Electric glue gun and rack driving device

Abstract

The present application provides a kind of electric glue gun, electric glue gun includes a gun body, in the gun body is equipped with the motor controlled by a button switch, the motor is connected a speed reduction mechanism, its end has an output shaft, the output shaft is equipped with a drive gear around and is equipped with a sun gear at outer end, the drive gear side has a planet carrier combined with multiple planetary gears, the inside and outside of each planetary gear is engaged with the sun gear and a clutch gear ring that can be switched between position fixed and free rotation two states, a rack is arranged on the gun body and engaged with the drive gear;By switching the state of clutch gear ring, the drive gear can be released after advancing the rack and then pulled back to reset, since the drive gear, the clutch gear ring and the speed reduction mechanism are coaxial, the volume of drive device can be greatly reduced, and the electric glue gun is miniaturized.

Description

Technical Field

[0001] This invention relates to a power tool; more particularly to an electric glue gun and a rack and pinion drive device. Background Technology

[0002] Existing electric glue guns use an internal electric rack and pinion drive to propel a rack forward. A glue cartridge holder is connected to the front of the gun, and a glue cartridge is mounted on the holder. When the rack and pinion drive propels the rack forward, it pushes a piston inside the glue cartridge, pushing the glue liquid out of the cartridge for use.

[0003] In order to release the rack from its extreme position and pull it back to its original position to push the piston back into the glue cylinder, the aforementioned electric glue gun has a clutch mechanism on the drive gear that directly drives the rack in the rack drive device. However, since the existing rack drive device has a motor, planetary reduction gear set and drive gear with clutch mechanism located at three different axial positions, the rack drive device is relatively large, making it impossible to miniaturize the electric glue gun body. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an electric glue gun in which the deceleration mechanism and the drive component that directly drives the rack are coaxial, thereby reducing the volume occupied by the drive component and its clutch structure, and achieving the effect of miniaturizing the electric glue gun.

[0005] To achieve the above objectives, the present invention provides an electric glue gun, comprising a housing, a glue cartridge holder, a control device, a rack and pinion drive device, and a rack.

[0006] The outer casing includes a gun body and a grip connected to the bottom of the gun body; a rubber sleeve bracket connected to the front end of the gun body. A push-button switch is provided on the front side of the grip as a control device. A rack and pinion drive mechanism is located inside the gun body and has a motor controlled by the push-button switch. The motor is connected to a laterally arranged reduction mechanism. The reduction mechanism has an output shaft at its end, and a sun gear at its outer end. A drive assembly is rotatably fitted around the output shaft. The drive assembly includes a drive gear and a planetary carrier concentrically coupled to the side of the drive gear. Multiple rotatable planetary gears are coupled to the planetary carrier. The sun gear meshes with the inner side of each planetary gear, and a clutch ring meshes with the outer side of each planetary gear. The clutch ring can switch between a fixed first state and a freely rotatable second state. The rack can move forward and backward through the gun body, meshing with the drive gear of the drive assembly, and the front end of the rack passes forward through the gun body into the rubber sleeve bracket.

[0007] To achieve the above objectives, the present invention provides a rack and pinion drive device, comprising a gearbox, a motor, a reduction mechanism, a drive assembly, and a clutch ring.

[0008] The gearbox has a middle housing and a front plate and a motor mount connected to the front and rear sides of the middle housing, respectively. The middle housing has an installation space, through which a rack hole extending linearly in the front-rear direction passes, with a portion of the rack hole extending through the top side of the installation space. The motor is coupled to the motor mount. A reduction mechanism is laterally disposed in the installation space and connected to the motor. The end of the reduction mechanism has an output shaft, and the outer end of the output shaft has a sun gear. A drive assembly is rotatably mounted on the output shaft. The drive assembly has a drive gear and a planetary carrier concentrically coupled to the side of the drive gear. Multiple rotatable planetary gears are coupled to the planetary carrier. The sun gear meshes with the inner side of each planetary gear, and the top side of the drive gear extends into the rack hole. A clutch ring is disposed in the installation space and meshes with the outer side of each planetary gear. The clutch ring can switch between a fixed first state and a freely rotatable second state.

[0009] In use, this invention involves switching the clutch ring to a fixed first state and a freely rotatable second state. When the clutch ring is in the first state, the motor drives each planetary gear of the drive assembly to rotate around the clutch ring via the sun gear at the end of the reduction mechanism, thereby rotating the drive assembly and using its drive gears to propel the rack forward. When the clutch ring is switched to the second state, it is released, allowing free rotation. In this state, each planetary gear of the drive assembly can freely drive the clutch ring to rotate, ensuring unimpeded rotation of the drive assembly. The user can then pull the rack backward to its initial position.

[0010] The advantage of this invention is that by having a sun gear on the output shaft of the reduction mechanism meshing with each planetary gear set of the drive assembly, the reduction mechanism and the drive assembly can be made coaxial, thereby reducing the volume occupied by the rack and pinion drive device and miniaturizing the size of the electric glue gun. Attached Figure Description

[0011] Figure 1 This is a perspective view of a preferred embodiment of the present invention.

[0012] Figure 2 This is a perspective view of the disassembled half of the outer casing according to the preferred embodiment of the present invention.

[0013] Figure 3 for Figure 1 A cross-sectional view along the 3-3 direction.

[0014] Figure 4This is an exploded view of the rack and pinion drive device according to the preferred embodiment of the present invention.

[0015] Figure 5 This is another exploded view of the rack and pinion drive device according to the preferred embodiment of the present invention.

[0016] Figure 6A This is a perspective view of the rack and pinion drive device according to the preferred embodiment of the present invention.

[0017] Figure 6B for Figure 6A A cross-sectional view along the 6A-6A direction.

[0018] Figure 7 for Figure 1 A cross-sectional view along the 7-7 direction.

[0019] Figure 8 for Figure 7 A cross-sectional view after the lever is activated.

[0020] Figure 9 This is a schematic diagram of the rack advancing to its limit position according to the preferred embodiment of the present invention.

[0021] [Explanation of Labels in the Attached Images]

[0022] 100: Electric glue gun

[0023] 10: Outer shell

[0024] 12: Gun body

[0025] 121: Front hole

[0026] 122: Rear hole

[0027] 123: Lever hole

[0028] 124: Side opening

[0029] 14: Handle

[0030] 141: Button port

[0031] 16: Battery Box

[0032] 18: Lever

[0033] 181: Toggle element

[0034] 20: Glue Sleeve Support

[0035] 22: Place the rubber tube into the inlet.

[0036] 24: Stand base

[0037] 241: Base screw hole

[0038] 30: Control device

[0039] 31: Micro switch

[0040] 311: Press button

[0041] 32: Push-button switch

[0042] 321: Start switch

[0043] 322: Button

[0044] 34: Control circuit board

[0045] 36: Battery

[0046] 38: Adjust speed knob

[0047] 40: Rack and pinion drive unit

[0048] 41: Clutch ring

[0049] 411: Keyway

[0050] 42: Gearbox

[0051] 421: Middle Shell

[0052] 4211: Installation space

[0053] 4212: Rotary groove

[0054] 4213: Rack hole

[0055] 4214: Top Seat

[0056] 4215: Through the pole

[0057] 4216: Spring

[0058] 422: Front Board

[0059] 4221: Threaded pipe

[0060] 423: Motor mount

[0061] 424: Side Cover

[0062] 425: Track

[0063] 4251: Groove

[0064] 4252: Tank body

[0065] 426: Rotary groove cover

[0066] 4261: Convex shell portion

[0067] 427: Key Block

[0068] 4271: Pressing part

[0069] 428: Spring

[0070] 429: Cover

[0071] 4291: Reliance Department

[0072] 4292: Trigger lever

[0073] 44: Motor

[0074] 441: Output shaft

[0075] 442: Reduction Planetary Gear Set

[0076] 4421: Deceleration Planetary Carrier

[0077] 4422: Teeth

[0078] 46: Speed ​​reduction mechanism

[0079] 461: Output shaft

[0080] 462: Sun Gear

[0081] 463: Planetary Gear Set

[0082] 464: Input gear

[0083] 4641: Input sun gear

[0084] 48: Driver Components

[0085] 481: Drive gear

[0086] 482: Planetary Carrier

[0087] 483: Planetary Gear

[0088] 50: rack and pinion

[0089] 52: Pull handle Detailed Implementation

[0090] To more clearly illustrate the present invention, preferred embodiments are described in detail below with reference to the accompanying drawings. Please refer to... Figures 1 to 6B An electric glue gun 100 according to a preferred embodiment of the present invention includes a housing 10, a glue cartridge bracket 20, and a control device 30, a rack and pinion drive device 40 and a rack 50 respectively installed in the housing 10.

[0091] The outer casing 10 is a casing that is joined together from left to right and has a gun body 12. The bottom of the gun body 12 has a downwardly extending handle 14. A front hole 121 and a rear hole 122 are respectively inserted on the front and rear sides of the gun body 12. The front side of the top of the handle 14 has a button opening 141.

[0092] The rubber tube support 20 is a straight tube extending in the front-rear direction. The rear end of the rubber tube support 20 is connected to the front end of the gun body 12. The upper half of the rubber tube support 20 has a rubber tube inlet 22.

[0093] The control device 30 has a push-button switch 32, which includes a start switch 321 and a button 322 connected to the front of the start switch 321. The start switch 321 is located at the top inside the handle 14, and a portion of the button 322 extends forward through the button opening 141.

[0094] The rack and pinion drive device 40 is located inside the gun body 12. The rack and pinion drive device 40 has a motor 44, which is electrically connected to the start switch 321 and is activated by the push-button switch 32. The motor 44 has an output shaft 441, which is connected to a laterally arranged reduction mechanism 46. The end of the reduction mechanism 46 has an output shaft 461, and the outer end of the output shaft 461 has a sun gear 462. A drive assembly 48 is rotatably fitted around the output shaft 461. The drive assembly 48 includes... The device includes a drive gear 481 and a planet carrier 482. The drive gear 481 is rotatably mounted on the output shaft 461. The planet carrier 482 is concentrically coupled to the side of the drive gear 481. Multiple rotatable planetary gears 483 are coupled to the planet carrier 482. The sun gear 462 meshes with the inner side of each planetary gear 483. A clutch ring 41 meshes with the outer side of each planetary gear 483. The clutch ring 41 can switch between a first state in which the position is fixed relative to the housing 10 and a second state in which it can rotate freely.

[0095] The rack 50 is a rack that extends in a straight line and is inserted into the gun body 12 in a way that allows it to move forward and backward. The rack 50 meshes with the drive gear 481 of the drive assembly 48. The front end of the rack 50 passes forward into the rubber sleeve bracket 20 through the front hole 121 of the gun body 12, and the rear end of the rack 50 passes backward through the rear hole 122 of the gun body 12.

[0096] When the preferred embodiment of the present invention is used, the glue tube is placed into the glue tube support 20 through the glue tube inlet 22 and positioned. Then, the button switch 32 is pressed to start the motor 44. At this time, the clutch gear ring 41 is set to the first state. The motor 44 drives each planetary gear 483 to rotate around the clutch gear ring 41 through the sun gear 462 at the end of the reduction mechanism 46. This allows the drive gear 481 of the rotating drive assembly 48 to drive the rack 50 forward, squeezing the glue tube in the glue tube support 20 and outputting glue.

[0097] When it is necessary to replace the glue cartridge on the glue cartridge holder 20, the clutch ring 41 is switched to a freely rotatable second state. At this time, the user can pull the rack 50 backward. During this process, the rack 50 drives the drive assembly 48 to rotate, allowing each planetary gear 483 to rotate freely by rotating the clutch ring 41, thus enabling the drive assembly 48 to rotate without obstruction. This allows the rack 50 to move freely forward and backward. Pulling the rack 50 backward until it is disengaged from the glue cartridge holder 20 allows the glue cartridge holder 20 to be reloaded with a new glue cartridge. This invention benefits from the coaxial design of the reduction mechanism 46 and the drive assembly 48 in the rack drive device 40, which reduces the volume occupied by the rack drive device 40 and miniaturizes the electric glue gun 100.

[0098] The following further describes the detailed structure of the preferred embodiment described above. Please refer to the attached diagram. Figures 1 to 6B The gun body 12 has a horizontal through-hole 123 above the button port 141, and a side opening 124 is provided on the left side of the rear end of the gun body 12. A battery box 16 is detachably attached to the bottom end of the grip 14.

[0099] The rack and pinion drive device 40 is provided with a gearbox 42, which has a middle shell 421, a front plate 422 and a motor base 423. The front plate 422 and the motor base 423 are respectively connected to the front and rear sides of the middle shell 421. The gearbox 42 is fixed inside the gun body 12. The front plate 422 is embedded in the front hole 121 and fixed. The center of the front plate 422 has a forward-protruding threaded tube 4221. The rear end of the rubber sleeve bracket 20 has a bracket base 24. The center of the bracket base 24 has a base screw hole 241. The base screw hole 241 is screwed into the threaded tube 4221, so that the rubber sleeve bracket 20 is fixed to the front side of the front plate 422 and connected to the front end of the gun body 12. The middle shell 421 has an installation space 4211. A rotating groove 4212 is formed on the right side of the middle shell 421. The interior of the rotating groove 4212 communicates with the installation space 4211. A rack hole 4213 extending in a straight line in the front-rear direction passes through the middle shell 421 and the front plate 422. The front end of the rack hole 4213 passes through the threaded tube 4221. A portion of the rack hole 4213 passes through the top side of the installation space 4211. A cover 424 is placed on the left side of the middle shell 421 and the motor mount 423.

[0100] A laterally extending track 425 is provided on the bottom side around the rotating groove 4212. The right side of the track 425 protrudes from the rotating groove 4212. The track 425 has a slot 4251. The inner left side of the slot 4251 communicates with the rotating groove 4212. A groove body 4252 is formed inside the track 425. The groove body 4252 extends laterally through the track 425. A rotating groove cover 426 is attached to the outer right side of the rotating groove 4212. A convex shell portion 4261 protruding to the right is formed on the bottom side of the rotating groove cover 426. The rotating groove cover 426 covers the part of the track 425 that protrudes from the rotating groove 4212 and closes the right end of the groove body 4252.

[0101] The reduction mechanism 46 includes one or more sets of planetary gear sets 463 connected in sequence. For example, in this preferred embodiment, two sets of planetary gear sets 463 are connected in sequence. The reduction mechanism 46 is disposed in the mounting space 4211. An input gear 464 is provided at the front end of the reduction mechanism 46. The input gear 464 is located inside the side cover 424 and is concentrically coupled to an input sun gear 4641 on the inner side. The input sun gear 4641 is connected to the center of the first set of planetary gear sets 463, and the top side of the drive gear 481 extends into the rack hole 4213. The motor 44 is attached to the motor housing 423 and connected to a reduction planetary gear set 442 via the output shaft 441. The reduction planetary gear set 442 is located inside the side cover 424 and has a reduction planet carrier 4421. A tooth 4422 is formed around the outer peripheral surface of the reduction planet carrier 4421. The tooth 4422 meshes with the input sun gear 4641, thereby connecting the motor 44 to the reduction mechanism 46.

[0102] Please refer to Figure 5 and Figure 7 The clutch gear ring 41 is rotatably disposed within the rotating groove 4212. At least one keyway 411 is provided on the outer peripheral surface of the clutch gear ring 41. In this preferred embodiment, multiple keyways 411 are provided on the outer peripheral surface of the clutch gear ring 41 in a circumferential and equally spaced manner. A key block 427 is provided on the track 425. In this preferred embodiment, the key block 427 is in a first position when it is located on the left side of the track 425 and in a second position when it is located on the right side of the track 425. The key block 427 can move laterally between the first position and the second position.

[0103] The top of the key block 427 protrudes upward from the slot 4251. The convex shell 4261 can be used to accommodate the top of the key block 427 protruding from the slot 4251. The bottom of the key block 427 protrudes a pressing part 4271 towards the inner end of the groove body 4252. A spring 428 is provided in the groove body 4252. The two ends of the spring 428 are compressed and abut against the inner surfaces of the key block 427 and the convex shell 4261 respectively, so that the key block 427 is normally held in the first position on the left side of the track 425. At this time, the key block 427 protrudes from the top of the slot 4251 and is embedded in one of the key slots 411 of the clutch tooth ring 41, so that the key slot 411 is in a first state of being fixed and not rotating relative to the outer shell 10.

[0104] Please refer to Figures 2 to 7 The rack 50 passes through the rack hole 4213 of the gearbox 42 and meshes with the top side of the drive gear 481. A handle 52 is attached to the rear end of the rack 50 extending from the rear hole 122. The width of the rear hole 122 is sufficient to accommodate the front end of the handle 52. The control device 30 has a control circuit board 34 on the bottom side inside the gun body 12. The push-button switch 32 and the motor 44 are electrically connected to the control circuit board 34. A battery 36 is installed in the battery box 16. The battery 36 is electrically connected to the control circuit board 34 and supplies the power required for the operation of the electric glue gun 100. A speed adjustment knob 38 is attached to the control circuit board 34. The left side of the speed adjustment knob 38 extends out of the side opening 124 of the gun body 12. The user can control the rotation speed of the motor 44 and the speed at which the rack drive device 40 propels the rack 50 forward by rotating the speed adjustment knob 38.

[0105] The inner shell 421 has a top seat 4214. A through rod 4215 extends rearward from the top seat 4214. A cover 429 is fitted onto the rear side of the through rod 4215. A spring 4216 is fitted onto the through rod 4215, and part of the spring 4216 is accommodated within the cover 429. A stop portion 4291 extends rearward from the cover 429. The stop portion 4291 protrudes rearward from the rear end of the rack hole 4213 and is located directly in front of the front edge of the pull handle 52. A trigger rod 4292 extends forward from one side of the cover 429. A micro switch 31 is provided on the front side of the top seat 4214. The micro switch 31 is electrically connected to the control circuit board 34 and has a button 311. Please refer to [reference needed]. Figure 3 and Figure 9 When the front end of the pull handle 52 moves forward with the rack 50 and enters the rear hole 122, it will push the cover 429 forward. When the trigger rod 4292 moves forward with the cover 429, it will press the button 311, triggering the micro switch 31 to force the control circuit board 34 to stop the motor 44 from driving the rack 50 forward.

[0106] Please refer to Figure 5 and Figure 7 A lever 18 is inserted through the lever hole 123. The lever 18 is a horizontally arranged long rod with an actuating element 181 extending upward from its part inside the gun body 12. The hook-shaped free end of the actuating element 181 extends horizontally to the right into the inner end of the left side of the groove 4252. When the user moves the lever 18 horizontally, the actuating element 181 can press the pressing part 4271 of the key block 427, moving the key block 427 to the second position and disengaging it from the key groove 411 around the clutch tooth ring 41. This releases the clutch tooth ring 41, allowing it to rotate freely within the rotating groove 4212. At this time, the user can hold the pull handle 52 and pull the rack 50 backward. During this process, the rack 50 drives the drive assembly 48 to rotate the clutch tooth ring 41 freely.

[0107] When the rack 50 is pulled back to the starting position behind the rubber sleeve bracket 20, the lever 18 is returned to its original position. At this time, the spring 428 pushes the key block 427 back with elastic restoring force, so that the key block 427 is back in the first position on the left side of the track 425. At this time, the top of the key block 427 is once again inserted into one of the key slots 411 of the clutch gear ring 41, so that the key slot 411 is in the first state of being fixed and not rotating relative to the outer shell 10. At this time, the output of the motor 44 can once again drive the reduction mechanism 46 to push the rack 50 forward, so that the rack 50 pushes the rubber sleeve located in the rubber sleeve bracket 20.

[0108] The above description is only a preferred embodiment of the present invention. Any equivalent changes made by applying the present invention specification and the claims should be included within the patent scope of the present invention.

Claims

1. An electric glue gun, characterized in that, include: An outer casing, comprising a gun body and a grip attached to the bottom of the gun body; A rubber sleeve bracket is attached to the front end of the gun body; A control device, wherein a push-button switch is provided on the front side of the handle; A rack and pinion drive device is located inside the gun body and has a motor that is started by the button switch. The motor is connected to a horizontally arranged reduction mechanism. The end of the reduction mechanism has an output shaft. The outer end of the output shaft has a sun gear. A drive assembly is rotatably fitted around the output shaft. The drive assembly includes a drive gear and a planetary carrier concentrically coupled to the side of the drive gear. The drive gear is rotatably fitted to the output shaft. Multiple self-rotating planetary gears are coupled to the planetary carrier. The sun gear meshes with the inner side of each planetary gear. A clutch ring meshes with the outer side of each planetary gear. The clutch ring can switch between a fixed first state and a freely rotatable second state. as well as A rack is inserted into the gun body in a forward and backward direction. The rack meshes with the drive gear of the drive assembly, and the front end of the rack passes forward from the gun body into the rubber sleeve bracket.

2. The electric glue gun according to claim 1, characterized in that, At least one keyway is provided on the outer peripheral surface of the clutch gear ring; a circular rotating groove is formed inside the housing, and the clutch gear ring is rotatably disposed in the rotating groove. A laterally extending track is provided on one side of the rotating groove, and the track has a slot, which at least partially communicates with the rotating groove. A key block is provided on the track, and a portion of the key block protrudes from the slot. The key block can move laterally between a first position and a second position. When the key block is in the first position, the portion protruding from the slot is embedded in the keyway of the clutch gear ring, so that the clutch gear ring is in the first state.

3. The electric glue gun according to claim 2, characterized in that, The gun body has a front hole at the front end and a rear hole at the rear. The rack and pinion drive device has a gearbox with a middle shell and a front plate and a motor mount connected to the front and rear sides of the middle shell respectively. The front plate is embedded in the front hole. The middle shell has an installation space. The rotating groove is formed on one side of the middle shell and communicates with the installation space. A rack hole extending in a straight line in the front-rear direction passes through the middle shell and the front plate. A portion of the rack hole passes through the top side of the installation space. The top side of the drive gear extends into the rack hole. The rack passes through the rack hole and meshes with the top side of the drive gear. The rear end of the rack extends out through the rear hole. The motor is connected to the motor mount, and the reduction mechanism is located in the installation space.

4. The electric glue gun according to claim 3, characterized in that, A lever hole is transversely penetrating the gun body; a rotating groove cover is attached to the outside of the rotating groove, and a convex shell is formed on one side around the rotating groove cover. A groove body is formed transversely penetrating the track. The convex shell closes the outer end of the groove body and can be used to accommodate the part of the key block protruding from the groove opening. A spring is provided in the groove body, and the two ends of the spring are compressed and abut against the key block and the convex shell respectively. The key block protrudes a pressing part towards the inner end of the groove body. A lever is inserted through the lever hole, and a toggle member extends from the part of the lever located inside the gun body. The free end of the toggle member extends transversely into the inner end of the groove body. When the lever is toggled transversely, the toggle member can press the pressing part of the key block, move the key block to the second position and disengage it from the key groove, and release the clutch gear ring so that the clutch gear ring is in the second state.

5. The electric glue gun according to claim 3 or 4, characterized in that, A handle is attached to the rear end of the rack; a top seat is provided on the middle shell, a through rod extends rearward from the top seat, a cover is fitted on the through rod, a spring is fitted on the through rod, part of the spring is accommodated in the cover, a stop portion extends rearward from the cover, the stop portion protrudes rearward from the rear end of the rack hole and is located directly in front of the front edge of the handle, a trigger rod extends forward from one side of the cover, a micro switch is provided next to the top seat, the micro switch has a button, when the trigger rod moves forward with the cover, it will press the button, triggering the micro switch to force the motor to stop running.

6. The electric glue gun according to any one of claims 1 to 4, characterized in that, The gun body has an opening on one side, and a control circuit board is installed inside the housing. The push-button switch and the motor are electrically connected to the control circuit board. A speed adjustment knob is attached to the control circuit board, and part of the speed adjustment knob extends out of the opening. The speed adjustment knob is used to control the speed of the motor.

7. The electric glue gun according to any one of claims 1 to 4, characterized in that, The reduction mechanism includes one or more sets of planetary gears connected in sequence.

8. A rack and pinion drive device, characterized in that, include: A gearbox has a middle housing and a front plate and a motor mount respectively connected to the front and rear sides of the middle housing. The middle housing has an installation space. A rack hole extending in a straight line in the front and rear direction passes through the middle housing and the front plate. A portion of the rack hole passes through the top side of the installation space. A motor, which is attached to the motor mount; A reduction mechanism is laterally disposed in the installation space and connected to the motor. The end of the reduction mechanism has an output shaft, and the outer end of the output shaft has a sun gear. A drive assembly rotatably mounted on the output shaft, the drive assembly having a drive gear and a planetary carrier concentrically coupled to the side of the drive gear, the drive gear rotatably mounted on the output shaft, and a plurality of rotatable planetary gears coupled to the planetary carrier, the sun gear meshing with the inner side of each planetary gear, and the top side of the drive gear extending into the rack hole; and A clutch gear ring is disposed in the mounting space and meshes with the outside of each planetary gear. The clutch gear ring is capable of switching between a first state in which the position is fixed and a second state in which it can rotate freely.

9. The rack and pinion drive device according to claim 8, characterized in that, At least one keyway is provided on the outer peripheral surface of the clutch gear ring; a circular rotating groove is formed on one side of the middle shell and its interior communicates with the installation space. The clutch gear ring is rotatably disposed in the rotating groove. A laterally extending track is provided on one side of the rotating groove. The track has a slot, which at least partially communicates with the rotating groove. A key block is provided on the track, and a portion of the key block protrudes from the slot. The key block can move laterally between a first position and a second position. When the key block is in the first position, the portion protruding from the slot is embedded in the keyway of the clutch gear ring, so that the clutch gear ring is in the first state.

10. The rack and pinion drive device according to claim 9, characterized in that, A rotating groove cover is attached to the outside of the rotating groove. A convex shell is formed on one side of the rotating groove cover. A groove body is formed inside the track, which runs horizontally through the track. The convex shell closes the outer end of the groove body and can be used to accommodate the part of the key block that protrudes from the groove opening. A spring is provided in the groove body. The two ends of the spring are compressed and abut against the key block and the convex shell respectively. A pressing part protrudes from the key block toward the inner end of the groove body. The pressing part of the key block is used for a toggle member to press.

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