An electric screwdriver

Abstract

The present invention discloses an electric screwdriver, which includes an output shaft, a housing, a power output disc, an internal and external gear, a shifting member, a transmission device and a motor. The outer surface of the internal and external gear is provided with first external teeth, and the inner surface of the internal and external gear is provided with internal teeth. The rear end of the output shaft is provided with second external teeth adapted to the internal teeth. The internal and external gear is located inside the housing. The rear end of the output shaft passes through the front end of the housing to be connected to the internal and external gear. The outer surface of the internal and external gear is further provided with a receiving groove, and part of the shifting member is received in the receiving groove. The front end of the power output disc is provided with third external teeth adapted to the internal teeth. The shifting member can drive the internal and external gear to move axially up and down. The motor is connected to the rear end of the power output disc through the transmission device. The internal and external gear and the shifting member of the present invention can play a clutch role, can prevent accidental touching of the motor switch and cause accidental rotation of the output shaft, avoid damage to the output shaft, other objects or the accidental operator, and improve the safety of the electric screwdriver.

Description

Technical Field

[0001] The invention relates to the technical field of electric tools, in particular to an electric screwdriver. Background Art

[0002] An electric screwdriver, also known as an electric screwdriver, electric screwdriver, electric screwdriver, etc., is an electric tool used to tighten and loosen screws. The existing invention patent with application publication number CN109176377A discloses a reversible screwdriver with two working modes, manual and electric. The power source, a circuit board for controlling the rotation of the power source, and a power supply for the power source and the circuit board are provided in the handle. The power source is connected to the working rod to realize the electric torque output. The circuit board is connected to the control switch and the steering switch. The handle is provided with a button corresponding to the control switch. The reversing dial extends to the steering switch. The reversing sleeve is rotated relative to the handle to switch the steering switch with the reversing dial to switch the electric torque output direction of the working rod; the manual torque output direction is the same as the electric torque output direction. The user can choose the manual working mode to output a larger torque or choose the electric working mode for fast screwing according to the needs.

[0003] The above-mentioned existing invention patent has the following technical problems: its power source and the working rod are always in a state of transmission connection, which may cause the power switch of the power source to be accidentally touched during the transportation of the reversible screwdriver or when the reversible screwdriver is in an idle state, and the power source will be turned on to drive the working rod to rotate, which may cause the working rod to touch other objects and cause damage to the objects and / or the working rod, and may also cause harm to the operator by mistake, that is, the reversible screwdriver has certain safety risks. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides an electric screwdriver that can solve the above technical problems.

[0006] (II) Technical solution

[0007] To solve the above technical problems, the present invention provides the following technical solution: an electric screwdriver, comprising: an output shaft, a housing, a power output disk, an internal and external gear, a shifting member, a transmission device, and a motor. The outer surface of the internal and external gear is provided with first external teeth, and the inner surface of the internal and external gear is provided with internal teeth. The rear end of the output shaft is provided with second external teeth adapted to the internal teeth. The internal and external gear is located inside the housing. The rear end of the output shaft passes through the front end of the housing to be connected to the internal and external gear. The outer surface of the internal and external gear is further provided with a receiving groove. Part of the shifting member is received in the receiving groove, and the end of the shifting member extends out of the housing. The front end of the power output disk is provided with third external teeth adapted to the internal teeth. The shifting member can drive the internal and external gear to move axially up and down. The motor is arranged at the rear end of the housing, and the motor is connected to the rear end of the power output disk through the transmission device.

[0008] Preferably, the shifting member includes an arc-shaped member and two extending members. The two extending members are respectively arranged at both ends of the arc-shaped member. The arc-shaped member is received in the receiving groove, and the extending members extend out of the housing.

[0009] Preferably, the housing is provided with a vertical sliding groove corresponding to the extending member.

[0010] Preferably, the electric screwdriver further includes a shifting outer shell arranged on the outer wall of the housing. The shifting outer shell is provided with two oblique sliding grooves corresponding to the two extending members. The outer ends of the extending members are located in the oblique sliding grooves. The shifting outer shell is further provided with a convex block. The oblique sliding groove includes a first horizontal portion at the upper end, a second horizontal portion at the lower end, and an oblique portion in the middle.

[0011] Preferably, the electric screwdriver further includes a pawl and a left and right shifting piece. The pawl is connected to the first external teeth, the inner ends of the left and right shifting pieces are connected to the pawl, and the outer ends of the left and right shifting pieces extend out of the housing.

[0012] Preferably, the transmission device includes a first gear, and the motor is connected to the rear end of the power output disk through the first gear.

[0013] Preferably, the transmission device further includes a second gear and a gear disk. The rear end of the power output disk is provided with a first connecting column. The first gear is arranged on the first connecting column. The front end of the gear disk is provided with a third gear. The first gear is connected to the third gear. The rear end of the gear disk is provided with a second connecting column. The second gear is arranged on the second connecting column. The second gear is connected to the motor teeth of the motor.

[0014] Preferably, the number of both the first gear and the second gear is multiple.

[0015] Preferably, a bearing is arranged on the output shaft.

[0016] Preferably, a motor plate is arranged at the rear end of the housing, and the motor is arranged on the motor plate.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides an electric screwdriver, which has the following beneficial effects: The present invention is provided with internal and external gears and a shifting member that can act as a clutch. When using the electric screwdriver, the internal and external gears are driven downward by the shifting member so that the internal teeth of the internal and external gears are simultaneously connected to the second external teeth of the output shaft and the third external teeth of the power output disk, enabling the power output disk to output power to the output shaft and thus realizing the rotation of the output shaft. When the electric screwdriver is in the transportation process or in an idle state, the internal and external gears are driven upward by the shifting member so that the internal and external gears are disengaged from the connection with the power output disk and only connected to the output shaft. That is, at this time, the power output disk cannot output power to the output shaft, which can prevent accidental actuation of the motor switch and resulting accidental rotation of the output shaft, avoiding damage to the output shaft, other objects, or the accidental operator, and improving the safety of the electric screwdriver. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a perspective view of an electric screwdriver according to the present invention;

[0020] Figure 2 is a perspective view of the output shaft and the housing of the present invention;

[0021] Figure 3 is a perspective view of the shifting member of the present invention;

[0022] Figure 4 is a perspective view of the internal and external gears, the shifting member, the pawl, and the left and right paddles of the present invention;

[0023] Figure 5 is a perspective view of the internal and external gears of the present invention;

[0024] Figure 6 is a perspective view of the output shaft, the internal and external gears, and the power output disk of the present invention;

[0025] Figure 7 is a perspective view of the output shaft of the present invention;

[0026] Figure 8 is a perspective view of the power output disk of the present invention;

[0027] Figure 9 is a perspective view of the shifting housing of the present invention;

[0028] Figure 10 is a perspective view of the transmission device and the power output disk of the present invention;

[0029] Figure 11 is a perspective view of the tooth disk of the present invention.

[0030] The reference numerals in the figure are: 1 output shaft, 2 housing, 3 power output disc, 4 internal and external gears, 5 shifting member, 6 motor, 7 first external teeth, 8 internal teeth, 9 second external teeth, 10 receiving groove, 11 third external teeth, 12 arc-shaped member, 13 extension member, 14 shifting housing, 15 oblique chute, 16 bump, 17 first horizontal portion, 18 second horizontal portion, 19 oblique portion, 20 pawl, 21 left and right paddles, 22 first gear, 23 second gear, 24 toothed disc, 25 first connecting column, 26 third gear, 27 second connecting column, 28 motor teeth, 29 bearing, 30 motor plate. Detailed implementation manner

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] The present invention provides an electric screwdriver, including: an output shaft 1, a housing 2, a power output disc 3, internal and external gears 4, a shifting member 5, a transmission device, and a motor 6. The outer surface of the internal and external gears 4 is provided with first external teeth 7, the inner surface of the internal and external gears 4 is provided with internal teeth 8, and the rear end of the output shaft 1 is provided with second external teeth 9 adapted to the internal teeth 8. The internal and external gears 4 are located in the housing 2, and the rear end of the output shaft 1 passes through the front end of the housing 2 to be connected to the internal and external gears 4. The outer surface of the internal and external gears 4 is further provided with a receiving groove 10, and part of the shifting member 5 is received in the receiving groove 10, and the end of the shifting member 5 extends out of the housing 2. The front end of the power output disc 3 is provided with third external teeth 11 adapted to the internal teeth 8. The shifting member 5 can drive the internal and external gears 4 to move axially up and down. The motor 6 is arranged at the rear end of the housing 2, and the motor 6 is connected to the rear end of the power output disc 3 through the transmission device. In addition, a working rod is provided at the front end of the output shaft 1 for tightening and loosening screws; specifically, a magnet can be provided inside the front end of the output shaft 1 to facilitate the replacement of working rods of different models.

[0033] When the electric screwdriver is to be used, the internal and external gears 4 are driven by the shifting member 5 to move downward so that the internal teeth 8 of the internal and external gears 4 are simultaneously connected to the second external teeth 9 of the output shaft 1 and the third external teeth 11 of the power output disc 3; the motor 6 drives the power output disc 3 to rotate through the transmission device; further, the power output disc 3 drives the output shaft 1 to rotate through the internal and external gears 4.

[0034] When the electric screwdriver is in the process of transportation or in an idle state, the internal and external gears 4 are driven to move upward by the shifting member 5, so that the internal and external gears 4 are disengaged from the power output disk 3. That is, at this time, the internal and external gears 4 are only connected to the output shaft 1. That is, at this time, the power output disk 3 cannot output power to the output shaft 1, which can prevent the switch of the motor 6 from being accidentally touched and causing the output shaft 1 to rotate accidentally, avoiding damage to other objects, the output shaft 1 or the accidental operator, thereby improving the safety of the electric screwdriver.

[0035] Specifically, the shifting member 5 includes an arc-shaped member 12 and two extending members 13. The two extending members 13 are respectively arranged at both ends of the arc-shaped member 12. The arc-shaped member 12 is received in the receiving groove 10, and the extending member 13 extends out of the housing 2. By moving the extending member 13 upward or downward, the internal and external gears 4 can be driven to move. Preferably, the arc-shaped member 12 and the extending member 13 are integrally formed; the shifting member 5 is preferably a shifting wire.

[0036] Furthermore, the housing 2 is provided with a vertical sliding groove corresponding to the extending member 13 for the shifting member 5 to move axially up and down. Preferably, this embodiment further includes a shifting outer shell 14 arranged on the outer wall of the housing 2. The shifting outer shell 14 is provided with two oblique sliding grooves 15 corresponding to the two extending members 13. The outer ends of the extending members 13 are located in the oblique sliding grooves 15. The shifting outer shell 14 is also provided with a convex block 16. The oblique sliding groove 15 includes a first horizontal portion 17 at the upper end, a second horizontal portion 18 at the lower end, and an oblique portion 19 in the middle. When it is necessary to drive the internal and external gears 4 to move axially up and down, by pushing the convex block 16 of the shifting outer shell 14, the shifting member 5 can be driven to move up and down along the vertical sliding groove and the oblique sliding groove 15; it should be understood that the oblique sliding groove 15 of the shifting outer shell 14 can play a role in protecting the shifting member 5 to prevent the internal and external gears 4 from being accidentally operated.

[0037] In addition, the electric screwdriver may further include a pawl 20 and a left and right paddle 21. The pawl 20 is connected to the first external teeth 7 of the above-mentioned internal and external gears 4. The inner ends of the left and right paddles 21 are connected to the pawl 20. The outer ends of the left and right paddles 21 extend out of the housing 2. By operating the left and right paddles 21 to the left or right, through the cooperation of the pawl 20 and the internal and external gears 4, the output shaft 1 can be switched to output torque in the clockwise or counterclockwise direction.

[0038] Specifically, the transmission device includes a first gear 22. The motor 6 is connected to the rear end of the power output disk 3 through the first gear 22. Further, the transmission device of the present embodiment further includes a second gear 23 and a toothed disk 24. A first connecting column 25 is provided at the rear end of the power output disk 3. The first gear 22 is disposed on the first connecting column 25. A third gear 26 is provided at the front end of the toothed disk 24. The first gear 22 is connected to the third gear 26. A second connecting column 27 is provided at the rear end of the toothed disk 24. The second gear 23 is disposed on the second connecting column 27. The second gear 23 is connected to the motor gear 28 of the motor 6.

[0039] The transmission process of the transmission device of the present embodiment is as follows: The motor gear 28 of the motor 6 drives the second gear 23 to rotate, that is, the rotation of the toothed disk 24 is realized; the third gear 26 of the toothed disk 24 further drives the first gear 22 to rotate, that is, the rotation of the power output disk 3 is realized. Preferably, the number of the first gears 22 and the second gears 23 is multiple. The first gears 22 and the second gears 23 may specifically adopt planetary gears.

[0040] In addition, a bearing 29 is provided on the output shaft 1. Specifically, a motor plate 30 may be provided at the rear end of the housing 2. The motor 6 is disposed on the motor plate 30.

[0041] Compared with the prior art, the present invention provides an electric screwdriver, which has the following beneficial effects: The present invention is provided with internal and external gears and a shifting member that can play a clutch role. When the electric screwdriver is to be used, the internal and external gears are driven by the shifting member to move downward, so that the internal teeth of the internal and external gears are simultaneously connected to the second external teeth of the output shaft and the third external teeth of the power output disk, that is, the power output disk can output power to the output shaft to realize the rotation of the output shaft; when the electric screwdriver is in the transportation process or in the idle state, the internal and external gears are driven by the shifting member to move upward, so that the internal and external gears are disengaged from the connection with the power output disk and only connected to the output shaft, that is, at this time the power output disk cannot output power to the output shaft, which can prevent the accidental touch of the motor switch and cause the accidental rotation of the output shaft, avoid damage to the output shaft, other objects or the accidental operator, and improve the safety of the electric screwdriver.

[0042] It should be noted that the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric screwdriver, characterized in that, it includes: an output shaft, a housing, a power output disc, internal and external gears, a shifting member, a transmission device, and a motor. The outer surface of the internal and external gears is provided with first external teeth, the inner surface of the internal and external gears is provided with internal teeth, the rear end of the output shaft is provided with second external teeth adapted to the internal teeth, the internal and external gears are located inside the housing, the rear end of the output shaft passes through the front end of the housing to be connected to the internal and external gears, the outer surface of the internal and external gears is further provided with a receiving groove, part of the shifting member is received in the receiving groove, the end of the shifting member extends outside the housing, the front end of the power output disc is provided with third external teeth adapted to the internal teeth, the shifting member can drive the internal and external gears to move axially up and down, the motor is arranged at the rear end of the housing, and the motor is connected to the rear end of the power output disc through the transmission device; It further includes a pawl and a left and right paddle. The pawl is connected to the first external teeth, the inner ends of the left and right paddles are connected to the pawl, and the outer ends of the left and right paddles extend outside the housing.

2. The electric screwdriver according to claim 1, characterized in that: The shifting member includes an arc-shaped member and two extension members. The two extension members are respectively arranged at both ends of the arc-shaped member. The arc-shaped member is received in the receiving groove, and the extension members extend outside the housing.

3. The electric screwdriver according to claim 2, characterized in that: The housing is provided with a vertical sliding groove corresponding to the extension member.

4. The electric screwdriver according to claim 3, characterized in that: It further includes a shifting outer shell arranged on the outer wall of the housing. The shifting outer shell is provided with two oblique sliding grooves corresponding to the two extension members. The outer ends of the extension members are located in the oblique sliding grooves. The shifting outer shell is further provided with a convex block. The oblique sliding groove includes a first horizontal part at the upper end, a second horizontal part at the lower end, and an oblique part in the middle.

5. The electric screwdriver according to claim 1, characterized in that: The transmission device includes a first gear, and the motor is connected to the rear end of the power output disc through the first gear.

6. The electric screwdriver according to claim 5, characterized in that: The transmission device further includes a second gear and a toothed disc. The rear end of the power output disc is provided with a first connecting column, the first gear is arranged on the first connecting column, the front end of the toothed disc is provided with a third gear, the first gear is connected to the third gear, the rear end of the toothed disc is provided with a second connecting column, the second gear is arranged on the second connecting column, and the second gear is connected to the motor teeth of the motor.

7. The electric screwdriver according to claim 6, characterized in that: The number of both the first gear and the second gear is multiple.

8. The electric screwdriver according to claim 1, characterized in that: A bearing is arranged on the output shaft.

9. The electric screwdriver according to claim 1, characterized in that: A motor plate is arranged at the rear end of the housing, and the motor is arranged on the motor plate.

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