A high-precision drilling device for a motorcycle crank

Abstract

The present invention relates to the technical field of drilling devices, and discloses a high-precision drilling device for motorcycle cranks, comprising a lathe body, a spindle box is arranged at one end of the lathe body, a spindle is arranged inside the spindle box, a three-jaw chuck is arranged at one end of the spindle, and a motorcycle crank is arranged inside the three-jaw chuck. The present invention allows the limit column to drive the T-shaped arc slider to slide along the T-shaped arc slot through the continuous rotation of the motorcycle crank, and the T-shaped arc slider stops sliding when it slides to the other end of the T-shaped arc slot. At this time, the limit column limits the continued rotation of the motorcycle crank, and the operator turns the spindle locking wrench to lock the rotation of the motorcycle crank. At this time, the position of the motorcycle crank neck is fixed. The present device does not need to manually use a dial indicator to align the position of the motorcycle crank neck, and greatly improves the production efficiency when drilling motorcycle cranks in batches.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling devices, and particularly to a high-precision drilling device for motorcycle cranks. Background Art

[0002] A crank is a common mechanical device, usually consisting of a lever connecting two rotating components. It consists of a fixed crank arm and a rotating arm connected to the other end of the crank arm. The crank is used to convert rotational motion into linear motion or vice versa. A high-precision drilling device for a crank is a device for performing high-precision drilling operations on components such as cranks.

[0003] When the existing crank drilling device drills a hole, the operator manually clamps the crank on the three-jaw chuck, then aligns the position of the crank neck through a dial indicator, and finally locks the spindle of the three-jaw chuck to drill at its crank neck position. The method of manually aligning the crank neck position is too slow, and when drilling a large number of cranks in batches, the production efficiency is greatly reduced. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies existing in the prior art, and to propose a high-precision drilling device for motorcycle cranks.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A high-precision drilling device for motorcycle cranks, including a lathe body. One end of the lathe body is provided with a headstock. The inside of the headstock is provided with a main shaft. One end of the main shaft is provided with a three-jaw chuck. The inside of the three-jaw chuck is provided with a motorcycle crank. The outer surface of the motorcycle crank is provided with a crank neck, and the crank neck is arranged at an eccentric position of the motorcycle crank. The upper surface of the lathe body is fixedly installed with a column. The bottom end of the column is fixedly installed with a semi-circular ring. The upper surface of the semi-circular ring is provided with a T-shaped arc chute. A T-shaped arc slider is slidably installed on the inner wall of the T-shaped arc chute. The upper surface of the T-shaped arc slider is fixedly installed with a limiting column, and the limiting column abuts against the outer surface of the crank neck of the motorcycle crank. The semi-circular ring, the three-jaw chuck and the motorcycle crank are arranged at the same center, and the axis of the limiting column passes through the center of the semi-circular ring.

[0007] As a further solution of the present invention, the top end of the column is fixedly installed with a support. A rotating shaft is rotatably installed between the inner walls of the support. An L-shaped rotating plate is fixedly installed on the outer surface of the rotating shaft. A drill sleeve is slidably inserted at the top end of the L-shaped rotating plate. The cross-section of the drill sleeve is I-shaped. A second tension spring is sleeved on the outer surface of the drill sleeve near one end of the semi-circular ring. One end of the second tension spring is fixedly connected to one end of the drill sleeve, and the other end of the second tension spring is fixedly connected to the lower surface of the L-shaped rotating plate.

[0008] As a further solution of the present invention, two support plates are symmetrically fixedly installed on the lower surface of the semicircular ring, and a driving gear is rotatably installed between the two support plates. The bottom of the T-shaped arc slider passes through the lower surface of the semicircular ring and is fixedly installed with an arc rack, which is meshed with the driving gear, and the arc rack and the semicircular ring are arranged at the same center of a circle.

[0009] As a further solution of the present invention, one end of the driving gear passes through the outer surface of the support plate and is fixedly installed with a first pulley, the lower surface of the column near the top is rotatably installed with a second pulley, the outer surfaces of the first pulley and the second pulley are sleeved with belts, one end of the second pulley is fixedly installed with a driven gear, one end of the rotating shaft passes through the outer surface of the support and is fixedly installed with a fan-shaped gear, the fan-shaped gear is meshed with the driven gear, and a first tension spring is fixedly installed on the upper surface of the L-shaped rotating plate, and the bottom end of the first tension spring is fixedly connected to the end face of the top end of the column.

[0010] As a further solution of the present invention, a liquid storage box is fixedly installed on the upper surface of the L-shaped rotating plate, a one-way oil inlet nozzle is provided on the upper surface of the liquid storage box, a conduit is fixedly installed on the outer surface of the liquid storage box, a flow channel is opened on the top of the L-shaped rotating plate, the liquid outlet end of the conduit is fixedly connected to the inner wall of the flow channel, a through hole is opened through the circumferential outer surface of the drill sleeve, the liquid storage box is connected with the through hole through the flow channel and the conduit, and the through hole is connected with the interior of the drill sleeve.

[0011] As a further solution of the present invention, a limiting protrusion is provided on the circumferential outer surface of the drill sleeve, and a limiting groove matching the limiting protrusion is opened on the inner wall of the L-shaped rotating plate near the top, and the limiting protrusion is slidably installed on the inner wall of the limiting groove.

[0012] As a further solution of the present invention, a tailstock is arranged on the upper surface of the other end of the lathe body, a drilling machine is arranged on the upper surface of the lathe body, and a spindle locking wrench is arranged on the outer surface of the spindle box.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The motorcycle crank continues to rotate, so that the limit column drives the T-shaped arc slider to slide along the T-shaped arc slot. When the T-shaped arc slider slides to the other end of the T-shaped arc slot, it stops sliding. At this time, the limit column limits the continued rotation of the motorcycle crank. The operator turns the spindle locking wrench to lock the rotation of the motorcycle crank. At this time, the position of the motorcycle crank neck is fixed. The device does not need to manually use a dial indicator to align the position of the motorcycle crank neck. When drilling holes in batches of motorcycle cranks, the production efficiency is greatly improved.

[0015] 2. The rotating shaft drives the L-shaped rotating plate to move closer to the motorcycle crank. The L-shaped rotating plate drives the drill sleeve to move closer to the motorcycle crank. Through this device, the drill sleeve is moved to the position where the neck of the motorcycle crank needs to be drilled, guiding the drill bit on the drilling machine, enabling precise drilling of the neck of the motorcycle crank and avoiding scrapping of the motorcycle crank due to drilling deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. 1 is a schematic diagram of the overall structure of a high-precision drilling device for a motorcycle crank proposed by the present invention;

[0017] Figure 2 FIG. 2 is a schematic top view structure diagram of a high-precision drilling device for a motorcycle crank proposed by the present invention;

[0018] Figure 3 FIG. 3 is a schematic diagram of a semi-circular ring of a high-precision drilling device for a motorcycle crank proposed by the present invention;

[0019] Figure 4 FIG. 4 is a schematic rear view of a semi-circular ring of a high-precision drilling device for a motorcycle crank proposed by the present invention;

[0020] Figure 5 FIG. 5 is a schematic top view of a semi-circular ring of a high-precision drilling device for a motorcycle crank proposed by the present invention;

[0021] Figure 6 FIG. 6 is a schematic diagram of an L-shaped rotating plate of a high-precision drilling device for a motorcycle crank proposed by the present invention;

[0022] Figure 7 FIG. 7 is a schematic diagram of a drill sleeve of a high-precision drilling device for a motorcycle crank proposed by the present invention.

[0023] In the figures: 1, lathe body; 2, headstock; 3, three-jaw chuck; 4, tailstock; 5, spindle locking wrench; 6, drilling machine; 7, motorcycle crank; 8, column; 801, support; 9, semi-circular ring; 901, support plate; 10, T-shaped arc chute; 11, T-shaped arc slider; 12, limit post; 13, arc rack; 14, drive gear; 15, first pulley; 16, belt; 17, second pulley; 18, driven gear; 19, sector gear; 20, L-shaped rotating plate; 21, first tension spring; 22, liquid storage tank; 23, one-way oil inlet nozzle; 24, conduit; 25, drill sleeve; 2501, through hole; 2502, limit projection; 26, flow channel; 27, second tension spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] Referring to Figures 1-7 , a high-precision drilling device for a motorcycle crank, includes a lathe body 1. One end of the lathe body 1 is provided with a headstock 2. A main shaft is arranged inside the headstock 2. One end of the main shaft is provided with a three-jaw chuck 3. A motorcycle crank 7 is arranged inside the three-jaw chuck 3. A crank neck is arranged on the outer surface of the motorcycle crank 7. The crank neck is arranged at an eccentric position of the motorcycle crank 7. A column 8 is fixedly installed on the upper surface of the lathe body 1. A semi-circular ring 9 is fixedly installed at the bottom end of the column 8. A T-shaped arc chute 10 is formed through the upper surface of the semi-circular ring 9. A T-shaped arc slider 11 is slidably installed on the inner wall of the T-shaped arc chute 10. A limiting column 12 is fixedly installed on the upper surface of the T-shaped arc slider 11. The limiting column 12 abuts against the outer surface of the crank neck of the motorcycle crank 7. The semi-circular ring 9, the three-jaw chuck 3 and the motorcycle crank 7 are arranged at the same center. The axis of the limiting column 12 passes through the center of the semi-circular ring 9.

[0028] By manually turning the three-jaw chuck 3 to rotate, the three-jaw chuck 3 drives the motorcycle crank 7 to rotate. The motorcycle crank 7 rotates so that the neck on its outer surface abuts against the limit post 12. By continuing to rotate the motorcycle crank 7, the limit post 12 drives the T-shaped arc slider 11 to slide along the T-shaped arc chute 10. When the T-shaped arc slider 11 slides to the other end of the T-shaped arc chute 10, it stops sliding. At this time, the limit post 12 restricts the continuous rotation of the motorcycle crank 7. The operator pulls the spindle locking wrench 5 to lock the rotation of the motorcycle crank 7. At this time, the position of the neck of the motorcycle crank 7 is fixed. With this device, there is no need to manually align the position of the neck of the motorcycle crank 7 with a dial indicator. When drilling the motorcycle crank 7 in batches, the production efficiency is greatly improved.

[0029] In this embodiment, a support 801 is fixedly installed at the top of the column 8. A rotating shaft is rotatably installed between the inner walls of the support 801. A fixing plate on the outer surface of the rotating shaft is provided with an L-shaped rotating plate 20. A drill sleeve 25 is slidably inserted at the top of the L-shaped rotating plate 20. The cross-section of the drill sleeve 25 is I-shaped. A second tension spring 27 is sleeved on the outer surface of the drill sleeve 25 near one end of the semi-circular ring 9. One end of the second tension spring 27 is fixedly connected to one end of the drill sleeve 25, and the other end of the second tension spring 27 is fixedly connected to the lower surface of the L-shaped rotating plate 20. Two support plates 901 are symmetrically and fixedly installed on the lower surface of the semi-circular ring 9. A driving gear 14 is rotatably installed between the two support plates 901. The bottom of the T-shaped arc slider 11 penetrates through the lower surface of the semi-circular ring 9 and is fixedly installed with an arc rack 13. The arc rack 13 meshes with the driving gear 14. The arc rack 13 and the semi-circular ring 9 are arranged at the same center of the circle. One end of the driving gear 14 penetrates through the outer surface of the support plate 901 and is fixedly installed with a first belt pulley 15. A second belt pulley 17 is rotatably installed on the lower surface of the column 8 near the top. A belt 16 is sleeved on the outer surfaces of the first belt pulley 15 and the second belt pulley 17. One end of the second belt pulley 17 is fixedly installed with a driven gear 18. One end of the rotating shaft penetrates through the outer surface of the support 801 and is fixedly installed with a sector gear 19. The sector gear 19 meshes with the driven gear 18. A first tension spring 21 is fixedly installed on the upper surface of the L-shaped rotating plate 20. The bottom end of the first tension spring 21 is fixedly connected to the end face of the top of the column 8.

[0030] The movement of the T-shaped arc slider 11 drives the movement of the arc rack 13. The arc rack 13 drives the first pulley 15 to rotate through the drive gear 14. The first pulley 15 drives the second pulley 17 to rotate through the belt 16. The second pulley 17 drives the driven gear 18 to rotate. The driven gear 18 drives the rotating shaft to rotate through the sector gear 19. The rotating shaft drives the L-shaped rotating plate 20 to move closer to the motorcycle crank 7. The L-shaped rotating plate 20 drives the drill sleeve 25 to move closer to the motorcycle crank 7. Through this device, the drill sleeve 25 moves to the position where the neck of the motorcycle crank 7 needs to be drilled, playing a guiding role for the drill bit on the drilling machine 6, and can accurately drill the neck of the motorcycle crank 7, avoiding the scrapping of the motorcycle crank 7 caused by drilling deviation.

[0031] In this embodiment, a liquid storage tank 22 is fixedly installed on the upper surface of the L-shaped rotating plate 20. A one-way oil inlet nozzle 23 is arranged on the upper surface of the liquid storage tank 22. A conduit 24 is fixedly installed on the outer surface of the liquid storage tank 22. A flow channel 26 is opened at the top of the L-shaped rotating plate 20. The liquid outlet end of the conduit 24 is fixedly connected to the inner wall of the flow channel 26. A through hole 2501 is penetrated and opened on the circumferential outer surface of the drill sleeve 25. The liquid storage tank 22 is communicated with the through hole 2501 through the flow channel 26 and the conduit 24. The through hole 2501 is communicated with the inside of the drill sleeve 25. A limiting protrusion 2502 is arranged on the circumferential outer surface of the drill sleeve 25. A limiting chute matching the limiting protrusion 2502 is opened on the inner wall of the L-shaped rotating plate 20 near the top end. The limiting protrusion 2502 is slidably installed on the inner wall of the limiting chute.

[0032] When the drill bit on the drilling machine 6 passes through the drill sleeve 25 to drill the neck of the motorcycle crank 7, it will drive the drill sleeve 25 to move closer to the motorcycle crank 7. At this time, the through hole 2501 on the drill sleeve 25 is communicated with the flow channel 26. The lubricating oil for drilling inside the liquid storage tank 22 will enter the inside of the drill sleeve 25 through the conduit 24 and the flow channel 26. The outer surface of the drill bit inside the drill sleeve 25 is wetted by the lubricating oil for drilling. Through this device, the drill bit can be lubricated during drilling, facilitating the drill bit to closely drill the neck of the motorcycle crank 7.

[0033] In this embodiment, a tailstock 4 is arranged on the upper surface at the other end of the lathe body 1. A drilling machine 6 is arranged on the upper surface of the lathe body 1. A spindle locking wrench 5 is arranged on the outer surface of the headstock 2. The operator manually clamps one end of the motorcycle crank 7 on the three-jaw chuck 3, fixes the position of the motorcycle crank 7 through the three-jaw chuck 3, and then tops the Morse taper center on the tailstock 4 against the tail of the motorcycle crank 7. The position of the motorcycle crank 7 is restricted through this device, facilitating subsequent drilling.

[0034] It should be noted that when the present invention is in use, the operator manually clamps one end of the motorcycle crank 7 on the three-jaw chuck 3, fixes the position of the motorcycle crank 7 through the three-jaw chuck 3, and then makes the Morse taper center on the tailstock 4 abut against the tail of the motorcycle crank 7, and restricts the position of the motorcycle crank 7 through this device, facilitating subsequent drilling;

[0035] The operator manually turns the three-jaw chuck 3 to drive the motorcycle crank 7 to rotate. The motorcycle crank 7 rotates to make the crank neck on its outer surface abut against the limit post 12. Through the continuous rotation of the motorcycle crank 7, the limit post 12 drives the T-shaped arc slider 11 to slide along the T-shaped arc chute 10. When the T-shaped arc slider 11 slides to the other end of the T-shaped arc chute 10, it stops sliding. At this time, the limit post 12 restricts the continuous rotation of the motorcycle crank 7. The operator turns the spindle locking wrench 5 to lock the rotation of the motorcycle crank 7. At this time, the position of the crank neck of the motorcycle crank 7 is fixed. Through this device, there is no need to manually align the position of the crank neck of the motorcycle crank 7 with a dial indicator, which greatly improves the production efficiency when drilling the motorcycle crank 7 in batches;

[0036] The movement of the T-shaped arc slider 11 drives the movement of the arc rack 13. The arc rack 13 drives the first pulley 15 to rotate through the driving gear 14. The first pulley 15 drives the second pulley 17 to rotate through the belt 16. The second pulley 17 drives the driven gear 18 to rotate. The driven gear 18 drives the rotating shaft to rotate through the sector gear 19. The rotating shaft drives the L-shaped rotating plate 20 to move closer to the motorcycle crank 7. The L-shaped rotating plate 20 drives the drill sleeve 25 to move closer to the motorcycle crank 7. Through this device, the drill sleeve 25 moves to the position where the crank neck of the motorcycle crank 7 needs to be drilled, guiding the drill bit on the drilling machine 6, and can accurately drill the crank neck of the motorcycle crank 7, avoiding scrapping of the motorcycle crank 7 caused by drilling deviation;

[0037] Before use, the operator manually adds the lubricating oil for drilling into the interior of the liquid storage tank 22 from the one-way oil inlet nozzle 23. When the drill bit on the drilling machine 6 drills through the drill sleeve 25 to drill the crank neck of the motorcycle crank 7, it will drive the drill sleeve 25 to move closer to the motorcycle crank 7. At this time, the through hole 2501 on the drill sleeve 25 is communicated with the flow channel 26, and the lubricating oil for drilling in the liquid storage tank 22 will enter the interior of the drill sleeve 25 through the conduit 24 and the flow channel 26. The outer surface of the drill bit inside the drill sleeve 25 is wetted by the lubricating oil for drilling. Through this device, the drill bit can be lubricated during drilling, facilitating the drill bit to tightly drill the crank neck of the motorcycle crank 7.

[0038] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A high-precision drilling device for a motorcycle crank, comprising a lathe body (1), one end of the lathe body (1) is provided with a headstock (2), the inside of the headstock (2) is provided with a main shaft, and one end of the main shaft is provided with a three-jaw chuck (3), characterized in that, Inside the three-jaw chuck (3) is provided a motorcycle crank (7). The outer surface of the motorcycle crank (7) is provided with a crank neck, and the crank neck is arranged at an eccentric position of the motorcycle crank (7). The upper surface of the lathe body (1) is fixedly installed with a column (8). The bottom end of the column (8) is fixedly installed with a semi-circular ring (9). The upper surface of the semi-circular ring (9) is penetrated and provided with a T-shaped arc chute (10). A T-shaped arc slider (11) is slidably installed on the inner wall of the T-shaped arc chute (10). The upper surface of the T-shaped arc slider (11) is fixedly installed with a limit post (12), and the limit post (12) abuts against the outer surface of the crank neck of the motorcycle crank (7). The semi-circular ring (9), the three-jaw chuck (3) and the motorcycle crank (7) are arranged at the same center. The axis of the limit post (12) passes through the center of the semi-circular ring (9). The top end of the column (8) is fixedly installed with a support (801). A rotating shaft is rotatably installed between the inner walls of the support (801). An L-shaped rotating plate (20) is fixedly installed on the outer surface of the rotating shaft. A drill sleeve (25) is slidably inserted at the top end of the L-shaped rotating plate (20). The cross-section of the drill sleeve (25) is in an I-shape. A second tension spring (27) is sleeved on the outer surface of the end of the drill sleeve (25) close to the semi-circular ring (9). One end of the second tension spring (27) is fixedly connected to one end of the drill sleeve (25), and the other end of the second tension spring (27) is fixedly connected to the lower surface of the L-shaped rotating plate (20). Two support plates (901) are symmetrically and fixedly installed on the lower surface of the semi-circular ring (9). A driving gear (14) is rotatably installed between the two support plates (901). The bottom of the T-shaped arc slider (11) penetrates the lower surface of the semi-circular ring (9) and is fixedly installed with an arc rack (13). The arc rack (13) meshes with the driving gear (14). The arc rack (13) and the semi-circular ring (9) are arranged at the same center. One end of the driving gear (14) penetrates the outer surface of the support plate (901) and is fixedly installed with a first belt pulley (15). A second belt pulley (17) is rotatably installed on the lower surface of the column (8) near the top end. A belt (16) is sleeved on the outer surfaces of the first belt pulley (15) and the second belt pulley (17). One end of the second belt pulley (17) is fixedly installed with a driven gear (18). One end of the rotating shaft penetrates the outer surface of the support (801) and is fixedly installed with a sector gear (19). The sector gear (19) meshes with the driven gear (18). A first tension spring (21) is fixedly installed on the upper surface of the L-shaped rotating plate (20). The bottom end of the first tension spring (21) is fixedly connected to the end face of the top end of the column (8).

2. The high-precision drilling device for a motorcycle crank according to claim 1, characterized in that, A liquid storage tank (22) is fixedly installed on the upper surface of the L-shaped rotating plate (20). A one-way oil inlet nozzle (23) is arranged on the upper surface of the liquid storage tank (22). A conduit (24) is fixedly installed on the outer surface of the liquid storage tank (22). A flow channel (26) is formed at the top of the L-shaped rotating plate (20). The liquid outlet end of the conduit (24) is fixedly connected to the inner wall of the flow channel (26). A through hole (2501) is formed through the outer circumferential surface of the drill sleeve (25). The liquid storage tank (22) is communicated with the through hole (2501) through the flow channel (26) and the conduit (24). The through hole (2501) is communicated with the inside of the drill sleeve (25).

3. The high-precision drilling device for a motorcycle crank according to claim 2, characterized in that, A limiting projection (2502) is arranged on the outer circumferential surface of the drill sleeve (25). A limiting sliding groove matching with the limiting projection (2502) is formed in the inner wall of the L-shaped rotating plate (20) near the top end. The limiting projection (2502) is slidably installed on the inner wall of the limiting sliding groove.

4. The high-precision drilling device for a motorcycle crank according to claim 1, characterized in that, A tailstock (4) is arranged on the upper surface at the other end of the lathe body (1). A drilling machine (6) is arranged on the upper surface of the lathe body (1). A spindle locking wrench (5) is arranged on the outer surface of the headstock (2).

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