Motor shaft and worm assembly device and assembly method

Abstract

The present application relates to a kind of motor shaft and worm assembly device and assembly method, motor shaft and worm assembly device includes support plate, the middle part of the support plate is equipped with through-hole, the inner side of the through-hole is equipped with annular support block for supporting motor stop position, the lower side of the annular support block is equipped with counterweight, the middle part of the counterweight is equipped with perforation, the inner diameter of the perforation is less than the outer diameter of worm, the lower side of the counterweight is equipped with drive cylinder for pressing worm to motor shaft.The assembly method of motor shaft and worm assembly device includes the following steps: S1, motor is assembled to support plate, and make motor shaft downward;S2, worm is assembled to connecting rod end, and worm is heated;S3, start pressure cylinder, drive pressing block and press tightly motor downward;S4, start drive cylinder, and press heated worm to motor shaft upward;S5, control connecting rod returns to original position, and cancel the press tightly of motor.

Description

Technical Field

[0001] This invention relates to an assembly device and assembly method, specifically to an assembly device and assembly method for a motor output shaft and a worm gear. Background Technology

[0002] In existing technologies, worm gears are typically mounted on the output shaft of motors. Current motor worm gear assembly equipment generally uses cylinder-type worm gear assembly equipment for low-precision crimping, resulting in large dimensional fluctuations and difficulty in matching other parts. Cylinder-type worm gear assembly equipment lacks pressure control during assembly, posing a risk of product damage due to insufficient crimping force or excessive pressure. Furthermore, when using cylinder-type worm gear assembly equipment to assemble different types of worm gears to meet various production needs, it requires significant manpower for frequent changes of different worm gear models, resulting in slow changeover times and complex processes.

[0003] A smart motor worm gear assembly device is disclosed in publication document CN107900644A, mainly used in automotive rearview mirror folding assembly equipment. The smart motor worm gear assembly device includes a bracket, a pressing base, a servo motor system, a PLC communication control system, and a human-machine interface. Safety light curtains and warning lights are provided on all four sides of the equipment housing. The servo motor system includes a servo cylinder and preset parameters. The human-machine interface includes a system start / stop button, a speed parameter adjustment button, a pressure parameter adjustment button, a numeric keypad area, and a pressing real-time position display screen. The pressing real-time position display screen includes a total displacement display screen and a pressing displacement display screen. The servo motor system is set with an upper limit and a lower limit for the axial running position.

[0004] When assembling the motor output shaft and worm gear, some of the motor output shafts are smooth shafts with no limit step. This makes it impossible to limit the position of the worm gear when pressing the smooth shaft, and the axial assembly position of the worm gear on the smooth shaft is prone to deviation. The worm gear cannot be accurately assembled at the limited position on the smooth shaft. Summary of the Invention

[0005] The purpose of this invention is to provide a motor output shaft and worm gear assembly device and assembly method, which solves the problems of easy deviation in the axial position of the worm gear assembly shaft and inaccurate assembly position in the prior art.

[0006] The above-mentioned technical objective of the present invention is mainly achieved through the following technical solution: a motor output shaft and worm gear assembly device, comprising a support plate, a through hole in the middle of the support plate, an annular support block for supporting the motor stop position on the inner side of the through hole, a counterweight block movably connected to the annular support block and movable up and down below the annular support block, a through hole in the middle of the counterweight block for the motor output shaft to pass downward through the counterweight block, the inner diameter of the through hole being smaller than the outer diameter of the worm gear, and a driving air for pressing the worm gear onto the motor output shaft below the counterweight block. The aforementioned annular support block supports the motor, allowing the motor output shaft to pass downwards through the through hole in the counterweight block for easy assembly of the worm gear. The counterweight block's design ensures that when the drive cylinder presses the worm gear onto the motor output shaft, it momentarily blocks the upward movement of the worm gear on the motor output shaft. This counterweight block counteracts the worm gear's inertia during its upward movement, keeping it within a designated position range on the motor output shaft. This improves the accuracy of the worm gear's position on the motor output shaft, prevents positional deviations, and ensures assembly quality.

[0007] Preferably, the bottom of the annular support block is provided with multiple guide rods extending downward and passing through the counterweight block. The counterweight block is provided with guide holes for cooperating with the guide rods. The guide rods are provided with annular limiting parts on the side wall of the end located below the counterweight block. The guide rods are provided to cooperate with the guide holes to guide the up and down movement of the counterweight block, ensuring the normal and smooth movement of the counterweight block and preventing the counterweight block from deviating during movement, which would affect the accuracy of the worm gear assembly position. The annular limiting parts can limit and support the counterweight block, preventing the counterweight block from detaching from the guide rods.

[0008] Preferably, the annular support block is provided with multiple threaded holes, and the end of the guide rod connected to the annular support block is provided with a threaded section that mates with the threaded holes; the engagement of the threaded holes and the threaded section facilitates the fixing of the guide rod and maintains its stability. At the same time, the distance between the lower end of the guide rod and the annular support block can be adjusted through the threaded holes to adapt to different assembly requirements. Furthermore, the guide rod can be disassembled through the threads to replace the counterweight block of different weights as needed.

[0009] Preferably, the annular support block has an annular outer edge portion located on the top surface of the support plate at its upper outer edge. The annular outer edge portion is provided so that the annular support block can be supported inside the through hole and abut against the end face of the motor. The annular support block can be fixed by pressing down the annular outer edge portion with the weight of the motor. At the same time, it is convenient to disassemble the annular support block for maintenance and replacement.

[0010] Preferably, the annular support block, the counterweight block, and the outer edge of the annular portion have openings on the same side; the openings facilitate the lateral movement of the assembled motor and the insertion of the unassembled motor, increasing the convenience of loading and unloading and saving more effort.

[0011] Preferably, a base plate is provided below the support plate, and the drive cylinder is located at the bottom of the base plate. The cylinder rod of the drive cylinder is arranged upward, and a connecting rod is fixed to the upper end of the cylinder rod of the drive cylinder through a connecting block. The connecting rod passes upward through the base plate and is coaxial with the motor output shaft. The end of the connecting rod is provided with a pin that is coaxial with the connecting rod and can move up and down. The above-mentioned connecting rod arrangement allows the worm gear to be placed vertically at the end of the connecting rod through the pin, which facilitates pressing the worm gear onto the motor output shaft. At the same time, it can also position the worm gear to ensure that the worm gear can be accurately pressed onto the motor output shaft and avoid deviation in the position of the worm gear.

[0012] Preferably, the connecting rod has a fixed cavity inside, and a telescopic spring is provided inside the fixed cavity. The pin extends through the connecting rod into the fixed cavity and is connected to the upper end of the telescopic spring. The bottom end of the pin has an annular protrusion that abuts against the side wall of the fixed cavity. The telescopic spring allows the pin to elastically extend and retract at the upper end of the connecting rod. Thus, when the worm is pressed against the motor output shaft, the pin can be pressed down and move towards the fixed cavity simultaneously, preventing the pin from pressing against the motor output shaft and causing the worm to be unable to move upward, which would damage the equipment.

[0013] Preferably, a top plate is provided above the support plate, and a pressure cylinder is provided on the top plate. The cylinder rod of the pressure cylinder extends downward through the top plate to below the top plate, and a pressure block is provided at the end of the cylinder rod. The pressure cylinder is provided so that when assembling the worm gear, the motor is pressed firmly on the support plate by the pressure block to keep the motor stable and avoid the motor from shifting during assembly, which would affect the assembly of the worm gear.

[0014] Preferably, the assembly method of the motor output shaft and the worm gear assembly device includes the following steps:

[0015] S1. Assemble the motor onto the support plate, so that the motor shaft is pointing downwards;

[0016] S2. Assemble the worm gear to the end of the connecting rod and heat the worm gear;

[0017] S3. Start the pressure cylinder to drive the pressure block to press down on the motor;

[0018] S4. Start the drive cylinder to press the heated worm gear upward onto the motor output shaft;

[0019] S5. Control the connecting rod to return to its original position and release the clamping force on the motor;

[0020] The above method ensures that after the worm gear is mounted upwards onto the motor output shaft, it can be precisely mounted within the accurate position range of the motor output shaft, effectively avoiding deviation in the axial position of the worm gear on the motor output shaft. At the same time, the worm gear assembly is simple, accurate, convenient, and reliable.

[0021] Therefore, the present invention has the advantages of being able to assemble the worm gear within a specified position range on the motor output shaft, improving the positional accuracy of the worm gear assembly on the motor output shaft, avoiding deviations in the worm gear position, and ensuring assembly quality. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 yes Figure 1 A schematic diagram of the structure in which the annular support block and counterweight block work together;

[0024] Figure 3 yes Figure 2 A cross-sectional view of the structure in which the annular support block and counterweight block are combined.

[0025] Figure 4 yes Figure 1 A schematic diagram of the worm gear on the connecting rod. Detailed Implementation

[0026] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0027] like Figure 1-2 As shown, a motor output shaft and worm gear assembly device includes a support plate 1. The support plate 1 has a through hole 11 in the middle. An annular support block 2 for supporting the motor stop position is provided inside the through hole 11. A counterweight block 21 is provided below the annular support block 2 and is movably connected to the annular support block 2 and can move up and down. A through hole 211 is provided in the middle of the counterweight block 21 for the motor output shaft to pass downward through the counterweight block 21. The inner diameter of the through hole 211 is smaller than the outer diameter of the worm gear. A drive cylinder 3 for pressing the worm gear onto the motor output shaft is provided below the counterweight block 21. A top plate 5 is provided above the support plate 1. A pressure cylinder 51 is provided on the top plate 5. The cylinder rod of the pressure cylinder 51 extends downward through the top plate 5 to below the top plate 5. A pressure block 52 is provided at the end of the cylinder rod of the pressure cylinder 51.

[0028] The aforementioned annular support block and annular outer edge are integrally formed. The annular outer edge is located at the upward position of the outer edge of the annular support block, forming a fixation at the motor stop. The end face of the motor housing presses on the annular outer edge, which in turn presses on the support plate. The mass of the counterweight block must be more than 1.2 times the mass of the worm gear to ensure that the counterweight block can limit and block the worm gear with its own weight. The worm gear and the motor output shaft are thermally fitted. After the motor is placed on the support plate, the pressure cylinder controls the pressure block to keep pressing down and pressing the motor. When the drive cylinder starts, the cylinder rod of the drive cylinder drives the worm gear to press onto the motor output shaft. As the worm gear is driven upward, it will generate inertia and move excessively upward a certain axial distance. During this process, it will be blocked by the counterweight block and return to the original correct position range.

[0029] like Figure 1-3 As shown, the bottom of the annular support block 2 is provided with multiple guide rods 22 extending downward and passing through the counterweight block 21. The counterweight block 21 is provided with guide holes 212 for cooperating with the guide rods 22. The side wall of the guide rod 22 located below the counterweight block 21 is provided with an annular limiting part 221. The annular support block 2 is provided with multiple threaded holes 23. The end of the guide rod 22 connected to the annular support block 2 is provided with a threaded section 231 that mates with the threaded hole 23. The outer edge of the upper end of the annular support block 2 is provided with a support plate 1. An opening 25 is provided on the same side of the annular outer edge 24 on the top surface, the annular support block 2, the counterweight block 21, and the annular outer edge 24. The annular support block is located inside the through hole and abuts against the inside of the through hole. The guide rod is fixed to the bottom of the annular support block by a thread. By rotating the guide rod, the distance between the guide rod and the annular support block can be adjusted, thereby adjusting the movable range of the counterweight block. The counterweight block moves upward due to the worm gear and moves downward due to its own weight, automatically hanging on the annular limiting part at the bottom of the guide rod.

[0030] like Figure 1 and 4As shown, a base plate 4 is provided below the support plate 1. The drive cylinder 3 is located at the bottom of the base plate 4, with the cylinder rod of the drive cylinder 3 facing upwards. A connecting rod 32 is fixed to the upper end of the cylinder rod of the drive cylinder 3 via a connecting block 31. The connecting rod 32 passes upwards through the base plate 4 and is coaxial with the motor output shaft. The end of the connecting rod 32 is provided with a pin 320 that is coaxial with the connecting rod 32 and can move up and down. A fixed cavity 321 is provided inside the connecting rod 32, and a telescopic spring 322 is provided inside the fixed cavity 321. The pin 320 passes through the connecting rod 32 and extends into the fixed cavity 321, where it is connected to the telescopic spring 322. The upper end of pin 320 is connected to pin 2. The bottom end of pin 320 is provided with an annular protrusion 323 that abuts against the side wall of fixed cavity 321. After the worm is placed at the end of the connecting rod, the inner hole of the worm is fitted onto the pin, and the bottom end of the worm abuts against the top end of the connecting rod. The drive cylinder is started, and the connecting rod is controlled to drive the worm to move upward. The worm is pressed onto the motor output shaft. During this process, the pin is pushed by the motor output shaft and moves downward into the fixed cavity until the worm is assembled. The connecting rod returns to its original position, and the pin automatically rebounds under the action of the telescopic spring and is limited by the annular protrusion to prevent the pin from dislodging from the fixed cavity.

[0031] like Figure 1-4 As shown, the assembly method of the motor output shaft and worm gear assembly device includes the following steps:

[0032] S1. Assemble the motor onto the support plate, so that the motor shaft is pointing downwards;

[0033] S2. Assemble the worm gear to the end of the connecting rod and heat the worm gear;

[0034] S3. Start the pressure cylinder to drive the pressure block to press down on the motor;

[0035] S4. Start the drive cylinder to press the heated worm gear upward onto the motor output shaft;

[0036] S5. Control the connecting rod to return to its original position and release the clamping force on the motor.

[0037] The motor output shaft is pressed against the annular support block. The motor output shaft extends downward through the hole in the annular support block to the bottom of the support plate. The counterweight is located on the periphery of the motor output shaft. The axial height of the counterweight is greater than the axial height of the worm gear mounted on the motor output shaft. When the worm gear is heated to the end of the connecting rod, a high-frequency heat exchanger is used to heat the worm gear for 1.5 seconds. The output power percentage is 20%, and the worm gear surface temperature is 350°C. This ensures the best heating state of the worm gear. After the worm gear is heated, the inner hole of the worm gear will increase, resulting in a loose fit between the worm gear and the motor output shaft. When the worm gear is blocked by the counterweight and moves downward instantaneously, the worm gear cools down and is exactly within the specified position range. The axial position deviation range of the worm gear in the vertical direction is ±0.5mm.

Claims

1. An electric motor shaft and worm assembly apparatus, characterized by: The system includes a support plate (1), with a through hole (11) in the middle. An annular support block (2) for supporting the motor stop position is located inside the through hole (11). Below the annular support block (2), a counterweight block (21) is movably connected to and can move up and down. The counterweight block (21) has a through hole (211) in the middle for the motor output shaft to pass downwards through it. The inner diameter of the through hole (211) is smaller than the outer diameter of the worm gear. Below the counterweight block (21), a drive cylinder (3) is provided to press the worm gear onto the motor output shaft. The bottom of the annular support block (2) has multiple guide rods (22) extending downwards and passing through the counterweight block (21). The counterweight block (21) has guide holes (212) for engaging with the guide rods (22). An annular limiting part (221) is provided on the side wall of the upper end located below the counterweight (21); the annular support block (2) is provided with multiple threaded holes (23), and the end of the guide rod (22) connected to the annular support block (2) is provided with a threaded section (231) that mates with the threaded holes (23); a base plate (4) is provided below the support plate (1), and the driving cylinder (3) is located at the bottom of the base plate (4). The cylinder rod of the driving cylinder (3) is set upward, and the upper end of the cylinder rod of the driving cylinder (3) is fixed with a connecting rod (32) through a connecting block (31). The connecting rod (32) passes upward through the base plate (4) and is coaxial with the motor output shaft. The end of the connecting rod (32) is provided with a pin (320) that is coaxial with the connecting rod (32) and can move up and down.

2. The motor shaft and worm assembly apparatus of claim 1, wherein: The annular support block (2) has an annular outer edge portion (24) located on the top surface of the support plate (1) at the upper outer edge.

3. The motor shaft and worm assembly apparatus of claim 2, wherein: The annular support block (2), the counterweight block (21), and the annular outer edge (24) are provided with an opening (25) on the same side.

4. The motor shaft and worm assembly apparatus of claim 1, wherein: The connecting rod (32) has a fixed cavity (321) inside, and a telescopic spring (322) is provided inside the fixed cavity (321). The pin (320) passes through the connecting rod (32) and extends into the fixed cavity (321) and is connected to the upper end of the telescopic spring (322). The bottom end of the pin (320) has an annular protrusion (323) that abuts against the side wall of the fixed cavity (321).

5. The motor shaft and worm assembly apparatus of claim 1, wherein: A top plate (5) is provided above the support plate (1), and a pressure cylinder (51) is provided on the top plate (5). The cylinder rod of the pressure cylinder (51) extends downward through the top plate (5) to below the top plate (5), and a pressure block (52) is provided at the end of the cylinder rod of the pressure cylinder (51).

6. The assembling method of the motor shaft and worm assembly device according to any one of claims 1 to 5, characterized in that, Includes the following steps: S1. Assemble the motor onto the support plate, so that the motor shaft is pointing downwards; S2, assemble the worm to the end of the connecting rod and heat the worm; S3, start the pressure cylinder to drive the pressing block to press the motor downward; S4, start the driving cylinder to press the heated worm upward to the motor output shaft; S5, control the connecting rod to return to the original position and cancel the pressing of the motor.

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