Power source and power tool suitable for the power source

Abstract

The present invention discloses a power source and a power tool applicable to the power source, comprising: a motor including a motor shaft extending along a first straight line direction; the motor includes a stator and a rotor; the stator includes connecting arms for winding windings, the connecting arms are distributed around the stator, and there are gaps between adjacent connecting arms; the motor further includes a filling member for filling at least part of the gaps; the filling member includes: insertion pieces filled into the gaps; a first joint portion connecting the first ends of the insertion pieces; the first joint portion extends around the first straight line and is formed with a commutation portion, and the commutation portion divides at least part of the stator and the space outside the stator. The power source and the power tool applicable to the power source have high coaxiality and low wind noise.

Description

Technical Field

[0001] The present invention relates to a power source and a power tool applicable to the power source. Background Art

[0002] As an element for driving a power tool to work, in the power source, the motor rotates to generate a driving force. For some motors with relatively high rotational speeds, the relative rotation between the rotor and the stator will generate a certain degree of noise. At the same time, when the rotor rotates, it will also generate a certain degree of noise due to friction with the airflow. In addition, when the motor is fixed to the housing of the power tool, the housing also needs to be formed with a receiving groove for receiving the motor. However, when the motor is installed in the housing, its motor shaft is supported by bearings installed on the housing. It is very difficult in the process for the bearing chamber for installing the bearings and the receiving groove for installing the motor to enable the motor shaft to be stressed in a straight line direction during assembly. That is, generally, the part of the motor shaft inside the motor and the part outside the motor are not coaxial, and their coaxiality needs to be calibrated multiple times to meet the output requirements. How to provide a power source that can effectively reduce wind noise and can easily achieve high coaxiality is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0003] To solve the deficiencies of the prior art, the purpose of the present invention is to provide a power source that can effectively reduce wind noise and can achieve relatively high coaxiality, and a power tool applicable to the power source.

[0004] To achieve the above objectives, the present invention adopts the following technical solutions:

[0005] A power source, comprising: a motor, including a motor shaft extending along a first straight line direction; the motor includes a stator and a rotor; the stator includes connecting arms for winding windings, the connecting arms are distributed around the stator, and there are gaps between adjacent connecting arms; the motor further includes a filling member for filling at least part of the gaps; the filling member includes: inserting pieces filled into the gaps; a first joint portion connecting the first ends of the inserting pieces; the first joint portion extends around the first straight line and is formed with a rectifying portion, and the rectifying portion divides at least part of the stator and the space outside the stator.

[0006] Further, the rectifying portion includes an extending surface extending radially around the first straight line, and the extending surface can extend to a preset length.

[0007] Further, when the windings are wound around the connecting arms, the inserting pieces are arranged between the gaps of the connecting arms and the windings.

[0008] Further, it further includes: a first cover body, forming a first through hole through which the motor shaft can pass; a second cover body, connected to the first cover body and forming a second through hole through which the motor shaft can pass; when the first cover body and the second cover body are connected, a receiving cavity for receiving the motor is formed, and the first through hole, the second through hole and the motor shaft have a concentric axis parallel to the first straight line.

[0009] Further, the filler further includes: a second engaging portion, connecting to the second end of the insertion piece, the second engaging portion is formed with a bayonet, and a structural rib is formed at one end of the second cover body away from the first cover body, and the bayonet can be fixed to the structural rib.

[0010] Further, the first cover body and the second cover body further form a bearing chamber for receiving a bearing, and the bearing is used to support the motor shaft; when the motor shaft is supported by the bearing disposed in the bearing chamber, the motor shaft and the bearing have a concentric axis parallel to the first straight line.

[0011] Further, the power source further includes a fan connected to the motor shaft, and the fan is located between the first engaging portion and the first cover body.

[0012] Further, the rotational speed of the motor is greater than or equal to 33000 r / min and less than or equal to 39000 r / min.

[0013] A power source, including: a motor, including a motor shaft extending in the first straight line direction; a first cover body, forming a first through hole through which the motor shaft can pass; a second cover body, connected to the first cover body and forming a second through hole through which the motor shaft can pass; when the first cover body and the second cover body are connected, a receiving cavity for receiving the motor is formed, and the first through hole, the second through hole and the motor shaft have a concentric axis parallel to the first straight line; the motor includes a stator and a rotor; the stator includes connecting arms for winding windings, the connecting arms are distributed around the stator, and there are gaps between adjacent connecting arms; the motor further includes a filler for filling at least part of the gaps.

[0014] An electric tool, including the power source of any one of the foregoing.

[0015] The beneficial effect of the present invention is that: by providing a rectifying portion, the rectifying portion can partition at least part of the space between the stator and the space outside the stator, reducing the noise of the motor. Description of the Drawings

[0016] Figure 1 is a perspective view of the power source;

[0017] Figure 2 is Figure 1 a perspective view of the power source in

[0018] Figure 3 is a perspective view of the electric drill;

[0019] Figure 4 is Figure 1 a schematic exploded view of the power source in

[0020] Figure 5 is Figure 4 a schematic exploded view of another perspective of the power source in

[0021] Figure 6 is Figure 4 a cross-sectional view of the power source in

[0022] Figure 7 is Figure 4 a further schematic exploded view of the power source in

[0023] Figure 8 is Figure 7 a schematic exploded view of another perspective of the power source in

[0024] Figure 9 is Figure 8 a perspective view of the stator of the power source in

[0025] Figure 10 is Figure 8 a perspective view of the filler of the power source in

[0026] Figure 11 is Figure 4 a perspective view of the fan of the power source in Detailed implementation manners

[0027] Figures 1 to 2 The power source 100 shown includes: a first cover 11, a second cover 12, and a motor 13. Among them, the first cover 11 and the second cover 12 are connected to form a receiving cavity for receiving the motor 13. The motor 13 includes a motor shaft 134 and is fixed by the first cover 11 and the second cover 12.

[0028] Figure 3An electric tool applicable to a power source 100 is shown. As an implementation, the electric tool may specifically be a drill 14, and the drill 14 includes: a housing 141 and a power output portion 142. The housing 141 is formed with a receiving portion and a handle portion. Among them, the power output portion 142 and the power source 100 are at least partially disposed in the receiving portion, and the handle portion can be held by a user to operate the drill 14. Since the power source 100 is a separate part, the motor 13 therein has been fixed by the first cover 11 and the second cover 12, and the housing 141 of the drill 14 does not need to form a receiving groove for receiving the motor 13, but only needs to form a cavity for receiving the power source 100. In fact, when the housing 141 forms a receiving groove for receiving the motor 13, it has extremely high technological requirements. When the motor 13 is installed in the housing 141, the receiving groove of the housing 141 for receiving the motor 13 and the bearing chamber for receiving the bearing 15 need to be corrected multiple times to meet the actual coaxiality requirements of the motor 13. That is, after the motor 13 is installed in the receiving groove, the motor shaft 134 is supported by the bearing 15, and the bearing 15 is located in the bearing chamber. The motor shaft 134 cannot achieve true coaxiality from the receiving groove to the bearing chamber, and there will be a deviation in force, which will exacerbate the wear between the stator 131 and the rotor 132 of the motor 13. However, in the power source 100 of this embodiment, the motor 13 has been fixed in the first cover 11 and the second cover 12, and its coaxiality has been calibrated before being installed in the housing 141. In addition, by fixing the motor 13 with the first cover 11 and the second cover 12, its coaxiality can be more easily improved.

[0029] As Figures 4 to 5As shown in the figure, both the first cover 11 and the second cover 12 extend along a first straight line 101 parallel to the motor shaft 134. The first cover 11 forms a first through hole 111 through which the motor shaft 134 can pass, and the second cover 12 forms a second through hole 121 through which the motor shaft 134 can pass. The centers of the first through hole 111, the center of the second through hole 121, and the axis of the motor shaft 134 are substantially on the same straight line. That is, the first cover 11, the second cover 12, and the motor 13 are coaxial. It can be understood that the first cover 11 and the second cover 12 actually divide the receiving groove and the bearing chamber of the housing 141 for installing the motor 13 into a separate part, so as to better improve the coaxiality between the motor shaft 134 of the motor 13 and the bearing chamber. In this embodiment, the bearings 15 for supporting the motor shaft 134 are respectively installed in the first through hole 111 and the second through hole 121. The first cover 11 and the second cover 12 are connected into a whole by fixing members 16. That is, in this embodiment, the bearings for supporting the motor shaft 134 are arranged in the first cover 11 and the second cover 12, so that the original bearing chamber for accommodating the bearings is separated from the housing 141 of the motor 13 to be installed, and the bearing chamber exists modularly on the power source 100 body. Thus, the debugging work when the power source is assembled to the housing 141 can be effectively reduced. In fact, since the motor shaft 134 of the motor 13 has achieved a high coaxiality requirement through the fixation of the first cover 11 and the second cover 12, the power source 100, as a power unit, can be arranged on any connectable housing 141 without considering whether the motor shaft 134 and the bearing chamber can achieve a high coaxiality when the housing 141 installs the motor 13, thereby improving the versatility of the motor 13. In fact, the power source 100 in this embodiment is applicable to any electric tool, and the difference is only that the required output power of different electric tools is different, and different power output requirements only need to adjust the parameters of the motor 13 itself.

[0030] As Figures 6 to 9 shown in the figure, the motor 13 includes a stator 131 and a rotor 132. Both the stator 131 and the rotor 132 extend along the first straight line 101 to a preset length. As an implementation manner, the rotor 132 is arranged in the stator 131 and can rotate relative to the stator 131. In fact, it can be understood that the rotor 132 can also be arranged outside the stator 131 and rotate relative to the stator 131. The stator 131 is formed with a through hole through which the rotor 132 can pass, and the rotor 132 can rotate freely in the through hole. The stator 131 further includes an iron core 131a and a winding 131b. The iron core 131a is formed with connecting arms 131c for winding the winding 131b. The connecting arms 131c are distributed around the first straight line 101 and are located in the through hole. In order to facilitate winding the winding 131b, a large gap 131d is left between the connecting arms 131c. In fact, as Figure 9As shown, after the winding 131b is wound around the connecting arm 131c and the gap 131d is filled, there are still many gaps 131d that are not fully filled. During the high-speed rotation of the rotor 132 in the stator 131, the rotor 132 will exert a certain force on the stator 131. Especially for the motor 13 with a relatively high rotational speed, when the rotational speed of the rotor 132 is greater than or equal to 33000 r / min, the rotor 132 will exert a large force on the stator 131. When the rotational speed of the rotor 132 is greater than or equal to 33000 r / min and less than or equal to 39000 r / min, this force will cause relative movement between the respective connecting arms 131c of the stator 131, thereby generating a large amount of noise. It can be understood that it is precisely due to the existence of the gap 131d that the connecting arm 131c has a movement space capable of generating relative movement. As an implementation manner, in order to fully fill the space between the respective connecting arms 131c after the winding 131b is wound around the connecting arm 131c, the motor 13 further includes a filling member 133 for filling the gap 131d between the connecting arms 131c. The filling member 133 can fully fill the gap 131d remaining after the connecting arm 131c of the iron core 131a is wound with the winding 131b, and can at least partially enclose the space of the winding 131b of the iron core 131a along the direction of the first straight line 101.

[0031] As Figure 10 shown, the filling member 133 includes: an insertion piece 133a, a first joint portion 133b, and a second joint portion 133d. Among them, the insertion piece 133a is used to fully fill into the gap 131d of the connecting arm 131c, and the number of insertion pieces 133a corresponds to the gap 131d between the connecting arms 131c. Since there are certain protrusions or grooves when the winding 131b is wound around the connecting arm 131c. That is, the winding 131b is not all evenly wound around the connecting arm 131c. At this time, the insertion piece 133a needs to have a certain elasticity so that it can be filled into the protrusions or grooves formed by the winding 131b, thereby avoiding relative displacement in the gap 131d of the connecting arm 131c due to insufficient filling during the high-speed rotation of the motor 13. On the other hand, due to the relatively fast rotational speed of the motor 13, the insertion piece 133a filled into the gap 131d needs to have a certain strength. However, if the strength is too high, when the insertion piece 133a is inserted into the gap 131d, it will damage the surface of the winding 131b, resulting in a short circuit of the winding 131b wound around each connecting arm 131c, thereby damaging the motor 13. Therefore, in this embodiment, the insertion piece 133a needs to have two characteristics, namely, a certain elastic force and a certain strength. After the insertion piece 133a is inserted into the gap 131d, at this time, the respective connecting arms 131c are connected into a whole through the insertion piece 133a, and the overall stiffness of the stator 131 will be significantly increased.

[0032] The first engaging portion 133b and the second engaging portion 133d are used to connect the insert piece 133a so that the insert piece 133a forms an integral whole. Among them, the first engaging portion 133b has a rectifying portion 133c distributed around the first straight line 101. Specifically, the rectifying portion 133c is a circular ring formed around the first straight line 101, which has an extending surface in the radial direction along the first straight line 101 and can extend to a preset length, so as to enclose at least part of the winding 131b and the rotor 132 in the radial direction along the first straight line 101. It can be understood that when the winding 131b is wound around the connecting arm 131c and the insert piece 133a is inserted into the gap between the connecting arms 131c, there will still be a certain space among the connecting arm 131c, the winding 131b and the insert piece 133a, and the gas can freely flow in this space. When the rotor 132 rotates at a high speed relative to the stator 131, the gas in the above space will flow with the outside gas and will be driven to generate turbulent flow. This turbulent flow makes the motor 13 generate a large amount of noise during operation. In this embodiment, the motor shaft 134 is connected with a fan 17, and the fan 17 is located between the first engaging portion 133b and the first housing 11. The first engaging portion 133b and the first housing 11 cooperate to form a relatively independent accommodating space, and the fan 17 is located in this accommodating space. It can be understood that the rectifying portion 133c divides the space from the inside of the motor 13 to the first housing 11, so that the air flow inside the motor 13 flows in a regular state, that is, the air flow can flow quickly along the circular ring on the first engaging portion 133b, and the air flow will not be chaotic due to the winding 131b and the connecting arm 131c. Thereby, the noise of the fan 17 of the motor 13 is reduced, and the heat dissipation efficiency is increased.

[0033] A bayonet 133e is formed between the second engaging portion 133d and the adjacent two insert pieces 133a, and the bayonet 133e can hold the structural rib 122 at one end of the second housing 12 away from the first housing 11. Thereby, while the filler 133 is fixed to the gap 131d, it is fixed to the second housing 12 again, thereby increasing the stability of the filler 133.

[0034] The noise generated when the fan 17 is working normally mainly comes from the dipole noise, which is formed by the force of the interaction between the air flow and the object changing in space. As Figure 11 shown, in this embodiment, the fan 17 optimizes the fan blade structure, so that the hub ratio in this embodiment is greater than or equal to 0.36 and less than or equal to 0.40, and the thickness of the blade reaches 1 mm, so that the noise of the fan 17 is significantly reduced when the motor 13 rotates at a high speed.

[0035] The basic principles, main features, and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form. Any technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A power source, comprising: a motor including a motor shaft extending in a first linear direction; the motor includes a stator and a rotor; the stator includes connecting arms for winding windings, the connecting arms are distributed around the stator, and there are gaps between adjacent connecting arms; the motor further includes a filling member for filling at least part of the gap; characterized in that the filling member includes: insert pieces filled into the gap; a first joint portion connecting the first ends of the insert pieces; the first joint portion extends around the first straight line and is formed with a rectifying portion, the rectifying portion divides at least part of the stator and the space outside the stator; wherein, the rectifying portion closes at least part of the winding and the rotor in the radial direction along the first straight line, and the rectifying portion is a complete ring.

2. The power source according to claim 1, characterized in that the rectifying portion includes an extending surface extending radially around the first straight line, and the extending surface can extend to a preset length.

3. The power source according to claim 1, characterized in that when the winding is wound around the connecting arm, the insert piece is arranged between the gap of the connecting arm and the winding.

4. The power source according to claim 1, characterized in that further comprising: a first housing forming a first through hole for the motor shaft to pass through; a second housing connected to the first housing and forming a second through hole for the motor shaft to pass through; when the first housing is connected to the second housing, a receiving cavity for receiving the motor is formed, and the first through hole, the second through hole and the motor shaft have a concentric axis parallel to the first straight line.

5. The power source according to claim 4, characterized in that the filling member further includes: a second joint portion connecting the second ends of the insert pieces, the second joint portion is formed with a bayonet, and a structural rib is formed at one end of the second housing away from the first housing, and the bayonet can be fixed to the structural rib.

6. The power source according to claim 4, characterized in that the first housing and the second housing further form a bearing chamber for receiving a bearing, and the bearing is used to support the motor shaft; when the motor shaft is supported by the bearing arranged in the bearing chamber, the motor shaft and the bearing have a concentric axis parallel to the first straight line.

7. The power source according to claim 4, characterized in that the power source further includes a fan connected to the motor shaft, and the fan is located between the first joint portion and the first housing.

8. The power source according to claim 1, characterized in that the rotational speed of the motor is greater than or equal to 33000 r / min and less than or equal to 39000 r / min.

9. A power source, comprising: a motor including a motor shaft extending in a first linear direction; a first housing forming a first through hole for the motor shaft to pass through; a second housing connected to the first housing and forming a second through hole for the motor shaft to pass through; characterized in that When the first cover body is connected to the second cover body, a receiving cavity for receiving the motor is formed, and the first through hole, the second through hole, and the motor shaft have a concentric axis parallel to the first straight line; The motor includes a stator and a rotor; The stator includes connecting arms for winding windings, the connecting arms are distributed around the stator, and there are gaps between adjacent connecting arms; The motor further includes a filling member for filling at least part of the gap; The filling member includes: a first bonding portion, the first bonding portion extends around the first straight line and is formed with a rectifying portion, the rectifying portion closes at least part of the winding and the rotor in the radial direction along the first straight line, and the rectifying portion is a complete ring.

10. An electric tool, Characterized in that, It includes a power source according to any one of claims 1 to 9.

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