Machining clamp for input shaft of automobile steering system

Abstract

The utility model relates to the technical field of automobile input shaft machining, in particular to a machining clamp for an input shaft of an automobile steering system, the machining clamp comprises a base, a first mounting seat and a second mounting seat, the first mounting seat and the second mounting seat are fixed on the base, and a machining area for clamping a workpiece is reserved between the first mounting seat and the second mounting seat. A positioning assembly which extends into a workpiece groove and abuts against one end of a workpiece is arranged on the first mounting seat, a limiting sleeve abutting against the other end of the workpiece is arranged on the second mounting seat, and one end of the limiting sleeve is sunken to form an avoiding groove facilitating machining of a matching surface by a milling machine. According to the machining clamp, the effect of stably clamping a workpiece is achieved, it is guaranteed that the position of the workpiece is fixed in the machining process, and the workpiece can be smoothly machined to form a matching face in the clamping state through the receding groove in the limiting sleeve.

Description

Technical Field

[0001] This application relates to the technical field of machining automotive input shafts, and in particular to a machining fixture for automotive steering system input shafts. Background Technology

[0002] The automotive steering system is a control mechanism used to change the direction of a vehicle's travel. Based on their working principles, automotive steering systems are classified into mechanical steering systems, hydraulic power steering systems, and electric power steering systems. Electric power steering systems use an electric motor to provide auxiliary torque to help the driver perform steering operations.

[0003] like Figure 1 The input shaft shown, also known as the steering shaft, is a key component in the electric power steering system. It is used to connect the steering wheel and the torque sensor, and to transmit the rotation of the steering wheel to the torque sensor. One end of the input shaft 1 is provided with a toothed key 2 that protrudes from the circumferential side of the input shaft 1, and the opposite end is recessed to form a keyway 3. The toothed key 2 and toothed key 3 are evenly distributed along the circumference of the input shaft 1, and the end face of the end where the toothed key 2 is located is recessed to form a groove 4.

[0004] To meet the requirements of the steering system, a mating surface 26 needs to be milled at the keyway 3 of the input shaft 1. However, the existing input shaft 1 does not have a suitable fixture for clamping during milling, which cannot ensure the accuracy of the position of the input shaft 1 during the milling process. Utility Model Content

[0005] To ensure that the input shaft is clamped on the fixture without affecting the machining of the mating surfaces, this application provides a machining fixture for the input shaft of an automotive steering system.

[0006] This application provides a machining fixture for the input shaft of an automotive steering system, which adopts the following technical solution:

[0007] A machining fixture for an input shaft of an automotive steering system includes a base and a first mounting seat and a second mounting seat fixed on the base. A machining area for clamping a workpiece is provided between the first mounting seat and the second mounting seat. A positioning component is provided on the first mounting seat, which extends into a groove of the workpiece and abuts against one end of the workpiece. A limiting sleeve is provided on the second mounting seat, which abuts against the other end of the workpiece. One end of the limiting sleeve is recessed to form a clearance groove to facilitate the machining of the mating surface by a milling machine.

[0008] By adopting the above technical solution, one end of the workpiece is pressed against the positioning component on the first mounting base, and the other end of the workpiece is pressed against the limiting sleeve on the second mounting base, which plays a role in stabilizing the workpiece and ensuring that the position of the workpiece remains fixed during the processing. The clearance groove on the limiting sleeve allows the workpiece to be smoothly processed to form a mating surface in the clamped state.

[0009] Optionally, the positioning assembly includes a positioning rod and a drive source for driving the positioning rod to abut against the workpiece, and the first mounting base is provided with a sliding hole for the positioning rod to slide.

[0010] By adopting the above technical solution, the drive source drives the positioning rod to slide towards the workpiece in the sliding hole until the positioning rod and the workpiece are pressed together, ensuring that the workpiece is stably clamped in the processing area, which facilitates the subsequent processing of the mating surface.

[0011] Optionally, the positioning rod has a centering protrusion that aligns with the workpiece, and the centering protrusion is cone-shaped.

[0012] By adopting the above technical solution, when the positioning rod extends into the groove of the workpiece, the conical centering protrusion plays a guiding and centering role in the process of extending into the groove of the workpiece, thereby facilitating the smooth extension of the positioning rod into the groove of the workpiece.

[0013] Optionally, a limiting key that is adapted to the keyway is formed on the inner wall of the limiting sleeve.

[0014] By adopting the above technical solution, the limiting sleeve is placed on one end of the workpiece, and the limiting key on the inner side wall of the limiting sleeve is adapted to the keyway on the workpiece, which plays a connecting role between the workpiece and the limiting sleeve, ensuring that the workpiece and the limiting sleeve are positioned and aligned, thereby ensuring the accuracy of the position of the workpiece and the limiting sleeve, while preventing the workpiece from rotating in the circumferential direction.

[0015] Optionally, the second mounting base has a through hole for accommodating the limiting sleeve, and the limiting sleeve is fixedly connected to the second mounting base.

[0016] By adopting the above technical solution, the limiting sleeve is fixedly connected in the through hole on the second mounting base. During the process of the positioning rod abutting against one end of the workpiece, the limiting sleeve abutting against the other end of the workpiece, restricting the movement of the workpiece and ensuring that the workpiece remains in a stable position during the machining of the mating surface.

[0017] Optionally, a limiting protrusion is formed on the outer peripheral side of the limiting sleeve and is arranged along the axial direction of the limiting sleeve. The second mounting base is provided with a positioning groove that is interference-fitted with the limiting protrusion, and the positioning groove is connected to the through hole.

[0018] By adopting the above technical solution, when the limiting sleeve passes through the through hole, the limiting protrusion on the limiting sleeve and the positioning groove are interference-fitted, thereby fixing the limiting sleeve to the second mounting base. This achieves accurate positioning of the limiting sleeve and the second mounting base, ensures the accuracy of the relative position of the clearance groove on the limiting sleeve and the workpiece, and further ensures the accuracy of the position of the mating surface of the workpiece. The positioning groove and the through hole are connected, ensuring that the limiting sleeve can be smoothly placed on the workpiece.

[0019] Optionally, the base is provided with a plurality of mounting holes for adjusting the distance between the first mounting seat and the second mounting seat. The mounting holes are internally threaded with locking components, and the first mounting seat and the second mounting seat are fixed to the base by the locking components.

[0020] By adopting the above technical solution and setting multiple locking components and mounting holes, the distance between the first mounting base and the second mounting base can be flexibly adjusted to meet the clamping requirements of the machining fixture for workpieces of different lengths, thereby improving the applicability and flexibility of the machining fixture.

[0021] Optionally, multiple positioning components and limiting sleeves are provided, and their positions correspond one-to-one.

[0022] By adopting the above technical solution, multiple workpieces can be clamped simultaneously, thereby significantly improving processing efficiency.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. One end of the workpiece is pressed against the positioning component on the first mounting base, and the other end of the workpiece is pressed against the limiting sleeve on the second mounting base, which plays a role in stabilizing the workpiece and ensuring that the position of the workpiece remains fixed during the processing. The clearance groove on the limiting sleeve allows the workpiece to be smoothly processed to form a mating surface in the clamped state.

[0025] 2. When the positioning rod extends into the groove of the workpiece, the conical centering protrusion plays a guiding and centering role during the process of extending into the groove of the workpiece, thus facilitating the smooth extension of the positioning rod into the groove of the workpiece.

[0026] 3. The limiting protrusion on the limiting sleeve is interference-fitted with the positioning groove, thereby fixing the limiting sleeve to the second mounting base. This achieves accurate positioning of the limiting sleeve and the second mounting base, ensuring the accuracy of the relative position between the clearance groove on the limiting sleeve and the workpiece, and thus ensuring the accuracy of the position of the mating surface of the workpiece. The positioning groove is connected to the through hole, ensuring that the limiting sleeve can be smoothly placed on the workpiece. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the input shaft.

[0028] Figure 2 This is a schematic diagram of the structure of an embodiment of this application;

[0029] Figure 3 This is a partial explosion diagram of an embodiment of this application.

[0030] Reference numerals: 1. Input shaft; 2. Gear key; 3. Keyway; 4. Groove; 5. Machining fixture; 6. Base; 7. First mounting seat; 8. Second mounting seat; 9. Working area; 10. Positioning assembly; 11. Limiting sleeve; 12. Clearance groove; 13. Positioning rod; 14. Hydraulic cylinder; 15. Sliding hole; 16. Centering protrusion; 17. Limiting key; 18. Through hole; 19. Limiting protrusion; 20. Positioning groove; 21. Round hole; 22. Locking assembly; 23. Threaded hole; 24. Bolt; 25. Nut; 26. Mating surface. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0032] Example:

[0033] A machining fixture for an input shaft of an automotive steering system, reference Figure 1 and Figure 2 The machining fixture 5 includes a base 6, a first mounting base 7, and a second mounting base 8. The base 6 provides stable support for the entire machining fixture 5. The first mounting base 7 and the second mounting base 8 are disposed on the surface of the base 6. The cross-sectional shape of the first mounting base 7 and the second mounting base 8 along the height direction of the machining fixture 5 is inverted T-shaped, which improves the stability of the first mounting base 7 and the second mounting base 8 on the base 6. A certain space is left between the first mounting base 7 and the second mounting base 8 to form a working area 9 specifically for clamping the input shaft 1 and subsequent milling. A positioning component 10 is provided on the first mounting base 7. A groove 4 is located at one end of the input shaft 1. The positioning component 10 can extend into the groove 4 of the input shaft 1 and be aligned with the input shaft 1. The two mounting bases are tightly fitted together, which effectively improves the positioning accuracy of the input shaft 1. A limiting sleeve 11 is fixed on the second mounting base 8. The limiting sleeve 11 is placed on the other end of the input shaft 1 and abuts against the input shaft 1. The first mounting base 7 and the second mounting base 8 abut against the two ends of the input shaft 1 respectively. The input shaft 1 is clamped in the working area 9 between the two, so that the input shaft 1 can be stably positioned and fixed, thereby ensuring that the input shaft 1 remains stable during the processing. The end of the limiting sleeve 11 near the input shaft 1 is recessed to form a relief groove 12, which facilitates the milling machine to process the mating surface 26 during the processing, making it easier for the milling machine to perform milling, improving processing efficiency, and ensuring the processing accuracy of the mating surface 26.

[0034] refer to Figure 2 and Figure 3The positioning component 10 includes a positioning rod 13 and a drive source. In this embodiment, the drive source is a hydraulic cylinder 14. The output shaft of the hydraulic cylinder 14 is fixedly connected to one end of the positioning rod 13 by welding. After the hydraulic cylinder 14 works, the output shaft of the hydraulic cylinder 14 drives the positioning rod 13. A sliding hole 15 is provided on the first mounting base 7. The size and shape of the sliding hole 15 are adapted to the positioning rod 13 and the position is opposite, so that the positioning rod 13 can slide smoothly in the sliding hole 15, thereby driving the positioning rod 13 to abut against the input shaft 1. After the input shaft 1 is processed, the output shaft of the hydraulic cylinder 14 drives the positioning rod 13 to retract. The positioning rod 13 extends out from the groove 4 of the input shaft 1, making it easy to remove the input shaft 1 from the processing fixture 5.

[0035] refer to Figure 3 The end of the positioning rod 13 that abuts against the input shaft 1 has a centering protrusion 16. The centering protrusion 16 is cone-shaped. The centering protrusion 16 facilitates the centering of the positioning rod 13 and the input shaft 1, ensuring that the positioning rod 13 accurately extends into the groove 4 of the input shaft 1, which facilitates the subsequent machining of the mating surface 26. The groove 4 has an annular step. When the positioning rod 13 extends into the groove 4 and abuts against the step, the force exerted on the input shaft 1 by the centering protrusion 16 is more even, avoiding deformation or damage to the input shaft 1 due to excessive local force.

[0036] refer to Figure 1 and Figure 3 A limiting key 17 protrudes from the inner wall of the limiting sleeve 11. The limiting key 17 is adapted to the size and shape of the keyway 3 at one end of the input shaft 1 and is positioned accordingly, which improves the stability of the input shaft 1 and the limiting sleeve 11. After the limiting sleeve 11 is placed on the input shaft 1, the limiting key 17 and the keyway 3 are interference-fitted to realize the fixed connection between the limiting sleeve 11 and the input shaft 1, preventing the input shaft 1 from rotating around the circumference of the limiting sleeve 11. The limiting sleeve 11 has an annular step inside. The input shaft 1 abuts against the step inside the limiting sleeve 11, ensuring that the input shaft 1 will not loosen or fall off during the process of being pressed by the positioning rod 13 and during the processing of the input shaft 1.

[0037] refer to Figure 3The second mounting base 8 has a through hole 18 for placing the limiting sleeve 11. The through hole 18 is opposite to the sliding hole 15 to ensure the accuracy of the clamped input shaft 1 position. The through hole 18 is adapted to the size and shape of the limiting sleeve 11. A limiting protrusion 19 is formed on the outer periphery of the limiting sleeve 11 and is arranged along the axial direction of the limiting sleeve 11. The second mounting base 8 also has a positioning groove 20 opposite to the limiting protrusion 19. The limiting protrusion 19 and the positioning groove 20 are interference fit. The size of the limiting protrusion 19 is slightly larger than the size of the positioning groove 20. The limiting sleeve 11 is fixedly connected to the second mounting base 8. The limiting protrusion 19 also realizes the accurate positioning of the limiting sleeve 11 and the second mounting base 8, ensuring the accuracy of the processing position of the input shaft 1. The positioning groove 20 is connected to the through hole 18 to ensure that the limiting sleeve 11 can be smoothly placed on the input shaft 1.

[0038] refer to Figure 2 and Figure 3 The base 6 has mounting holes, and the bottom of the first mounting seat 7 and the second mounting seat 8 have round holes 21. A locking assembly 22 is threaded into the mounting holes. In this embodiment, the mounting holes are threaded holes 23. The locking assembly 22 includes a bolt 24 and a nut 25. The bolt 24 passes through the base 6 and the first mounting seat 7 and is threadedly connected to the nut 25, fixing the first mounting seat 7 to the base 6. The bolt 24 passes through the base 6 and the second mounting seat 8 and is threadedly connected to the nut 25, thereby fixing the second mounting seat 8 to the base 6. Multiple threaded holes 23 are provided along the long side of the base 6. The machining fixture 5... When clamping input shafts 1 of different lengths, the first mounting base 7 and the second mounting base 8 can be adjusted to the corresponding threaded holes 23, thereby adjusting the distance between the first mounting base 7 and the second mounting base 8 to clamp input shafts 1 of different lengths. Multiple sliding holes 15 on the first mounting base 7 and through holes 18 on the second mounting base 8 are provided. The positions of the sliding holes 15 and the through holes 18 correspond one-to-one. A positioning component 10 is installed in each sliding hole 15, and a limiting sleeve 11 is installed in each through hole 18, so that the machining fixture 5 can clamp multiple input shafts 1 at the same time, improving the clamping efficiency of the machining fixture 5.

[0039] The implementation principle of this application embodiment is as follows: During the clamping process of the input shaft 1, the hydraulic cylinder 14 drives the output shaft to press the positioning rod 13. The positioning rod 13 slides along the sliding hole 15 on the second mounting seat 8. The positioning rod 13 extends into the groove 4 of the input shaft 1 and abuts against the input shaft 1. The other end of the input shaft 1 extends into the limiting sleeve 11. The limiting protrusion 19 on the outer periphery of the limiting sleeve 11 is press-fitted with the positioning groove 20 to achieve a fixed connection between the limiting sleeve 11 and the second mounting seat 8. The limiting key 17 on the inner side wall of the limiting sleeve 11 is press-fitted with the keyway 3 to achieve a fixed connection between the input shaft 1 and the limiting sleeve 11. At the same time, it restricts the input shaft 1 from rotating upward along the circumference of the limiting sleeve 11. The first mounting base 7 and the second mounting base 8 are provided with multiple positioning components 10 and limiting sleeves 11, which can realize the simultaneous clamping of multiple tools. If it is necessary to clamp input shafts 1 of different lengths, the first mounting base 7 and the second mounting base 8 can be replaced with the corresponding mounting holes. Then, the first mounting base 7 and the second mounting base 8 are fixed on the base 6 using bolts 24 and nuts 25. After adjusting the distance between the first mounting base 7 and the second mounting base 8 and machining the mating surface 26, the hydraulic cylinder 14 drives the positioning rod 13 away from the input shaft 1, and the input shaft 1 can be easily removed.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A machining fixture for an input shaft of an automotive steering system, characterized in that: The machining fixture (5) includes a base (6) and a first mounting seat (7) and a second mounting seat (8) fixed on the base (6). A machining area for clamping the workpiece is left between the first mounting seat (7) and the second mounting seat (8). The first mounting seat (7) is provided with a positioning component (10) that extends into the groove (4) of the workpiece and abuts against one end of the workpiece. The second mounting seat (8) is provided with a limiting sleeve (11) that abuts against the other end of the workpiece. One end of the limiting sleeve (11) is recessed to form a relief groove (12) that facilitates the milling of the mating surface (26).

2. The machining fixture for an input shaft of an automotive steering system according to claim 1, characterized in that: The positioning component (10) includes a positioning rod (13) and a driving source for driving the positioning rod (13) to abut against the workpiece. The first mounting base (7) is provided with a sliding hole (15) for the positioning rod (13) to slide.

3. A machining fixture for an input shaft of an automotive steering system according to claim 2, characterized in that: The positioning rod (13) has a centering protrusion (16) that aligns with the workpiece, and the centering protrusion (16) is cone-shaped.

4. A machining fixture for an input shaft of an automotive steering system according to claim 1, characterized in that: The inner wall of the limiting sleeve (11) has a protruding limiting key (17) that is adapted to the keyway (3).

5. A machining fixture for an input shaft of an automotive steering system according to claim 4, characterized in that: The second mounting base (8) has a through hole (18) for accommodating the limiting sleeve (11), and the limiting sleeve (11) is fixedly connected to the second mounting base (8).

6. A machining fixture for an input shaft of an automotive steering system according to claim 5, characterized in that: The outer periphery of the limiting sleeve (11) has a limiting protrusion (19) that is arranged along the axial direction of the limiting sleeve (11). The second mounting base (8) has a positioning groove (20) that is interference-fitted with the limiting protrusion (19). The positioning groove (20) is connected to the through hole (18).

7. A machining fixture for an input shaft of an automotive steering system according to claim 1, characterized in that: The base (6) is provided with a plurality of mounting holes for adjusting the distance between the first mounting seat (7) and the second mounting seat (8). The mounting holes are threaded with locking components (22), and the first mounting seat (7) and the second mounting seat (8) are fixed to the base (6) by the locking components (22).

8. A machining fixture for an input shaft of an automotive steering system according to claim 1, characterized in that: The positioning component (10) and the limiting sleeve (11) are provided in multiple ways and their positions correspond one-to-one.

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