Electric screwdriver

Abstract

The utility model relates to the technical field of screwdrivers, in particular to an electric screwdriver which comprises a motor, the end of the motor is in butt joint with a bearing assembly in a matched mode, an output shaft of the motor penetrates through the bearing assembly and is in butt joint with a connecting sleeve, and the end of the connecting sleeve is in butt joint with a screwdriver bit in a matched mode. Compared with an electric screwdriver structure in the prior art, through the arrangement of the bearing assembly and the concentric limiting piece, the electric screwdriver structure can limit the connecting position of the output shaft and the screwdriver head to keep concentricity, the stability of the screwdriver head during rotation is guaranteed, and the electric screwdriver structure has the advantages that the bearing assembly and the concentric limiting piece are arranged on the outer side of the connecting position of the output shaft and the screwdriver head; and shaking and vibration are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to screwdriver technical field, concretely is electric screwdriver. BACKGROUND

[0002] Electric screwdriver as a kind of electric energy conversion is rotated kinetic energy to drive screw to be fastened or disassembled tool, it has been widely applied in modern industrial production, equipment maintenance, electronic assembly and family DIY etc. Field. Its basic working principle is usually driven by motor transmission mechanism, power transmission to output shaft, and the screwdriver bit installed at the end of output shaft is matched with screw head, to exert rotation torque.

[0003] Many basic or general electric screwdriver structure design in prior art is relatively simple, usually including handle, internal motor, transmission system, switch and the bit installed on output shaft, when screwdriver bit is installed to output shaft, due to lack of precise positioning and locking mechanism, it is easy to appear installation not in place or skew, this installation error directly leads to the center line of bit and the rotation center line of motor output shaft cannot coincide, when bit and shaft are not concentric, eccentric mass is generated in the process of rotation, lead to tool when tightening screw produces obvious shaking and vibration, affect operation experience.

[0004] Therefore, an electric screwdriver is needed to improve the above problems. INVENTION CONTENTS

[0005] The utility model aims at providing an electric screwdriver to solve the problems in the above background.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] An electric screwdriver, comprising a motor, the end of the motor is matched with a bearing assembly, the output shaft of the motor penetrates the bearing assembly and is matched with a connecting sleeve, and the end of the connecting sleeve is matched with a bit, and a concentric limiting piece is arranged outside the connection between the connecting sleeve and the bearing assembly.

[0008] As a preferred scheme of the utility model, the bearing assembly comprises a bearing seat, a group of bearings b are arranged inside the bearing seat, and the bearings b are limitedly arranged between the bearing seat and the output shaft of the motor.

[0009] As a preferred scheme of the utility model, screw holes b vertically arranged are formed on the two sides of the bearing seat, an installation hole is formed on the end of the motor, and the screw holes b and the installation hole are connected by screws b.

[0010] As the preferred scheme of the utility model, the connecting sleeve is provided with a plurality of horizontally arranged screw holes a on both sides, and a screw a is arranged in each screw hole a to keep the output shaft of the motor and the end of the bit in close contact and fixed.

[0011] As the preferred scheme of the utility model, the concentric limiting part comprises a bearing sleeve, a plurality of screw holes c are arranged through the side of the bearing sleeve, a plurality of screw holes d corresponding to the positions of the screw holes c are arranged on the side of the bearing seat, and a screw c is arranged between the screw hole d and the screw hole c.

[0012] As the preferred scheme of the utility model, the inside bottom end of the bearing sleeve is connected with a convex ring, a bearing a is arranged above the convex ring, and the bearing a is arranged between the bearing sleeve and the connecting sleeve.

[0013] As the preferred scheme of the utility model, the end of the motor is provided with a contact switch on one side, the contact switch is connected with the motor through a power line, and the motor is connected with an external power supply through the power line.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] The utility model discloses a bearing assembly and a concentric limiting part, compared with the electric screwdriver structure in the prior art, the connecting part of the output shaft and the bit can be limited and kept concentric, the stability of the bit rotation is ensured, and shaking and vibration are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the first perspective view of the utility model;

[0017] Figure 2 It is the utility model's explosion map;

[0018] Figure 3 It is the second perspective view of the utility model;

[0019] Figure 4 It is the section view of the utility model.

[0020] In the drawing: motor 1, power line 2, contact switch 3, bearing sleeve 4, bearing seat 5, connecting sleeve 6, bit 7, screw hole a 8, screw hole b 9, screw b 10, screw hole c 11, mounting hole 12, bearing a 13, bearing b 14. DETAILED DESCRIPTION

[0021] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments, and based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant. Several embodiments of the present application are given. However, the present application can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0023] It should be noted that when an element is referred to as being "fixedly attached" to another element, it can be directly on the other element or there can be intervening elements. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. The terms "vertical", "horizontal", "left", "right", and the like as used herein are for purposes of illustration only.

[0024] 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 the present application belongs. The terminology used in the description of the present application herein only for the purpose of describing specific embodiments and is not intended to limit the present application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] Please refer to Figures 1-4 The present application provides a technical scheme:

[0026] Embodiments, please refer to Figure 1 、 2 , 3 and 4, an electric screwdriver, comprising a motor 1, the end of the motor 1 side is provided with a contact switch 3, the contact switch 3 and the motor 1 between the connection has a power line 2, the motor 1 through the power line 2 external power supply, the end of the motor 1 is matched with the bearing assembly, the output shaft of the motor 1 penetrates the bearing assembly and is matched with the connecting sleeve 6, and the end of the connecting sleeve 6 is matched with the bit 7, and the connecting sleeve 6 and the connecting place of the bearing assembly are provided with concentric limiting members outside.

[0027] By setting the bearing assembly and the concentric limiting member between the bit and the output shaft of the motor 1, the connecting place is limited to maintain concentricity, so that the screwdriver remains stable in rotation when in use, avoiding shaking and vibration.

[0028] Please refer toFigure 1 、 2 , 3 and 4, the bearing assembly comprises a bearing seat 5, the inside of the bearing seat 5 is provided with a group of bearings b14, the bearings b14 are limitedly arranged between the bearing seat 5 and the output shaft of the motor 1, the two sides of the bearing seat 5 are provided with vertically arranged screw holes b9, the end of the motor 1 is provided with a mounting hole 12, the screw holes b9 and the mounting hole 12 are connected through the screws b10.

[0029] The bearing seat 5 is fixedly connected with the end of the motor 1 through the screws b10, and the outer side of the connecting sleeve 6 is limitedly kept concentric by the bearings b14.

[0030] Please refer to Figure 1 、 2 , 3 and 4, the two sides of the connecting sleeve 6 are provided with a plurality of horizontally arranged screw holes a8, each screw hole a8 is provided with a screw a in the inside, and the output shaft of the motor 1 and the end of the bit 7 are kept tightly fixed by the screw a.

[0031] The output shaft of the motor 1 and the end of the bit 7 are kept tightly fixed by the screw a arranged on the outer side of the connecting sleeve 6.

[0032] The concentric limiting piece comprises a bearing sleeve 4, a plurality of screw holes c11 are arranged through the side of the bearing sleeve 4, a plurality of screw holes d corresponding to the positions of the screw holes c11 are arranged on the side of the bearing seat 5, the screw holes d and the screw holes c11 are connected with the screws c, the inside of the bearing sleeve 4 is connected with a convex ring 15 at the bottom end, the bearing a13 is arranged above the convex ring 15, and the bearing a13 is limitedly arranged between the bearing sleeve 4 and the connecting sleeve 6.

[0033] The bearing sleeve 4 is arranged on the outer sides of the bearing seat 5 and the connecting sleeve 6, so as to limit the connecting position and keep the concentricity.

[0034] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model 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 bearing assembly, the output shaft of the motor (1) penetrates the bearing assembly and is matched with a connecting sleeve (6), the end of the connecting sleeve (6) is matched with a chuck (7), and the outer side of the connecting position of the connecting sleeve (6) and the bearing assembly is provided with a concentric limiting piece.

2. The electric screwdriver according to claim 1, characterized in that: The bearing assembly comprises a bearing seat (5), and a group of bearings b (14) are arranged in the bearing seat (5), and the bearings b (14) are arranged in position between the bearing seat (5) and the output shaft of the motor (1).

3. The power screwdriver according to claim 2, characterized in that: The bearing seat (5) is provided with vertically arranged screw holes b (9) on both sides, the end of the motor (1) is provided with a mounting hole (12), and the screw holes b (9) and the mounting hole (12) are connected through screws b (10).

4. The power screwdriver according to claim 2 or 3, characterized in that: The connecting sleeve (6) is provided with a plurality of horizontally arranged screw holes a (8) on both sides, and a screw a is arranged in each screw hole a (8), so that the output shaft of the motor (1) and the end of the chuck (7) are kept in close contact and fixed.

5. The power screwdriver according to claim 4, characterized in that: The concentric limiting piece comprises a bearing sleeve (4), a plurality of screw holes c (11) are arranged in the side of the bearing sleeve (4), a plurality of screw holes d corresponding to the positions of the screw holes c (11) are arranged in the side of the bearing seat (5), and screws c are arranged between the screw holes d and the screw holes c (11).

6. The power screwdriver according to claim 5, characterized by: The inner bottom end of the bearing sleeve (4) is connected with a convex ring (15), a bearing a (13) is arranged above the convex ring (15), and the bearing a (13) is arranged in position between the bearing sleeve (4) and the connecting sleeve (6).

7. The power screwdriver according to claim 6, characterized by: The end of the motor (1) is provided with a contact switch (3) on one side, the contact switch (3) and the motor (1) are connected with a power line (2), and the motor (1) is connected with an external power supply through the power line (2).

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