High-precision and rapid positioning fixture for crankshaft hobbing machining

Abstract

The present application relates to hobbing processing technical field, specifically to a kind of high-precision quick positioning fixture for crankshaft hobbing processing, the position of crankshaft can be quickly positioned in the form of interlocking by the bottom matching groove and shaft body matching groove located in the positioning seat, then the crankshaft is fixed using the plug-in limiting rod, and then it is clamped to power chuck, so that power chuck and hob rotate synchronously, and the spline to be processed can contact with hob at a specific starting position.The positioning fixture can provide interlocking through the bottom matching groove and shaft body matching groove, and only needs to place the crankshaft correctly to quickly position and clamp, and then through the slider and the first contact switch, it can ensure that the hob contacts the spline position to be processed at the correct angle, thereby ensuring the accuracy of hobbing starting position. Through the extrusion rod and the jacking rod, the operator can better identify whether the crankshaft is correctly clamped, so that the clamping error problem can be found and solved in time.

Description

Technical Field

[0001] This invention relates to the field of gear hobbing technology, specifically a high-precision, fast-positioning fixture for gear hobbing of crankshafts. Background Technology

[0002] A crankshaft is a type of crankshaft that converts motion between rotational and linear motion. Crankshafts are typically installed using splines. To ensure the correct mounting position of the crankshaft after spline connection, specific teeth on the spline must form a designated angle with the eccentric wheel on the crankshaft. Therefore, precise positioning of these specific teeth is necessary during the hobbing process of the spline.

[0003] Patent CN218903856U discloses a phase alignment device for crankshaft gear hobbing, which can perform phase alignment through form-locking. However, when the device has multiple eccentric positions, it is difficult to avoid mis-clamping at different eccentric positions, causing errors. Therefore, operators need to repeatedly adjust the rotation angle of the workpiece and perform correction and confirmation, resulting in low positioning and clamping efficiency. Moreover, it cannot guarantee that the hob contacts the workpiece at a specific position, leading to a decrease in machining accuracy after the initial machining position is incorrect.

[0004] Therefore, it is difficult to meet the requirements for high-precision and rapid positioning of crankshafts. In view of this, this application provides a high-precision and rapid positioning fixture for crankshaft gear hobbing. Summary of the Invention

[0005] This invention provides the following technical solution: a high-precision, fast-positioning fixture for hobbing crankshafts, comprising a frame, on which a hob for hobbing crankshafts is mounted, and the crankshaft includes a spline to be machined, an eccentric wheel, and a circular wheel integrally formed on a central shaft. The frame is equipped with a movable frame for moving between a machining station, a waiting station, and a loading station, and a power chuck for clamping the central shaft is driven by a first rotary motor on the movable frame. The frame is driven by a lifting push rod to a positioning seat for positioning the crankshaft, and the positioning seat has a bottom mating groove for accommodating the eccentric wheel and the circular wheel. The base is provided with a shaft fitting groove for accommodating the central shaft. The positioning base is fitted with an insertion limiting rod for limiting and clamping the central shaft at the shaft fitting groove. The end of the insertion limiting rod is provided with a guide slope for guiding the central shaft to squeeze and push the insertion limiting rod so as to slide into the shaft fitting groove. The end of the insertion limiting rod is connected to a top block through a push plate. An insertion rod is fixed on the moving frame for squeezing the top block so as to disengage the insertion limiting rod from the clamping state of the central shaft. The push plate is connected to the positioning base through a second return spring. A controller is fixed on the frame and is electrically connected to the lifting push rod, the power chuck and the first rotary motor respectively.

[0006] Preferably, a first lead screw motor is fixedly installed on the frame, and the first lead screw motor is used to drive the moving seat to move back and forth along the frame via the lead screw. A second lead screw motor is fixedly installed on the moving seat, and the second lead screw motor is used to drive the moving frame to move left and right along the moving seat via the lead screw. The first lead screw motor and the second lead screw motor are used together to drive the moving frame to move between the processing station, the waiting station and the loading station. Both the first lead screw motor and the second lead screw motor are electrically connected to the controller.

[0007] Preferably, a second rotary motor is fixedly installed on the top of the frame, and the output end of the second rotary motor drives the hob to rotate through a drive rod. An angle sensor for detecting the rotation angle of the drive rod is fixedly installed on the top of the frame, and both the second rotary motor and the angle sensor are electrically connected to the controller.

[0008] Preferably, a mating notch is provided at the bottom edge of the drive rod, and a connecting rod is fixed to the end of the lifting push rod. A slider that slides in cooperation with the mating notch is fixed to the end of the connecting rod, and a first contact switch for detecting whether the slider collides with the bottom of the drive rod is fixedly installed on the slider. The first contact switch is electrically connected to the controller.

[0009] Preferably, the bottom of the frame is provided with a discharge hole for discharging cutting waste, and the frame is provided with an inclined guide plate for guiding the cutting waste into the discharge hole. The inclined guide plate is located above the slider and is used to prevent the cutting waste from interfering with the normal cooperation between the slider and the discharge hole.

[0010] Preferably, the end of the insertion rod is provided with a plug-in mating slope, and the top block is provided with a top mating slope that mates with the plug-in mating slope.

[0011] Preferably, a lifting rod for lifting the crankshaft is inserted and installed at the bottom of the bottom mating groove in the area corresponding to the circular wheel, and the lifting rod is connected to the positioning seat through a first return spring.

[0012] Preferably, the bottom of the bottom mating groove is fitted with a pressing rod for pressing the eccentric wheel at the bottom of the corresponding eccentric wheel, and a push frame is fixedly installed at the bottom of the pressing rod. The push frame is connected to the positioning seat by a third return spring, and a limit block is fixed at the top of the push frame for inserting between the push plate and the positioning seat, thereby preventing the insertion limit rod from jamming the central shaft.

[0013] Preferably, the push plate is fixedly installed to contact the positioning seat, thereby detecting whether the insertion limit rod is correctly engaged with the second contact switch above the central shaft, and the second contact switch is electrically connected to the controller.

[0014] Compared with the prior art, the advantages of the high-precision and rapid positioning fixture for crankshaft hobbing of the present invention are: 1. The form-locking provided by the bottom mating groove and the shaft mating groove allows for quick positioning and clamping of the crankshaft simply by placing it correctly. If it is not placed correctly, it cannot be inserted, thus avoiding the risk of mis-clamping and improving clamping efficiency.

[0015] 2. The slider and the first contact switch ensure that the hob contacts the spline to be machined at the correct angle, thus ensuring the accuracy of the hobbing starting position and avoiding machining errors caused by incorrect synchronous rotation of the hob and the crankshaft.

[0016] 3. The pressing rod and lifting rod enable operators to better identify whether the crankshaft is correctly clamped, thereby enabling timely detection and resolution of clamping errors and effectively improving the yield rate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a schematic diagram of the frame structure in this invention; Figure 4 This is a schematic diagram of the crankshaft structure in this invention; Figure 5 This is a schematic diagram of the installation of the power chuck and the moving frame in this invention; Figure 6 This is a schematic diagram of the installation of the slider and the lifting push rod in this invention; Figure 7 This is a schematic diagram of the internal structure of the positioning seat in this invention; Figure 8 This is a side view of the positioning seat in this invention; Figure 9 This is a cross-sectional view of the positioning seat in this invention.

[0018] In the diagram: 1. Frame; 2. Crankshaft; 201. Central shaft; 202. Spline to be machined; 203. Eccentric wheel; 204. Round wheel; 3. Insertion rod; 4. Power chuck; 5. Plug-in mating inclined surface; 6. First rotary motor; 7. Moving frame; 8. Second lead screw motor; 9. Moving seat; 10. Lifting push rod; 11. Connecting rod; 12. First contact switch; 13. Slider; 14. Bottom mating groove; 15. First return spring; 16. Positioning seat; 17. Top block; 18. ... 19. Second return spring; 20. Insertion limit rod; 21. Guide slope; 22. Shaft mating groove; 23. Extrusion rod; 24. Push plate; 25. Lifting rod; 26. Third return spring; 27. Push frame; 28. Limit block; 29. ​​Top mating slope; 30. Second rotary motor; 31. Hob; 32. Drive rod; 33. Inclined guide plate; 34. Discharge hole; 35. Mating notch; 36. First lead screw motor; 37. Controller; 38. Angle sensor. Detailed Implementation

[0019] To clearly and completely describe the objectives and technical solutions of this invention, and to more clearly illustrate its advantages, the embodiments of this invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this invention, and are merely used to explain the embodiments of this invention. They are not intended to limit the embodiments of this invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0020] Example 1: Please refer to Figures 1 to 5This invention provides a high-precision, fast-positioning fixture for hobbing crankshafts, comprising a frame 1, a controller 37 fixedly mounted on the frame 1, a hob 31 for hobbing crankshafts 2 on the frame 1, a second rotary motor 30 fixedly mounted on the top of the frame 1, and the output end of the second rotary motor 30 driving the hob 31 to rotate via a drive rod 32. An angle sensor 38 fixedly mounted on the top of the frame 1 for detecting the rotation angle of the drive rod 32 is used to monitor the rotation angle of the hob 31. Under the control of the controller 37, the hob 31 can automatically reset before each machining operation, thus ensuring that the hob 31 contacts the spline 202 to be machined at a specified position each time it is machined, thereby eliminating machining deviations caused by different contact positions of the hob 31 and further ensuring machining accuracy. The crankshaft 2 includes a spline 202 to be processed, an eccentric wheel 203, and a circular wheel 204 integrally formed on the central shaft 201. A first lead screw motor 36 is fixedly installed on the frame 1, and the first lead screw motor 36 is used to drive the moving seat 9 to move back and forth along the frame 1 through the lead screw. A second lead screw motor 8 is fixedly installed on the moving seat 9, and the second lead screw motor 8 is used to drive the moving frame 7 to move left and right along the moving seat 9 through the lead screw. The first lead screw motor 36 and the second lead screw motor 8 are used to jointly drive the moving frame 7 to move between the processing station, the waiting station, and the loading station. The first lead screw motor 36 and the second lead screw motor 8 are both electrically connected to the controller 37. The moving frame 7 is driven by the first rotary motor 6 to drive the power chuck 4 for clamping the central shaft 201. The second rotary motor 30 and the angle sensor 38 are both electrically connected to the controller 37. When the moving frame 7 is in the processing station, the hob 31 can be used to perform hobbing on the spline 202 to be processed. When the moving frame 7 is in the waiting station, the crankshaft 2 can be easily transported to the loading station by the positioning seat 16. When the moving frame 7 moves to the loading station, the power chuck 4 can easily clamp the crankshaft 2.

[0021] Please see Figures 1 to 9The frame 1 is driven by the lifting push rod 10 to position the crankshaft 2. The positioning seat 16 is provided with a bottom mating groove 14 for accommodating the eccentric wheel 203 and the circular wheel 204, and a shaft mating groove 22 for accommodating the central shaft 201. The bottom mating groove 14 and the shaft mating groove 22 can restrict the movement of the crankshaft 2 forward, backward, left, right and downward, and can also completely restrict the rotational movement of the crankshaft 2, thereby achieving precise installation of the crankshaft 2 and automatic positioning. The positioning seat 16 is fitted with a locking rod 20 at the shaft body mating groove 22 for limiting and clamping the central shaft 201. The end of the locking rod 20 is provided with a guide slope 21 for guiding the central shaft 201 to squeeze and push the locking rod 20 into the shaft body mating groove 22. The operator places the crankshaft 2 into the bottom mating groove 14 and the shaft body mating groove 22 from above the positioning seat 16. Only when the crankshaft 2 is correctly positioned can the eccentric wheel 203 correctly enter the bottom mating groove 14. At this time, the central shaft 201 can enter the bottom of the shaft body mating groove 22, and thus the position of the central shaft 201 is restricted by the locking rod 20, preventing the central shaft 201 from moving upward and achieving complete fixation of the crankshaft 2. The end of the insertion limiting rod 20 is connected to a top block 17 via a push plate 24, and an insertion rod 3 is fixed on the moving frame 7 to press the top block 17, thereby disengaging the insertion limiting rod 20 from the clamped state of the central shaft 201. The end of the insertion rod 3 is provided with an insertion mating slope 5, and the top block 17 is provided with a top mating slope 29 that mates with the insertion mating slope 5. The push plate 24 is connected to the positioning seat 16 via a second return spring 19. When the power chuck 4 moves from the waiting station to the middle loading station, the insertion rod 3 will press the top block 17, thereby causing the insertion mating slope 5 and the top mating slope 29 to press against each other, thus allowing the material to pass through. The component force generated by the extrusion pulls the insertion limiting rod 20 outward, causing it to slide out of the shaft mating groove 22. This releases the limiting effect of the insertion limiting rod 20 on the crankshaft 2. Subsequently, the power chuck 4 clamps the central shaft 201, and then the lifting push rod 10 drives the positioning seat 16 to move downward to the non-working position, thus transferring the crankshaft 2 onto the power chuck 4. At this time, the eccentric wheel 203 on the crankshaft 2 will face the hob 31 at a specified angle. When the power chuck 4 and the hob 31 rotate synchronously, it can be ensured that the hob 31 performs hobbing at the specified position on the spline 202 to be processed, thereby ensuring the processing accuracy.A controller 37 is fixed on the frame 1, and the controller 37 is electrically connected to the lifting push rod 10, the power chuck 4 and the first rotary motor 6 respectively. A push plate 24 is fixedly installed to contact the positioning seat 16, thereby detecting whether the insertion limit rod 20 is correctly engaged in the second contact switch 18 above the central shaft 201. The second contact switch 18 is electrically connected to the controller 37. When the insertion limit rod 20 correctly enters the limit position of the central shaft 201, the second contact switch 18 will contact the positioning seat 16. At this time, the controller 37 will remind the operator to complete the clamping by sounding a buzzer. During the process of the crankshaft 2 being pressed into the bottom mating groove 14 and the shaft mating groove 22, the central shaft 201 will first press the guide ramp 21, thereby using the guide ramp 21 to generate a force that pushes the insertion limiting rod 20 outward, causing the insertion limiting rod 20 to slide out of the shaft mating groove 22. In this way, as long as the crankshaft 2 is positioned correctly, the central shaft 201 can fall correctly into the bottom of the shaft mating groove 22. Subsequently, the insertion limiting rod 20 loses the pressing force from the central shaft 201, and the insertion limiting rod 20 can re-enter the shaft mating groove 22 under the compression of the second return spring 19. In this way, the insertion limiting rod 20 can be used to hold the top of the central shaft 201.

[0022] Working principle: When the device is in use, the moving frame 7 is first transported to the waiting position by the first lead screw motor 36 and the second lead screw motor 8. Then, the positioning seat 16 is lifted by the lifting push rod 10 to a position coaxial with the power chuck 4. Then, the operator places the crankshaft 2 into the bottom mating groove 14 and the shaft mating groove 22. When the insertion limit rod 20 is correctly locked above the central shaft 201, it indicates that the crankshaft 2 is correctly positioned and clamped. Subsequently, the power chuck 4 is driven into the loading position by the first lead screw motor 36 and the second lead screw motor 8. During this process, the insertion rod 3 pushes open the insertion limit rod 20, so that it no longer limits the central shaft 201. Then, the power chuck 4 clamps the central shaft 201, and the positioning seat 16 is pulled back to the non-working position by the lifting push rod 10. Subsequently, the power chuck 4 is transported to the machining station, and the power chuck 4 and the hob 31 rotate synchronously to perform gear hobbing. This allows for precise machining starting from a specified angle on the spline 202 to be machined. During machining, the operator can continue to install the crankshaft 2 onto the positioning seat 16. After machining is completed, the crankshaft 2 on the power chuck 4 is removed by the operator, and then the power chuck 4 moves to the waiting station. Subsequently, the positioning seat 16 is pushed by the lifting push rod 10 to a position coaxial with the power chuck 4. Then, under the control of the controller 37, the power chuck 4 automatically completes the clamping operation of the crankshaft 2 on the positioning seat 16. During the above operation, the user only needs to correctly place the crankshaft 2 into the positioning seat 16 to complete the precise positioning and clamping of the crankshaft 2. The operation is convenient, fast and highly accurate. Subsequently, the power chuck 4 will automatically change the clamp under the control of the controller 37 and move the crankshaft 2 into the machining station with the hob 31 facing a specific position. This ensures that the hob 31 performs gear hobbing with the specified position on the spline 202 to be machined as the starting point, thereby ensuring the machining accuracy.

[0023] Example 2: Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 6Based on Embodiment 1, a mating notch 35 is provided at the bottom edge of the drive rod 32, and a connecting rod 11 is fixed to the end of the lifting push rod 10. A slider 13 that slides in cooperation with the mating notch 35 is fixed to the end of the connecting rod 11, and a first contact switch 12 for detecting whether the slider 13 collides with the bottom of the drive rod 32 is fixedly installed on the slider 13. The first contact switch 12 is electrically connected to the controller 37. A discharge hole 34 for discharging cutting waste is provided at the bottom of the frame 1, and an inclined guide plate 33 for guiding the cutting waste into the discharge hole 34 is provided on the frame 1. The inclined guide plate 33 is positioned above the slider 13 and is used to prevent cutting waste from entering the discharge hole 34. The interference with the normal engagement between the slider 13 and the discharge hole 34 is caused by the positioning seat 16 moving upward under the push of the lifting push rod 10. If the first contact switch 12 is triggered, it indicates that the hob 31 has not been correctly zeroed at the rotation angle. At this time, the lifting push rod 10 stops rising and sends a fault signal to the operator through the controller 37. If the first contact switch 12 is not triggered, it indicates that the hob 31 has been correctly zeroed by the second rotary motor 30 after completing one hobbing operation. This ensures that the hob 31 can contact the spline 202 to be processed at the correct position when it rotates synchronously with the power chuck 4 in the future, thereby further ensuring the processing accuracy.

[0024] Example 3: Please refer to Figures 7 to 9Based on Embodiment 2, a lifting rod 25 for lifting the crankshaft 2 is inserted and installed at the bottom of the bottom mating groove 14 in the area corresponding to the circular wheel 204. The lifting rod 25 is connected to the positioning seat 16 through the first return spring 15. A pressing rod 23 for pressing the eccentric wheel 203 is inserted and installed at the bottom of the bottom mating groove 14 in the area corresponding to the eccentric wheel 203. A push frame 27 is fixedly installed at the bottom of the pressing rod 23. The push frame 27 is connected to the positioning seat 16 through the third return spring 26. A limiting block 28 for inserting between the push plate 24 and the positioning seat 16 is fixed at the top of the push frame 27 to prevent the insertion limiting rod 20 from jamming the central shaft 201. When the central shaft 201 fails to fall correctly into the bottom of the shaft body mating groove 22, the insertion limiting rod 20 will not be able to lock above the central shaft 201. Subsequently, the crankshaft 2 will be lifted up under the combined pressure of the first return spring 15 and the lifting rod 25, resulting in a significant positional deviation. The operator can use this positional deviation to determine whether the crankshaft 2 is correctly installed and make timely corrections. If the crankshaft 2 is designed with only one eccentric wheel 203, and the bottom mating groove 14 is mated with the eccentric direction of the eccentric wheel 203, but the operator installs the eccentric wheel 203 with the eccentric direction facing upwards, the central shaft 201 can still fall into the shaft body mating groove 22, but the pressing rod 23 is not pressed by the eccentric wheel 203. Therefore, the limiting block 28 will prevent the insertion limiting rod 20 from resetting. Specifically, after the central shaft 201 presses the insertion limiting rod 20 outward, the limiting block 28, driven by the third return spring 26, enters between the push plate 24 and the positioning seat 16, thereby restricting the reset of the insertion limiting rod 20. If the eccentric wheel 203 does not press the pressing rod 23 downward to disengage the limiting block 28 from the limiting position, the insertion limiting rod 20 will not be able to reset, causing the crankshaft 2 to be pushed out by the lifting rod 25. The operator can then correct the error in time. This method can further avoid misoperation during processing and improve processing accuracy and yield.

[0025] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.

Claims

1. A high-precision, rapid positioning fixture for hobbing crankshafts, comprising a frame (1), wherein the frame (1) is provided with a hob (31) for hobbing crankshafts (2), and the crankshaft (2) comprises a spline (202) to be machined, an eccentric wheel (203) and a circular wheel (204) integrally formed on a central shaft (201), characterized in that: The frame (1) is provided with a movable frame (7) for moving between the processing station, the waiting station and the loading station, and the movable frame (7) is driven by a first rotary motor (6) to clamp the central shaft (201). The frame (1) is driven by a lifting push rod (10) to a positioning seat (16) for positioning the crankshaft (2), and the positioning seat (16) is provided with a bottom mating groove (14) for accommodating the eccentric wheel (203) and the round wheel (204), and the positioning seat (16) is provided with a shaft mating groove (22) for accommodating the central shaft (201). The positioning seat (16) is inserted and installed at the shaft mating groove (22) to limit and clamp the central shaft (201). 20), and the end of the insertion limiting rod (20) is provided with a guide slope (21) for guiding the central shaft (201) to squeeze and push the insertion limiting rod (20) so as to slide into the shaft body mating groove (22). The end of the insertion limiting rod (20) is connected to a top block (17) through a push plate (24), and an insertion rod (3) is fixed on the moving frame (7) for squeezing the top block (17) so as to disengage the insertion limiting rod (20) from the clamping state of the central shaft (201). The push plate (24) is connected to the positioning seat (16) through a second reset spring (19). A controller (37) is fixed on the frame (1), and the controller (37) is electrically connected to the lifting push rod (10), the power chuck (4) and the first rotary motor (6) respectively.

2. The high-precision, rapid positioning fixture for crankshaft gear hobbing according to claim 1, characterized in that: A first lead screw motor (36) is fixedly installed on the frame (1), and the first lead screw motor (36) is used to drive the moving seat (9) to move back and forth along the frame (1) via the lead screw. A second lead screw motor (8) is fixedly installed on the moving seat (9), and the second lead screw motor (8) is used to drive the moving frame (7) to move left and right along the moving seat (9) via the lead screw. The first lead screw motor (36) and the second lead screw motor (8) are used to jointly drive the moving frame (7) to move between the processing station, the waiting station and the loading station. The first lead screw motor (36) and the second lead screw motor (8) are both electrically connected to the controller (37).

3. The high-precision, rapid positioning fixture for crankshaft gear hobbing according to claim 1, characterized in that: A second rotary motor (30) is fixedly installed on the top of the frame (1), and the output end of the second rotary motor (30) drives the hob (31) to rotate through the drive rod (32). An angle sensor (38) for detecting the rotation angle of the drive rod (32) is fixedly installed on the top of the frame (1), and both the second rotary motor (30) and the angle sensor (38) are electrically connected to the controller (37).

4. A high-precision, rapid positioning fixture for crankshaft gear hobbing according to claim 3, characterized in that: The bottom edge of the drive rod (32) is provided with a mating notch (35), and the end of the lifting push rod (10) is fixed with a connecting rod (11). The end of the connecting rod (11) is fixed with a slider (13) that slides in cooperation with the mating notch (35). A first contact switch (12) for detecting whether the slider (13) collides with the bottom of the drive rod (32) is fixedly installed on the slider (13). The first contact switch (12) is electrically connected to the controller (37).

5. A high-precision, rapid positioning fixture for crankshaft gear hobbing according to claim 4, characterized in that: The bottom of the frame (1) is provided with a discharge hole (34) for discharging cutting waste, and the frame (1) is provided with an inclined guide plate (33) for guiding the cutting waste into the discharge hole (34). The inclined guide plate (33) is located above the slider (13) and is used to prevent the cutting waste from interfering with the normal cooperation between the slider (13) and the discharge hole (34).

6. A high-precision, rapid positioning fixture for crankshaft gear hobbing according to claim 1, characterized in that: The end of the insertion rod (3) is provided with a plug-in mating slope (5), and the top block (17) is provided with a top mating slope (29) that mates with the plug-in mating slope (5).

7. A high-precision, rapid positioning fixture for crankshaft gear hobbing according to claim 1, characterized in that: The bottom of the bottom mating groove (14) is fitted with a lifting rod (25) for lifting the crankshaft (2) in the area corresponding to the circular wheel (204), and the lifting rod (25) is connected to the positioning seat (16) through the first return spring (15).

8. A high-precision, rapid positioning fixture for crankshaft gear hobbing according to claim 1, characterized in that: The bottom of the bottom mating groove (14) is fitted with a pressing rod (23) for pressing the eccentric wheel (203) at the bottom of the corresponding eccentric wheel (203), and a push frame (27) is fixedly installed at the bottom of the pressing rod (23). The push frame (27) is connected to the positioning seat (16) by a third return spring (26), and a limiting block (28) is fixed at the top of the push frame (27) for inserting between the push plate (24) and the positioning seat (16) to prevent the insertion limiting rod (20) from jamming the central shaft (201).

9. A high-precision, rapid positioning fixture for crankshaft gear hobbing according to claim 1, characterized in that: The push plate (24) is fixedly installed to contact the positioning seat (16) to detect whether the plug-in limit rod (20) is correctly engaged in the second contact switch (18) above the central shaft (201), and the second contact switch (18) is electrically connected to the controller (37).

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