Motorcycle crankshaft press-fitting die

Abstract

The utility model relates to the technical field of mechanical tool clamps, and discloses a motorcycle crankshaft press-fitting die which comprises a press-fitting frame, hydraulic machines are fixedly connected to the middles of the left side and the right side of the press-fitting frame, a telescopic rod is slidably connected to the middle of the right side of each hydraulic machine, and a main shaft positioning frame is fixedly connected to the middle of the right side of each telescopic rod. A main shaft groove is formed in the front side of the top of the right side of the main shaft positioning frame, a curved neck positioning frame is slidably connected to the middle of the inner side of the press-fitting frame, crank grooves are formed in the left side and the right side of the curved neck positioning frame, and a curved neck groove is formed in the middle-rear portion of the right side of the curved neck positioning frame. Three parts of a crankshaft are positioned through the positioning frame placed in the press-fitting groove, the parts are clamped through the positioning groove, the positioning reference degree is improved, a main shaft of a finished crankshaft is sleeved with the hoisting ring, the finished crankshaft is conveyed to the next procedure through the movable guide rail, and the working intensity and the labor cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical fixtures, in particular to a motorcycle crankshaft press-fitting die. Background Art

[0002] The crankshaft is the most important component in the engine. It receives the force from the connecting rod and converts it into torque, which is output through the crankshaft and drives other accessories on the engine to work. The crankshaft is subjected to the combined effects of the centrifugal force of the rotating mass, the periodically changing gas inertia, and the reciprocating inertia, which in turn subject the crankshaft to bending and torsional loads. Therefore, the crankshaft must possess sufficient strength and rigidity, and the journal surface must be wear-resistant, operate evenly, and be well balanced. To reduce the crankshaft mass and the centrifugal forces generated during movement, the crankshaft journals are often hollow, with oil holes drilled into and out of each journal surface to lubricate the journal surface. To reduce stress concentration, the main journals, crankpins, and crank arms are connected using transition arcs. The crankshaft counterweight (also called a counterweight) balances the centrifugal force and torque, and sometimes the reciprocating inertia force and torque. When these forces and torques are balanced, the counterweight also reduces the load on the main bearings. The number, size, and placement of the counterweights depend on factors such as the number of cylinders in the engine, the cylinder arrangement, and the crankshaft shape. Counterweights are typically cast or forged integrally with the crankshaft. For high-power diesel engines, counterweights are manufactured separately from the crankshaft and bolted together.

[0003] Motorcycle engines generally use single-cylinder or two-cylinder cylinder blocks. The crankshaft, an important component of the engine, is generally processed in a split manner due to its small shaft body. The crankshaft is split into a main shaft, crank and crank neck, and then the main shaft, crank and crank neck are pressed together through a press-fitting process. When assembling the crankshaft, the crank neck pin needs to be assembled into the two crank pin holes. Since there is an interference fit between the crank neck pin and the crank pin hole, conventional installation cannot meet the crankshaft installation requirements, so a press-fitting process is used for assembly.

[0004] The press-fitting mold used in the existing crankshaft press-fitting process has inaccurate positioning of parts when press-fitting the crank neck, which can easily cause the crank neck to damage the pin hole of the crank, thereby making the quality of the crankshaft after press-fitting impossible to guarantee and the parts qualification rate low. The crankshaft that has been press-fitted needs to be manually transported to the next process, which is labor-intensive and increases labor costs. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a motorcycle crankshaft press-fitting mold, which aims to improve the problems in the existing technology of inaccurate positioning of the crankshaft press-fitting fixture, low part qualification rate, high intensity of finished product handling work, and high labor costs.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a motorcycle crankshaft press-fitting mold comprises a press-fitting frame, wherein the middle parts of the left and right sides of the press-fitting frame are fixedly connected to a hydraulic press, the middle part of the right side of the hydraulic press is slidably connected to a telescopic rod, the middle part of the right side of the telescopic rod is fixedly connected to a spindle positioning frame, a spindle slot is provided on the front side of the top right side of the spindle positioning frame, a crank neck positioning frame is slidably connected to the middle part of the inner side of the press-fitting frame, crank slots are provided on the left and right sides of the crank neck positioning frame, and a crank neck slot is provided in the middle and rear part of the right side of the crank neck positioning frame. The left and right sides of the middle inner side of the pressing frame are slidably connected to the crank positioning frame, and a crank slot is provided on the right side of the crank positioning frame. The four corners of the top of the pressing frame are fixedly connected to the hanging frame, and the top of the hanging frame is fixedly connected to the guide rail, and the top of the outer side of the guide rail is connected to the moving wheel in a rolling manner. The middle part of the moving wheel is rotatably connected to the moving shaft, and the middle part of the outer side of the moving shaft is fixedly connected to the moving platform. The middle parts of the left and right sides of the bottom end of the moving platform are fixedly connected to the cable box, and the cable box is provided with a suspension cable, and the end of the suspension cable is fixedly connected to the lifting ring.

[0007] As a further description of the above technical solution:

[0008] A crankshaft crank is placed inside the crankshaft groove, and a crankshaft crank is fixedly connected to the left and right sides of the crankshaft crank. The front side of the right end of the crankshaft crank is fixedly connected to the crankshaft main shaft, the front side of the right end of the crankshaft crank is provided with an axis hole, and the rear side of the right end of the crankshaft crank is provided with a pin hole.

[0009] As a further description of the above technical solution:

[0010] The four corners of the bottom end of the press-fitting frame are fixedly connected with supporting feet.

[0011] As a further description of the above technical solution:

[0012] Positioning holes are provided on the front and rear sides of the right bottom of the spindle positioning frame, and positioning holes are provided on the front and rear sides of the right end bottom of the crank positioning frame.

[0013] As a further description of the above technical solution:

[0014] The left and right sides of the rear end of the outer side of the hydraulic press are fixedly connected with oil delivery ports.

[0015] As a further description of the above technical solution:

[0016] The front and rear sides of the bottom of the left and right sides of the curved neck positioning frame are fixedly connected with positioning rods, and the outer sides of the positioning rods are sleeved with return springs.

[0017] As a further description of the above technical solution:

[0018] The front and rear sides of the right end bottom of the crank positioning frame are both provided with spring holes.

[0019] As a further description of the above technical solution:

[0020] A hoisting motor is fixedly connected between the middle parts of the cable box, and the hoisting motor transmits power to the cable box through the motor shaft.

[0021] The utility model has the following beneficial effects:

[0022] 1. In the present invention, the three components of the crankshaft are positioned by placing the spindle positioning frame, the crank positioning frame and the crank neck positioning frame in the press-fitting groove, and the parts are clamped by the part positioning grooves on the positioning frame, thereby improving the positioning reference accuracy and the part qualification rate.

[0023] 2. In the present invention, the crankshaft is transported and conveyed by a lifting manipulator, the main shaft of the finished crankshaft is inserted into the lifting ring, and the finished product is transported to the next process by a movable guide rail, thereby reducing work intensity and labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A three-dimensional diagram of the motorcycle crankshaft press-fitting die proposed in the present invention;

[0025] Figure 2 This is a structural schematic diagram of the press-fitting mechanism of the motorcycle crankshaft press-fitting die proposed in the present invention;

[0026] Figure 3 This is a structural diagram of the lifting mechanism of the motorcycle crankshaft press-fitting die proposed in the present invention;

[0027] Figure 4 This is a schematic structural diagram of the crankshaft of the motorcycle crankshaft press-fitting die proposed by the present invention.

[0028] Legend:

[0029] 1. Press-fitting frame; 2. Spindle positioning frame; 3. Crank positioning frame; 4. Crank neck positioning frame; 5. Crankshaft spindle; 6. Crankshaft crank; 7. Crankshaft crank; 8. Shaft hole; 9. Pin hole; 10. Crank slot; 11. Spindle slot; 12. Crank neck slot; 13. Positioning rod; 14. Return spring; 15. Spring hole; 16. Telescopic rod; 17. Hydraulic press; 18. Support leg; 19. Lifting frame; 20. Mobile platform; 21. Lifting ring; 22. Lifting motor; 23. Guide rail; 24. Moving wheel; 25. Cable box; 26. Lifting cable; 27. Mobile shaft. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Reference Figure 1-Figure 2 The utility model provides an embodiment: a motorcycle crankshaft press-fitting mold, including a press-fitting frame 1, the press-fitting frame 1 is fixedly connected to the middle of the left and right sides with a hydraulic press 17, the middle of the right side of the hydraulic press 17 is slidably connected to a telescopic rod 16, the middle of the right side of the telescopic rod 16 is fixedly connected to a spindle positioning frame 2, the spindle positioning frame 2 is provided with a spindle slot 11 on the top front side of the right side, the press-fitting frame 1 is slidably connected to a crank neck positioning frame 4 on the middle inside, the crank neck positioning frame 4 is provided with a crank slot 10 on both sides, and the right middle and rear side of the crank neck positioning frame 4 is provided with a crank slot 12, the press-fitting frame 1 is slidably connected to the left and right sides with a crank positioning frame 3, the crank slot 10 is provided on the right side of the crank positioning frame 3, and the front and rear sides of the bottom of the left and right sides of the crank neck positioning frame 4 are fixed It is fixedly connected with a positioning rod 13, and a return spring 14 is inserted into the outside of the positioning rod 13. Spring holes 15 are provided on the front and back sides of the bottom right end of the crank positioning frame 3. The worker places the crankshaft main shaft 5, crankshaft crank 6 and crank neck 7 in the main shaft groove 11 in the main shaft positioning frame 2, the crank groove 10 in the crank positioning frame 3 and the crank neck groove 12 in the crank neck positioning frame 4 respectively, and then starts the hydraulic press 17. The hydraulic press 17 applies pressure to prompt the telescopic rod 16 to squeeze the main shaft positioning frame 2, the crank positioning frame 3 and the crank neck positioning frame 4 toward the center, so that the three components of the crankshaft complete the interference fit between the parts under the action of pressure. The positioning rod 13 at the bottom of the crank neck positioning frame 4 ensures that the positioning frames will not deviate, thereby ensuring the pressing accuracy.

[0032] Reference Figure 1 and Figure 3The four corners of the top of the pressing frame 1 are fixedly connected to the lifting frame 19, and the top of the lifting frame 19 is fixedly connected to the guide rail 23. The top of the outer side of the guide rail 23 is connected in a rolling manner with a moving wheel 24, and the middle of the moving wheel 24 is rotatably connected to the moving shaft 27. The middle of the outer side of the moving shaft 27 is fixedly connected to the moving platform 20, and the middle of the left and right sides of the bottom end of the moving platform 20 are fixedly connected. The cable box 25 is provided with a lifting cable 26, and the end of the lifting cable 26 is fixedly connected to a lifting ring 21. The crankshaft after pressing is placed on the crank slot 10 of the crankshaft positioning frame 3. At this time, the moving platform 20 moves on the guide rail 23 to above the crankshaft, and the lifting motor 22 transmits power to prompt the cable box 25 to release the lifting cable 26. The worker puts the lifting ring 21 on the lifting cable 26 into the crankshaft main shaft 5 at both ends of the crankshaft, retracts the lifting cable 26, and the mobile platform 20 transports the crankshaft to the next process through the guide rail 23, reducing manual handling and reducing work intensity.

[0033] Reference Figure 2-Figure 4 , a crankshaft neck 7 is placed on the inside of the crank neck groove 12, and the crankshaft crank 6 is fixedly connected to the left and right sides of the crankshaft neck 7, and the right front end of the crankshaft crank 6 is fixedly connected to the crankshaft main shaft 5. The front side of the right end of the crankshaft crank 6 is provided with an axis hole 8, and the rear side of the right end of the crankshaft crank 6 is provided with a pin hole 9. The four corners of the bottom end of the press-fitting frame 1 are fixedly connected to the support legs 18. The front and rear sides of the right bottom of the main shaft positioning frame 2 are provided with positioning holes, and the front and rear sides of the right bottom of the crank positioning frame 3 are provided with positioning holes. The left and right sides of the rear end of the outer side of the hydraulic press 17 are fixedly connected to the oil delivery port, and the lifting motor 22 is fixedly connected between the middle of the cable box 25, and the lifting motor 22 transmits power to the cable box 25 through the motor shaft. After the press-fitting is completed, the hydraulic press 17 releases the pressure, the telescopic rod 16 is recovered, and the main shaft positioning frame 2 is retracted. At the same time, the crank positioning frame 3 is separated from the crank neck positioning frame 4 under the push of the return spring 14.

[0034] Working principle: The worker places the crankshaft main shaft 5, crankshaft crank 6 and crank neck 7 in the main shaft slot 11 of the main shaft positioning frame 2, the crank slot 10 of the crank positioning frame 3 and the crank neck slot 12 of the crank neck positioning frame 4 respectively, and then starts the hydraulic press 17. The hydraulic press 17 applies pressure to prompt the telescopic rod 16 to squeeze the main shaft positioning frame 2, crank positioning frame 3 and crank neck positioning frame 4 toward the center, so that the three components of the crankshaft complete the interference fit between the parts under the action of pressure. After the press-fitting is completed, the hydraulic press 17 releases the pressure, the telescopic rod 16 retracts, and the main shaft positioning frame 2 is retracted. At the same time, the crank positioning frame 3 Driven by the return spring 14, it is separated from the crank neck positioning frame 4. The positioning rod 13 at the bottom of the crank neck positioning frame 4 ensures that the positioning frames will not deviate, ensuring the pressing accuracy. After the pressing is completed, the crankshaft is placed in the crank groove 10 of the crankshaft positioning frame 3. At this time, the mobile platform 20 moves on the guide rail 23 to above the crankshaft, and the lifting motor 22 transmits power to prompt the cable box 25 to release the lifting cable 26. The worker puts the lifting ring 21 on the lifting cable 26 into the crankshaft main shaft 5 at both ends of the crankshaft, retracts the lifting cable 26, and the mobile platform 20 transports the crankshaft to the next process through the guide rail 23, reducing manual handling and reducing work intensity.

[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A motorcycle crankshaft press-fitting die, comprising a press-fitting frame (1), characterized in that: The middle of the left and right sides of the press-fitting frame (1) are fixedly connected to a hydraulic press (17), the middle of the right side of the hydraulic press (17) is slidably connected to a telescopic rod (16), the middle of the right side of the telescopic rod (16) is fixedly connected to a spindle positioning frame (2), the front side of the right top of the spindle positioning frame (2) is provided with a spindle slot (11), the middle of the inner side of the press-fitting frame (1) is slidably connected to a curved neck positioning frame (4), the left and right sides of the curved neck positioning frame (4) are provided with a crank slot (10), the middle and rear side of the right side of the curved neck positioning frame (4) is provided with a curved neck slot (12), the left and right sides of the inner side of the press-fitting frame (1) are slidably connected to a crank positioning frame (3), the A crank slot (10) is provided on the right side of the crank positioning frame (3); the four corners of the top of the press frame (1) are fixedly connected to a hanging frame (19); the top of the hanging frame (19) is fixedly connected to a guide rail (23); the top of the outer side of the guide rail (23) is connected in a rolling manner to a moving wheel (24); the middle of the moving wheel (24) is connected in a rotating manner to a moving shaft (27); the middle of the outer side of the moving shaft (27) is fixedly connected to a moving platform (20); the middle of the left and right sides of the bottom of the moving platform (20) are fixedly connected to a cable box (25); the cable box (25) is provided with a suspension cable (26); the end of the suspension cable (26) is fixedly connected to a lifting ring (21).

2. The motorcycle crankshaft press-fitting die according to claim 1, characterized in that: A crankshaft crank (7) is placed inside the crankshaft groove (12), and a crankshaft crank (6) is fixedly connected to the left and right sides of the crankshaft crank (7), and a crankshaft main shaft (5) is fixedly connected to the front side of the right end of the crankshaft crank (6). A shaft hole (8) is opened at the front side of the right end of the crankshaft crank (6), and a pin hole (9) is opened at the rear side of the right end of the crankshaft crank (6).

3. The motorcycle crankshaft press-fitting die according to claim 1, characterized in that: Support legs (18) are fixedly connected to the four corners of the bottom end of the press-fitting frame (1).

4. The motorcycle crankshaft press-fitting die according to claim 1, characterized in that: Positioning holes are provided on the front and rear sides of the right bottom of the spindle positioning frame (2), and positioning holes are provided on the front and rear sides of the right bottom of the crank positioning frame (3).

5. The motorcycle crankshaft press-fitting die according to claim 1, characterized in that: The left and right sides of the rear end of the outer side of the hydraulic press (17) are fixedly connected with oil delivery ports.

6. The motorcycle crankshaft press-fitting die according to claim 1, characterized in that: Positioning rods (13) are fixedly connected to the front and rear sides of the bottoms of the left and right sides of the curved neck positioning frame (4), and a return spring (14) is sleeved on the outside of the positioning rods (13).

7. The motorcycle crankshaft press-fitting die according to claim 1, characterized in that: The crank positioning frame (3) is provided with spring holes (15) on the front and rear sides of the bottom right end.

8. The motorcycle crankshaft press-fitting die according to claim 1, characterized in that: A hoisting motor (22) is fixedly connected to the middle of the cable box (25), and the hoisting motor (22) transmits power to the cable box (25) via a motor shaft.

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