阅读说明：本技术 一种电动工具 (Electric tool ) 是由 李佳玉 赵祥 于 2020-05-21 设计创作，主要内容包括：本发明公开了一种电动工具,其属于工具类领域,包括机身壳体、控制机构、电机、操作部件和信号开关,控制机构设置于所述机身壳体内且与电源电连接,用于控制工作组件运转；电机设置于所述第一壳体部内,所述电机通过电机导线与所述控制机构电连接；操作部件设于所述机身壳体上；信号开关通过控制导线与所述控制机构电连接,所述操作部件被设置为在所述机身壳体上移位来打开或关闭所述信号开关,所述信号开关控制所述电机的启动或中断,所述操作部件与所述电机导线分别位于所述信号开关的两侧。采用体积较小的信号开关,充分利用机身壳体的内部空间,便于其他部件布局；避免了操作部件对电机导线的磨损,降低了故障率。(The invention discloses an electric tool, which belongs to the field of tools and comprises a machine body shell, a control mechanism, a motor, an operating component and a signal switch, wherein the control mechanism is arranged in the machine body shell, is electrically connected with a power supply and is used for controlling a working assembly to operate; the motor is arranged in the first shell part and is electrically connected with the control mechanism through a motor lead; the operating component is arranged on the machine body shell; the signal switch is electrically connected with the control mechanism through a control lead, the operating component is arranged on the machine body shell to shift to open or close the signal switch, the signal switch controls the starting or the interruption of the motor, and the operating component and the motor lead are respectively positioned on two sides of the signal switch. A signal switch with a small volume is adopted, so that the internal space of the machine body shell is fully utilized, and the layout of other components is facilitated; the abrasion of the operating parts to the motor lead is avoided, and the failure rate is reduced.)

1. A power tool, comprising:

the body shell comprises a first shell part, a second shell part and a third shell part which are sequentially arranged from front to back, wherein the first shell part is connected with the working assembly, and the third shell part is connected with the power supply;

the control mechanism is arranged in the machine body shell and used for controlling the working assembly to operate, and the control mechanism is electrically connected with the power supply;

the motor is supported in the first shell part by a bearing and is electrically connected with the control mechanism through a motor lead;

an operating member provided on the body housing;

it is characterized by also comprising:

the signal switch comprises a trigger part, the signal switch is electrically connected with the control mechanism through a control lead, the operating component is arranged on the machine body shell to move so as to open or close the signal switch, the signal switch controls the starting or the interruption of the motor, and the operating component and the motor lead are respectively positioned at two sides of the signal switch;

the moving direction of the trigger part is parallel to the operating direction of the operating component, or the moving direction of the trigger part and the operating direction of the operating component form an angle.

2. The electric power tool according to claim 1, wherein the operating member and the trigger are configured to move along a rotation axis of the motor, and if an axial distance between an operating position of the operating member and a trigger position of the signal switch is h and an axial support distance of the motor is L:

h≤2L；

wherein the operating position refers to an initial position where the operating member is not operated, and the trigger position refers to a position where the signal switch is triggered; the axial support distance of the motor refers to the axial distance from the front end wall of the front bearing chamber of the motor shaft to the rear end wall of the rear bearing chamber of the motor shaft.

3. The electric tool according to claim 1, further comprising a direction changing member provided between the operation member and the signal switch, the direction changing member being an elastic member;

the operating member is configured to move in a first direction to deform the elastic member, and the trigger is configured to be driven by the deformation to move in a second direction perpendicular to the first direction.

4. The power tool according to claim 3, wherein the elastic member is a leaf spring, one end of the leaf spring is fixedly connected to the body housing, the other end of the leaf spring is a free end, and the operating member is in contact with the free end.

5. The power tool according to claim 3, wherein the elastic member is a leaf spring, one end of the leaf spring is fixedly connected to the signal switch, the other end of the leaf spring is a free end, and the operating member is in contact with the free end.

6. The power tool of claim 1, wherein the body housing includes a wiring passage through which the motor lead passes, the wiring passage and the signal switch being located on both radial sides of a motor shaft, respectively.

7. The power tool of claim 1, wherein the motor conductor carries a current that is greater than the control conductor.

8. The power tool of claim 1, wherein the operating member is a trigger assembly pivotally coupled to the body housing.

9. The power tool of any one of claims 1-8, wherein the signal switch is disposed within the first housing portion, or wherein the signal switch is disposed at a transition region between the first housing portion and the second housing portion, the transition region being a region of varying outer diameter connecting the first housing portion and the second housing portion.

10. The power tool of claim 9, wherein the outer diameter of the second housing portion is smaller than the outer diameter of the first housing portion.

Technical Field

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

Background

The electric tool generally includes a housing, a motor disposed in the housing, and a transmission mechanism, wherein the motor drives a spindle to perform an impact or rotation motion through the transmission mechanism. The shell is provided with a holding part, so that the shell can be held by hands conveniently. The switch button of the electric tool is generally arranged at the front end of the holding part, so that the start-stop operation is conveniently carried out during holding.

The existing electric tool supplies current through a loaded power supply to drive a motor to rotate. The power supply is connected with the motor through a motor wire, the switch structure is generally arranged between the motor and the power supply, and the motor wire penetrates through the switch structure. The motor lead and the switch structure occupy larger space, so that other parts in the machine body are locally limited, and the size of the whole machine is not reduced.

In addition, the switch structure is controlled to be opened and closed through the operating component on the machine body, and in the process, the operating component can rub with the motor lead, so that the motor lead is abraded, and even an electric leakage accident occurs.

Disclosure of Invention

The invention aims to provide an electric tool to solve the technical problem that a switch structure in the prior art occupies a large space.

As the conception, the technical scheme adopted by the invention is as follows:

a power tool, comprising:

the body shell comprises a first shell part, a second shell part and a third shell part which are sequentially arranged from front to back, wherein the first shell part is connected with the working assembly, and the third shell part is connected with the power supply;

the control mechanism is arranged in the machine body shell and used for controlling the working assembly to operate, and the control mechanism is electrically connected with the power supply;

the motor is supported in the first shell part by a bearing and is electrically connected with the control mechanism through a motor lead;

an operating member provided on the body housing;

the signal switch comprises a trigger part, the signal switch is electrically connected with the control mechanism through a control lead, the operating component is arranged on the machine body shell to move so as to open or close the signal switch, the signal switch controls the starting or the interruption of the motor, and the operating component and the motor lead are respectively positioned at two sides of the signal switch;

the moving direction of the trigger part is parallel to the operating direction of the operating component, or the moving direction of the trigger part and the operating direction of the operating component form an angle.

Further, the operating member and the trigger part are configured to move along a rotation axis of the motor, and if an axial distance between an operating position of the operating member and a trigger position of the signal switch is h, and an axial support distance of the motor is L, then:

h≤2L；

wherein the operating position refers to an initial position where the operating member is not operated, and the trigger position refers to a position where the signal switch is triggered; the axial support distance of the motor refers to the axial distance from the front end wall of the front bearing chamber of the motor shaft to the rear end wall of the rear bearing chamber of the motor shaft.

Furthermore, the device also comprises a reversing piece arranged between the operating component and the signal switch, wherein the reversing piece is an elastic piece;

the operating member is configured to move in a first direction to deform the elastic member, and the trigger is configured to be driven by the deformation to move in a second direction perpendicular to the first direction.

Further, the elastic element is a leaf spring, one end of the leaf spring is fixedly connected with the machine body shell, the other end of the leaf spring is a free end, and the operating component is in contact with the free end.

Further, the elastic element is a leaf spring, one end of the leaf spring is fixedly connected with the switch structure, the other end of the leaf spring is a free end, and the operating component is in contact with the free end.

Further, the fuselage casing includes the supply the wiring passageway that the motor wire passed through, the wiring passageway with signal switch is located the radial both sides of motor shaft respectively.

Further, the carrying current of the motor wire is larger than that of the control wire.

Further, the operating component is a trigger assembly, and the trigger assembly is pivoted with the machine body shell.

Further, the signal switch is arranged in the first shell part, or the signal switch is arranged in a transition area between the first shell part and the second shell part, and the transition area is an area connecting the outer diameters of the first shell part and the second shell part.

Further, the outer diameter of the second housing portion is smaller than the outer diameter of the first housing portion.

The invention has the beneficial effects that:

according to the electric tool, the motor lead is separated from the signal switch, the signal switch with a small size can be adopted, the occupied space is small, the motor and the signal switch can be respectively and electrically connected with the control mechanism, the internal space of the machine body shell is fully utilized, and the layout of other components is facilitated; the operating part is arranged on the machine body shell to shift to open or close the signal switch, and the operating part and the motor lead are respectively positioned on two sides of the signal switch, so that the abrasion of the operating part on the motor lead is avoided, the service life is prolonged, and the failure rate is reduced.

Drawings

Fig. 1 is a cross-sectional view of a power tool according to an embodiment of the present invention;

FIG. 2 is a schematic view of a portion of the structure of FIG. 1;

fig. 3 is an arrangement of a signal switch according to a second embodiment of the present invention;

fig. 4 is another arrangement of the signal switch according to the second embodiment of the present invention;

fig. 5 is a bottom view of a part of the structure of a power tool according to a third embodiment of the present invention;

FIG. 6 is an enlarged view at A of FIG. 5;

FIG. 7 is a side view of the power tool provided in FIG. 5;

fig. 8 is an enlarged view at B of fig. 7;

fig. 9 is a sectional view of a power tool according to a fourth embodiment of the present invention;

FIG. 10 is a schematic view of a portion of the structure of FIG. 9;

in the figure:

10. a working assembly; 20. a power source;

1. a body shell; 11. a first housing portion; 12. a second housing portion; 13. a third housing portion;

2. a control mechanism;

3. a motor; 31. a bearing;

4. a motor lead;

5. an operating member; 51. a push button; 52. a push rod;

6. a signal switch; 61. a trigger section;

7. a control wire;

8. a reversing piece.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

Referring to fig. 1 and 2, an electric tool according to a first embodiment of the present invention includes a main body, a working assembly 10 and a power supply 20, the working assembly 10 is disposed at a front end of the main body, and the power supply 20 is disposed at a rear end of the main body. The electric tool is a handheld electric tool, in particular to a direct-current angle grinder. Of course, power tools include, but are not limited to, screwdrivers, drills, wrenches, sanding devices, jig saws, and the like that require power.

The fuselage includes fuselage casing 1, and fuselage casing 1 includes first casing portion 11, second casing portion 12 and the third casing portion 13 that from preceding back arranges in proper order, and first casing portion 11 is connected with work subassembly 10, and third casing portion 13 is connected with power 20.

The electric tool also comprises a control mechanism 2, a motor 3 and an operating component 5, wherein the control mechanism 2 is arranged in the machine body shell 1 and is used for controlling the operation of the working component 10, the control mechanism 2 is electrically connected with a power supply 20, the motor 3 is arranged in the first shell part 11, and the motor 3 is electrically connected with the control mechanism 2 through a motor lead 4; the operation member 5 is provided on the body casing 1.

The electric tool also comprises a signal switch 6, the signal switch 6 is electrically connected with the control mechanism 2 through a control lead 7, and the motor lead 4 is arranged separately from the signal switch 6; the operating member 5 is arranged to be displaced on the body housing 1 to open or close a signal switch 6, the signal switch 6 controlling the start or stop of the motor 3, the operating member 5 and the motor lead 4 being located on both sides of the signal switch 6, respectively.

The motor lead 4 and the signal switch 6 are separated, the signal switch 6 with smaller volume can be adopted to control the motor 3, the occupied space is small, the motor 3 and the signal switch 6 are respectively and electrically connected with the control mechanism 2, the internal space of the machine body shell 1 can be fully utilized, and the layout of other components is convenient; the operating component 5 is arranged to move on the body shell 1 to turn on or off the signal switch 6, the operating component 5 and the motor lead 4 are respectively positioned on two sides of the signal switch 6, friction of the operating component 5 on the motor lead 4 in the operating process is avoided, the service life is prolonged, and the failure rate is reduced.

By controlling the operation part 5, the signal switch 6 is triggered to be turned on, the control lead 7 is conducted with the control mechanism 2, and the control mechanism 2 controls the power supply 20 to be conducted with the motor 3 through the motor lead 4, so that the motor 3 is started. On the contrary, by controlling the operating part 5 to be away from the signal switch 6, the signal switch 6 is closed, the control lead 7 is disconnected with the control mechanism 2, and the control mechanism 2 controls the power supply 20 to be disconnected with the motor 3, so that the motor 3 is interrupted.

Since the rotational speed and the torque of the electric motor 3 are relatively high, the current carried by the motor line 4 is greater than the current carried by the control line 7.

The motor 3 includes a motor shaft having a rotation axis extending in the front and rear of the body housing 1, and a bearing 31 rotatably supporting the motor shaft, the bearing 31 being provided in a bearing chamber in the body housing 1. The bearing chamber includes a front bearing chamber and a rear bearing chamber arranged in the axial direction, and bearings 31 are provided in both the front bearing chamber and the rear bearing chamber.

The operating member 5 is configured to move in the direction of the axis of rotation, the operating member 5 having an initial position. When the operation member 5 is located at the initial position, the operation member 5 is not operated, the signal switch 6 is not triggered, and the trigger portion 61 of the signal switch 6 has a triggered trigger position, specifically, a position where the operation member 5 contacts the trigger portion 61 and the signal switch 6 is triggered. The axial distance between the initial position and the trigger position is h, the axial support distance of the motor 3 is L, the axial support distance of the motor 3 refers to the axial distance from the front end wall of the front bearing chamber of the motor shaft to the rear end wall of the rear bearing chamber of the motor shaft, and h is less than or equal to 2L.

Set up h in above-mentioned within range, reduced signal switch 6's trigger stroke, promote the operation flexibility ratio and the operation of operating part 5 and feel, improve user operation experience. On the other hand, the distance between the signal switch 6 and the control mechanism 2 is increased, and the interference of electronic components on the control mechanism 2 on the signal switch 6 is reduced. Wherein h and L are indicated in FIG. 1.

In the present embodiment, the control mechanism 2 is provided in the third housing portion 13. The power source 20 is a battery pack, and the motor 3 is arranged at a distance from the battery pack, so that the overall weight of the electric tool is distributed conveniently, and the front and the back of the machine body are basically balanced. The wiring is more reasonable, avoids the wiring to be close to the inner wall of fuselage casing 1 in order to reduce the risk that the striking leads to becoming invalid by fuselage casing 1 when falling.

In the present embodiment, the signal switch 6 is disposed in the first housing portion 11, the second housing portion 12 forms a holding portion, and the second housing portion 12 is disposed for guiding the motor wires 4 and the control wires 7, so that the space of the first housing portion 11 is fully utilized, and meanwhile, since no other components are disposed in the second housing portion 12, the size of the second housing portion 12 is further reduced, and the holding by a user is facilitated. The size is less for it is more comfortable, the operation is more convenient to grip, promotes user's operation comfort level.

The signal switch 6 is located at one side of the bearing chamber, and a wiring passage allowing the motor lead 4 to pass through is formed at the other side of the bearing chamber in the body housing 1. The wiring channel and the signal switch 6 are respectively positioned at two radial sides of the motor shaft. Utilize the motor shaft, realize that motor wire 4 and signal switch 6 set up separately, need not additionally to increase the structure, make full use of fuselage casing 1's inner space.

The motor lead 4 and the operating part 5 are respectively positioned at two sides of the rotation axis of the motor shaft, so that the operating part 5 and the motor lead 4 are arranged at intervals, and the abrasion of the operating part 5 to the motor lead 4 is avoided. Specifically, the operating component 5 and the signal switch 6 are located on the same side of the body housing 1, so that the operating component 5 can trigger the signal switch 6 conveniently.

In the first embodiment, the trigger portion 61 of the signal switch 6 is provided in the front-rear direction in the body casing 1, and the operation member 5 slides in the front-rear direction of the body casing 1. The operation component 5 comprises a push button 51 and a push rod 52, the push button 51 is located outside the body housing 1 and is connected with the body housing 1 in a sliding manner, and the push rod 52 is located inside the body housing 1 and can drive the trigger part 61 to move. The trigger 61 is movable in a straight line to turn on and off the motor 3. When the trigger part 61 is pressed by external force, the signal switch 6 is in a closed state, and the motor 3 is started; when the external force is removed and the trigger part 61 rebounds, the signal switch 6 is in an off state, and the motor 3 is closed.

Specifically, one end of the push rod 52 is provided with a bent portion, which is in contact with the trigger portion 61. When the push button 51 slides forward, the push rod 52 moves forward, and acts on the trigger 61 through the bent portion, pressing the trigger 61. In order to improve the operation feeling and facilitate the return of the push rod 52, a return spring may be provided on the push rod 52.

The outer diameter of the second housing portion 12 is smaller than the outer diameter of the first housing portion 11, and the second housing portion 12 is offset from the first housing portion 11 in a direction toward the operation member 5. Reducing the space available for the second housing portion 12 facilitates handling by the operator.

As an alternative embodiment, the signal switch 6 may be provided in a transition region between the first housing portion 11 and the second housing portion 12, where the transition region is a region where the outer diameter connecting the first housing portion 11 and the second housing portion 12 changes. Due to the structural features of the first housing portion 11 and the second housing portion 12, the internal space of the body housing 1 is fully utilized, and the layout of other components in the body housing 1 is not affected.

Wherein a solution for triggering or disengaging the signal switch 6 in the fore-and-aft direction of the body by means of a fore-and-aft movement of the operating member 5 is schematically shown in fig. 1-2.

Fig. 3 and 4 show a second embodiment of the invention, wherein the same or corresponding parts as in the first embodiment are provided with the same reference numerals as in the first embodiment. For the sake of simplicity, only the differences between the second embodiment and the first embodiment will be described. The difference is that the signal switch 6 is arranged approximately perpendicular to the axis of rotation of the electric motor 3 in the fuselage housing 1. Specifically, the signal switch 6 is provided in the body housing 1 in the up-down direction. In this case, a reversing element 8 is further included, which is arranged between the operating element 5 and the signal switch 6, wherein the reversing element 8 is an elastic element, in particular a leaf spring. Wherein the operating member 5 is configured to move in a first direction to deform the elastic member, and the trigger 61 is configured to move in a second direction perpendicular to the first direction, wherein the first direction refers to a direction parallel to the rotation axis of the motor 3, specifically, a front-rear direction in fig. 3 and 4, and the second direction refers to a direction approximately perpendicular to the rotation axis of the motor 3, specifically, an up-down direction in fig. 3 and 4, driven by the deformation of the elastic member. In fig. 3, "front" indicates front, "upper" indicates upper, and the direction in fig. 4 refers to fig. 3.

As shown in fig. 3, one end of the leaf spring is fixedly connected to the signal switch 6, and the other end of the leaf spring is a free end, and the operating member is in contact with the free end. Of course, as shown in fig. 4, one end of the leaf spring is fixedly connected to the body housing 1, the other end of the leaf spring is a free end, and the push rod 52 of the operation member 5 is in contact with the free end of the leaf spring.

Fig. 3 and 4 schematically show a scheme for triggering or disengaging the signal switch 6 in the up-down direction of the body housing 1 by moving the operating member 5 back and forth.

Fig. 5 to 8 show a third embodiment of the invention, wherein the same or corresponding parts as the second embodiment are provided with the same reference numerals as the second embodiment. For the sake of simplicity, only the points of difference between the third embodiment and the second embodiment will be described. The difference is that the signal switch 6 is disposed in the body housing 1 along the left-right direction of the body housing 1. Likewise, the embodiment further comprises a reversing element 8 arranged between the operating part 5 and the signal switch 6, wherein the reversing element 8 is an elastic element, in particular a leaf spring. Wherein the operating member 5 is configured to move in a first direction to deform the elastic member 8, and the trigger portion 61 is configured to move in a second direction perpendicular to the first direction, wherein the first direction refers to a direction parallel to the rotation axis of the motor 3, specifically, a front-rear direction in fig. 5 and 7, and the second direction refers to a direction approximately perpendicular to the rotation axis of the motor 3, specifically, a left-right direction in fig. 5, driven by the deformation of the elastic member. In fig. 5, "front" means front and "right" means right; in fig. 7, "front" indicates a front side and "upper" indicates an upper side.

Likewise, one end of the leaf spring in this embodiment is a free end, and the push rod 52 of the operation member 5 is in contact with the leaf spring free end. Alternatively, one end of the leaf spring may be fixedly connected to the signal switch 6, and the other end of the leaf spring may be a free end, and the operating member may be in contact with the free end.

Wherein fig. 5 to 8 schematically show a scheme of activating or disengaging the signal switch 6 in the left-right direction of the body by the forward and backward movement of the operation member 5.

Fig. 9 and 10 show a fourth embodiment of the invention, wherein the same or corresponding parts as in the first embodiment are provided with the same reference numerals as in the first embodiment. For the sake of simplicity, only the points of difference between the fourth embodiment and the first embodiment will be described. The difference is that the signal switch 6 is arranged in the second housing part 12, the space of the second housing part 12 is fully utilized, the size of the first housing part 11 can be effectively reduced, and the axial layout is more reasonable.

The second housing portion 12 is formed with a holding portion, the operation component 5 can be a trigger assembly arranged on the body housing 1, the trigger assembly is pivoted with the body housing 1, and the signal switch 6 is operated through the trigger assembly, so that the operation is more convenient, and the operation comfort of a user is improved. Specifically, the trigger assembly is located on the lower side of the body housing 1, and the trigger portion 61 of the signal switch 6 is disposed over.

Similarly, the signal switch 6 may be disposed in the first housing portion 11, or disposed in a transition region between the first housing portion 11 and the second housing portion 12, where the outer diameter of the transition region is changed to connect the first housing portion 11 and the second housing portion 12.

According to the electric tool provided by the invention, the motor lead 4 and the signal switch 6 are separately arranged, the signal switch 6 with a smaller volume can be adopted, the occupied space is small, the motor 3 and the signal switch 6 can be respectively and electrically connected with the control mechanism 2, the internal space of the machine body shell 1 is fully utilized, and the layout of other components is convenient; the operating component 5 is arranged on the machine body shell 1 in a shifting mode to open or close the signal switch 6, the operating component 5 and the motor lead 4 are arranged at intervals, abrasion of the operating component 5 to the motor lead 4 is avoided, the service life is prolonged, and the failure rate is reduced.

The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.