An automatic centering device for piston pin chamfering

Abstract

This invention provides an automatic centering device for piston pin chamfering, relating to the field of piston pin machining technology. It includes a lateral adjustment bracket with a lifting support at its top, and a centering component fixedly connected to the top of the lifting support. This invention uses a drive motor to rotate a worm gear, which meshes with a transmission ring worm wheel. The inner meshing gear ring on the inner side of the ring worm wheel rotates synchronously, which in turn drives four sets of annular array rotating brackets to swing synchronously through meshing transmission wheels. This causes the four sets of clamping wheels to move from the periphery towards the center, evenly clamping the piston pin. This principle avoids the drawback of manually adjusting the clamping wheels one by one in existing devices. The synchronous movement of the four sets of clamping wheels ensures a uniform distribution of clamping force, preventing piston pin misalignment due to excessive adjustment on one side. After clamping, the piston pin axis coincides with the central axis of the annular sleeve, allowing for precise matching of the cutting tool axis and solving the problem of easy misalignment in existing devices.

Description

Technical Field

[0001] This utility model relates to the field of piston pin processing technology, and in particular to an automatic centering device for piston pin chamfering. Background Technology

[0002] Piston pins are key components connecting pistons and connecting rods. The junctions of their end faces with the inner and outer diameters usually require chamfering. This process involves using a cutting tool to remove burrs and sharp corners from the piston pin ends, creating smooth bevels or arc surfaces. The purpose is to reduce wear on related components during assembly and use, prevent stress concentration that could lead to component cracking, and improve the ease of assembly and overall structural stability of the piston pin.

[0003] In the chamfering process of piston pins, the centering device is a core auxiliary component for achieving precise machining. Since piston pins are slender cylindrical parts, their axis must be kept coaxial with the axis of the cutting tool during machining. If the piston pin is misaligned, it will lead to inconsistent chamfering dimensions and end face tilting, affecting the assembly accuracy and service life of the piston pin. Therefore, the main function of the centering device is to automatically adjust the position of the piston pin before or during machining, ensuring that its axis coincides with the reference axis of the machining equipment, thus guaranteeing the accuracy and consistency of the chamfering process.

[0004] The existing automatic centering device for piston pin chamfering has the following shortcomings:

[0005] Existing devices mostly employ a structure of unidirectional adjustment or manual adjustment of clamping components one by one, lacking a synchronous transmission clamping mechanism. This results in the need for repeated manual calibration of the clamping wheel position during centering, which is not only cumbersome and time-consuming, but also prone to piston pin misalignment due to uneven manual adjustment force, leading to misalignment between the axis and the cutting tool axis after centering. Existing devices cannot adapt to piston pins of different shapes and lack an integrated adjustment structure for height and lateral position. For conical piston pins, the fixed-angle clamping wheel cannot fit the conical surface, easily causing clamping slippage. For piston pins of different lengths and diameters, or machine tool worktables of different heights, the fixed-position centering component cannot quickly match the machining reference, requiring disassembly and replacement of adaptable components, resulting in poor versatility and affecting machining efficiency. Utility Model Content

[0006] This invention proposes an automatic centering device for piston pin chamfering, to solve the problems mentioned in the background art, such as cumbersome centering adjustment, easy deviation, and inability to adapt to various piston pin shapes and machine tools under various working conditions.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an automatic centering device for piston pin chamfering, comprising a transverse adjustment bracket, wherein a lifting support is provided on the top of the transverse adjustment bracket, and a centering component is fixedly connected to the top of the lifting support.

[0008] The centering assembly includes an annular sleeve fixedly connected to the top of the lifting support. A worm gear is rotatably connected to the inner bottom end of the annular sleeve, and an annular worm wheel is meshed with the outer surface of the worm gear. The annular worm wheel is rotatably connected to the inner side of the annular sleeve, and an internal meshing toothed ring is fixedly connected to the inner surface of the annular worm wheel. Four rotating supports are movably connected in an annular array on the inner side of the annular sleeve. A transmission wheel is fixedly connected to the end of each rotating support near the annular sleeve, and the outer surface of the transmission wheel meshes with the inner surface of the internal meshing toothed ring. A pressure wheel is rotatably connected to the end of each rotating support away from the annular sleeve.

[0009] Preferably, a drive motor is fixedly connected to the bottom front side of the outer surface of the annular sleeve, and the output shaft of the drive motor passes through the inner side of the annular sleeve and is fixedly connected to the front end of the worm gear.

[0010] Preferably, the rotating bracket includes a first connecting plate, which is fixedly connected to the side of the transmission wheel. A second connecting plate is movably connected to the right side of the first connecting plate away from the transmission wheel. The clamping wheel is rotatably connected to the second connecting plate away from the first connecting plate. An arc-shaped groove is provided on the outer side of the second connecting plate.

[0011] Preferably, an arc-shaped plate is fixedly connected to one side of the connecting plate one near the connecting plate two, the arc-shaped plate is slidably connected to the inner surface of the arc-shaped groove, and a fastening bolt is threadedly connected to the middle of the arc-shaped plate, the fastening bolt penetrating to the inner surface of the arc-shaped groove.

[0012] Preferably, the lateral adjustment bracket includes a U-shaped connecting frame, with a transmission screw rotatably connected to the inner center of the U-shaped connecting frame, and the right end of the transmission screw extending through to the right center of the U-shaped connecting frame and fixedly connected to a knob.

[0013] Preferably, the outer surface of the transmission screw is threadedly connected to a support plate, and the bottom front and rear sides of the support plate are slidably connected to guide rods that pass through from left to right. The two guide rods are respectively fixedly connected to the inner front and rear sides of the U-shaped connecting frame.

[0014] Preferably, the top center of the support slide plate is provided with a connecting groove, and threaded holes are provided on both the front and rear sides of the top of the support slide plate.

[0015] Preferably, the lifting support includes a connecting seat, which is disposed on the top of the supporting slide plate and fixedly connected to the bottom end of the annular sleeve.

[0016] Preferably, a sliding groove plate is fixedly connected to the bottom center of the connecting seat, and the outer surface of the sliding groove plate is slidably connected to the inner surface of the connecting groove.

[0017] Preferably, the bottom front and rear sides of the connecting seat are rotatably connected with threaded posts, the outer surface of the threaded posts is threadedly connected to the inner surface of the threaded holes, and the top of the threaded posts extends through to the top of the connecting seat and is fixedly connected with a knob.

[0018] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0019] 1. In this utility model, the synchronous clamping and centering of the clamping wheels is achieved through the mutual cooperation between the worm, annular worm wheel, internal meshing toothed ring, and four sets of rotating supports in the centering component. This reduces manual adjustment steps and improves centering accuracy. The drive motor drives the worm to rotate, and the worm meshes with the annular worm wheel. The internal meshing toothed ring on the inner side of the annular worm wheel rotates synchronously, which in turn drives the four sets of rotating supports in the annular array to swing synchronously through the meshing transmission wheel. This causes the four sets of clamping wheels to move closer to the center from all sides, evenly clamping the piston pin. This principle avoids the drawback of manually adjusting the clamping wheels one by one in existing devices. The synchronous action of the four sets of clamping wheels ensures that the clamping force is evenly distributed, and the piston pin will not be offset due to excessive adjustment on one side. After clamping, the piston pin axis coincides with the central axis of the annular sleeve, which can accurately match the axis of the cutting tool and solve the problem of easy centering offset in existing devices.

[0020] 2. In this utility model, through the mutual cooperation between the arc-shaped plate, arc-shaped groove, and fastening bolt of the rotating bracket and the transmission screw, support slide plate, threaded column, and threaded hole of the lifting support of the transverse adjustment bracket, multi-form piston pin adaptation and multi-condition machine tool matching are achieved. This achieves the beneficial effects of improving the versatility of the device and reducing processing and adaptation costs. For conical piston pins, loosening the fastening bolt of the rotating bracket allows the arc-shaped plate to slide along the arc-shaped groove of the connecting plate two, driving the clamping wheel to adjust the angle so that the outer surface of the clamping wheel fits against the conical surface of the conical piston pin. Tightening the bolt fixes the angle, solving the problem that the clamping wheel of the existing device cannot adapt to the conical surface when fixing the angle. For piston pins of different lengths... The piston pin is adjusted by rotating knob one on the lateral adjustment bracket. The transmission screw drives the support slide plate to slide left and right along the guide rod, adjusting the lateral position of the centering component to fit the length of the unclamped end of the piston pin. For machine tool worktables of different heights or piston pins of different diameters, rotating knob two on the lifting support rotates the threaded column along the threaded hole of the support slide plate, driving the connecting seat to move up and down, adjusting the overall height of the centering component to ensure that the piston pin clamping center is aligned with the axis of the cutting tool. This principle allows the device to adapt to straight and conical piston pins, piston pins of different lengths and diameters, and machine tools of different heights without disassembling or replacing parts, solving the problems of poor versatility and high adaptation costs of existing devices. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the automatic centering device for piston pin chamfering of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the horizontal adjustment bracket of this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the lifting support of this utility model;

[0024] Figure 4 This is a cross-sectional structural diagram of the centering component of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the rotating bracket of this utility model.

[0026] Legend: 1. Lateral adjustment bracket; 11. U-shaped connecting frame; 12. Transmission screw; 13. Knob 1; 14. Support slide plate; 15. Guide rod; 16. Connecting slide groove; 17. Threaded hole; 2. Lifting support; 21. Connecting seat; 22. Slide groove insert plate; 23. Threaded column; 24. Knob 2; 3. Centering assembly; 31. Annular sleeve; 32. Worm gear; 33. Drive motor; 34. Annular worm gear; 35. Internal meshing gear ring; 36. Transmission wheel; 37. Rotating bracket; 371. Connecting plate 1; 372. Connecting plate 2; 373. Arc groove; 374. Arc plate; 375. Fastening bolt; 38. Pressure wheel. Detailed Implementation

[0027] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0029] Example 1: As Figure 1 , Figure 2 and Figure 3As shown, this utility model provides a technical solution: it includes a horizontal adjustment bracket 1, a lifting support 2 is provided on the top of the horizontal adjustment bracket 1, and a centering component 3 is fixedly connected to the top of the lifting support 2. The horizontal adjustment bracket 1 includes a U-shaped connecting frame 11, a transmission screw 12 is rotatably connected to the inner center of the U-shaped connecting frame 11, the right end of the transmission screw 12 passes through to the right center of the U-shaped connecting frame 11 and is fixedly connected to a knob 13, a support slide plate 14 is threadedly connected to the outer surface of the transmission screw 12, and guide rods 15 that pass through the bottom front and rear sides of the support slide plate 14 are slidably connected to the bottom front and rear sides, and the two guide rods 15 are respectively fixedly connected to the inner front and rear sides of the U-shaped connecting frame 11. On both sides, a connecting groove 16 is provided at the top center of the supporting slide plate 14, and threaded holes 17 are provided on both the front and rear sides of the top of the supporting slide plate 14. The lifting support 2 includes a connecting seat 21, which is set on the top of the supporting slide plate 14 and fixedly connected to the bottom end of the annular sleeve 31. A groove insert plate 22 is fixedly connected to the bottom center of the connecting seat 21. The outer surface of the groove insert plate 22 is slidably connected to the inner surface of the connecting groove 16. Threaded columns 23 are rotatably connected to both the front and rear sides of the bottom of the connecting seat 21. The outer surface of the threaded column 23 is threadedly connected to the inner surface of the threaded hole 17. The top end of the threaded column 23 extends through to the top of the connecting seat 21 and is fixedly connected to a knob 24.

[0030] The overall effect of embodiment 1 is as follows: rotating knob 13 can drive the transmission screw 12 to rotate. Under the limiting and guiding action of guide rod 15, the support slide plate 14 slides left and right along the transmission screw 12, thereby driving the lifting support 2 and the centering component 3 to move laterally synchronously, realizing the adaptation to the unclamped end of piston pins of different lengths; rotating knob 24, the threaded column 23 rotates along the threaded hole 17. Combined with the sliding limit of the slide plate 22 in the connecting slide 16, the connecting seat 21 drives the centering component 3 to move up and down, completing the height adaptation to machine tool worktables of different heights or piston pins of different diameters, ensuring that the clamping center of the centering component 3 can be initially aligned with the axis of the cutting tool, laying the foundation for subsequent precise centering.

[0031] Example 2: As Figure 4 and Figure 5As shown, this utility model provides a technical solution: the centering component 3 includes an annular sleeve 31, which is fixedly connected to the top of the lifting support 2. A worm gear 32 is rotatably connected to the bottom inner side of the annular sleeve 31. An annular worm wheel 34 is meshed with the outer surface of the worm gear 32. The annular worm wheel 34 is rotatably connected to the inner side of the annular sleeve 31. An internal meshing toothed ring 35 is fixedly connected to the inner surface of the annular worm wheel 34. Four rotating supports 37 are movably connected in an annular array on the inner side of the annular sleeve 31. A transmission wheel 36 is fixedly connected to one end of the rotating support 37 near the annular sleeve 31. The outer surface of the transmission wheel 36 meshes with the inner surface of the internal meshing toothed ring 35. A pressure wheel 38 is rotatably connected to the other end of the rotating support 37 away from the annular sleeve 31. The bottom front side of the annular sleeve 31 is fixed. A drive motor 33 is connected, and the output shaft of the drive motor 33 passes through the inner side of the annular sleeve 31 and is fixedly connected to the front end of the worm gear 32. The rotating bracket 37 includes a first connecting plate 371, which is fixedly connected to the side of the transmission wheel 36. A second connecting plate 372 is movably connected to the right side of the first connecting plate 371 away from the transmission wheel 36. A pressure wheel 38 is rotatably connected to the second connecting plate 372 on the side away from the first connecting plate 371. An arc groove 373 is provided on the outer side of the second connecting plate 372. An arc plate 374 is fixedly connected to the side of the first connecting plate 371 close to the second connecting plate 372. The arc plate 374 is slidably connected to the inner surface of the arc groove 373. A fastening bolt 375 is threadedly connected to the middle of the arc plate 374, and the fastening bolt 375 passes through the inner surface of the arc groove 373.

[0032] The overall effect achieved by Embodiment 2 is as follows: For the conical piston pin, loosening the fastening bolt 375 allows the arc plate 374 to slide along the arc groove 373, driving the connecting plate 372 and the clamping wheel 38 to adjust their angles, so that the outer surface of the clamping wheel 38 is in close contact with the conical surface of the conical piston pin. Tightening the fastening bolt 375 fixes the angle and prevents slippage during clamping. The drive motor 33 is started, and its output shaft drives the worm 32 to rotate. The worm 32 meshes with the transmission annular worm wheel 34, which drives the inner meshing toothed ring 35 to rotate synchronously. The inner meshing toothed ring 35 drives the four sets of rotating brackets 37 to swing synchronously through the transmission wheel 36, so that the four sets of clamping wheels 38 move closer to the center from all sides, evenly clamping the piston pin and achieving precise centering.

[0033] The working principle of the entire equipment is as follows: First, according to the length of the piston pin to be processed, rotate knob 13 of the transverse adjustment bracket 1. The transmission screw 12 drives the support slide plate 14 to slide left and right along the guide rod 15, adjusting the centering component 3 to a transverse position that matches the length of the unclamped end of the piston pin. Next, according to the height of the machine tool worktable and the diameter of the piston pin, rotate knob 24 of the lifting support 2. The threaded column 23 rotates along the threaded hole 17, and the connecting seat 21 drives the centering component 3 to move up and down, so that the clamping center of the centering component 3 is initially aligned with the axis of the cutting tool. If the piston pin is conical, loosen the fastening bolt 375 of the rotating bracket 37 and slide the arc plate. 374. Adjust the angle of the clamping wheel 38 to make it fit against the conical surface, then tighten the bolts to fix it. Finally, clamp one end of the piston pin on the machine tool chuck, and extend the other end into the annular sleeve 31 of the centering assembly 3. Start the drive motor 33. The drive motor 33 drives the worm 32 to rotate. The worm 32 meshes with the annular worm wheel 34. The annular worm wheel 34 drives the internal meshing gear ring 35 to rotate. The internal meshing gear ring 35 drives the four sets of rotating brackets 37 to swing synchronously through the transmission wheel 36. The four sets of clamping wheels 38 clamp the piston pin evenly from all sides to the center, completing the automatic centering. At this time, the piston pin axis is precisely aligned with the cutting tool axis, and the machine tool can be started for chamfering.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A piston pin chamfering automatic centering device, characterized by: It includes a lateral adjustment bracket (1), and a lifting support (2) is provided on the top of the lateral adjustment bracket (1), and a centering component (3) is fixedly connected to the top of the lifting support (2). The centering assembly (3) includes an annular sleeve (31), which is fixedly connected to the top of the lifting support (2). A worm (32) is rotatably connected to the bottom inner side of the annular sleeve (31). An annular worm wheel (34) is meshed with the outer surface of the worm (32). The annular worm wheel (34) is rotatably connected to the inner side of the annular sleeve (31). An internal meshing toothed ring (35) is fixedly connected to the inner surface of the annular worm wheel (34). Four rotating brackets (37) are movably connected to the inner annular array of the annular sleeve (31). A transmission wheel (36) is fixedly connected to one end of the rotating bracket (37) near the annular sleeve (31). The outer surface of the transmission wheel (36) meshes with the inner surface of the internal meshing toothed ring (35). A pressure wheel (38) is rotatably connected to one end of the rotating bracket (37) away from the annular sleeve (31).

2. The automatic centering device for machining the chamfer of a piston pin according to claim 1, characterized in that: A drive motor (33) is fixedly connected to the bottom front side of the outer surface of the annular sleeve (31). The output shaft of the drive motor (33) passes through the inner side of the annular sleeve (31) and is fixedly connected to the front end of the worm (32).

3. The automatic centering device for piston pin chamfering according to claim 1, characterized in that: The rotating bracket (37) includes a first connecting plate (371), which is fixedly connected to the side of the transmission wheel (36). A second connecting plate (372) is movably connected to the right side of the first connecting plate (371) away from the transmission wheel (36). The pressing wheel (38) is rotatably connected to the second connecting plate (372) away from the first connecting plate (371). An arc-shaped groove (373) is provided on the outer side of the second connecting plate (372).

4. The automatic centering device for machining the chamfer of a piston pin according to claim 3, characterized in that: An arc-shaped plate (374) is fixedly connected to the side of the connecting plate one (371) near the connecting plate two (372). The arc-shaped plate (374) is slidably connected to the inner surface of the arc-shaped groove (373). A fastening bolt (375) is threadedly connected to the middle of the arc-shaped plate (374), and the fastening bolt (375) penetrates to the inner surface of the arc-shaped groove (373).

5. The automatic centering device for piston pin chamfering according to claim 1, characterized in that: The horizontal adjustment bracket (1) includes a loop-shaped connecting frame (11), and a transmission screw (12) is rotatably connected to the inner middle of the loop-shaped connecting frame (11). The right end of the transmission screw (12) passes through to the right middle of the loop-shaped connecting frame (11) and is fixedly connected to a knob (13).

6. The automatic centering device for machining the chamfer of a piston pin according to claim 5, characterized in that: The outer surface of the transmission screw (12) is threaded with a support plate (14). The bottom front and rear sides of the support plate (14) are slidably connected with guide rods (15) that pass through from left to right. The two guide rods (15) are respectively fixedly connected to the inner front and rear sides of the U-shaped connecting frame (11).

7. The automatic centering device for machining the chamfer of a piston pin according to claim 6, characterized in that: The top center of the support slide plate (14) is provided with a connecting groove (16), and threaded holes (17) are provided on both the front and rear sides of the top of the support slide plate (14).

8. The automatic centering device for piston pin chamfering according to claim 7, characterized in that: The lifting support (2) includes a connecting seat (21), which is located on the top of the supporting slide plate (14) and is fixedly connected to the bottom end of the annular sleeve (31).

9. The automatic centering device for machining the chamfer of a piston pin according to claim 8, characterized in that: The bottom center of the connecting seat (21) is fixedly connected to a sliding groove plate (22), and the outer surface of the sliding groove plate (22) is slidably connected to the inner surface of the connecting groove (16).

10. The automatic centering device for machining the chamfer of a piston pin according to claim 8, characterized in that: The bottom front and rear sides of the connecting seat (21) are rotatably connected with threaded columns (23). The outer surface of the threaded column (23) is threadedly connected to the inner surface of the threaded hole (17). The top of the threaded column (23) extends through to the top of the connecting seat (21) and is fixedly connected with a knob (24).

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