power tools

Abstract

This utility model provides an electric tool, including a housing, a motor, a control module, and an airflow guiding element; the housing has an air inlet and an air outlet that are interconnected; the motor is housed within the housing and has a stator and a rotor that are interconnected, the rotor having a motor shaft and a fan mounted on the motor shaft; the control module is disposed within the housing and configured to control the on / off state of the motor; the fan draws in cooling airflow from the air inlet, flows through the control module and the motor, and discharges it from the air outlet; the airflow guiding element includes a first guiding part, a second guiding part, and a third guiding part, the first guiding part abutting against the housing, the second guiding part connecting the first guiding part and the third guiding part; the second guiding part and the third guiding part are provided with abutting ribs that abut against the housing, and the third guiding part at least partially covers the outside of the stator.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a power tool used in decoration, construction and other occasions. Background Technology

[0002] Power tools are work devices powered by an electric power source and driven by a motor through a control module, which then enable end devices to process workpieces. They are favored by users because of their portability and high efficiency.

[0003] However, existing power tools face the problem of excessive heat generation in the control module and motor during operation. If the heat is not dissipated, the tool may burn out. In addition, when the user holds the tool, the contact between the end effector and the workpiece often causes significant vibration to the user's hand, inevitably reducing the user's operating experience and efficiency. Moreover, this vibration can be transmitted through the housing to the internal components of the tool, causing damage to them.

[0004] Therefore, it is determined that it is necessary to provide an improved power tool to overcome the shortcomings of the existing technology. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an electric tool with an airflow guiding element that is conducive to heat dissipation of the whole machine, so as to improve the overall heat dissipation performance of the tool.

[0006] The present invention solves the existing technical problems by adopting the following technical solution: an electric tool, comprising:

[0007] A housing having an air inlet and an air outlet that are interconnected;

[0008] An electric motor, housed within the housing, having a stator and a rotor connected to each other, the rotor having a motor shaft and a fan mounted on the motor shaft;

[0009] A control module is disposed within the housing and configured to control the on / off state of the motor. The fan draws in cooling airflow from the air inlet, flows through the control module and the motor, and exits from the air outlet.

[0010] An airflow guiding element, comprising a first guiding portion, a second guiding portion, and a third guiding portion, wherein the first guiding portion abuts against the housing, and the second guiding portion is connected between the first guiding portion and the third guiding portion;

[0011] The second guide portion and the third guide portion are provided with abutting ribs that abut against the housing, and the third guide portion at least partially covers the outside of the stator.

[0012] A further improvement is as follows: the housing is provided with a gearbox, a first housing and a second housing in sequence along the axial direction, the motor is housed in the first housing, the control module is housed in the second housing, the air inlet is located in the second housing and the air outlet is located in the gearbox.

[0013] A further improvement is as follows: the first guide portion and the abutting rib abut against the first housing; the second guide portion extends at an angle from the surface of the first guide portion toward the motor; the included angle between the second guide portion and the first guide portion is 110 degrees to 150 degrees; the stator has an insulating member disposed at the end; and the second guide portion is axially spaced from the insulating member.

[0014] A further improvement is as follows: the third guide portion has guide ribs and guide blocks arranged at intervals, the right end of the stator extends into the guide ribs and guide blocks, the guide ribs abut against the outer wall of the stator, and the guide blocks are radially spaced from the stator.

[0015] A further improvement is that the fan is housed within the first guide portion and the second guide portion.

[0016] A further improvement is as follows: the insulating component has a first insulating component located near the fan and a second insulating component located away from the fan, and the guide rib and the guide block extend beyond the end of the first insulating component near the stator.

[0017] A further improvement is as follows: the end of the motor shaft away from the fan is supported on the support wall of the first housing, and the end of the motor shaft near the fan is supported on the gearbox. The support wall has several vents, and the cooling airflow in the second housing enters the first housing through the vents.

[0018] A further improvement is as follows: an annular space is formed between the stator and the first housing, and an air gap is formed between the stator and the rotor, with the cooling airflow inside the first housing flowing in the annular space and the air gap.

[0019] A further improvement is that the annular space and the air gap are connected to the inner side of the airflow guiding element.

[0020] A further improvement is that at least a portion of the second guide portion and the third guide portion are radially opposite each other.

[0021] Compared with the prior art, the present invention has the following beneficial effects: the airflow guiding element has a first guiding part, a second guiding part and a third guiding part, the abutting ribs on the first guiding part, the second and the third guiding parts abut against the housing, and the third guiding part covers the outside of the stator, so that the airflow between the stator and the housing can completely enter the interior of the airflow guiding element through the gap between the airflow guiding element and the stator, so as to further improve the heat dissipation effect of the motor. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the power tool in the embodiment of this utility model;

[0023] Figure 2 for Figure 1 An exploded view of the power tool shown.

[0024] Figure 3 for Figure 2 A partial schematic diagram of the power tool shown;

[0025] Figure 4 for Figure 3 The diagram shows the structure of the switch assembly in the power tool.

[0026] Figure 5 for Figure 4 A schematic diagram of the switch assembly from another perspective;

[0027] Figure 6 for Figure 1 A cross-sectional view of the power tool shown;

[0028] Figure 7 for Figure 1 A schematic diagram showing the deflection of the second housing of the power tool when subjected to vibration.

[0029] Figure 8 for Figure 1 A schematic diagram showing the deflection in another direction of the second housing of the power tool when subjected to vibration;

[0030] Figure 9 for Figure 4 A schematic diagram of the deflection of the second component in the switch assembly when subjected to vibration.

[0031] Figure 10 for Figure 6 The diagram shows the airflow within the battery mounting section of the power tool.

[0032] Figure 11 for Figure 6 A cross-sectional view of the internal structure of the first housing in the power tool shown.

[0033] Figure 12 for Figure 11A three-dimensional schematic diagram of the internal structure of the first shell is shown;

[0034] Figure 13 for Figure 12 The rear view of the internal structure of the first housing shown. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0036] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," "rear," "left," and "right," which indicate orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0037] Please refer to Figures 1 to 3 This utility model relates to an electric tool 100, and more particularly to an angle grinder 100, which is mainly used for grinding metal and stone. In this embodiment, the angle grinder 100 is powered by a battery pack 1, which is inserted into the housing 2 of the angle grinder 100 at an angle or vertical position to transmit the power stored in the angle grinder 100 to the control module 3, the switch assembly 4, and the motor 5 and other related components inside the housing 2. That is, when the user turns on the switch assembly 4, the control module 3 transmits the power from the battery pack 1 to the motor 5 and controls the motor 5 to drive the end tool 6 (such as a grinding wheel or cutting disc) to rotate through the transmission assembly (bevel gear system, output shaft).

[0038] Please combine Figures 6 to 9 As shown, to illustrate the structure of the angle grinder 100, a first axis X extending along the front-to-back (axial direction of the housing 2), a second axis Y extending along the left-to-right (radial left-to-right direction), and a third axis Z extending up-down (radial up-down direction) are spatially defined. When stationary, the housing 2 of the angle grinder 100 can be sequentially divided into a gearbox 21, a first housing 22, and a second housing 23 along the first axis X from front to back. The motor 5 is housed within the cylindrical first housing 22 and has a stator 51 and a rotor 52 connected to each other. The rotor 52 has a motor shaft 53 extending along the first axis X. The motor shaft 53 rotates around a rotation axis 531, which is parallel to the first axis X.

[0039] The second housing 23 is detachably connected to the rear of the first housing 22 and is divided into a grip portion 231 and a battery mounting portion 232. The grip portion 231 is also cylindrical and can be divided into a transition area 231a at the front end and a narrow diameter portion 231b integrally formed with the transition area 231a. The diameter of the transition area 231a decreases from front to back, and the narrow diameter portion 231b is located at the rear of the transition area 231a. Its diameter is smaller than the diameter of the first housing 22 and is approximately equal to the minimum diameter of the transition area 231a. Furthermore, the central axis of the narrow diameter portion 231b should be located above the rotation axis 531 to provide a better operating experience for the user when gripping the narrow diameter portion 231b. The battery mounting part 232 is integrally formed at the rear end of the narrow diameter part 231b. Its main extension direction is set at an angle to the rotation axis 531. This angle can be 20 degrees to 70 degrees, preferably 30 degrees to 60 degrees. That is, the angle between the insertion direction of the battery pack 1 and the rotation axis 531 is preferably 30 degrees to 60 degrees.

[0040] Please continue to refer to Figures 1 to 3 and combined Figures 6 to 9 The second housing 23 is divided into two parts along the second axis Y: a first half-shell 23a and a second half-shell 23b. That is, both the first half-shell 23a and the second half-shell 23b have a grip portion 231 and a battery mounting portion 232. Further, the first housing 22 is provided with a rear end wall 220. A positioning ring 221 extends from the rear end wall 220 toward the grip portion 231. Mounting ribs 222 protrude from the left and right sides of the positioning ring 221 toward the grip portion 231. The mounting ribs 222 have a circular outline in the left-right direction; that is, the mounting ribs 222 are part of the positioning ring 221. A pair of receiving portions 222a are provided on the mounting ribs 222 in the left-right direction. Each receiving portion 222a has a receiving bottom wall 222b, a receiving hole 222c, and a receiving side wall 222d. The line connecting the midpoints of the two receiving holes 222c is perpendicular to the rotation axis 531 and intersects the rotation axis 531 to form an intersection point. The positioning ring 221 has a pair of fastener receiving parts 223 extending in the left and right direction on its upper and lower sides. These two fastener receiving parts 223 are also part of the positioning ring 221 and have through holes 223a in the left and right direction.

[0041] Within the transition zone 231a between the first half-shell 23a and the second half-shell 23b, a pair of retaining pins 231c extend towards each other in the left-right direction. The line connecting the center points of the two receiving holes 222c also passes through the center point of this pair of retaining pins 231c. The outer diameter of the retaining pins 231c must be smaller than the inner diameter of the receiving holes 222c. On the upper and lower sides of each retaining pin 231c in the first half-shell 23a and the second half-shell 23b, a pair of fastener mounting portions 224 extend toward the through hole 223a of the fastener receiving portion 223. When the first half-shell 23a and the second half-shell 23b are closed onto the first housing 22, the front end of the transition area 231a abuts against the rear end wall 220 of the first housing 22, and the inner wall of the front end of the transition area 231a abuts against the circumferential wall of the positioning ring 221. At this time, the fastener mounting parts 224 on the first half-shell 23a and the second half-shell 23b are inserted into the through holes 223a of the corresponding fastener receiving parts 223. Furthermore, a fastening channel 224a is formed inside the two fastener mounting parts 224 in each through hole 223a. Fasteners such as screws are inserted into the fastening channel 224a, thereby realizing the installation and fixation of the first half-shell 23a and the second half-shell 23b relative to the first housing 22.

[0042] When the angle grinder 100 is performing grinding operations, the user's hand will experience significant vibration, especially when the user's hand is pressing on the grip 231. Vibrations generated on the first housing 22 and gearbox 21 will be transmitted to the grip 231, causing it to twist or loosen relative to the first housing 22 due to the vibration, which is detrimental to the user's operating experience. Please refer to... Figure 2 and Figure 3 In this embodiment, a vibration damping mechanism 24 is provided between the gripping part 231 of the angle grinder 100 and the first housing 22. The vibration damping mechanism 24 includes two parts, namely a first vibration damping element 25 and a second vibration damping element 26 disposed between the transition area 231a and the first housing 22.

[0043] The first damping element 25 is a damping ring, which is disposed between the fixing pin 231c and the receiving portion 222a. Specifically, the first damping element 25 is sleeved on the outer peripheral surface of the fixing pin. When the first half-shell 23a and the second half-shell 23b are closed to the first housing 22, the fixing pin 231c drives the first damping element 25 into the receiving portion 222a. At this time, the first damping element 25 abuts against the receiving bottom wall 222b and the receiving side wall 222d, that is, it is located in the receiving space 222e formed by the receiving bottom wall 222b and the receiving side wall 222d. The first damping element 25 is in close fit with the fixing pin 231c, the receiving bottom wall 222b and the receiving side wall 222d. The fixing pin 231c extends through the receiving hole 222c and at least a portion of the fixing pin 231c protrudes from the receiving hole 222c.

[0044] The second damping element 26 is a soft rubber coating formed on the outside of the grip portion 231, extending from the rear end of the battery mounting portion 232 to the front end of the transition region 231a, and extending beyond the front end of the transition region 231a. In addition, the second damping element 26 forms an annular element at the front end of the first half-shell 23a and the second half-shell 23b. When the first half-shell 23a and the second half-shell 23b are closed to the first housing 22, the second damping element 26 abuts against the rear end wall 220 of the first housing 22 and the circumferential wall surface of the positioning ring 221. The second damping element 26 at least partially covers the first damping element 25 in the left-right direction, so that vibration is transmitted to the first damping element 25 first, and then to the second damping element 26.

[0045] Please refer to Figures 6 to 9 As shown, when the second housing 23 is subjected to vibration from the first housing 22, the second housing 23 mainly deflects around the second axis Y and the third axis Z. The deflection of the second housing 23 around the first axis X is limited by the fastener mounting part 224, the fastener receiving part 223, the fixing pin 231c and the receiving part 222a. Therefore, the deflection of the second housing 23 around the first axis X can be ignored.

[0046] Please continue to refer to Figures 6 to 9 As shown, when the second housing 23 is vibrated and deflects around the second axis Y, the deflection angle between it and the first axis X (the angle between axis A and the first axis X in the figure) does not exceed 1 degree, while it does not form a deflection angle with the third axis Z. When the second housing 23 is vibrated and rotates around the third axis Z, the deflection angle between it and the first axis X (the angle between axis B and the first axis X in the figure) does not exceed 2 degrees, and at the same time, the deflection angle between it and the second axis Y (the angle between axis C and the second axis Y in the figure) also does not exceed 2 degrees.

[0047] In fact, when the second housing 23 is vibrated, the deflection in the left-right direction is greater than the deflection in the up-down direction; that is, the vibration in the left-right direction is greater than the vibration in the up-down direction. Furthermore, the vibration experienced by the second housing 23 in the front-back direction is smaller than that in the up-down and left-right directions. This is because the contact area between the first damping element 25 and the second damping element 26 and the first housing 22 when the second housing 23 is subjected to front-back vibration is greater than the contact area when the second housing 23 is subjected to left-back and up-down vibration. In other words, the radial vibration experienced by the second housing 23 is greater than the axial vibration. By observing the deflection of the second housing 23 in different directions when it is vibrated, it can be found that the deflection remains at a relatively small angle. Therefore, the first damping element 25 and the second damping element 26 have a superior effect on vibration reduction.

[0048] When the angle grinder 100 is in operation, not only will the housing 2 be subjected to vibration, but the vibration will also be transmitted through the housing 2 to the internal components, especially the switching assembly 4. Please refer to... Figures 2 to 6 The switch assembly 4 includes an operating component 41 disposed on the outer surface of the first housing 22, a trigger switch 42 housed in the second housing 23, particularly the grip portion 231, and an intermediate component 43 connecting the operating component 41 and the trigger switch 42. In this embodiment, the operating component 41 is a push button, the intermediate component 43 is a sliding link, and the trigger switch 42 is a signal switch. The push button 41 is disposed in a mounting groove 411 on the upper side of the first housing 22 and is connected to the sliding link 43 via a hook portion 412. When the user pushes the push button 41 forward, the sliding link 43 is simultaneously actuated forward to press down the roller 421 on the signal switch 42 via the pushing portion 431. At the same time, the roller 421 drives the connected spring 423 to press down synchronously, thereby indirectly pressing down the trigger button 422 of the signal switch 42, ultimately turning on the signal switch 42.

[0049] The sliding link 43 includes a first component 432 and a second component 433 connected to each other. Both the first component 432 and the second component 433 are long rods. The first component 432 extends from inside the first housing 22 into the transition area 231a. The hook 412 on the push button 422 is connected to the hook receiving hole 432a at the front end of the first component 432. Since the motor 5 is housed inside the first housing 22, the space left for the first component 432 is not very sufficient. Therefore, the first housing 22 has a component receiving opening 434 facing forward at the upper end of the rear end wall 220, and a component channel 435 is machined at the top of the fastener receiving part 223 located on the upper side, so that the bottom end of the component receiving opening 434 is flush with the surface of the component channel 435. In other words, the component channel 435 extends into the component receiving opening 434, so that the first component 432 passes through the component receiving opening 434 from inside the first housing 22 and extends through the component channel 435 to reach the transition area 231a. It should be noted that the width of the component receiving opening 434 in the left and right direction should not be greater than the width of the fastener receiving part 223 in the left and right direction. In other words, the fastener receiving part 223 should reserve a certain component blocking part 436 on the left and right sides of the component channel 435 so that the first component 432 can be restricted by the component blocking part 436 when sliding, so as to further reduce the vibration of the first component 432.

[0050] The second component 433 is connected to the rear end of the first component 432, extending rearward from the transition region 231a to the narrow diameter portion 231b. Regarding the boundary between the transition region 231a and the narrow diameter portion 231b, the transition region 231a is a region with a significant diameter change. From the perspective of component spatial arrangement, the transition region 231a is the area on the second housing 23 located at the front end of the signal switch 42, while the narrow diameter portion 231b is the area extending rearward from the very front end of the signal switch 42, where the diameter does not change significantly. Please continue reading. Figures 2 to 6 The second component 433 is pivotable relative to the first component 432. Specifically, the first component 432 has a long rod-shaped first component body 432b and a pivoting protrusion 432c located at the rear end of the first component body 432b and extending downward. The second component 433 has a long rod-shaped second component body 433a and a pivoting receiving portion 433b located at the front end of the second component body 433a. The pivoting protrusion 432c is inserted into the pivoting receiving portion 433b, thereby allowing the second component body 433a to pivot around the pivoting protrusion 432c. Further, the end of the second component body 433a near the pivoting receiving portion 433b is arc-shaped. The second component body 433a and the pivoting receiving portion 433b form a receiving area, and the pivoting protrusion 432c and the ends of the first component body 432b near the second component body 433a are received in the receiving area.

[0051] The pivot receiving part 433b includes an annular receiving base 433c and a receiving through hole 433d penetrating the receiving base 433c. The pivot protrusion 432c includes a protrusion 432d and a limiting part 432e. The protrusion 432d passes through the receiving through hole 433d, and the limiting part 432e abuts against the lower end face of the receiving base 433c. Furthermore, the outer diameter of the limiting part 432e should be larger than the outer diameter of the protrusion 432d. In order to successfully install the protrusion 432d and the limiting part 432e into the receiving through hole 433d, a component opening 432f is provided at the rear end of the first component body 432b. The component opening 432f extends downward from the upper surface of the first component body 432b to the protrusion 432d and the limiting part 432e. The component opening 432f can penetrate the protrusion 432d and the limiting part 432e in the front-back direction, or it can partially penetrate the protrusion 432d and the limiting part 432e. In this way, when inserting the pivot protrusion 432c into the receiving through hole 433d, the user can first press the pivot protrusion 432c radially inward to reduce its overall diameter. Then, the limiting part 432e is pushed out of the receiving through hole 433d. Finally, the pressure on the pivot protrusion 432c is released, allowing it to return to its original position, thereby placing the limiting part 432e against the lower end face of the receiving base 433c, thus achieving installation. It should be noted that the receiving through hole 433d and the protrusion 432d are in a clearance fit to ensure that the second component 433 can pivot relative to the first component 432.

[0052] The installation of the second component 433 will be described next. Please refer to [link / reference]. Figures 2 to 6 The second housing 23 has a guide rail portion 433e on the inner wall of the narrow diameter portion 231b. The guide rail portion 433e has a first guide rail portion 433f and a second guide rail portion 433g extending along the first axis X direction. The second guide rail portion 433g is located in front of the first guide rail portion 433f and is further away from the signal switch 42 than the first guide rail portion 433f in the third axis Z direction. The second component 433 has a pre-tightening portion 433i located at the rear end of the pressing portion 431. An elastic member 433j is mounted on the pre-tightening portion 433i, and the pre-tightening portion 433i is at least partially located inside the first guide rail portion 433f. The elastic element 433j is completely disposed within the first guide rail portion 433f. The front end of the elastic element 433j abuts against the guide rail separator 433k between the first guide rail portion 433f and the second guide rail portion 433g. The rear end of the pre-tightening portion 433i is provided with a pre-tightening limiting portion 433n, and the rear end of the elastic element 433j abuts against the pre-tightening limiting portion 433n. When the push button 41 drives the sliding connecting rod 43 to slide forward, the pushing portion 431 slides within the second guide rail portion 433g, the pre-tightening portion 433i slides within the first guide rail portion 433f, and the elastic element 433j is compressed within the first guide rail portion 433f.

[0053] When the housing 2 of the angle grinder 100, especially the second housing 23, is subjected to vibration, the vibration is transmitted to the switch assembly 4 through the housing 2. The vibration of the switch assembly 4 is mainly distributed in the signal switch 42, because the signal switch 42 is mainly limited by the ribs on the inner wall of the housing 2 when it is assembled to the housing 2. Furthermore, in this embodiment, when the motor 5 is turned on, when the signal switch 42 is subjected to vibration, it will generate a certain displacement in the direction of the second axis Y. Since the roller 421 abuts against the second component 433 of the sliding link 43 at this time, the roller 421 will drive the second component 433 to deflect slightly.

[0054] Combination Figure 9 The angle between the deflection axis S of the second component 433 and the first axis X relative to the first component 432 does not exceed 2 degrees. The second component 433 is pivoted by the signal switch 42, which reduces wear caused by the interaction between the signal switch 42, especially the roller 421, and the movement of the second component 433 when subjected to vibration. In other words, if the second component 433 could not deflect, the friction between the signal switch 42 and the second component 433 due to vibration would be relatively large, leading to significant wear on the signal switch 42. Therefore, in this embodiment, the roller 421 reduces its own frictional damage by synchronously driving the second component 433, ensuring service life and efficiency. Furthermore, the deflection angle of the second component 433 is designed to not exceed 2 degrees, thus avoiding an increase in the overall size of the second housing 23, especially the grip portion 231, promoting a compact grip portion 231 and conforming to ergonomic design.

[0055] The pivoting of the second component 433 relative to the first component 432 is not random. The pivoting of the second component 433 can only occur within the extension plane P of the sliding link 43. That is, the extension plane P must pass through both the first component 432 and the second component 433 simultaneously. Setting the first component 432 and the second component 433 in the same plane can also achieve the compactness of the sliding link 43 in the thickness direction. In addition, the extension plane P can be set parallel to the rotation axis 531 or it can be set at an angle to intersect the rotation axis 531. In this embodiment, the extension plane P is set parallel to the rotation axis 531 to improve the user's operability.

[0056] Besides vibration reduction, heat dissipation is another issue that the angle grinder 100 needs to address, especially the heat dissipation of the control module and motor. Please refer to... Figures 2 to 3 and combined Figure 6 and Figure 10The battery mounting section 232 has a pair of air inlets 233 on its front and rear sides. A control module support structure 31 is provided on the outside of each air inlet 233, and the control module 3 is installed in the control module support structure 31. In this embodiment, the control module 3 includes a control module housing 32, a control circuit board (not shown) housed in the control module housing 32, and a motor switch (not shown) connected to the control circuit board. The control circuit board is connected to the battery pack 1 through a connector 33 to receive current from the battery pack 1 and to control the start and stop of the motor 5 through the motor switch. The control circuit board is connected to the motor through a motor wire 34.

[0057] During the operation of control module 3, the control circuit board and motor switch generate a large amount of heat. This heat is usually transferred to the heat sink (not shown) connected to the control circuit board and motor switch, and carried away by the cooling airflow flowing in from the air inlet 233. However, the electronic components such as the motor switch are located on the side of the control module housing 32 facing the motor 5, which is in the path of the cooling airflow and therefore receives sufficient cooling. On the other hand, the side of the control module housing 32 away from the motor 5 receives almost no direct cooling airflow and therefore cannot be effectively cooled.

[0058] To solve the above problems, this embodiment provides a flow guiding mechanism 27 on the side of the control module housing 32 away from the motor 5. To explain the operating principle of the flow guiding mechanism 27 in detail, the following definitions are made: The bottom surface of the control module housing 32 away from the motor 5 and abutting against the flow guiding mechanism 27 is positioned as the first wall surface 321. The four walls perpendicularly connected to the first wall surface 321 are defined as the second wall surface 322. At least two of the second wall surfaces 322 are directly opposite the air inlet 233. Furthermore, the width of the second wall surface 322 is smaller than the width of the air inlet 233. That is, the projection width of the second wall surface 322 in the third axis Z direction is smaller than that of the air inlet 233, thereby ensuring that the cooling airflow has sufficient flow on the second wall surface 322.

[0059] A partition wall 28 is provided within the battery mounting section 232, dividing the space within the battery mounting section 232 into a first space 281 closer to the motor 5 and a second space 282 farther from the motor 5 along the first axis X. The connector 33 is located within the second space 282. In this embodiment, the control module housing 32 is inclined relative to the rotation axis 531 to accommodate the inclined insertion of the battery pack 1. That is, the inclination direction of the control module housing 32 is parallel to the inclination direction of the battery pack 1, and the angle with the rotation axis 531 is preferably 30 to 60 degrees. Furthermore, to facilitate the installation of the flow guiding mechanism 27, the inclination direction of the partition wall 28 is also parallel to the inclination direction of the control module housing 32. Please refer to... Figure 10The airflow guiding mechanism 27 is located in the second space 282 and is divided into a first airflow guiding member 271 located on the upper side and a second airflow guiding member 272 located on the lower side. Both the first airflow guiding member 271 and the second airflow guiding member 272 extend from one air inlet 233 to another air inlet 233 along the second axis Y direction. In addition, both the first airflow guiding member 271 and the second airflow guiding member 272 extend into the air inlet 233 in a direction perpendicular to the partition wall 28. This is because the first wall surface 321 of the power housing 32 is completely housed inside the air inlet 233 in a direction perpendicular to the partition wall 28. The extension of the first airflow guiding member 271 and the second airflow guiding member 272 into the air inlet 233 can not only cool the first wall surface 322, but also provide a certain support for the control module housing 32.

[0060] Please continue to refer to Figure 10 The first guide member 271 is a continuous long plate extending from one side air inlet 233 of the battery mounting part 232 to the other side air inlet 233 without any breaks in the middle. A first gas channel 271a for cooling gas flow is formed above it. The second guide member 272 is arranged in multiple rows from top to bottom, all of which are discontinuous plate structures. In addition, the second guide member 272 can be divided into multiple rows of first guide plates 272a located at one side air inlet 233 and multiple rows of second guide plates 272b located at the other side air inlet 233. A gas flow section 272c is formed between the first guide plates 272a and the second guide plates 272b in the same row. In this way, the multiple rows of first guide plates 272a, multiple rows of second guide plates 272b and gas flow section 272c form a second gas channel 272d. The second gas channel 272d and the first gas channel 271a are separated by the first guide member 271.

[0061] Furthermore, the first airflow F1, guided by the first guide element 271, enters the first space 281 from the air inlets 233 on both sides and flows through the first gas channel 271a, ultimately flowing to the second wall surface 322 on the upper side of the control module housing 32. The second airflow F2, guided by the second guide element 272, enters the first space 281 from the air inlets 233 on both sides and flows through the second gas channel 272d, ultimately flowing to the second wall surface 322 on the lower side of the control module housing 32. At least a portion of the first airflow F1 flows in the opposite direction to at least a portion of the second airflow F2. Through the flow of the first airflow F1 and the second airflow F2, the first wall surface 321 and the second wall surface 322 of the control module housing 32 can be sufficiently cooled.

[0062] Please refer to Figure 6 , Figures 11 to 13After the first airflow F1 and the second airflow F2 leave the first wall 321 and the second wall 322, they will flow through the electronic components together with other airflows entering from the air inlet 233, thereby achieving comprehensive heat dissipation of the control module 3. Subsequently, the first airflow F1, the second airflow F2 and the remaining airflows will converge in the narrow diameter portion 231b to form a third airflow F3, which will further dissipate heat from the signal switch 42, the motor 5 and the bevel gear system in the gearbox 21. Among these three, the motor 5 generates the most heat. In this embodiment, the front and rear ends of the motor shaft 53 are supported by bearings in the gearbox 21 and the support wall 225, respectively. The support wall 225 is located at the rear end of the first housing 22 and inside the positioning ring 221. At least a portion of the support wall 225 is located in the transition zone 231a, which allows for compact housing in the first axis X direction. A vent 225a is formed between the support wall 225 and the first housing 22, and the third airflow F3 enters the first housing 22 from the second housing 23 through the vent 225a.

[0063] A fan 54 is also provided at the front end of the motor shaft 53. The first airflow F1, the second airflow F2, and the third airflow F3 are all generated by the rotation of the fan 54. In this embodiment, the motor 5 is a brushless motor. Therefore, most of the heat of the motor 5 is generated by the energization of the coils inside the stator 51. Therefore, an airflow guiding element 55 is provided on the outside of the fan 54.

[0064] Please continue to refer to Figure 6 , Figures 11 to 13 The airflow guiding element 55 includes a cylindrical, horizontally extending first guiding portion 551, a second guiding portion 552 extending obliquely from the first guiding portion 551, and a third guiding portion 553 extending horizontally from the second guiding portion 552. The first guiding portion 551 is fitted to the inner wall of the front end of the first housing 22, and its inner diameter must be larger than the outer diameter of the fan 54. The second guiding portion 552 extends from the left end wall of the first guiding portion 551 toward the lower left side, and the included angle between the two is preferably 110 degrees to 150 degrees. Furthermore, the stator 51 has insulating members at both ends that house the internal coils, namely a first insulating member 511 located on the right and a second insulating member 512 located on the left. The left end of the second guiding portion 552 is spaced apart from the first insulating member 511. The first guiding portion 551 and the second guiding portion 552 house the fan 54 in the direction of the first axis X.

[0065] The third guide portion 553 extends to the left from the outer surface of the second guide portion 552, parallel to the extending direction of the first guide portion 551. The third guide portion 553 radially houses the first insulating member 511 and the stator 51, with the right end of the stator 51 extending into the third guide portion 553. The third guide portion 553 is not a continuous cylindrical shape circumferentially, but is formed by several guide blocks 553a and guide ribs 553b spaced apart. Specifically, the right end of the stator 51 extends into the guide blocks 553a and guide ribs 553b; that is, both guide blocks 553a and guide ribs 553b extend to the left side of the first insulating member 511. Furthermore, there is a certain gap between the guide blocks 553a and the outer wall of the stator 51 radially, and the guide ribs 553b abut against the outer wall of the stator 51 radially. In this way, when the third airflow F3 flows into the first housing 22, it will be divided into the fourth airflow F4 and the fifth airflow F5. The fourth airflow F4 flows in the air gap 56 between the rotor 52 and the stator 51, and the fifth airflow F5 flows in the annular space 29 between the stator 51 and the first housing 22.

[0066] In addition, abutment ribs 554 extend from the outer surfaces of the second guide portion 552 to the third guide portion 553. When the airflow guiding element 55 is installed, the abutment ribs 554 abut against the inner wall of the first housing 22, and the guide ribs 553b abut against the outer wall of the stator 51. Combined with the abutment between the first guide portion 551 and the inner wall of the first housing 22, the airflow guiding element 55 can be stably installed. Moreover, since the guide ribs 553b completely block the space between the airflow guiding element 55 and the first housing 22, the fifth airflow F5 will no longer flow from the outside of the airflow guiding element 55. Instead, it will enter the interior of the fan guiding element 55 through the gap between the guide block 553a and the stator 51 to dissipate heat from the front end area of ​​the stator 51 and the rotor 52. Finally, it flows out from the air outlet 21a at the front end of the gearbox 21 along with the fourth airflow F4. At least a portion of the second guide portion 552 and the third guide portion 553 are radially opposite each other, or in other words, the second guide portion 552 extends to the lower side of the third guide portion 553 to form a corner, so that the higher temperature gases such as the fourth airflow F4 and the fifth airflow F5 can flow smoothly along the corner to the air outlet 21a when they flow inside the airflow guide element 55, so as to control the temperature inside the angle grinder 100 to a relatively stable value as much as possible.

[0067] This utility model is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many other alternative solutions exist for the power tool of this utility model without departing from the principles and scope of this utility model. The scope of protection of this utility model is determined by the claims.

Claims

1. An electric tool, comprising: A housing having an air inlet and an air outlet that are interconnected; An electric motor, housed within the housing, having a stator and a rotor connected to each other, the rotor having a motor shaft and a fan mounted on the motor shaft; A control module is disposed within the housing and configured to control the on / off state of the motor. The fan draws in cooling airflow from the air inlet, flows through the control module and the motor, and exits from the air outlet. Its characteristic is that it further includes: An airflow guiding element, comprising a first guiding portion, a second guiding portion, and a third guiding portion, wherein the first guiding portion abuts against the housing, and the second guiding portion is connected between the first guiding portion and the third guiding portion; The second guide portion and the third guide portion are provided with abutting ribs that abut against the housing, and the third guide portion at least partially covers the outside of the stator.

2. The power tool of claim 1, wherein The housing consists of a gearbox, a first housing, and a second housing arranged sequentially along the axial direction. The motor is housed in the first housing, the control module is housed in the second housing, the air inlet is located in the second housing, and the air outlet is located in the gearbox.

3. The power tool of claim 2, wherein The first guide portion and the abutting rib abut against the first housing. The second guide portion extends at an angle from the surface of the first guide portion toward the motor. The included angle between the second guide portion and the first guide portion is 110 degrees to 150 degrees. The stator has an insulating member disposed at the end. The second guide portion is axially spaced from the insulating member.

4. The power tool of claim 3, wherein The third guide portion has guide ribs and guide blocks spaced apart from each other. The right end of the stator extends into the guide ribs and guide blocks. The guide ribs abut against the outer wall of the stator. The guide blocks are radially spaced from the stator.

5. The power tool of claim 4, wherein The fan is housed in the first guide section and the second guide section.

6. The power tool of claim 5, wherein The insulating component has a first insulating component located near the fan and a second insulating component located away from the fan, and the guide rib and the guide block extend beyond the end of the first insulating component near the stator.

7. The power tool of claim 4, wherein The end of the motor shaft away from the fan is supported on the support wall of the first housing, and the end of the motor shaft near the fan is supported on the gearbox. The support wall has several vents, and the cooling airflow in the second housing enters the first housing through the vents.

8. The power tool of claim 7, wherein An annular space is formed between the stator and the first housing, and an air gap is formed between the stator and the rotor. Cooling airflow in the first housing flows in the annular space and the air gap.

9. The power tool of claim 8, wherein The annular space and the air gap are connected to the inner side of the airflow guiding element.

10. The power tool of claim 3, wherein At least a portion of the second guide portion and the third guide portion are radially opposite each other.

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