An electric tool

Abstract

The present invention discloses an electric tool, which belongs to the technical field of power tools, and comprises a housing, a motor located in the housing, and a reduction mechanism connected to the rotating shaft of the motor. The housing is straight-cylindrical, and comprises a head housing, a gripping portion, and a tail housing connected in sequence. The reduction mechanism is located in the head housing, and the motor is located in the gripping portion. The rotating shaft of the motor is perpendicular to the output shaft of the reduction mechanism. The motor is an outer rotor motor, and the output line of the motor is located between the motor and the reduction mechanism. The housing does not adopt the T-shaped structure commonly seen in the prior art, which reduces the occupied space and is convenient for use and transportation. The motor used is an outer rotor motor, which occupies a smaller space, provides a larger torque, and reduces the overall volume of the electric tool. The output line is located between the motor and the reduction mechanism, so that the space is fully utilized, the volume of the housing of the electric tool is reduced, and it is convenient to use and transport.

Description

Technical Field

[0001] The present invention relates to the technical field of power tools, and in particular to an electric tool. Background Art

[0002] Common power tools include: screwdrivers, drills, electric hammers, sanders, reciprocating saws, jigsaws, circular saws, etc. Power tools driven by electricity are usually called power tools.

[0003] In power tools, motors are generally used as driving mechanisms, and power is transmitted to the working head through a reduction mechanism. The motors generally use inner rotor motors, which take up a large space, making the power tool larger in size and weight, causing many inconveniences in use and transportation. In addition, whether DC or AC is used, the motor needs to be connected to the power supply with a wire. The layout of the wires does not fully consider the space inside the power tool, making the outer shell of the power tool larger in size. Summary of the invention

[0004] The object of the present invention is to provide an electric tool to solve the technical problem of large size of the electric tool in the prior art.

[0005] As conceived above, the technical solution adopted by the present invention is:

[0006] An electric tool comprises a housing, a motor located in the housing and a reduction mechanism connected to the rotating shaft of the motor, wherein the housing is straight-cylindrical and comprises a head housing, a gripping portion and a tail housing connected in sequence, the reduction mechanism is located in the head housing, the motor is located in the gripping portion, the rotating shaft of the motor is perpendicular to the output shaft of the reduction mechanism; the motor is an outer rotor motor, and the output line of the motor is located between the motor and the reduction mechanism.

[0007] Wherein, a centrifugal fan is arranged at one end of the motor, and an axial flow fan is arranged at the other end of the motor, and the centrifugal fan is located at one end of the motor close to the speed reduction mechanism.

[0008] An air outlet is provided at a position of the holding portion corresponding to the centrifugal fan, a first air inlet is provided on the head shell, and a second air inlet is provided on the side of the tail shell.

[0009] Wherein, the air outlet is located at the bottom of the gripping portion, the first air inlet is located at the front side of the head shell, and the second air inlet is provided on two opposite sides of the tail shell.

[0010] Wherein, an air guide cover is provided on the outer surface of the motor, the air guide cover is fixedly connected to the outer shell, and the air guide cover is spaced apart from the motor.

[0011] Wherein, one end of the wind guide cover is provided with a wind shield, and the wind shield is located on a side of the centrifugal fan away from the air outlet.

[0012] One end of the output line is located between the motor and the speed reduction mechanism, and the other end of the output line bypasses the outer side of the air guide cover and extends in a direction away from the speed reduction mechanism.

[0013] Wherein, a circuit board is arranged inside the holding portion at a side of the motor away from the speed reduction mechanism, and the output line bypasses the outside of the motor and is connected to the circuit board.

[0014] Among them, the battery pack is detachably connected to the tail shell, and a socket is provided inside the tail shell, and the socket is electrically connected to the battery pack.

[0015] Wherein, an outlet is provided at a position at the bottom of the head shell corresponding to the output shaft of the speed reduction mechanism, and a speed regulating button is provided at the top of the head shell.

[0016] Beneficial effects of the present invention:

[0017] The housing of the electric tool proposed by the present invention does not adopt the T-shaped structure commonly used in the prior art, which reduces the occupied space and is convenient for use and transportation. The rotating shaft of the motor is perpendicular to the output shaft of the reduction mechanism, which makes full use of the space and is convenient for operators to hold and use. The motor used is an outer rotor motor, which occupies a small space, provides a large torque, and reduces the overall volume of the electric tool; the output line of the motor is located between the motor and the reduction mechanism, so that the space between the motor and the reduction mechanism is fully utilized, the volume of the housing of the small electric tool is reduced, and it is more convenient to use and transport. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of an electric tool provided by an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A cross-sectional view of

[0020] Figure 3 yes Figure 2 Schematic diagram of the structure of the middle part;

[0021] Figure 4 is a schematic diagram of the exploded structure of a motor of an electric tool provided in an embodiment of the present invention;

[0022] Figure 5 It is a cross-sectional view of the electric tool provided in the second embodiment of the present invention.

[0023] In the figure:

[0024] 1. Shell; 11. Head shell; 111. First air inlet; 12. Grip; 121. Air outlet; 13. Tail shell; 131. Second air inlet;

[0025] 2. Motor; 21. Output line; 22. Rotating shaft; 23. Outer rotor; 24. Stator; 25. Centrifugal fan; 26. Axial flow fan;

[0026] 3. Speed ​​reduction mechanism;

[0027] 4. Circuit board;

[0028] 5. Socket;

[0029] 6. Control switch;

[0030] 7. Speed ​​adjustment button;

[0031] 8. Wind guide hood; 81. Wind shield. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0036] Embodiment 1

[0037] See also Figures 1 to 4 The present invention provides an electric tool, which may be an angle grinder, a sanding machine, a polisher, an oscillating tool, etc., and is not limited here. The electric tool includes a housing 1, a motor 2 located in the housing 1, and a reduction mechanism 3 connected to the output shaft of the motor 2. Of course, it also includes a working head connected to the reduction mechanism 3, and the working head is installed on the output shaft of the reduction mechanism 3. The motor 2 drives the working head to move through the reduction mechanism 3.

[0038] The housing 1 is in a straight cylindrical shape, and includes a head housing 11, a gripping portion 12, and a tail housing 13 connected in sequence. The housing 1 does not adopt the T-shaped structure commonly used in the prior art, which reduces the occupied space and is convenient for use and transportation. The motor 2 is located in the gripping portion 12, the reduction mechanism 3 is located in the head housing 11, and the rotating shaft 22 of the motor 2 is perpendicular to the output shaft of the reduction mechanism 3, so that the working head is arranged on one side of the housing 1, which is convenient for the operator to hold and use.

[0039] The motor 2 is an outer rotor motor, and the output line 21 of the motor 2 is located between the motor 2 and the reduction mechanism 3. The outer rotor motor is small in size, occupies a small space, provides a large torque, and reduces the overall size of the power tool; the position of the output line 21 makes full use of the space between the motor 2 and the reduction mechanism 3, reduces the size of the housing 1 of the small power tool, and is more convenient to use and transport.

[0040] In order to prevent the housing 1 from interfering with the outer rotor 23 of the motor 2, the housing 1 and the outer rotor 23 of the motor 2 must be spaced apart. One end of the motor 2 is connected to the speed reduction mechanism 3, and the other end of the motor 2 is connected to the housing 1. The housing 1 is connected to the stator 24 of the motor 2 to provide support for the motor 2.

[0041] A centrifugal fan 25 is provided at one end of the motor 2, and an axial flow fan 26 is provided at the other end of the motor 2. The centrifugal fan 25 is located at one end of the motor 2 close to the speed reduction mechanism 3. The axial flow fan 26 is used to guide the airflow in, and the centrifugal fan 25 is used to guide the airflow out. The airflow flows in the housing 1 and takes away the heat in the housing 1. In order to enable the motor 2 to drive the centrifugal fan 25 and the axial flow fan 26 to rotate, the centrifugal fan 25 and the axial flow fan 26 are both connected to the outer rotor 23.

[0042] An air outlet 121 is provided at a position corresponding to the grip portion 12 and the centrifugal fan 25, a first air inlet 111 is provided on the head shell 11, and a second air inlet 131 is provided on the side of the tail shell 13. A heat dissipation channel is formed between the first air inlet 111 and the air outlet 121, and between the second air inlet 131 and the air outlet 121, which can dissipate heat for both the speed reduction mechanism 3 and the motor 2, thereby improving the cooling effect.

[0043] Specifically, the air outlet 121 is located at the bottom of the grip portion 12, and air is discharged downward when in use without affecting the operation of the top; the first air inlet 111 is located on the front side of the head shell 11, so that the air intake is unobstructed and ventilation is smooth; second air inlets 131 are provided on the opposite sides of the tail shell 13 to increase the ventilation area, facilitate convection, and facilitate heat dissipation.

[0044] A circuit board 4 is arranged inside the grip 12 on the side of the motor 2 away from the speed reduction mechanism 3, and the output line 21 bypasses the outside of the motor 2 and connects to the circuit board 4. The output line 21 can extend along the inner wall of the housing 1 to prevent the output line 21 from contacting the outer rotor 23 of the motor 2.

[0045] The tail shell 13 is detachably connected with a battery pack, which can be replaced and is convenient to be removed for charging. A socket 5 is provided inside the tail shell 13, and the socket 5 is electrically connected to the battery pack. Of course, a control switch 6 is also provided on the outer shell 1 to control the power on and off of the motor 2. Specifically, the control switch 6 is provided at the top of the grip 12 for easy operation.

[0046] An outlet is provided at the bottom of the head shell 11 at a position corresponding to the output shaft of the speed reduction mechanism 3, and the output shaft extends out of the opening. A speed adjustment button 7 is provided at the top of the head shell 11, and the speed adjustment button 7 is connected to the circuit board 4. The setting position of the speed adjustment button 7 allows the rotation of the output shaft to be observed while adjusting the speed, and the speed adjustment is more intuitive.

[0047] Embodiment 2

[0048] Figure 5 Embodiment 2 is shown, in which the parts identical or corresponding to those in Embodiment 1 are marked with the corresponding reference numerals in Embodiment 1. For the sake of simplicity, only the differences between Embodiment 2 and Embodiment 1 are described. The difference is that an air guide hood 8 is sleeved on the outside of the motor 2, the air guide hood 8 is fixedly connected to the housing 1, and the air guide hood 8 and the motor 2 are spaced apart. The air guide hood 8 can not only guide the airflow generated by the axial fan 26 to the air outlet 121, but also aggregate the outwardly diverging airflow generated by the centrifugal fan 25, so that the airflow flows through the outer surface of the motor 2 and takes away the heat and flows out from the air outlet 121. The connection between the air guide hood 8 and the housing 1 can be a snap-on connection or a screw connection, which is not limited here. The air guide hood 8 and the motor 2 are spaced apart because the motor 2 is an outer rotor motor to prevent the air guide hood 8 from interfering with the rotation of the outer rotor 23.

[0049] One end of the wind guide cover 8 has a wind shield 81, which is located on the side of the centrifugal fan 25 away from the air outlet 121. The air outlet 121 is arranged at a position on the grip 12 corresponding to the centrifugal fan 25, so that the divergent airflow generated by the centrifugal fan 25 can flow out from the air outlet 121. The arrangement of the wind shield 81 can block part of the divergent airflow generated by the centrifugal fan 25 from flowing in a direction away from the air outlet 121. The wind shield 81 blocks part of the airflow, so that most of the airflow can flow out from the air outlet 121, thereby preventing heat accumulation in the housing 1 and further improving the cooling effect.

[0050] After the air guide cover 8 is provided, one end of the output line 21 is located between the motor 2 and the speed reduction mechanism 3, and the other end of the output line 21 bypasses the outside of the air guide cover 8 and extends in a direction away from the speed reduction mechanism 3. The provision of the air guide cover 8 isolates the output line 21 from the motor 2, and under the protection of the air guide cover 8, the output line 21 will not touch the outer rotor 23 of the motor 2.

[0051] In order to prevent the extension of the output line 21 from blocking the air outlet 121, the output line 21 is extended along the air guide cover 8 outside the wind shield 81 of the air guide cover 8. Specifically, the air guide cover 8 is cylindrical, and the output line 21 extends along the axis of the motor 2, that is, along the axis of the air guide cover 8.

[0052] When in use, the control switch 6 is turned on, and the motor 2 drives the speed reduction mechanism 3 to transfer power to the output shaft, so that the working head moves. At this time, the centrifugal fan 25 and the axial flow fan 26 rotate, forming a negative pressure inside the housing 1, and the outside wind enters from the first air inlet 111 and the second air inlet 131. Under the action of the wind guide 8, the wind flows along the outer surface of the motor 2, and under the action of the centrifugal fan 25, it flows out from the air outlet 121.

[0053] Of course, the speed reduction mechanism 3 is a bevel gear transmission mechanism or other, which is not limited here. An anti-slip sleeve is sleeved on the housing 1, which will not be described in detail here.

[0054] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An electric tool, comprising a housing (1), a motor (2) located in the housing (1), and a speed reduction mechanism (3) connected to a rotating shaft (22) of the motor (2), characterized in that: The housing (1) is in a straight cylindrical shape, comprising a head housing (11), a gripping portion (12) and a tail housing (13) connected in sequence, the speed reduction mechanism (3) is located in the head housing (11), the motor (2) is located in the gripping portion (12), and the rotating shaft (22) of the motor (2) is perpendicular to the output shaft of the speed reduction mechanism (3); The motor (2) is an outer rotor motor, and an output line (21) of the motor (2) is located between the motor (2) and the speed reduction mechanism (3); a circuit board (4) is provided on a side of the motor (2) away from the speed reduction mechanism (3), and the output line (21) bypasses the outside of the motor (2) and is connected to the circuit board (4); The outer surface of the motor (2) is provided with an air guide cover (8), the air guide cover (8) is fixedly connected to the housing (1), and the air guide cover (8) and the motor (2) are spaced apart; The motor further comprises an axial flow fan, the outer rotor is connected to the rotating shaft via the axial flow fan, and the axial flow fan is arranged on a side close to the circuit board.

2. The electric tool according to claim 1, characterized in that: A centrifugal fan (25) is provided at one end of the motor (2), and the axial flow fan (26) is provided at the other end of the motor (2). The centrifugal fan (25) is located at one end of the motor (2) close to the speed reduction mechanism (3).

3. The electric tool according to claim 2, characterized in that: An air outlet (121) is provided at a position of the gripping portion (12) corresponding to the centrifugal fan (25), a first air inlet (111) is provided on the head shell (11), and a second air inlet (131) is provided on the side of the tail shell (13).

4. The electric tool according to claim 3, characterized in that: The air outlet (121) is located at the bottom of the gripping portion (12), the first air inlet (111) is located at the front side of the head shell (11), and the second air inlet (131) is provided on two opposite sides of the tail shell (13).

5. The electric tool according to claim 3, characterized in that: One end of the wind guide cover (8) is provided with a wind shield (81), and the wind shield (81) is located on a side of the centrifugal fan (25) away from the air outlet (121).

6. The electric tool according to claim 3, characterized in that: One end of the output line (21) is located between the motor (2) and the speed reduction mechanism (3), and the other end of the output line (21) bypasses the outer side of the air guide cover (8) and extends in a direction away from the speed reduction mechanism (3).

7. The electric tool according to any one of claims 1 to 6, characterized in that: The circuit board (4) is arranged inside the holding portion (12).

8. The electric tool according to any one of claims 1 to 6, characterized in that: A battery pack is detachably connected to the tail shell (13), and a socket (5) is provided inside the tail shell (13), wherein the socket (5) is electrically connected to the battery pack.

9. The electric tool according to any one of claims 1 to 6, characterized in that: An outlet is provided at a position at the bottom of the head shell (11) corresponding to the output shaft of the speed reduction mechanism (3), and a speed adjustment button (7) is provided at the top of the head shell (11).

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