, and opening the guide groove on the guide seat to cooperate with the guide slide arm, it can provide a mounting base for the slider and guide the movement of the slider, making the slider clamping the bushing more stable and improving the overall integrity of the tooling fixture.

[0020] This invention uses a clamping assembly and a slider-assisted position adjustment structure to lock and fix the bushing, adapting to the locking and fixing of bushings of different diameters. It has strong versatility, can greatly reduce testing costs and improve testing efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a general bushing stiffness testing fixture disclosed in this utility model;

[0022] Figure 2 This is a schematic diagram of a universal bushing stiffness testing fixture disclosed in this utility model with the bushing in a locked state;

[0023] Figure 3 for Figure 2 Top view;

[0024] Figure 4 This is an isometric view of the fixture base;

[0025] Figure 5 This is an enlarged schematic diagram of the slider and guide arm.

[0026] Among them, 1. clamp seat; 2. fixing bolt hole; 3. bushing; 4. slider; 41. clamping part; 42. guide slide arm; 5. adjusting bolt; 6. threaded hole; 7. guide seat; 8. guide groove; 9. axial bolt; 10. opening; 11. clearance opening. Detailed Implementation

[0027] like Figures 1 to 5As shown, a general bushing stiffness testing fixture includes a fixture base 1, which has a regular hexagonal cylindrical structure. The fixture base has three fixing bolt holes 2 and an opening 10 for placing a bushing 3. The opening 10 is coaxially arranged with the regular hexagonal cylindrical structure. Three clamping components for clamping the bushing are arranged in the opening 10. The three clamping components are respectively arranged in three positions of the fixture base and are spaced 120 degrees apart from each other. The clamping components are staggered with the fixing bolt holes. The clamping components include sliders 4 and adjusting bolts 5. The sliders 4 include a clamping part 41 for clamping the bushing 3 and a guide arm 42 for sliding cooperation with the upper and lower ends of the fixture base 1. The guide arm 42 is slidably cooperated with the guide seats 7 respectively arranged on the upper and lower ends of the fixture base 1. The side wall of the fixture base 1 is provided with radially penetrating threaded holes 6 corresponding to each slider 4. The adjusting bolts 5 are installed in the threaded holes 6 through the threaded holes 6 and abut against the sliders 4. This fixture, through the coordination of adjusting bolt 5 and slider 4, pushes slider 4 to clamp bushing 3 according to the screw-in amount of adjusting bolt 5. This enables the locking and fixing of bushings 3 of different diameters, eliminating the need to develop arc-shaped clamping blocks specific to the bushing 3's diameter. This significantly reduces fixture development time and material consumption, further lowering testing costs. This fixture has a high versatility and can better meet the locking and fixing needs of bushings of different diameters.

[0028] Thus, the fixture base 1 is provided with three fixing bolt holes 2. The connecting bolts pass through the base of the test bench and connect to the fixing bolt holes 2 to fix the fixture base 1 on the base of the test bench. The bushing 3 is placed in the opening 10 of the fixture base 1, and the adjusting bolt 5 is manually rotated. The adjusting bolt 5 pushes the slider 4 to move, and the bushing 3 is clamped by the clamping part to achieve locking and fixing of the bushing 3. Of course, in specific implementation, there can also be 2, 4 or other numbers of fixing bolt holes 2; there can also be 4, 6 or other numbers of clamping components. The three clamping components are set at 120° intervals between each other, which can make the force applied to the bushing 3 by the three sliders 4 more uniform.

[0029] In this specific embodiment, the clamping part 41 is provided with a clamping surface for clamping the bushing 3, and the clamping surface is an arc-shaped surface. Increasing the contact area with the bushing 3 enables more stable clamping of the bushing.

[0030] In this specific embodiment, the guide seat 7 is provided with a guide groove 8 for sliding engagement with the guide slide arm 42, thereby achieving a sliding engagement between the guide slide arm and the guide seat.

[0031] In this specific embodiment, the cross-section of the guide slide arm 42 is I-shaped, and the guide groove 8 is an I-shaped groove. The I-shaped sliding fit structure increases the contact area between the guide slide arm 42 and the guide seat 7, making the slider 4 more stable during movement. Of course, in actual implementation, the cross-section of the guide slide arm 42 can be T-shaped, dovetail-shaped, or other shapes, and the guide groove 8 is set in the same shape as the guide slide arm 42. The guide seat 7 provides guidance for the guide slide arm 42 and also provides a mounting base for the slider 4.

[0032] In this specific embodiment, the side wall of the clamp seat 1 has two threaded holes 6 corresponding to each slider 4. By applying force to the slider 4 simultaneously with two adjusting bolts 5, the slider 4 is subjected to more stable force.

[0033] In this specific embodiment, the guide seat 7 is fixedly connected to the clamp seat 1 by an axial bolt 9. This facilitates the fixed connection between the guide seat 7 and the clamp seat 1.

[0034] In this specific embodiment, the side wall of the fixture base 1 is provided with a clearance opening 11 for accommodating each slider 4, and the clearance opening 11 communicates with the threaded hole 6. The slider 4 can slide into the clearance opening 11, further reducing the space occupied by the slider 4, expanding the applicability range of this tooling fixture, locking bushings 3 of different diameters, and further improving versatility. Specifically, when the slider is located in the clearance opening, the clamping surface and the opening hole surface are on the same circumference, improving overall integrity.

[0035] During assembly, bolts are used to pass through the base of the test bench and connect with the fixing bolt hole 2 through thread engagement to fix the fixture seat 1 on the base of the test bench.

[0036] Working principle:

[0037] When performing a static stiffness test on bushing 3, bushing 3 is placed in the opening 10 of fixture seat 1, and adjusting bolt 5 is manually rotated. Adjusting bolt 5 contacts slider 4 and pushes slider 4 to move. Guide groove 8 and guide slide arm 42 slide to guide the movement of slider 4, so that the clamping part 41 of slider 4 abuts against bushing 3 and squeezes bushing 3, thus completing the locking and fixing of bushing 3.

[0038] Then, the pressure head of the test bench is manually lowered. The descent is stopped when the pressure head of the test bench just contacts the bushing. The maximum load is set to 3000N and the downward speed of the pressure head is adjusted to 0.05mm / s for loading test. The stiffness value of the bushing can be calculated by recording and generating the force-displacement curve in real time.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications made to the present utility model by those skilled in the art without departing from the spirit of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A general-purpose bushing stiffness testing fixture, comprising a fixture base (1), wherein the fixture base (1) is provided with a plurality of fixing bolt holes (2), characterized in that: The clamp base (1) is provided with an opening (10) for placing the bushing (3), and at least three clamping components for clamping the bushing (3) are provided in the opening (10); The clamping assembly includes a slider (4) and an adjusting bolt (5). The slider (4) includes a clamping part (41) for clamping the bushing (3) and a guide arm (42) for slidingly engaging with the upper and lower ends of the clamping seat (1). The guide arm (42) is slidably engaged with the guide seats (7) respectively provided on the upper and lower ends of the clamping seat (1). The side wall of the clamping seat (1) is provided with a radially penetrating threaded hole (6) corresponding to each slider (4). The adjusting bolt (5) is installed in the threaded hole (6) through the threaded engagement and abuts against the slider (4) through the threaded hole (6).

2. The universal bushing stiffness testing fixture as described in claim 1, characterized in that: The clamping part (41) is provided with a clamping surface for clamping the bushing (3), and the clamping surface is an arc-shaped surface.

3. The universal bushing stiffness testing fixture as described in claim 1, characterized in that: The guide seat (7) is provided with a guide groove (7) for sliding cooperation with the guide slide arm (42).

4. The universal bushing stiffness testing fixture as described in claim 3, characterized in that: The cross-section of the guide slide arm (42) is "I" shaped, and the guide groove (8) is an "I" groove.

5. The universal bushing stiffness testing fixture as described in claim 1, characterized in that: The clamp base (1) has a regular hexagonal cylindrical structure. The opening (10) is coaxially arranged with the regular hexagonal cylindrical structure. There are three clamping components, which are respectively arranged in three positions of the clamp base (1) and spaced 120 degrees apart from each other.

6. The universal bushing stiffness testing fixture as described in claim 1, characterized in that: The side wall of the clamp seat (1) has two threaded holes (5) corresponding to each slider (4).

7. The universal bushing stiffness testing fixture as described in claim 1, characterized in that: The guide seat (7) is fixedly connected to the clamp seat (1) by an axial bolt (9).

8. The universal bushing stiffness testing fixture as described in claim 1, characterized in that: The side wall of the fixture seat (1) is provided with a relief opening (11) for accommodating each slider (4), and the relief opening is connected to the threaded hole.

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