Special tool for processing joint fork of rear wheel steering system

Abstract

The utility model provides a special tool for processing a joint fork of a rear wheel steering system, which comprises a bottom plate, a first pressing device, a side pressing device and a stand column are arranged on the bottom plate, a first pressing plate for applying pressing force to the joint fork is arranged on the first pressing device, and a supporting block is arranged at the upper end of the stand column. The upper end face of the supporting block is a supporting positioning face, the side pressing device is connected with a side pressing plate used for applying side pressure to one end of the yoke, the side pressing plate is provided with a shaft hole positioning piece matched with a shaft hole in the yoke, and the shaft hole positioning piece is matched with the shaft hole in the yoke. And a waist-shaped hole positioning piece is arranged on the bottom plate. When the second kidney-shaped hole is machined, the yoke is positioned based on the machined kidney-shaped hole, so that when the next kidney-shaped hole is machined, the next kidney-shaped hole is also machined based on the position of the first kidney-shaped hole, and the relative position precision and the coaxiality between the two kidney-shaped holes can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of tooling and fixture technology, and in particular to a special tooling for machining the fork of a rear wheel steering system. Background Technology

[0002] Rear-wheel steering systems require universal joints, and the joint fork is an important component of the universal joint. One existing joint fork type is as follows: Figure 4 As shown, one end of the fork 1 is provided with a shaft hole 1c, and the two sides of the fork 1 are symmetrically provided with waist-shaped holes 1a, and the two inner sides of the fork 1 are symmetrically provided with flat surfaces 1b. During the processing of the fork 1, the flat surfaces are first machined on the two inner sides of the fork 1 by machining, and then the first waist-shaped hole 1a is machined on one side of the fork 1 by drilling equipment, and then the second waist-shaped hole 1a is machined on the other side of the fork 1.

[0003] However, when machining the second waist-shaped hole after machining the first one, traditional tooling fixtures cannot clamp the fork based on the first waist-shaped hole, making it difficult to guarantee the coaxiality between the second and first waist-shaped holes, thus affecting the machining quality of the waist-shaped holes. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies and provide a special tooling for machining the fork of a rear wheel steering system.

[0005] The purpose of this utility model is achieved through the following technical solution: a special tooling for machining the fork of a rear wheel steering system, comprising a base plate, a first pressing device, a side pressing device, and a column on the base plate; a first pressing plate for applying downward pressure to the fork is provided on the first pressing device; a support block is provided at the upper end of the column, and the upper end surface of the support block is a support positioning surface; a side pressing plate for applying lateral pressure to one end of the fork is connected to the side pressing device; a shaft hole positioning component is provided on the side pressing plate that mates with the shaft hole on the fork; a waist-shaped hole positioning component is provided on the base plate, and the cross-section of the waist-shaped hole positioning component is consistent with the cross-section of the waist-shaped hole on the fork; when positioning the fork, the waist-shaped hole positioning component is inserted into the waist-shaped hole on one side of the fork, and the plane on the other side of the fork contacts the support positioning surface.

[0006] Preferably, the device further includes a second pressing device, which is connected to a second pressing plate for applying downward pressure to the fork; the pressing position of the first pressing plate on the fork is located at the end of one side of the fork, and the pressing position of the second pressing plate on the fork is located at the middle of one side of the fork.

[0007] Preferably, the first pressing device, the side pressing device, and the second pressing device are all hydraulic cylinders, the first pressing device and the second pressing device are both arranged in a vertical direction, and the side pressing device is arranged in a horizontal direction.

[0008] Preferably, the support block is provided with a clearance hole corresponding to the waist-shaped hole on the fork.

[0009] Preferably, the support block is arranged horizontally, and one end of the support block is fixedly connected to the top of the column by connecting bolts.

[0010] Preferably, a fixing block is provided on the base plate, and a waist-shaped hole positioning component is provided on the fixing block.

[0011] Preferably, the fixing block is provided with an insert hole, and the bottom of the waist-shaped hole positioning is embedded in the insert hole, with the waist-shaped hole positioning and the insert hole having an interference fit.

[0012] Preferably, the shaft hole positioning component has a cylindrical structure, and one end of the shaft hole positioning component is provided with a positioning cone surface, which cooperates with one end of the shaft hole.

[0013] Preferably, the base plate is provided with bolt holes and positioning holes.

[0014] The beneficial effects of this utility model are as follows: When fixing the fork section, the side of the fork section requiring the machining of the waist-shaped hole is placed on the support block. The support block provides good support for the side of the fork section requiring machining, preventing this part from being suspended and vibrating during machining, thereby ensuring machining accuracy. When machining the second waist-shaped hole, the fork section is positioned by the waist-shaped hole positioning component cooperating with the already machined waist-shaped hole on the fork section. This positioning method is based on the already machined waist-shaped hole for positioning the fork section. Thus, when machining the subsequent waist-shaped hole, its machining is also based on the position of the first waist-shaped hole, which ensures the relative positional accuracy and coaxiality between the two waist-shaped holes. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model from one direction.

[0016] Figure 2 This is a schematic diagram of the structure from another direction of the present invention.

[0017] Figure 3 This is a schematic diagram of the present invention when clamping the fork.

[0018] Figure 4 This is a schematic diagram of the existing segmented fork structure.

[0019] In the diagram: 1. Fork joint, 1a. Waist-shaped hole, 1b. Flat surface, 1c. Shaft hole, 2. Base plate, 3. Fixing block, 4. Waist-shaped hole positioning piece, 5. Support block, 6. Clearance hole, 7. Column, 8. First pressing device, 9. First pressing plate, 10. Side pressing device, 11. Side pressing plate, 12. Bolt hole, 13. Positioning hole, 14. Second pressing device, 15. Second pressing plate, 16. Connecting bolt, 17. Shaft hole positioning piece, 18. Positioning cone surface. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art are within the protection scope of the present utility model.

[0021] like Figures 1 to 3 As shown, a special tooling for machining the fork of a rear wheel steering system includes a base plate 2. The base plate 2 is equipped with a first pressing device 8, a side pressing device 10, and a column 7. The first pressing device 8 is equipped with a first pressing plate 9 for applying downward pressure to the fork 1. A support block 5 is provided at the upper end of the column 7, and the upper surface of the support block 5 is a support positioning surface. A side pressing plate 11 for applying lateral pressure to one end of the fork 1 is connected to the side pressing device 10. A shaft hole positioning component 17 is provided on the side pressing plate 11, which mates with the shaft hole 1c on the fork 1. The shaft hole positioning component 17 mates with the shaft hole 1c on the fork 1. A waist-shaped hole positioning component 4 is provided on the base plate 2, and the cross-section of the waist-shaped hole positioning component 4 is consistent with the cross-section of the waist-shaped hole 1a on the fork 1. When positioning the fork 1, the waist-shaped hole positioning component 4 is inserted into the waist-shaped hole 1a on one side of the fork 1, and the plane 1b on the other side of the fork 1 contacts the support positioning surface.

[0022] In this invention, when clamping and fixing the fork 1, the waist-shaped hole 1a on one side of the fork 1 has already been machined, and the waist-shaped hole 1a on the other side needs to be machined. The side of the fork requiring the waist-shaped hole 1a is placed on the support block 5, and the plane 1b on that side contacts the support positioning surface at the upper end of the support block 5. Through the cooperation between the support positioning surface and the plane 1b on the fork, the fork 1 is vertically positioned. Simultaneously, when placing the fork 1, the waist-shaped hole positioning piece 4 is inserted into the other side of the fork 1... In the completed waist-shaped hole 1a; the segment fork 1 is positioned by the cooperation between the waist-shaped hole positioning part 4 and the waist-shaped hole 1a; the first lower pressure plate 9 presses the upper end of the segment fork 1 and applies downward pressure to the segment fork 1, and the side pressure plate 11 applies horizontal lateral pressure to one end of the segment fork 1. The first lower pressure plate 9 and the side pressure plate 11 firmly fix the segment fork 1 on the tooling, so that the segment fork 1 remains stable during the processing; the drilling tool is used to drill holes in the segment fork 1, thereby processing the waist-shaped hole 1a in the segment fork 1.

[0023] When fixing the fork section 1, the side of the fork section 1 that needs to have the waist-shaped hole 1a machined is placed on the support block 5. The support block 5 provides good support for the side of the fork section 1 that needs to be machined, preventing this part from being suspended and vibrating during the machining process, thus ensuring machining accuracy. When machining the second waist-shaped hole 1a, the fork section 1 is positioned by the waist-shaped hole positioning component 4 cooperating with the already machined waist-shaped hole 1a on the fork section 1. This positioning method is based on the already machined waist-shaped hole 1a. Thus, when machining the next waist-shaped hole 1a, its machining is also based on the position of the first waist-shaped hole 1a, which can ensure the relative positional accuracy and coaxiality between the two waist-shaped holes 1a. In contrast, traditional clamps do not clamp the fork section 1 based on the position of the first waist-shaped hole 1a, making it difficult to guarantee the coaxiality between the second and first waist-shaped holes 1a.

[0024] This utility model includes a second pressing device 14, on which a second pressing plate 15 is connected for applying downward pressure to the fork 1. The pressing position of the first pressing plate 9 on the fork 1 is located at one end of the fork 1, and the pressing position of the second pressing plate 15 on the fork 1 is located at the middle of one side of the fork 1. The second pressing device 14 works in conjunction with the first pressing device 8 to improve the pressing effect on the fork 1 and effectively reduce the vibration of the fork 1 during processing.

[0025] In this embodiment, the first pressing device 8, the side pressing device 10, and the second pressing device 14 are all hydraulic cylinders. The first pressing device 8 and the second pressing device 14 are both arranged vertically, while the side pressing device 10 is arranged horizontally.

[0026] The support block 5 is provided with a clearance hole 6 corresponding to the waist-shaped hole 1a on the fork 1. The area of ​​the clearance hole 6 is larger than the area of ​​the waist-shaped hole 1a on the fork 1, and is used to avoid the drilling tool during the machining process.

[0027] The support block 5 is set horizontally, and one end of the support block 5 is fixedly connected to the top of the column 7 by connecting bolt 16.

[0028] Furthermore, a fixing block 3 is provided on the base plate 2, and a waist-shaped hole positioning component 4 is provided on the fixing block 3. The fixing block 3 is provided with an insert hole, and the bottom of the waist-shaped hole 1a positioning component is embedded in the insert hole, with the waist-shaped hole 1a positioning component and the insert hole having an interference fit.

[0029] The shaft hole positioning component 17 has a cylindrical structure, and one end of the shaft hole positioning component 17 is provided with a positioning cone surface 18, which mates with one end of the shaft hole 1c. The positioning cone surface 18 is a conical surface, and the positioning cone surface 18 is in tight contact with one end of the shaft hole 1c and applies lateral pressure to the fork 1.

[0030] The base plate 2 is provided with bolt holes 12 and positioning holes 13. The base plate 2 is connected to the mounting table on the processing equipment by bolts, and the bolts pass through the bolt holes 12 on the base plate 2; the positioning holes 13 on the base plate 2 are used to cooperate with the positioning pins on the processing equipment for positioning the base plate 2.

[0031] This utility model is not limited to the above-described preferred embodiments. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made in their shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this utility model.

Claims

1. A special tool for processing of a yoke of a rear wheel steering system, characterized in that, The device includes a base plate, on which are mounted a first pressing device, a side pressing device, and a column. The first pressing device has a first pressing plate for applying downward pressure to the fork. The upper end of the column has a support block, the upper surface of which is a support positioning surface. The side pressing device has a side pressing plate for applying lateral pressure to one end of the fork. The side pressing plate has a shaft hole positioning component that mates with a shaft hole on the fork. The base plate has a waist-shaped hole positioning component with a cross-section that matches the cross-section of the waist-shaped hole on the fork. When positioning the fork, the waist-shaped hole positioning component is inserted into the waist-shaped hole on one side of the fork, and the plane on the other side of the fork contacts the support positioning surface.

2. The special tool for processing the yolk of the rear wheel steering system according to claim 1, characterized in that, It also includes a second pressing device, which is connected to a second pressing plate for applying downward pressure to the fork; the pressing position of the first pressing plate on the fork is located at the end of one side of the fork, and the pressing position of the second pressing plate on the fork is located at the middle of one side of the fork.

3. The special tool for processing the yolk of the rear wheel steering system according to claim 2, characterized in that, The first pressing device, the side pressing device, and the second pressing device are all hydraulic cylinders. The first pressing device and the second pressing device are both arranged in a vertical direction, while the side pressing device is arranged in a horizontal direction.

4. The special tool for processing the yolk of the rear wheel steering system according to claim 1, characterized in that, The support block is provided with clearance holes that correspond to the waist-shaped holes on the fork.

5. The special tool for processing the yolk of the rear wheel steering system according to claim 1, characterized in that, The support block is arranged horizontally, and one end of the support block is fixedly connected to the top of the column by connecting bolts.

6. The special tool for processing the yolk of the rear wheel steering system according to claim 1, characterized in that, A fixing block is provided on the base plate, and a waist-shaped hole positioning component is provided on the fixing block.

7. The special tool for processing the yolk of the rear wheel steering system according to claim 6, characterized in that, The fixing block is provided with an insert hole, and the bottom of the waist-shaped hole positioning is embedded in the insert hole, with the waist-shaped hole positioning and the insert hole having an interference fit.

8. The special tool for processing the yolk of the rear wheel steering system according to claim 1, characterized in that, The shaft hole positioning component has a cylindrical structure, and one end of the shaft hole positioning component is provided with a positioning cone surface, which mates with one end of the shaft hole.

9. The special tool for processing the yolk of the rear wheel steering system according to claim 1, characterized in that, The base plate is provided with bolt holes and positioning holes.

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