Screwdriver capable of quickly shifting gears

Abstract

The utility model discloses a fast gear shifting screwdriver which comprises a rack body, a driving motor and a speed reducer assembly are arranged in the rack body, and the driving motor drives the speed reducer assembly to rotate when working. A working head is arranged at the opening end of the rack main body, a transmission shaft is arranged between the working head and the speed reducer assembly, the outer layer of the transmission shaft is sleeved with a striking block, and an impact spring is arranged between the striking block and the speed reducer assembly; torsion steel balls are arranged between the striking block and the transmission shaft. A rotating speed gear adjusting assembly is arranged at the front end of the machine frame body and located below the working head. The rotating speed gear adjusting assembly is arranged close to the holding part of the machine frame body. A main control circuit board is arranged below the machine frame body and electrically connected with the rotating speed gear adjusting assembly. According to the utility model, different electric signals are sent to the main control circuit board through the rotating speed gear adjusting assembly, so that different rotating speeds are output; the rotating speed gear adjusting assembly is arranged close to the holding part of the rack body, and rotating speed switching is easy and convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of screwdrivers, and particularly relates to a screwdriver with quick gear shifting. Background Art

[0002] A screwdriver is a commonly used power tool. Traditional screwdrivers often do not have the function of independently adjusting gears; even if some screwdrivers have the function of adjusting gears, the operation is not very convenient. The gear adjustment module of the screwdriver is often set near the battery pack; when the screwdriver is in the working state and the operator needs to adjust the rotation speed, the operator can only control the operation with both hands, which is very inconvenient and the working efficiency is low. Therefore, it is necessary to design a screwdriver with quick gear shifting to overcome the above difficulties. Summary of the Invention

[0003] In view of the problems existing in the prior art, the utility model designs a screwdriver with quick gear shifting. The rotation speed gear adjustment component of the utility model sends different electrical signals to the main control circuit board by pressing, so that the driving motor has different rotation speeds; the rotation speed gear adjustment component is arranged close to the holding part of the frame body, and the rotation speed switching is simple and convenient.

[0004] The invention purpose of the utility model is realized by the following technical scheme: A screwdriver with quick gear shifting, including a frame body, a driving motor and a reducer assembly are arranged in the frame body, and the driving motor drives the reducer assembly to rotate when working; an opening end of the frame body is provided with a working head rotatably connected thereto, a transmission shaft is arranged between the working head and the reducer assembly, a striking block is sleeved and installed on the outer layer of the transmission shaft, and an impact spring is arranged between the striking block and the reducer assembly; a torsion steel ball is arranged between the striking block and the transmission shaft; a rotation speed gear adjustment component is arranged at the front end of the frame body and below the working head, and the rotation speed gear adjustment component is arranged close to the holding part of the frame body; a main control circuit board is arranged below the frame body, and the main control circuit board is electrically connected with the rotation speed gear adjustment component.

[0005] Preferably, the reducer assembly includes a gear box cover, a fixed gear ring and a plurality of planetary gears arranged in the fixed gear ring; the gear box cover is fixedly installed in the frame body, and the motor shaft of the driving motor is rotatably connected with the gear box cover; the motor shaft of the driving motor extends into the transmission shaft, and the motor shaft of the driving motor meshes and rotates with the planetary gears; the transmission shaft is installed on the gear box cover through a bearing, and the transmission shaft includes a shaft body and an installation base.

[0006] When the drive motor is working, it drives the planetary gears of the reducer assembly to rotate, and when the planetary gears rotate, it drives the transmission shaft to rotate. By setting the reducer assembly, the transmission shaft will have a larger output torque. When there is no load or the load is very small, the transmission shaft rotates through the striking block to drive the working head to rotate. When the load on the working head is very large, the working head rotates very slowly or almost does not rotate; at this time, the striking block will move away from the working head along the axial direction of the transmission shaft, and the striking block will also rotate under the drive of the torsion steel ball; then the striking block moves back and forth along the transmission shaft by overcoming the elastic force of the impact spring, thereby continuously hitting the working head.

[0007] Preferably, the shaft body and the mounting base are integrally formed; a planetary gear is provided in the mounting base, and the mounting base and the planetary gear are connected by a shaft; and a fixed gear ring is provided adjacent to the mounting base. By providing the mounting base, it is convenient to install the planetary gear, and the rotation of the planetary gear can drive the mounting base to rotate relative to the gear box cover.

[0008] Preferably, the outer sleeve of the shaft body is equipped with a striking block, which is arranged in the frame body, and the striking block and the working head are arranged adjacent to each other; an impact spring is arranged between the striking block and the mounting base; one end of the impact spring rests on the striking block, and the other end rests on the mounting base; a torsion steel ball is arranged between the shaft body and the striking block.

[0009] Preferably, the shaft body is provided with a first channel for installing a torsion steel ball, and the striking block is provided with a second channel for installing a torsion steel ball, and the first channel and the second channel are arranged in pairs; the torsion steel ball is arranged between the first channel and the second channel, and the first channel and the second channel surround to form a route for the movement of the torsion steel ball.

[0010] When the load on the working head is very small, the striking block cannot overcome the elastic force of the impact spring, so the rotation of the transmission shaft synchronously drives the striking block to rotate, and the rotation of the striking block drives the working head to rotate. When the load on the working head is very large, the working head rotates very slowly or almost does not rotate, but the drive motor still drives the transmission shaft to rotate continuously. At this time, the striking block will be subjected to a force away from the working head along the transmission shaft. The striking block and the torsion steel ball move away from the working head along the route surrounded by the first channel and the second channel. When the striking block moves away from the working head, the impact spring is in a compressed state; when the striking block and the torsion steel ball are separated from the route on the transmission shaft, the striking block automatically resets under the action of the impact spring; then the striking block will continue to move axially in a reciprocating cycle, and the striking block will rotate while moving, so the striking block will continue to hit the working head.

[0011] Preferably, the end face of the striking block facing the working head is provided with striking protrusions, and the bottom of the working head is provided with paired outward protrusions, and the outward protrusions and the striking protrusions correspond one by one; the working head is installed in the main body of the frame through a bearing, and an annular groove is provided in the main body of the frame, and an annular retaining piece and a limiting retaining ring are provided in the annular groove, the annular retaining piece is arranged in contact with the bearing, and the limiting retaining ring is arranged adjacent to the annular retaining piece.

[0012] By providing the annular retaining piece and the limiting retaining ring, the bearing is limited, so as to prevent the working head from detaching from the main body of the frame. When the load of the working head is very small, the side walls of the striking protrusions and the outward protrusions are in contact with each other, so that the striking block can drive the working head to rotate when the striking block rotates. When the load of the working head is very large, at this time the working head rotates very slowly or hardly rotates at all, but at this time the transmission shaft is still rotating; in this way, the striking block will have an axial action away from the working head, so that the outward protrusion will be displaced forward and backward from the striking protrusion; the striking block moves along the first channel and the second channel and automatically resets, so that the striking protrusion will continuously and cyclically strike the outward protrusion.

[0013] Preferably, the speed gear adjustment assembly includes a mounting bracket, an elastic button and an adjustment circuit board; a patch button electrically connected to the adjustment circuit board is provided on the adjustment circuit board, and the adjustment circuit board is electrically connected to the main control circuit board; the mounting bracket is arranged in the main body of the frame, and the adjustment circuit board is provided on the mounting bracket; an elastic button capable of axially moving relative to the adjustment circuit board is provided on the end face of the mounting bracket, and when the elastic button contacts the patch button, the adjustment circuit board sends an electrical signal to the main control circuit board.

[0014] When the speed needs to be adjusted, press the elastic button, so that the elastic button will contact the patch button, and then the adjustment circuit board will send an electrical signal to the main control circuit board. By pressing the elastic button different numbers of times, the main control circuit board will receive different electrical signals, so as to output different speeds. Since the elastic button is arranged close to the holding part of the main body of the frame, the operator can operate the screwdriver and adjust the speed with one hand at the same time, making the operation more convenient.

[0015] Preferably, the speed gear adjustment assembly is installed in the main body of the frame, and the main body of the frame includes two symmetrically arranged shells, and the shells are fixed by screws; a limiting part and a limiting step are provided in the shell, and a mounting bracket is arranged between the limiting part and the limiting step; a first protrusion is provided on the mounting bracket, and the first protrusion abuts against the limiting step; a first groove is provided on the limiting part, and a second protrusion is provided on the mounting bracket, and the second protrusion is stuck in the first groove. By providing the limiting part and the limiting step, it is convenient to position and install the mounting bracket.

[0016] Preferably, a first card slot is provided in the mounting bracket, and an adjustment circuit board is provided in the first card slot; a second card slot is also provided in the mounting bracket, and the edge of the elastic button is stuck in the corresponding second card slot. By providing the first card slot, it is convenient to install the adjustment circuit board; by providing the second card slot, it is convenient to position the elastic button.

[0017] Compared with the prior art, the utility model has the following beneficial effects: 1. The utility model can conveniently adjust the rotation speed of the drive motor through the rotation speed gear adjustment component, and has good versatility. 2. The rotation speed gear adjustment component is arranged close to the holding part of the frame body, so that it is convenient for the operator to adjust the rotation speed with one hand; the operator can press the switch button of the screwdriver with a finger, and at the same time can press the elastic button with a finger, and the operation is simple and convenient. 3. The transmission shaft is driven to rotate by the reducer component, and the working head rotates when the rotating shaft rotates, and the working head outputs a large torque and has a good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a perspective view of the utility model;

[0019] Figure 2 is an internal structure diagram of the utility model;

[0020] Figure 3 is an exploded view of the utility model;

[0021] Figure 4 is an exploded view of the utility model from another perspective;

[0022] Figure 5 is a perspective view of the striking block;

[0023] Figure 6 is a perspective view of the transmission shaft;

[0024] Figure 7 is an exploded view of the rotation speed gear adjustment component;

[0025] Figure 8 is a perspective view of the mounting bracket;

[0026] Figure 9 is an internal structure diagram of the housing;

[0027] Markings in the figure: 1. Frame body; 2. Driving motor; 3. Reducer assembly; 31. Gearbox cover; 32. Fixed gear ring; 33. Planet gear; 4. Working head; 41. Convex part; 5. Transmission shaft; 51. Shaft body; 52. Mounting base; 6. Impact block; 61. Impact projection; 7. Impact spring; 8. Torque steel ball; 9. Rotation speed gear adjustment assembly; 91. Mounting bracket; 92. Elastic button; 93. Adjustment circuit board; 94. Patch button; 10. Main control circuit board; 11. First channel; 12. Second channel; 13. Annular groove; 14. Annular retaining plate; 15. Limit retaining ring; 16. Housing; 17. Limiting part; 18. Limiting step; 19. First projection; 20. First groove; 21. Second projection; 22. First card slot; 23. Second card slot. Detailed implementation mode

[0028] The present utility model will be further described below in conjunction with the embodiments shown in the accompanying drawings:

[0029] As Figures 1 to 9 shown, this embodiment discloses a screwdriver with quick gear shifting, including a frame body 1. A driving motor 2 and a reducer assembly 3 are arranged inside the frame body 1. When the driving motor 2 works, it drives the reducer assembly 3 to rotate; an opening end of the frame body 1 is provided with a working head 4 rotatably connected thereto. A transmission shaft 5 is arranged between the working head 4 and the reducer assembly 3. An impact block 6 is sleeved and installed on the outer layer of the transmission shaft 5. An impact spring 7 is arranged between the impact block 6 and the reducer assembly 3; a torque steel ball 8 is arranged between the impact block 6 and the transmission shaft 5; a rotation speed gear adjustment assembly 9 is arranged at the front end of the frame body 1 and below the working head 4. The rotation speed gear adjustment assembly 9 is arranged close to the holding part of the frame body 1; a main control circuit board 10 is arranged below the frame body 1. The main control circuit board 10 is electrically connected to the rotation speed gear adjustment assembly 9.

[0030] The speed reducer assembly 3 includes a gearbox cover 31, a fixed gear ring 32, and a plurality of planetary gears 33 arranged inside the fixed gear ring 32; the gearbox cover 31 is fixedly installed in the frame body 1, and the motor shaft of the drive motor 2 is rotatably connected to the gearbox cover 31; the motor shaft of the drive motor 2 extends into the transmission shaft 5, and the motor shaft of the drive motor 2 meshes and rotates with the planetary gear 33; the transmission shaft 5 is installed on the gearbox cover 31 through a bearing, and the transmission shaft 5 includes a shaft body 51 and a mounting base 52. The shaft body 51 and the mounting base 52 are integrally formed; the mounting base 52 is provided with a planetary gear 33, and the mounting base 52 and the planetary gear 33 are connected by a shaft; the fixed gear ring 32 is arranged adjacent to the mounting base 52. A striking block 6 is sleeved and installed on the outer layer of the shaft body 51, the striking block 6 is arranged in the frame body 1, and the striking block 6 is arranged adjacent to the working head 4; an impact spring 7 is arranged between the striking block 6 and the mounting base 52; one end of the impact spring 7 abuts against the striking block 6, and the other end abuts against the mounting base 52; a torsion steel ball 8 is arranged between the shaft body 51 and the striking block 6. A first channel 11 for installing the torsion steel ball 8 is provided on the shaft body 51, a second channel 12 for installing the torsion steel ball 8 is provided on the striking block 6, and the first channel 11 and the second channel 12 are arranged in pairs; the torsion steel ball 8 is arranged between the first channel 11 and the second channel 12, and the first channel 11 and the second channel 12 surround to form a path for the movement of the torsion steel ball 8. A striking protrusion 61 is provided on the end face of the striking block 6 facing the working head 4, and a pair of outward protrusions 41 are provided at the bottom of the working head 4, and the outward protrusions 41 and the striking protrusions 61 correspond one by one; the working head 4 is installed in the frame body 1 through a bearing, a circular groove 13 is provided in the frame body 1, a circular retaining piece 14 and a limit retaining ring 15 are provided in the circular groove 13, the circular retaining piece 14 is attached to the bearing, and the limit retaining ring 15 is arranged adjacent to the circular retaining piece 14.

[0031] The speed gear adjustment component 9 includes a mounting bracket 91, an elastic button 92 and an adjustment circuit board 93; the adjustment circuit board 93 is provided with a patch button 94 electrically connected thereto, and the adjustment circuit board 93 is electrically connected to the main control circuit board 10; the mounting bracket 91 is arranged in the frame body 1, and the adjustment circuit board 93 is provided on the mounting bracket 91; an elastic button 92 that can move axially relative to the adjustment circuit board 93 is provided on the end surface of the mounting bracket 91, and when the elastic button 92 contacts the patch button 94, the adjustment circuit board 93 sends an electrical signal to the main control circuit board 10. The speed gear adjustment assembly 9 is installed in the frame body 1, and the frame body 1 includes two symmetrically arranged housings 16, which are fixed by screws; a limit portion 17 and a limit step 18 are provided in the housing 16, and a mounting bracket 91 is provided between the limit portion 17 and the limit step 18; a first protrusion 19 is provided on the mounting bracket 91, and the first protrusion 19 abuts against the limit step 18; a first groove 20 is provided on the limit portion 17, and a second protrusion 21 is provided on the mounting bracket 91, and the second protrusion 21 is stuck in the first groove 20. A first card slot 22 is provided in the mounting bracket 91, and an adjustment circuit board 93 is provided in the first card slot 22; a second card slot 23 is also provided in the mounting bracket 91, and the edge of the elastic button 92 is stuck in the corresponding second card slot 23.

[0032] The specific operation process of this embodiment is as follows: when the load of the working head 4 is very small, the striking block 6 cannot overcome the elastic force of the impact spring 7, so that the transmission shaft 5 rotates synchronously to drive the striking block 6 to rotate, and the striking block 6 rotates to drive the working head 4 to rotate. When the load of the working head 4 is very large, the working head 4 rotates very slowly or almost does not rotate, but the driving motor 2 still drives the transmission shaft 5 to rotate continuously. At this time, the striking block 6 will be subjected to a force along the transmission shaft 5 away from the working head 4. The striking block 6 and the torsion steel ball 8 move away from the working head 4 along the route surrounded by the first channel 11 and the second channel 12. When the striking block 6 moves away from the working head 4, the impact spring 7 is in a compressed state; when the striking block 6 and the torsion steel ball 8 are separated from the route on the transmission shaft 5, the striking block 6 automatically resets under the action of the impact spring 7; then the striking block 6 will continue to reciprocate and cyclically move axially, and the striking block 6 will rotate while moving, so the striking block 6 will continue to knock the working head.

[0033] When the speed needs to be adjusted, the elastic button 92 is pressed, so that the elastic button 92 contacts the patch button 94, and the adjustment circuit board 93 sends an electrical signal to the main control circuit board 10. By pressing the elastic button 92 for different times, the main control circuit board 10 receives different electrical signals, thereby outputting different speeds. Since the elastic button 92 is arranged close to the gripping portion of the frame body 1, the operator can operate the screwdriver and adjust the speed at the same time with one hand, which is more convenient to operate.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art to which the present utility model pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A screwdriver machine with quick gear shifting, comprising a frame body (1), characterized in that, Inside the frame main body (1), there is a driving motor (2) and a speed reducer assembly (3). When the driving motor (2) works, it drives the speed reducer assembly (3) to rotate; at the open end of the frame main body (1), there is a working head (4) rotatably connected thereto. Between the working head (4) and the speed reducer assembly (3), there is a transmission shaft (5). An impact block (6) is sleeved and installed on the outer layer of the transmission shaft (5). Between the impact block (6) and the speed reducer assembly (3), there is an impact spring (7); between the impact block (6) and the transmission shaft (5), there is a torsion steel ball (8); at the front end of the frame main body (1) and below the working head (4), there is a speed gear adjustment assembly (9), and the speed gear adjustment assembly (9) is arranged close to the holding part of the frame main body (1); below the frame main body (1), there is a main control circuit board (10), and the main control circuit board (10) is electrically connected to the speed gear adjustment assembly (9).

2. The screwdriver machine with quick gear shifting according to claim 1, characterized in that, The speed reducer assembly (3) includes a gearbox cover (31), a fixed gear ring (32), and several planetary gears (33) arranged inside the fixed gear ring (32); the gearbox cover (31) is fixedly installed inside the frame main body (1), and the motor shaft of the driving motor (2) is rotatably connected to the gearbox cover (31); The motor shaft of the driving motor (2) extends into the transmission shaft (5), and the motor shaft of the driving motor (2) meshes and rotates with the planetary gear (33); the transmission shaft (5) is installed on the gearbox cover (31) through a bearing, and the transmission shaft (5) includes a shaft body (51) and a mounting base (52).

3. The screwdriver machine with quick gear shifting according to claim 2, wherein, The shaft body (51) and the mounting base (52) are integrally formed; the mounting base (52) is provided with a planetary gear (33) inside, and the mounting base (52) and the planetary gear (33) are connected by a shaft; the fixed gear ring (32) is arranged adjacent to the mounting base (52).

4. The screwdriver machine with quick gear shifting according to claim 2, characterized in that, The outer layer of the shaft body (51) is sleeved and installed with an impact block (6). The impact block (6) is arranged inside the frame main body (1) and is adjacent to the working head (4); between the impact block (6) and the mounting base (52), there is an impact spring (7); one end of the impact spring (7) abuts against the impact block (6), and the other end abuts against the mounting base (52); between the shaft body (51) and the impact block (6), there is a torsion steel ball (8).

5. The screwdriver machine with quick gear shifting according to claim 4, characterized in that, The shaft body (51) is provided with a first channel (11) for installing the torsion steel ball (8), and the impact block (6) is provided with a second channel (12) for installing the torsion steel ball (8). The first channel (11) and the second channel (12) are arranged in pairs; the torsion steel ball (8) is arranged between the first channel (11) and the second channel (12), and the first channel (11) and the second channel (12) enclose a route for the movement of the torsion steel ball (8).

6. The screwdriver machine with quick gear shifting according to claim 4, characterized in that, The end face of the striking block (6) facing the working head (4) is provided with a striking protrusion (61), and the bottom of the working head (4) is provided with a pair of outwardly protruding parts (41) arranged in pairs, and the outwardly protruding parts (41) and the striking protrusions (61) correspond one by one; the working head (4) is installed in the frame body (1) through a bearing, and an annular groove (13) is provided in the frame body (1), and an annular retaining piece (14) and a limiting retaining ring (15) are provided in the annular groove (13), the annular retaining piece (14) is arranged in contact with the bearing, and the limiting retaining ring (15) is arranged adjacent to the annular retaining piece (14).

7. The screwdriver machine with quick gear shifting according to claim 1, characterized in that, The rotation speed gear adjustment assembly (9) includes a mounting bracket (91), an elastic button (92) and an adjustment circuit board (93); a patch button (94) electrically connected thereto is provided on the adjustment circuit board (93), and the adjustment circuit board (93) is electrically connected to the main control circuit board (10); the mounting bracket (91) is arranged in the frame body (1), and the adjustment circuit board (93) is provided on the mounting bracket (91); an elastic button (92) capable of axially moving relative to the adjustment circuit board (93) is provided on the end face of the mounting bracket (91), and when the elastic button (92) contacts the patch button (94), the adjustment circuit board (93) sends an electrical signal to the main control circuit board (10).

8. The screwdriver machine with quick gear shifting according to claim 7, characterized in that, The rotation speed gear adjustment assembly (9) is installed in the frame body (1), and the frame body (1) includes two symmetrically arranged shells (16), and the shells (16) are fixed by screws; a limiting part (17) and a limiting step (18) are provided in the shell (16), and a mounting bracket (91) is provided between the limiting part (17) and the limiting step (18); a first protrusion (19) is provided on the mounting bracket (91), and the first protrusion (19) abuts against the limiting step (18); a first groove (20) is provided on the limiting part (17), and a second protrusion (21) is provided on the mounting bracket (91), and the second protrusion (21) is stuck in the first groove (20).

9. The screwdriver machine with quick gear shifting according to claim 7, characterized in that, A first card slot (22) is provided in the mounting bracket (91), and the adjustment circuit board (93) is provided in the first card slot (22); a second card slot (23) is further provided in the mounting bracket (91), and the edge of the elastic button (92) is stuck in the corresponding second card slot (23).

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