Front cover and electric tool with same

Abstract

The invention relates to a front cover and an electric tool with the same. According to the technical scheme, the front cover comprises a shell; the motor is arranged in the shell; at least part of the transmission assembly is arranged in the shell, and the transmission assembly comprises an output shaft arranged at the front end of the shell; the front cover is rotatably fixed on the output shaft; the front cover includes: a main body portion; a central bore attached to the rotary cutter; an upper end surface abutting against the working surface; the groove is formed in the upper end face and communicated with the center hole. When the electric tool works, the front cover abuts against the working face, dust discharged from the working hole is discharged to the external space along the groove, the dust is prevented from being accumulated in the center hole and entering the internal space from the center hole to abrade moving parts, and therefore the service life of the electric tool is prolonged.

Description

Technical Field

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

[0002] Power tools are driven by electricity and may generate dust when they are chiseling and hammering on mineral materials. Once dust enters the interior of the power tool, it will have a significant abrasive effect on the internal moving parts, causing damage to parts or even the entire machine. When the power tool is in use, especially when the front cover of the power tool is against the working surface, the rotating drill bit continuously brings out the dust generated in the working hole and accumulates between the front cover and the working surface. The accumulated dust is easily brought into the interior of the power tool by the rotating tool, causing damage to the moving parts. Summary of the invention

[0003] Based on this, it is necessary to provide a front cover and an electric tool having the same to address the problem of dust entering the interior of the machine.

[0004] In order to solve the above technical problems, this application is implemented as follows: In one embodiment, a front cover is provided for coupling with an electric tool having a coupled rotating tool. The front cover comprises: a main body; a center hole to which the rotating tool is attached; an upper end surface to which abuts a working surface; and a groove formed on the upper end surface and connected to the center hole.

[0005] Optionally, the groove has a first enlarged portion, and a width of the first enlarged portion gradually increases radially outward.

[0006] Optionally, the first enlarged portion is arranged at the end of the groove away from the central hole, the first enlarged portion is connected to the outer peripheral wall of the front cover, and the first enlarged portion is connected to the upper end surface.

[0007] Optionally, the first side wall of the groove has a first contraction portion, the width of the first contraction portion gradually decreases radially outward, the first contraction portion is connected to the upper end surface, the first contraction portion is connected to the center hole, and the arc length of the groove at the center hole accounts for more than 60%.

[0008] Optionally, the groove further has a protruding portion, the protruding portion is radially arranged between the first expansion portion and the first contraction portion, and the width of the groove is smallest at the protruding portion.

[0009] Optionally, the groove has a first enlarged portion, the first enlarged portion is arranged at an end away from the center hole, the first enlarged portion is connected to the outer peripheral wall of the front cover, and the first enlarged portion is connected to the upper end surface.

[0010] Optionally, the protrusion is arranged on the first side wall, two ends of the first side wall are connected to form a connecting line, and the protrusion is arranged on a side of the connecting line facing the groove.

[0011] Optionally, the groove extends radially and obliquely toward the rotation direction of the rotating tool, and the groove further includes a second side wall, and the extension inclination angle of the second side wall at the center hole is 0° to 60°.

[0012] Optionally, the narrowest distance between the two side walls of the groove is greater than 1 mm, the distance from the bottom surface of the groove to the upper end surface is greater than 1 mm, the upper end surface has an inclined surface, the inclined surface is arranged on the side close to the center hole, and the distance from the inclined surface to the bottom surface of the groove decreases toward the center hole, the main body is frustum-shaped, and its diameter gradually decreases in the direction approaching the upper end surface, and the front cover is made of elastic material.

[0013] An electric tool disclosed in the present application includes: a housing; a motor, which is arranged in the housing; a transmission assembly, which is at least partially arranged in the housing, and the transmission assembly includes an output shaft arranged in the front part of the housing; a front cover, which is rotatably fixed on the output shaft; wherein the front cover is the above-mentioned front cover.

[0014] Optionally, a retaining ring is further included, and the retaining ring is sleeved on the outer ring groove of the output shaft. The center hole of the front cover is provided with an inner ring groove, and the inner ring groove is sleeved on the retaining ring.

[0015] In the embodiment of the present application, when the power tool is operating, the front cover abuts against the working surface, and the rotating drill bit continuously discharges dust from inside the workpiece and guides it to the external space through the groove on the front cover, thereby reducing the phenomenon of dust entering the tool main body through the center hole of the front cover, reducing the possibility of abrasion of the internal moving parts of the power tool, and thus extending the service life of the power tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the front cover in one embodiment of the present application; Figure 2 A front view of a front cover in one embodiment of the present application; Figure 3 A front view of a front cover in another embodiment of the present application; Figure 4 A cross-sectional view of a portion of an electric tool in an embodiment of the present application in a working state; Figure 5 It is a partial cross-sectional view of an electric tool in one embodiment of the present application. Description of the drawings: 10, front cover; 11, main body; 112, outer peripheral wall; 113, abutment portion; 1131, upper end surface; 1131a, inclined surface; 12, center hole; 121, inner ring groove; 13, groove; 131, bottom surface; 132, first side wall; 133, first contraction portion; 134, first expansion portion; 135, protrusion; 136, second side wall; 20, outer shell; 30, motor; 40, transmission assembly; 41, output shaft; 411, outer ring groove; 42, retaining ring; 50, rotating tool; a, rotation direction; A, connecting line; b, tilt angle; 90, working hole. Implementation

[0017] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0018] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0019] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0020] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it 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 this application can be understood according to specific circumstances.

[0021] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0022] In the present application, unless otherwise clearly specified and limited, the term "width" should be understood as the length of the arc length of a circle centered on the central hole of a certain feature.

[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0024] See also Figure 1FIG. 1 shows a schematic diagram of the structure of the front cover in an embodiment of the present application. The front cover 10 provided in an embodiment of the present application is used to match with an electric tool. The electric tool has a matching rotary tool. The front cover 10 includes a main body 11, a center hole 12, an abutment portion 113, an upper end surface 1131, and a groove 13. The rotary tool is rotatably attached to the center hole 12, the upper end surface 1131 abuts against the working surface, and the groove 13 is opened on the upper end surface 1131 and communicated with the center hole 12. Dust is discharged from the working hole 90 with the rotation of the rotary tool 50, enters the groove 13, and is discharged to the external space with the groove 13. In this way, dust can be prevented from accumulating in the middle hole 12, and dust can be prevented from entering the tool from the center hole 12 with the rotation of the rotary tool, causing non-negligible abrasion to the moving parts, thereby extending the service life of the tool.

[0025] See also Figure 2 and Figure 3 FIG2 shows a front view of the front cover in one embodiment of the present application, and FIG3 shows a front view of the front cover in another embodiment of the present application. In some preferred embodiments, the groove 13 has a first expansion portion 134, and the width of the first expansion portion 134 gradually increases radially outward, and the groove 13 is at least partially provided with the first expansion portion 134 in the radial direction. At the same time, it can be understood that the first expansion portion 13 can be provided only on one side of the first side wall 132, can be provided only on one side of the second side wall 136, or can be provided on both the first side wall 132 and the second side wall 136. In this way, the channel gradually increases along the discharge direction of the dust, avoiding dust clogging in the groove 13 and making the dust discharge more unobstructed.

[0026] In some preferred embodiments, the first expansion portion 134 is arranged at the end of the groove 13 away from the center hole 12, the first expansion portion 134 is connected to the upper end surface 1131, and the first expansion portion 134 is connected to the outer peripheral wall 112. In this way, the dust discharge port of the groove 13 can be enlarged, and the dust can be discharged as soon as possible to avoid dust clogging the groove 13.

[0027] In some preferred embodiments, the groove 13 has a first side wall 132, which is the first side wall when the rotating tool 50 passes through the groove 13 along the rotation direction a. The first side wall 132 has a first contraction portion 133, and the width of the first contraction portion 133 gradually decreases radially outward. It can be understood that the width of the first contraction portion 133 is the largest at the center hole 12, which can increase the entrance of the groove 13 at the center hole 12; the first contraction portion 133 is connected to the center hole 12, and when the rotating tool 50 rotates, the dust discharged along the working hole 90 can be discharged into the first contraction portion 133 in advance, and then enter the groove 13, which can reduce The first contraction portion 133 is connected with the upper end face 1131, and when the rotary tool rotates, part of the dust squeezed between the upper end face 1131 and the working surface can be discharged into the first contraction portion 133 in advance, and then enter the groove 13, which can reduce the dust at the center hole 12 and prevent the dust from entering the tool from the center hole 12; preferably, the first contraction portion 133 is connected with the center hole 12, and the first contraction portion 133 is connected with the upper end face 1131, which can increase the entrance of the dust in the working hole 90 into the groove 13 and accelerate the discharge of dust.

[0028] In some preferred embodiments, the groove 13 also has a protrusion 135, which is radially arranged between the first expansion portion 134 and the first contraction portion 133. The width of the groove 13 at the protrusion 135 is the smallest. In this way, when the rotating tool 50 rotates, hot gas is generated due to frictional heat. When passing through the groove 13 where the protrusion 135 is located, it can accelerate the dust to pass through the groove 13 to avoid dust accumulation.

[0029] In some preferred embodiments, the protrusion 135 is arranged on the first side wall 132, and the two ends of the first side wall 132 are connected to form a line A. The protrusion 135 is arranged on the side of the line A facing the groove 13, so that the dust can be accelerated at the protrusion 135 when passing through the groove 13.

[0030] In some preferred embodiments, the groove 13 extends radially and obliquely toward the rotation direction a of the rotary tool. The rotation direction a of the rotary tool is counterclockwise, so the groove 13 extends radially and counterclockwise; similarly, when the rotation direction a of the rotary tool is clockwise, the groove 13 extends radially and clockwise. During operation, the front cover 10 is abutted and fixed on the working surface, and the rotary tool and the front cover 10 rotate relative to each other. When the dust is discharged from the working hole 90, it performs centrifugal motion along the rotation direction a. The groove 13 extending obliquely along the rotation direction a is conducive to the discharge of dust; the extension inclination angle b of the groove 13 at the center hole 12 is 0° to 60°, which is convenient for dust to enter the groove 13 from the center mouth 12 of the groove 13. At the same time, as the inclination angle b decreases, the length of the groove 13 in the main body 11 can be reduced, so that the dust performing centrifugal motion can be quickly discharged along the groove 13.

[0031] In some preferred embodiments, the narrowest distance between the two side walls of the groove 13 is greater than 1 mm, and the minimum distance from the bottom surface 131 of the groove 13 to the upper end surface 1131 is greater than 1 mm. In this way, during operation, the larger width can allow larger particles of dust to enter the groove 13, and can allow a large amount of dust to enter the groove 13, thereby facilitating the discharge of dust from the working hole 90 and preventing dust from entering the interior of the tool from the center hole 12; the upper end surface 1131 has an inclined surface 1131a, and the inclined surface 1131a is arranged on a side close to the center hole 12, and the distance from the inclined surface 1131a to the bottom surface 131 of the groove 13 decreases toward the direction of the center hole 12, so that it can be blocked by larger dust. At the entrance of the groove 13, the dust passes over the inclined surface 1131a as the rotating tool rotates, and is discharged from the next groove 13, which is beneficial to the discharge of dust; the main body 11 is in a truncated cone shape, and the diameter of the main body 11 gradually decreases in the direction approaching the upper end surface 1131. In this way, the overall strength of the front cover 10 can be guaranteed and deformation due to strong extrusion can be prevented, and the length of the groove 13 can be shortened, so that the dust can be discharged as soon as possible and the dust can be prevented from being blocked in the groove 13; the front cover 10 is made of elastic material, such as rubber, elastic plastic and other materials. In this way, the wear on the front cover 10 when the front cover 10 collides with the working surface can be reduced, thereby extending the service life of the front cover 10.

[0032] See also Figure 4 and Figure 5 , Figure 4 A cross-sectional view showing a working state of a part of an electric tool in an embodiment of the present application is shown. Figure 5A partial cross-sectional view of an electric tool in an embodiment of the present application is shown, the electric tool includes a housing 20, a motor 30 is arranged in the housing 20, a transmission assembly 40 is at least partially arranged in the housing 20, the transmission assembly 20 includes an output shaft 41 arranged at the front of the housing, the transmission assembly 40 transmits the driving force of the motor 30 to the output shaft 41 for rotational motion, the output shaft 41 drives the rotating tool 50 to rotate, the front cover 10 is rotatably fixed on the output shaft 41, the electric tool is operated to abut and fix the front cover 10 on the working surface, at this time, the front cover 10 and the rotating tool 50 rotate relative to each other, so that dust is discharged from the working hole 90 and discharged to the external space through the groove 13, thereby reducing the phenomenon of dust entering the internal space of the electric tool along the center hole 12, thereby extending the service life of the electric tool.

[0033] In some preferred embodiments, the electric tool further includes a retaining ring 42 , which is sleeved on the outer ring groove 411 of the output shaft 41 . The center hole 12 of the front cover is provided with an inner ring groove 121 , and the inner ring groove 121 is sleeved on the retaining ring 42 .

[0034] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A front cover for coupling with an electric tool, wherein the electric tool has a coupled rotary tool, characterized in that: The front cover comprises: Main body (11); a central hole (12) for attaching a rotating tool; An upper end surface (1131) abuts against a working surface; The groove (13) is formed on the upper end surface (1131) and is connected to the central hole (12).

2. The front cover according to claim 1, characterized in that: The groove (13) has a first enlarged portion (134), and the width of the first enlarged portion (134) gradually increases radially outwards.

3. The front cover according to claim 2, characterized in that: The first enlarged portion (134) is arranged at an end of the groove (13) away from the central hole (12), the first enlarged portion (134) is connected to the outer peripheral wall (112) of the front cover, and the first enlarged portion (134) is connected to the upper end surface (1131).

4. The front cover according to claim 3, characterized in that: The first side wall (132) of the groove (13) has a first contraction portion (133), the width of the first contraction portion (133) gradually decreases radially outward, the first contraction portion (133) is connected to the upper end surface (1131), the first contraction portion (133) is connected to the center hole (12), and the arc length of the groove (13) at the center hole (12) accounts for more than 60%.

5. The front cover according to claim 4, characterized in that: The groove (13) further comprises a protruding portion (135), wherein the protruding portion (135) is radially arranged between the first enlarged portion (134) and the first contracted portion (133), and the width of the groove (13) is smallest at the protruding portion (135).

6. The front cover according to claim 5, characterized in that: The protruding portion (135) is arranged on the first side wall (132), two ends of the first side wall (132) are connected to form a connecting line (A), and the protruding portion (135) is arranged on a side of the connecting line (A) facing the groove (13).

7. The front cover according to claim 1, characterized in that: The groove (13) extends radially and obliquely in the direction of rotation of the rotating tool. The groove (13) further comprises a second side wall (136). The extending oblique angle of the second side wall (136) at the center hole (12) is 0° to 60°.

8. The front cover according to any one of claims 1 to 7, characterized in that: The narrowest distance between the two side walls of the groove (13) is greater than 1 mm, the maximum distance between the bottom surface (131) of the groove (13) and the upper end surface (1131) is greater than 1 mm, the upper end surface (1131) has an inclined surface (1131a), the inclined surface (1131a) is arranged on a side close to the center hole (12), and the distance from the inclined surface (1131a) to the bottom surface (131) of the groove (13) decreases in the direction of the center hole (12), the main body (11) is in a truncated cone shape, and its diameter gradually decreases in a direction close to the upper end surface (1131), and the front cover is made of elastic material.

9. An electric tool, characterized in that: include: Shell (20); A motor (30) is disposed in the housing (20); A transmission assembly (40) at least partially disposed within the housing (20), the transmission assembly (40) comprising an output shaft (41) disposed at the front portion of the housing (20); A front cover rotatably fixed on the output shaft (41); Wherein, the front cover is the front cover as described in any one of claims 1 to 8.

10. The electric tool according to claim 9, characterized in that: It also comprises a snap ring (42), the snap ring (42) being sleeved on the outer ring groove (411) of the output shaft (41), the central hole (12) of the front cover being provided with an inner ring groove (121), the inner ring groove (121) being sleeved on the snap ring (42).

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