A kind of eccentric bolt adjusting structure of frame crossbeam

Abstract

The utility model provides a kind of eccentric bolt adjusting structure of car frame crossbeam, it is related to button installation technical field, including the via hole being set up on crossbeam, via hole side welding installation limiting plate, limiting plate includes with the substrate welding of crossbeam, substrate is set up substrate on correspondence via hole, limiting plate both ends install vertical plate, eccentric bolt is installed by being threaded through via hole and positioning hole, eccentric bolt fixedly installs eccentric gasket;Positioning hole area is less than via hole area;When eccentric bolt rotates to the farthest edge of eccentric gasket and the inside wall of vertical plate abuts, the position of eccentric bolt in positioning hole moves, realize eccentric adjustment, four-wheel alignment can be completed without the processing of limiting structure by mould, positioning hole area is less than via hole area, and the adjustment of hole position degree is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, specifically to an eccentric bolt adjustment structure for a vehicle frame crossbeam. Background Technology

[0002] In automotive rear independent suspensions, wheel toe-in and camber angles are currently adjusted using eccentric bolts. These eccentric bolts, via an eccentric bolt adjustment device on the rear subframe, adjust the lateral position of the toe-in and control rods, thereby changing the tire position and achieving wheel toe-in or camber adjustment.

[0003] Reference Figure 1 The existing eccentric bolt adjustment device includes a subframe body. The irregular protrusions are formed on the crossbeam through a stamping process. After processing, the crossbeam is welded to the subframe assembly. The irregular protrusions limit the shims of the eccentric bolts to achieve adjustment of the rear wheel toe-in and camber angle.

[0004] In existing technologies, the subframe and eccentric bolt limiting structure are usually designed as a single unit. Although this single unit improves precision, it presents the following technical problems during production: (1) When producing the limiting structure, multiple irregular protrusions need to be produced by mold. During the demolding process, there are tearing and burr generation phenomena. Therefore, irregular protrusions have high requirements for molds and require additional molds, resulting in high manufacturing costs.

[0005] (2) The irregular protrusion (limiting structure) is reflected in the fact that after the crossbeam is produced as a whole, each crossbeam needs to be welded together to form the subframe. The heat generated during the welding process will cause the mounting holes of the subframe body used for mounting bolts to undergo thermal deformation. After thermal deformation, the center position of the mounting holes changes, and the mounting bolts cannot meet the hole position requirements. Utility Model Content

[0006] The purpose of this utility model is to provide a frame crossbeam eccentric bolt adjustment structure, which can solve the technical problem of high processing requirements of the existing eccentric limit structure of the vehicle body crossbeam.

[0007] To achieve the above objectives, this utility model proposes an eccentric bolt adjustment structure for a vehicle frame crossbeam, further comprising a through hole opened on the crossbeam, a limiting plate welded to one side of the through hole, the limiting plate comprising a base plate welded to the crossbeam, a base plate corresponding to the through hole on the base plate, upright plates installed at both ends of the base plate, an eccentric bolt installed through the through hole and the positioning hole, and an eccentric washer fixedly installed on the eccentric bolt. The area of ​​the positioning hole is smaller than the area of ​​the through hole; When the eccentric bolt is rotated to the point where the farthest edge of the eccentric washer abuts against the inner wall of the vertical plate, the eccentric bolt moves at the position of the positioning hole, thereby achieving eccentric adjustment.

[0008] Further configured, the through hole and the positioning hole are elongated oval holes with similar shapes. The through hole includes a rectangular hole with semi-circular holes on both sides. The positioning hole includes a rectangular hole with semi-circular holes on both sides. This provides greater adjustment space and flexibility, making it easier for the eccentric bolt to move along the long axis during adjustment and ensuring smooth eccentric adjustment.

[0009] The vertical plate is further configured such that its thickness is greater than that of the eccentric shim, which ensures that the eccentric shim is effectively limited. This ensures that the vertical plate can effectively restrict the axial movement of the eccentric shim and prevent the eccentric shim from coming off or shifting during the adjustment process, thereby improving the reliability of the limiting.

[0010] Further configured, the crossbeam encloses the front crossbeam, and the front crossbeam has a first concave mounting surface. The first concave mounting surface is a rectangular concave surface with rounded corners. When the limiting surface on the inner side of the first concave mounting surface abuts against the eccentric shim, it further limits the eccentric shim. The first concave mounting surface provides an additional limiting surface. When the eccentric shim abuts against the inner vertical surface, it can further limit its rotation range, thereby enhancing the bidirectional limiting effect on the eccentric shim.

[0011] Further configured, the crossbeam encloses the rear crossbeam, and the rear crossbeam has a second concave mounting surface. The second concave mounting surface is a fan-shaped concave surface. When the limiting surface on the inner side of the second concave mounting surface abuts against the eccentric shim, it further limits the eccentric shim. The fan-shaped concave surface adapts to the geometry of the rear crossbeam, providing a more optimized limiting contact surface, so that the eccentric shim can effectively contact the vertical surface during adjustment, further limiting its range of movement.

[0012] The via and the positioning hole have an overlapping area in the projection direction toward the ground. The overlapping area facilitates the adjustment of the hole position and allows for fine-tuning when welding the limiting plate.

[0013] Further configured, the inner side of the upright plate is perpendicular to the long axis of the positioning hole. This perpendicular relationship ensures that the eccentric shim forms a consistent limiting point with the inner side of the upright plate during rotational adjustment, making the eccentric adjustment more precise and predictable.

[0014] A further configuration is made such that the length of the substrate is greater than the diameter of the eccentric pad, ensuring that the eccentric pad can rotate freely on the substrate and that the eccentric pad has sufficient rotation space on the substrate.

[0015] A further feature is that the eccentric shim has scale lines along the circumferential direction, which facilitates the reference for the rotation angle when adjusting the eccentric shim. The scale lines provide an intuitive visual reference, enabling the operator to accurately control the rotation angle of the eccentric shim and achieve more precise adjustment.

[0016] Further configured, the eccentric bolt has a hexagonal bolt head, which facilitates tightening and adjustment using standard tools (such as wrenches or sockets), simplifying the installation and adjustment process.

[0017] The beneficial effects of one or more of the above technical solutions: (1) This utility model welds and installs a limiting plate on the front side of the through hole of the cross beam. The limiting plate includes a base plate welded to the cross beam. A positioning hole is opened on the base plate corresponding to the through hole. Vertical plates are installed at both ends of the base plate. An eccentric bolt is installed through the through hole and the second long oval. An eccentric shim is fixedly installed on the eccentric bolt. When the eccentric bolt rotates to the farthest edge of the eccentric shim abuts against the inner side wall of the limiting plate, the eccentric bolt moves at the position of the positioning hole to achieve eccentric adjustment. Only one base plate and one vertical plate need to be processed. After the base plate is welded to the cross beam, the limiting is achieved by the vertical plate. There is no need to perform drafting of irregular protrusions, which reduces manufacturing costs.

[0018] (2) The area (length and width) of the positioning hole of this utility model is smaller than the area (length and width) of the through hole. After the subframe assembly is welded, the hole position is not qualified due to welding deformation and cumulative tolerance. The hole on the crossbeam is used as the through hole, and the hole on the limit plate is used as the positioning hole and then welded. When welding is performed, the center position on the crossbeam changes. By adjusting the welding position of the limit plate (the overlapping area of ​​the positioning hole side and the through hole side can be adjusted), the center of the positioning hole on the limit plate is used as the final installation center, which meets the hole position requirements. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0020] Figure 1 This is a schematic diagram of the existing eccentric bolt adjustment device.

[0021] Figure 2 This is a schematic diagram of the limiting plate of this utility model.

[0022] Figure 3 This is a schematic diagram of the installation structure of the front crossbeam, the limiting plate, and the eccentric bolts of this utility model.

[0023] Figure 4 This is a schematic diagram of the installation structure of the rear crossbeam, limiting plate, and eccentric bolt of this utility model.

[0024] Figure 5 This is a schematic diagram of the structure of the first recessed mounting surface of this utility model.

[0025] Figure 6This is a schematic diagram of the structure of the second recessed mounting surface of this utility model.

[0026] In the diagram, 1 is the crossbeam; 11 is the front crossbeam; 12 is the rear crossbeam; 13 is the through hole; 14 is the rectangular hole; 15 is the semi-circular hole; 16 is the first recessed mounting surface; 17 is the limiting surface; and 18 is the second recessed mounting surface. 2. Limiting plate; 21. Base plate; 22. Vertical plate; 23. Positioning hole; 3. Eccentric bolt; 31. Hex bolt head; 4. Eccentric washer; 41. Scale marks; 5. Irregularly shaped bumps. Detailed Implementation

[0027] The specific implementation of this embodiment will now be described with reference to the accompanying drawings.

[0028] A frame crossbeam eccentric bolt adjustment structure, referring to Figures 1-6 This includes a through hole 13 opened in the crossbeam 1. A limiting plate 2 is welded and installed on one side of the through hole 13. The limiting plate 2 includes a base plate 21 welded to the crossbeam 1. A positioning hole 23 is opened on the base plate 21 corresponding to the through hole 13. Upright plates 22 are installed at both ends of the base plate 21. The upright plates 22 and the base plate 21 are integrally bent and formed. During installation, an eccentric bolt 3 passes through the through hole 13 and the positioning hole 23. An eccentric washer 4 is fixedly installed on the eccentric bolt 3.

[0029] The area of ​​the positioning hole 23 is smaller than the area of ​​the through hole 13. When the eccentric bolt 3 is rotated until the farthest edge of the eccentric shim 4 on it abuts against the inner wall of the vertical plate 22, the position of the eccentric bolt 3 in the positioning hole 23 will move, thereby realizing eccentric adjustment.

[0030] This embodiment separates and welds the limiting plate 2 to the crossbeam 1, requiring only a base plate 21 and a vertical plate 22 made of metal sheet for positioning. This effectively avoids the problems caused by the complex mold production required for the integrated irregular protrusion 5 in the prior art, thus avoiding high mold costs and the risks of tearing and burrs during demolding. At the same time, since the area of ​​the positioning hole 23 is smaller than that of the through hole 13, when welding the limiting plate 2, the welding position of the limiting plate 2 can be adjusted, and the overlapping area between the two can be used to compensate for welding thermal deformation and cumulative tolerances, ensuring the accurate center position of the positioning hole 23 and ultimately meeting the strict hole position accuracy requirements.

[0031] Specifically, the through hole 13 and the positioning hole 23 are elongated oval holes with similar shapes. The through hole 13 includes a rectangular hole 14, with semi-circular holes 15 on both sides of the rectangular hole 14; the positioning hole 23 also includes a rectangular hole 14, with semi-circular holes 15 on both sides. This similar elongated oval hole design provides greater adjustment space and flexibility, facilitating the movement of the eccentric bolt 3 along its long axis during adjustment, ensuring the smoothness and accuracy of eccentric adjustment. Their similar shapes also simplify the machining and assembly process, reducing production difficulty.

[0032] Furthermore, the thickness of the upright plate 22 is greater than the thickness of the eccentric shim 4. This design ensures that the upright plate 22 can effectively restrict the axial movement of the eccentric shim 4, preventing it from coming off or shifting during adjustment, thereby improving the reliability of the limiting position. The thicker upright plate 22 also enhances the overall structural strength of the limiting plate 2.

[0033] In one application scenario of this embodiment, the crossbeam 1 includes a front crossbeam 11. The front crossbeam 11 has a first recessed mounting surface 13, which is a rectangular recessed surface with rounded corners. When the eccentric shim 4 rotates to abut against the limiting surface 17 inside the first recessed mounting surface 13, the limiting surface 17 further limits the eccentric shim 4. This design is particularly suitable for the installation environment of the front crossbeam 11, providing an additional limiting surface, enhancing the bidirectional limiting effect, and improving adjustment accuracy and structural compactness.

[0034] In another application scenario of this embodiment, the crossbeam 1 includes a rear crossbeam 12. The rear crossbeam 12 has a second recessed mounting surface 15, which is a fan-shaped recessed surface. When the eccentric shim 4 rotates to abut against the limiting surface 17 inside the second recessed mounting surface 15, the limiting surface 17 can also further limit the eccentric shim 4. The fan-shaped recessed surface can better adapt to the geometry of the rear crossbeam 12, providing a more optimized limiting contact surface.

[0035] Furthermore, the via 13 and the positioning hole 23 have an overlapping area in the projection direction towards the ground. This overlapping area is crucial for adjusting the hole position, allowing for fine-tuning during the final welding of the limiting plate 2 to compensate for manufacturing tolerances. Specifically, refer to... Figure 2 , Figure 5 and Figure 6 (Dimensions not marked in the attached diagram) The positioning holes on the substrate are oblong holes of 29mm × 14.5mm, the through holes of the front crossbeam are oblong holes of 30mm × 15.5mm, and the through holes of the rear crossbeam are oblong holes of 33mm × 15.5mm. The through holes of the front and rear crossbeams are 0.5mm to 1.5mm larger than the length or width of the positioning holes on the substrate.

[0036] The inner surface of the upright plate 22 is perpendicular to the long axis of the positioning hole 23. This perpendicular relationship ensures that the eccentric shim 4 can form a consistent and precise limiting point with the inner surface of the upright plate 22 during rotational adjustment, simplifying the limiting mechanism and reducing adjustment errors caused by angular deviations.

[0037] The length of the substrate 21 is greater than the diameter of the eccentric shim 4. This ensures that the eccentric shim 4 has sufficient rotation space on the substrate 21, avoiding interference with the edge of the substrate 21 during adjustment, thus ensuring the free rotation and full adjustment of the eccentric shim 4. At the same time, the larger length of the substrate 21 also improves the overall stability of the limiting plate 2 after welding.

[0038] To facilitate adjustment, a scale line 41 is provided on the eccentric shim 4 along its circumference. This scale line 41 provides an intuitive visual reference for adjusting the rotation angle of the eccentric shim 4, facilitating precise control.

[0039] Finally, the eccentric bolt 3 has a hexagonal bolt head 31. The hexagonal bolt head 31 is in the shape of a regular hexagon, which makes it easy for workers to operate with standard tools such as wrenches or sockets, greatly simplifying the installation and adjustment process, improving the convenience of operation, and ensuring the reliability of the bolt connection.

[0040] In this embodiment, the limiting plate is directly welded to the crossbeam. During the welding process between the crossbeam and the vehicle body bracket, thermal deformation of the through hole of the crossbeam is inevitable. Since the size of the positioning hole of the limiting plate is smaller than the size of the through hole, there is an overlapping area between the limiting plate and the crossbeam at the edge of the hole. Therefore, after the through hole of the crossbeam is displaced due to thermal deformation, the limiting plate is moved during welding, and the overlapping area is misaligned. Finally, the positioning hole of the limiting plate can be used as a new hole for mounting bolts according to the design requirements, thereby ensuring the position accuracy of the positioning hole.

[0041] When the eccentric bolt is rotated until the farthest edge of the eccentric shim on it abuts against the inner wall of the vertical plate, the position of the eccentric bolt within the positioning hole will move, thereby achieving eccentric adjustment. (Refer to...) Figure 3 and Figure 4 The concave surface and adjustment structure on the crossbeam generally adopt a double-sided symmetrical structure (hexagonal bolt head 31, eccentric washer, limit plate, first concave mounting surface and second concave mounting surface are respectively set at both ends of the eccentric bolt), which has the best adjustment effect. Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A crossbeam eccentric bolt adjustment structure for a vehicle frame, characterized in that, The system includes a through hole in the crossbeam, a limiting plate welded to one side of the through hole, the limiting plate including a base plate welded to the crossbeam, a base plate corresponding to the through hole on the base plate, upright plates installed at both ends of the base plate, an eccentric bolt installed through the through hole and the positioning hole, and an eccentric washer fixedly installed on the eccentric bolt. The area of ​​the positioning hole is smaller than the area of ​​the through hole; When the eccentric bolt is rotated to the point where the farthest edge of the eccentric washer abuts against the inner wall of the vertical plate, the eccentric bolt moves at the position of the positioning hole, thereby achieving eccentric adjustment.

2. The eccentric bolt adjustment structure for a vehicle frame crossbeam according to claim 1, characterized in that, The via and the positioning hole are elongated oval holes with similar shapes. The via includes a rectangular hole with semi-circular holes on both sides. The positioning hole includes a rectangular hole with semi-circular holes on both sides.

3. The eccentric bolt adjustment structure for a vehicle frame crossbeam according to claim 1, characterized in that, The thickness of the upright plate is greater than that of the eccentric shim, ensuring that the eccentric shim is effectively limited.

4. The eccentric bolt adjustment structure for a vehicle frame crossbeam according to claim 1, characterized in that, The crossbeam encloses the front crossbeam, and the front crossbeam has a first concave mounting surface. The first concave mounting surface is a rectangular concave surface with rounded corners. When the limiting surface inside the first concave mounting surface abuts against the eccentric gasket, it further limits the eccentric gasket.

5. The eccentric bolt adjustment structure for a vehicle frame crossbeam according to claim 1, characterized in that, The crossbeam encloses the rear crossbeam, and the rear crossbeam has a second concave mounting surface. The second concave mounting surface is a fan-shaped concave surface. When the limiting surface on the inner side of the second concave mounting surface abuts against the eccentric gasket, it further limits the eccentric gasket.

6. The eccentric bolt adjustment structure for a vehicle frame crossbeam according to claim 1, characterized in that, The vias and positioning holes have an overlapping area in the projection direction towards the ground, and the overlapping area facilitates the adjustment of the hole position.

7. The eccentric bolt adjustment structure for a vehicle frame crossbeam according to claim 1, characterized in that, The inner side of the upright plate is perpendicular to the long axis of the positioning hole.

8. The eccentric bolt adjustment structure for a vehicle frame crossbeam according to claim 1, characterized in that, The length of the substrate is greater than the diameter of the eccentric pad, ensuring that the eccentric pad can rotate freely on the substrate.

9. The eccentric bolt adjustment structure for a vehicle frame crossbeam according to claim 1, characterized in that, The eccentric shim has scale lines along the circumference to facilitate the reference for the rotation angle when adjusting the eccentric shim.

10. The eccentric bolt adjustment structure for a vehicle frame crossbeam according to claim 1, characterized in that, The eccentric bolt has a hexagonal bolt head.

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