Electric tool

Abstract

The utility model relates to an electric tool which comprises a motor, an output shaft, a gearbox assembly and a locking piece, and the output shaft outputs torsion under the driving force of the motor; the gear box assembly comprises a gear transmission assembly and a box body, the box body is provided with at least one through hole, the axis of the through hole is perpendicular to the axis of the output shaft, and the through hole is symmetrically arranged along the axis of the output shaft; the locking piece is inserted into the through hole, a first step part is arranged on the inner wall of the box body, the through hole penetrates through the first step part and is provided with a first end located outside the box body and a second end located on the inner wall of the box body, and the plane where the second end of the through hole is located is parallel to the axis of the output shaft. According to the electric tool, the contact area between the insert pin and the mold sliding block can be reduced in the box forming process, then friction between the insert and the mold sliding block is reduced, the mold repairing frequency is further reduced, and meanwhile the structural strength of the insert pin can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric tools, and in particular to an electric tool. Background Art

[0002] An electric drill is a commonly used power tool, mainly used for drilling holes or tightening screws in various materials. It is driven by a built-in motor that converts electrical energy into mechanical energy to achieve the function of rotating the drill bit.

[0003] The electric drill includes a gearbox, which contains a gear set for adjusting the speed and torque of the motor to adapt to different working requirements. During the manufacturing process of the gearbox, inserts are required to ensure that the box has a through hole for installing the pin.

[0004] However, during the molding process of the gearbox (for example, through the injection molding process), since the gearbox is cylindrical, the insert head has a beveled structure with a large contact area with the mold slider and is relatively weak, making it easy to break, increasing the number of maintenance times and reducing the molding efficiency of the gearbox. Utility Model Content

[0005] In view of this, an embodiment of the present application provides an electric tool to solve at least one problem existing in the background technology.

[0006] In a first aspect, an embodiment of the present application provides an electric tool, comprising:

[0007] motor;

[0008] an output shaft, configured to output torque under the driving force of the motor;

[0009] a gear box assembly, comprising a gear transmission assembly and a housing for accommodating the gear transmission assembly, wherein the gear transmission assembly is used to transmit the driving force of the motor to the output shaft;

[0010] The box body is provided with at least one through hole, the axis of the through hole is perpendicular to the axis of the output shaft, and the through holes are symmetrically arranged along the axis of the output shaft;

[0011] A locking piece is inserted into the through hole, a first step portion is provided on the inner wall of the box body, the through hole passes through the first step portion, the through hole has a first end located outside the box body and a second end located on the inner wall of the box body, and the plane where the second end of the through hole is located is parallel to the axis of the output shaft.

[0012] In combination with the first aspect of the present application, in an optional embodiment, the first step portion includes a first step surface and a second step surface, the second end of the through hole is located on the first step surface, and the first step surface is parallel to the axis of the output shaft.

[0013] In combination with the first aspect of the present application, in an optional embodiment, the second step surface is perpendicular to the first step surface.

[0014] In combination with the first aspect of the present application, in an optional embodiment, a second step portion is provided at a position on the outer wall of the box body corresponding to the through hole, the through hole passes through the second step portion, and the end of the locking member is connected to the second step portion.

[0015] In combination with the first aspect of the present application, in an optional embodiment, the locking member is a pin with a cylindrical structure.

[0016] In combination with the first aspect of the present application, in an optional embodiment, the box body is provided with two through holes, and the two through holes are respectively located on both sides of the axis of the box body and are symmetrically arranged.

[0017] In combination with the first aspect of the present application, in an optional embodiment, the gear transmission assembly includes a first inner ring gear, which is arranged adjacent to the locking member, and the locking member is used to prevent the first inner ring gear from moving along its axis.

[0018] In combination with the first aspect of the present application, in an optional embodiment, the gear transmission assembly further includes a planetary gear meshing with the first inner ring gear and a sun gear meshing with the planetary gear.

[0019] In combination with the first aspect of the present application, in an optional embodiment, the gear transmission assembly further includes a second inner ring gear and a third inner ring gear, and the first inner ring gear, the second inner ring gear and the third inner ring gear are distributed in sequence along the axial direction of the output shaft; wherein, the first inner ring gear is away from the motor and close to the output shaft.

[0020] In combination with the first aspect of the present application, in an optional embodiment, the housing includes a first housing and a second housing, and the first housing is connected to the second housing along the axial direction of the output shaft.

[0021] The electric tool provided in the embodiment of the present application is capable of reducing the contact area between the insert and the mold slider during the box forming process by providing a first step portion on the inner wall of the box and a through hole passing through the first step portion, and the plane where the second end of the through hole is located is parallel to the axis of the output shaft, thereby reducing the friction between the insert and the mold slider, further reducing the number of mold repairs, and also increasing the structural strength of the insert.

[0022] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 A schematic structural diagram of a box and an insert in the related art of an embodiment of the present application;

[0025] Figure 2 A partial cross-sectional schematic diagram of a power tool provided in an embodiment of the present application;

[0026] Figure 3 A schematic diagram of the exploded structure of the housing and locking member of the power tool provided in an embodiment of the present application;

[0027] Figure 4 A schematic plan view of a box structure in an electric tool provided in an embodiment of the present application;

[0028] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0029] Reference numerals:

[0030] 100. Power tools; a. Inserts;

[0031] 10. Motor; 20. Output shaft;

[0032] 30. Gearbox assembly;

[0033] 310, housing; 31a, first housing; 31b, second housing; 311, through-hole; 3111, first end; 3112, second end; 312, first step portion; 3121, first step surface; 3122, second step surface; 313, second step portion;

[0034] 320, gear transmission assembly; 321, first inner ring gear; 322, sun gear; 323, planetary gear; 324, second inner ring gear; 324, third inner ring gear;

[0035] 40. Locking piece. DETAILED DESCRIPTION

[0036] To make the technical solutions and beneficial effects of the present invention more clearly understood, the following detailed description is given by way of specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly illustrate the details of the local features. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application belongs.

[0037] In the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of simplifying the description of the present invention, and do not indicate that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and should not be understood as a limitation to the present invention.

[0038] In this disclosure, the terms "first" and "second" are used solely for descriptive purposes and should not be construed as indicating the relative importance of the features indicated or the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, and "several" means at least one, such as one, two, or three, unless otherwise specifically defined.

[0039] In the present invention, unless otherwise expressly defined, the terms "installed," "connected," "connect," "fixed," and "disposed" should be understood broadly. For example, "connection" can mean fixed, removable, or integrated; it can mean mechanical or electrical; it can mean direct or indirect connection through an intermediary; it can also mean internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0040] In the present invention, unless otherwise clearly defined, when a first feature is “on,” “above,” “above,” “above,” “below,” “below,” or “below” a second feature, the first feature and the second feature may be in direct contact, or the first feature and the second feature may be in indirect contact via an intermediate medium. Moreover, when a first feature is “on,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0041] Figure 1 Figure 3 shows a schematic diagram of a gearbox housing 310 having a through hole 311 and an insert a having an inclined surface. The inclined surface of insert a is relatively weak and has a large contact area with the mold slider during the manufacturing process of the gearbox housing 310. This results in significant wear and tear, making it prone to breakage, increasing the number of repairs, and increasing labor and time costs.

[0042] Based on this, an embodiment of the present application provides an electric tool 100, which is provided with a first step portion 312 at the through hole 311 on the inner wall of the box body 310. The first step portion 312 makes the plane where the second end 3112 of the through hole 311 located on the inner wall of the box body 310 is parallel to the axis of the output shaft 20. In this way, the contact area between the insert and the mold slider of the box body 310 during the molding process can be greatly reduced, thereby reducing the friction between the insert and the mold slider, thereby reducing the number of mold repairs, and at the same time, it can also increase the structural strength of the insert.

[0043] Specifically, if Figures 2 to 5 As shown, the power tool 100 includes a motor 10, an output shaft 20, a gear box assembly 30 and a locking member 40. The output shaft 20 outputs torque under the driving force of the motor 10. The gear box assembly 30 includes a gear transmission assembly 320 and a housing 310 that accommodates the gear transmission assembly 320. The gear transmission assembly 320 is used to transmit the driving force of the motor 10 to the output shaft 20. The housing 310 is provided with at least one through hole 311. The axis of the through hole 311 is perpendicular to the axis of the output shaft 20, and the through holes 311 are symmetrically arranged along the axis of the output shaft 20. The locking member 40 is connected to the housing 310 and inserted into the through hole 311. The locking member 40 is inserted into the through hole 311 to prevent the inner gear ring of the gear transmission assembly 320 from moving to ensure torque output.

[0044] like Figure 4 and Figure 5As shown, a first step portion 312 is provided on the inner wall of the box body 310, and a through hole 311 passes through the first step portion 312. The through hole 311 passes through the first step portion 312, and the through hole 311 has a first end 3111 located outside the box body 310 and a second end 3112 located at the inner wall of the box body 310. The plane where the second end 3112 of the through hole 311 is located is parallel to the axis of the output shaft 20.

[0045] It can be understood that during the molding process of the box body 310, the position corresponding to the second end 3112 of the through hole 311 of the insert a is a flat structure rather than a sloped structure, thereby greatly reducing the contact area between the insert a and the mold slider, which not only reduces the number of mold repairs, but also increases the structural strength of the insert a.

[0046] In an alternative embodiment, if Figure 5 As shown, the first step portion 312 includes a first step surface 3121 and a second step surface 3122 . The second end 3112 of the through hole 311 is located on the first step surface 3121 , and the first step surface 3121 is parallel to the axis of the output shaft 20 .

[0047] That is, in the embodiment of the present application, the plane where the second end 3112 of the through hole 311 is located is coplanar with the first step surface 3121 , which can reduce the structural complexity of the inner wall of the box body 310 .

[0048] Furthermore, the second step surface 3122 is perpendicular to the first step surface 3121 , that is, the second step surface 3122 is perpendicular to the axis of the output shaft 20 , further reducing the structural complexity of the inner wall of the box body 310 .

[0049] In an optional embodiment, a second step portion 313 is provided on the outer wall of the housing 310 at a position corresponding to the through hole 311. The through hole 311 extends through the second step portion 313, and the end of the locking member 40 is connected to the second step portion 313. The second step portion 313 has a third step surface, and the through hole 311 extends through the third step surface. The third step surface is parallel to the first step surface 3121, thereby enabling the through hole 311 to have a cylindrical structure, and thus the insert a to have a cylindrical structure. Compared to the insert a with an inclined end structure, the insert a with a planar structure at both ends has a higher structural strength.

[0050] Specifically, the locking member 40 is a pin with a cylindrical structure.

[0051] In an alternative embodiment, if Figure 3 As shown, the housing 310 is provided with two through-holes 311, which are symmetrically arranged on either side of the axis of the housing 310. Two pins are inserted into the housing 310 to block the inner gear ring of the gear transmission assembly 320 from moving in two directions, thereby ensuring the stability of the gear transmission assembly 320 within the housing 310.

[0052] The gear transmission assembly 320 further includes planetary gears 323 meshing with the first inner ring gear 321 and a sun gear 322 meshing with the planetary gears 323 .

[0053] The gear transmission assembly 320 further includes a second inner gear ring 324 and a third inner gear ring 324. The first inner gear ring 321, the second inner gear ring 324 and the third inner gear ring 324 are sequentially distributed along the axis direction of the output shaft 20. Among the first inner gear ring 321, the second inner gear ring 324 and the third inner gear ring 324, the first inner gear ring 321 is away from the motor 10 and close to the output shaft 20. Figure 2 3 and 4. It is shown in FIG. 3 that the first inner ring gear 321 is the one closest to the output shaft 20.

[0054] The housing 310 includes a first housing 31a and a second housing 31b. The first housing 31a is connected to the second housing 31b along the axis of the output shaft 20. The second housing 31b is closer to the output shaft 20 and farther from the motor 10 along the axis of the output shaft 20.

[0055] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations of the claims. Various modifications and variations may be made to the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form additional embodiments of the present application that may not be explicitly described. Therefore, the above embodiments merely illustrate several implementations of the present application and do not limit the scope of protection of the patent application.

Claims

1. An electric tool (100), characterized in that: The electric tool (100) comprises: Motor (10); an output shaft (20) for outputting torque under the driving force of the motor (10); a gear box assembly (30) comprising a gear transmission assembly (320) and a housing (310) for accommodating the gear transmission assembly (320), wherein the gear transmission assembly (320) is used to transmit the driving force of the motor (10) to the output shaft (20); The box body (310) is provided with at least one through hole (311), the axis of the through hole (311) is perpendicular to the axis of the output shaft (20), and the through holes (311) are symmetrically arranged along the axis of the output shaft (20); A locking member (40) is inserted into the through hole (311); a first step portion (312) is provided on the inner wall of the box body (310); the through hole (311) passes through the first step portion (312); the through hole (311) has a first end (3111) located outside the box body (310) and a second end (3112) located at the inner wall of the box body (310); the plane where the second end (3112) of the through hole (311) is located is parallel to the axis of the output shaft (20).

2. The electric tool (100) according to claim 1, characterized in that The first step portion (312) includes a first step surface (3121) and a second step surface (3122), the second end (3112) of the through hole (311) is located on the first step surface (3121), and the first step surface (3121) is parallel to the axis of the output shaft (20).

3. The electric tool (100) according to claim 2, characterized in that The second step surface (3122) is perpendicular to the first step surface (3121).

4. The electric tool (100) according to claim 2, characterized in that A second step portion (313) is provided at a position corresponding to the outer wall of the box body (310) and the through hole (311), the through hole (311) passes through the second step portion (313), and the end of the locking member (40) is connected to the second step portion (313).

5. The electric tool (100) according to any one of claims 1 to 4, characterized in that: The locking member (40) is a pin with a cylindrical structure.

6. The electric tool (100) according to claim 1, characterized in that The box body (310) is provided with two through holes (311), and the two through holes (311) are respectively located on two sides of the axis of the box body (310) and are symmetrically arranged.

7. The electric tool (100) according to claim 1, characterized in that The gear transmission assembly (320) includes a first inner gear ring (321), the first inner gear ring (321) is arranged adjacent to the locking member (40), and the locking member (40) is used to prevent the first inner gear ring (321) from moving along its axis.

8. The electric tool (100) according to claim 7, characterized in that The gear transmission assembly (320) further includes a planetary gear (323) meshed with the first inner gear ring (321) and a sun gear (322) meshed with the planetary gear (323).

9. The electric tool (100) according to claim 7, characterized in that The gear transmission assembly (320) also includes a second inner ring gear (324) and a third inner ring gear (325), wherein the first inner ring gear (321), the second inner ring gear (324) and the third inner ring gear (325) are distributed in sequence along the axial direction of the output shaft (20); wherein the first inner ring gear (321) is away from the motor (10) and close to the output shaft (20).

10. The electric tool (100) according to claim 1, characterized in that The housing (310) comprises a first housing (310) and a second housing (310), wherein the first housing (310) is connected to the second housing (310) along the axial direction of the output shaft (20).

Images