CN111791194A

CN111791194A - Electric tool shell and electric tool

Info

Publication number: CN111791194A
Application number: CN202010624069.7A
Authority: CN
Inventors: 杨远作; 余仁田; 柯亨钊; 戴建红
Original assignee: Zhejiang Lera New Energy Power Technology Co Ltd
Current assignee: Zhejiang Lera New Energy Power Technology Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2020-10-20
Also published as: WO2022001199A1

Abstract

The invention relates to an electric tool shell and an electric tool, comprising: at least one first housing element arranged at the upper end of the drive train unit and on a part of the handle, and at least one second housing element arranged at the lower end of the drive train unit and on a part of the handle, the first housing element and the second housing element being connected along a contact line; the first shell element and/or the second shell element are/is provided with a first through hole, and the first through hole is used for arranging an adjusting element; the contact line is remote from the first via. The technical scheme of the invention is that the contact line between the electric tool shells is arranged to be far away from the adjusting element, so that the problem that the gap at the junction between the shells is enlarged due to frequent use of the adjusting element, the adjusting element is not smooth enough when the gears are switched can be avoided, and the smoothness of the adjusting element in use is ensured.

Description

Electric tool shell and electric tool

Technical Field

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

Background

The electric tool is a hand-held or movable mechanical tool which takes a motor or an electromagnet as power and drives a working head to work through a transmission mechanism. The electric tool has the characteristics of convenience in carrying, simplicity in operation, various functions and the like, can greatly reduce the labor intensity, improve the working efficiency and realize manual operation mechanization, so that the electric tool is widely applied to the fields of buildings, house decoration, automobiles, machinery, electric power, bridges, gardening and the like and can enter families in a large quantity.

Electric tool is in the use, need switch the gear and realize different rotational speeds or functions, and the button that switches the gear usually leads to the juncture gap grow between the casing near the juncture between electric tool's casing, often uses easily for the inside components and parts of casing takes place the dislocation, thereby causes the gear button smooth and easy inadequately when switching, influences electric tool's use.

Disclosure of Invention

The invention aims to provide a novel electric tool shell, wherein a contact line between the electric tool shells is far away from an adjusting element, so that the smoothness of the adjusting element in use can be improved.

In order to achieve the purpose, the invention adopts the following technical scheme: a power tool housing comprising: at least one first housing element arranged at the upper end of the drive train unit and on a part of the handle, and at least one second housing element arranged at the lower end of the drive train unit and on a part of the handle, the first housing element and the second housing element being connected along a contact line; the first shell element and/or the second shell element are/is provided with a first through hole, and the first through hole is used for arranging an adjusting element; the contact lines comprise a first contact line parallel to the drive train unit and a second contact line parallel to the handle, the first and/or second contact lines being remote from the first through hole.

Preferably, the first housing element and/or the second housing element have at least substantially no separate edges at the first through hole.

Preferably, the first contact line is arranged on two sides of the electric tool shell, one end of the first contact line extends to the end surface close to the chuck, and the other end of the first contact line extends to the handle.

Preferably, one end of the second housing element close to the chuck is provided with a receiving portion extending towards the first housing element, and the first housing element is sleeved outside the receiving portion along an axial direction of the receiving portion and is spliced and fixed with the second housing element.

Preferably, the receiving portion is provided with a guide member, and the first housing element is provided with a dovetail groove engaged with the guide member.

Preferably, a vent is provided on the first housing element and/or the second housing element.

Preferably, one end of the second housing element close to the chuck is provided with a first ventilation opening, and the rear end of the first housing element is provided with a second ventilation opening.

Preferably, the electric tool housing further comprises an end cover, the end cover is mounted at the rear end of the first housing element, and the end cover is provided with an air inlet communicated with the second ventilation opening.

The invention also provides an electric tool, which comprises the electric tool shell and at least one transmission system unit arranged in the electric tool shell; the transmission system unit comprises a motor, a connecting piece sleeved outside the motor and a speed changer; the motor is fixed in the connecting piece, one end of the connecting piece is fixedly connected with the rear end part of the first shell element, and the other end of the connecting piece is fixedly connected with the shell of the transmission.

Preferably, the connecting piece is provided with a threaded hole, and the connecting piece and the first shell element are fixedly connected through a screw.

Preferably, a hook is arranged on the connecting piece, a clamping groove matched with the hook is arranged on the first shell element, and the connecting piece is fixedly connected with the first shell element through a buckle.

Preferably, the power tool further comprises an end cap disposed at an end remote from the chuck, the end cap being removably connected to the first housing element.

Preferably, the second housing element is fixedly connected to the housing of the transmission.

Preferably, the connecting member is fixedly connected to the housing of the transmission by a pin.

Preferably, the electric tool further comprises a speed changing element, the speed changing element comprises an adjusting element and a rotating ring matched with the adjusting element, the rotating ring is sleeved on the transmission, and the adjusting element drives the rotating ring to rotate so as to provide switching of speed modes.

Preferably, the lower end surface of the adjusting element is provided with at least one first protruding portion, the matching position of the rotating ring and the adjusting element is provided with at least one second protruding portion, and the first protruding portion is abutted to the second protruding portion and used for driving the rotating ring to rotate when the adjusting element is stirred.

Preferably, the inner wall of the first housing element is provided with a fixing portion for mounting the adjustment element.

Preferably, the adjusting element comprises a protrusion and a sliding piece, and the protrusion and the sliding piece are of detachable structures or integrally formed structures.

The invention also provides an assembling method of the electric tool, which comprises the following steps: fixedly connecting the front end of the drive train unit with the second housing element; mounting an adjustment element to the first through hole location; and sliding the first shell element along the axial direction of the power train unit and fixedly connecting the first shell element with the power train unit.

The invention also provides an assembling method of the electric tool, which comprises the following steps: mounting an adjustment element to the first through hole location; fixedly connecting the rear end of the drive train unit with the first housing element; and sliding the second shell element along the axial direction of the power train unit and fixedly connecting the second shell element with the power train unit.

Compared with the prior art, the invention has the beneficial effects that:

according to the electric tool shell provided by the technical scheme, the contact line between the electric tool shells is set to be away from the adjusting element, the gap of the junction between the shells, caused by frequent use of the adjusting element, can be prevented from being enlarged, the internal element of the electric tool is caused to be staggered, so that the adjusting element is not smooth enough when the gears are switched, the connection stability between the electric tool shells is improved, and the smoothness of the adjusting element during use is guaranteed.

Furthermore, the two ends of the transmission system are respectively connected to the shell by using connection forms such as screws or buckles, and the fixed connection of the transmission system unit and the shell is realized.

Furthermore, the fastening element is hidden through the end cover, and the fastening element is hidden through the chuck, so that the whole electric tool is not provided with the exposed fastening element in appearance, and the attractiveness of the electric tool is improved.

Furthermore, the transmission system units are connected into a whole by arranging the connecting piece, and a plurality of installation modes exist, so that the convenience of connection and installation between the transmission system units and the component elements of the transmission system units is improved.

Furthermore, through the arrangement of the guide piece and the dovetail groove, the tilting of parts of the shells is prevented, and the firmness of connection between the shells is enhanced.

Furthermore, the ventilation opening is formed in the position, close to the motor, of the rear end of the electric tool shell, and the ventilation opening is formed in the position, close to the transmission, of the front end of the electric tool shell, so that heat dissipation of internal elements of the electric tool is facilitated, and the heat dissipation effect is good.

Further, the end cap may serve as a marking element, with a decorative effect.

Drawings

Fig. 1 is a first schematic diagram of an electric tool according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of the position of a contact line in an embodiment of the invention.

Fig. 3 is an exploded view of a power tool according to an embodiment of the present invention.

Fig. 4 is an exploded view of a power tool according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a power train unit in an embodiment of the present invention.

Fig. 6 is a schematic view of the connection of the drive train unit and the first housing element in an embodiment of the invention.

Fig. 7 is a schematic view of the connection of the drive train unit and the second housing element in an embodiment of the invention.

Fig. 8 is a schematic structural view of a transmission member in an embodiment of the present invention.

Fig. 9 is a first schematic structural diagram of a fixing portion in an embodiment of the present invention.

Fig. 10 is a second schematic structural diagram of the fixing portion in the embodiment of the present invention.

Fig. 11 is a schematic structural diagram of an adjusting element in an embodiment of the present invention.

Fig. 12 is a second schematic diagram of an electric tool according to an embodiment of the invention.

Fig. 13 is a third schematic view of an electric tool according to an embodiment of the present invention.

Fig. 14 is a schematic structural view of a connector in an embodiment of the present invention.

Fig. 15 is a schematic view of a connection relationship between a connection member and a motor according to an embodiment of the present invention.

Fig. 16 is a schematic view of a connection member, an electric motor and a transmission according to an embodiment of the present invention.

11. A first housing element; 111. a dovetail groove; 112. a second vent; 113. a fixed part; 114. a third vent; 12. a second housing element; 121. a receiving part; 122. mounting grooves; 123. a guide member; 124, a first vent; 13. a contact line; 131. a first contact wire; 132. a second contact wire; 14. a first through hole; 15. an end cap; 151. an air inlet; 20. a drive train unit; 21. a motor; 22. a connecting member; 23. a transmission; 30. a handle; 40. a chuck; 50. a speed change member; 51. an adjustment element; 511. a first boss portion; 512. a protrusion; 513. sliding blades; 52. a rotating ring; 521. a second boss.

Detailed Description

The present invention will now be described in more detail with reference to the accompanying drawings, in which the description of the invention is given by way of illustration and not of limitation. The various embodiments may be combined with each other to form other embodiments not shown in the following description.

The embodiment of the invention provides a shell of an electric tool, belonging to the components of the electric tool shown in figure 1. Referring to fig. 1-4, the housing of the power tool includes: a first housing element 11, a second housing element 12 and an end cover 15, wherein the first housing element 11 is provided with at least one and is arranged on the upper end of the transmission system unit 20 and a part of the handle 30, the second housing element 12 is provided with at least one and is arranged on the lower end of the transmission system unit 20 and a part of the handle 30, and the upper end and the lower end are not two ends in a physical sense, but refer to an upper half part and a lower half part, and also include two sides of the transmission system unit 20; the end cap 15 is mounted at the rear end of the first housing element 11 and detachably connected to the first housing element 11, and optionally, the connection mode of the end cap 15 and the first housing element 11 includes a fixed connection mode such as a threaded connection, a snap connection, and the like. The end cap 15 has a decorative effect, and a marking feature can be formed on the end cap 15, wherein the marking feature can be a prompt for a mark of the electric tool, a name of a brand manufacturer and information. Alternatively, the marking features may be identified by printing, engraving, gluing, LED, OLED, display, etc.

The first housing element 11 is connected to the second housing element 12 along a contact line 13, the first housing element 11 and the second housing element 12 are provided with a latch structure along the contact line 13 for securing the first housing element 11 and the second housing element 12 together, and a slide groove is provided along the contact line 13 for facilitating the mounting between the first housing element 11 and the second housing element 12. The contact wire 13 includes a first contact wire 131 and a second contact wire 132, the first contact wire 131 is disposed on both sides of the housing of the power tool, is parallel to the axis of the drive train unit 20 and is substantially in the same horizontal plane, and the second contact wire 132 is substantially parallel to the axial direction of the handle 30. The handle has a separating edge on the side facing the chuck and/or on the side facing away from the chuck.

The first housing element 11 and/or the second housing element 12 is provided with a first through hole 14, the first through hole 14 is far away from the first contact wire 131 and/or the second contact wire 132, that is, the edge of the first through hole 14 is not in contact with the contact wire 13, and in addition, the first through hole 14 is completely provided on the first housing element 11 or the second housing element 12, and is formed in a non-splicing manner. The first through hole 14 is used for arranging an adjusting element 51, and the adjusting element 51 is used for adjusting the rotating speed and/or the forward and reverse rotation of the electric tool. By disposing the contact line 13 away from the adjusting element 51, it is avoided that the gap between the first housing element 11 and the second housing element 12 becomes larger due to frequent use of the adjusting element 51, which leads to misalignment of internal components of the electric power tool, and thus the adjusting element 51 is not smooth enough when shifting gears, the stability of connection between the first housing element 11 and the second housing element 12 is improved, and the smoothness of use of the adjusting element 51 is ensured.

The first housing member and the second housing member are joined to form a power tool housing that includes a main housing that houses a drive train unit and a handle, the handle having an interior region that houses a battery.

In one embodiment, the first contact wires 131 are disposed on two sides of the housing of the electric power tool, and one end of the first contact wires extends to the end surface near the chuck 40, the other end of the first contact wires extends to the handle 30, the first housing element 11 and/or the second housing element 12 has no separated edge at the first through hole 14, and the separated edge of the first housing element 11 and/or the second housing element 12 is partially located on the end surface facing the chuck 40. The first housing element 11 and/or the second housing element 12 have at least substantially no separating edges on the side facing away from the handle 30, for example the first housing element 11 and/or the second housing element 12 have substantially no separating edges in a plane perpendicular to the drive train unit 20, see fig. 12, the side of the first housing element 11 and/or the second housing element 12 which is viewed in the direction of the Z axis of the coordinate axis in the direction of the power tool. Referring to fig. 13, in other embodiments, the edge of the first housing element 11 and/or the second housing element 12 that is separated may also be partially located between the first through hole 14 and the end surface facing the chuck 40. The first housing element 11 and/or the second housing element 12 present a separate edge at the surface remote from the handle 30.

In a preferred embodiment, a receiving portion 121 extending toward the first housing element 11 is disposed at one end of the second housing element 12 close to the chuck 40, the receiving portion 121 is in a hollow semi-cylindrical shape, and mounting grooves 122 are disposed at two ends of the receiving portion 121, and the first housing element 11 is sleeved outside the receiving portion 121 along an axial direction of the receiving portion 121 and is fixedly connected to the second housing element 12. In another embodiment, the first housing element 11 may be disposed on the side of the receiving portion 121 along the axial direction of the receiving portion 121 without being sleeved outside the receiving portion 121, and may contact with one end surface of the receiving portion 121.

Further, a guide member 123 is disposed on the receiving portion 121, a dovetail groove 111 is disposed on the first housing element 11, a cross section of the guide member 123 is in an inverted trapezoid shape, and a shape of the dovetail groove 111 is matched with that of the guide member 123. When the first housing element 11 is sleeved outside the receiving portion 121 along the axial direction of the receiving portion 121, the dovetail groove 111 is clamped outside the guiding member 123, so that the first housing element 11 is effectively prevented from tilting, and the stability of the housing installation of the electric tool is improved.

Further, the guide 123 and one end of the dovetail groove 111 facing the end cover 15 are provided with chamfers, so that the installation is convenient.

The first housing element 11 and/or the second housing element 12 are provided with ventilation openings.

In one embodiment, the second housing member 12 is provided with the first ventilation opening 124, specifically, the first ventilation opening 124 is provided on an inclined surface of the second housing member 12 below the chuck 40, so that the inclined surface is exposed outside the chuck 40, which is more effective in ventilation, in other embodiments, the first ventilation opening 124 may also be provided at a position where the second housing member 12 faces the chuck 40, so that the second housing member is hidden by the chuck 40, which makes the surface of the housing of the power tool have fewer openings, which is more attractive;

referring to fig. 6, optionally, a third ventilation opening 114 is disposed at a rear end portion of the first casing element 11, and referring to fig. 3, a second ventilation opening 112 is disposed near the first ventilation opening 14 of the first casing element 11 or the second casing element 12. Referring to fig. 1, the end cap 15 is provided with an air inlet 151. The air inlet 151 is communicated with the third air outlet 114. The line connecting the first vent 124 and the third vent 114 is substantially along the axial direction of the drive train unit 20.

In one embodiment, a ventilation opening can be arranged at the position of the starting switch of the electric tool, when the starting switch is not started, the ventilation opening is hidden by the starting switch, and when the starting switch is started, the ventilation opening is exposed.

With reference to fig. 1 to 5, an embodiment of the present invention further provides an electric tool, which includes the electric tool housing, a power train unit 20 and a speed changing element 50, wherein the power train unit 20 is disposed inside the electric tool housing and at least one of the power train unit and the speed changing element is disposed inside the electric tool housing. The power train unit 20 includes a motor 21, a connecting member 22 and a transmission 23, wherein the connecting member 22 is sleeved outside the motor 21.

In one embodiment, referring to fig. 1-5 and 14-15, the motor 21 is fixed in the connecting member 22, one end of the connecting member 22 is fixedly connected to the rear end of the first housing element 11, and the other end of the connecting member 22 is fixedly connected to the housing of the transmission 23. Referring to fig. 6, in one connection manner between the connecting piece 22 and the first housing element 11, a threaded hole is formed on the connecting piece 22, and the connecting piece 22 and the first housing element 11 are fixedly connected by a screw; referring to fig. 4, in another connection manner of the connecting piece 22 and the first housing element 11, a hook is disposed on the connecting piece 22, a slot matched with the hook is disposed on the first housing element 11, and the connecting piece 22 and the first housing element 11 are fixedly connected by a buckle; the end cap 15 is used to hide the connection part of the connector 22 and the first housing element 11, such as the screw or the snap, from the surface of the power tool, so as to avoid visible fastening elements, thereby ensuring the aesthetic appearance of the power tool. Referring to fig. 5, in one connection mode of the connection element 22 and the transmission 23, the connection element 22 and the housing of the transmission 23 are fixedly connected by a pin, and a limit structure is disposed at a connection position, specifically, the limit structure may be configured such that a convex portion is disposed on the connection element 22, and a concave portion having a shape matched with the convex portion is disposed on the housing of the transmission 23, and the convex portion and the concave portion are in insertion fit, so as to ensure that the connection element 22 and the transmission 23 rotate synchronously, and in other connection modes, the connection element 22 and the housing of the transmission 23 may be connected and limited by a self-locking structure thereof.

In other embodiments, as shown in fig. 16 below, the connecting member 22 may also fix both the motor 21 and the transmission 23 inside, and both ends of the connecting member 22 are fixedly connected to the first housing member 11 and the second housing member 12, respectively, and the specific connection manner includes a screw connection, a snap connection, and the like.

Referring to fig. 3 and 7, in one embodiment, the second housing member 12 is fixedly connected to the housing of the transmission 23 by screws, and the chuck 40 can hide the positions of the screws, so as to prevent the screws from being visible on the surface of the power tool, thereby improving the aesthetic appearance of the power tool.

Referring to fig. 5 and 8, the speed changing element 50 includes an adjusting element 51 and a rotating ring 52, the rotating ring 52 is sleeved outside the transmission 23, and the adjusting element 51 drives the rotating ring 52 to rotate, so as to provide speed mode switching. The lower end face of the adjusting element 51 is provided with at least one first protruding portion 511, the matching position of the rotating ring 52 and the adjusting element 51 is provided with at least one second protruding portion 521, and the first protruding portion 511 is abutted to the second protruding portion 521, so that when the adjusting element 51 is pulled, the adjusting element 51 can drive the rotating ring 52 to rotate. Specifically, referring to fig. 8, the number of the first protruding portions 511 and the number of the second protruding portions 521 are four, each two of the first protruding portions 511 and the second protruding portions 521 form a group, and the two second protruding portions 521 respectively abut against the outer sides of the two first protruding portions 511, so that the adjusting element 51 and the rotating ring 52 can rotate synchronously. Preferably, the ends of the first protruding portion 511 opposite to the second protruding portion 521 are provided with chamfers, so as to facilitate installation.

Referring to fig. 9-11, the adjusting element 51 includes a protrusion 512 and a sliding piece 513, and the protrusion 512 and the sliding piece 513 are detachable structures or integrally formed structures. The inner wall of the first housing element 11 is provided with a fixing portion 113 for mounting the adjusting element 51.

In one embodiment, the protrusion 512 and the sliding piece 513 are detachable structures, so as to facilitate installation, and the assembly method is to insert the sliding piece 513 into the fixing portion 113 for fastening, then place the protrusion 512 into the first through hole 14, and fixedly connect the protrusion with the sliding piece 513, for example, by a snap-fit connection. Referring to fig. 10, the fixing portion 113 is shaped like an L-shaped sheet, and an accommodating area is formed between the fixing portion 113 and the inner wall of the first housing element or the inner wall of the second housing element, and the accommodating area is used for accommodating the sliding piece 513, so that the fixing effect is good.

In one embodiment, the protrusion 512 and the sliding piece 513 are integrally formed, and have a simple structure and are convenient to process, the adjusting element 51 is directly inserted into the fixing portion 113 and fastened, the sliding piece 513 is embedded between the fixing portion 113 and the inner wall of the housing element, and the protrusion 512 is inserted into the first through hole 14. Referring to fig. 9, the fixing portion 113 is shaped as a strip with two steps, and is configured into 2, and the 2 fixing portions 113 are disposed at equal intervals on two axial sides of the first through hole 14, so that the fixing portion 113 can deform properly during installation, and the smooth installation of the adjusting element 51 is ensured.

Referring to fig. 1-4, 8 and 11, an embodiment of the present invention further provides an assembling method of an electric tool, including: fixedly connecting the front end of the drive train unit 20 to the second housing element 12; mounting the adjusting element 51 at the position of the first through hole 14; the first housing member 11 is slid in the axial direction of the power train unit 20 and fixedly connected to the power train unit 20.

Referring to fig. 1-4, 8 and 11, an embodiment of the present invention further provides an assembling method of an electric tool, including: mounting the adjusting element 51 at the position of the first through hole 14; fixedly connecting the rear end of the drive train unit 20 to the first housing element 11; the second housing member 12 is slid in the axial direction of the power train unit 20 and fixed to the power train unit 20.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. A power tool housing, comprising:

at least one first shell element arranged at the upper end of the transmission system unit and on part of the handle;

at least one second housing element disposed at a lower end of the drive train unit and on a portion of the handle, the first housing element being connected to the second housing element along a contact line; wherein the content of the first and second substances,

a first through hole is formed in the first shell element and/or the second shell element and used for arranging an adjusting element;

the contact lines comprise a first contact line parallel to the drive train unit and a second contact line parallel to the handle, the first and/or second contact lines being remote from the first through hole.

2. The power tool housing according to claim 1, characterized in that the first housing element and/or the second housing element at the first through hole are at least substantially free of a separating edge.

3. The power tool housing of claim 1, wherein the first contact wire is disposed on both sides of the power tool housing, and has one end extending to an end surface adjacent the chuck and the other end extending to the handle.

4. The power tool housing as claimed in claim 3, wherein the second housing member has a receiving portion at an end thereof adjacent to the chuck, the receiving portion extending toward the first housing member, and the first housing member is sleeved outside the receiving portion along an axial direction of the receiving portion and is assembled and fixed with the second housing member.

5. A power tool housing according to claim 4 wherein the socket is provided with a guide and the first housing member is provided with a dovetail slot for cooperation with the guide.

6. The power tool housing according to claim 1, wherein a vent is provided on the first housing element and/or the second housing element.

7. The power tool housing of claim 6, wherein the second housing member has a first vent opening at an end thereof adjacent the collet and a second vent opening at a rear end thereof.

8. The power tool housing of claim 7, further comprising an end cap mounted to a rear end of the first housing member, the end cap having an air inlet in communication with the second air vent.

9. A power tool comprising a power tool housing according to any one of claims 1 to 8, further comprising at least one drive train unit disposed inside the power tool housing; wherein the content of the first and second substances,

the transmission system unit comprises a motor, a connecting piece sleeved outside the motor and a speed changer;

the motor is fixed in the connecting piece, one end of the connecting piece is fixedly connected with the rear end part of the first shell element, and the other end of the connecting piece is fixedly connected with the shell of the transmission.

10. The power tool of claim 9, wherein the connector has a threaded bore, and the connector and the first housing member are fixedly coupled by a screw.

11. The power tool of claim 9, wherein the connector has a hook, the first housing element has a slot, and the connector is fixedly connected to the first housing element by a snap.

12. The power tool of claim 10 or 11, further comprising an end cap disposed at an end remote from the chuck, the end cap being removably connected to the first housing member.

13. The power tool of claim 9, wherein the second housing member is fixedly connected to a housing of the transmission.

14. The power tool of claim 9, wherein the connector is fixedly coupled to the housing of the transmission by a pin.

15. The power tool of claim 9, further comprising a transmission member, wherein the transmission member includes an adjusting member and a rotating ring engaged with the adjusting member, the rotating ring is disposed on the transmission, and the adjusting member drives the rotating ring to rotate for providing speed mode switching.

16. The power tool of claim 15, wherein the lower end surface of the adjusting element is provided with at least one first protrusion, the fitting portion of the rotating ring and the adjusting element is provided with at least one second protrusion, and the first protrusion abuts against the second protrusion for driving the rotating ring to rotate when the adjusting element is turned.

17. The power tool of claim 16, wherein the inner wall of the first housing member is provided with a fixing portion for mounting the adjustment member.

18. The power tool of claim 17, wherein the adjustment element includes a protrusion and a slide, the protrusion and slide being of a detachable or integrally formed construction.

19. A method of assembling a power tool, comprising:

fixedly connecting the front end of the drive train unit with the second housing element;

mounting an adjustment element to the first through hole location;

and sliding the first shell element along the axial direction of the power train unit and fixedly connecting the first shell element with the power train unit.

20. A method of assembling a power tool, comprising:

mounting an adjustment element to the first through hole location;

fixedly connecting the rear end of the drive train unit with the first housing element;

and sliding the second shell element along the axial direction of the power train unit and fixedly connecting the second shell element with the power train unit.