CN115870930A

CN115870930A - Electric tool

Info

Publication number: CN115870930A
Application number: CN202211733923.9A
Authority: CN
Inventors: 傅珂珂; 舒华勇
Original assignee: Zhejiang Matt Tools Co ltd
Current assignee: Zhejiang Matt Tools Co ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-03-31
Also published as: WO2024131036A1

Abstract

The invention relates to an electric tool, which comprises a cylinder, a reciprocating piston, a reciprocating power assembly and an impact assembly. Reciprocating power component includes power supply, reciprocating shaft and moving part, and power supply drive reciprocating shaft rotates, and the moving part drives reciprocating piston and moves on reciprocating guide rail for the moving part can be at the motion between the crest and the trough that are curved form guide rail, in order to realize reciprocating piston along reciprocating shaft's axis direction reciprocating motion's in the first cavity of cylinder purpose. Because the radial dimension of the first cavity is larger than that of the second cavity, and the part of the impact assembly is arranged in the second cavity, the reciprocating piston can compress the medium in the first cavity to enter the second cavity so as to impact the impact assembly, and the impact assembly can perform impact motion along the axial direction of the reciprocating shaft. Above-mentioned electric tool can increase the medium volume of advancing of second cavity under the short stroke of reciprocating piston, and then increases the impulsive force ability to assaulting the subassembly, is favorable to miniaturized design.

Description

Electric tool

Technical Field

The invention relates to the technical field of tools, in particular to an electric tool.

Background

Electric tools such as electric hammers, electric picks and the like are widely applied to drilling, crushing and other work in production and life, and the electric tools such as the electric hammers, the electric picks and the like compress gas to impact a working head by utilizing the principle of piston motion so as to enable the working head to realize the purpose of impact motion. However, the output power of the conventional electric power tool is generally not large, and if the output power is increased, the volume of the electric power tool is increased, which is not favorable for the requirement of portability and miniaturization.

Disclosure of Invention

In view of the above, it is desirable to provide an electric power tool that can improve the punching capability and is advantageous for the miniaturization of the design.

An electric tool comprises a cylinder, a reciprocating piston, a reciprocating power assembly and an impact assembly, wherein a first cavity and a second cavity which are communicated along the axial direction are formed in the cylinder, and the radial size of the first cavity is larger than that of the second cavity; the reciprocating piston is arranged in the first cavity; the reciprocating power assembly comprises a reciprocating shaft, a moving body and a power source, wherein a reciprocating guide rail is arranged on the reciprocating shaft, the reciprocating guide rail is a closed curve-shaped guide rail surrounding the axis of the reciprocating shaft, and the wave crests and the wave troughs of the curve-shaped guide rail are arranged at intervals along the axis of the reciprocating shaft; the moving body is limited on the reciprocating piston and can move on the reciprocating guide rail; the power source is used for driving the reciprocating shaft to rotate so that the moving body drives the reciprocating piston to reciprocate along the axial direction of the reciprocating shaft, the reciprocating piston is used for compressing a medium in the first cavity to the second cavity, and the axial direction of the reciprocating shaft is the direction from the first cavity to the second cavity; and part of the impact assembly is arranged in the second cavity, and the impact assembly can perform impact motion along the axial direction of the reciprocating shaft.

In one embodiment, the cylinder includes a first cylinder portion and a second cylinder portion, the second cylinder portion is connected to the first cylinder portion, the first cavity is formed in the first cylinder portion, the second cavity is formed in the second cylinder portion, and an outer diameter of the first cylinder portion is larger than an outer diameter of the second cylinder portion.

In one embodiment, the second cylinder portion is integrally formed on the first cylinder portion.

In one embodiment, the axial dimension of the first cavity is smaller than the axial dimension of the second cavity.

In one embodiment, the reciprocating piston comprises a piston body and a reciprocating part, the piston body is arranged in the first cavity in a penetrating mode, the piston body is connected with the reciprocating part, one side, back to the piston body, of the reciprocating part is provided with a containing cavity, the inner wall of the containing cavity is provided with a limiting groove, and the reciprocating shaft is arranged in the containing cavity in a penetrating mode so that the moving body is limited in the limiting groove.

In one embodiment, the piston body is integrally formed on the reciprocative part.

In one embodiment, the electric power tool further includes a mounting case, a mounting space is formed in the mounting case, the cylinder is mounted on the mounting case, so that the mounting space is communicated with a side of the first cavity opposite to the second cavity, and the reciprocating portion and the reciprocating shaft are located in the mounting space.

In one embodiment, the reciprocating guide rail is a reciprocating groove, the reciprocating groove is a closed curve-shaped groove surrounding the axis of the reciprocating shaft, the moving body is a sphere, the moving body is limited between the inner wall of the reciprocating groove and the inner wall of the limiting groove, and the moving body can roll in the reciprocating groove.

In one embodiment, the impact assembly comprises an impact hammer and a working head, the impact hammer is arranged in the second cavity, the working head is installed at one end, back to the first cavity, of the air cylinder, and the impact hammer can reciprocate in the second cavity to impact the working head.

In one embodiment, the cylinder is provided with an air supplementing hole and an air outlet hole, the air outlet hole is communicated with the position of the second cavity far away from the first cavity, the air supplementing hole is communicated with the first cavity or communicated with the position of the second cavity close to the first cavity, and the impact hammer can be positioned between the air supplementing hole and the air outlet hole.

Above-mentioned electric tool, when using, power supply drive reciprocating shaft rotates, and the moving part drives reciprocating piston and moves on reciprocating guide rail, and then makes the moving part can be at the motion between the crest and the trough that is the curvilinear figure guide rail to realize reciprocating piston along the axis direction reciprocating motion's of reciprocating shaft purpose in the first cavity of cylinder. Because the radial dimension of the first cavity is larger than that of the second cavity, and the part of the impact assembly is arranged in the second cavity, the reciprocating piston can compress the medium in the first cavity to enter the second cavity so as to impact the impact assembly, and the impact assembly can perform impact motion along the axial direction of the reciprocating shaft.

The electric tool can avoid the problem of a deflection angle caused by reciprocating movement of a crank structure or an eccentric driving structure by utilizing the reciprocating guide rail on the reciprocating shaft, and further avoid the problem of friction acting of deflection force caused by the deflection angle. The reciprocating power assembly is utilized to convert the rotary motion of the reciprocating shaft into the linear motion of the reciprocating piston, so that the deflection intersection cannot occur, and the working stability is better. Through the radial dimension of the first cavity is larger than that of the second cavity, the medium inlet quantity of the second cavity can be increased under the condition of a short stroke of the reciprocating piston, and the impact force capacity on the impact assembly is further increased. Therefore, the electric tool can improve the impact capacity on the premise of ensuring the miniaturization design.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of an electric power tool according to an embodiment;

FIG. 2 is a cross-sectional view of the power tool shown in FIG. 1;

FIG. 3 is an enlarged view of a portion of the power tool shown in FIG. 2;

FIG. 4 is a partially exploded view of the power tool of FIG. 1 with the impact assembly omitted;

FIG. 5 is a schematic illustration of the structure of the reciprocating piston of FIG. 4;

FIG. 6 is a schematic view of the cylinder of FIG. 4;

fig. 7 is a sectional view of the cylinder shown in fig. 6.

10. An electric tool; 100. a cylinder; 110. a first cavity; 120. a second cavity; 130. a first cylinder section; 140. a second cylinder section; 150. air hole supplement; 160. an air outlet; 170. a suction hole; 200. a reciprocating piston; 210. a piston body; 220. a reciprocating part; 221. an accommodating cavity; 222. a limiting groove; 230. a mating structure; 300. a reciprocating power assembly; 310. a reciprocating shaft; 311. a reciprocating groove; 320. a moving body; 330. a power source; 340. a rolling limit piece; 400. an impact assembly; 410. an impact hammer; 420. a working head; 500. mounting a shell; 510. an installation space; 520. and a guide structure.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Referring to fig. 1 to 3, the electric power tool 10 according to an embodiment of the present invention can improve the impact capability at least while ensuring miniaturization.

Specifically, the electric tool 10 comprises a cylinder 100, a reciprocating piston 200, a reciprocating power assembly 300 and an impact assembly 400, wherein a first cavity 110 and a second cavity 120 which are communicated along the axial direction are formed in the cylinder 100, and the radial dimension of the first cavity 110 is larger than that of the second cavity 120; a reciprocating piston 200 is disposed within the first cavity 110. The reciprocating power assembly 300 is used for driving the reciprocating piston 200 to reciprocate in the first cavity 110 along the axial direction, and the reciprocating piston 200 is used for compressing the medium in the first cavity 110 to the second cavity 120. Part of the impact assembly 400 is disposed within the second cavity 120 and the impact assembly 400 is capable of an impact motion in an axial direction.

Since the radial dimension of the first cavity 110 is larger than the radial dimension of the second cavity 120 and the portion of the impact assembly 400 is disposed in the second cavity 120, the reciprocating piston 200 can compress the medium in the first cavity 110 into the second cavity 120 to impact the impact assembly 400, thereby achieving an impact motion of the impact assembly 400 in the axial direction. By having the radial dimension of first cavity 110 be greater than the radial dimension of second cavity 120, the amount of medium admitted to second cavity 120 can be increased at shorter strokes of reciprocating piston 200, thereby increasing the impulsive force capability of impact assembly 400.

Referring to fig. 2 to 4, in an embodiment, the reciprocating power assembly 300 includes a reciprocating shaft 310, a moving body 320 and a power source 330, wherein a reciprocating guide rail is disposed on the reciprocating shaft 310, the reciprocating guide rail is a closed curve-shaped guide rail surrounding an axis of the reciprocating shaft 310, and peaks and valleys of the curve-shaped guide rail are spaced along the axis of the reciprocating shaft 310; the moving body 320 is limited on the reciprocating piston 200 and can move on the reciprocating guide rail; the power source 330 is used for driving the reciprocating shaft 310 to rotate, so that the moving body 320 drives the reciprocating piston 200 to reciprocate along the axial direction of the reciprocating shaft 310, wherein the axial direction of the reciprocating shaft 310 is the direction from the first cavity 110 to the second cavity 120; the impact assembly 400 is capable of performing an impact motion along the axial direction of the reciprocating shaft 310.

When the reciprocating piston type air cylinder is used, the power source 330 drives the reciprocating shaft 310 to rotate, and the moving body 320 drives the reciprocating piston 200 to move on the reciprocating guide rail, so that the moving body 320 can move between the wave crest and the wave trough of the curved guide rail, and the purpose that the reciprocating piston 200 reciprocates in the first cavity 110 of the air cylinder 100 along the axial direction of the reciprocating shaft 310 is achieved. The reciprocating piston 200 can compress the medium in the first cavity 110 into the second cavity 120 to impact the impact assembly 400, thereby achieving an impact motion of the impact assembly 400 along the axial direction of the reciprocating shaft 310. The reciprocating guide rail on the reciprocating shaft 310 can avoid the problem of a deflection angle caused by reciprocating movement of a crank structure or an eccentric driving structure, and further avoid the problem of friction work of deflection force caused by the deflection angle. The reciprocating power assembly 300 is used for converting the rotary motion of the reciprocating shaft 310 into the linear motion of the reciprocating piston 200, so that the deflection intersection is avoided, and the work stability is better. Therefore, the electric power tool 10 can improve the impact performance while ensuring a compact design.

Referring to fig. 3 to 5, in an embodiment, the reciprocating piston 200 includes a piston body 210 and a reciprocating portion 220, the piston body 210 is disposed in the first cavity 110 in a penetrating manner, the piston body 210 is connected to the reciprocating portion 220, a receiving cavity 221 is disposed on a side of the reciprocating portion 220 opposite to the piston body 210, a limiting groove 222 is disposed on an inner wall of the receiving cavity 221, and a reciprocating shaft 310 is disposed in the receiving cavity 221 in a penetrating manner, so that the moving body 320 is limited in the limiting groove 222. The piston body 210 is arranged to facilitate the compression of the gas in the first cavity 110, and the reciprocating part 220 is arranged to facilitate the connection between the moving body 320 and the reciprocating shaft 310, so as to facilitate the reciprocating movement of the piston body 210 in the first cavity 110.

In one embodiment, the reciprocating guide rail is a reciprocating groove 311, the reciprocating groove 311 is a closed curve-shaped groove surrounding the axis of the reciprocating shaft 310, the moving body 320 is a sphere, the moving body 320 is limited between the inner wall of the reciprocating groove 311 and the inner wall of the limiting groove 222, and the moving body 320 can roll in the reciprocating groove 311. The moving body 320 rolls in the reciprocating groove 311, so that the smoothness of the movement of the reciprocating piston 200 driven by the moving body 320 is further improved, and the movement stability of the reciprocating piston 200 is improved.

In another embodiment, the reciprocating guide rail may also be a guide protrusion, the guide protrusion is a closed strip-shaped curved protrusion surrounding the axis of the reciprocating shaft 310, and the wave crests and the wave troughs of the curved protrusion are arranged at intervals along the axis of the reciprocating shaft 310; the moving body 320 is provided on the guide protrusion and can move on the guide protrusion in a length direction.

In one embodiment, there may be two moving bodies 320 provided on each reciprocating rail, the two moving bodies 320 are uniformly spaced around the axis of the reciprocating shaft 310, and the two moving bodies 320 can move synchronously during the reciprocating movement. The two moving bodies 320 move synchronously to drive the reciprocating piston 200 to move, so that the moving stability of the reciprocating piston 200 can be further improved, and the stress stability of the reciprocating piston 200 is ensured. In other embodiments, there may be one moving body 320. Alternatively, the number of the moving bodies 320 may be other, and the moving bodies 320 may move in synchronization with each other in the same direction.

In one embodiment, the reciprocating power assembly 300 further includes a rolling position-limiting member 340, the rolling position-limiting member 340 is disposed in the position-limiting groove 222, the moving member 320 is a sphere, and the sphere is rollably disposed between the rolling position-limiting member 340 and the inner wall of the reciprocating groove 311. The rolling stopper 340 prevents the moving body 320 from directly rolling and rubbing against the inner wall of the stopper groove 222. Specifically, a hemispherical recess is formed in the rolling stopper 340, and the moving body 320 is disposed in the hemispherical recess and can roll.

Referring to fig. 3 to 5, in one embodiment, the piston body 210 is integrally formed on the reciprocating portion 220. By integrally forming the piston body 210 on the reciprocating portion 220, the reliability of the connection between the piston body 210 and the reciprocating portion 220 can be further improved, and the reliability of the reciprocating portion 220 driving the piston body 210 to reciprocate can be further improved. In the present embodiment, the reciprocating stroke of the piston body 210 in the first cavity 110 is short, and further, the reciprocating part 220 reciprocates on the reciprocating shaft 310 with a short stroke. The piston body 210 is integrally formed on the reciprocating part 220, which is beneficial to realizing the compact arrangement of the piston body 210 and the reciprocating part 220.

In other embodiments, the side of the piston body 210 facing away from the second cavity 120 may be mounted on the reciprocating portion 220 by a screw, a snap, or the like. Or the piston body 210 may be detachably mounted to the reciprocating part 220 by other means.

In one embodiment, the power tool 10 further includes a mounting case 500, a mounting space 510 is formed in the mounting case 500, the cylinder 100 is mounted on the mounting case 500 such that the mounting space 510 communicates with a side of the first cavity 110 facing away from the second cavity 120, and the reciprocating part 220 and the reciprocating shaft 310 are located in the mounting space 510. The installation of the cylinder 100 is facilitated by the installation of the installation case 500, and the protection of the transmission fit of the reciprocating part 220 and the reciprocating shaft 310 is facilitated.

Specifically, the power source 330 is mounted on a side of the mounting case 500 opposite to the cylinder 100, and the reciprocating shaft 310 can be inserted into the mounting space 510 from the side of the mounting case 500 opposite to the first cavity 110.

In one embodiment, a guiding structure 520 is disposed in the installation space 510, a mating structure 230 is formed on the reciprocating portion 220, and the mating structure 230 is in guiding fit with the guiding structure 520, so that the mating structure 230 can be guided and moved on the guiding structure 520 in a reciprocating manner along the axial direction of the reciprocating shaft 310.

Specifically, the guiding structure 520 is a guide rod, the length direction of the guide rod is the axial direction of the reciprocating shaft 310, and the matching structure 230 is a matching sleeve, and the matching sleeve is sleeved on the guide rod, so that the matching sleeve can move along the length direction of the guide rod.

Referring to fig. 2, 3, 6 and 7, in an embodiment, the cylinder 100 includes a first cylinder portion 130 and a second cylinder portion 140, the second cylinder portion 140 is connected to the first cylinder portion 130, the first cavity 110 is formed in the first cylinder portion 130, the second cavity 120 is formed in the second cylinder portion 140, and an outer diameter of the first cylinder portion 130 is greater than an outer diameter of the second cylinder portion 140. The second cylinder portion 140 has a small outer diameter, which further contributes to downsizing of the electric power tool 10. Since the second cylinder 140 is used to connect with the striking assembly 400, and is located at the front end of the power tool 10, the second cylinder 140 with a small outer diameter is used to facilitate handling and improve stability during use.

In one embodiment, the first cavity 110 penetrates through a side of the first cylinder portion 130 opposite to the second cylinder portion 140, so that the piston body 210 can be inserted into the first cavity 110. The second cavity 120 extends through a side of the second cylinder portion 140 facing away from the first cylinder portion 130, facilitating placement of a portion of the impact assembly 400 within the second cavity 120.

In one embodiment, the second cylinder portion 140 is integrally formed with the first cylinder portion 130. By integrally forming the second cylinder portion 140 on the first cylinder portion 130, the reliability of the connection between the first cylinder portion 130 and the second cylinder portion 140 can be ensured, and the stability of the communication between the first cavity 110 and the second cavity 120 can be ensured.

In other embodiments, the first cylinder portion 130 and the second cylinder portion 140 may be spliced on one side to ensure that the first cavity 110 and the second cavity 120 communicating with each other can be formed in the cylinder 100.

In one embodiment, the axial dimension of the first cavity 110 is smaller than the axial dimension of the second cavity 120. Due to the larger radial dimension of the first cavity 110, a larger impact capacity of the impact assembly 400 in the second cavity 120 can be achieved with a shorter stroke of the reciprocating piston 200 in the first cavity 110. By making the axial dimension of the first cavity 110 smaller than the axial dimension of the second cavity 120, the compact design of the power tool 10 can be further facilitated.

Referring to fig. 2, 3, 6 and 7, in an embodiment, the impact assembly 400 includes an impact hammer 410 and a working head 420, the impact hammer 410 is disposed in the second cavity 120, the working head 420 is mounted on an end of the cylinder 100 opposite to the first cavity 110, and the impact hammer 410 can reciprocate in the second cavity 120 to impact the working head 420. Since the impact hammer 410 is disposed in the second cavity 120, when the reciprocating piston 200 compresses the gas medium in the first cavity 110 into the second cavity 120, the impact hammer 410 can be pressed toward the working head 420, so as to impact the working head 420.

In one embodiment, the cylinder 100 is provided with an air replenishing hole 150 and an air outlet hole 160, the air outlet hole 160 is communicated with the second cavity 120 at a position far away from the first cavity 110, the air replenishing hole 150 is communicated with the first cavity 110 or communicated with the second cavity 120 at a position close to the first cavity 110, and the impact hammer 410 can be located between the air replenishing hole 150 and the air outlet hole 160. The impact hammer 410 is located between the air outlet 160 and the air supply hole 150 in the initial state, and the gas medium in the first cavity 110 can be supplied with air through the air supply hole 150. When compression is performed, air on the side of the impact hammer 410 facing away from the first cavity 110 can be discharged through the air outlet 160, so that impact of the impact hammer 410 on the working head 420 is achieved. After the impact of the impact hammer 410 is completed, the impact hammer rebounds to the position between the air outlet 160 and the air supply hole 150 by using the reaction force, and simultaneously, the reciprocating piston 200 resets and circulates in sequence, so that the reciprocating impact of the impact hammer 410 on the working head 420 is realized.

In one embodiment, the cylinder 100 further has a suction hole 170, and the suction hole 170 is communicated with the second cavity 120 and is located between the air outlet 160 and the air supply hole 150. The hammer 410 is located in front of the air outlet hole 160 and the air supplement hole 150 in the initial state and can block the air inlet hole 170. When the impact hammer 410 impacts the working head 420, the covering of the air suction hole 170 can be released, at the moment, the reciprocating piston 200 starts to reset, and the space of the impact hammer 410 facing to the first cavity 110 can be simultaneously supplied with air through the air suction hole 170 and the air supply hole 150, so that the air supply efficiency is improved. The hammer 410 is rebounded between the air outlet hole 160 and the air supply hole 150 by a reaction force and covers the air inlet hole 170 again. By providing the air suction holes 170, the air supplement efficiency of the first cavity 110 can be improved.

In the present embodiment, the electric power tool 10 in any one of the above embodiments is an electric pick. In other embodiments, the power tool 10 of any of the above embodiments may also be an electric hammer.

The power tool 10 in the above-described embodiment can ensure the sliding distance and the sliding speed of the impact hammer 410 in the second cavity 120 by the first cavity 110 having a larger radial dimension, and generate a sufficiently large impact force with a smaller stroke of the reciprocating piston 200. By using the reciprocating shaft 310 of the reciprocating power assembly 300, the reciprocating piston 200 can be more uniformly and stably stressed during the reciprocating movement, and the stability of the gas compression in the first cavity 110 can be further ensured. The electric tool 10 has a compact structure, and the whole machine has a small volume and a light weight under the same impact capability level.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

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

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" 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 as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. A power tool, characterized in that the power tool comprises:

the cylinder is internally provided with a first cavity and a second cavity which are communicated along the axial direction, and the radial size of the first cavity is larger than that of the second cavity;

a reciprocating piston disposed within the first cavity;

the reciprocating power assembly comprises a reciprocating shaft, a moving body and a power source, wherein a reciprocating guide rail is arranged on the reciprocating shaft, the reciprocating guide rail is a closed curve-shaped guide rail surrounding the axis of the reciprocating shaft, and the wave crests and the wave troughs of the curve-shaped guide rail are arranged at intervals along the axis of the reciprocating shaft; the moving body is limited on the reciprocating piston and can move on the reciprocating guide rail; the power source is used for driving the reciprocating shaft to rotate so that the moving body drives the reciprocating piston to reciprocate along the axial direction of the reciprocating shaft, the reciprocating piston is used for compressing a medium in the first cavity to the second cavity, and the axial direction of the reciprocating shaft is the direction from the first cavity to the second cavity; and

and part of the impact assembly is arranged in the second cavity, and the impact assembly can perform impact motion along the axial direction of the reciprocating shaft.

2. The electric power tool according to claim 1, wherein the air cylinder includes a first cylinder portion and a second cylinder portion, the second cylinder portion is connected to the first cylinder portion, the first cavity is formed in the first cylinder portion, the second cavity is formed in the second cylinder portion, and an outer diameter dimension of the first cylinder portion is larger than an outer diameter dimension of the second cylinder portion.

3. The power tool of claim 2, wherein the second cylinder portion is integrally formed on the first cylinder portion.

4. The power tool of claim 2, wherein the axial dimension of the first cavity is smaller than the axial dimension of the second cavity.

5. The electric tool according to any one of claims 1 to 4, wherein the reciprocating piston comprises a piston body and a reciprocating portion, the piston body is inserted into the first cavity, the piston body is connected with the reciprocating portion, an accommodating cavity is formed in one side of the reciprocating portion, which faces away from the piston body, a limiting groove is formed in an inner wall of the accommodating cavity, and the reciprocating shaft is inserted into the accommodating cavity so that the moving body is limited in the limiting groove.

6. The power tool of claim 5, wherein the piston body is integrally formed on the reciprocative portion.

7. The power tool according to claim 5, further comprising a mounting case in which a mounting space is formed, wherein the cylinder is mounted to the mounting case such that the mounting space communicates with a side of the first cavity facing away from the second cavity, and wherein the reciprocating portion and the reciprocating shaft are located in the mounting space.

8. The electric power tool according to claim 5, wherein the reciprocating guide rail is a reciprocating groove which is a closed curved groove that surrounds the axis of the reciprocating shaft, the moving body is a ball, the moving body is held between an inner wall of the reciprocating groove and an inner wall of the holding groove, and the moving body can roll in the reciprocating groove.

9. The power tool of any one of claims 1-4, wherein the impact assembly comprises an impact hammer disposed in the second cavity and a working head mounted on an end of the cylinder opposite the first cavity, the impact hammer being capable of reciprocating in the second cavity to impact the working head.

10. The power tool of claim 9, wherein the cylinder defines an air supply hole and an air outlet hole, the air outlet hole is in communication with the second cavity at a position away from the first cavity, the air supply hole is in communication with the first cavity or in communication with the second cavity at a position close to the first cavity, and the impact hammer is capable of being positioned between the air supply hole and the air outlet hole.