Electric screwdriver

Abstract

The utility model discloses an electric screwdriver which comprises a shell, a main body, a main shaft and a buffering piece, a driving piece is arranged in the shell, the main body is arranged on the shell, two bearings are arranged on the main shaft in the axis direction of the main shaft at intervals, the main shaft is rotationally arranged in the main body through the two bearings, and the main shaft is connected with the driving piece. The main shaft is provided with an accommodating space for inserting the bit and a mounting hole communicated with the accommodating space; the buffer piece is arranged in the mounting hole in a penetrating mode and can abut against the screwdriver head inserted into the containing space. The main shaft of the electric screwdriver is rotationally arranged in the main body through the two bearings, so that the radial stress of the main shaft during rotation can be improved, the stability of the main shaft when the main shaft drives the screwdriver head to rotate is ensured, the screwdriver head is prevented from shaking during rotation, and the working noise is reduced; moreover, the screwdriver head is abutted against the buffer piece after being inserted into the accommodating space of the main shaft, and the buffer piece can provide buffer for the screwdriver head, so that the screwdriver head is prevented from abutting against the screw in a hard manner, and the screw is prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical tools, in particular to an electric screwdriver. Background Art

[0002] Electric screwdrivers, also known as electric screwdrivers and electric screwdrivers, are electric tools used to tighten or loosen screws. Compared with manual screwdrivers, electric screwdrivers use a driver to drive the screwdriver bit to rotate. They do not require manual rotation, which can save manpower and improve the efficiency of tightening or loosening screws. They are one of the most widely used assembly tools. Although electric screwdrivers can improve the efficiency of tightening or loosening screws and save manpower, the stability of the screwdriver bit is poor when it rotates and it is very easy to damage the screws.

[0003] Therefore, it is necessary to provide a new electric screwdriver to solve the above-mentioned problems. Utility Model Content

[0004] The main purpose of the utility model is to provide an electric screwdriver, aiming to solve the problem that the existing electric screwdriver drives the screw bit to rotate with poor stability and is very easy to damage the screw.

[0005] To achieve the above object, the utility model provides an electric screwdriver, comprising:

[0006] A housing in which a driving member is disposed;

[0007] A main body, wherein the main body is arranged on the shell;

[0008] A spindle, wherein two bearings are arranged at intervals along the axis direction of the spindle, the spindle is rotatably arranged in the main body through the two bearings, and the spindle is connected to the driving member, and the spindle is provided with an accommodating space for inserting a screwdriver bit and a mounting hole connected to the accommodating space;

[0009] A buffer component is inserted into the mounting hole and can abut against the bit inserted into the accommodating space.

[0010] In one embodiment, the buffer member is a spring, the spring is inserted into the mounting hole, and the spring can abut against the bit inserted into the accommodating space.

[0011] In one embodiment, a limit block is formed at the connection point between the accommodating space and the mounting hole, and the spring can abut against the limit block.

[0012] In one embodiment, the main shaft is provided with a transmission hole, the transmission hole is coaxially arranged with the mounting hole, the driving member is a driving motor, the output end of the driving motor is inserted into the transmission hole, and the end of the spring away from the accommodating space abuts against the output end of the driving motor.

[0013] In one embodiment, the main shaft is formed with two stepped portions, the two bearings are arranged in one-to-one correspondence with the two stepped portions, and the bearings are sleeved on the stepped portions.

[0014] In one embodiment, the electric screwdriver also includes a sliding sleeve, which is slidably arranged at an end of the main shaft away from the driving member along the axial direction of the main shaft, and the main shaft is provided with a accommodating hole extending along its radial direction, and a limiting steel ball is arranged in the accommodating hole, and the sliding sleeve can drive the limiting steel ball to be inserted into the annular limiting groove of the bit.

[0015] In one embodiment, the number of the accommodating holes is three, the three accommodating holes are evenly spaced along the circumference of the main shaft, and the limiting steel ball is disposed in each of the accommodating holes.

[0016] In one embodiment, an annular groove is formed on the inner wall of the sliding sleeve; the limiting steel ball can be separated from the annular limiting groove of the bit and inserted into the annular groove.

[0017] In one embodiment, a compression spring is sleeved on the main shaft, one end of the compression spring abuts against the bearing of the two bearings away from the driving member, the other end of the compression spring abuts against the sliding sleeve, and a retaining ring is provided at one end of the main shaft away from the driving member; the compression spring can drive the sliding sleeve to abut against the retaining ring, and cause the annular groove to be misaligned with the accommodating hole.

[0018] In one embodiment, the main body includes a shell and a fixing block, the fixing block is sleeved on the shell, and the fixing block is connected to the outer shell.

[0019] In the technical solution of the utility model, the spindle is rotatably arranged in the main body through two bearings, which can improve the radial force of the spindle when it rotates, so that the spindle has better coaxiality and ensures the stability of the spindle when driving the screwdriver to rotate; at the same time, when the screwdriver is tightening and loosening the screw, one end of the screwdriver inserted into the accommodating space abuts against the buffer, and the buffer can provide a buffer for the screwdriver to avoid the screwdriver from being hard against the screw when tightening or loosening the screw, causing damage to the screw. In the related art, the spindle of the electric screwdriver is mostly rotated through a single bearing, and the radial force of the spindle is poor. The spindle is very easy to deviate, causing the screwdriver to shake when rotating and making a loud working noise; and when tightening or loosening the screw, the screwdriver is mostly hard against the screw, which is very easy to damage the screw. The main shaft of the electric screwdriver is rotatably arranged in the main body via two bearings, which can improve the radial force of the main shaft when rotating, ensure the stability of the main shaft when driving the bit to rotate, thereby avoiding the bit from shaking during rotation and reducing working noise; and, after the bit is inserted into the accommodating space of the main shaft, it abuts against the buffer component, and the buffer component can provide a buffer for the bit to avoid the bit from hardening against the screw, thereby preventing the screw from being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the overall structure of the electric screwdriver in the embodiment of the utility model;

[0022] Figure 2 for Figure 1 sectional view of;

[0023] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0024] Description of Figure Numbers:

[0025] Label name Label name 100 shell 110 Drive parts 111 Drive motor 120 Aviation connector 200 main body 210 case 220 Fixed block 300 Spindle 310 Bearings 320 Accommodation space 321 Limit block 330 Mounting holes 340 Transmission hole 350 Accommodation hole 351 Limiting steel ball 360 Compression spring 370 Retaining Ring 400 Buffer 410 spring 500 Sliding Bushing 510 Annular groove 600 Batch Head 610 Annular limit groove

[0026] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] The utility model provides an electric screwdriver, aiming to solve the problem that the existing electric screwdriver has poor stability in driving a screwdriver head to rotate and is very easy to damage the screw.

[0033] The embodiment of the utility model provides an electric screwdriver, such as Figure 1 and Figure 2As shown, the electric screwdriver includes a housing 100, a main body 200, a spindle 300 and a buffer member 400. A driving member 110 is arranged in the housing 100, the main body 200 is arranged in the housing 100, and the spindle 300 is provided with two bearings 310 at intervals along its axial direction. The spindle 300 is rotatably arranged in the main body 200 through the two bearings 310, and the spindle 300 is connected to the driving member 110. The spindle 300 is provided with an accommodating space 320 for inserting a screwdriver bit 600 and a mounting hole 330 connected to the accommodating space 320; the buffer member 400 is penetrated in the mounting hole 330, and the buffer member 400 can abut against the screwdriver bit 600 inserted in the accommodating space 320.

[0034] In the embodiment of the utility model, the spindle 300 is rotatably arranged in the main body 200 through two bearings 310, which can improve the radial force of the spindle 300 when rotating, so that the spindle 300 has better coaxiality, and ensure the stability of the spindle 300 when driving the screwdriver 600 to rotate; at the same time, when the screwdriver 600 is tightening and loosening the screw, one end of the screwdriver 600 inserted into the accommodating space 320 abuts against the buffer 400, and the buffer 400 can provide a buffer for the screwdriver 600 to avoid the screwdriver 600 from being hard against the screw when tightening or loosening the screw, causing damage to the screw. In the related art, the spindle 300 of the electric screwdriver is mostly rotated through a single bearing 310, and the radial force of the spindle 300 is poor. The spindle 300 is very easy to deviate, causing the screwdriver 600 to shake when rotating and making a loud working noise; and when tightening or loosening the screw, the screwdriver 600 is mostly hard against the screw, which is very easy to damage the screw. The spindle 300 of the electric screwdriver is rotatably disposed in the main body 200 via two bearings 310, which can improve the radial force of the spindle 300 when rotating, ensure the stability of the spindle 300 when driving the bit 600 to rotate, thereby avoiding the bit 600 from shaking when rotating and reducing working noise; and, after the bit 600 is inserted into the accommodating space 320 of the spindle 300, it abuts against the buffer 400, and the buffer 400 can provide a buffer for the bit 600 to avoid the bit 600 from hardening the screw, thereby preventing the screw from being damaged.

[0035] like Figure 2 As shown, the buffer 400 is a spring 410, which is inserted into the mounting hole 330 and can abut against the screwdriver bit 600 inserted into the accommodating space 320. The spring 410 is inserted into the mounting hole 330, and the mounting hole 330 can provide a guide for the expansion and contraction of the spring 410; and the spring 410 has the characteristics of simple structure and low manufacturing cost. Selecting the spring 410 as the buffer 400 can reduce the manufacturing difficulty and manufacturing cost of the electric screwdriver.

[0036] like Figure 2 and Figure 3As shown, a limit block 321 is formed at the connection between the accommodating space 320 and the mounting hole 330, and the spring 410 can abut against the limit block 321. The limit block 321 can limit the position of the spring 410 to prevent the spring 410 from sliding out of the mounting hole 330 through the accommodating space 320 when the screwdriver bit 600 is not inserted into the accommodating space 320. In this embodiment, in addition to the spring 410, the buffer 400 can also be a compression spring, etc., which only needs to enable the buffer 400 to provide a buffer for the screwdriver bit 600 to prevent the screwdriver bit 600 from being hard against the screw when tightening or loosening the screw.

[0037] like Figure 2 As shown, the main shaft 300 is provided with a transmission hole 340, which is coaxially arranged with the mounting hole 330. The driving member 110 is a driving motor 111, and the output end of the driving motor 111 is inserted into the transmission hole 340. The end of the spring 410 away from the accommodating space 320 abuts against the output end of the driving motor 111. In the related art, the drive motor 111 is usually connected to the main shaft 300 through a coupling so that the drive motor 111 can drive the main shaft 300 to rotate. However, when using a coupling for transmission, it is very easy to cause unstable rotation of the main shaft 300 due to the matching differences between the transmission components. In this embodiment, the output end of the drive motor 111 is inserted into the transmission hole 340 to achieve the drive motor 111 driving the main shaft 300 to rotate. This can make the transmission between the drive motor 111 and the main shaft 300 more direct, improve the stability of the main shaft 300 during rotation, and reduce the difficulty of assembling the electric screwdriver. In this embodiment, one side of the transmission hole 340 is a plane, which is used to prevent the drive motor 111 and the main shaft 300 from rotating relative to each other.

[0038] like Figure 2 and Figure 3 As shown, the electric screwdriver further includes a sleeve 500, which is slidably disposed at one end of the spindle 300 away from the driving member 110 along the axial direction of the spindle 300, and the spindle 300 is provided with a receiving hole 350 extending radially thereof, and a limiting steel ball 351 is disposed in the receiving hole 350, and the sleeve 500 can drive the limiting steel ball 351 to be inserted into the annular limiting groove 610 of the screwdriver bit 600. When the screwdriver bit 600 is inserted into the accommodating space 320, the sleeve 500 can drive the limiting steel ball 351 to be inserted into the annular limiting groove 610 of the screwdriver bit 600 to lock the screwdriver bit 600 and prevent the screwdriver bit 600 from being separated from the accommodating space 320. Further, the number of the accommodating holes 350 is three, and the three accommodating holes 350 are evenly spaced along the circumferential direction of the spindle 300, and each accommodating hole 350 is provided with a limiting steel ball 351. The three limiting steel balls 351 lock the bit 600 at the same time, which can ensure the stability of the bit 600 when it is locked in the accommodating space 320, and at the same time, can also ensure the stability of the bit 600 when it rotates.

[0039] like Figure 3 As shown, an annular groove 510 is formed on the inner wall of the sliding sleeve 500; the limiting steel ball 351 can be separated from the annular limiting groove 610 of the screwdriver bit 600 and inserted into the annular groove 510. When the screwdriver bit 600 needs to be removed, the user only needs to push the sliding sleeve 500 so that the annular groove 510 of the sliding sleeve 500 is aligned with the accommodating hole 350, so that the limiting steel ball 351 can be separated from the annular limiting groove 610 of the screwdriver bit 600 and inserted into the annular groove 510 to unlock the screwdriver bit 600. The user can remove the screwdriver bit 600 from the accommodating space 320 by pulling the screwdriver bit 600 outward.

[0040] like Figure 2 and Figure 3 As shown, a compression spring 360 is sleeved on the spindle 300, one end of the compression spring 360 abuts against the bearing 310 far away from the driving member 110 of the two bearings 310, and the other end of the compression spring 360 abuts against the sliding sleeve 500, and a retaining ring 370 is provided at one end of the spindle 300 far away from the driving member 110; the compression spring 360 can drive the sliding sleeve 500 to abut against the retaining ring 370, and misalign the annular groove 510 with the accommodating hole 350. The compression spring 360 can drive the annular groove 510 to misalign with the accommodating hole 350, that is, the sliding sleeve 500 can always drive the limiting steel ball 351 to be inserted into the annular limiting groove 610 of the screwdriver bit 600, so as to prevent the screwdriver bit 600 from falling when the electric screwdriver is used; the retaining ring 370 can limit the position of the sliding sleeve 500 to prevent the sliding sleeve 500 from being separated from the spindle 300.

[0041] like Figure 2 As shown, the main body 200 includes a shell 210 and a fixing block 220, the fixing block 220 is sleeved on the shell 210, and the fixing block 220 is connected to the shell 100. The shell 210 is mounted on the shell 100 through the fixing block 220; in this embodiment, an aviation connector 120 is provided at one end of the shell 100 away from the fixing block 220, and the aviation connector 120 is used to power the electric screwdriver and realize signal transmission between the electric screwdriver and an external electronic device. At the same time, an external power storage device can power the electric screwdriver through the aviation connector 120; in this embodiment, a mounting hole is provided on the fixing block 220, and when in use, the user can mount the electric screwdriver on the rack of the corresponding device through the mounting hole.

[0042] like Figure 2As shown, the main shaft 300 is formed with two step portions, and the two bearings 310 are arranged in a one-to-one correspondence with the two step portions, and the bearings 310 are sleeved on the step portions. The step portion can limit the installation position of the bearing 310 to ensure the stable position of the bearing 310. Correspondingly, the inner wall of the housing 210 has two step portions, and the two step portions are arranged in a one-to-one correspondence with the two bearings 310, wherein the step portion is used to limit the inner ring of the bearing 310, and the step portion is used to limit the outer ring of the bearing 310 to ensure the stable position of the bearing 310. In this embodiment, the two step portions of the inner wall of the housing 210, one of which is formed when the housing 210 is manufactured, and the other step portion is formed by opening a groove on the inner wall of the housing 210 and inserting a retaining ring into the groove.

[0043] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. An electric screwdriver, characterized in that: include: A housing in which a driving member is disposed; A main body, wherein the main body is arranged on the shell; A spindle, wherein two bearings are arranged at intervals along the axis direction of the spindle, the spindle is rotatably arranged in the main body through the two bearings, and the spindle is connected to the driving member, and the spindle is provided with an accommodating space for inserting a screwdriver bit and a mounting hole connected to the accommodating space; A buffer component is inserted into the mounting hole and can abut against the bit inserted into the accommodating space.

2. The electric screwdriver according to claim 1, characterized in that: The buffer member is a spring, the spring is inserted into the mounting hole, and the spring can abut against the bit inserted into the accommodating space.

3. The electric screwdriver according to claim 2, characterized in that: A limit block is formed at the connection point between the accommodating space and the mounting hole, and the spring can abut against the limit block.

4. The electric screwdriver according to claim 2, characterized in that: The main shaft is provided with a transmission hole, which is coaxially arranged with the mounting hole. The driving member is a driving motor, and the output end of the driving motor is inserted into the transmission hole. One end of the spring away from the accommodating space abuts against the output end of the driving motor.

5. The electric screwdriver according to claim 1, characterized in that: The main shaft is formed with two stepped portions, the two bearings are arranged in one-to-one correspondence with the two stepped portions, and the bearings are sleeved on the stepped portions.

6. The electric screwdriver according to any one of claims 1 to 5, characterized in that: The electric screwdriver also includes a sliding sleeve, which is slidably arranged at an end of the main shaft away from the driving member along the axial direction of the main shaft. The main shaft is provided with a receiving hole extending along its radial direction. A limiting steel ball is arranged in the receiving hole. The sliding sleeve can drive the limiting steel ball to be inserted into the annular limiting groove of the bit.

7. The electric screwdriver according to claim 6, characterized in that: The number of the accommodating holes is three, the three accommodating holes are evenly spaced along the circumference of the main shaft, and the limiting steel ball is arranged in each of the accommodating holes.

8. The electric screwdriver according to claim 6, characterized in that: An annular groove is formed on the inner wall of the sliding sleeve; the limiting steel ball can be separated from the annular limiting groove of the screwdriver bit and inserted into the annular groove.

9. The electric screwdriver according to claim 8, characterized in that: A compression spring is sleeved on the main shaft, one end of the compression spring abuts against the bearing of the two bearings away from the driving member, the other end of the compression spring abuts against the sliding sleeve, and a retaining ring is provided at the end of the main shaft away from the driving member; the compression spring can drive the sliding sleeve to abut against the retaining ring, and cause the annular groove to be misaligned with the accommodating hole.

10. The electric screwdriver according to any one of claims 1 to 5, characterized in that: The main body comprises a shell and a fixing block, wherein the fixing block is sleeved on the shell and connected to the outer shell.

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