Electric screwdriver

Abstract

The utility model provides an electric screwdriver which comprises an outer shell and a screwdriver head seat, the screwdriver head seat is installed at one end of the outer shell and is in transmission connection with a motor in the outer shell, a battery and a control panel electrically connected with the battery are further arranged in the outer shell, the motor is electrically connected with the control panel, and the motor, the control panel and the battery are connected in series along the axis of the outer shell to form a line. Due to the fact that the motor, the control panel and the battery are arranged in a linear mode, position overlapping is not formed, radial space can be saved, and the whole screwdriver is made to be slender and convenient to hold. According to the utility model, the layout is simple, the serial parts do not interfere with each other, and the maintenance is more convenient.

Description

Technical Field

[0001] The utility model relates to an electric tool, more specifically, to an electric screwdriver. Background Art

[0002] In the existing electric screwdriver products, some of them, in pursuit of compact internal structure, often stack multiple components when installing internal components, so that some components overlap, occupying a large radial space, resulting in a large radial dimension of the screwdriver, affecting the feel during use, and often in order to inspect some components arranged in the inner layer during maintenance, the outer layer components must be removed first, resulting in inconvenience in maintenance. For example, the utility model patent with publication number CN209999070U discloses an electric screwdriver, including a housing and a drive integration, the drive integration is installed in the housing; the drive integration includes a bit adapter shaft, a motor, a power supply, a fixed housing and a circuit board, the motor is installed in the fixed housing, and the circuit board is installed outside the fixed housing. Although the screwdriver has a compact structure, the motor and the circuit board form an overlapping position, resulting in a large radial dimension and inconvenience in maintenance. Utility Model Content

[0003] Existing electric screwdrivers often have overlapping internal components, resulting in large radial dimensions and inconvenient maintenance. To overcome these defects, the utility model provides an electric screwdriver with a simpler internal layout, which is conducive to controlling the radial dimensions of the screwdriver and is easy to maintain.

[0004] The technical solution of the utility model is: an electric screwdriver, including a shell and a screwdriver bit holder, the screwdriver bit holder is installed at one end of the shell and is connected to a motor in the shell, a battery and a control board electrically connected to the battery are also arranged in the shell, the motor is electrically connected to the control board, and the motor, the control board and the battery are connected in series along the axis of the shell. The motor, the control board and the battery are connected in series in a line without overlapping positions, and the layout is simple, which can save radial space, make the screwdriver more slender as a whole, and easy to hold, especially suitable for female users with relatively small palms to operate; and the components in series will not interfere with each other, which is more convenient for maintenance.

[0005] Preferably, the output end of the motor is connected to the bit holder through a transmission assembly, which includes a claw and an outer ring sleeve, wherein the claw is sleeved on the outside of the end of the bit holder, and the outer ring sleeve is sleeved on the outside of the claw. The outer ring sleeve radially constrains the claw so that the claw is tightly clamped on the outside of the end of the bit holder, and when the claw is driven by the motor, the torque can be transmitted to the bit holder, thereby realizing the driving of the motor on the bit holder.

[0006] Preferably, the claw comprises a claw body plate and a plurality of claw bodies, the claw bodies are arranged in a ring shape and vertically fixed on the claw body plate, and a latch is provided between adjacent claw bodies. The plurality of claw bodies use the claw body plate as a carrier to maintain a stable relative position. A plurality of planes are provided on the peripheral surface of the end of the bit holder, and each claw body abuts against each plane one by one to realize the clamping connection between the claw and the bit holder.

[0007] Preferably, an inner shell is provided inside the outer shell, and the motor and the transmission assembly are located inside the inner shell. The two-layer nested shell formed by the outer shell and the inner shell can better protect the internal components of the screwdriver, such as the motor, battery and transmission assembly. At the same time, the inner shell can also provide installation support for the internal components of the screwdriver, such as the motor, battery and transmission assembly.

[0008] Preferably, the inner shell is a split structure, including two split half shells, and the two split half shells are connected by an insert connection structure. The inner shell composed of the two split half shells is separable, so that the internal parts of the screwdriver such as the motor, battery and transmission assembly can be quickly and easily installed into the inner shell.

[0009] Preferably, an inner convex ring is provided on the inner wall of the inner shell, and the inner convex ring forms a compartment separation boundary. The inner convex ring radially protrudes inside the inner shell, divides the inner space of the inner shell into different compartments, and can also axially position the internal components of the screwdriver.

[0010] Preferably, a positioning rib is provided on the inner wall of the inner shell, and the positioning rib abuts against the peripheral surface of the motor. The positioning rib abuts against the surface of the motor to limit the movement of the motor, and the motor can be conveniently and effectively positioned.

[0011] Preferably, the bit holder is provided with a diameter expansion portion, and the end sleeve of the housing where the bit holder is located is provided with a conversion head that can only move axially and can be engaged with the diameter expansion portion. The housing is also rotatably sleeved with a drive ring that is threadedly connected to the conversion head. If the electric screwdriver is idle for a long time, causing the battery power to decay, and there is no new battery available or no power supply for charging, the drive ring can be rotated to drive the conversion head to move axially and engage with the diameter expansion portion. At this time, the electric screwdriver is switched to manual working mode, and the housing transmits torque to the bit holder through the conversion head. Rotating the housing can make the bit holder rotate synchronously, and then rotate the bit inserted in the bit holder, so that the electric screwdriver can be used for a short emergency. When exiting the manual working mode, the drive ring is rotated in the opposite direction to drive the conversion head to disengage from the diameter expansion portion and reset.

[0012] Preferably, the housing is provided with circumferentially uniformly distributed protruding teeth, and a rib embedded in the protruding tooth gap is fixed in the conversion head. The rib is embedded in the protruding tooth gap to limit the relative rotation between the conversion head and the housing, so as to achieve the effect of driving the conversion head to move axially by rotating the driving ring.

[0013] Preferably, the battery is a rechargeable battery, and the control board is connected to a charging port exposed on the surface of the shell.

[0014] The beneficial effects of the utility model are:

[0015] The radial size of the whole machine is reduced, and it is convenient to use. In the utility model, the motor, the control board and the battery are arranged in series in a line without overlapping positions, which can save radial space and make the whole screwdriver machine more slender and easy to hold.

[0016] The utility model has a simple layout and is easy to maintain. The components in series will not interfere with each other, which is more convenient for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the internal structure of the utility model;

[0018] Figure 2 A structural schematic diagram of the utility model;

[0019] Figure 3 This is a schematic diagram of a split structure of the utility model;

[0020] Figure 4 It is a structural schematic diagram of the clamping claw in the utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the screwdriver bit holder in the utility model;

[0022] Figure 6 It is a schematic diagram of the structure of the outer ring sleeve in the utility model;

[0023] Figure 7 This is another structural schematic diagram of the utility model.

[0024] In the figure, 1-housing, 2-bit holder, 3-motor, 4-claw, 5-outer ring sleeve, 6-claw body, 7-inner shell, 8-inner convex ring, 9-battery, 10-control board, 11-charging port, 12-positioning convex rib, 13-conversion head, 14-drive ring, 15-diameter expansion part, 16-convex teeth, 17-rib, 18-axial hole, 19-pin, 20-front cover, 21-rear cover, 22-switch module, 23-cutting plane, 24-two-way switch, 25-base ring, 26-ring groove, 27-radial pin. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the specific embodiments of the drawings.

[0026] Embodiment 1:

[0027] like Figures 1 to 6As shown, an electric screwdriver comprises a housing 1, a screwdriver bit holder 2, a front cover 20 and a rear cover 21. The screwdriver bit holder 2 is mounted at the front end of the housing 1 and extends out after penetrating the front cover 20. One end of the screwdriver bit holder 2 is a screwdriver bit mounting end, and the other end is a transmission connection end. The screwdriver bit mounting end has a regular hexagonal slot for plugging in a detachable screwdriver bit. The transmission connection end is formed by machining three circumferentially uniformly distributed cutting planes 23 on a cylinder. The front cover 20 is clamped on the front end of the housing 1, and the rear cover 21 is threadedly connected to the rear end of the housing 1. A two-way switch 24 is provided on the housing 1, and a motor 3, a battery 9 and a control board 10 are provided in the housing 1. The control board 10 is electrically connected to the battery 9, the motor 3 is electrically connected to the control board 10, and the screwdriver bit holder 2 is transmission-connected to the motor 3. From the front end to the rear end of the housing 1, the motor 3, the control board 10 and the battery 9 are arranged in sequence and arranged in series along the axis of the housing 1. The motor 3 includes a motor body and a reducer. The overall output end of the motor 3 is the output shaft of the reducer. The front cross section of the output shaft of the reducer is arched and is a major arc. The output shaft of the reducer is connected to the bit holder 2 through a transmission assembly. The transmission assembly includes a claw 4 and an outer ring sleeve 5. The outer ring sleeve 5 is a hollow rotating body with a convex cross section. One end is fully open and the other end is provided with an end panel. The center of the end panel is connected with a sleeve. The claw 4 is clamped on the outside of the transmission connection end of the bit holder 2, and the outer ring sleeve 5 is adapted to be fitted outside the claw 4. The claw 4 includes a claw main body plate and three fan-shaped claw bodies 6. The claw bodies 6 are perpendicular to the claw main body plate and are evenly arranged in a ring on the claw main body plate. A bayonet 19 is provided between adjacent claw bodies 6. When the claw 4 is connected with the bit holder 2, the cutting plane 23 of the transmission connection end of the bit holder 2 is adjusted to correspond to the gap of the claw 4, the arc section of the transmission connection end corresponds to the claw 4, the bayonet 19 abuts on the cutting plane 23, and then the claw 4 and the bit holder 2 are inserted into the outer ring sleeve 5 as a whole. Due to the constraint of the outer ring sleeve 5, the bayonet 19 is always located in the gap of the claw 4, preventing the bit holder 2 from rotating relative to the claw 4, thereby ensuring that the claw 4 can transmit the torque from the motor 3 to the bit holder 2, and realize the driving of the bit holder 2 by the motor 3. The claw main body plate and the claw body 6 are integrally formed, and an arc-shaped shaft hole 18 is provided in the center of the claw main body plate, and the shaft hole 18 is adapted to the output shaft of the reducer.

[0028] An inner shell 7 is arranged inside the outer shell 1. The inner shell 7 is a split structure, including two split half shells. The two split half shells are assembled into a cylindrical shape through an insert connection structure. The motor 3 and the transmission assembly are installed in the inner shell 7. The insert connection structure includes a pin provided on the joint surface of one split half shell and a pin hole provided on the joint surface of the other split half shell. The pin and the pin hole are inserted and matched one by one, and the fit between the pin and the pin hole is slightly interference fit. The pin and the split half shell are integrally injection molded. An inner convex ring 8 is arranged on the inner wall of the inner shell 7. A retaining wall is arranged on the inner wall of the front and rear ends and the middle front section of the inner shell 7. The inner convex ring 8 forms a compartment separation boundary, dividing the internal space of the inner shell 7 into a transmission compartment and a battery compartment. The battery 9 is located in the battery compartment and the two ends of the battery 9 are respectively supported by the inner convex ring 8 and the retaining wall at the rear end of the inner shell 7. The motor 3, the transmission assembly and the control panel 10 are located in the transmission compartment. The transmission assembly and the motor 3 are axially positioned by the retaining wall on the front end and the inner wall of the middle front section of the inner shell 7. The control panel 10 is provided with protrusions on both sides. The inner shell 7 is provided with sockets corresponding to the protrusions one by one. The protrusions are adapted to be plugged into the sockets to fix the control panel 10. The inner wall of the inner shell 7 is provided with positioning ribs 12, which abut against the motor 3 and the outer ring sleeve 5 circumference, so that the motor 3 and the outer ring sleeve 5 are radially positioned. The battery 9 is a rechargeable battery. The control panel 10 is connected with a charging port 11, which is exposed on the surface of the outer shell 1 and the port of the charging port 11 is flush with the surface of the outer shell 1. A switch module 22 is also provided on the control board 10, and the switch module 22 is electrically connected to the control board 10. Two contacts are provided on the switch module 22, which are respectively used to control the forward and reverse circuits of the motor 3. The bidirectional switch 24 is hinged on the inner shell 7 through a rotating shaft, and the two ends of the bidirectional switch 24 correspond one-to-one to the two contacts on the switch module 22.

[0029] When using the electric screwdriver, the two-way switch 24 is pressed to turn on the contacts on the switch module 22, so that the motor 3 is powered and rotates. By pressing different ends of the two-way switch 24, the direction of the motor 3 is also different, so that the screwdriver can tighten or loosen the screw.

[0030] Embodiment 2:

[0031] like Figure 1 , Figure 7As shown, an electric screwdriver comprises a housing 1, a screwdriver bit holder 2, a front cover 20 and a rear cover 21. The screwdriver bit holder 2 is mounted at the front end of the housing 1 and extends out after penetrating the front cover 20. One end of the screwdriver bit holder 2 is a screwdriver bit mounting end, and the other end is a transmission connection end. The screwdriver bit mounting end has a regular hexagonal slot for plugging a detachable screwdriver bit. The transmission connection end is formed by machining a cutting plane 23 from a cylinder. Different from Example 1, in this embodiment, there are four cutting planes 23 and they are evenly distributed in the circumferential direction. The front cover 20 is clamped on the front end of the housing 1, and the rear cover 21 is threadedly connected to the rear end of the housing 1. The housing 1 is coated with a rubber sleeve to increase friction, so that it is not easy to slip or fall out of the hand during use. A two-way switch 24 is provided on the housing 1, and a motor 3, a battery 9 and a control board 10 are provided in the housing 1. The control board 10 is electrically connected to the battery 9, the motor 3 is electrically connected to the control board 10, and the screwdriver bit holder 2 is transmission-connected to the motor 3. From the front end to the rear end of the housing 1, the motor 3, the control board 10 and the battery 9 are arranged in sequence and arranged in a line along the axis of the housing 1. The motor 3 includes a motor body and a reducer. The overall output end of the motor 3 is the output shaft of the reducer. The front cross section of the output shaft of the reducer is arched and is a superior arc. The output shaft of the reducer is connected to the bit holder 2 through a transmission assembly. The transmission assembly includes a claw 4 and an outer ring sleeve 5. The outer ring sleeve 5 is a hollow rotating body with a convex cross section. One end of the claw 4 is fully open and the other end is provided with an end panel. The center of the end panel is connected with a sleeve. The claw 4 is clamped on the outside of the transmission connection end of the bit holder 2, and the outer ring sleeve 5 is adapted to be fitted outside the claw 4. The claw 4 includes a claw main body plate and a fan-shaped claw body 6. Different from Example 1, there are four claw bodies 6 in this embodiment. The claw bodies 6 are perpendicular to the claw main body plate and are evenly arranged in a ring on the claw main body plate. A bayonet 19 is provided between adjacent claw bodies 6. When the claw 4 is connected with the bit holder 2, the cutting plane 23 of the transmission connection end of the bit holder 2 is adjusted to correspond to the gap of the claw 4, the arc section of the transmission connection end corresponds to the claw 4, the bayonet 19 abuts on the cutting plane 23, and then the claw 4 and the bit holder 2 are inserted into the outer ring sleeve 5 as a whole. Due to the constraint of the outer ring sleeve 5, the bayonet 19 is always located in the gap of the claw 4, preventing the bit holder 2 from rotating relative to the claw 4, thereby ensuring that the claw 4 can transmit the torque from the motor 3 to the bit holder 2, and realize the driving of the bit holder 2 by the motor 3. The claw main body plate and the claw body 6 are integrally formed, and an arc-shaped shaft hole 18 is provided in the center of the claw main body plate, and the shaft hole 18 is adapted to the output shaft of the reducer. Different from Example 1, in this embodiment, the electric screwdriver also has a manual working mode.The free end of the bit holder 2, i.e., the bit mounting end of the bit holder 2, is integrally provided with a diameter expansion portion 15, which is a regular hexagon. The end of the bit holder of the housing 1 is provided with a conversion head 13 for realizing the manual working mode. The conversion head 13 is cylindrical, with an open rear end and an internal thread on the inner wall of the rear end. The conversion head 13 can only move axially. The front end of the conversion head 13 has a regular hexagonal bayonet adapted to the diameter expansion portion 15, which can adapt to the diameter expansion portion 15 as the conversion head 13 moves, and forms a clamping connection with the diameter expansion portion 15. A retaining ring is also provided at the front end of the diameter expansion portion 15, which is used to limit the axial position of the conversion head 13 to prevent the conversion head 13 from excessive axial movement. A base ring 25 is fixed to the housing 1 by screws, and a ring groove 26 is provided on the circumference of the base ring 25. A drive ring 14 is rotatably sleeved on the base ring 25, and a radial pin 27 is threadedly connected to the drive ring 14. The radial pin 27 extends into the ring groove 26. An insert is also provided in the ring groove 26. The insert is threadedly connected to the end of the radial pin 27. The radial pin 27 and the insert enable the drive ring 14 to be axially positioned on the housing 1 and can only rotate. The front end of the drive ring 14 has an external thread, and the external thread cooperates with the internal thread of the conversion head 13, so that a threaded connection is formed between the drive ring 14 and the conversion head 13. The end of the housing 1 where the bit seat is located is provided with convex teeth 16, and the convex teeth 16 are evenly distributed along the circumference of the housing 1. Axially extending ribs 17 are fixed in the conversion head 13 and the ribs 17 are adapted to be embedded in the gaps of the convex teeth 16. The axial length of the ribs 17 is shorter than the axial length of the convex teeth 16. The cooperation between the ribs 17 and the convex teeth 16 realizes the circumferential positioning of the conversion head 13 on the housing 1, and it can only slide axially.

[0032] An inner shell 7 is arranged inside the outer shell 1. The inner shell 7 is a split structure, including two split half shells. The two split half shells are assembled into a cylindrical shape through an insert connection structure. The motor 3 and the transmission assembly are installed in the inner shell 7. The insert connection structure includes a pin provided on the joint surface of one split half shell and a pin hole provided on the joint surface of the other split half shell. The pin and the pin hole are inserted and matched one by one, and the fit between the pin and the pin hole is slightly interference fit. The pin and the split half shell are integrally injection molded. An inner convex ring 8 is arranged on the inner wall of the inner shell 7. A retaining wall is arranged on the inner wall of the front and rear ends and the middle front section of the inner shell 7. The inner convex ring 8 forms a compartment separation boundary, dividing the internal space of the inner shell 7 into a transmission compartment and a battery compartment. The battery 9 is located in the battery compartment and the two ends of the battery 9 are respectively supported by the inner convex ring 8 and the retaining wall at the rear end of the inner shell 7. The motor 3, the transmission assembly and the control panel 10 are located in the transmission compartment. The transmission assembly and the motor 3 are axially positioned by the retaining wall on the front end and the inner wall of the middle front section of the inner shell 7. The control panel 10 is provided with protrusions on both sides. The inner shell 7 is provided with sockets corresponding to the protrusions one by one. The protrusions are adapted to be plugged into the sockets to fix the control panel 10. The inner wall of the inner shell 7 is provided with positioning ribs 12, which abut against the motor 3 and the outer ring sleeve 5 circumference, so that the motor 3 and the outer ring sleeve 5 are radially positioned. The battery 9 is a rechargeable battery. The control panel 10 is connected with a charging port 11, which is exposed on the surface of the outer shell 1 and the port of the charging port 11 is flush with the surface of the outer shell 1. A switch module 22 is also provided on the control board 10, and the switch module 22 is electrically connected to the control board 10. Two contacts are provided on the switch module 22, which are respectively used to control the forward and reverse circuits of the motor 3. The bidirectional switch 24 is hinged on the inner shell 7 through a rotating shaft, and the two ends of the bidirectional switch 24 correspond one-to-one to the two contacts on the switch module 22.

[0033] When using the electric screwdriver, press the two-way switch 24 to turn on the contacts on the switch module 22, so that the motor 3 is powered on and rotates. Pressing different ends of the two-way switch 24 will cause the motor 3 to turn in different directions, so that the screwdriver can tighten or loosen the screws. If the electric screwdriver is idle for a long time, causing the battery 9 to decay, and there is no new battery available or no power supply for charging, the drive ring 14 can be rotated to drive the conversion head 13 to move axially, and the bayonet of the conversion head 13 is engaged with the diameter expansion part 15. At this time, the electric screwdriver is switched to the manual working mode, and the housing 1 transmits torque to the bit holder 2 through the conversion head 13. Rotating the housing 1 can make the bit holder 2 rotate synchronously, and then rotate the bit inserted into the bit holder 2, so that the electric screwdriver can be used for emergency use to loosen or tighten the screws. When exiting the manual working mode, the drive ring 14 is rotated in the opposite direction to drive the conversion head 13 to disengage from the diameter expansion part 15 and then reset.

Claims

1. An electric screwdriver, comprising a housing (1) and a screwdriver bit holder (2), wherein the screwdriver bit holder (2) is mounted on one end of the housing (1) and is drivingly connected to a motor (3) in the housing (1), wherein a battery (9) and a control board (10) electrically connected to the battery (9) are also provided in the housing (1), and the motor (3) is electrically connected to the control board (10), wherein: The motor (3), the control panel (10) and the battery (9) are arranged in series in a line along the axis of the housing (1).

2. The electric screwdriver according to claim 1, characterized in that: The output end of the motor (3) is connected to the bit holder (2) via a transmission assembly, wherein the transmission assembly comprises a clamping claw (4) and an outer ring sleeve (5), wherein the clamping claw (4) is clamped on the outside of the end of the bit holder (2), and the outer ring sleeve (5) is sleeved on the outside of the clamping claw (4).

3. The electric screwdriver according to claim 2, characterized in that: The clamping claw (4) comprises a clamping claw main body plate and a plurality of clamp bodies (6); the clamp bodies (6) are arranged in a ring shape and are vertically fixed on the clamping claw main body plate; and clamping pins are provided between adjacent clamp bodies (6).

4. The electric screwdriver according to claim 2, characterized in that: An inner shell (7) is provided inside the outer shell (1), and the motor (3) and the transmission assembly are located inside the inner shell (7).

5. The electric screwdriver according to claim 4, characterized in that: The inner shell (7) is a split structure, comprising two split half shells, and the two split half shells are connected via an insert connection structure.

6. The electric screwdriver according to claim 4, characterized in that: An inner convex ring (8) is provided on the inner wall of the inner shell (7), and the inner convex ring (8) forms a compartment separation boundary.

7. The electric screwdriver according to claim 4, characterized in that: A positioning convex rib (12) is provided on the inner wall of the inner shell (7), and the positioning convex rib (12) abuts against the peripheral surface of the motor (3).

8. The electric screwdriver according to claim 1, characterized in that: The bit seat (2) is provided with a diameter expansion portion (15), and the end sleeve of the housing (1) where the bit seat is located is provided with a conversion head (13) that can only move axially and can be snap-connected with the diameter expansion portion (15). The housing (1) is also rotatably sleeved with a drive ring (14) that is threadedly connected to the conversion head (13).

9. The electric screwdriver according to claim 8, characterized in that: The outer shell (1) is provided with convex teeth (16) evenly distributed in the circumferential direction, and a rib (17) embedded in the gap between the convex teeth (16) is fixed in the conversion head (13).

10. The electric screwdriver according to any one of claims 1 to 9, characterized in that: The battery (9) is a rechargeable battery, and the control panel (10) is connected to a charging port (11) exposed on the surface of the housing (1).

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