CN220863922U - Front cover and electric tool with same - Google Patents

Abstract

The application relates to a front cover and an electric tool with the front cover, wherein the technical scheme comprises the following steps: a housing; a motor disposed within the housing; a transmission assembly at least partially disposed within the housing, the transmission assembly including an output shaft disposed at a front end of the housing; a front cover rotatably fixed to 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 work surface; and a groove which is arranged on the upper end surface and is communicated with the central hole. When the electric tool works, the front cover is abutted on the working surface, dust discharged from the working hole is discharged to the external space along the groove, dust is prevented from being accumulated in the central hole and entering the internal space from the central hole, abrasion is caused to the moving part, and therefore the service life of the electric tool is prolonged.

Description

Front cover and electric tool with same

Technical Field

The application relates to the technical field of tools, in particular to a front cover and an electric tool with the front cover.

Background

The electric tool is driven by electricity, and dust may be generated when a hammer is driven on a mineral material. After dust enters the electric tool, the dust can generate non-negligible abrasion action on moving parts in the electric tool, and damage to parts and even the whole machine is caused. When the electric tool is used, particularly when the front cover of the electric tool is abutted against the working surface, the rotary drill bit continuously brings out dust generated in the working hole and is accumulated between the front cover and the working surface, and the accumulated dust is easily brought into the electric tool by the rotary cutter, so that the moving parts are damaged.

Disclosure of utility model

Accordingly, it is necessary to provide a front cover and an electric tool having the same, for the problem that dust enters the inside of the machine.

In order to solve the technical problems, the application is realized as follows:

In one embodiment, a front cover for mating with a power tool having a mating rotary cutter, the front cover comprising: a main body portion; a central bore attached to the rotary cutter; an upper end surface which is abutted with the working surface; and the groove is formed in the upper end face and communicated with the central hole.

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

Optionally, the first expansion part is disposed at an end of the groove far away from the central hole, the first expansion part is communicated with the peripheral wall of the front cover, and the first expansion part is communicated with the upper end face.

Optionally, the first side wall of the groove is provided with a first shrinkage part, the width of the first shrinkage part gradually decreases outwards along the radial direction, the first shrinkage part is communicated with the upper end surface, the first shrinkage part is communicated with the central hole, and the arc length of the groove at the central hole is more than 60%.

Optionally, the groove further has a protrusion radially disposed between the first enlarged portion and the first contracted portion, the width of the groove at the protrusion being minimal.

Optionally, the groove has a first enlarged portion, the first enlarged portion is disposed at an end far from the center hole, the first enlarged portion is communicated with an outer peripheral wall of the front cover, and the first enlarged portion is communicated with the upper end face.

Optionally, the protruding portion is disposed on the first side wall, two ends of the first side wall are connected to form a connecting line, and the protruding portion is disposed on a side of the connecting line facing the groove.

Optionally, the groove extends obliquely in a radial direction to the rotation direction of the rotary cutter, the groove further comprising a second side wall extending at an angle of inclination of 0 ° to 60 ° at the central hole.

Optionally, the narrowest distance of the two side walls of the groove is greater than 1mm, the distance from the bottom surface of the groove to the upper end surface is greater than 1mm, the upper end surface is provided with an inclined surface, the inclined surface is arranged on one side close to the central hole, the distance from the inclined surface to the bottom surface of the groove is reduced towards the direction of the central hole, the main body part is in a truncated cone shape, the diameter of the main body part is gradually reduced in the direction close to the upper end surface, and the front cover is made of an elastic material.

The application discloses an electric tool, comprising: a housing; a motor disposed within the housing; a transmission assembly at least partially disposed within the housing, the transmission assembly including an output shaft disposed at a front portion of the housing; a front cover rotatably fixed to the output shaft; wherein, the front cover is the front cover.

Optionally, the motor further comprises a clamping ring, wherein the clamping ring is sleeved on an outer annular groove of the output shaft, an inner annular groove is formed in a central hole of the front cover, and the inner annular groove is sleeved with the clamping ring.

In the embodiment of the application, when the electric tool is operated, the front cover is abutted against the operation surface, the rotary drill bit continuously discharges dust from the inside of a workpiece and is guided to the external space through the groove on the front cover, so that the phenomenon that the dust enters the tool main machine from the central hole of the front cover is reduced, the possibility of abrasion phenomenon of moving parts in the electric tool is reduced, and the service life of the electric tool is prolonged.

Drawings

FIG. 1 is a schematic view of a front cover according to an embodiment of the present application;

FIG. 2 is a front view of a front cover in an embodiment of the application;

FIG. 3 is a front view of a front cover in another embodiment of the application;

FIG. 4 is a cross-sectional view of a portion of a power tool according to an embodiment of the present application;

fig. 5 is a partial cross-sectional view of a power tool in an embodiment of the application.

Description of the drawings: 10. a front cover; 11. a main body portion; 112. an outer peripheral wall; 113. an abutting portion; 1131. an upper end surface; 1131a, inclined surfaces; 12. a central bore; 121. an inner ring groove; 13. a groove; 131. a bottom surface; 132. a first sidewall; 133. a first constriction; 134. a first enlarged portion; 135. a protruding portion; 136. a second sidewall; 20. a housing; 30. a motor; 40. a transmission assembly; 41. an output shaft; 411. an outer ring groove; 42. a clasp; 50. rotating the cutter; a. a rotation direction; A. connecting wires; b. an inclination angle; 90. and (5) working holes.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the present application, unless explicitly specified and defined otherwise, the term "width" is to be understood as a feature centered on a central aperture, the length of the arc length of the circle being the width.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1, fig. 1 shows a schematic structural diagram of a front cover according to an embodiment of the present application, and an embodiment of the present application provides a front cover 10 for mating with a power tool, the power tool has a rotating tool that is mated, and the front cover 10 includes a main body 11, a central hole 12, an abutting portion 113, an upper end surface 1131, and a groove 13. The rotary cutter is rotatably attached to the central hole 12, the upper end surface 1131 is abutted to the working surface, the groove 13 is formed in the upper end surface 1131 and is communicated with the central hole 12, dust is discharged from the working hole 90 along with rotation of the rotary cutter 50, enters the groove 13 and is discharged into the outer space along with the groove 13, so that dust can be prevented from being accumulated in the central hole 12, dust can be prevented from entering the tool from the central hole 12 along with rotation of the rotary cutter, non-negligible abrasion is caused to moving parts, and the service life of the tool is prolonged.

Referring to fig. 2 and 3, fig. 2 shows a front view of a front cover in an embodiment of the present application, and fig. 3 shows a front view of a front cover in another embodiment of the present application, in some preferred embodiments, the groove 13 has a first enlarged portion 134, and the width of the first enlarged portion 134 gradually increases radially outward, and the groove 13 is at least partially provided with the first enlarged portion 134 in the radial direction, and it is understood that the first enlarged portion 13 may be disposed only on one side of the first sidewall 132, only on one side of the second sidewall 136, or both on the first sidewall 132 and the second sidewall 136, so that the channel gradually increases with the discharging direction of dust, avoiding the dust from being blocked in the groove 13, and making the discharging of dust more unobstructed.

In some preferred embodiments, the first enlarged portion 134 is disposed at an end of the recess 13 remote from the central hole 12, the first enlarged portion 134 communicates with the upper end surface 1131, and the first enlarged portion 134 communicates with the peripheral wall 112, so that a dust discharge port of the recess 13 can be enlarged, and dust can be discharged as soon as possible, avoiding clogging of the recess 13 with dust.

In some preferred embodiments, the recess 13 has a first sidewall 132, the first sidewall 132 being the first sidewall of the rotary cutter 50 as it passes the recess 13 in the direction of rotation a, the first sidewall 132 having a first constriction 133, the width of the first constriction 133 tapering radially outwardly, it being understood that the width of the first constriction 133 is greatest at the central aperture 12, such that the entrance of the recess 13 at the central aperture 12 may be increased; the first constriction 133 communicates with the central hole 12, and when the rotary cutter 50 rotates, dust discharged along the working hole 90 can be discharged into the first constriction 133 in advance and then enter the groove 13, so that dust at the central hole 12 can be reduced, dust is prevented from accumulating in the central hole 12, and enters the interior of the tool; the first constriction 133 communicates with the upper end surface 1131, and when the rotary cutter rotates, part of the dust pressed between the upper end surface 1131 and the working surface can be discharged into the first constriction 133 in advance and then enter the groove 13, so that the dust at the central hole 12 can be reduced, and the dust is prevented from entering the interior of the tool from the central hole 12; preferably, the first constriction 133 communicates with the central hole 12, and the first constriction 133 communicates with the upper end surface 1131, so that the entrance of dust in the working hole 90 into the recess 13 can be increased, and the discharge of dust can be accelerated.

In some preferred embodiments, the recess 13 further has a protrusion 135, the protrusion 135 being radially disposed between the first enlarged portion 134 and the first contracted portion 133, and the width of the recess 13 at the protrusion 135 is minimized, so that hot gas is generated due to friction when the rotary cutter 50 rotates, and dust is accelerated to pass through the recess 13 while passing through the recess 13 where the protrusion 135 is located, thereby avoiding accumulation of dust.

In some preferred embodiments, the protrusion 135 is disposed on the first sidewall 132, and the two ends of the first sidewall 132 are connected to form a connection line a, and the protrusion 135 is disposed on a side of the connection line a facing the groove 13, so that dust can be accelerated to pass through the protrusion 135 while passing through the groove 13.

In some preferred embodiments, the grooves 13 extend obliquely in the radial direction to the direction of rotation a of the rotary cutter. The rotation direction a of the rotary cutter is counterclockwise, and thus, the groove 13 extends counterclockwise in the radial direction; similarly, when the rotation direction a of the rotary cutter is clockwise, the groove 13 extends clockwise in the radial direction. During operation, the front cover 10 is abutted and fixed on the operation surface, the rotary cutter and the front cover 10 rotate relatively, and when dust is discharged from the operation hole 90, centrifugal movement is performed along the rotation direction a, and the grooves 13 extending obliquely along the rotation direction a are beneficial to discharging the dust; the groove 13 extends at the center hole 12 at an inclination angle b of 0 to 60 so that dust enters the groove 13 from the center hole 12 of the groove 13, and at the same time, the length of the groove 13 in the main body 11 can be reduced as the inclination angle b is reduced, so that dust in centrifugal motion can be rapidly discharged along the groove 13.

In some preferred embodiments, the narrowest distance of the two sidewalls of the recess 13 is greater than 1mm, and the minimum distance from the bottom surface 131 of the recess 13 to the upper end surface 1131 is greater than 1mm, so that, during operation, the greater width allows larger particles of dust to enter the recess 13 and a greater amount of dust to enter the recess 13, thereby facilitating the discharge of dust from the working hole 90 and avoiding the entry of dust from the central hole 12 into the interior of the tool; the upper end surface 1131 has an inclined surface 1131a, the inclined surface 1131a is arranged at one side close to the central hole 12, and the distance from the inclined surface 1131a to the bottom surface 131 of the groove 13 is reduced towards the direction of the central hole 12, so that when larger dust is blocked at the inlet of the groove 13, the dust can be discharged from the next groove 13 after passing over the inclined surface 1131a along with the rotation of the rotary cutter, thereby facilitating the discharge of the 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 to the upper end surface 1131, so that the overall strength of the front cover 10 can be ensured, deformation caused by strong extrusion can be avoided, the length of the groove 13 can be shortened, dust can be discharged as soon as possible, and the dust is prevented from being blocked in the groove 13; the front cover 10 is made of an elastic material such as rubber, elastic plastic, or the like, so that abrasion of the front cover 10 at the time of collision of the front cover 10 with the work surface can be reduced, and thus, the service life of the front cover 10 can be prolonged.

Referring to fig. 4 and 5, fig. 4 shows a sectional view of a portion of an electric tool in an embodiment of the present application, fig. 5 shows a sectional view of a portion of the electric tool in an embodiment of the present application, the electric tool includes a housing 20, a motor 30 is disposed in the housing 20, a transmission assembly 40 is at least partially disposed in the housing 20, the transmission assembly 20 includes an output shaft 41 disposed at a front portion of the housing, the transmission assembly 40 transmits a driving force of the motor 30 to the output shaft 41 for a rotational movement, the output shaft 41 drives a rotary cutter 50 to rotate, a front cover 10 is rotatably fixed on the output shaft 41, and the electric tool is operated to fix the front cover 10 on a working surface in an abutting manner, at this time, the front cover 10 and the rotary cutter 50 are relatively rotated, so that dust is discharged from the working hole 90 and discharged to an external space through a groove 13, a phenomenon that the dust enters into an internal space of the electric tool along the center hole 12 is reduced, and a service life of the electric tool is prolonged.

In some preferred embodiments, the electric tool further includes a snap ring 42, the snap ring 42 is sleeved on the outer ring slot 411 of the output shaft 41, the central hole 12 of the front cover is provided with an inner ring slot 121, and the inner ring slot 121 is sleeved on the snap ring 42.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. A front cover for mating with a power tool having a mating rotary cutter, the front cover comprising:

A main body (11);

A central bore (12) attached to the rotary cutter;

An upper end surface (1131) that is in contact with the work surface;

And a groove (13) which is formed on the upper end surface (1131) and is communicated with the central hole (12).

2. Front cover according to claim 1, characterized in that the recess (13) has a first enlargement (134), the width of the first enlargement (134) increasing gradually radially outwards.

3. Front cover according to claim 2, characterized in that the first enlargement (134) is provided at the end of the recess (13) remote from the central aperture (12), the first enlargement (134) being in communication with the peripheral wall (112) of the front cover, the first enlargement (134) being in communication with the upper end face (1131).

4. A front cover according to claim 3, characterized in that the first side wall (132) of the recess (13) has a first constriction (133), the width of the first constriction (133) gradually decreasing radially outwards, the first constriction (133) being in communication with the upper end face (1131), the first constriction (133) being in communication with the central aperture (12), the arc length of the recess (13) at the central aperture (12) being more than 60%.

5. Front cover according to claim 4, characterized in that the recess (13) further has a bulge (135), which bulge (135) is arranged radially between the first enlargement (134) and the first constriction (133), the width of the recess (13) being smallest at the bulge (135).

6. Front cover according to claim 5, characterized in that the protruding part (135) is arranged on the first side wall (132), a connecting line (a) is formed at two ends of the first side wall (132), and the protruding part (135) is arranged at one side of the connecting line (a) facing the groove (13).

7. Front cover according to claim 1, characterized in that the recess (13) extends obliquely in a radial direction to the direction of rotation of the rotary cutter, the recess (13) further comprising a second side wall (136), the second side wall (136) extending at the central hole (12) at an angle of inclination of 0 ° to 60 °.

8. Front cover according to any of claims 1 to 7, characterized in that the narrowest distance of the two side walls of the recess (13) is greater than 1mm, the maximum distance of the bottom surface (131) of the recess (13) to the upper end surface (1131) is greater than 1mm, the upper end surface (1131) has an inclined surface (1131 a), the inclined surface (1131 a) is arranged on the side close to the central hole (12), and the distance of the inclined surface (1131 a) to the bottom surface (131) of the recess (13) decreases towards the central hole (12), the main body part (11) has a truncated cone shape, the diameter of which decreases gradually in the direction approaching the upper end surface (1131), and the front cover is made of an elastic material.

9. A power tool, comprising:

A housing (20);

a motor (30) disposed within the housing (20);

A transmission assembly (40) disposed at least partially within the housing (20), the transmission assembly (40) including an output shaft (41) disposed at a front portion of the housing (20);

A front cover rotatably fixed to the output shaft (41);

Wherein the front cover is the front cover according to any one of claims 1 to 8.

10. The electric tool according to claim 9, further comprising a snap ring (42), wherein the snap ring (42) is sleeved on an 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 snap ring (42).