Electric screwdriver

Abstract

The utility model relates to the technical field of screwdrivers, in particular to an electric screwdriver, which comprises a motor, and is characterized in that a concentric limiting sleeve is matched and butted with the end part of the motor, an output shaft of the motor penetrates through the concentric limiting sleeve, and a connecting sleeve is matched and butted with the outer side of the output end of the motor; the upper end of the connecting sleeve extends into the concentric limiting sleeve piece, and the screwdriver head is in butt joint with the interior of the lower end of the connecting sleeve in a matched mode. Through the arrangement of the concentric limiting sleeve piece, concentric limiting is conducted on the butt joint position of the screwdriver head and the output shaft of the motor, and concentricity is kept; and shaking and vibration caused by low concentricity are avoided, and the using stability of the electric screw driver is improved.

Description

Technical Field

[0001] This utility model relates to the field of screwdriver technology, specifically to electric screwdrivers. Background Technology

[0002] Electric screwdrivers, as tools that convert electrical energy into rotational kinetic energy to drive screws for tightening or loosening, are widely used in modern industrial production, equipment maintenance, electronic assembly, and home DIY. Their basic working principle typically involves a motor driving a transmission mechanism that transmits power to an output shaft. The screwdriver bit mounted at the end of the output shaft then engages with the screw head, applying rotational torque.

[0003] Many basic or general-purpose electric screwdrivers in the current technology have relatively simple structural designs, typically including a handle, an internal motor, a transmission system, a switch, and a bit mounted on the output shaft. When installing the screwdriver bit onto the output shaft, due to the lack of a precise positioning and locking mechanism, it is easy for the bit to be installed incorrectly or at an angle. This installation error directly causes the center line of the bit to not coincide with the rotation center line of the motor output shaft. When the bit and the shaft are not concentric, an eccentric mass will be generated during rotation, causing the tool to wobble and vibrate significantly when tightening screws, affecting the user experience.

[0004] Therefore, an electric screwdriver is needed to improve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide an electric screwdriver to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An electric screwdriver includes a motor, with a concentric limiting kit mating at the end of the motor, the output shaft of the motor passing through the concentric limiting kit, and a connecting sleeve mating on the outer side of the motor output end, the upper end of the connecting sleeve extending into the interior of the concentric limiting kit, and a screwdriver bit mating on the lower end of the connecting sleeve.

[0008] As a preferred embodiment of this utility model, the concentric limiting kit includes a bearing sleeve, the bearing sleeve having a plurality of bearings inside, and the plurality of bearings being disposed on the outer side of the upper end of the connecting sleeve to concentrically limit the connection between the motor output end and the bit.

[0009] As a preferred embodiment of this utility model, the bearing is provided in a set, and the two bearings are positioned between the bearing sleeve and the connecting sleeve.

[0010] As a preferred embodiment of this utility model, the bearing sleeve has vertically arranged screw holes a through both sides, and the motor end has mounting holes corresponding to the positions of the screw holes a on both sides. The screw holes a and the mounting holes are connected by screws a.

[0011] As a preferred embodiment of this utility model, the connecting sleeve has several horizontally arranged screw holes b on both sides, and each screw hole b has a screw b inside.

[0012] As a preferred embodiment of this utility model, the output shaft of the motor and the end of the bit are both fixedly connected to the connecting sleeve by screw b.

[0013] As a preferred embodiment of this utility model, a contact switch is provided on one side of the motor, and the contact switch and the motor are connected to a power cord, which is connected to an external power source to achieve power supply.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention uses a concentric limiting kit to concentrically limit the connection between the screwdriver bit and the motor output shaft, maintaining concentricity. Compared with existing screwdriver bit connection methods, this avoids shaking and vibration caused by low concentricity, thus improving the stability of the electric screwdriver during use. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is an exploded view of the present invention;

[0018] Figure 3 This is a cross-sectional view of the present invention.

[0019] In the diagram: 1. Motor; 2. Contact switch; 3. Power cord; 4. Bearing sleeve; 5. Connecting sleeve; 6. Screw hole b; 7. Screw bit; 8. Bearing; 9. Screw hole a; 10. Screw b11. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] To facilitate understanding of this utility model, a more comprehensive description of it will be provided below with reference to relevant embodiments. Several embodiments of this utility model are given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0022] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] Please see Figure 1-3 This utility model provides a technical solution:

[0025] For an example, please refer to... Figure 1 , 2 3. An electric screwdriver, including a motor 1, a contact switch 2 is provided on one side of the motor 1, the contact switch 2 and the motor 1 are connected to a power cord 3, and the power cord 3 is connected to an external power source to achieve power supply, the end of the motor 1 is fitted with a concentric limiting kit, the output shaft of the motor 1 is set through the concentric limiting kit, and the outer side of the output end of the motor 1 is fitted with a connecting sleeve 5, the upper end of the connecting sleeve 5 extends into the interior of the concentric limiting kit, and the lower end of the connecting sleeve 5 is fitted with a screwdriver bit 7.

[0026] By using a concentric limit kit, the connection between the screwdriver bit and the motor output shaft is concentrically limited, maintaining concentricity. Compared to existing screwdriver bit connection methods, this avoids shaking and vibration caused by low concentricity, thus improving the stability of the electric screwdriver during use.

[0027] Please refer to Figure 1 , 23. The concentric limiting kit includes a bearing sleeve 4, inside which are arranged several bearings 8. The bearings 8 are sleeved on the outer side of the upper end of the connecting sleeve 5 to concentrically limit the connection between the output end of the motor 1 and the bit 7. A set of bearings 8 is provided, with two bearings 8 limiting the connection between the bearing sleeve 4 and the connecting sleeve 5. Vertically arranged screw holes a9 are opened through both sides of the bearing sleeve 4. Mounting holes corresponding to the positions of screw holes a9 are opened on both sides of the end of the motor 1. Screws a10 are used to connect the screw holes a9 and the mounting holes.

[0028] The bearing sleeve 4 is connected to the end of the motor 1 by screw a10, and the whole can be easily disassembled. The bearing 8 is installed inside, and the upper end of the connecting sleeve 5 is limited and maintained by the bearing 8, which improves the concentricity of the connection with the output shaft of the motor 1.

[0029] The connecting sleeve 5 has several horizontally arranged screw holes b6 on both sides. Each screw hole b6 has a screw b11 inside. The output shaft of the motor 1 and the end of the bit 7 are fixedly connected to the connecting sleeve 5 by screw b11.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A power screwdriver comprising a motor (1), characterized in that: The end of the motor (1) is matched with a concentric limiting sleeve assembly, the output shaft of the motor (1) penetrates the concentric limiting sleeve assembly, and the outer side of the output end of the motor (1) is matched with a connecting sleeve (5), the upper end of the connecting sleeve (5) extends to the inside of the concentric limiting sleeve assembly, and the lower end of the connecting sleeve (5) is matched with a chuck (7) inside.

2. The electric screwdriver according to claim 1, characterized in that: The concentric limiting sleeve assembly comprises a bearing sleeve (4), the inside of the bearing sleeve (4) is provided with a plurality of bearings (8), and the plurality of bearings (8) are sleeved on the outer side of the upper end of the connecting sleeve (5), and the connection between the output end of the motor (1) and the chuck (7) is concentrically limited.

3. The power screwdriver according to claim 2, characterized in that: The bearing (8) is provided with a group, and two bearings (8) are limited between the connecting sleeve (5) and the output shaft of the motor (1).

4. The power screwdriver according to claim 3, characterized in that: The two sides of the bearing sleeve (4) are provided with vertically arranged screw holes a (9), and the two sides of the end of the motor (1) are provided with mounting holes corresponding to the positions of the screw holes a (9), and the screw holes a (9) and the mounting holes are connected through screws a (10).

5. The power screwdriver according to claim 4, characterized in that: The two sides of the connecting sleeve (5) are provided with a plurality of horizontally arranged screw holes b (6), and the inside of each screw hole b (6) is provided with a screw b (11).

6. The power screwdriver according to claim 5, characterized by: The output shaft of the motor (1) and the end of the chuck (7) are fixedly connected with the connecting sleeve (5) through the screw b (11).

7. The power screwdriver according to any one of claims 1 to 6, characterized in that: One side of the motor (1) is provided with a contact switch (2), the contact switch (2) and the motor (1) are connected with a power line (3), and an external power supply is connected through the power line (3) to realize power supply.

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