A device for installing a motorcycle crank gear shaft sleeve with interference fit and a method thereof

Abstract

The application provides a kind of automatic motorcycle crank gear shaft sleeve interference fit installation device and its installation method, it mainly includes first automatic feeding mechanical arm, second automatic feeding mechanical arm, base fixture and hydraulic punch, the application realizes the automatic installation of motorcycle crank gear shaft sleeve interference fit.The application adopts first automatic feeding mechanical arm, second automatic feeding mechanical arm and base fixture, the first, second automatic feeding mechanical arm of the application realizes accurate capture, the structure of base fixture can realize accurate positioning, so as to improve the positioning accuracy of interference fit between motorcycle crank and gear shaft sleeve.The end of the first automatic feeding mechanical arm and the second automatic feeding mechanical arm of the application is equipped with a grabbing structure, two grabbing holes are respectively arranged in the two grabbing structures, so that fast automatic feeding and discharging can be realized and the material changing time is reduced, at the same time, the safety hazards caused by manual operation can be avoided, and the application has the characteristics of high safety factor.

Description

Technical Field

[0001] This invention relates to the field of hydraulic clamping fixtures, specifically to an automated installation device and method for an interference fit of a crank gear bushing in a motorcycle. Background Technology

[0002] Motorcycle engine crankshafts typically have a gear bushing mounted at the bottom of the central shaft. Its primary function is to prevent the gear shaft from shifting due to vibration during operation. It also provides lubrication, heat dissipation, friction reduction, and extends the crankshaft's lifespan. This is a crucial step in the crankshaft installation process. Furthermore, this step requires a high-powered hydraulic press to provide axial pressure to secure the gear bushing in place. Manual operation poses significant safety hazards, is inefficient, and involves high labor intensity. Automating this process could fundamentally eliminate accidents, improve work efficiency, and reduce personnel costs. Summary of the Invention

[0003] This invention provides an automated installation device and method for interference fit of motorcycle crank gear bushings. It can not only meet the automated assembly requirements of crank gear bushings of different models of motorcycles, but also realize the automated installation of interference fit of motorcycle crank gear bushings.

[0004] This invention employs the following technical solution: an automated interference fit installation device for a motorcycle crankshaft and gear bushing, mainly comprising a first automatic feeding robotic arm, a second automatic feeding robotic arm, a base clamp, and a hydraulic punch. The first and second automatic feeding robotic arms are mounted on both sides of the base clamp. A hydraulic press is connected to the hydraulic punch. The lower end of the first automatic feeding robotic arm is mounted on the side chamber I of a base I and is connected to the drive device I within the base I. A rotary motor I is mounted on the upper end of the first automatic feeding robotic arm. The output shaft of the rotary motor I is vertically downward and connected to the horizontal gripping structure I. The rotary motor I drives the gripping structure I to rotate horizontally. Gripping holes I are provided at both ends of the gripping structure I. The lower end of the second automatic feeding robotic arm is mounted on the side chamber II of a base II and is connected to the drive device II within the base II. A rotary motor II is mounted on the upper end of the second automatic feeding robotic arm. The output shaft of the rotary motor II is vertically downward and connected to the horizontal gripping structure II. The rotary motor II drives the gripping structure II to rotate horizontally. The gripping structure II has gripping holes II at both ends. The base fixture mainly includes a base, with a central shaft positioning block installed at the center of the upper surface of the base. Several centering clamping claws are evenly distributed on the side of the central shaft positioning block. The central shaft positioning block is installed on the upper surface of the base through the several centering clamping claws. A planar positioning block is installed on the central shaft positioning block. A stepped groove is provided at the center of the planar positioning block. The size of the stepped groove corresponds to that of the gear bushing. The center of the stepped groove, the center of the central shaft positioning block, and the center of the base are concentrically set. The hydraulic punch is downward. Corresponding to the position of the stepped groove, a limiting clamp is also provided on one side of the planar positioning block. The adjustable top block is located in the limiting clamp and is positioned by the fastening screw on the side of the limiting clamp. The protrusion at one end of the adjustable top block is located in the stepped groove. When installation is required, the gear bushing is first gripped and placed in the stepped groove. Then, the motorcycle crank is gripped and the gear shaft of the motorcycle crank is aligned with the gear bushing and placed in. After being stamped by the hydraulic punch, an interference fit is performed. When it is necessary to position the gear bushing placed in the stepped groove, the adjustable top block is adjusted to fix the position of the gear bushing.

[0005] Furthermore, the central shaft positioning block has three centering clamping claws evenly distributed on its side. The three sets of centering clamping claws are installed at 120° intervals to ensure that the center of gravity of the central shaft positioning block is at the center of the base.

[0006] Furthermore, the planar positioning block and the central axis positioning block are positioned by installing positioning pins.

[0007] Furthermore, the hydraulic punch is made of hard rubber material.

[0008] Furthermore, the base I of the first automatic feeding robot arm is provided with a base plate I at the bottom, and fixed threaded holes I are distributed on the base plate I. The base plate I is fixedly connected to the mounting platform by inserting bolts through the fixed threaded holes I. A motor cover plate I is provided on the upper part of the base I. The driving device I is a driving stepper motor. The driving device I is located in the cavity between the base plate I and the motor cover plate I. The side chamber I is installed on the side of the motor cover plate I. The driving device I is connected to the rear arm I and the front arm I of the first automatic feeding robot arm through a transmission mechanism.

[0009] The base II of the second automatic feeding robot arm is provided with a base plate II at its bottom. Fixed threaded holes II are distributed on the base plate II. The base plate II is fixedly connected to the mounting platform by inserting bolts through the fixed threaded holes II. A motor cover plate II is provided on the upper part of the base II. The driving device II is a stepper motor. The driving device II is located in the cavity between the base plate II and the motor cover plate II. The side chamber II is installed on the side of the motor cover plate II. The driving device II is connected to the rear arm II and the front arm II of the second automatic feeding robot arm through a transmission mechanism.

[0010] Furthermore, gripping structure I and gripping structure II are designed as flat plate structures.

[0011] Furthermore, the base has an adjustment knob on its side.

[0012] This invention also provides an interference fit installation method for an automated motorcycle crankshaft and gear bushing, which includes the following steps:

[0013] Step 1: First, drive the first automatic feeding robot arm to make it move. Then, use the gripping holes I at both ends of the gripping structure I to grip two gear bushings respectively. Place one of the gear bushings accurately into the stepped groove in the center of the adjusted planar positioning block. Adjust the adjustable top block to position the gear bushing. The other one is reserved.

[0014] Step 2: Next, drive the second automatic feeding robot arm to make the first automatic feeding robot arm move. Then, use the gripping holes 2 at both ends of the gripping structure 2 to grip two motorcycle cranks respectively, and accurately place the gear shaft of one of the motorcycle cranks into the gear shaft sleeve that was placed in the stepped groove in step 1. The other one is reserved.

[0015] Step 3: After the workpiece is moved into place in Step 1 and Step 2, the hydraulic press starts automatically and drives the hydraulic punch to feed in the negative direction of the Z-axis to press the gear shaft of the motorcycle crank into the gear bushing and form an interference fit with the gear bushing, thus completing the interference fit of the motorcycle crank and gear bushing.

[0016] Step 4: Release the adjustable top block, drive the second automatic feeding robot arm to lift the assembled workpiece to a certain height, and then rotate the gripping structure II 180° by the rotary motor II to stand by. The rotary motor I on the first automatic feeding robot arm will also rotate the gripping structure I 180° to place the spare gear bushing into the stepped groove. Then adjust the adjustable top block to position the spare gear bushing. Then the second automatic feeding robot arm will also place the spare gear shaft of the other motorcycle crank into the stepped groove and the spare gear bushing.

[0017] Step 5: The hydraulic press automatically restarts, driving the hydraulic punch to feed in the negative Z-axis direction, pressing the spare motorcycle crank gear shaft into the spare gear bushing to form an interference fit. This completes the interference fit between the spare motorcycle crank and the spare gear bushing. The adjustable top block is then released, driving the second automatic feeding robot arm to lift the other assembled workpiece to a certain height, thus removing both assembled workpieces. Furthermore, the upper limit deviation d1 of the tight-fit outer cylindrical shaft dimension D1 of the motorcycle crank is in the range of 0.01 ≤ d1 ≤ 0.05, while the lower limit deviation d2 of the tight-fit inner diameter D2 of the gear bushing is in the range of 0.01 ≤ d2 ≤ 0.05.

[0018] This invention has the following beneficial effects: By adopting the above technical solution, this invention not only meets the automated assembly requirements of crank gear bushings for different models of motorcycles, but also enables automated installation of interference fits between motorcycle crank gear bushings. Furthermore, it has advantages such as novel structure and high production efficiency. This invention employs a first automatic feeding robotic arm, a second automatic feeding robotic arm, and a base clamp. The first and second automatic feeding robotic arms achieve precise gripping, and the base clamp structure enables precise positioning, thereby improving the positioning accuracy of the interference fit between the motorcycle crank and gear bushing. The ends of the first and second automatic feeding robotic arms are equipped with gripping structures, each with two gripping holes. This enables rapid automated loading and unloading and reduces material change time, while avoiding safety hazards associated with manual operation, thus exhibiting a high safety factor. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the base clamp of the present invention.

[0021] Figure 3 This is a schematic diagram of the assembly position of the motorcycle crank and gear shaft assembly according to the present invention.

[0022] Figure 4This is a schematic diagram of the assembly dimensions of the motorcycle crank and gear shaft assembly of the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of the first automatic feeding robotic arm and the second automatic feeding robotic arm of the present invention. Detailed Implementation

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] exist Figure 1 , Figure 3 and Figure 4 This invention provides an automated interference fit installation device for a motorcycle crankshaft and gear bushing. It mainly includes a first automatic feeding robotic arm 5, a second automatic feeding robotic arm 6, a base clamp 1, and a hydraulic punch 4. The first and second automatic feeding robotic arms 5 and 6 are mounted on opposite sides of the base clamp 1. A hydraulic press is connected to the hydraulic punch 4.

[0026] exist Figure 5 In this design, the lower end of the first automatic feeding robotic arm 5 is mounted on the side chamber 1505 of the base 1502 and is connected to the drive device 1 inside the base 1502. A rotary motor 1508 is mounted on the upper end of the first automatic feeding robotic arm 5. The output shaft of the rotary motor 1508 is vertically downward and connected to the horizontal gripping structure 1509. The rotary motor 1508 drives the gripping structure 1509 to rotate in the horizontal direction. Gripping holes 1510 are provided at both ends of the gripping structure 1509.

[0027] The lower end of the second automatic feeding robotic arm 6 is mounted on the side chamber II 605 of the base II 602 and is connected to the drive device II inside the base II 602. A rotary motor II 608 is mounted on the upper end of the second automatic feeding robotic arm 6. The output shaft of the rotary motor II 608 is vertically downward and connected to the horizontal gripping structure II 609. The rotary motor II 608 drives the gripping structure II 609 to rotate in the horizontal direction. Gripping holes II 610 are provided at both ends of the gripping structure II 609.

[0028] exist Figure 2In this structure, the base clamp 1 mainly includes a base 101. A central shaft positioning block 104 is installed at the center of the upper surface of the base 101. Several centering clamping claws 103 are evenly distributed on the side of the central shaft positioning block 104. The central shaft positioning block 104 is installed on the upper surface of the base 101 through the several centering clamping claws 103. A planar positioning block 105 is installed on the central shaft positioning block 104. A stepped groove 106 is provided at the center of the planar positioning block 105. The stepped groove 106 corresponds to the size of the gear bushing 2. The center of the stepped groove 106 is aligned with the center of the central shaft positioning block 104 and the center of the base 101. The center of 01 is concentrically set, with the hydraulic punch 4 facing downwards and corresponding to the position of the stepped groove 106. A limiting clamp 110 is also provided on one side of the planar positioning block 105. The adjustable top block 108 is located within the limiting clamp 110 and positioned by the fastening screw 109 on the side of the limiting clamp 110. The protrusion at one end of the adjustable top block 108 is located within the stepped groove 106. When installation is required, first, the gear bushing 2 is gripped and placed into the stepped groove 106. Then, the motorcycle crank 3 is gripped, and the gear shaft of the motorcycle crank 3 is aligned with the gear bushing 2 and inserted. After being stamped by the hydraulic punch 4, an interference fit is achieved. When positioning the gear bushing 2 placed in the stepped groove 106, adjust the adjustable top block 108 to fix the position of the gear bushing 2. In this embodiment, three centering clamping claws 103 are evenly distributed on the side of the central shaft positioning block 104. The three sets of centering clamping claws 103 are installed at 120° intervals to ensure that the center of gravity of the central shaft positioning block 104 is at the center of the base. In this embodiment, the planar positioning block 105 and the central shaft positioning block 104 are positioned by installing positioning pins 107. In this embodiment, the hydraulic punch 4 is made of hard rubber material. In this embodiment, the base I5 of the first automatic feeding robot arm 5 is... 02 The bottom is provided with a base plate I501, and fixed threaded holes I503 are distributed on the base plate I501. The base plate I502 is fixedly connected to the mounting platform by inserting bolts through the fixed threaded holes I503. The upper part of the base I502 is provided with a motor cover plate I504. The drive device I is a drive stepper motor. The drive device I is located in the cavity between the base plate I501 and the motor cover plate I504 of the base I502. The side chamber I505 is installed on the side of the motor cover plate I504. The drive device I is connected to the rear arm I506 and the front arm I507 of the first automatic feeding robot arm 5 through a transmission mechanism.The second automatic feeding robotic arm 6 has a base plate II 601 at the bottom of its base II 602. Fixed threaded holes II 603 are distributed on the base plate II 601. Bolts are inserted into the base plate II 601 through the fixed threaded holes II 603 to fix it to the mounting platform. A motor cover plate II 604 is provided on the upper part of the base II 602. The drive device II is a stepper motor and is located in the cavity between the base plate II 601 and the motor cover plate II 604. A side chamber II 605 is installed on the side of the motor cover plate II 604. The drive device II is connected to the rear arm II 606 and the front arm II 607 ​​of the second automatic feeding robotic arm 6 via a transmission mechanism. In this embodiment, the gripping structure I 509 and gripping structure II 609 are set as flat plate structures. An adjustment knob 102 is provided on the side of the base 101 in this embodiment.

[0029] This invention also provides an interference fit installation method for an automated motorcycle crankshaft and gear bushing, which includes the following steps:

[0030] Step 1: First, drive the first automatic feeding robot arm 5 so that after the first automatic feeding robot arm 5 moves, use the gripping holes I510 at both ends of the gripping structure I509 to grip two gear bushings 2 respectively, and accurately place one of the gear bushings 2 into the stepped groove 106 in the center of the adjusted planar positioning block 105. Adjust the adjustable top block 108 to position the gear bushing 2, and keep the other one as a spare.

[0031] Step 2: Next, drive the second automatic feeding robot arm 6 to make the first automatic feeding robot arm move. Then, use the gripping holes II 610 at both ends of the gripping structure II 609 to grip two motorcycle cranks 3 respectively, and accurately put the gear shaft of one of the motorcycle cranks 3 into the gear shaft sleeve 2 that was put into the stepped groove 106 in step 1. The other one is reserved.

[0032] Step 3: After the workpiece is moved into place in Step 1 and Step 2, the hydraulic press is automatically started and the hydraulic punch 4 is driven to feed in the negative direction of the Z axis to press the gear shaft of the motorcycle crank 3 into the gear bushing 2 and form an interference fit with the gear bushing 2, thus completing the interference fit between the motorcycle crank 3 and the gear bushing 2.

[0033] Step 4: Release the adjustable top block 108, drive the second automatic feeding robot arm 6 to lift the assembled workpiece to a certain height, and then rotate the gripping structure II 610 180° by the rotary motor II 608 to stand by. The rotary motor I 508 on the first automatic feeding robot arm 5 will also rotate the gripping structure I 509 180° to place the spare gear bushing 2 into the stepped groove 106. Then adjust the adjustable top block 108 to position the spare gear bushing 2. Then the second automatic feeding robot arm 6 will also place the spare gear shaft of the other motorcycle crank 3 into the stepped groove 106 and the spare gear bushing 2.

[0034] Step five: The hydraulic press automatically restarts again, driving the hydraulic punch 4 to feed in the negative Z-axis direction, pressing the gear shaft of the spare motorcycle crank 3 into the spare gear bushing 2 to form an interference fit, completing the interference fit between the spare motorcycle crank 3 and the spare gear bushing 2. The adjustable top block is then released, driving the second automatic feeding robotic arm 6 to lift the other assembled workpiece to a certain height, thus removing both assembled workpieces. Figure 4 In this embodiment, the upper limit deviation d1 of the outer cylindrical shaft 31 of the motorcycle crank 3 is 0.01≤d1≤0.05, while the lower limit deviation d2 of the inner diameter D2 of the gear bushing 2 is 0.01≤d2≤0.05.

[0035] The technical solutions provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the embodiments above are only for helping to understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A device for the interference fit installation of a motorcycle crank and gear shaft sleeve, characterized in that It mainly includes first automatic feeding mechanical arm (5), second automatic feeding mechanical arm (6), base clamp (1) and hydraulic punch (4), first automatic feeding mechanical arm (5) and second automatic feeding mechanical arm (6) are installed on both sides of base clamp (1), and hydraulic punch (4) is connected with hydraulic machine, The lower end of the first automatic feeding mechanical arm (5) is installed on the side chamber I (505) of the bed I (502) and is in transmission connection with the driving device I in the bed I (502), a rotary motor I (508) is installed on the upper end of the first automatic feeding mechanical arm (5), the output shaft of the rotary motor I (508) is vertically downwardly in transmission connection with the horizontal grabbing structure I (509), the rotary motor I (508) drives the grabbing structure I (509) to rotate in the horizontal direction, grabbing holes I (510) are arranged at both ends of the grabbing structure I (509), The lower end of the second automatic feeding mechanical arm (6) is installed on the side chamber II (605) of the bed II (602) and is in transmission connection with the driving device II in the bed II (602), a rotary motor II (608) is installed on the upper end of the second automatic feeding mechanical arm (6), the output shaft of the rotary motor II (608) is vertically downwardly in transmission connection with the horizontal grabbing structure II (609), the rotary motor II (608) drives the grabbing structure II (609) to rotate in the horizontal direction, grabbing holes II (610) are arranged at both ends of the grabbing structure II (609), The base clamp (1) mainly includes a base (101), a center shaft positioning block (104) is installed on the upper surface center of the base (101), a plurality of centering clamping jaws (103) are uniformly distributed on the side surface of the center shaft positioning block (104), the center shaft positioning block (104) is installed on the upper surface of the base (101) through the plurality of centering clamping jaws (103), a planar positioning block (105) is installed on the center shaft positioning block (104), a stepped groove (106) is arranged in the center of the planar positioning block (105), the size of the stepped groove (106) corresponds to that of the gear shaft sleeve (2), the center of the stepped groove (106) is concentrically arranged with the center of the center shaft positioning block (104) and the center of the base (101), the hydraulic punch (4) is downwardly positioned corresponding to the position of the stepped groove (106), a limiting clamp (110) is further arranged on one side of the planar positioning block (105), an adjustable jack (108) is positioned in the limiting clamp (110) through the fastening screw (109) on the side surface of the limiting clamp (110), the protrusion at one end of the adjustable jack (108) is located in the stepped groove (106), when installation is needed, first, the gear shaft sleeve (2) is grabbed and placed into the stepped groove (106), then the motorcycle crank (3) is grabbed, the gear shaft of the motorcycle crank (3) is aligned with the gear shaft sleeve (2) and placed into the stepped groove (106), and after being stamped by the hydraulic punch (4), the motorcycle crank (3) is installed in interference fit, when the gear shaft sleeve (2) placed in the stepped groove (106) needs to be positioned, the adjustable jack (108) is adjusted to fix the position of the gear shaft sleeve (2).

2. The automatic interference fit installation device of motorcycle crank and gear shaft sleeve according to claim 1, characterized in that The side surface of the center shaft positioning block (104) is uniformly distributed with three centering clamping jaws (103), and the three sets of centering clamping jaws (103) are installed at intervals of 120° to ensure that the center of gravity of the center shaft positioning block (104) is at the center of the base.

3. The automatic interference fit installation device of motorcycle crank and gear shaft sleeve as claimed in claim 1 wherein The planar positioning block (105) is positioned with the center shaft positioning block (104) through the installation of a positioning pin (107).

4. The automatic interference fit installation device of motorcycle crank and gear shaft sleeve as claimed in claim 1 wherein The hydraulic punch (4) is made of hard rubber material.

5. The automated interference fit installation device of motorcycle crank and gear shaft sleeve as claimed in claim 1 wherein The bottom of the first automatic feeding mechanical arm (5) is provided with a bottom plate I (501), and a fixed threaded hole I (503) is distributed on the bottom plate I (501). The bottom plate I (502) is fixedly connected with the installation platform through the fixed threaded hole I (503) inserted into the bolt. The upper part of the base I (502) is provided with a motor cover plate I (504). The driving device I is a driving stepper motor. The driving device I is located in the cavity between the bottom plate I (501) and the motor cover plate I (504) of the base I (502). The side chamber I (505) is installed on the side of the motor cover plate I (504). The driving device I is in transmission connection with the rear arm I (506) and the front arm I (507) of the first automatic feeding mechanical arm (5) through a transmission mechanism. The bottom of the second automatic feeding mechanical arm (6) is provided with a bottom plate II (601), and a fixed threaded hole II (603) is distributed on the bottom plate II (601). The bottom plate II (601) is fixedly connected with the installation platform through the fixed threaded hole II (603) inserted into the bolt. The upper part of the base II (602) is provided with a motor cover plate II (604). The driving device II is a driving stepper motor. The driving device II is located in the cavity between the bottom plate II (601) and the motor cover plate II (604) of the base II (602). The side chamber II (605) is installed on the side of the motor cover plate II (604). The driving device II is in transmission connection with the rear arm II (606) and the front arm II (607) of the second automatic feeding mechanical arm (6) through a transmission mechanism.

6. The automated interference fit installation device of a motorcycle crank and gear shaft sleeve of claim 1, wherein The grabbing structure I (509) and the grabbing structure II (609) are provided in the form of a flat plate.

7. The automated interference fit installation device of motorcycle crank and gear shaft sleeve as claimed in claim 1 wherein The base (101) is provided with an adjusting knob (102) on the side surface.

8. A method of installing a motorcycle crank and gear shaft sleeve with interference fit using the automated motorcycle crank and gear shaft sleeve interference fit installation device of claim 1, characterized in that it The method comprises the following steps: Step one: first drive the first automatic feeding mechanical arm (5) to move, then use the grabbing holes I (510) at both ends of the grabbing structure I (509) to clamp two gear shaft sleeves (2) respectively, and accurately place one of the gear shaft sleeves (2) into the stepped groove (106) at the center of the adjusted planar positioning block (105). The other one is reserved. Step two: secondly drive the second automatic feeding mechanical arm (6) to move, then use the grabbing holes II (610) at both ends of the grabbing structure II (609) to clamp two motorcycle cranks (3) respectively, and accurately place the gear shaft of one of the motorcycle cranks (3) into the gear shaft sleeve (2) placed in the stepped groove (106) in step one. The other one is reserved. Step three, after the workpiece is in place after moving through step one and step two, the hydraulic machine is automatically started to drive the hydraulic punch (4) to feed in the negative direction of the Z axis to press the gear shaft of the motorcycle crank (3) into the gear shaft sleeve (2) to form an interference assembly with the gear shaft sleeve (2), completing the interference assembly of the motorcycle crank (3) and the gear shaft sleeve (2); Step four, loosen the adjustable top block (108), drive the second automatic feeding mechanical arm (6) to lift the assembled workpiece to a certain height, then rotate the grabbing structure II (610) by 180° through the rotary motor II (608) standby, the rotary motor I (508) on the first automatic feeding mechanical arm (5) also rotates the grabbing structure I (509) by 180°, places another spare gear shaft sleeve (2) in the stepped groove (106), adjusts the adjustable top block (108) to position the other gear shaft sleeve (2), and then the second automatic feeding mechanical arm (6) places another spare motorcycle crank (3) gear shaft in the stepped groove (106) inside the other spare gear shaft sleeve (2); Step five, the hydraulic machine is automatically started again to drive the hydraulic punch (4) to feed in the negative direction of the Z axis to press the gear shaft of the spare motorcycle crank (3) into the spare gear shaft sleeve (2) to form an interference assembly with the spare gear shaft sleeve (2), completing the interference assembly of the spare motorcycle crank (3) and the spare gear shaft sleeve (2), loosening the adjustable top block, driving the second automatic feeding mechanical arm (6) to lift the other assembled workpiece to a certain height, and taking out the two assembled workpieces.

9. The method of interference fit installation of motorcycle crank and gear shaft sleeve as claimed in claim 8 wherein The upper limit deviation d1 of the size D1 of the motorcycle crank (3) tight fitting outer circle shaft (31) is in the range of 0.01≤d1≤0.05, and the lower limit deviation d2 of the diameter D2 of the tight fitting inner hole (21) of the gear shaft sleeve (2) is in the range of 0.01≤d2≤0.05.

Images