Reduction gearbox capable of switching reduction ratio

Abstract

The utility model relates to the technical field of electric screwdrivers, in particular to a reduction gearbox capable of switching reduction ratios, which comprises a speed reduction component, a screwdriver head arranged on the speed reduction component and a motor component in driving connection with the speed reduction component. The speed reduction assembly comprises a cylinder, a gear shifting piece movably arranged on the cylinder and a first transmission assembly arranged on the cylinder, the screwdriver head is provided with an output head, the output head is connected with the first transmission assembly, one end of the gear shifting piece is connected with the output end of the motor assembly, and the other end of the gear shifting piece is connected with the output end of the motor assembly. The other end of the gear shifting piece moves back and forth between the output head and the first transmission assembly so that the gear shifting piece can be independently in transmission connection with the output head or the first transmission assembly. The screw assembling and disassembling device is compact in structure and reasonable in design, adopts a mechanical clutch structure to effectively adjust the speed, is simple, convenient and efficient to operate, and meets the assembling and disassembling requirements of different types of screws.

Description

Technical Field

[0001] This utility model relates to the field of electric screwdriver technology, and in particular to a gearbox with switchable reduction ratio. Background Technology

[0002] Electric screwdrivers, also known as power screwdrivers or electric screwdrivers, work by converting electrical energy into mechanical energy. When the user presses the switch, the internal motor rotates, transmitting torque to the screwdriver bit via gear transmission. The bit then drives the screw to rotate, enabling the rapid installation and removal of screws. This has led to their widespread use in industries such as aerospace, automotive, machinery, and electronics. However, during use, the torque of the electric screwdriver needs to be adjusted according to the specific situation when tightening different types of screws. Because existing electric screwdrivers lack torque adjustment functionality, excessive torque can cause excessively high rotation speeds, resulting in wear and damage to the screw structure and making it difficult to meet the needs of installing and removing various types of screws. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by providing a gearbox with switchable reduction ratios. It has a compact and reasonable structure, adopts a mechanical clutch structure to effectively adjust the speed, and is easy and efficient to operate, meeting the needs of loading and unloading different types of screws.

[0004] To achieve the above objectives, this utility model provides a gearbox with switchable reduction ratios, comprising a reduction assembly, a screwdriver head disposed on the reduction assembly, and a motor assembly drivenly connected to the reduction assembly. The reduction assembly includes a cylinder, a shifting component movably disposed on the cylinder, and a first transmission assembly disposed on the cylinder. The screwdriver head is provided with an output head, which is connected to the first transmission assembly. One end of the shifting component is connected to the output end of the motor assembly, and the other end of the shifting component moves back and forth between the output head and the first transmission assembly, so that the shifting component can be drivenly connected to either the output head or the first transmission assembly independently.

[0005] Preferably, the shifting component includes a shifting key, a rotating rod rotatably disposed on the shifting key, a first connector and a second connector disposed on the rotating rod, and a guide hole disposed on the shifting key. The shifting key is provided with a rotating hole for the rotating rod to be fitted and installed. The cylinder is provided with a guide rod. The shifting key is slidably connected to the guide rod through the guide hole. The first connector and the second connector are respectively sleeved on both ends of the rotating rod.

[0006] Preferably, the first transmission assembly includes a first planetary carrier, a first gear shaft disposed on the first planetary carrier, a first planetary gear disposed on the first gear shaft, and a gear transmission cylinder meshing with the first planetary gear. The gear transmission cylinder has an internally hollow structure. The rotating rod passes through the gear transmission cylinder through a first connector to connect to the output head. The cylinder body is provided with a first internal gear ring, which meshes with the first planetary gear. The cylinder body is provided with a bearing, which is sleeved on the outside of the gear transmission cylinder.

[0007] Preferably, the motor assembly includes a cavity, a main gear disposed in the cavity, a motor drivenly connected to the main gear, a second transmission assembly meshing with the main gear, a third transmission assembly drivingly connected to the second transmission assembly, and a second internal gear ring disposed in the cavity. The second internal gear ring is arranged around the circumference of the cavity, and both the second transmission assembly and the third transmission assembly mesh with the second internal gear ring.

[0008] Preferably, the second transmission assembly includes a second planetary carrier, a transmission gear disposed on one side of the second planetary carrier, a second gear shaft disposed on the other side of the second planetary carrier, and a second planetary gear disposed on the second gear shaft. The second gear shaft and the second planetary gear are each provided with three, and the connection between the three second gear shafts forms a triangle, and the connection between the three second planetary gears forms a triangle.

[0009] Preferably, the third transmission assembly includes a third planetary carrier, an output sleeve disposed on one side of the third planetary carrier, a third gear shaft disposed on the other side of the third planetary carrier, and a third planetary gear disposed on the third gear shaft. The third gear shaft and the third planetary gear are each provided in threes. The connection between the three third gear shafts forms a triangle, and the connection between the three third planetary gears forms a triangle, so that the three third planetary gears are arranged around the circumference of the transmission gear and are connected to the transmission gear for transmission. The output sleeve is connected to the second connector.

[0010] The advantages of this utility model are: compact structure and reasonable design, using a mechanical clutch structure to effectively adjust the speed, simple and efficient operation, and meeting the needs of loading and unloading different types of screws. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 This is an exploded structural diagram of the present invention.

[0013] Figure 3 This is a schematic diagram of the internal cross-sectional structure of this utility model.

[0014] Figure 4 This is a schematic diagram of the rotating rod structure of this utility model.

[0015] The reference numerals in the figures include:

[0016] 1—Reduction Gear Assembly 11—Cylinder Body

[0017] 12—Shift component; 121—Shift button; 122—Rotating lever

[0018] 123 — First connector; 124 — Second connector; 125 — Guide hole

[0019] 126 - Rotating hole; 127 - Guide rod

[0020] 13—First transmission assembly; 131—First planetary carrier; 132—First gear shaft

[0021] 133 – First planetary gear; 134 – Gear transmission cylinder

[0022] 14 – First internal gear ring; 15 – Bearing

[0023] 2 - Screwdriver bit 21 - Output head

[0024] 3—Motor assembly; 31—Cavity; 32—Main gear

[0025] 33 - Electric motor

[0026] 34—Second transmission assembly; 341—Second planetary carrier; 342—Transmission gear.

[0027] 343 – Second gear shaft; 344 – Second planetary gear

[0028] 35—Third transmission assembly; 351—Third planetary carrier; 352—Output sleeve

[0029] 353 – Third gear shaft; 354 ​​– Third planetary gear

[0030] 36 – Second internal gear ring. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings.

[0032] like Figures 1 to 4As shown, a gearbox with switchable reduction ratio according to this utility model includes a reduction assembly 1, a screwdriver head 2 disposed on the reduction assembly 1, and a motor assembly 3 drivenly connected to the reduction assembly 1. The reduction assembly 1 includes a cylinder 11, a shifting member 12 movably disposed on the cylinder 11, and a first transmission assembly 13 disposed on the cylinder 11. The screwdriver head 2 is provided with an output head 21, which is connected to the first transmission assembly 13. One end of the shifting member 12 is connected to the output end of the motor assembly 3, and the other end of the shifting member 12 moves back and forth between the output head 21 and the first transmission assembly 13, so that the shifting member 12 can be drivenly connected to the output head 21 or the first transmission assembly 13 independently.

[0033] Before use, one end of the shifting component 12 is connected to the output end of the motor assembly 3, and the other end of the shifting component 12 moves back and forth between the output head 21 and the first transmission assembly 13. When the shifting component 12 is pushed, so that the shifting component 12 is connected to the first transmission assembly 13 alone, the shifting component 12 and the first transmission assembly 13 are in a disengaged state, so that the motor assembly 3 drives the first transmission assembly 13 to rotate through the shifting component 12. Since the output head 21 is connected to the first transmission assembly 13, the first transmission assembly 13 drives the screwdriver head 2 to rotate together through the output head 21, which plays a role in reducing speed and increasing torque for the screwdriver head 2, with a reduction ratio of 143:1. When the shifting component 12 passes through the first transmission assembly 13 and is connected to the output head 21 alone, the output head 21 directly drives the screwdriver head 2 to rotate. The first transmission assembly 13 only transmits torque and does not play a role in reducing speed, with a reduction ratio of 40:1. Therefore, by using a mechanical clutch, the speed of the screwdriver head 2 can be better adjusted and changed, with a significant speed adjustment effect and good practicality. This utility model has a compact and reasonable structure, and adopts a mechanical clutch structure to effectively adjust the speed. It is simple and efficient to operate and meets the needs of loading and unloading different types of screws.

[0034] The shift component 12 in this embodiment includes a shift key 121, a rotating rod 122 rotatably disposed on the shift key 121, a first connector 123 and a second connector 124 disposed on the rotating rod 122, and a guide hole 125 disposed on the shift key 121. The shift key 121 is provided with a rotating hole 126 for the rotating rod 122 to be fitted and installed. The cylinder 11 is provided with a guide rod 127. The shift key 121 is slidably connected to the guide rod 127 through the guide hole 125. The first connector 123 and the second connector 124 are respectively sleeved on both ends of the rotating rod 122. Specifically, the rotating rod 122 passes through the rotating hole 126 and is rotatably connected to the rotating hole 126, so that the rotating rod 122 rotates relative to the shift key 121. When the shift key 121 pushes back and forth relative to the cylinder 11, the shift key 121 slides through the guide hole 125 and the guide rod 127, which better guides the rotating rod 122 to move smoothly back and forth between the output head 21 and the first transmission assembly 13 through the first connector 123, and the rotating rod 122 moves back and forth relative to the motor assembly 3 through the second connector 124.

[0035] The first transmission assembly 13 in this embodiment includes a first planetary carrier 131, a first gear shaft 132 disposed on the first planetary carrier 131, a first planetary gear 133 disposed on the first gear shaft 132, and a gear transmission cylinder 134 meshing with the first planetary gear 133. The gear transmission cylinder 134 has an internal hollow structure. The rotating rod 122 passes through the gear transmission cylinder 134 through the first connector 123 to connect to the output head 21. The cylinder body 11 is provided with a first internal gear ring 14, which meshes with the first planetary gear 133. The cylinder body 11 is provided with a bearing 15, which is sleeved on the outside of the gear transmission cylinder 134. Specifically, the gear transmission cylinder 134 has an internal hollow structure, which not only provides the conveying force but also facilitates speed switching. Preferably, three first planetary gears 133 are respectively provided on the first gear shaft 132 and the first planetary gears 133. The three first planetary gears 133 are arranged around the circumference of the gear transmission cylinder 134. When the rotating rod 122 is connected to the gear transmission cylinder 134 through the first connector 123, the gear transmission cylinder 134 synchronously drives the three first planetary gears 133 to rotate together. Since the three first planetary gears 133 are respectively provided on the three first gear shafts 132, they drive the first planetary carrier 131 to rotate as a whole. Since the output head 21 is connected to the first planetary carrier 131, it drives the output head 21 to rotate. When the rotating rod 122 passes through the gear transmission cylinder 134 through the first connector 123 to connect to the output head 21, it directly drives the output head 21 to rotate, resulting in high transmission efficiency.

[0036] The motor assembly 3 in this embodiment includes a cavity 31, a main gear 32 disposed in the cavity 31, a motor 33 drivenly connected to the main gear 32, a second transmission assembly 34 meshing with the main gear 32, a third transmission assembly 35 drivenly connected to the second transmission assembly 34, and a second internal gear ring 36 disposed in the cavity 31. The second internal gear ring 36 is arranged around the circumference of the cavity 31, and both the second transmission assembly 34 and the third transmission assembly 35 mesh with the second internal gear ring 36. Specifically, the motor 33 drives the main gear 32 to rotate, and the rotating main gear 32 drives the second transmission assembly 34 to rotate. Since the second transmission assembly 34 is drivenly connected to the third transmission assembly 35, and the second internal gear ring 36 is arranged around the circumference of the cavity 31, the second transmission assembly 34 and the third transmission assembly 35 jointly rotate along the second internal gear ring 36 in an internal meshing manner. Then, the third transmission assembly 35 drives the rotating rod 122 to rotate. The structure is compact and has a strong load-bearing capacity, achieving efficient power transmission.

[0037] The second transmission assembly 34 in this embodiment includes a second planetary carrier 341, a transmission gear 342 disposed on one side of the second planetary carrier 341, a second gear shaft 343 disposed on the other side of the second planetary carrier 341, and a second planetary gear 344 disposed on the second gear shaft 343. The second gear shaft 343 and the second planetary gear 344 are each provided with three. The connection of the three second gear shafts 343 forms a triangle, and the connection of the three second planetary gears 344 forms a triangle. Specifically, three second planetary gears 344 are arranged around the circumference of the main gear 32. When the main gear 32 rotates, it synchronously drives the three second planetary gears 344 to rotate together. Since the three second planetary gears 344 are respectively set on the three second gear shafts 343, they drive the second planetary carrier 341 to rotate as a whole. The second planetary carrier 341 drives the third transmission component 35 to rotate through the transmission gear 342. The traditional three-stage planetary structure is adjusted to a two-stage structure with a reduction ratio of 100, which improves the transmission efficiency by 15%. The thickness is reduced, the assembly space is reduced, the structural design is optimized, and the manufacturing cost of the parts is greatly reduced. At the same time, the transmission accuracy is increased. Moreover, the structural design of the three second gear shafts 343 can greatly reduce the frictional resistance generated by the three second planetary gears 344 during rotation, thereby improving the transmission efficiency and transmission smoothness.

[0038] The third transmission assembly 35 in this embodiment includes a third planetary carrier 351, an output sleeve 352 disposed on one side of the third planetary carrier 351, a third gear shaft 353 disposed on the other side of the third planetary carrier 351, and a third planetary gear 354 disposed on the third gear shaft 353. The third gear shaft 353 and the third planetary gear 354 are respectively provided in threes. The connection line of the three third gear shafts 353 forms a triangle, and the connection line of the three third planetary gears 354 forms a triangle, so that the three third planetary gears 354 are arranged around the circumference of the transmission gear 342 and are connected to the transmission gear 342 for transmission. The output sleeve 352 is connected to the second connector 124. Specifically, three third planetary gears 354 are arranged around the circumference of the transmission gear 342 and are connected to the transmission gear 342 for transmission. When the transmission gear 342 rotates, it synchronously drives the three third planetary gears 354 to rotate together. Since the three third planetary gears 354 are respectively set on the three third gear shafts 353, they drive the third planetary carrier 351 to rotate as a whole, which helps the third planetary carrier 351 to drive the rotating rod 122 to rotate through the output sleeve 352, resulting in high transmission efficiency.

[0039] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A reduction gearbox having a switchable reduction ratio, characterised in that: The application relates to a screwdriver head, which comprises a reduction assembly, a screwdriver head arranged on the reduction assembly and a motor assembly drivingly connected with the reduction assembly, wherein the reduction assembly comprises a cylinder, a shifting piece movably arranged on the cylinder and a first transmission assembly arranged on the cylinder; the screwdriver head is provided with an output head, the output head is connected with the first transmission assembly, one end of the shifting piece is connected with the output end of the motor assembly, and the other end of the shifting piece moves back and forth between the output head and the first transmission assembly, so that the shifting piece is drivingly connected with the output head or the first transmission assembly.

2. A reduction gearbox of switchable reduction ratio according to claim 1, characterised in that: The shifting piece comprises a shifting key, a rotating rod rotatably arranged on the shifting key, a first connecting head and a second connecting head arranged on the rotating rod and a guide hole arranged on the shifting key; the shifting key is provided with a rotating hole for fittingly mounting the rotating rod; the cylinder is provided with a guide rod; the shifting key is slidingly connected with the guide rod through the guide hole; and the first connecting head and the second connecting head are respectively sleeved on two ends of the rotating rod.

3. A reduction gearbox of the kind specified in claim 2, characterised in that: The first transmission assembly comprises a first planet carrier, a first gear shaft arranged on the first planet carrier, a first planet gear arranged on the first gear shaft and a gear transmission cylinder meshing with the first planet gear; the gear transmission cylinder is internally hollow; the rotating rod penetrates through the gear transmission cylinder through the first connecting head to connect the output head; the cylinder is provided with a first inner ring gear; the first inner ring gear is meshed with the first planet gear; and the cylinder is provided with a bearing, which is sleeved on the outside of the gear transmission cylinder.

4. A reduction gearbox of switchable reduction ratio according to claim 2, characterised in that: The motor assembly comprises a cavity, a main gear arranged on the cavity, a motor drivingly connected with the main gear, a second transmission assembly meshing with the main gear, a third transmission assembly drivingly connected with the second transmission assembly and a second inner ring gear arranged on the cavity; the second inner ring gear is arranged around the periphery of the cavity; and the second transmission assembly and the third transmission assembly are both meshed with the second inner ring gear.

5. A reduction gearbox of the kind specified in claim 4, characterised in that: The second transmission assembly comprises a second planet carrier, a transmission gear arranged on one side of the second planet carrier, a second gear shaft arranged on the other side of the second planet carrier and a second planet gear arranged on the second gear shaft; the second gear shaft and the second planet gear are respectively provided with three; the connecting lines of the three second gear shafts form a triangle; and the connecting lines of the three second planet gears form a triangle.

6. A reduction gearbox of the kind specified in claim 5, characterised in that: The third transmission assembly comprises a third planet carrier, an output sleeve arranged on one side of the third planet carrier, a third gear shaft arranged on the other side of the third planet carrier and a third planet gear arranged on the third gear shaft; the third gear shaft and the third planet gear are respectively provided with three; the connecting lines of the three third gear shafts form a triangle; the connecting lines of the three third planet gears form a triangle; the three third planet gears are arranged around the periphery of the transmission gear and are drivingly connected with the transmission gear; and the output sleeve is connected with the second connecting head.

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