Electrician's drill

Abstract

The present application provides a kind of electric screwdriver, it includes shell, output device, electric screwdriver head device and transmission device.Output device is arranged in the top end inside shell, and the bottom end of output device is provided with motor shaft;Electric screwdriver head device includes bit holder;Bit holder is rotatably connected with shell, and bit holder is located below motor shaft, and the bottom end of bit holder extends out the bottom end of shell;Transmission device is arranged inside shell, and transmission device connects motor shaft with bit holder.Electric screwdriver head device includes bit holder, bit body and fastening assembly.Electric screwdriver drives bit holder to rotate by output device, and bit holder is rotatably connected with shell, and bit body is inserted with bit mounting slot, and it is convenient to replace different models of bit body, so as to disassemble and assemble different screws;Fastening assembly connects bit holder with bit body, and fastening assembly is convenient for bit body and bit holder to be quickly disassembled, and improve the stability of bit body and bit holder connection, improve the stability and practicality of electric screwdriver structure during use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric screwdrivers, in particular to an electric screwdriver. BACKGROUND

[0002] Electric screwdrivers are also called electric screwdrivers or electric screwdrivers. They are electric tools used for tightening and loosening screws and nuts, and are essential tools in the assembly industry.

[0003] The existing electric screwdriver bit structure is an interference fit structure of the bit and the bit seat. When replacing the bit, it needs to be inserted and pulled out with great force, which is not only inconvenient for replacing the bit, but also the interference fit bit and bit seat are worn out after long-term insertion and pulling, and the bit is prone to falling off during use, resulting in poor stability of the electric screwdriver.

[0004] Therefore, an electric screwdriver is needed to solve the above technical problems. SUMMARY

[0005] The present application provides an electric screwdriver to solve the problem of wear and tear of the bit and the bit seat of the electric screwdriver in the prior art, and the poor stability of the electric screwdriver as a whole.

[0006] To solve the above technical problems, the technical scheme of the present application is as follows: an electric screwdriver, comprising:

[0007] a housing;

[0008] an output device arranged in the housing, the output device comprising a motor shaft;

[0009] an electric bit device connected to the housing, the electric bit device being located below the output device; and

[0010] a transmission device arranged in the housing, the transmission device comprising a shaft coupling, the shaft coupling connecting the motor shaft and the electric bit device;

[0011] wherein the electric bit device comprises:

[0012] a bit seat in the form of a vertically arranged column, the top of the bit seat being connected to the transmission device, and the bottom end of the bit seat being provided with a mounting groove;

[0013] a bit body inserted into the mounting groove; and

[0014] a fastening assembly connecting the bit seat and the bit body.

[0015] In the present application, the bit seat side is provided with a positioning hole, the positioning hole penetrates the side wall of the bit seat and communicates with the mounting groove;

[0016] The side of the batch head body is provided with a first positioning groove;

[0017] The fastening assembly comprises:

[0018] A positioning sleeve is sleeved on the outer ring of the batch head seat, and a second positioning groove is arranged on the inner side of the positioning sleeve; and

[0019] A positioning bead is movably arranged in the positioning hole, and the cross-sectional width of the positioning bead is greater than the length of the positioning hole.

[0020] In the present application, the movement track of the batch head body relative to the batch head seat comprises a fixed position and a movable position, and the fixed position is above the movable position.

[0021] When the batch head body is located at the fixed position, the positioning bead is engaged with the first positioning groove, and the inner wall of the positioning sleeve closes the outer side of the positioning hole.

[0022] When the batch head body is located at the movable position, the positioning bead is engaged with the second positioning groove, and the outer side of the batch head body closes the inner side of the positioning hole.

[0023] In the present application, the fastening assembly further comprises:

[0024] A first limiting ring is connected to the outer side of the batch head seat, the first limiting ring is located below the positioning hole, and the first limiting ring is used to limit the position of the positioning sleeve.

[0025] A second limiting ring is connected to the outer side of the batch head seat, the second limiting ring is located above the positioning hole, and the second limiting ring is located above the positioning sleeve.

[0026] A first elastic member connects the first limiting ring and the positioning sleeve, and the first elastic member elastically extrudes the contact between the positioning sleeve and the first limiting ring.

[0027] In the present application, the top of the shaft coupling is provided with a motor connecting groove, and the motor connecting groove is inserted with the motor shaft.

[0028] The top of the shaft coupling is provided with a batch head connecting groove, and the batch head connecting groove is inserted with the batch head seat.

[0029] In the present application, the motor shaft comprises a motor connecting portion inserted with the motor connecting groove, the cross section of the motor connecting portion is an ellipse or a polygon, and the cross section of the motor connecting groove matches the cross section of the motor connecting portion.

[0030] The coupling is internally provided with a first motor positioning block, the first motor positioning block is located in the motor connecting groove, the motor shaft side is provided with a first motor positioning groove, and the first motor positioning block is clamped with the first motor positioning groove.

[0031] The coupling is internally provided with a second motor positioning groove, the second motor positioning groove is communicated with the motor connecting groove, the motor shaft is externally provided with a second motor positioning block, and the second motor positioning block is clamped with the second motor positioning groove.

[0032] The coupling is externally provided with a fifth limiting ring, the batch head seat is externally provided with a fourth limiting ring, and the transmission device further comprises:

[0033] A first plane bearing is connected with the inner wall of the shell, the coupling is inserted with the inner ring of the first plane bearing, and the first limiting ring is located below the first plane bearing;

[0034] A second plane bearing is connected with the shell, the batch head seat is inserted with the second plane bearing, and the second limiting ring is located above the second plane bearing; and

[0035] A second elastic member is connected with the first limiting ring at the top end, and the bottom end of the second elastic member is connected with the second limiting ring.

[0036] The electric batch head device is located on one side of the output device, the output device comprises a motor shaft, and the electric batch head device comprises a batch head seat; the transmission device comprises:

[0037] A fixed seat is located between the output device and the electric batch head device, and the fixed seat is rotationally connected with the batch head seat;

[0038] A first mounting sleeve is used for connecting the output device, and the output device comprises a motor shaft;

[0039] A first gear assembly is rotationally connected with the fixed seat, the central axis of the first gear assembly extends in a direction perpendicular to the plane where the fixed seat is located, and the first gear assembly is connected with the motor shaft; and

[0040] A second gear assembly is rotationally connected with the fixed seat, and the central axis of the second gear assembly extends in a direction perpendicular to the plane where the fixed seat is located.

[0041] The first gear assembly is engaged with the second gear assembly.

[0042] Compared to existing technologies, the advantages of this invention are as follows: The electric screwdriver of this invention drives the bit holder to rotate via an output device. The bit holder is rotatably connected to the outer casing, and a bit mounting groove is provided at the bottom of the bit holder. The bit body is inserted into the bit mounting groove, facilitating the replacement of different bit bodies for disassembling and assembling different screws. A fastening component connects the bit holder and the bit body, enabling quick disassembly and assembly of the bit body and bit holder, and improving the stability of the connection between the bit body and bit holder. In this invention, the fastening component facilitates quick disassembly and assembly of the bit body and bit holder, and improves the stability of the connection between the bit body and bit holder. When the positioning bead engages with the first positioning groove, the positioning sleeve limits the position of the positioning bead, improving the stability of the engagement between the bit body and the positioning hole. This avoids the wear and tear caused by the traditional electric screwdriver's long-term plugging and unplugging connection between the bit body and bit holder, as well as the problem of the bit body easily loosening and falling off. This improves the stability of the electric screwdriver structure during use, making the structure highly practical. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments are briefly introduced below. The drawings described below are only the corresponding drawings of some embodiments of the present invention.

[0044] Figure 1 This is a schematic cross-sectional view of the overall structure of the first embodiment of the electric screwdriver of the present invention.

[0045] Figure 2 This is a schematic diagram of the fastening assembly structure located in the fixed position in the first embodiment of the electric screwdriver of the present invention.

[0046] Figure 3 This is a schematic diagram of the fastening assembly structure located in the movable position of the first embodiment of the electric screwdriver of the present invention.

[0047] Figure 4 This is an exploded view of the transmission device structure of the first embodiment of the electric screwdriver of the present invention.

[0048] Figure 5 This is a schematic cross-sectional view of the coupling in the first embodiment of the electric screwdriver of the present invention.

[0049] Figure 6 This is a cross-sectional schematic diagram of the transmission device of the first embodiment of the electric screwdriver of the present invention.

[0050] Figure 7 This is an exploded view of the casing of the first embodiment of the electric screwdriver of the present invention.

[0051] Figure 8 This is a cross-sectional schematic diagram of the transmission device in a second embodiment of the electric screwdriver of the present invention.

[0052] Figure 9Exploded view of the coupling of the second embodiment of the electric driver of the present application and the motor shaft.

[0053] Figure 10 Overall structure sectional view of the third embodiment of the electric driver of the present application.

[0054] Figure 11 Overall structure schematic view of the fourth embodiment of the electric driver of the present application.

[0055] Figure 12 Partial structure exploded view of the fourth embodiment of the electric driver of the present application.

[0056] Figure 13 Overall structure sectional view of the fifth embodiment of the electric driver of the present application.

[0057] Figure 14 Transmission structure view of the fifth embodiment of the electric driver of the present application.

[0058] Figure 15 Transmission exploded view of the fifth embodiment of the electric driver of the present application.

[0059] Figure 16 Transmission longitudinal sectional view of the fifth embodiment of the electric driver of the present application.

[0060] Figure 17 Transmission transversal sectional view of the fifth embodiment of the electric driver of the present application.

[0061] First embodiment reference numerals: 11, housing; 111, shell; 112, sealing cover; 1121, third receiving groove; 1122, fourth receiving groove; 1123, second positioning ring; 12, output device; 121, motor shaft; 1211, motor connecting part; 13, electric screwdriver head device; 131, head seat; 13, electric screwdriver head device; 131, head seat; 1311, head mounting groove; 1312, positioning hole; 1313, fifth positioning groove; 1314, head connecting part; 1315, sixth limiting ring; 132, head body; 1321, first positioning groove; 133, fastening assembly; 1331, positioning sleeve; 13311, second positioning groove; 13312, third positioning groove; 13313, fourth positioning groove; 13314, stripe groove; 13315, limiting section; 13316, receiving section; 13317, first guide section; 1332, positioning bead; 1333, first limiting ring; 1334, second limiting ring; 1335, first elastic member; 1336, first positioning ring; 14, transmission device; 141, shaft coupling; 1411, motor connecting groove; 142, bearing seat; 1421, first mounting section; 14211, flange mounting groove; 14212, flange positioning groove; 1422, connecting section; 1423, second mounting section; 14231, first receiving groove; 14232, second receiving groove; 1424, third limiting ring; 143, mounting flange; 1431, connecting ring; 1432, connecting sleeve; 144, first bearing; 145, second bearing.

[0062] Second embodiment reference numerals: 21, housing; 22, output device; 221, motor shaft; 2211, first motor positioning groove; 23, electric screwdriver head device; 231, head seat; 2311, first head positioning groove; 24, transmission device; 241, shaft coupling; 2411, first motor positioning block; 2412, first head positioning block.

[0063] Third embodiment reference numerals: 31, housing; 32, output device; 321, motor shaft; 3211, second motor positioning block; 33, electric screwdriver head device; 331, head seat; 3311, second head positioning block; 34, transmission device; 341, shaft coupling; 3411, second motor positioning groove; 3412, second head positioning groove.

[0064] Fourth embodiment reference numerals: 41, housing; 411, upper housing; 412, lower housing; 4121, clamping groove; 4122, flange positioning groove; 413, mounting flange; 4131, connecting ring; 4132, connecting sleeve; 4133, flange positioning column; 414, sealing cover; 4141, plug-in section; 4142, fixed section; 41421, clamping ring; 43, electric screwdriver head device; 431, head seat; 4312, fourth limiting ring; 432, head body; 433, fastening assembly; 44, transmission device; 441, shaft coupling; 4413, fifth limiting ring; 442, first plane bearing; 443, second plane bearing; 444, second elastic member.

[0065] Fifth embodiment reference numerals: 51, housing; 52, output device; 521, motor shaft; 5211, output limiting ring; 53, electric screwdriver head device; 531, head seat; 5311, plug-in section; 5312, first limiting section; 5313, second limiting section; 532, head body; 533, fastening assembly; 54, transmission device; 541, fixed seat; 5411, upper cover; 5412, lower cover; 54121, second fixed groove; 54122, second positioning groove; 542, first mounting sleeve; 543, first gear assembly; 5431, first gear ring; 5432, first upper bearing; 5433, first lower bearing; 544, second gear assembly; 5441, second gear ring; 5442, second upper bearing; 5443, second lower bearing; 545, intermediate gear assembly; 546, second mounting sleeve. DETAILED DESCRIPTION

[0066] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0067] In the drawings: similar elements are denoted by the same reference numerals throughout the various figures. In the description of the application, it is to be understood that the terminology "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like are used to indicate the orientation or positional relationship of the apparatus or elements shown in the drawings, and are merely intended to facilitate the description of the application and simplify the description, and are not intended to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the application. In addition, features defined with "first", "second" can be explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0068] In the description of the application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0069] Please refer to Figure 1 , Figure 2 and Figure 3 , wherein Figure 1 is the overall structure of the preferred embodiment of the application Figure 1 . Figure 2 is the overall structure of the preferred embodiment of the application Figure 2 . Figure 3 is the overall structure of the preferred embodiment of the application Figure 3 .

[0070] The following is a preferred embodiment of an electric screwdriver provided by the application which can solve the above technical problems.

[0071] The preferred embodiment of the electric screwdriver provided by the application is: an electric screwdriver comprising a housing 11, an output device 12, a screwdriver head device 13, and a transmission device 14. The output device 12 is arranged at the top end inside the housing 11, and the bottom end of the output device 12 is provided with a motor shaft 121; the screwdriver head device 13 comprises a bit holder 131; the bit holder 131 is rotatably connected with the housing 11, the bit holder 131 is located below the motor shaft 121, and the bottom end of the bit holder 131 extends out of the bottom end of the housing 11; the transmission device 14 is arranged inside the housing 11, and the transmission device 14 connects the motor shaft 121 and the bit holder 131, so as to transmit power.

[0072] The electric bit head device 13 comprises a bit head seat 131, a bit head body 132, and a fastening assembly 133; the bottom end of the bit head seat 131 is provided with a bit head mounting groove 1311, and the side edge of the bit head seat 131 is provided with a positioning hole 1312 which penetrates through the side wall of the bit head seat 131 and communicates with the bit head mounting groove 1311; the bit head body 132 is inserted into the bit head mounting groove 1311, and the side edge of the bit head body 132 is provided with a first positioning groove 1321; the fastening assembly 133 connects the bit head seat 131 and the bit head body 132; wherein the bit head seat 131 is a columnar structure arranged vertically, the top of the bit head seat 131 is connected with the output device, and the bottom end of the bit head seat 131 is provided with the bit head mounting groove 1311; the bit head body 132 is inserted into the bit head mounting groove 1311, which facilitates replacement of bit head bodies 132 of different models, so as to disassemble and assemble different screws; the fastening assembly 133 connects the bit head seat 131 and the bit head body 132, which facilitates quick disassembly and assembly of the bit head body 132 and the bit head seat 131 and improves the stability of the connection between the bit head body 132 and the bit head seat 131.

[0073] In combination with Figure 2 And Figure 3 The electric bit head device 13 in the embodiment is described in detail as follows:

[0074] The side edge of the bit head seat 131 in the embodiment is provided with the positioning hole 1312 which penetrates through the side wall of the bit head seat 131 and communicates with the bit head mounting groove 1311; the side edge of the bit head body 132 is provided with the first positioning groove 1321 which corresponds in position to the positioning hole 1312.

[0075] The fastening assembly 133 in the embodiment comprises a positioning sleeve 1331 and a positioning bead 1332; the positioning sleeve 1331 is sleeved on the outer circle of the bit head seat 131, and the inner side of the positioning sleeve 1331 is provided with a second positioning groove 13311; the positioning bead 1332 is movably arranged in the positioning hole 1312, and the cross-sectional width of the positioning bead 1332 is greater than the length of the positioning hole 1312. The positioning sleeve 1331 in the embodiment can be made of damping rubber material.

[0076] The positioning sleeve 1331 can be elastically sleeved on the outer circle of the bit head seat 131, and when the positioning bead 1332 is clamped with the first positioning groove 1321, the positioning sleeve 1331 limits the position of the positioning bead 1332, improves the stability of the clamping of the bit head body 132 and the positioning hole 1312, avoids the problems of wear and tear and easy loosening and falling of the bit head body 132 caused by long-term plug-in connection of the bit head body 132 and the bit head seat 131 in traditional electric bit head devices, and has strong structural practicability.

[0077] In combination with Figure 3 And Figure 4The electric bit head device 13 in the embodiment will be described in detail as follows:

[0078] In the embodiment, the movement track of the positioning bead 1332 along the straight line where the extending direction of the positioning hole 1312 is located includes a fixed position and a movable position, and the fixed position is located outside the movable position. When the positioning bead 1332 is located at the fixed position, the positioning bead 1332 is clamped with the second motor positioning groove 3411, and the inner wall of the positioning sleeve 1331 is closed outside the positioning hole 1312, thereby improving the stability of the connection between the bit body 132 and the bit seat 131.

[0079] When the positioning bead 1332 is located at the movable position, the positioning bead 1332 is clamped with the second positioning groove 13311, and the outer side of the bit body 132 is closed inside the positioning hole 1312, thereby facilitating the plugging operation of the bit body 132 from the bit mounting groove 1311 and facilitating the replacement of different models of the bit body 132.

[0080] In the embodiment, the fastening assembly 133 further includes a first limiting ring 1333, a second limiting ring 1334, and a first elastic member 1335. The first limiting ring 1333 is connected to the outer side of the bit seat 131 and is located below the positioning hole 1312. The first limiting ring 1333 is used to limit the position of the positioning sleeve 1331 to avoid the positioning sleeve 1331 from falling off the bit seat 131. The second limiting ring 1334 is connected to the outer side of the bit seat 131 and is located above the positioning hole 1312 and above the positioning sleeve 1331. The first elastic member 1335 connects the first limiting ring 1333 and the positioning sleeve 1331. The first elastic member 1335 elastically extrudes the positioning sleeve 1331 to contact the first limiting ring 1333, so that the positioning bead 1332 is kept in the fixed position state, thereby avoiding the loosening of the positioning sleeve 1331 due to the vibration of the electric bit during use. The structure has high practicability and improves the stability of the electric bit head device 13 during use.

[0081] The structure of the positioning sleeve 1331 in the embodiment will be described.

[0082] The top end of the positioning sleeve 1331 in the embodiment is provided with a third positioning groove 13312, and the third positioning groove 13312 is connected to the bottom end of the first elastic member 1335. The third positioning groove 13312 limits the position of the first elastic member 1335, thereby improving the stability of the connection between the first elastic member 1335 and the positioning sleeve 1331.

[0083] The outer side of the positioning sleeve 1331 in the embodiment is further provided with a striped groove 13314. The striped groove 13314 increases the roughness of the surface of the positioning sleeve 1331, thereby facilitating the adjustment and use of the user.

[0084] The positioning sleeve 1331 in the embodiment comprises, from top to bottom, a limiting section 13315, a receiving section 13316, and a first guide section; the limiting section 13315 is located at the top end of the positioning sleeve 1331, the inner side of the limiting section 13315 is attached to the outer side of the bit holder 131, the limiting section 13315 is used to close the positioning hole 1312 and to push the position of the positioning bead 1332; the receiving section 13316 is located below the limiting section 13315, the second positioning groove 13311 is located in the receiving section 13316, and the positioning sleeve 1331 is pushed upward so that the positioning bead 1332 can be accommodated in the second positioning groove 13311 when the bit body 132 is disassembled. The top end of the first guide section is connected to the limiting end, and the bottom end of the first guide section is connected to the receiving section 13316.

[0085] The inner wall cross-sectional diameter of the receiving section 13316 is greater than the inner wall cross-sectional diameter of the limiting end, and the inner wall cross-sectional diameter of the first guide section gradually increases from top to bottom. The first guide section guides the movement of the positioning bead 1332 relative to the positioning sleeve 1331, reduces the wear of the fixing device, and prolongs the service life of the structure.

[0086] The bottom end of the positioning sleeve 1331 in the embodiment is provided with a fourth positioning groove 13313, which is used to limit the position of the first limiting ring 1333. When the bit body 132 is located in the fixed position, the first limiting ring 1333 is clamped with the fourth positioning groove 13313, the structure is compact, the volume of the electric bit device 13 is reduced, and the use is facilitated.

[0087] Further, the outer circle of the clamping seat in the embodiment is also provided with a fifth positioning groove 1313, which is located below the positioning hole 1312; the fastening assembly 133 further comprises a first positioning ring 1336, which is clamped with the fifth positioning groove 1313, the first positioning ring 1336 limits the position of the first limiting ring 1333, and the stability of the clamping of the first positioning ring 1336 and the positioning sleeve 1331 is improved.

[0088] Further, the first positioning ring 1336 in the embodiment is an open metal ring structure, which is convenient for production and installation, and the metal ring structure has high hardness and is not easy to wear, and the structure has strong practicality.

[0089] In combination with Figure 3 and Figure 4 , the working principle of the electric bit device 13 of the present application is as follows:

[0090] When the user needs to install the bit body 132: first, push the positioning sleeve 1331 upwards, so that the second positioning groove 13311 inside the positioning sleeve 1331 corresponds to the positioning hole 1312; second, take out the bit body 132 and insert it into the bit mounting groove, the side wall of the bit body 132 will extrude the positioning bead 1332 and the second positioning groove 13311 to be clamped; then, after the bit body 132 is inserted into place, the first positioning groove 1321 corresponds to the positioning hole 1312, the positioning sleeve 1331 is loosened, the first elastic member 1335 elastically drives the positioning sleeve 1331 to reset, the positioning sleeve 1331 extrudes the positioning bead 1332 to move along the extension direction of the positioning hole 1312, so that the positioning bead 1332 is clamped with the first positioning groove 1321. Finally, the first elastic member 1335 elastically extrudes the positioning sleeve 1331 and the first limiting ring 1333 to be attached, the positioning bead 1332 is clamped with the first positioning groove 1321, and the bit body 132 is installed.

[0091] When the user disassembles or replaces the bit body 132, the above steps are repeated, which will not be repeated here.

[0092] In this way, the use process of the electric bit device 13 of the preferred embodiment is completed.

[0093] The second implementation structure of the fastening assembly in the embodiment is provided as follows:

[0094] The positioning sleeve in the embodiment can be provided with an internal thread on the inner ring, and the bit seat is provided with an external thread on the outer side. The positioning sleeve is connected with the external thread of the bit seat. The position of the positioning sleeve is adjusted by screwing, so that the position of the positioning bead can be adjusted relatively, and the stability of the positioning bead in positioning the bit body is improved.

[0095] The implementation structure of the second positioning sleeve is more simplified compared to the setting of the first elastic member, which is convenient for production and assembly. In the first fastening assembly, the first elastic member is provided, which has good damping effect on the basis of realizing quick replacement of the bit body, and the structure is practical.

[0096] In combination with Figure 1 , Figure 4 and Figure 5 , the transmission device in the invention is described in detail as follows:

[0097] The transmission device 14 comprises a shaft coupling 141, the top of the shaft coupling 141 is provided with a motor connecting groove 1411, the motor connecting groove 1411 is inserted with the motor shaft 121, and the bottom of the shaft coupling 141 is connected with the top of the bit holder 131. The motor shaft 121 comprises a motor connecting part 1211, the motor connecting part 1211 is inserted with the motor connecting groove 1411; the cross section of the motor connecting part 1211 is an elliptical or polygonal structure, the cross section structure of the motor connecting groove 1411 matches the cross section structure of the motor connecting part 1211, and the cross section of the motor connecting groove 1411 is preferably also an elliptical or polygonal structure.

[0098] Further, as shown in the motor connecting part 1211 of the embodiment, the cross section is a rectangular structure, and the cross section of the motor connecting groove 1411 is also a rectangular structure, which is simple in structure, convenient for production, and strong in practicality. Figure 5

[0099] The cross section of the motor connecting part 1211 in the embodiment is an elliptical or polygonal structure, which is inserted with the corresponding structure of the motor connecting groove 1411, improves the stability of the connection between the motor shaft 121 and the shaft coupling 141, avoids the transmission shaking between the motor shaft 121 and the shaft coupling 141, and improves the stability during the use of the electric bit.

[0100] In combination with Figure 4 , the connection structure of the electric bit head device 13 and the transmission device 14 in the embodiment is described as follows:

[0101] The bottom of the shaft coupling 141 in the embodiment is provided with a bit connecting groove, the bit connecting groove is connected with the top of the bit holder 131; the bottom of the shaft coupling 141 in the embodiment is also provided with a bit connecting groove, the bit connecting groove is inserted with the top of the bit holder 131, which is convenient for replacing different bit holders 131.

[0102] The bit holder 131 comprises a bit connecting part 1314 inserted with the bit connecting groove, the cross section of the bit connecting part 1314 is an elliptical or polygonal structure, and the cross section of the bit connecting groove matches the cross section of the bit connecting part 1314. The cross section of the bit connecting part 1314 at the top of the bit holder 131 is an elliptical or polygonal structure, the cross section of the bit connecting groove is an elliptical or polygonal structure, the cross section of the bit connecting groove matches the top cross section of the bit holder 131, and the stability of the transmission of the shaft coupling 141 and the bit holder 131 is improved.

[0103] In combination with Figure 4 and Figure 6 , the structure of the transmission device 14 in the embodiment is described in detail:

[0104] ​The transmission device 14 in the embodiment comprises a bearing seat 142, a mounting flange 143, and a first bearing 144; the bearing seat 142 is connected with the shell 11, and the shaft coupling 141 is arranged in the bearing seat 142; the mounting flange 143 is connected with the top of the bearing seat 142, and the mounting flange 143 is connected with the bottom end of the output device 12; the first bearing 144 is connected with the bottom end of the bearing seat 142, and the first bearing 144 is insertedly connected with the bit seat 131.

[0105] The transmission device 14 in the embodiment further comprises a second bearing 145, which is connected with the bearing seat 142 and located below the first bearing 144, and the second bearing 145 is inserted with the bit seat 131; two bearings are arranged to be inserted with the bit seat 131, so as to improve the stability of the bit seat 131 during use, avoid the deviation caused by the left and right shaking of the bit seat 131, and have high structural practicability.

[0106] Further, the sixth limiting ring 1315 is further arranged outside the bit seat 131, the top surface of the sixth limiting ring 1315 is connected with the first bearing 144, and the bottom surface of the sixth limiting ring 1315 is connected with the second bearing 145, so as to avoid the deviation caused by the up and down shaking of the bit seat 131, and have high structural practicability.

[0107] The structure of the bearing seat 142 in the embodiment is described as follows:

[0108] The bearing seat 142 in the embodiment comprises a first mounting section 1421, a connecting section 1422, and a second mounting section 1423 arranged in sequence from top to bottom, wherein the first mounting section 1421 is located at the top of the bearing seat 142 and connected with the mounting flange 143; the second mounting section 1423 is located at the bottom of the bearing seat 142 and provided with a first receiving groove 14231, and the first bearing 144 is located in the first receiving groove 14231; the connecting section 1422 is located in the middle of the bearing seat 142 and connects the first mounting section 1421 and the second mounting section 1423, and the shaft coupling 141 is arranged in the connecting section 1422; the cross-sectional diameter of the connecting section 1422 is smaller than that of the first receiving groove 14231. The bottom surface of the connecting section 1422 can limit the position of the first bearing 144, so as to improve the practicability of the structure of the transmission device 14.

[0109] In the embodiment, the cross-sectional diameter of the second bearing 145 is larger than that of the first receiving groove 14231; the second mounting section 1423 is further provided with a second receiving groove 14232 located at the bottom end of the first receiving groove 14231, and the cross-sectional diameter of the second receiving groove 14232 is larger than that of the first receiving groove 14231; the second bearing 145 is arranged in the second receiving groove 14232, so as to improve the compactness of the structure of the transmission device 14.

[0110] The first mounting section 1421 in the embodiment is provided with a flange mounting groove 14211, and the mounting flange 143 comprises a connecting ring 1431 and a connecting sleeve 1432; the connecting ring 1431 is connected with the bottom end of the output device 12, and the connecting ring 1431 is connected with the top surface of the first mounting section 1421; the connecting sleeve 1432 is connected with the bottom end of the connecting ring 1431, the outer ring of the connecting sleeve 1432 is connected with the flange mounting groove 14211, and the shaft coupling 141 penetrates the inner ring of the connecting sleeve 1432; the structure design is compact, the mounting flange 143 fixes and connects the output device 12 and the bearing seat 142, and the stability of synchronous transmission of the output device 12 and the chuck seat 131 is improved.

[0111] Further, the bottom end of the mounting flange 143 further comprises a flange positioning column, the flange positioning column is connected with the bottom end of the connecting ring 1431; the first mounting section 1421 is provided with a flange positioning groove 14212, and the flange positioning column is inserted into the flange positioning groove 14212.

[0112] In combination with Figure 1 , Figure 6 and Figure 7 , the structure of the shell 11 in the embodiment is described as follows:

[0113] The shell 11 in the embodiment comprises a shell body 111 and a sealing cover 112; the bottom end of the shell body 111 in the embodiment is provided with an opening; the sealing cover 112 is a cylindrical structure with an open top end, the shell body 111 is inserted into the sealing cover 112, and the chuck seat 131 penetrates the bottom end of the sealing cover 112 and extends; the outer side of the bearing seat 142 is provided with a third limiting ring 1424, and the third limiting ring 1424 is connected with the bottom end of the shell body 111. The shell body 111 and the sealing cover 112 clamp the third limiting ring 1424, thereby improving the stability of the connection between the bearing seat 142 and the shell 11.

[0114] The inside of the sealing cover 112 is further provided with a second positioning ring 1123, the second positioning ring 1123 clamps the third limiting ring 1424 from the bottom surface of the shell body 111, thereby improving the stability of the connection between the shell 11 and the bearing seat 142, and making the electric wrench structure more compact.

[0115] In the embodiment, the inside of the sealing cover 112 is further provided with a third receiving groove 1121, and the bottom end of the bearing seat 142 is inserted into the third receiving groove 1121, thereby avoiding the bearing seat 142 from shaking in the shell 11, and the structure is practical.

[0116] Further, the bottom end of the sealing cover 112 in the embodiment is further provided with a fourth accommodating groove 1122, the fourth accommodating groove 1122 is communicated with the third accommodating groove 1121, and the cross-sectional diameter of the fourth accommodating groove 1122 is smaller than that of the third accommodating groove 1121; the bottom end of the second bearing 145 is inserted into the fourth accommodating groove 1122, and the sealing cover 112 limits the position of the second bearing 145 through the fourth accommodating groove 1122, thereby further improving the stability of the connection between the transmission device 14 and the shell 11, avoiding the shaking and abrasion between the second bearing 145 and the bearing seat 142, and having high structural practicability.

[0117] In combination Figure 8 And Figure 9 The second embodiment of the electric screwdriver is provided as follows:

[0118] An electric screwdriver comprises a shell 21, an output device 22, a screwdriver head device 23 and a transmission device 24; the output device 22 in the embodiment is arranged in the shell 21, and the output device 22 comprises a motor shaft 221; a bit seat 231 is rotationally connected with the shell 21, and the bottom end of the bit seat 231 penetrates through the bottom end of the shell 21 and extends downward; the transmission device 24 is arranged in the shell 21, and the transmission device connects the motor shaft 221 and the bit seat 231; wherein the transmission device 24 comprises a shaft coupling 241, the top end of the shaft coupling 241 is provided with a motor connecting groove, the motor connecting groove is inserted into the motor shaft 221; the bottom end of the shaft coupling 241 is connected with the bit seat 231; the inner side of the shaft coupling 241 is provided with a first motor positioning block 2411, the first motor positioning block 2411 is located in the motor connecting groove, and the side of the motor shaft 221 is provided with a first motor positioning groove 2211, and the first motor positioning block 2411 is clamped with the first motor positioning groove 2211.

[0119] The electric screwdriver of the embodiment drives the bit seat 231 to rotate through the output device 22, the transmission device 24 comprises a shaft coupling 241, the top of the shaft coupling 241 is provided with a motor connecting groove, the motor connecting groove is inserted into the motor shaft 221, and the bottom of the shaft coupling 241 is connected with the top of the bit seat 231. The shaft coupling 241 assembles the motor shaft 221 and the bit seat 231, facilitates the insertion and installation of the motor shaft 221 and the bit seat 231, has a simple and compact structural design, and is convenient for assembly. The inner side of the shaft coupling 241 is provided with a first motor positioning block 2411, the side of the motor shaft 221 is provided with a first motor positioning groove 2211, and the first motor positioning block 2411 is clamped with the first motor positioning groove 2211, thereby further improving the contact surface of the motor shaft 221 and the shaft coupling 241 and improving the stability of the transmission of the output device 22 driving the bit seat 231.

[0120] In combination Figure 8 The connection structure of the transmission device 24 and the bit seat 231 in the embodiment is described as follows:

[0121] The bottom end of the shaft coupling 241 in the embodiment is provided with a chuck connecting groove, the top end of the chuck seat 231 is inserted into the chuck connecting groove; the shaft coupling 241 is further provided with a first chuck positioning block 2412, the first chuck positioning block 2412 is located in the chuck connecting groove, the side wall of the chuck seat 231 is provided with a first chuck positioning groove 2311, the first chuck positioning block 2412 is clamped with the first chuck positioning groove 2311, the contact area of the chuck seat 231 and the shaft coupling 241 is increased, so that the transmission of the electric chuck is more accurate and stable in use.

[0122] In combination Figure 10 A third embodiment of an electric chuck of the present application is provided as follows:

[0123] The electric chuck in the embodiment comprises a shell 31, an output device 32, an electric chuck head device 33 and a transmission device 34; the output device 32 in the embodiment is arranged in the shell 31, the output device 32 comprises a motor shaft 321; the chuck seat 331 is rotationally connected with the shell 31, the bottom end of the chuck seat 331 penetrates the bottom end of the shell 31 and extends downward; the transmission device 34 is arranged in the shell 31, the transmission device 34 connects the motor shaft 321 with the chuck seat 331; wherein the transmission device comprises a shaft coupling 341, the top end of the shaft coupling 341 is provided with a motor connecting groove, the motor connecting groove is inserted into the motor shaft 321; the bottom end of the shaft coupling 341 is connected with the chuck seat 331; the inner side of the shaft coupling 341 is provided with a second motor positioning groove 3411, the second motor positioning groove 3411 is communicated with the motor connecting groove, the side edge of the motor shaft 321 is provided with a second motor positioning block 3211, the second motor positioning block 3211 is clamped with the second motor positioning groove 3411.

[0124] In addition, the bottom end of the shaft coupling 341 in the embodiment is provided with a chuck connecting groove, the top end of the chuck seat 331 is inserted into the chuck connecting groove, which facilitates the replacement of different models of the chuck seat 331 and improves the practicability of the electric chuck structure.

[0125] Further, the cross section of the motor shaft 321 in the embodiment can be circular, oval, polygonal or a combination of the above-mentioned shapes, in addition to the oval, polygonal and special cross section of the shaft coupling 341 and the motor shaft 321, the second motor positioning block 3211 and the second motor positioning groove 3411 are clamped, which further improves the contact area of the motor shaft 321 and the shaft coupling 341, thereby further improving the stability of the connection between the motor shaft 321 and the shaft coupling 341.

[0126] In the embodiment, the coupling 341 is further provided with a second batch head positioning groove 3412, the second batch head positioning groove 3412 is communicated with the batch head connecting groove, the side wall of the batch head seat 331 is provided with a second batch head positioning block 3311, and the second batch head positioning block 3311 is clamped with the second batch head positioning groove 3412. In the embodiment, the coupling 341 is clamped with the second batch head positioning groove 3412 and the second batch head positioning block 3311 on the batch head seat 331, the contact area of the batch head seat 331 and the coupling 341 is increased, the transmission of the electric batch driving device 34 is more accurate, and the structure is practical.

[0127] In addition, the structure of the shell 31 in the embodiment is similar to that of the shell 31 in the first embodiment; other structures of the driving device 34 are similar to those of the driving device in the first embodiment, and details are not repeated here.

[0128] In combination Figure 10 and Figure 11 A fourth embodiment of an electric batch of the application is provided as follows, and the embodiment particularly provides another implementation structure of a driving device;

[0129] The preferred embodiment of the electric batch provided by the application is as follows: an electric batch comprises a shell 41, an output device 42, an electric batch head device 43, and a driving device 44. The output device 42 is arranged at the top end inside the shell 41, and the bottom end of the output device 42 is provided with a motor shaft 421; the electric batch head device 43 comprises a batch head seat 431; the batch head seat 431 is rotationally connected with the shell 41, the batch head seat 431 is located below the motor shaft 421, and the bottom end of the batch head seat 431 extends out of the bottom end of the shell 41; the driving device 44 is arranged inside the shell 41, and the driving device 44 connects the motor shaft 421 and the batch head seat 431 to drive.

[0130] The electric batch head device 43 comprises a batch head seat 431, a batch head body 432, and a fastening assembly 433; the bottom end of the batch head seat 431 is provided with a batch head mounting groove, the side edge of the batch head seat 431 is provided with a positioning hole 4312, the positioning hole 4312 penetrates through the side wall of the batch head seat 431 and is communicated with the batch head mounting groove; the batch head body 432 is inserted with the batch head mounting groove, and the side edge of the batch head body 432 is provided with a first positioning groove 4321; the fastening assembly 433 connects the batch head seat 431 and the batch head body 432; wherein the batch head seat 431 is a columnar structure arranged vertically, the top of the batch head seat 431 is connected with the output device, and the bottom end of the batch head seat 431 is provided with a batch head mounting groove; the batch head body 432 is inserted with the batch head mounting groove, which facilitates replacement of batch head bodies 432 of different models to disassemble and assemble different screws; the fastening assembly 433 connects the batch head seat 431 and the batch head body 432, which facilitates quick disassembly and assembly of the batch head body 432 and the batch head seat 431 and improves the stability of the connection between the batch head body 432 and the batch head seat 431.

[0131] The transmission device 44 in the embodiment comprises a shaft coupling 441, a first plane bearing 442, a second plane bearing 443 and a second elastic member 444. The first plane bearing 442 is installed in the shell 41, the shaft coupling 441 is connected with the first plane bearing 442, and the stability of the shaft coupling 441 installed in the shell 41 is improved. The second plane bearing 443 is installed in the shell 41, and the second plane bearing 443 is located below the first plane bearing 442. The bit holder 431 is connected with the second plane bearing 443, and the stability of the bit holder 431 during use is improved. The second elastic member 444 is located between the first plane bearing 442 and the second plane bearing 443, and the second elastic member 444 connects the shaft coupling 441 and the bit holder 431. The second elastic member 444 connects the shaft coupling 441 and the bit holder 431, improves the stability of the connection between the shaft coupling 441 and the bit holder 431, and has a good elastic damping effect on the bit holder 431, thereby improving the practicability of the transmission device 44.

[0132] Further, the fifth limiting ring 4413 is arranged outside the shaft coupling 441, and the fourth limiting ring 4312 is arranged outside the bit holder 431. The first plane bearing 442 is connected with the inner wall of the shell 41, the shaft coupling 441 is inserted into the inner ring of the first plane bearing 442, and the fifth limiting ring 4413 is located below the first plane bearing 442. The second plane bearing 443 is connected with the shell 41, the bit holder 431 is inserted into the second plane bearing 443, and the fourth limiting ring 4312 is located above the second plane bearing 443. The top end of the second elastic member 444 is connected with the fifth limiting ring 4413, and the bottom end of the second elastic member 444 is connected with the fourth limiting ring 4312.

[0133] The second plane bearing 443 in the embodiment is connected with the shell 41, the bit head connecting part 4311 of the bit holder 431 is provided with the fourth limiting ring 4312, the fourth limiting ring 4312 is located outside the outer ring of the second plane bearing 443, the second elastic member 444 extrudes the fourth limiting ring 4312 and the inner ring of the second plane bearing 443 to be closely attached, the stability of the synchronous rotation of the bit holder 431 and the second plane bearing 443 is improved, and the abrasion caused by the relative rotation of the bit holder 431 and the second plane bearing 443 is avoided.

[0134] In combination with FIGS. 1-4, Figure 10 and Figure 11 The structure of the shell 41 is described as follows:

[0135] The shell 41 in the embodiment comprises an upper shell 411, a lower shell 412, a mounting flange 413, and a sealing cover 414; the upper shell 411 is connected with the lower shell 412 through the mounting flange 413; the lower shell 412 is provided with an opening at the bottom end, and the output device 42 is installed in the upper shell 411; the mounting flange 413 is connected with the output device 42 and the upper shell 411 at the top end, and is inserted with the lower shell 412 at the bottom end; the sealing cover 414 is connected with the lower shell 412 at the bottom end, and is used for closing the opening at the bottom end of the lower shell 412; the shell 41 in the embodiment is a spliced structure, which is convenient for assembly production and has strong structural practicability.

[0136] The mounting flange 413 in the embodiment comprises a connecting ring 4131 and a connecting sleeve 4132; the connecting sleeve 4132 is connected with the connecting ring 4131 at the bottom end, the connecting ring 4131 is connected with the output device 42 at the top end, and the upper shell 411 is closely attached to the top end of the connecting ring 4131; the connecting sleeve 4132 is inserted into the inside of the lower shell 412, and the top end of the coupling 441 extends into the connecting sleeve 4132, which improves the structural stability of the coupling 441 and the motor shaft 421 during the process of insertion assembly and use; the mounting flange 413 integrally assembles the upper shell 411, the lower shell 412, and the transmission device 44, which improves the compactness of the overall structure of the electric wrench during use.

[0137] In the embodiment, the bottom end of the mounting flange 413 further comprises a flange positioning column 4133 connected with the bottom end of the connecting ring 4131; the top end of the connecting sleeve 4132 is provided with a flange positioning groove 4122, and the flange positioning column 4133 is inserted with the flange positioning groove 4122.

[0138] In addition, the upper shell 411, the transmission device, the connecting ring 4131, the output device 42, the lower shell 412, and the connecting sleeve 4132 in the embodiment are fixedly connected through screws and other fasteners, which is convenient for the production of the overall structure of the electric wrench.

[0139] The sealing cover 414 in the embodiment is of an annular structure, and along the axial direction of the electric wrench, the sealing cover 414 comprises an insertion section 4141 and a fixed section 4142; the insertion section 4141 is connected with the top surface of the fixed section 4142, is inserted into the bottom of the lower shell 412, and the second plane bearing 443 is connected with the inner wall of the insertion section 4141; the fixed section 4142 is connected with the bottom end of the lower shell 412, and in the embodiment, the fixed section 4142 is connected with the bottom end of the lower shell 412 through screws.

[0140] Further, the top end of the fixed section 4142 in the embodiment is provided with a snap ring 41421, and the bottom end of the lower shell 412 is provided with a clamping groove 4121; the clamping groove 4121 is located and clamped with the snap ring 41421, thereby improving the stability of the connection between the sealing cover 414 and the lower shell 412.

[0141] In combination Figure 13 And Figure 14 A fifth embodiment of the electric screwdriver of the present application is provided as follows,

[0142] The preferred embodiment of the electric screwdriver provided by the present application is an electric screwdriver comprising a housing 51, an output device 52, an electric screwdriver head device 53, and a transmission device 55. The output device 52 is arranged at the top end inside the housing 51, and the bottom end of the output device 52 is provided with a motor shaft 521. The electric screwdriver head device 53 comprises a screwdriver bit seat 531. The screwdriver bit seat 531 is rotationally connected with the housing 51, and the screwdriver bit seat 531 is located below the motor shaft 521, and the bottom end of the screwdriver bit seat 531 extends out of the bottom end of the housing 51. The transmission device 55 is arranged inside the housing 51, and the transmission device 55 connects the motor shaft 521 and the screwdriver bit seat 531, so as to transmit power.

[0143] The electric screwdriver head device 53 comprises the screwdriver bit seat 531, a screwdriver bit body 532, and a fastening assembly 533. The bottom end of the screwdriver bit seat 531 is provided with a screwdriver bit mounting groove, and the side edge of the screwdriver bit seat 531 is provided with a positioning hole 5312 which penetrates through the side wall of the screwdriver bit seat 531 and communicates with the screwdriver bit mounting groove. The screwdriver bit body 532 is inserted into the screwdriver bit mounting groove, and the side edge of the screwdriver bit body 532 is provided with a first positioning groove 5321. The fastening assembly 533 connects the screwdriver bit seat 531 and the screwdriver bit body 532. The screwdriver bit seat 531 is a columnar structure arranged vertically, the top of the screwdriver bit seat 531 is connected with the output device 52, and the bottom end of the screwdriver bit seat 531 is provided with the screwdriver bit mounting groove. The screwdriver bit body 532 is inserted into the screwdriver bit mounting groove, which facilitates the replacement of screwdriver bit bodies 532 of different models, so as to disassemble and assemble different screws. The fastening assembly 533 connects the screwdriver bit seat 531 and the screwdriver bit body 532, which facilitates the quick disassembly and assembly of the screwdriver bit body 532 and the screwdriver bit seat 531, and improves the stability of the connection between the screwdriver bit body 532 and the screwdriver bit seat 531.

[0144] The transmission device 54 is mounted on the housing 51, and the transmission device 54 is used to connect the output device 52 and the electric screwdriver head device 53. The electric screwdriver head device 53 is located on one side of the output device 52. The output device 52 comprises the motor shaft 521, and the electric screwdriver head device 53 comprises the screwdriver bit seat 531. The transmission device comprises a fixing seat 541, a first mounting sleeve 542, a first gear assembly 543, and a second gear assembly 544. The fixing seat 541 is located between the output device 52 and the electric screwdriver head device 53, and the fixing seat 541 is rotationally connected with the screwdriver bit seat 531. The first mounting sleeve 542 is used to connect the output device 52. In the present embodiment, the first mounting sleeve 542 is fixedly connected with the output device 52 through the housing of the electric screwdriver. The first mounting sleeve 542 can be connected with the housing, or can be directly connected with the output device 52.

[0145] The output device 52 comprises a motor shaft 521, a first gear assembly 543 rotatably connected with a fixed seat 541, a central axis of the first gear assembly 543 extending perpendicularly to a plane on which the fixed seat 541 is located, and the first gear assembly 543 being connected with the motor shaft 521, and a second gear assembly 544 rotatably connected with the fixed seat 541, a central axis of the second gear assembly 544 extending perpendicularly to the plane on which the fixed seat 541 is located, wherein the first gear assembly 543 and the second gear assembly 544 are engaged.

[0146] The transmission device in the embodiment transmits power through the engagement of the first gear assembly 543 and the second gear assembly 544, thereby increasing the transmission stroke of the electric wrench, enabling the electric wrench to disassemble and assemble the screw in the gap, and improving the practicability of the electric wrench structure.

[0147] In combination Figure 16 and Figure 17 The transmission device 54 in the embodiment is described in detail as follows.

[0148] The transmission device in the embodiment further comprises an intermediate gear assembly 545 rotatably connected with the fixed seat 541, one side of the intermediate gear assembly 545 being engaged with the first gear assembly 543 and the other side being engaged with the second gear assembly 544. The intermediate gear assembly 545 increases the transmission stroke of the error transmission structure, thereby improving the practicability of the transmission device.

[0149] Further, the first gear assembly 543, the second gear assembly 544 and the intermediate gear assembly 545 in the embodiment are located on the same straight line, and the structure design is simple and practical.

[0150] In addition, the intermediate gear assembly 545 in the embodiment can be provided with a plurality of groups, and the plurality of groups of intermediate gears are preferably parallel to the straight line on which the first gear assembly 543 and the second gear assembly 544 are located, and the structure layout is simple and practical.

[0151] In combination Figure 15 The structure of the fixed seat 541 in the embodiment is described in detail as follows.

[0152] The fixed seat 541 in the embodiment comprises an upper cover 5411 and a lower cover 5412, the upper cover 5411 being located above the first gear assembly 543 and the second gear assembly 544, and the lower cover 5412 being located below the first gear assembly 543 and the second gear assembly 544, the upper cover 5411 and the lower cover 5412 being detachably connected, thereby facilitating the assembly of the transmission device and improving the practicability of the structure.

[0153] The first gear assembly 543 in the embodiment includes a first gear ring 5431, a first upper bearing 5432, and a first lower bearing 5433. The first gear ring 5431 is inserted with the motor shaft 521. The first upper bearing 5432 is located above the first gear ring 5431, and is connected with the upper cover 5411. The first upper bearing 5432 is inserted with the motor shaft 521. The first lower bearing 5433 is located below the first gear ring 5431, and is connected with the lower cover 5412. The first lower bearing 5433 is inserted with the motor shaft 521. The first gear assembly 543 is engaged with the second gear assembly 544 through the intermediate gear assembly 545. The first upper bearing 5432 and the first lower bearing 5433 are inserted with the motor shaft 521. This structure improves the stability of the connection between the first gear assembly 543 and the motor shaft 521.

[0154] In the embodiment, the bottom end of the upper cover 5411 is provided with a first fixing groove. The first upper bearing 5432 is accommodated in the first fixing groove, which improves the stability of the connection between the first upper bearing 5432 and the fixing seat 541. The top end of the lower cover 5412 is provided with a second fixing groove 54521. The first lower bearing 5433 is accommodated in the second fixing groove 54521, which improves the stability of the connection between the first lower bearing 5433 and the fixing seat 541.

[0155] In addition, the bottom end of the upper cover 5411 in the embodiment is provided with a positioning column. The lower cover 5412 is provided with a second positioning groove 54122. The position of the second positioning groove 54122 corresponds to the position of the positioning column. The positioning column is inserted with the second positioning groove 54122, which improves the stability of the connection between the upper cover 5411 and the lower cover 5412.

[0156] The motor shaft 521 is provided with an output limiting ring 5211. The output limiting ring 5211 abuts against the inner ring of the first upper bearing. The output limiting ring 5211 is used to limit the position of the insertion of the motor shaft 521 with the transmission device, so as to avoid the abrasion caused by the excessive insertion of the motor shaft 521, and improve the stability of the structure in use.

[0157] Further, the cross section of the motor shaft 521 is an oval or polygonal structure. The inner ring cross section structure of the first gear ring 5431 matches the cross section structure of the motor shaft 521. The inner ring cross section of the first gear ring 5431 is an oval or polygonal structure, which improves the stability and accuracy of the transmission of the motor double motor shaft 521 and the first gear.

[0158] In addition, the transmission device 54 in the embodiment further includes a second mounting sleeve 546. The bottom end of the fixing seat 541 is connected with the second mounting sleeve 546. The second mounting sleeve 546 is rotationally connected with the bit seat 531, which improves the stability of the connection between the transmission device 54 and the bit seat 531, and avoids the falling of the bit seat 531.

[0159] Combining Figure 15 The structure of the second gear assembly 544 in the embodiment is described as follows:

[0160] The second gear assembly 544 comprises a second gear ring 5441, a second upper bearing 5442 and a second lower bearing 5443. The second gear ring 5441 is inserted into the chuck seat 531 and engaged with the first gear assembly 543 for transmission. The second upper bearing 5442 is located above the second gear ring 5441 and connected with the upper cover 5411. The second lower bearing 5443 is located below the second gear ring 5441 and connected with the lower cover 5412. The second gear assembly 544 is inserted into the chuck seat 531 through the second upper bearing 5442 and the second lower bearing 5443, thereby improving the stability of the connection between the second gear assembly 544 and the chuck seat 531 and ensuring the accuracy of the transmission of the transmission device.

[0161] Combining Figure 15 The structure of the chuck seat 531 in the embodiment is described as follows:

[0162] The chuck seat 531 in the embodiment comprises an insertion section 5311, a first limiting section 5312 and a second limiting section 5313. The insertion section 5311 is located at the top end of the chuck seat 531 and is inserted into the first gear assembly 543. The first limiting section 5312 is connected with the insertion section 5311 and has a larger cross-sectional diameter than the insertion section 5311. The top surface of the first limiting section 5312 is in abutment with the bottom surface of the second lower bearing 5443. The second limiting section 5313 is located at the bottom end of the chuck seat 531 and is provided with a chuck mounting groove at the bottom end. The first limiting section 5312 is in abutment with the bottom surface of the second lower bearing 5443, thereby improving the stability of the connection between the chuck seat 531 and the second transmission gear in the embodiment and avoiding excessive insertion of the chuck seat 531 into the second gear assembly 544, which may cause wear.

[0163] The first limiting section 5312 in the embodiment is rotationally connected with the second mounting sleeve 546. The bearing flange and other structures in the second mounting sleeve 546 are conventional rotationally connecting structures between the chuck seat and the housing, which are not shown in the figure.

[0164] The cross-sectional diameter of the second limiting section 5313 is larger than that of the first limiting section 5312. The second mounting sleeve limits the insertion position of the chuck seat 531, thereby improving the stability of the transmission device.

[0165] In addition, the insertion section 5311 in the embodiment can have an elliptical or polygonal structure. The hole-like structure at the center of the first gear assembly 543 is matched with the structure of the insertion section 5311, thereby improving the stability and accuracy of the transmission between the first gear assembly 543 and the chuck seat 531.

[0166] In view of the above, although the present application has been described in connection with the preferred embodiment thereof with reference to the drawings, it will be apparent to those skilled in the art that various changes and modifications can be made which are intended to fall within the scope of the application as defined by the claims.

Claims

1. An electric screwdriver, characterized in that, include: shell; An output device is disposed within the housing, and the output device includes a motor shaft; An electric screwdriver bit assembly is connected to the housing and is located below the output device; as well as A transmission device is disposed inside the housing. The transmission device includes a coupling that connects the motor shaft to the electric screwdriver bit device. A fifth limiting ring is provided on the outer side of the coupling. The electric screwdriver bit device includes: The bit holder is a vertically arranged columnar structure. The top of the bit holder is connected to the transmission device, the bottom of the bit holder is provided with a mounting groove, and the outer side of the bit holder is provided with a fourth limiting ring. The bit body is inserted into the mounting slot. The movement trajectory of the bit body relative to the bit holder includes a fixed position and a movable position, with the fixed position positioned above the movable position. A fastening assembly connects the bit holder to the bit body; The bit holder has a positioning hole on its side, which penetrates the side wall of the bit holder and communicates with the mounting groove. The bit body has a first positioning groove on its side; The fastening assembly includes: A positioning sleeve is fitted onto the outer ring of the bit holder, and a second positioning groove is provided on the inner side of the positioning sleeve; A positioning bead is movably disposed within the positioning hole, and the cross-sectional width of the positioning bead is greater than the length of the positioning hole; The first limiting ring is connected to the outside of the bit holder. The first limiting ring is located below the positioning hole and is used to limit the position of the positioning sleeve. A second limiting ring is connected to the outside of the bit holder, the second limiting ring is located above the positioning hole, and the second limiting ring is located above the positioning sleeve; and The first elastic element connects the first limiting ring to the positioning sleeve. The first elastic element elastically compresses the positioning sleeve and the first limiting ring to keep the positioning bead in a fixed position. The transmission device also includes: A first planar bearing is connected to the inner wall of the housing; the coupling is inserted into the inner ring of the first planar bearing; and the first limiting ring is located below the first planar bearing. A second planar bearing is connected to the housing; the bit holder is inserted into the second planar bearing; and the second limiting ring is located above the second planar bearing. The second elastic element has its top end connected to the fifth limiting ring and its bottom end connected to the fourth limiting ring. When the bit body is in the fixed position, the positioning bead engages with the first positioning groove, and the inner wall of the positioning sleeve seals the outside of the positioning hole. When the bit body is in the movable position, the positioning bead engages with the second positioning groove, and the outer side of the bit body closes the inner side of the positioning hole, making it convenient for the bit body to be inserted and removed from the mounting groove.

2. The electric screwdriver according to claim 1, characterized in that, The top of the coupling is provided with a motor connection slot, which is inserted into the motor shaft. The top of the coupling is provided with a bit connection groove, which is inserted into the bit holder.

3. The electric screwdriver according to claim 2, characterized in that, The motor shaft includes a motor connection part that is inserted into the motor connection slot. The cross-section of the motor connection part is elliptical or polygonal, and the cross-section of the motor connection slot matches the cross-section of the motor connection part.

4. The electric screwdriver according to claim 2, characterized in that, The coupling has a first motor positioning block inside, which is located in the motor connection groove. The motor shaft has a first motor positioning groove on its side, and the first motor positioning block is engaged with the first motor positioning groove.

5. The electric screwdriver according to claim 2, characterized in that, The inner side of the coupling is provided with a second motor positioning groove, which is connected to the motor connection groove. The outer side of the motor shaft is provided with a second motor positioning block, which is engaged with the second motor positioning groove.

6. The electric screwdriver according to claim 1, characterized in that, The electric screwdriver bit device is located on one side of the output device, the output device includes a motor shaft, and the electric screwdriver bit device includes a bit holder; the transmission device includes: A fixed base is located between the output device and the electric screwdriver bit device, and the fixed base is rotatably connected to the bit holder; A first mounting sleeve is used to connect an output device, the output device including a motor shaft; A first gear assembly is rotatably connected to the fixed base, the central axis of the first gear assembly extends perpendicularly to the plane of the fixed base, and the first gear assembly is connected to the motor shaft; and The second gear assembly is rotatably connected to the fixed base, and the central axis of the second gear assembly extends perpendicularly to the plane where the fixed base is located. The first gear assembly meshes with the second gear assembly.

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