Electric screwdriver

Abstract

The utility model relates to the field of electric tools, and particularly discloses an electric screwdriver which comprises a shell, a driving mechanism arranged in the shell, a driving shaft connected with the driving mechanism, a driving gear fixedly connected with the driving shaft and a rotating head installed on the shell and rotationally connected with the shell. A first connecting tooth part and a second connecting tooth part are arranged on the connector, when the central axis S1 of the output shaft is parallel to the central axis S2 of the driving gear, the driving gear is meshed with the first connecting tooth part, and the power torque of the driving gear is transmitted to the output shaft through the first connecting tooth part; when the rotating head rotates around the first axis S3 relative to the shell, the central axis S1 of the output shaft intersects with the central axis S2 of the driving gear, the driving gear is meshed with the second connection tooth part, and the power torque of the driving gear is transmitted to the output shaft through the second connection tooth part. The power output by the driving gear to the output shaft is stable and coherent.

Description

Technical Field

[0001] This utility model relates to the field of power tools, and in particular to an electric screwdriver. Background Technology

[0002] Screwdrivers, drills, and other rotary handheld power tools generally come in two forms: straight and angled, to suit different usage scenarios. In some cases, straight and angled tools need to be used alternately, which can affect normal work efficiency.

[0003] Based on an understanding of the relevant technologies, some handheld power tools have output shafts designed with a rotatable structure. The rotation angle of the output shaft can be set to multiple levels. However, the stability and continuity of the power output are crucial after the output shaft reaches the corresponding level at different angles. Although the output shaft of some handheld power tools can be adjusted, the stability and continuity of its power output are not good enough. Utility Model Content

[0004] The purpose of at least one specific embodiment of this utility model is to overcome the defects of the existing technology and provide an electric screwdriver.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An electric screwdriver, comprising:

[0007] case;

[0008] The drive mechanism is housed within the housing.

[0009] The drive shaft, whose rotational power is provided by the drive mechanism, has a drive gear at its end;

[0010] A rotating head, which is rotatably connected to the housing;

[0011] The rotating head is equipped with a connector, one side of which is connected to the output shaft and the other side is close to the drive gear;

[0012] The connector head is provided with a first connecting tooth portion and a second connecting tooth portion. When the central axis of the output shaft is parallel to the central axis of the drive gear, the drive gear meshes with the first connecting tooth portion, and the torque of the drive gear is transmitted to the output shaft through the first connecting tooth portion.

[0013] When the rotating head rotates relative to the housing around the first axis, the central axis of the output shaft intersects with the central axis of the drive gear, the drive gear meshes with the second connecting tooth part, and the torque of the drive gear is transmitted to the output shaft through the second connecting tooth part.

[0014] Furthermore, the first connecting tooth portion and the second connecting tooth portion are arranged circumferentially on the connecting head, and one end of the first connecting tooth portion is connected to one end of the second connecting tooth portion.

[0015] Furthermore, the first connecting tooth portion is straight, and when the rotation angle of the rotating head is 0°, the central axis of the output shaft is parallel to the central axis of the drive gear, and the front end of the drive gear meshes with at least the first connecting tooth portion.

[0016] Furthermore, the second connecting tooth is arc-shaped, with one end extending to the first connecting tooth and the other end extending to the circumferential surface of the connecting head. When the rotation angle of the rotating head is α°, the central axis of the output shaft intersects with the central axis of the drive gear, and the rear end of the drive gear meshes with at least the second connecting tooth, where 0 < α < 90°.

[0017] Furthermore, the rotating head is rotatably connected to the housing via a locking structure.

[0018] Furthermore, the locking structure includes:

[0019] The mounting part is fixed to one side of the housing;

[0020] The limiting part is fixed on the other side of the housing;

[0021] The pressing component is movably mounted on the mounting part and connected to the mounting part through an elastic component;

[0022] The locking element is movably mounted on the limiting part, and the locking element is connected to the pressing element via a connecting rod;

[0023] The rotating head has a first rotating part and a second rotating part on its two sides respectively. The first rotating part is sleeved on the outside of the limiting part and is locked to the limiting part by a locking member.

[0024] The second rotating part is sleeved on the outside of the mounting part. When the pressing part is pressed by external force, the pressing part drives the locking part to separate from the first rotating part through the connecting rod. The locking state between the first rotating part and the limiting part is released, and the rotating head can rotate relative to the housing.

[0025] When the external force on the pressing part disappears, the elastic element drives the pressing part to reset. The pressing part drives the locking part to approach the first rotating part through the connecting rod. The first rotating part and the limiting part are locked together by the locking part.

[0026] Furthermore, the inner side of the first rotating part is provided with multiple first linkage teeth, the inner side of the limiting part is provided with multiple second linkage teeth, and the outer side of the locking member is provided with multiple first locking teeth and second locking teeth.

[0027] When the pressing member drives the locking member to separate from the first rotating part through the connecting rod, the first locking tooth on the locking member separates from the first linkage tooth, the second locking tooth separates from the second linkage tooth, and the locking state between the first rotating part and the limiting part is released.

[0028] When the pressing member drives the locking member to approach the first rotating part via the connecting rod, the first locking tooth on the locking member engages with the first linkage tooth, and the second locking tooth engages with the second linkage tooth, thus locking the first rotating part and the limiting part together through the locking member.

[0029] Furthermore, the indexing between adjacent first linkage teeth, the indexing between adjacent second linkage teeth, the indexing between adjacent first locking teeth, and the indexing between adjacent second locking teeth are consistent;

[0030] The number of second linkage teeth on the limiting part is n, and the division value between adjacent second linkage teeth is 360° / n. When the rotating head rotates relative to the housing, different gears are formed when it rotates to different angles. The gear value of the rotating head is m, where m = 0, 1, 2, 3.... and the angle of rotation of the rotating head is α° = m × 360° / n.

[0031] Furthermore, the drive mechanism includes a drive motor installed in the housing and a gearbox connected to the output end of the drive motor, with the drive shaft connected to the power output end of the gearbox.

[0032] Furthermore, a power supply for supplying power to the drive mechanism is provided inside the housing.

[0033] The beneficial technical effects of the electric screwdriver provided in this application compared with the prior art are as follows: The electric screwdriver has a first connecting tooth portion and a second connecting tooth portion on its connecting head. When the central axis of the output shaft is parallel to the central axis of the drive gear, the drive gear meshes with the first connecting tooth portion, and the torque of the drive gear is transmitted to the output shaft through the first connecting tooth portion. At this time, the screwdriver is straight. When the rotating head rotates around the first axis relative to the housing, the central axis of the output shaft intersects with the central axis of the drive gear, and the drive gear meshes with the second connecting tooth portion. The torque of the drive gear is transmitted to the output shaft through the second connecting tooth portion. At this time, the screwdriver is angled. During the rotation of the rotating head, the drive gear is always meshed with the connecting tooth portion. Moreover, the drive gear can smoothly transition from the meshing state with the first connecting tooth portion to the meshing state with the second connecting tooth portion. During the transition of the screwdriver from straight to angled, the power output by the drive gear to the output shaft is stable and continuous. Attached Figure Description

[0034] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of an electric screwdriver in one embodiment of this application.

[0036] Figure 2 This is an exploded view of an electric screwdriver in one embodiment of this application.

[0037] Figure 3 This is a schematic diagram of the rotating head in one embodiment of this application.

[0038] Figure 4 for Figure 2 A schematic diagram of a local structure.

[0039] Figure 5 This is a cross-sectional schematic diagram of the electric screwdriver in a straight position according to one embodiment of this application.

[0040] Figure 6 This is a cross-sectional schematic diagram of an electric screwdriver in an angular position (output shaft angle setting is 22.5°) according to a certain embodiment of this application.

[0041] Figure 7 This is a cross-sectional schematic diagram of an electric screwdriver in an angular position (output shaft angle setting is 45°) according to a certain embodiment of this application.

[0042] Figure 8 This is a schematic diagram showing the fit between the drive gear and the connector in this application.

[0043] Figure 9 This is a schematic diagram of the assembly of the drive gear and the connecting head in this application. Detailed Implementation

[0044] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0045] Reference Figure 1 , Figure 2An electric screwdriver 100 includes a housing 10, a drive mechanism 20 disposed within the housing 10, a drive shaft 30 connected to the drive mechanism 20, a drive gear 40 fixedly connected to the drive shaft 30, and a rotating head 50 mounted on and rotatably connected to the housing 10.

[0046] The drive mechanism 20 includes a drive motor 201 installed in the housing 10 and a gearbox 202 connected to the output end of the drive motor 201. The drive shaft 30 is connected to the power output end of the gearbox 202. The housing 10 also includes a power supply 200, which is rechargeable and used to provide power to the drive motor 201.

[0047] In this embodiment, a connector 60 is fixedly installed inside the rotating head 50. One side of the connector 60 is connected to the output shaft 70, and the other side is close to the drive gear 40.

[0048] Reference Figure 8 , Figure 9 The connector 60 is provided with a first connecting tooth portion 601 and a second connecting tooth portion 602. When the central axis S1 of the output shaft 70 is parallel to the central axis S2 of the drive gear 40, the drive gear 40 meshes with the first connecting tooth portion 601, and the power torque of the drive gear 40 is transmitted to the output shaft through the first connecting tooth portion 601.

[0049] When the rotating head 50 rotates relative to the housing 10 around the first axis S3, the central axis S1 of the output shaft 70 intersects with the central axis S2 of the drive gear 40, and the drive gear 40 meshes with the second connecting tooth portion 602. The power torque of the drive gear 40 is transmitted to the output shaft 70 through the second connecting tooth portion 602.

[0050] In this embodiment, the first connecting tooth portion 601 and the second connecting tooth portion 602 are arranged circumferentially on the connector head 60, and one end of the first connecting tooth portion 601 is connected to one end of the second connecting tooth portion 602.

[0051] Furthermore, the first connecting tooth portion 601 is straight. When the rotation angle of the rotating head 50 is 0°, the central axis S1 of the output shaft 70 is parallel to the central axis S2 of the drive gear 40, and the front end 40a of the drive gear 40 meshes with the first connecting tooth portion 601 at least.

[0052] The second connecting tooth portion 602 is arc-shaped, with one end extending to the first connecting tooth portion 601 and the other end extending to the circumferential surface of the connecting head 60. When the rotation angle of the rotating head 50 is α°, the central axis of the output shaft 70 intersects with the central axis of the drive gear 40, and the rear end 40b of the drive gear 40 meshes with at least the second connecting tooth portion 602, wherein 0 < α < 90°.

[0053] Furthermore, refer to Figures 2 to 5 The rotating head 50 is rotatably connected to the housing 10 via a locking structure 80. The locking structure 80 includes a mounting portion 801 fixed to one side of the housing 10, a limiting portion 802 fixed to the other side of the housing 10, a pressing member 803 movably disposed on the mounting portion 801, and a locking member 804 movably disposed on the limiting portion 802. The pressing member 803 is connected to the mounting portion 801 via an elastic member 805, preferably a spring. The pressing member 803 is connected to the locking member 804 via a connecting rod 806, which passes through the rotating head 50. The mounting portion 801 and the limiting portion 802 are constructed as part of the housing 10.

[0054] The rotating head 50 has a first rotating part 501 and a second rotating part 502 on both sides. The first rotating part 501 is sleeved on the outside of the limiting part 802 and is locked to the limiting part 802 by the locking member 804.

[0055] The second rotating part 502 is sleeved on the outside of the mounting part 801. When the pressing member 803 is pressed by external force, the elastic member 805 is compressed. The pressing member 803 drives the locking member 804 to separate from the first rotating part 501 through the connecting rod 806. The locking state between the first rotating part 501 and the limiting part 802 is released, and the rotating head 50 can rotate relative to the housing 10.

[0056] When the external force on the pressing member 803 disappears, the elastic member 805 drives the pressing member 803 to reset. The pressing member 803 drives the locking member 804 to approach the first rotating part 501 through the connecting rod 806. The first rotating part 501 and the limiting part 802 are locked together by the locking member 804.

[0057] Furthermore, the inner side of the first rotating part 501 is provided with a plurality of first linkage teeth 501a, the inner side of the limiting part 802 is provided with a plurality of second linkage teeth 802a, and the outer side of the locking member 804 is provided with a plurality of first locking teeth 804a and second locking teeth 804b.

[0058] When the pressing member 803 drives the locking member 804 to separate from the first rotating part 501 via the connecting rod 806, the first locking tooth 804a on the locking member 804 separates from the first linkage tooth 501a, the second locking tooth 804b separates from the second linkage tooth 802a, and the locking state of the first rotating part 501 and the limiting part 802 is released.

[0059] When the pressing member 803 drives the locking member 804 to approach the first rotating part 501 via the connecting rod 806, the first locking tooth 804a on the locking member 804 engages with the first linkage tooth 501a, and the second locking tooth 804b engages with the second linkage tooth 802a. The first rotating part 501 and the limiting part 802 are locked together by the locking member 804.

[0060] Furthermore, the indexing between adjacent first linkage teeth 501a, the indexing between adjacent second linkage teeth 802a, the indexing between adjacent first locking teeth 804a, and the indexing between adjacent second locking teeth 804b are consistent.

[0061] The number of second linkage teeth 802a on the limiting part 802 is n, and the division value between adjacent second linkage teeth 802a is 360° / n. When the rotating head 50 rotates relative to the housing 10, different gears are formed when it rotates to different angles. The gear value of the rotating head 50 is m, where m = 0, 1, 2, 3.... and the angle of rotation of the rotating head 50 is α° = m × 360° / n.

[0062] In this embodiment, there are 16 second linkage teeth 802a, and the division value between adjacent second linkage teeth 802a is 22.5°. Similarly, the division value between adjacent first linkage teeth 501a, the division value between adjacent first locking teeth 804a, and the division value between adjacent second locking teeth 804b are all 22.5°. That is to say, after the locking state of the rotating head 50 relative to the housing 10 is released, although the rotating head 50 can rotate continuously, when the rotating head 50 rotates to a stable position and is locked by the locking structure 80, the angle of a single rotation of the rotating head 50 is at least 22.5°. During the rotation of the rotating head 50, the angle difference of the rotating head 50 between adjacent positions is 22.5°.

[0063] When m = 0, the rotation position of the rotating head 50 is 0. At this time, the rotation angle α° of the rotating head 50 is 0°. The central axis S1 of the output shaft 70 at the end of the rotating head 50 is parallel to the central axis S2 of the drive gear 40. The electric screwdriver 100 is straight. It should be noted that at this time, the rotating head 50 is fixed to the housing 10 by the locking structure 80. Before pressing the locking structure 80, the output shaft 70 and the rotating head 50 cannot rotate relative to the housing 10 around the first axis S3.

[0064] When m=1, the rotation gear value of the rotating head 50 is 1, and the rotation angle α° of the rotating head 50 is 22.5°. At this time, the central axis of the output shaft 70 intersects with the central axis of the drive gear 40. The output shaft 70 rotates 22.5° relative to the central axis of the drive gear 40. During the rotation, the drive gear 40 is always engaged with the connecting tooth portion 602. Specifically, the rear end 40b of the drive gear 40 is engaged with at least the second connecting tooth portion 602. The electric screwdriver 100 is angular.

[0065] When m=2, the rotation gear value of the rotating head 50 is 2, and the rotation angle α°=45° of the rotating head 50 is 45°. At this time, the central axis of the output shaft 70 intersects with the central axis of the drive gear 40. The output shaft 70 rotates 45° relative to the central axis of the drive gear 40. During the rotation, the drive gear 40 is always engaged with the connecting tooth 602. Specifically, the rear end 40b of the drive gear 40 can at least still engage with the second connecting tooth 602. The electric screwdriver 100 is also angular.

[0066] Of course, when m=3, the gear value of the rotating head 50 is 3, and the rotation angle α° of the rotating head 50 is 67.5°. At this time, the central axis of the output shaft 70 intersects with the central axis of the drive gear 40. The output shaft 70 rotates 67.5° relative to the central axis of the drive gear 40. During the rotation of the drive gear 40, the rear end 40b of the drive gear 40 may still mesh with the second connecting tooth 602. The electric screwdriver 100 is also angular.

[0067] As the value of m gradually increases, the number of shiftable gears of the electric screwdriver 100 increases, the rotation angle of the output shaft 70 relative to the central axis of the drive gear 40 increases, and the meshing requirements between the drive gear 40 and the second connecting tooth portion 602 also increase. According to the design of the second connecting tooth portion 602 and the drive gear 40 in this application, the electric screwdriver 100 of this application can be set to three gears. That is, when the gear value m = 0, the electric screwdriver 100 is straight; when the gear value m = 1, the electric screwdriver 100 is angled and the angle of the output shaft 70 is 22.5°; when the gear value m = 2, the electric screwdriver 100 is angled and the angle of the output shaft 70 is 45°.

[0068] Reference Figure 3 , Figure 6 , Figure 7 During operation, the electric screwdriver 100 of this application can adjust the rotation angle of the rotating head 50. Under normal circumstances, the rotation angle of the rotating head 50 is 0°. At this time, the rotation gear value m of the rotating head 50 is 0. The central axis S1 of the output shaft 70 at the end of the rotating head 50 is parallel to the central axis S2 of the drive gear 40. Moreover, the drive gear 40 extends into the inner side of the connector 60. The front end 40a of the drive gear 40 is at least engaged with the first connecting tooth portion 601. The power generated by the drive motor 201 is transmitted to the drive gear 40 through the gearbox 202. The drive gear 40 is transmitted to the output shaft 70 through the connector 60. At this time, the electric screwdriver 100 is straight.

[0069] When the electric screwdriver 100 needs to be converted to an angle type in the working environment, the rotation angle of the rotating head 50 needs to be adjusted. When adjusting the angle of the rotating head 50, the operator presses the pressing part 803, compressing the elastic element 805 on the inner side of the pressing part 803. The pressing part 803, through the connecting rod 806, causes the locking part 804 to separate from the first rotating part 501. Specifically, the first locking tooth 804a on the locking part 804 separates from the first linkage tooth 501a on the first rotating part 501, and the second locking tooth 804b on the locking part 804 separates from the second linkage tooth 802a on the limiting part 802. At this time, the locking state formed by the first rotating part 501 and the limiting part 802 is released, and the rotating head 50 can rotate relative to the housing 10. The corresponding output shaft 70 rotates relative to the central axis of the drive gear 40. When the angle setting of the output shaft 70 is 22.5°... When the user releases the pressing part 803, the elastic part 805 drives the pressing part 803 to reset. The pressing part 803 drives the locking part 804 to approach the first rotating part 501 through the connecting rod 806. The first locking tooth 804a on the locking part 804 meshes with the first linkage tooth 501a on the first rotating part 501, and the second locking tooth 804b on the locking part 804 meshes with the second linkage tooth 802a on the limiting part 802. At this time, the first rotating part 501 and the limiting part 802 are locked by the locking part 804. The output shaft 70, which has rotated to an angle of 22.5°, is in a stable locked state. The power generated by the drive motor 201 is transmitted to the drive gear 40 through the gearbox 202. The drive gear 40 is transmitted to the output shaft 70 through the connector 60. At this time, the electric screwdriver 100 is angled, and the output shaft 70 can meet the requirements of the variable output transmission torque.

[0070] Similarly, when the hand presses the pressing part 803 again, the locking state formed by the first rotating part 501 and the limiting part 802 is released, and the rotating head 50 can rotate relative to the housing 10. The corresponding output shaft 70 rotates relative to the central axis of the drive gear 40. When the angle setting of the output shaft 70 is 45°, the hand releases the pressing part 803, and the first rotating part 501 and the limiting part 802 are locked by the locking part 804. The output shaft 70, which has rotated to a 45° angle, is in a stable locked state. The power generated by the drive motor 201 is transmitted to the drive gear 40 through the gearbox 202. The drive gear 40 is transmitted to the output shaft 70 through the connector 60. At this time, the electric screwdriver 100 is angled, and the output shaft 70 can meet the requirements of large-angle variable output transmission torque.

[0071] During the rotation of the rotating head 50 of this application, the drive gear 50 is always engaged with the connecting tooth portion. Moreover, the drive gear 50 can smoothly transition from the engagement state with the first connecting tooth portion 601 to the engagement state with the second connecting tooth portion 602. During the transition of the screwdriver from a straight shape to an angle shape, the power output by the drive gear 40 to the output shaft 70 is stable and continuous.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An electric screwdriver, comprising: case; The drive mechanism is disposed within the housing; The drive shaft, whose rotational power is provided by the drive mechanism, has a drive gear at its end; A rotating head, which is rotatably connected to the housing; The rotating head is characterized by having a connecting head inside, one side of which is connected to the output shaft, and the other side is close to the drive gear; The connector head is provided with a first connecting tooth portion and a second connecting tooth portion. When the central axis of the output shaft is parallel to the central axis of the drive gear, the drive gear meshes with the first connecting tooth portion, and the power torque of the drive gear is transmitted to the output shaft through the first connecting tooth portion. When the rotating head rotates relative to the housing about the first axis, the central axis of the output shaft intersects with the central axis of the drive gear, the drive gear meshes with the second connecting tooth portion, and the power torque of the drive gear is transmitted to the output shaft through the second connecting tooth portion.

2. The electric screwdriver according to claim 1, characterized in that The first connecting tooth portion and the second connecting tooth portion are arranged circumferentially on the connecting head, and one end of the first connecting tooth portion is connected to one end of the second connecting tooth portion.

3. The electric screwdriver according to claim 1, characterized in that The first connecting tooth portion is straight. When the rotation angle of the rotating head is 0°, the central axis of the output shaft is parallel to the central axis of the drive gear, and the front end of the drive gear meshes with at least the first connecting tooth portion.

4. The electric screwdriver according to claim 3, characterized in that The second connecting tooth is arc-shaped, with one end extending to the first connecting tooth and the other end extending to the circumferential surface of the connecting head. When the rotation angle of the rotating head is α°, the central axis of the output shaft intersects with the central axis of the drive gear, and the rear end of the drive gear meshes with at least the second connecting tooth, wherein 0 < α < 90°.

5. The electric screwdriver according to any one of claims 1 to 3, characterized in that, The rotating head is rotatably connected to the housing via a locking structure.

6. The electric screwdriver according to claim 5, characterized in that The locking structure includes: The mounting part is fixed to one side of the housing; A limiting part is fixed to the other side of the housing; The pressing element is movably disposed on the mounting part and connected to the mounting part via an elastic element; A locking element is movably disposed on the limiting part, and the locking element is connected to the pressing element via a connecting rod; The rotating head is provided with a first rotating part and a second rotating part on both sides, the first rotating part is sleeved on the outside of the limiting part and locked to the limiting part by the locking member; The second rotating part is sleeved on the outside of the mounting part. When the pressing member is pressed by an external force, the pressing member drives the locking member to separate from the first rotating part through the connecting rod. The locking state of the first rotating part and the limiting part is released, and the rotating head can rotate relative to the housing. When the external force on the pressing member disappears, the elastic member drives the pressing member to reset, and the pressing member drives the locking member to approach the first rotating part through the connecting rod. The first rotating part and the limiting part are locked together by the locking member.

7. The electric screwdriver according to claim 6, characterized in that The inner side of the first rotating part is provided with a plurality of first linkage teeth, the inner side of the limiting part is provided with a plurality of second linkage teeth, and the outer side of the locking member is provided with a plurality of first locking teeth and second locking teeth. When the pressing member drives the locking member to separate from the first rotating part through the connecting rod, the first locking tooth on the locking member separates from the first linkage tooth, the second locking tooth separates from the second linkage tooth, and the locking state between the first rotating part and the limiting part is released; When the pressing member drives the locking member to approach the first rotating part through the connecting rod, the first locking tooth on the locking member engages with the first linkage tooth, and the second locking tooth engages with the second linkage tooth, and the first rotating part and the limiting part are locked together by the locking member.

8. The electric screwdriver according to claim 7, characterized in that, The indexing between adjacent first linkage teeth, the indexing between adjacent second linkage teeth, the indexing between adjacent first locking teeth, and the indexing between adjacent second locking teeth are consistent; The number of second linkage teeth on the limiting part is n, and the division value between adjacent second linkage teeth is 360° / n. When the rotating head rotates relative to the housing, different gears are formed when it rotates to different angles. The gear value of the rotating head is m, where m = 0, 1, 2, 3.... and the angle of rotation of the rotating head is α° = m × 360° / n.

9. The electric screwdriver according to claim 1, characterized in that The drive mechanism includes a drive motor installed in the housing and a gearbox connected to the output end of the drive motor, and the drive shaft is connected to the power output end of the gearbox.

10. The electric screwdriver according to claim 1, characterized in that The housing contains a power supply for supplying power to the drive mechanism.

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