Electric drill deceleration structure and electric drill

Abstract

An electric drill reduction structure and an electric drill. The present invention relates to an electric drill reduction structure and an electric drill, and provides an electric drill reduction structure, wherein the electric drill reduction structure comprises a wheel-type continuously variable transmission and a cycloidal pinwheel reducer. The present invention also provides an electric drill, which has the above-mentioned electric drill reduction structure. The electric drill reduction structure comprises a wheel-type continuously variable transmission and a cycloidal pinwheel reducer, and has the characteristics of a wide speed regulation range, stepless speed regulation, balanced operation, low noise, etc., and overcomes the problems of gear box grease easily flowing out of the shift hole and gear shift jamming in traditional structures. The electric drill equipped with the electric drill reduction structure is far superior to traditional gear box hand drills in terms of speed, torque and impact rate in screwdriver mode. Because stepless speed regulation can be achieved, no matter how much power is required, the user can always adjust the speed ratio of the reduction to make the power motor always operate under the maximum power or highest energy efficiency condition.

Description

Technical Field

[0001] The invention relates to an electric drill deceleration structure and an electric drill. Background Art

[0002] Currently, the mainstream screwdriver and electric drill speed reducer uses three sets of NGW planetary gear mechanisms to achieve its speed reduction, gear shifting and torque adjustment functions. This structure has several disadvantages as follows:

[0003] 1. Traditional gearboxes typically have only two gears, which are sparsely spaced and have a narrow speed ratio range. This sparse range means the motor often cannot operate at full capacity. For example, when a drill with a 0-600 RPM / 0-2100 RPM speed is operated at 700 RPM, the motor can only operate at 33% of its maximum speed. This narrow speed ratio range means the drill cannot rotate very fast in high gear and cannot produce sufficient torque in low gear.

[0004] 2. Traditional gearboxes shift gears by moving the inner ring gear of the second-stage planetary gear mechanism back and forth using a shift fork. This requires holes in the gearbox housing for the shift forks. Grease can leak through these holes and contaminate the drill's interior. Furthermore, as the grease in the gearbox decreases, the planetary gear mechanism wears faster.

[0005] 3. During the gear shifting process of a traditional gearbox, there is a chance that the tooth tip of the inner gear ring will be blocked by the tooth tip of the gear meshing with it, making it impossible to shift gears. Summary of the Invention

[0006] In order to solve the above-mentioned problems, the present invention provides an electric drill speed reduction structure and an electric drill.

[0007] To achieve the above-mentioned object, on the one hand, the present invention provides an electric drill reduction structure, comprising a power motor, a wheel-type continuously variable transmission configured at the output end of the power motor, and a cycloid pinwheel reducer configured at the output end of the wheel-type continuously variable transmission;

[0008] The wheel-type continuously variable transmission includes a transmission case, wherein an active ring disc, a wheel rudder, a driven ring disc, and a plane bearing are sequentially arranged in the transmission case along the power transmission direction. The wheel rudder is rotatably inserted into the transmission case and forms a mutually meshing structure through a tooth plate at the exit end. A freely rotating roller is provided in the middle of the wheel rudder. The power of the power motor is output to the driven ring disc via the active ring disc and the roller. A knob shift device for adjusting the meshing state of the tooth plate is provided outside the transmission case.

[0009] The cycloid pinwheel reducer includes an input shaft that rotates synchronously with the driven ring disk, two eccentric bearings arranged on the input shaft, two cycloid disks connected to the input shaft via the two eccentric bearings, a ring gear arranged outside the two cycloid disks and an output shaft. The input shaft transmits power to the output shaft via the eccentric motion of the two cycloid disks.

[0010] Furthermore, the power motor is connected to the active ring disk by a motor shaft, and a compression spring is arranged on the motor shaft. The compression spring keeps the active ring disk and the roller in close contact through elastic force.

[0011] Furthermore, the contact surfaces of the roller, the active ring disc, and the driven ring disc are spherical surfaces that match each other.

[0012] Furthermore, there are two wheel rudders, and the knob shift device includes a knob, a gear spring sheet, a torsion spring, and a synchronizer ring. The synchronizer ring is fixedly connected to the end of one of the wheel rudders, and the knob is rotatably mounted on the outside of the synchronizer ring. A first sector-shaped groove is formed on the synchronizer ring, and a matching second sector-shaped groove is formed on the knob. The torsion spring is arranged between the synchronizer ring and the knob, and the two torsion arms of the torsion spring abut against the first sector-shaped groove and the second sector-shaped groove.

[0013] Furthermore, the shift spring piece is mounted on the outer housing of the electric drill, and the shift spring piece is adapted to the shift grooves evenly arranged on the outer circumference of the knob.

[0014] Furthermore, the wheel rudder equipped with the synchronizer ring is also provided with a synchronously rotating pointer at the other end away from the synchronizer ring. For the convenience of indication, the outer shell is provided with scales or dials at the knob and the pointer.

[0015] On the other hand, the present invention provides an electric drill, which has the above-mentioned electric drill deceleration structure and also includes a torque adjustment device, the torque adjustment device including a plug, a plug pressure plate, a torque adjustment spring, a screw ring, and a torque adjustment ring, the torque adjustment ring is rotatably arranged on the outer shell, the screw ring is connected to the torque adjustment ring by a thread, the torque adjustment spring is held between the screw ring and the plug pressure plate, the plug is arranged on the side of the plug pressure plate away from the torque adjustment spring and is tightly pressed against the ring gear, the ring gear is rotatably arranged in the outer shell, and the end face of the ring gear is formed with a convex portion that can interact with the plug to drive the plug pressure plate to move.

[0016] Furthermore, the electric drill also includes a mode switching ring, which is rotatably provided on the outer shell. The mode switching ring can lock the head pressure plate by rotating, so that the ring gear cannot rotate.

[0017] The beneficial effects of the present invention compared to the prior art are:

[0018] 1. The electric drill's reduction gear structure consists of a wheel-type continuously variable transmission and a cycloid pinwheel reducer. It features a wide speed regulation range, stepless speed regulation, balanced operation, and low noise. It also overcomes the problems of gearbox grease easily flowing out of the shift hole and shift jamming in traditional structures.

[0019] 2. The electric drill equipped with this electric drill reduction mechanism is far superior to traditional gearbox hand drills in terms of speed, torque and impact rate in screwdriver mode. Because it can achieve stepless speed regulation, regardless of the power required, the user can always adjust the speed ratio of the reduction gear to ensure that the power motor always operates at maximum power or the highest energy efficiency.

[0020] 3. The electric drill is equipped with a torque adjustment device, which can realize output torque adjustment and overload protection functions.

[0021] 4. The knob shift device can realize the pre-load function. In the stopped state, the speed ratio of the wheel-type continuously variable transmission can be adjusted to the set value by turning the knob and according to the scale or dial on the outer shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A three-dimensional diagram of a speed reduction structure of an electric drill involved;

[0023] Figure 2 for Figure 1 Exploded diagram;

[0024] Figure 3 for Figure 2 Exploded view of the wheel-type continuously variable transmission;

[0025] Figure 4 for Figure 2 Exploded diagram of the cycloid reducer;

[0026] Figure 5 is a schematic diagram of the electric drill involved;

[0027] Figure 6 A schematic diagram of a knob shift device configured on a wheel-type continuously variable transmission;

[0028] Figure 7 for Figure 6 Exploded diagram;

[0029] Figure 8This is a schematic diagram of the connection between the knob shift device and a rudder;

[0030] Figure 9 Schematic diagram of the torque adjustment device inside the electric drill involved.

[0031] In the figure: 1. power motor; 11. motor shaft; 12. compression spring; 2. wheel-type continuously variable transmission; 21. transmission case; 22. driving ring plate; 23. gear plate; 24. steering wheel; 25. roller; 26. driven ring plate; 27. plane bearing; 3. cycloid pinwheel reducer; 31. input shaft; 32. eccentric bearing; 33. cycloid disk; 34. ring gear; 341. convex portion; 35. output shaft; 4. outer casing; 5. mode switching ring; 6. torque adjustment ring; 7. screw ring; 8. torque adjustment spring; 9. head pressure plate; 10. head; 20. knob shift device; 201. knob; 2011. second sector slot; 2012. gear slot; 202. gear spring plate; 203. torsion spring; 204. synchronizer ring; 2041. first sector slot; 205. pointer. DETAILED DESCRIPTION

[0032] like Figures 1 to 4 As shown, an electric drill reduction structure according to an embodiment of the present invention includes a power motor 1, a wheel-type continuously variable transmission 2 configured at the output end of the power motor 1, and a cycloid pinwheel reducer 3 configured at the output end of the wheel-type continuously variable transmission 2;

[0033] The wheel-type continuously variable transmission 2 includes a transmission case 21. Along the power transmission direction, an active ring disc 22, a wheel rudder 24, a driven ring disc 26, and a plane bearing 27 are sequentially provided in the transmission case 21. The wheel rudder 24 can be rotatably passed through the transmission case 21 and forms a mutually meshing structure through a gear plate 23 at the outlet end. A freely rotating roller 25 is provided in the middle of the wheel rudder 24. The power of the power motor 1 is output to the driven ring disc 26 via the active ring disc 22 and the roller 25. A knob shift device 20 for adjusting the meshing state of the gear plate 23 is provided outside the transmission case 21; the power motor 1 is connected to the active ring disc 22 by a motor shaft 11, and a compression spring 11 is arranged on the motor shaft 11. The compression spring 11 keeps the active ring disc 22 and the roller 25 in close contact through elastic force; the contact surfaces of the roller 25 and the active ring disc 22 and the driven ring disc 26 are spherical surfaces that match each other;

[0034] The cycloid pinwheel reducer 3 includes an input shaft 31 that rotates synchronously with the driven ring disk 26, two eccentric bearings 32 disposed on the input shaft 31, two cycloid disks 33 connected to the input shaft 31 via the two eccentric bearings 32, a ring gear 34 disposed outside the two cycloid disks 33, and an output shaft 35. The input shaft 31 transmits power to the output shaft 35 via the eccentric motion of the two cycloid disks 33.

[0035] In the figure, there are two rudders 24. Rotation of the rudders 24 can deflect the rollers 25, causing the centers of the contact lines between the rollers 25 and the active ring disk 22 and the driven ring disk 26 to change in the radial direction of the ring disk surface, thereby achieving speed change. Of course, it is also possible to increase the number of rudders 24 and rollers 25 to three to improve the stability of the ring disk. In this case, the toothed plate 23 on the rudder 24 needs to be changed from straight teeth to bevel teeth.

[0036] like Figures 6-8 As shown, the knob shift device 20 includes a knob 201, a gear spring sheet 202, a torsion spring 203, and a synchronizer ring 204. The synchronizer ring 204 is fixedly connected to the end of one of the rudders 24. The knob 201 is rotatably sleeved on the outside of the synchronizer ring 204. A first sector-shaped groove 2041 is formed on the synchronizer ring 204, and a matching second sector-shaped groove 2011 is formed on the knob 201. The torsion spring 203 is disposed between the synchronizer ring 204 and the knob 201. The torsion arm rests on the first sector groove 2041 and the second sector groove 2011; the gear spring piece 202 is mounted on the outer housing 4 of the electric drill, and the gear spring piece 202 is adapted to the gear grooves 2012 uniformly arranged on the outer circumference of the knob 201; the steering wheel 24 equipped with a synchronizer ring 204 is also provided with a synchronously rotating pointer 205 at the other end away from the synchronizer ring 204. For easy indication, the outer housing 4 is provided with scales or dials on the knob 201 and the pointer 205;

[0037] The gear shifting process of the knob shifting device 20 is as follows: during the operation of the electric drill, the rotation of the knob 201 drives the wheel rudder 24 to rotate via the torsion spring 203 and the synchronizer ring 204, so that the center of the contact line between the roller 25 and the active ring disk 22 and the driven ring disk 26 changes in the radial direction of the ring disk surface, thereby achieving speed change; when the motor is stopped, the knob 201 can also be rotated to achieve preload. At this time, the roller 25 is pressed by the active ring disk 22 and the driven ring disk 26 and is difficult to rotate, so that the synchronizer ring 204 is also difficult to rotate, and the knob 201 and the synchronizer ring 204 rotate relative to each other, causing the torsion spring 203 to generate A preload torque, when the electric drill starts running again, the preload torque causes the wheel rudder 24 and the roller 25 to gradually rotate to the set speed ratio; the outer shell 4 is generally provided with a scale at a position corresponding to the knob 201, and the outer shell 4 is generally provided with a transparent dial at a position corresponding to the pointer 205, so that the user can adjust the speed ratio to the required speed according to the working conditions; in addition, a gear spring piece 202 is provided on the outer shell 4, and the protrusion of the gear spring piece 202 is snapped into the gear groove 2012 evenly arranged on the outer circumference of the knob 201. In this way, under non-human rotation conditions, the gear spring piece 202 prevents the knob 201 from rotating.

[0038] like Figure 5 、 Figure 6As shown, an electric drill according to an embodiment of the present invention has the above-mentioned electric drill deceleration structure, and also includes a torque adjustment device, which includes a mandrel 10, a mandrel pressure plate 9, a torque adjustment spring 8, a screw ring 7, and a torque adjustment ring 6. The torque adjustment ring 6 is rotatably arranged on the outer shell 4, and the screw ring 7 is connected to the torque adjustment ring 6 by a thread. The torque adjustment spring 8 is held between the screw ring 7 and the mandrel pressure plate 9. The mandrel 10 is arranged on the side of the mandrel pressure plate 9 away from the torque adjustment spring 8 and is tightly pressed against the ring gear 34. The ring gear 34 is rotatably arranged in the outer shell 4. The end surface of the ring gear 34 is formed with a convex portion 341 that can interact with the mandrel 10 to drive the mandrel pressure plate 9 to move; the electric drill also includes a mode switching ring 5, which is rotatably arranged on the outer shell On the body 4, the mode switching ring 5 can lock the head pressure plate 9 by rotating, so that the ring gear 34 cannot rotate; because the torque adjustment ring 6 and the screw ring 7 are threaded, when the torque adjustment ring 6 is rotated, the screw ring 7 moves axially, so that the pressure of the torque adjustment spring 8 on the head pressure plate 9 changes; when the cycloid pinwheel reducer 3 outputs torque, the ring gear 34 will be subjected to reverse torque rotation; when the ring gear 34 is rotated to the convex portion 341 position, it will try to lift the head pressure plate 9 and squeeze the torque adjustment spring 8, so that the tighter the torque adjustment spring 8 is pressed, the greater the obstruction to the ring gear 34, and thus a greater torque can be output; in addition, the head pressure plate 9 can be locked by rotating the mode switching ring 5, so that the ring gear 34 cannot rotate, and the torque adjustment device loses torque limit and outputs hard torque.

[0039] The electric drill reduction structure includes two parts: a wheel-type continuously variable transmission and a cycloid pinwheel reducer. It has the characteristics of a wide speed regulation range, stepless speed regulation, balanced operation, and low noise. At the same time, it overcomes the problem of gear box grease easily flowing out of the shift hole and gear shift jamming in the traditional structure. The electric drill equipped with the electric drill reduction structure is far superior to the traditional gearbox hand drill in terms of speed, torque and impact rate in the screwdriver mode. Because it can achieve stepless speed regulation, no matter how much power is required, the user can always adjust the speed ratio of the reduction to make the power motor always operate at maximum power or highest energy efficiency. The electric drill is equipped with a torque adjustment device to achieve output torque adjustment and overload protection functions. The knob shift device can realize the preload function. In the stopped state, the speed ratio of the wheel-type continuously variable transmission can be adjusted to the set value by turning the knob and according to the scale or dial on the outer shell.

[0040] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An electric drill deceleration structure, characterized by: It comprises a power motor (1), a wheel-type continuously variable transmission (2) arranged at the output end of the power motor (1), and a cycloid pinwheel reducer (3) arranged at the output end of the wheel-type continuously variable transmission (2); The wheel-type continuously variable transmission (2) includes a transmission housing (21), wherein an active ring disc (22), a wheel rudder (24), a driven ring disc (26), and a plane bearing (27) are sequentially provided in the transmission housing (21) along a power transmission direction. The wheel rudder (24) is rotatably provided on the transmission housing (21) and forms a mutually meshing structure at the exit end through a tooth plate (23). A freely rotatable roller (25) is provided in the middle of the wheel rudder (24). The power of the power motor (1) is output to the driven ring disc (26) via the active ring disc (22) and the roller (25). A knob shift device (20) for adjusting the meshing state of the tooth plate (23) is provided outside the transmission housing (21); The cycloid pinwheel reducer (3) includes an input shaft (31) that rotates synchronously with the driven ring disk (26), two eccentric bearings (32) arranged on the input shaft (31), two cycloid disks (33) connected to the input shaft (31) via the two eccentric bearings (32), a ring gear (34) provided outside the two cycloid disks (33) and an output shaft (35), wherein the input shaft (31) transmits power to the output shaft (35) via the eccentric motion of the two cycloid disks (33).

2. The electric drill deceleration structure according to claim 1, characterized in that: The power motor (1) is connected to the active ring disc (22) by a motor shaft (11), and a compression spring (11) is arranged on the motor shaft (11). The compression spring (11) keeps the active ring disc (22) and the roller (25) in close contact with each other through elastic force.

3. The electric drill deceleration structure according to claim 2, characterized in that: The contact surfaces of the roller (25), the active ring disc (22), and the driven ring disc (26) are spherical surfaces that match each other.

4. The electric drill deceleration structure according to claim 3, characterized in that: There are two wheel rudders (24), and the knob shift device (20) comprises a knob (201), a gear spring sheet (202), a torsion spring (203), and a synchronizer ring (204). The synchronizer ring (204) is fixedly connected to the end of one of the wheel rudders (24). The knob (201) is rotatably sleeved on the outside of the synchronizer ring (204). A first fan-shaped groove (2041) is formed on the synchronizer ring (204), and a matching second fan-shaped groove (2011) is formed on the knob (201). The torsion spring (203) is arranged between the synchronizer ring (204) and the knob (201), and two torsion arms of the torsion spring (203) are against the first fan-shaped groove (2041) and the second fan-shaped groove (2011).

5. The electric drill deceleration structure according to claim 4, characterized in that: The shift spring piece (202) is mounted on the outer housing (4) of the electric drill, and the shift spring piece (202) is adapted to the shift slots (2012) evenly arranged on the outer circumference of the knob (201).

6. The electric drill deceleration structure according to claim 5, characterized in that: The steering wheel (24) equipped with the synchronization ring (204) is also provided with a synchronously rotating pointer (205) at the other end away from the synchronization ring (204). For the convenience of indication, the outer shell (4) is provided with scales or dials at the knob (201) and the pointer (205).

7. An electric drill having the electric drill speed reduction structure according to any one of claims 5 to 6, characterized in that: The invention also includes a torque adjustment device, which includes a mandrel (10), a mandrel pressure plate (9), a torque adjustment spring (8), a spiral ring (7), and a torque adjustment ring (6). The torque adjustment ring (6) is rotatably arranged on the outer shell (4). The spiral ring (7) is connected to the torque adjustment ring (6) by a thread. The torque adjustment spring (8) is supported between the spiral ring (7) and the mandrel pressure plate (9). The mandrel (10) is arranged on a side of the mandrel pressure plate (9) away from the torque adjustment spring (8) and is pressed against the ring gear (34). The ring gear (34) is rotatably arranged in the outer shell (4). The end face of the ring gear (34) is formed with a convex portion (341) that can interact with the mandrel (10) to drive the mandrel pressure plate (9) to move.

8. The electric drill according to claim 7, characterized in that: It also includes a mode switching ring (5), which is rotatably arranged on the outer shell (4). The mode switching ring (5) can lock the head pressure plate (9) by rotating, so that the ring gear (34) cannot rotate.

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