Gearbox and electric tool

Abstract

The utility model relates to a gearbox and an electric tool. The gearbox comprises a front shell, the front shell is provided with a first cavity used for containing a reduction gear mechanism of the electric tool, the front shell is provided with a first installation part, a first buckling part and a first limiting structure, and the first installation part is used for being installed on a machine shell of the electric tool; the rear cover covers the rear end face of the front shell, and the rear cover is provided with a second buckling part and a second limiting structure; the first buckling part and the second buckling part are buckled to limit the movement of the rear cover relative to the front shell; and the first limiting structure and the second limiting structure are matched to limit rotation of the rear cover relative to the front shell. According to the technical scheme, the size of a machine shell of the electric tool can be reduced.

Description

Technical Field

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

[0002] There are various types of electric tools, which are widely used in various fields of industrial manufacturing. For example, electric drills are widely used because of their large torque and ease of use. They are often used for drilling and screwing. Electric tools generally have a variety of speeds to adapt to workpieces of different materials and sizes. Therefore, electric tools are provided with a reduction gear mechanism and a gear box for accommodating the reduction gear mechanism. The gear box includes a front shell and a rear cover, and the rear cover is arranged on the rear end face of the front shell, which makes it difficult to miniaturize the radial size of the rear cover.

[0003] In the existing electric tools, the outer peripheral side of the rear cover is provided with a radially extending positioning boss, which cooperates with the slot of the housing of the electric tool to limit the rotation of the rear cover. The provision of the positioning boss increases the radial size of the rear cover, which is not conducive to reducing the radial size of the electric tool. Summary of the invention

[0004] In view of this, embodiments of the present application provide a gear box and an electric tool to solve at least one problem existing in the background technology.

[0005] To achieve the above purpose, the technical solution of this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a gear box for use in an electric tool, the gear box comprising:

[0007] A front shell, which is provided with a first cavity for accommodating the reduction gear mechanism of the electric tool, and the front shell is provided with a first mounting portion, a first buckling portion, and a first limiting structure, wherein the first mounting portion is used to be mounted on the housing of the electric tool;

[0008] A rear cover is arranged on the rear end surface of the front shell, and the rear cover is provided with a second buckling portion and a second limiting structure; the first buckling portion and the second buckling portion are buckled to limit the movement of the rear cover relative to the front shell; the first limiting structure and the second limiting structure cooperate to limit the rotation of the rear cover relative to the front shell.

[0009] In combination with the first aspect of the present invention, in an optional embodiment, the first buckle connection portion is a buckle groove provided on the inner wall of the front shell; the second buckle connection portion is a buckle extending along the axial direction of the rear cover.

[0010] In combination with the first aspect of the present invention, in an optional embodiment, the rear end face of the front shell is provided with a positioning protrusion, and the positioning protrusion and the first buckle portion are staggered in the radial direction of the front shell; the rear cover is provided with a notch, and the positioning protrusion is inserted into the notch.

[0011] In combination with the first aspect of the present invention, in an optional implementation, the number of the first buckling portions and the number of the second buckling portions are both at least two, and are evenly distributed along the circumference of the front shell.

[0012] In combination with the first aspect of the present invention, in an optional implementation manner, the first limiting structure is clamped to the second limiting structure along the axial direction of the front shell.

[0013] In combination with the first aspect of the present invention, in an optional implementation, the first limiting structure includes a rib protruding from the inner wall of the front shell, and the second limiting structure includes a groove provided on the front side wall of the rear cover.

[0014] In combination with the first aspect of the present invention, in an optional embodiment, a first annular boss is provided at the rear of the front shell, a second boss is provided on the front side wall of the rear cover, and the second boss abuts against the first boss axially;

[0015] The first limiting structure protrudes from the first boss along a direction toward the rear cover, and the second limiting structure is disposed on the second boss.

[0016] In combination with the first aspect of the present invention, in an optional embodiment, there are at least three first limiting structures, which are evenly distributed along the circumference of the front shell, and the first limiting structures and the first buckling parts are staggered in the circumferential direction; the second limiting structures are matched one by one with the first limiting structures.

[0017] In combination with the first aspect of the present invention, in an optional embodiment, the front shell includes a first shell segment and a second shell segment connected in sequence in the front-to-rear direction, and the outer contour of the first shell segment protrudes from the outer contour of the second shell segment; the first mounting portion does not protrude from the outer contour of the first shell segment.

[0018] In a second aspect, an embodiment of the present application provides an electric tool, comprising:

[0019] The housing has a second cavity;

[0020] Any one of the gear boxes described above is located in the second cavity; the inner wall of the housing is provided with a second mounting portion, and the second mounting portion is connected to the first mounting portion.

[0021] The gearbox and the electric tool provided in the embodiment of the present application include: a front shell, which is provided with a first cavity for accommodating the reduction gear mechanism of the electric tool, the front shell is provided with a first mounting portion, a first buckling portion, and a first limiting structure, the first mounting portion is used to be installed on the housing of the electric tool; a rear cover, which is provided on the rear end surface of the front shell, and the rear cover is provided with a second buckling portion and a second limiting structure; the first buckling portion and the second buckling portion are buckled to limit the movement of the rear cover relative to the front shell; the first limiting structure and the second limiting structure cooperate to limit the rotation of the rear cover relative to the front shell. It can be seen that the gearbox and the electric tool in the embodiment of the present application improve the gearbox, and the first mounting portion installed with the housing is provided on the front shell with a smaller outer peripheral contour. Compared with the structure connected with the housing provided on the rear cover, the outer contour of the gearbox can be made smaller, which is conducive to reducing the housing size of the electric tool. Therefore, the gearbox and the electric tool in the embodiment of the present application are conducive to reducing the housing size of the electric tool.

[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 the 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 diagram of an electric tool provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of a gearbox provided in an embodiment of the present application;

[0026] Figure 3 A schematic diagram of a front housing in a gearbox provided in an embodiment of the present application;

[0027] Figure 4 A schematic diagram of a rear cover in a gearbox provided in an embodiment of the present application.

[0028] Description of reference numerals:

[0029] 10. Casing; 11. Second mounting portion; 20. Gear box; 21. Front housing; 211. First mounting portion; 212. First buckling portion; 213. First limiting structure; 214. Positioning protrusion; 215. First boss; 217. First housing section; 218. Second housing section; 22. Back cover; 221. Second buckling portion; 222. Second limiting structure; 223. Notch; 224. Second boss. DETAILED DESCRIPTION

[0030] In order to make the technical solutions and beneficial effects of the present application more obvious and easy to understand, the following is a detailed description by listing specific embodiments. The drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show 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 the present application belongs.

[0031] In the description of the present application, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of simplified description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present application.

[0032] In this application, the terms "first" and "second" are used only for the purpose of clear description and should not be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly include at least one of the features. In the description of this application, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly defined, the terms "install", "connect", "connect", "fix", "set", etc. should be understood in a broad sense. For example, "connection" 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, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In the present application, unless otherwise clearly defined, a first feature being “on”, “above”, “above”, “below”, “below”, “below” or “below” a second feature may mean that the first feature is in direct contact with the second feature, or the first feature and the second feature are in indirect contact with each other through an intermediate medium. Moreover, a first feature being “on”, “above” or “above” a second feature 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. A first feature being “below”, “below” or “below” a second feature 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.

[0035] In order to thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0036] In view of the technical problems in the related art, the present application embodiment provides a gear box 20, which is applied to an electric tool, referring to Figure 1-Figure 4 , the gear box 20 comprises:

[0037] A front shell 21, which is provided with a first cavity for accommodating the reduction gear mechanism of the electric tool, and the front shell 21 is provided with a first mounting portion 211, a first buckling portion 212, and a first limiting structure 213, wherein the first mounting portion 211 is used to be mounted on the housing 10 of the electric tool;

[0038] The rear cover 22 is arranged on the rear end surface of the front shell 21, and the rear cover 22 is provided with a second buckling portion 221 and a second limiting structure 222; the first buckling portion 212 and the second buckling portion 221 are buckled to limit the movement of the rear cover 22 relative to the front shell 21; the first limiting structure 213 and the second limiting structure 222 cooperate to limit the rotation of the rear cover 22 relative to the front shell 21.

[0039] It can be understood that the front and rear in the front shell 21 and the rear cover 22 are relative to the workload, that is, the front end faces the workload, and the rear end is the other end opposite. For example, the front end of an electric drill is the end where the drill bit is installed.

[0040] The embodiments of the present application are introduced by taking an electric drill as an example, but it can be understood that other electric tools with similar structures may also be used.

[0041] In this embodiment, the rear cover 22 of the gear box 20 may also be the front cover of the motor, so that the structure is more compact and the cost is low.

[0042] It can be understood that the first mounting portion 211 , the first buckling portion 212 and the first limiting structure 213 can all be detachable connection structures.

[0043] Specifically, the first limiting structure 213 and the second limiting structure 222 are matched in circumferential dimensions to limit the rear cover 22 from rotating relative to the front shell 21 .

[0044] It is understandable that, for an electric drill, the outer contour size of the rear cover 22 is greater than or equal to the outer contour size of the front shell 21. In this embodiment, the first mounting portion 211 is disposed on the front shell 21, which does not increase the outer contour size of the entire gear box 20.

[0045] The gear box 20 of the embodiment of the present application is improved, and a first mounting portion 211 mounted to the housing 10 is provided on the front housing 21 with a smaller outer periphery. Compared with the structure connected to the housing 10 provided on the rear cover 22, the outer profile of the gear box 20 can be made smaller, which is conducive to reducing the size of the housing 10 of the power tool.

[0046] In some other embodiments of the present application, the first buckle portion 212 is a buckle groove provided on the inner wall of the front shell 21 ; the second buckle portion 221 is a buckle extending along the axial direction of the rear cover 22 .

[0047] Specifically, the opening of the buckle slot extends rearward to the rear end surface of the front shell 21 to correspond to the axial extension of the buckle.

[0048] Specifically, the second buckling portion 221 is provided with a latch tongue facing the inner wall of the first cavity to limit the movement of the rear cover 22 in the radial direction relative to the front shell 21 .

[0049] In other embodiments of the present application, the rear end face of the front shell 21 is provided with a positioning protrusion 214, and the positioning protrusion 214 and the first buckle portion 212 are staggered in the radial direction of the front shell 21; the rear cover 22 is provided with a notch 223, and the positioning protrusion 214 is inserted into the notch 223.

[0050] In this way, on the basis of the first buckling portion 212 and the second buckling portion 221 , the movement of the rear cover 22 relative to the front shell 21 is further restricted.

[0051] In some other embodiments of the present application, the number of the first buckling portions 212 and the number of the second buckling portions 221 are both at least two, and are evenly distributed along the circumference of the front shell 21 .

[0052] In this way, there is sufficient strength to limit the movement of the rear cover 22 relative to the front shell 21.

[0053] In some other embodiments of the present application, the first limiting structure 213 is clamped to the second limiting structure 222 along the axial direction of the front shell 21 .

[0054] In this way, the direction in which the rear cover 22 is installed to the front shell 21 is consistent, which is beneficial to the installation of the rear cover 22 and the front shell 21 .

[0055] In some other embodiments of the present application, the first limiting structure 213 includes a rib protruding from the inner wall of the front shell 21 , and the second limiting structure 222 includes a groove provided on the front side wall of the rear cover 22 .

[0056] Specifically, the ribs extend axially along the inner wall of the front shell 21. This is beneficial to the processing of the front shell 21. For example, the front shell 21 can be formed by an injection molding process, and the axially extending ribs are beneficial to demoulding and simplifying the mold structure.

[0057] In some other embodiments of the present application, a first annular boss 215 is provided at the rear of the front shell 21, and a second boss 224 is provided at the front side wall of the rear cover 22, and the second boss 224 is axially against the first boss 215;

[0058] The first limiting structure 213 protrudes from the first boss 215 in a direction toward the rear cover 22 , and the second limiting structure 222 is disposed on the second boss 224 .

[0059] It can be understood that the radial dimension of the second boss 224 corresponds to the first boss 215 , so that the second boss 224 abuts against the first boss 215 axially.

[0060] Specifically, the outer contour shape of the second protrusion in the radial direction is a circle corresponding to the ring shape of the first boss 215 .

[0061] It can be understood that the first boss 215 and the second boss 224 are also referred to as stop structures in some industries, the first boss 215 is a concave stop, and the second boss is a convex stop. In this way, the front and rear positions of the rear cover 22 and the front shell 21 during installation are limited by the stop structure.

[0062] In some other embodiments of the present application, there are at least three first limiting structures 213, which are evenly distributed along the circumference of the front shell 21, and the first limiting structures 213 and the first buckling parts 212 are staggered in the circumferential direction; the second limiting structures 222 are matched one by one with the first limiting structures 213.

[0063] In this way, there is sufficient strength to limit the rotation of the rear cover 22 relative to the front shell 21.

[0064] In some other embodiments of the present application, the front shell 21 includes a first shell segment 217 and a second shell segment 218 connected in sequence in the front-to-back direction, and the outer contour of the first shell segment 217 protrudes from the outer contour of the second shell segment 218; the first mounting portion 211 does not protrude from the outer contour of the first shell segment 217.

[0065] In this way, the outer contour size of the gear box 20 does not need to be increased due to the provision of the first mounting portion 211, which is beneficial for reducing the size of the housing 10 of the electric tool.

[0066] The present application also provides an electric tool, referring to Figure 1 , power tools include:

[0067] The housing 10 has a second cavity;

[0068] The gear box 20 described above is located in the second cavity; the inner wall of the housing 10 is provided with a second mounting portion 11 , and the second mounting portion 11 is connected to the first mounting portion 211 .

[0069] The electric tool of the embodiment of the present application improves the gear box 20, and a first mounting portion 211 mounted to the housing 10 is provided on the front housing 21 with a smaller outer periphery. Compared with a structure connected to the housing 10 provided on the rear cover 22, the outer profile of the gear box 20 can be made smaller, which is conducive to reducing the size of the housing 10 of the electric tool.

[0070] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes may be made on the basis of the above embodiments without departing from the scope disclosed in the present application. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the present application that may not be explicitly described. Therefore, the above embodiments only express several implementations of the present application and do not limit the scope of protection of the patent of this application.

Claims

1. A gear box, applied to an electric tool, characterized in that: The gearbox comprises: A front shell, which is provided with a first cavity for accommodating the reduction gear mechanism of the electric tool, and the front shell is provided with a first mounting portion, a first buckling portion, and a first limiting structure, wherein the first mounting portion is used to be mounted on the housing of the electric tool; A rear cover is arranged on the rear end surface of the front shell, and the rear cover is provided with a second buckling portion and a second limiting structure; the first buckling portion and the second buckling portion are buckled to limit the movement of the rear cover relative to the front shell; the first limiting structure and the second limiting structure cooperate to limit the rotation of the rear cover relative to the front shell.

2. The gearbox according to claim 1, characterized in that: The first buckle connection portion is a buckle groove provided on the inner wall of the front shell; the second buckle connection portion is a buckle extending along the axial direction of the rear cover.

3. The gearbox according to claim 2, characterized in that: The rear end surface of the front shell is provided with a positioning protrusion, and the positioning protrusion and the first buckle portion are staggered in the radial direction of the front shell; the rear cover is provided with a notch, and the positioning protrusion is inserted into the notch.

4. The gearbox according to claim 3, characterized in that: The number of the first buckling parts and the number of the second buckling parts are both at least two, and they are evenly distributed along the circumference of the front shell.

5. The gearbox according to any one of claims 1 to 4, characterized in that: The first limiting structure is clamped to the second limiting structure along the axial direction of the front shell.

6. The gearbox according to claim 5, characterized in that: The first limiting structure includes a rib protruding from the inner wall of the front shell, and the second limiting structure includes a groove provided on the front side wall of the rear cover.

7. The gearbox according to claim 6, characterized in that: The rear portion of the front shell is provided with a first annular boss, the front side wall of the rear cover is provided with a second boss, and the second boss is axially against the first boss; The first limiting structure protrudes from the first boss along a direction toward the rear cover, and the second limiting structure is disposed on the second boss.

8. The gearbox according to claim 5, characterized in that: There are at least three first limiting structures, which are evenly distributed along the circumference of the front shell, and the first limiting structures and the first buckling parts are staggered in the circumference; the second limiting structures are matched with the first limiting structures one by one.

9. The gearbox according to any one of claims 1 to 4, characterized in that: The front shell includes a first shell segment and a second shell segment connected in sequence in the front-to-back direction, the outer contour of the first shell segment protrudes from the outer contour of the second shell segment; the first mounting portion does not protrude from the outer contour of the first shell segment.

10. An electric tool, characterized in that: include: The housing has a second cavity; The gear box described in any one of claims 1 to 9 is located in the second cavity; the inner wall of the casing is provided with a second mounting portion, and the second mounting portion is connected to the first mounting portion.

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