power tools

Abstract

This invention discloses a power tool, comprising: a housing; a power assembly disposed within the housing for providing a power source, the power assembly including a motor, the motor including a motor shaft rotatable about a first rotation axis; an output assembly connected to the power assembly for outputting power; the power assembly further comprising: a cooling fan for generating cooling airflow, the cooling fan being configured to be driven to rotate by the motor; the power assembly further comprising: a cover plate fixedly connected to the cooling fan, the cover plate including a central hole allowing the motor shaft and cooling airflow to pass through; and a flow-guiding assembly at least partially disposed on the outer periphery of the cover plate; the flow-guiding assembly being configured to restrict the movement of cooling airflow around the outer periphery of the cover plate. This power tool exhibits good heat dissipation.

Description

Technical Field

[0001] This invention specifically relates to an electric tool. Background Technology

[0002] A reciprocating saw is an electric tool that uses a reciprocating saw blade to cut materials. It is commonly used for sawing metal sheets, pipes, profiles, or cutting bevels on steel pipes. Currently, reciprocating saws on the market typically use a transmission mechanism to convert the motor's torque into the linear reciprocating motion of the saw blade to achieve cutting. The motor inevitably generates a lot of heat when it rotates, so effective heat dissipation from the motor has always been a goal pursued by those skilled in the art. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a power tool with better heat dissipation.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: an electric tool, comprising: a housing; a power assembly disposed within the housing for providing a power source, the power assembly including a motor, the motor including a motor shaft rotatable about a first rotation axis; an output assembly connected to the power assembly for outputting power; the power assembly further comprising: a cooling fan for generating cooling airflow, the cooling fan being configured to be driven to rotate by the motor; the power assembly further comprising: a cover plate fixedly connected to the cooling fan, the cover plate including a central hole allowing the motor shaft and cooling airflow to pass through; a flow-guiding assembly at least partially disposed on the outer periphery of the cover plate; the flow-guiding assembly being configured to restrict the movement of cooling airflow around the outer periphery of the cover plate.

[0005] Furthermore, the cover plate is rotatable relative to the drainage assembly, which has an opening through which the motor can pass.

[0006] Furthermore, the inner wall of the drainage component has an inner diameter A1 in the direction perpendicular to the first rotation axis; the outer periphery of the cover plate has an outer diameter B1 in the direction perpendicular to the first rotation axis; wherein the ratio of A1 to B1 is greater than or equal to 0.8 and less than or equal to 1.2.

[0007] Furthermore, the drainage assembly is disposed around the cover plate, and the drainage assembly includes a ring that at least radially overlaps with the outer periphery of the cover plate.

[0008] Furthermore, the cover plate includes a rearwardly extending extension; the inner wall of the ring has an inner diameter A2 in a direction perpendicular to the first rotation axis; the extension has an outer diameter B2 in a direction perpendicular to the first rotation axis; wherein the ratio of A2 to B2 is greater than or equal to 1.02 and less than or equal to 1.2.

[0009] Furthermore, the cooling fan is provided with a positioning post extending rearward along the first axis; a limiting hole suitable for insertion of the positioning post is formed on the cover plate.

[0010] Furthermore, the airflow guiding assembly also includes multiple stop portions disposed on the ring, each stop portion including multiple spaced-apart stop ribs located on the outer periphery of the cooling fan.

[0011] Furthermore, the stop ribs at least partially overlap with the cooling fan blades along the first rotation axis.

[0012] Furthermore, the stop section is configured to correspond with the air outlet on the casing.

[0013] Furthermore, the transmission assembly includes a first transmission member capable of being driven by the motor shaft to rotate about a first axis, the first transmission member including a cam surface; the power tool further includes: a oscillating assembly disposed between the transmission assembly and the reciprocating assembly, the oscillating assembly including: a floating support member connected to the reciprocating assembly and capable of being driven by the cam surface to reciprocate in a vertical direction; a balance block, at least partially disposed between the transmission assembly and the reciprocating assembly and used to balance the reciprocating assembly; the balance block including: a clearance opening configured to allow the floating support member to be driven by the cam surface to reciprocate in a vertical direction.

[0014] The advantages of this invention are: by setting a cooperating airflow guide component and a cover plate at the cooling fan, the cooling airflow of the cooling fan is prevented from moving around the outer periphery of the cover plate, thereby effectively planning the flow path of the cooling airflow and improving cooling efficiency. Attached Figure Description

[0015] Figure 1 This is a perspective view of the reciprocating saw in an embodiment of the present invention;

[0016] Figure 2 yes Figure 1 A plan view of the reciprocating saw shown;

[0017] Figure 3 yes Figure 1 A plan view of part of the structure in the reciprocating saw shown;

[0018] Figure 4 yes Figure 1 A plan view of part of the structure in the reciprocating saw shown;

[0019] Figure 5 yes Figure 4 A cross-sectional view of a portion of the reciprocating saw along the AA direction.

[0020] Figure 6 yes Figure 1 A plan view of part of the structure of the lifting blade assembly in the reciprocating saw when it is in the supported position;

[0021] Figure 7 yes Figure 1 A three-dimensional view of the partial structure shown;

[0022] Figure 8 yes Figure 1 A plan view of a portion of the structure of the lifting blade assembly in the reciprocating saw when it is in the released position;

[0023] Figure 9 yes Figure 7 A three-dimensional view of the partial structure shown;

[0024] Figure 10 yes Figure 1 A top view of part of the structure in the reciprocating saw shown;

[0025] Figure 11 yes Figure 1 An exploded view of part of the structure in the reciprocating saw shown;

[0026] Figure 12 yes Figure 1 A top view of the counterweight in the reciprocating saw shown;

[0027] Figure 13 yes Figure 1 A plan view of part of the structure in the reciprocating saw shown;

[0028] Figure 14 yes Figure 11 A cross-sectional view of a portion of the structure in the reciprocating saw shown;

[0029] Figure 15 yes Figure 1 An exploded view of part of the structure in the reciprocating saw shown;

[0030] Figure 16 yes Figure 15 Another perspective of the exploded view of part of the reciprocating saw shown;

[0031] Figure 17 yes Figure 1 A plan view of the flow guide component in the reciprocating saw shown;

[0032] Figure 18 yes Figure 1 A three-dimensional view of the flow guide component in the reciprocating saw shown;

[0033] Figure 19 This is a plan view of another embodiment of the power component in this invention;

[0034] Figure 20 yes Figure 19 A cross-sectional view of the middle structure along the AA direction. Detailed Implementation

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

[0036] To clearly illustrate the technical solution of this application, the following definitions are provided: Figure 1 The directions shown are up, down, front, back, left, and right.

[0037] like Figure 1 As shown, this is a cutting tool of the present invention, specifically an electric cutting tool. In the embodiments of this application, a reciprocating saw 100 is used as an example for detailed description.

[0038] like Figures 1 to 5 The reciprocating saw 100 shown includes: a housing 10, a power assembly 20, a reciprocating assembly 31, a transmission assembly 32, a shock absorption assembly 33, a swing assembly 34, an energy device 40, and a cutting attachment. The power assembly 20 is disposed within the housing 10 and provides power to the reciprocating saw 100. The power assembly 20 includes a motor 21, which includes a motor shaft 211 rotatable about a first rotation axis 101 and a stator 212 for generating a magnetic field. The energy device 40 is mounted on the housing 10 and provides an energy source. In this embodiment, the energy device 40 is specifically a battery pack 41. However, the battery pack 41 can be separated from the housing 10, meaning it is not directly mounted on the surface of the housing 10. The housing 10 is fixedly connected or integrally formed with a first gripping part 11, a second gripping part 12, and a connecting part 13 connecting the first gripping part 11 and the second gripping part 12 for the user to grip. In the front-rear direction, the first gripping part 11 is disposed adjacent to the cutting attachment, and the second gripping part 12 is disposed on the rear side of the reciprocating saw 100, and the second gripping part 12 is a handle. The transmission assembly 32 is disposed in the connecting area and is used to convert the rotational motion output by the motor shaft 211 into the reciprocating motion of the reciprocating assembly 31. One end of the reciprocating assembly 31 is connected to the transmission assembly 32, and the other end is used to connect to the cutting attachment. In this embodiment, the cutting attachment is specifically a saw blade 50. During the operation of the reciprocating saw 100, the shock-absorbing assembly 33 moves in a direction substantially opposite to that of the reciprocating assembly 31 to balance the reciprocating motion of the reciprocating assembly 31. The shock-absorbing assembly 33 includes a balance block 331. The oscillating component 34 is disposed adjacent to the reciprocating component 31 and can provide the reciprocating component 31 with a support force that is different from the direction of movement of the reciprocating component 31, thereby enabling the reciprocating component 31 to rotate about the second axis 104. In this embodiment, the transmission component 32, the shock absorption component 33 and the oscillating component 34 are all disposed within the receiving cavity of the gearbox 14.

[0039] Please refer to Figures 4 to 7Specifically, the reciprocating assembly 31 includes a reciprocating motion component 311, which is arranged approximately along its own axis. When driven by the motor shaft 211, the reciprocating motion component 311 can reciprocate relative to the housing 10 along its own axis. An output unit may be provided at the end of the reciprocating motion component 311 for connecting the saw blade 50. The transmission assembly 32 includes a first transmission component 321 that can be driven by the motor 21 to rotate around the first axis 102, a rotating component 322 that is fixedly connected to the first transmission component 321 on its upper side, and an eccentric component 323 that is connected to the rotating component 322 and can be driven by the rotating component 322 to rotate. The eccentric component 323 cooperates with the guide groove 316 of the reciprocating motion component and can slide within the guide groove 316. The length of the eccentric component 323 in the front-rear direction is substantially the same as the width of the inner wall of the guide groove 316 in the front-rear direction. That is, the eccentric component 323 is driven to rotate, thereby realizing the reciprocating motion of the reciprocating motion component 311. Furthermore, the surface of the eccentric member 323 is spherical. This design allows the third transmission member 323 to better engage with the guide groove of the reciprocating motion member 311 during rotation. The swing assembly 34 includes a floating support member 341 positioned between the first transmission member 321 and the reciprocating motion member 311. The floating support member 341 facilitates the transmission connection between the reciprocating motion member 311 and the first transmission member 321. The first transmission member 321 includes a cam surface 3211. The floating support member 341 enables the cam surface 3211 to transmit power to the reciprocating motion member 311. In other words, the cam surface 3211 can drive the floating support member 341 to float in the vertical direction. That is, the cam surface 3211 can drive the reciprocating motion member 311 to rotate back and forth along the second axis 104. It should be noted that floating motion refers to the reciprocating motion of the floating support 341 driven by the cam surface 3211 in the vertical direction. That is, when the cam surface 3211 applies a supporting force to the floating support 341, the floating support 341 rotates along its own axis while also moving back and forth in the vertical direction. In addition, floating motion can also be interpreted as the reciprocating motion of the floating support 341 driven by the cam surface 3211 in a direction that intersects the first axis 101 at an inclination.

[0040] In the vertical direction, the balance block 331 is positioned between the reciprocating motion component 311 and the first transmission component 321. The balance block 331 has a clearance opening 3311 that allows the floating support component 341 to extend into it. This means that the projections of the balance block 331 and the floating support component 341 on the plane containing the first axis 102 at least partially overlap. This allows the dimensions of the connecting part 13 of the reciprocating saw 100 in the vertical direction to be more reasonable. By using the cam surface 3211 of the first transmission component 321 as the lifting slope to cooperate with the floating support component 341 to achieve the lifting structure, this arrangement can make full use of the upper space of the first transmission component 321, making the overall structure of the machine more compact and reducing the dimensions of the floating support component 341 in the vertical direction. Moreover, while ensuring that the dimensions of the reciprocating saw 100 in the vertical direction are reduced, the dimensions of the reciprocating saw 100 in the front-back direction are also avoided. Furthermore, this design avoids the need for additional components to drive the reciprocating motion component 311 and the balance block 331 when using other methods to achieve tool lifting, which would result in an overly complex structure. In other words, the above design greatly simplifies the structure. It should be noted that in this application, the first axis 102 extends substantially in the vertical direction.

[0041] Please refer to Figures 6 to 9The oscillating assembly 34 is located above the first transmission member 321 and is connected to the reciprocating assembly 31. The reciprocating assembly 31 includes a sleeve 312 fixed to the moving part of the reciprocating saw 100. The oscillating assembly 34 is connected to the sleeve 312, and the floating support member 341 is movable between a supported position and a released position. Specifically, when the floating support member 341 is in the released position, the cam surface 3211 is separated from the floating support member 341. Here, separation means that the cam surface 3211 and the floating support member 341 are not in contact, or it can mean that there is contact between the cam surface 3211 and the floating support member 341, but there is no supporting force. When the floating support member 341 is in the supported position, the cam surface 3211 is in contact with the floating support member 341. It should be noted that when the floating support 341 is in the supported position, the lifting amount of the reciprocating saw 100 is at its maximum. This means that the first transmission component 321 is always in contact with the floating support 341 during rotation. When the floating support 341 is in the released position, the reciprocating motion component 311 is only driven by the slider during movement. At this time, there is no supporting force between the first transmission component 321 and the floating support 341 during rotation. The swing assembly 34 also includes an operating handle 342 and a lifting bracket 343. The operating handle 342 is used to move the floating support 341 between the supported and released positions. The operating handle 342 is specifically mounted on the gearbox 14. The floating support 341 is rotatably connected to the lifting bracket 343. When the lifting bracket 343 moves, the floating support 341 moves accordingly. The lifting bracket 343 is fixedly connected to the reciprocating motion component 311. The operating handle 342 extends along the first straight line 103 and is rotatable around the position of the first straight line 103. During rotation, the operating handle 342 drives the sleeve 312 on the reciprocating motion member 311, thereby moving the floating support member 341 between the supported position and the released position. In this embodiment, the operating handle 342 is specifically a cylinder, and it is provided with a grooved surface 3421 and an arc surface 3422. When the floating support member 341 is in the supported position, the grooved surface 3421 contacts the sleeve 312; when the floating support member 341 is in the released position, the arc surface 3422 contacts the sleeve 312. For ease of explanation, the support position is defined here as the initial position of the floating support 341. Specifically, when the operating handle 342 rotates from the initial position around the first straight line 103 along the first direction T, the operating handle 342 drives the sleeve to move upward, thereby causing the lifting support 343 to move away from the cam surface 3211; when the operating handle 342 rotates from the first straight line 103 along the second direction F to the release position, the operating handle 342 drives the sleeve to move downward, thereby causing the support to move closer to the cam surface 3211.Therefore, it can be seen that the operating handle 342 has multiple maintainable intermediate positions during rotation. When the floating support 341 is in a certain intermediate position, during the rotation of the first transmission member 321, there is a situation where the cam surface 3211 partially contacts the floating support 341. That is, when the first transmission member 321 rotates, only a portion of the cam surface 3211 can provide support for the floating support 341. The larger the angle of rotation of the operating handle 342 along the first direction T, the smaller the area that generates driving force on the floating support 341, i.e., the smaller the lifting amount, and vice versa. As one embodiment, the cam surface 3211 is the upper surface of the first transmission member 321. Specifically, the cam surface 3211 is an inclined surface with a height difference, thereby realizing the lifting of the tool, and thus causing the floating support 341 to reciprocate basically along the first axis 101. In another embodiment, a protrusion is fixedly connected to or integrally formed on the upper surface of the first transmission member, and the cam surface is the surface of the protrusion. The protrusion is irregular in shape, that is, the projection of the protrusion on the plane perpendicular to the first axis is irregular. In this case, the floating support member adapted to the cam surface can be arranged in a direction that is inclined to intersect the first axis, thereby realizing the lifting of the blade, and then causing the floating support member to reciprocate in the direction that is inclined to intersect the first axis. This arrangement makes the structure more compact.

[0042] In the front-to-back direction, the swing assembly 34 is positioned between the eccentric member and the handle, meaning the swing assembly 34 is located at the rear end of the reciprocating assembly 31. Specifically, the blade lifting bracket 343 is fixedly mounted on the sleeve 312 at the rear end of the reciprocating motion member 311, and the floating support member 341 is positioned adjacent to the rear end of the reciprocating motion member 311. This arrangement avoids the situation where, if the swing assembly 34 is positioned in front of the eccentric member, the opening of the clearance slot 3311 on the balance block 331, allowing the floating support member 341 to extend, would be too large. This would result in insufficient structural strength of the balance block 331, potentially causing damage to the balance block 331 due to vibration during operation of the reciprocating saw 100, thus affecting machine use. Of course, the blade lifting bracket 343 can also be mounted on other components at the rear end of the reciprocating assembly 31, as long as blade lifting is achieved; its specific installation location is not limited. Furthermore, the clearance opening 3311 has a width W1 in the left-right direction perpendicular to the up-down direction, and the floating support 341 has a diameter W2 in the left-right direction perpendicular to the up-down direction, wherein W1 is greater than W2, that is, the clearance opening 3311 has sufficient width to allow the floating support 341 to move.

[0043] Please refer to Figures 2 to 3The reciprocating saw 100 also includes a support assembly 60, which is at least partially disposed within the housing 10. The support assembly 60 includes a support 61, which is mounted on the housing 10. The housing 10 has at least one mounting position for mounting the support 61. It should be noted that when the support 61 is fixedly connected to the housing 10, the mounting position refers to the position where the support 61 is fixedly connected to the housing 10; when the support 61 is slidably connected to the housing 10, the mounting position refers to the position of the adjusting component used to adjust the distance by which the support 61 extends out of the housing 10. In this embodiment, the support base 61 is slidably connected to the housing 10. An adjustment button is used to adjust the position of the support base 61. The installation position is located at the first gripping part 11. At the installation position, the housing 10 has a first distance L1 along the first axis 102. At the floating support 341, the housing 10 has a third distance L3 along the first axis 102. The ratio of the first distance L1 to the third distance L3 is greater than or equal to 0.65 and less than or equal to 0.75. This arrangement ensures that the dimensions of the reciprocating saw 100 connecting part 13 in the vertical direction are within a relatively... Within a reasonable range, in some special working conditions, such as when the workpiece to be cut is in a narrow location, it often becomes impossible for the user to operate the saw 100 by holding the first gripper 11. In such cases, the user will hold the connecting part 13 with one hand and the second gripper 12 with the other to control the reciprocating saw 100. By setting the ratio of the vertical distance of the connecting part 13 to the vertical distance of the first gripper 11 within the aforementioned range, the connecting part 13 has sufficient space to accommodate the transmission assembly 32 and the reciprocating assembly 31, resulting in a more reasonable overall machine structure. Furthermore, the effect is even better when the ratio of the first distance L1 to the third distance L3 is greater than or equal to 0.5 and less than or equal to 0.7.

[0044] Furthermore, the transmission assembly 32 also includes a positioning assembly for positioning the first transmission member 321. The positioning assembly is disposed on the lower side of the first transmission member 321 and includes at least one positioning bearing 324. Specifically, the first transmission member 321 includes a meshing surface 3212 opposite to the cam surface 3211, i.e., the cam surface 3211 is disposed on the upper side of the meshing surface 3212. Understandably, the positioning bearing 324 is located on the lower side of the meshing surface 3212. To better position the first transmission member 321 and ensure structural strength, the transmission assembly 32... Two positioning bearings 324 are internally arranged. In this embodiment, the two positioning bearings 324 are arranged adjacent to each other, that is, the positioning bearings 324 are at least partially in contact with each other. The housing 10 at the axis of the positioning bearings 324 has a second distance L2 in the direction along the first axis 102. The ratio of the first distance L1 to the second distance L2 is greater than or equal to 0.6 and less than or equal to 0.8. By setting it this way, the size of the connecting part 13 in the vertical direction can be effectively reduced while ensuring the structural strength of the transmission component 32, making it easier for the user to hold the connecting part 13. It should be noted that in this embodiment, the dimensions of L3 and L2 are approximately the same. While ensuring structural strength, there can also be only one or more positioning bearings 324. Furthermore, the effect is better when the ratio of the first distance L1 to the second distance L2 is greater than or equal to 0.58 and less than or equal to 0.78.

[0045] Please refer to Figure 3 , Figures 10 to 12The balance block 331 is disposed between the cam surface 3211 and the reciprocating motion component 311. When the reciprocating saw 100 is running, the balance block 331 can move in the opposite direction to the reciprocating motion component 311 to balance the reciprocating motion of the reciprocating motion component 311. In this embodiment, the balance block 331 is disposed inside the gearbox 14 and can slide inside the gearbox 14, and the balance block 331 is disposed in close contact with the gearbox 14. Specifically, the balance block 331 includes a first segment 3312, a connecting segment 3313, and a second segment 3314. The connecting segment 3313 is used to connect the first segment 3312 and the second segment 3314. The first segment 3312 is located on the front side of the connecting segment 3313, that is, the first segment 3312 is located near the saw blade 50. Specifically, the first segment 3312 is long and thin and is located inside the first gripping part 11. The second segment 3314 is located near the floating support 341, that is, the second segment 3314 is located inside the connecting part 13. The edge of the connecting segment 3313 is irregular and basically fits the inside of the gearbox 14. A sliding member 3316 is connected to the gearbox 14, and a sliding groove 3315 is provided on the balance block 331 to cooperate with the sliding member 3316. Specifically, the second section 3314 has a sliding groove 3315 that cooperates with the sliding member 3316 fixedly connected to the gearbox 14, so that the balance block 331 can slide relative to the gearbox 14. To ensure stability, multiple sliding grooves 3315 are provided on the balance block 331. Of course, the sliding grooves and the sliding member are located in opposite positions, that is, the balance block has a sliding member, and the gearbox has sliding grooves.

[0046] The first segment 3312 has a first length D1 along the first straight line 103, and the second segment 3314 has a second length D2 along the first straight line 103, wherein the ratio of the first length D1 to the second length D2 is greater than or equal to 0.25 and less than or equal to 0.55. This arrangement allows the first segment 3312 to make full use of the space within the first gripping part 11, resulting in a more rational overall layout.

[0047] The ratio of the volume of the first segment 3312 to the volume of the balance block 331 is greater than or equal to 0.05 and less than or equal to 0.35. According to the mass calculation formula, with constant density, volume is directly proportional to weight, meaning that the larger the volume, the greater the weight. This range also reflects the ratio of the weight of the first segment 3312 to the total weight of the balance block 331. Thus, we can understand that the ratio of the weight of the balance block 331 extending into the first gripping part 11 to the total weight of the balance block 331 is within a reasonable range. This arrangement makes full use of the space within the first gripping part 11, thereby providing sufficient space within the connecting part 13 to accommodate structures such as the swing assembly 34. When the weight of the first segment 3312, located within the connecting part 13 or within the first gripping part 11, is too low relative to the overall weight of the balance block 331, the second segment 3314 will inevitably increase in length to ensure the reciprocating motion of the reciprocating component 311, thus increasing the overall length of the machine and making the reciprocating saw 100 too long, which is inconvenient for user operation. Conversely, when the weight of the first segment 3312 within the first gripping part 11 is too high relative to the overall weight of the balance block 331, the volume of the first segment 3312 within the first gripping part 11 will inevitably increase, resulting in a larger vertical dimension of the first segment 3312, which in turn makes the reciprocating saw 100 too long, also inconvenient for user gripping. Furthermore, a ratio of the volume of the first segment to the volume of the balance block of 0.1 or less than or equal to 0.3 yields better results.

[0048] Please refer to Figure 1 , Figure 3 , Figures 13 to 16The power assembly 20 also includes a barrel 25, a cooling fan 22, a cover plate 23, and a flow guide assembly 24. The barrel 25 is fitted around the circumference of the motor 21, with the motor 21 at least partially disposed within the barrel 25. The cooling fan 22 generates cooling airflow and is driven by the motor shaft 211 to rotate about its axis. The cover plate 23 is disposed between the cooling fan 22 and the stator 212, and includes a central hole 231 allowing the motor shaft 211 and cooling airflow to pass through, a rear side 233 adjacent to the stator 212, and a front side 232 away from the stator 212 relative to the rear side 233. The airflow guiding component 24 is at least partially disposed on the outer periphery of the cover plate 23. The airflow guiding component 24 is configured to restrict the movement of cooling airflow around the outer periphery of the cover plate 23. That is, the airflow guiding component 24 cooperates with the cover plate 23 to prevent cooling airflow from swirling back to the rear side 233. Alternatively, the airflow guiding component 24 cooperates with the cover plate 23 to prevent cooling airflow from exiting from the outer periphery of the cover plate 23 and not from exiting through the central hole 231 of the cover plate 23. Specifically, the cooling fan 22 is disposed in front of the stator 212 and is mounted on the motor shaft 211, rotating synchronously with the motor shaft 211. An air outlet 110 for discharging cooling airflow is provided on the housing 10 at a position circumferential to the airflow guiding component 24. An air inlet 120 for entering cooling airflow is formed on the housing 10 behind the motor 21, specifically behind the PCB board. When the user drives the motor 21 to rotate, the bevel gear fixedly connected to or integrally formed on the motor shaft 211 meshes with the meshing surface 3212 of the first transmission component 321, transmitting the rotational motion of the motor 21 to the first transmission component 321. When the motor 21 rotates, the cooling fan 22 is driven to rotate, and the cooling airflow enters from the air inlet 120, flows through the PCB board, enters the stator 212, and then passes through the center hole 231 of the cover plate 23. Part of the cooling airflow is guided by the flow guide component 24 and discharged from the air outlet 110 on the housing 10 around the cooling fan 22. Part of the cooling airflow continues to flow forward to the gearbox 14 to dissipate heat for the gearbox 14, and finally flows out from the opening at the front end of the housing 10. During rotation, the cooling fan 22 creates a high-pressure area and a low-pressure area in the corresponding regions of the front side 232 and rear side 233. Cooling airflow is drawn into the low-pressure area and then enters the high-pressure area. Through the cooperation of the airflow guide component 24 and the cover plate 23, the flow of cooling air from the low-pressure area corresponding to the rear side 233 into the high-pressure area corresponding to the front side 232 is obstructed. Some airflow is then drawn back into the low-pressure area corresponding to the rear side 233, creating a swirling airflow and causing turbulence. This allows hot air from the high-pressure area to enter the low-pressure area, affecting heat dissipation. Therefore, this design effectively plans the flow path of the cooling airflow, improving cooling efficiency. In this application, the cooling fan 22 is specifically a centrifugal fan.

[0049] The air intake assembly 24 is disposed inside the housing 10. The air intake assembly 24 and the cover plate 23 are rotatable relative to each other. The air intake assembly 24 has an opening through which the motor 21 can pass. Specifically, the opening is roughly circular, but it can be other shapes, such as regular polygons, etc., which are not limited here. In this application, it is preferably circular. By providing an opening on the air intake assembly 24, it is convenient to install the motor 21. The air intake assembly 24 is arranged around the cooling fan 22, that is, the size of the opening of the air intake assembly 24 is larger than the outer diameter of the motor 21.

[0050] like Figures 13 to 20As shown, the inner wall of the drainage component 24 has an inner diameter A1 along the direction perpendicular to the first rotation axis 101; the outer periphery of the cover plate 23 has an outer diameter B1 along the direction perpendicular to the first rotation axis 101; wherein, the ratio of the inner diameter A1 to the outer diameter B1 is greater than or equal to 0.8 and less than or equal to 1.2. In one embodiment, the drainage component 24 and the cover plate 23 do not contact each other; the projection portions of the drainage component 24 and the cover plate 23 on the plane perpendicular to the first rotation axis 101 coincide, that is, the drainage component 24 is disposed on the outer side of the cover plate 23 and overlaps with the radial portion of the cover plate 23, forming a labyrinth structure between the cover plate 23 and the drainage component 24, or the ratio of the inner diameter A1 to the outer diameter B1 is greater than or equal to 0.8 and less than 1. Specifically, the drainage component 24 is connected to the barrel 25, specifically, the drainage component 24 is fixedly connected to the barrel 25 or integrally formed, or the drainage component 24 is fixedly connected to the housing 10 or integrally formed. The cover plate 23 is fixedly connected to the cooling fan 22, meaning that the airflow assembly 24 and the cover plate 23 can rotate relative to each other. In this embodiment, the cover plate 23 is fixedly connected to the cooling fan 22. Specifically, the cooling fan 22 is provided with a positioning post extending rearward along the first rotation axis 101, and the cover plate 23 is formed with a limiting hole corresponding to the positioning post. That is, the limiting hole on the cover plate 23 is fitted onto the positioning post, thereby achieving synchronous rotation. The cover plate 23 also includes an extension portion 234 extending rearward along a straight line. The straight line is parallel to or obliquely intersecting the first rotation axis 101. This is not limited here. In this application, the example of the straight line being parallel to the first rotation axis 101 is used for illustration. However, any limitation on the extension portion 234 in the following text also applies to the case where the straight line is obliquely intersecting the first rotation axis 101. The drainage component 24 is provided with a radially inwardly oriented ring 241, which has an opening through which the motor 21 can pass. The inner wall of the ring 241 has an inner diameter A2 in the direction perpendicular to the first rotation axis 101, and the extension 234 has an outer diameter B2 in the direction perpendicular to the first rotation axis 101. The ratio of A2 to B2 is greater than or equal to 1.02 and less than or equal to 1.2. That is, the ratio of the outer diameter of the extension 234 to the inner diameter of the ring 241 is greater than or equal to 1.02 and less than or equal to 1.2. This arrangement ensures that the cover plate 23 and the support of the drainage component 24 have sufficient space to allow the cover plate 23 to rotate relative to the drainage component 24, while also preventing the cooling airflow from swirling back to the low-pressure area and avoiding airflow turbulence. It should be noted that the inner diameter A2 of the ring 241 in this embodiment is also the inner diameter A1 of the drainage component 24. When the ratio of the outer diameter of the extension 234 to the inner diameter of the ring 241 is greater than or equal to 1.07 and less than or equal to 1.15, the effect is better. Of course, as another feasible implementation, such as... Figures 19 to 20As shown, the flow-guiding component 24a does not contact the cover plate 23a. The ring 241a of the flow-guiding component 24a is disposed adjacent to the cover plate 23a. The ring 241a overlaps the cover plate 23a at least partially in the axial direction, while the outer periphery of the ring 241a does not overlap the cover plate 23a in the radial direction. In this embodiment, the ratio of the inner diameter of the ring 241a to the outer diameter of the cover plate 23a is greater than or equal to 1 and less than or equal to 1.2. With this setting, the effect of the embodiment described above can be basically achieved, that is, the flow-guiding component 24a is set to cooperate with the cover plate 23a to block more than or equal to 90% of the cooling airflow from the first region to the second region. Of course, there can also be no ring, the inner diameter of the flow-guiding component is greater than the outer diameter of the cover plate, and the ratio of the inner diameter of the flow-guiding component to the outer diameter of the cover plate is greater than or equal to 1 and less than or equal to 1.2.

[0051] The airflow guiding component 24 has several stop portions 242 arranged in the circumferential direction. The stop portions 242 are fixedly connected to the airflow guiding component 24 or integrally formed. Several spaced stop ribs 243 are arranged on the stop portions 242. The stop ribs 243 are arranged in the circumferential direction of the cooling fan 22. The stop ribs 243 and the blades of the cooling fan 22 overlap at least partially in the axial direction of the first rotation axis, which can effectively guide the flow of cooling air. The stop portions 242 are located at the air outlet 110. Specifically, the stop ribs 243 form a guide channel, which basically corresponds to the blades of the cooling fan 22. It is used to guide the cooling airflow output by the cooling fan 22. That is, through the above arrangement, the cooling airflow can be better discharged from the air outlet 110. At the same time, it can also prevent the user from directly contacting the cooling fan 22, thereby protecting the cooling fan 22 and ensuring the normal operation of the reciprocating saw 100. To better guide the cooling airflow, the edge surface of the baffle 243 is configured to be inclined to guide the motor shaft 211. With the above configuration, the cooling airflow can be guided to flow downward at an angle, avoiding the cooling airflow from blowing onto the user, especially avoiding blowing into the user's eyes, which could cause a safety accident. In this application, the distance H between the edge surfaces of two adjacent baffles 243 is less than or equal to 15mm. By setting the gap of the baffles 243 within the above range, it is possible to effectively prevent the user's fingers from touching the cooling fan 22 and affecting the operation of the cooling fan 22.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A power tool, comprising: a housing; a power assembly arranged in the housing for providing a power source, the power assembly comprising a motor including a motor shaft rotatable about a first rotation axis, the power assembly further comprising a motor cylinder arranged circumferentially around the motor; an output assembly connected to the power assembly for outputting the power; the power assembly further comprising: a cooling fan for generating a cooling air flow, the cooling fan being arranged to be driven to rotate by the motor; characterized in that: the power assembly further comprising: a cover plate fixedly connected to the cooling fan, the cover plate including a central hole allowing the motor shaft and the cooling air flow to pass through, the motor being arranged at a rear side of the cover plate; a flow guide assembly arranged at least partially around an outer periphery of the cover plate; the flow guide assembly being arranged to restrict the cooling air flow from moving around the outer periphery of the cover plate; the cooling fan having a base, the base being provided with a fan blade at a side close to the motor, the fan blade being arranged to rotate with the cooling fan when the motor drives the cooling fan to rotate, thereby forming the cooling air flow; the flow guide assembly, the cover plate and the cooling fan cooperating to restrict the air flow at a front side of the cover plate from reaching the motor; the flow guide assembly being fixedly connected to or integrally formed with the motor cylinder, the flow guide assembly being provided with an opening, the opening of the flow guide assembly having a size greater than an outer diameter of the motor.

2. The power tool according to claim 1, characterized in that: the cover plate is rotatable relative to the flow guide assembly.

3. The power tool according to claim 2, characterized in that: an inner wall of the flow guide assembly has an inner diameter A1 in a direction perpendicular to the first rotation axis; an outer periphery of the cover plate has an outer diameter B1 in the direction perpendicular to the first rotation axis; wherein a ratio of the A1 to the B1 is greater than or equal to 0.8 and less than or equal to 1.

2.

4. The power tool according to claim 3, characterized in that: the flow guide assembly is arranged around the cover plate, the flow guide assembly including a ring, the ring at least radially overlapping the outer periphery of the cover plate.

5. The power tool according to claim 4, characterized in that: the cover plate includes an extension extending rearwardly; an inner wall of the ring has an inner diameter A2 in a direction perpendicular to the first rotation axis; the extension has an outer diameter B2 in the direction perpendicular to the first rotation axis; wherein a ratio of the A2 to the B2 is greater than or equal to 1.02 and less than or equal to 1.

2.

6. The power tool according to claim 1, characterized in that: the cooling fan is provided with a positioning post extending rearwardly along the first axis; the cover plate is provided with a limiting hole adapted to the positioning post to be inserted into.

7. The power tool according to claim 2, characterized in that: the flow guide assembly includes a ring, the ring being provided with a plurality of stop portions, the stop portions including a plurality of stop ribs arranged at intervals, the stop ribs being located at an outer periphery of the cooling fan.

8. The power tool according to claim 7, characterized in that: the stop ribs at least partially overlap the fan blades of the cooling fan in an axial direction of the first rotation axis.

9. The power tool of claim 7, wherein: the stop portion is arranged corresponding to an air outlet on the housing.

10. The power tool of claim 1, wherein: the power tool further comprises: a transmission assembly comprising a first transmission member capable of being driven by the motor shaft to rotate about a first axis, the first transmission member comprising a cam surface; a swing assembly arranged between the transmission assembly and the reciprocating assembly, the swing assembly comprising: a floating support connected to the reciprocating assembly and capable of being driven by the cam surface to reciprocate in an up-down direction; a counterweight at least partially arranged between the transmission assembly and the reciprocating assembly and configured to balance the reciprocating assembly; the counterweight comprises an avoiding opening arranged to allow the floating support to be driven by the cam surface to reciprocate in the up-down direction.

11. The power tool of claim 1, wherein: the drainage assembly is arranged outside the cover plate, and the drainage assembly overlaps with a radial portion of the cover plate, the drainage assembly not being in contact with the cover plate.

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