CN113909566A

CN113909566A - Electric tool

Info

Publication number: CN113909566A
Application number: CN202010655034.XA
Authority: CN
Inventors: 周洋; 高�浩
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2022-01-11

Abstract

The invention discloses an electric tool, comprising: a housing; the power assembly is arranged in the shell and used for providing a power source, and comprises a motor, and the motor comprises a motor shaft capable of rotating around a first rotating axis; the output assembly is connected with the power assembly and used for outputting power; the power assembly further includes: a cooling fan for generating a cooling air flow, the cooling fan being configured to be rotated by a motor; the power assembly further includes: 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 therethrough; the drainage component is at least partially arranged on the periphery of the cover plate; the flow directing assembly is configured to restrict the flow of cooling air from moving around the periphery of the cover plate. This electric tool radiating effect is good.

Description

Electric tool

Technical Field

The invention relates to an electric tool.

Background

Reciprocating saws are power tools that saw with a reciprocating saw blade, often used to saw sheet metal, tubing, profiles, or cut bevel cuts in steel pipe. The reciprocating saw on the market at present usually converts the torque of a motor into the linear reciprocating motion of a saw blade through a transmission mechanism to realize cutting, and the motor inevitably generates a large amount of heat when rotating, so that the motor can better dissipate heat, which is always pursued by technical personnel in the field.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide an electric tool with a good heat dissipation effect.

In order to achieve the above object, the present invention adopts the following technical solutions: a power tool, comprising: a housing; the power assembly is arranged in the shell and used for providing a power source, and comprises a motor, and the motor comprises a motor shaft capable of rotating around a first rotating axis; the output assembly is connected with the power assembly and used for outputting power; the power assembly further includes: a cooling fan for generating a cooling air flow, the cooling fan being configured to be rotated by a motor; the power assembly further includes: 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 therethrough; the drainage component is at least partially arranged on the periphery of the cover plate; the flow directing assembly is configured to restrict the flow of cooling air from moving around the periphery of the cover plate.

Further, the apron can rotate relative the drainage subassembly, sets up the opening that can supply the motor to pass on the drainage subassembly.

Further, the inner wall of the flow directing assembly has an inner diameter a1 in a direction perpendicular to the first axis of rotation; the outer periphery of the cover plate has an outer diameter B1 along 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.

Further, a drain assembly is disposed about the cover plate, the drain assembly including a ring radially overlapping at least an outer periphery of the cover plate.

Further, the cover plate includes an extension extending rearward; the inner wall of the collar has an inner diameter a2 in a direction perpendicular to the first axis of rotation; the extension portion has an outer diameter B2 in a direction perpendicular to the first axis of rotation; wherein the ratio of A2 to B2 is more than or equal to 1.02 and less than or equal to 1.2.

Furthermore, a positioning column extending backwards along the first axial direction is arranged on the cooling fan; the cover plate is provided with a limiting hole suitable for the positioning column to insert.

Further, the drainage subassembly is still including locating a plurality of backstop portions on the ring, and backstop portion includes the backstop muscle that a plurality of intervals set up, and the backstop muscle is located cooling fan's periphery.

Further, the stop rib overlaps at least a part of the cooling fan blade in the axial direction of the first rotation axis.

Furthermore, the stopping part is arranged corresponding to the air outlet on the machine shell.

Further, 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 electric power tool further includes: the swing subassembly sets up between transmission assembly and the subassembly that reciprocates, and the swing subassembly includes: a floating support connected to the shuttle assembly and drivable by the cam surface to reciprocate in an up-down direction; the balance block is at least partially arranged between the transmission assembly and the reciprocating assembly and is used for balancing the reciprocating assembly; the balancing piece includes: an escape opening configured to allow the floating support to be driven by the cam surface to reciprocate in an up-down direction.

The invention has the advantages that: through setting up drainage subassembly and the apron of mutually supporting in cooling fan department, hinder cooling fan cooling air current and remove at the periphery of apron, and then fine planning cooling air current's circulation route, improve cooling efficiency.

Drawings

FIG. 1 is a perspective view of a reciprocating saw in an embodiment of the present invention;

FIG. 2 is a plan view of the reciprocating saw shown in FIG. 1;

FIG. 3 is a plan view of a portion of the structure of the reciprocating saw shown in FIG. 1;

FIG. 4 is a plan view of a portion of the structure of the reciprocating saw shown in FIG. 1;

FIG. 5 is a cross-sectional view of a portion of the structure of the reciprocating saw shown in FIG. 4 taken along the line A-A;

FIG. 6 is a plan view of a portion of the reciprocating saw shown in FIG. 1 with the blade assembly in a support position;

FIG. 7 is a perspective view of a portion of the structure shown in FIG. 1;

FIG. 8 is a plan view of a portion of the reciprocating saw shown in FIG. 1 with the blade lifting assembly in a released position;

FIG. 9 is a perspective view of a portion of the structure shown in FIG. 7;

FIG. 10 is a top view of a portion of the structure of the reciprocating saw shown in FIG. 1;

FIG. 11 is an exploded view of a portion of the structure of the reciprocating saw shown in FIG. 1;

FIG. 12 is a top view of the counterbalance of the reciprocating saw of FIG. 1;

FIG. 13 is a plan view of a portion of the structure of the reciprocating saw shown in FIG. 1;

FIG. 14 is a cross-sectional view of a portion of the structure of the reciprocating saw shown in FIG. 11;

FIG. 15 is an exploded view of a portion of the structure of the reciprocating saw shown in FIG. 1;

FIG. 16 is another perspective view of an exploded view of a portion of the structure of the reciprocating saw shown in FIG. 15;

FIG. 17 is a plan view of the drainage assembly of the reciprocating saw of FIG. 1;

FIG. 18 is a perspective view of the drainage assembly of the reciprocating saw of FIG. 1;

FIG. 19 is a plan view of another embodiment of the power assembly of the present invention;

fig. 20 is a cross-sectional view of the structure of fig. 19 taken along the direction a-a.

Detailed Description

The invention is described in detail below with reference to the figures and the embodiments.

For clarity of explanation of the technical solution of the present application, upper, lower, front, rear, left and right as shown in fig. 1 are defined.

Referring to fig. 1, a cutting tool, specifically, a power cutting tool, according to the present invention is illustrated in detail by referring to a reciprocating saw 100 in the embodiment of the present application.

A reciprocating saw 100 as shown in fig. 1 to 5 includes: a housing 10, a power assembly 20, a reciprocating assembly 31, a transmission assembly 32, a damping assembly 33 and a swinging assembly 34, an energy source device 40 and a cutting accessory. Wherein a power assembly 20 is provided in the housing 10 for powering the reciprocating saw 100, the power assembly 20 comprising a motor 21, the motor 21 comprising a motor shaft 211 rotatable about the first axis of rotation 101 and a stator 212 for generating a magnetic field. The energy source device 40 is mounted on the casing 10 for providing energy source, in the embodiment, the energy source device 40 is embodied as a battery pack 41, but the battery pack 41 and the casing 10 may be separately arranged, i.e. the battery pack 41 is not directly mounted on the surface of the casing 10. The housing 10 is fixedly connected or integrally formed with a first grip portion 11, a second grip portion 12, and a connecting portion 13 connecting the first grip portion 11 and the second grip portion 12, which can be gripped by a user, the first grip portion 11 is disposed adjacent to the cutting accessory in the front-rear direction, the second grip portion 12 is disposed at the rear side of the reciprocating saw 100, and the second grip portion 12 is a handle. The transmission assembly 32 is disposed in the connection region for converting the rotational motion output by the motor shaft 211 into a reciprocating motion of the reciprocating assembly 31, and one end of the reciprocating assembly 31 is connected to the transmission assembly 32, and the other end is used for connecting a cutting accessory, in this embodiment, a saw blade 50. The dampening assembly 33 moves in a direction generally opposite the reciprocating assembly 31 during operation of the reciprocating saw 100 to balance the reciprocating movement of the reciprocating assembly 31, the dampening assembly 33 including a weight 331. The oscillating assembly 34 is disposed adjacent to the reciprocating assembly 31 and is capable of providing a supporting force to the reciprocating assembly 31 that is different from the direction of movement of the reciprocating assembly 31, thereby enabling the reciprocating assembly 31 to rotate about the second axis 104. In the present embodiment, the transmission assembly 32, the damper assembly 33, and the swing assembly 34 are all disposed within the receiving cavity of the gear case 14.

Referring to fig. 4 to 7, in particular, the reciprocating assembly 31 includes a reciprocating member 311 disposed substantially along the direction of the self axis, the reciprocating member 311 can reciprocate along the direction of the self axis relative to the housing 10 when driven by the motor shaft 211, and an output unit may be disposed at an end of the reciprocating member 311 for connecting the saw blade 50. The transmission assembly 32 includes a first transmission member 321 capable of being driven by the motor 21 to rotate around the first axis 102, a rotation member 322 fixedly connected to the first transmission member 321 and disposed on an upper side of the first transmission member 321, and an eccentric member 323 connected to the rotation member 322 and capable of being driven by the rotation member 322 to rotate, the eccentric member 323 is engaged with the guide groove 316 of the reciprocating member, the eccentric member 323 is capable of sliding in the guide groove 316, and a length of the eccentric member 323 in the front-rear direction substantially coincides with a width of an inner wall of the guide groove 316 in the front-rear direction. That is, the eccentric member 323 is driven to rotate so as to perform the reciprocating motion of the reciprocating member 311. Further, the surface of the eccentric member 323 is formed in a spherical shape, and is disposed such that the third transmission member 323 can be better engaged with the guide groove of the reciprocating member 311 when rotating. The swing assembly 34 includes a floating support 341 disposed between the first transmission member 321 and the reciprocating member 311, the floating support 341 is configured to implement transmission connection between the reciprocating member 311 and the first transmission member 321, the first transmission member 321 includes a cam surface 3211, and the floating support 341 can implement transmission between the cam surface 3211 and the reciprocating member 311, that is, the cam surface 3211 can drive the floating support 341 to make floating motion in the up-down direction, that is, the cam surface 3211 can drive the reciprocating member 311 to rotate back and forth along the second axis 104. It should be noted that the floating motion means that the cam surface 3211 drives the floating support 341 to reciprocate up and down, that is, when the cam surface 3211 applies a supporting force to the floating support 341, the floating support 341 is forced to rotate along its axis and can also move up and down. In addition, the floating movement may be interpreted as that the cam surface 3211 drives the floating support 341 to reciprocate in a direction obliquely intersecting the first axis 101.

In the up-down direction, the weight 331 is disposed between the reciprocating member 311 and the first transmission member 321, the weight 331 is provided with an escape port 3311 allowing the floating support member 341 to protrude thereinto, it can be understood that the counterweight 331 is at least partially coincident with the projection of the floating support 341 onto the plane of the first axis 102, and, as such, the dimension of the connecting portion 13 of the reciprocating saw 100 in the vertical direction can be made reasonable, and by using the cam surface 3211 of the first transmission piece 321 as the cutter lifting inclined surface, the structure for lifting the cutter is realized by matching with the floating support 341, so that the space at the upper side of the first transmission piece 321 can be fully utilized, the structure of the whole machine is more compact, thereby reducing the dimension of the floating support 341 in the up-down direction and avoiding an increase in the dimension of the reciprocating saw 100 in the front-rear direction while ensuring a reduction in the dimension of the reciprocating saw 100 in the up-down direction. Further, the situation that when the cutter lifting is realized in other modes, other parts are needed to be arranged to drive the reciprocating motion part 311 and the balance block 331, so that the structure is too complex is avoided, namely, the structure is greatly simplified. It is noted that in the present application, the first axis 102 extends substantially in the up-down direction.

Referring to fig. 6 to 9, the swing assembly 34 is disposed on the upper side of the first transmission member 321 and 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 341 is movable between a supporting position and a releasing position. Specifically, when the floating support 341 is in the release position, the cam surface 3211 is separated from the floating support 341, where the separation means that the cam surface 3211 is not in contact with the floating support 341, and may also mean that there is contact between the cam surface 3211 and the floating support 341, but there is no supporting force. When the floating support 341 is in the supporting position, the cam surface 3211 contacts the floating support 341. It should be noted that, when the floating support 341 is in the supporting position, the blade lifting amount of the reciprocating saw 100 is the maximum, that is, the first transmission member 321 is always in contact with the floating support 341 during the rotation, when the floating support 341 is in the releasing position, that is, the reciprocating member 311 is only driven by the driving force of the slider during the movement, at this time, there is no supporting force between the first transmission member 321 and the floating support 341 during the rotation. The swing assembly 34 further includes an operating handle 342 and a blade lifting bracket 343, the operating handle 342 being used to operate the floating support 341 to move between the support position and the release position, the operating handle 342 being in particular mounted to the gear box 14. The floating support 341 is rotatably connected to the knife lifting bracket 343, wherein when the knife lifting bracket 343 moves, the floating support 341 moves along with it, and the knife lifting bracket 343 is fixedly connected to the shuttle 311. The operating handle 342 extends along the first line 103, and the operating handle 342 can rotate at the position of the first line 103, and during the rotation of the operating handle 342, the sleeve 312 on the reciprocating member 311 can be driven, so that the floating support 341 is at the supporting position and the releasing position. In this embodiment, the operating handle 342 is embodied as a cylinder, wherein the operating handle 342 is provided with a concave surface 3421 and a circular arc surface 3422, the concave surface 3421 is in contact with the sleeve 312 when the floating support 341 is in the supporting position, and the circular arc surface 3422 is in contact with the sleeve 312 when the floating support 341 is in the releasing position. For convenience of description, the support position is defined as an initial position of the floating support 341, specifically, when the operating handle 342 rotates from the initial position along the first direction T around the first straight line 103, the operating handle 342 drives the sleeve to move upward, so as to drive the cutter lifting bracket 343 to move away from the cam surface 3211; when the operating handle 342 is rotated about the first line 103 in the second direction F to the release position, the operating handle 342 drives the sleeve downward, thereby bringing the bracket closer to the cam surface 3211. It can be seen that the operating handle 342 has a plurality of intermediate positions that can be held during rotation, and when the floating support 341 is at a certain intermediate position, the cam surface 3211 may partially contact the floating support 341 during rotation of the first transmission 321, i.e., when the first transmission 321 rotates, only a portion of the cam surface 3211 may have a supporting force on the floating support 341. The larger the angle of rotation of the operating handle 342 in the first direction T, the smaller the area for generating the driving force to the floating support 341, that is, the smaller the blade lifting amount, and conversely, the larger the blade lifting amount. In one embodiment, the cam surface 3211 is an upper surface of the first transmission member 321, and in particular, the cam surface 3211 is a slope having a height difference, so as to achieve the knife lifting and thus the reciprocating movement of the floating support 341 substantially along the first axis 101. In another embodiment, a protrusion is fixedly connected to or integrally formed on an upper surface of the first transmission member, the cam surface is a surface of the protrusion, and the protrusion is irregular, that is, a projection of the protrusion on a plane perpendicular to the first axis is irregular, and the floating support member adapted to the cam surface may be arranged along a direction obliquely intersecting the first axis, so as to lift the knife, and further, the floating support member reciprocates along a direction obliquely intersecting the first axis. This arrangement enables a more compact construction.

In the fore-and-aft direction, the swing assembly 34 is disposed between the eccentric and the handle, that is, the swing assembly 34 is disposed at the rear end of the shuttle assembly 31, that is, the blade lifting bracket 343 is fixedly mounted to the sleeve 312 at the rear end of the shuttle 311, and the floating support 341 is disposed adjacent to the rear end of the shuttle 311. With such an arrangement, when the swing assembly 34 is disposed at the front side of the eccentric member, the opening of the avoiding opening 3311, which allows the floating support 341 to extend into the balance block 331, is too large, so that the structural strength of the balance block 331 is insufficient, and the balance block 331 is damaged due to vibration in the working process of the reciprocating saw 100, thereby affecting the use of the machine. Of course, the blade lifting bracket 343 may be mounted on other components at the rear end of the reciprocating assembly 31 as long as the blade lifting is achieved, and is not limited to where it is specifically mounted. Further, the avoiding port 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 larger than W2, that is, the avoiding port 3311 has a sufficient width to allow the floating support 341 to move.

Referring to fig. 2 to 3, the reciprocating saw 100 further includes a supporting seat assembly 60 at least partially disposed in the housing 10, the supporting seat assembly 60 includes a supporting seat 61, the supporting seat 61 is mounted on the housing 10, the housing 10 has at least one mounting position for mounting the supporting seat 61, and it should be noted that when the supporting seat 61 is fixedly connected to the housing 10, the mounting position refers to a position where the supporting seat 61 is fixedly connected to the housing 10; the installation position means a position of an adjusting member for adjusting a distance of the support base 61 extending out of the casing 10 when the support base 61 is slidably coupled to the casing 10. In the present embodiment, the supporting seat 61 is slidably connected to the housing 10, the adjusting button is used to adjust the position of the supporting seat 61, the mounting position is arranged at the first grasping portion 11, the housing 10 at the mounting position has a first distance L1 along the first axis 102, the housing 10 at the floating support 341 has a third distance L3 along the first axis 102, wherein 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, by this arrangement, the dimension of the connecting portion 13 of the reciprocating saw 100 in the up-down direction is within a reasonable range, in some special working conditions, such as requiring the workpiece to be cut at some narrow positions, when the user grasps the first grasping portion 11 to cut the workpiece, it is often impossible to work, when the user grasps the second grasping portion 12 with one hand to manipulate the reciprocating saw 100, by setting the ratio of the distance in the up-down direction at the connecting portion 13 to the distance in the up-down direction at the first grip portion 11 within the above range, the connecting portion 13 has enough space to dispose the transmission assembly 32, the reciprocating assembly 31, and the like, so that the structural arrangement of the whole machine is reasonable. Further, when the ratio of the first distance L1 to the third distance L3 is 0.5 or more and 0.7 or less, the effect is better.

Further, the transmission assembly 32 further 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, the positioning assembly includes at least one positioning bearing 324, specifically, the first transmission member 321 includes an engaging surface 3212 disposed opposite to the cam surface 3211, that is, the cam surface 3211 is disposed on the upper side of the engaging surface 3212, it can be understood that the positioning bearing 324 is disposed on the lower side of the engaging surface 3212, in order to better position the first transmission member 321 and ensure the structural strength, two positioning bearings 324 are disposed in the transmission assembly 32, in this embodiment, the two positioning bearings 324 are disposed adjacently, that is, at least a portion of the positioning bearings 324 are in contact, the casing 10 at the axis of the positioning bearings 324 has a second distance L2 along the first axis 102 direction, wherein, a 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, through setting up like this, can be guaranteeing the prerequisite of transmission assembly 32's structural strength, effectual reduction connecting portion 13 is at the ascending size in upper and lower side, and the user of being convenient for grips connecting portion 13. It should be noted that in the present embodiment, the L3 and the L2 are approximately the same size. The positioning bearing 324 may have only one or a plurality of bearings, while ensuring the structural strength. Further, when the ratio of the first distance L1 to the second distance L2 is equal to or greater than 0.58 and equal to or less than 0.78, the effect is better.

Referring to fig. 3, 10 to 12, the balance weight 331 is disposed between the cam surface 3211 and the reciprocating member 311, and when the reciprocating saw 100 is in operation, the balance weight 331 can move in a direction opposite to the reciprocating member 311 to balance the reciprocating movement of the reciprocating member 311. In the embodiment, the weight 331 is disposed inside the gear box 14 and can slide inside the gear box 14, and the weight 331 is substantially disposed in close contact with the gear box 14. Specifically, the balance weight 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 disposed at the front side of the connecting segment 3313, that is, the first segment 3312 is disposed adjacent to the saw blade 50, specifically, the first segment 3312 is slender and disposed in the first grasping portion 11, the second segment 3314 is disposed adjacent to the floating support 341, that is, the second segment 3314 is disposed in the connecting portion 13, and the edge of the connecting segment 3313 is irregular and substantially attached to the inside of the gear box 14. The gear case 14 is connected with a sliding member 3316, the balance weight 331 is provided with a sliding groove 3315 engaged with the sliding member 3316, and specifically, the second section 3314 is provided with a sliding groove 3315 engaged with the sliding member 3316 fixedly connected to the gear case 14, so that the balance weight 331 can slide relative to the gear case 14, and the balance weight 331 is provided with a plurality of sliding grooves 3315 for ensuring stability. Of course, the sliding groove and the sliding part are arranged at opposite positions, namely, the balance block is provided with the sliding part, and the gear box is provided with the sliding groove.

The first segment 3312 has a first length D1 along the first line 103 and the second segment 3314 has a second length D2 along the first line 103, wherein the ratio of the first length D1 to the second length D2 is in the range of 0.25 to 0.55. So set up, make first section 3312 make full use of the space in the first portion of grasping 11, make the complete machine arrange more rationally.

The ratio of the volume of the first segment 3312 to the volume of the weight 331 is in the range of 0.05 to 0.35. According to the mass calculation formula, under the condition that the density is not changed, the volume is proportional to the weight, that is, the larger the volume is, the larger the weight is, that is, the above range reflects the ratio range of the weight of the first segment 3312 to the whole weight of the balance 331, so that it can be understood that the ratio range of the weight of the balance 331 extending into the first grasping portion 11 to the weight of the whole balance 331 is in a reasonable range, and thus, the space in the first grasping portion 11 is fully utilized, and the connecting portion 13 has enough space to arrange the structures such as the swing component 34. When the first segment 3312 is disposed in the connecting portion 13 or the weight of the first segment 3312 in the first grasping portion 11 is too low to account for the total weight of the balance 331, in order to ensure the reciprocating motion of the reciprocating component 311, the second segment 3314 will tend to have a dimension in the length direction, and further increase the dimension of the whole machine in the length direction, so that the reciprocating saw 100 will be too long in the length direction, which is not beneficial to the user. When the weight of the first segment 3312 in the first grip portion 11 is too high relative to the weight of the balance 331, the first segment 3312 will tend to have a larger volume in the first grip portion 11, which will increase the dimension of the first segment 3312 in the vertical direction, and further increase the dimension of the reciprocating saw 100 in the vertical direction, which is not easy for the user to hold. Furthermore, when the ratio range of the volume of the first section to the volume of the balance block is greater than or equal to 0.1 and less than or equal to 0.3, the effect is better.

Referring to fig. 1, 3, and 13 to 16, the power assembly 20 further includes: barrel 25, cooling fan 22, cover plate 23 and flow directing assembly 24. And the cylinder 25 is sleeved on the periphery of the motor 21, and the motor 21 is at least partially arranged in the cylinder 25. A cooling fan 22 for generating a cooling air flow, and the cooling fan 22 is capable of being driven by the motor shaft 211 to rotate about an axis. And a cover plate 23 disposed between the cooling fan 22 and the stator 212, the cover plate 23 including a center hole 231 allowing the motor shaft 211 and the cooling air flow to pass therethrough, a rear side 233 adjacent to the stator 212, and a front side 232 remote from the stator 212 with respect to the rear side 233. The flow directing assembly 24 is at least partially disposed at the periphery of the cover plate 23. the flow directing assembly 24 is configured to restrict the cooling airflow from moving around the periphery of the cover plate 23, i.e., the flow directing assembly 24 cooperates with the cover plate 23 to prevent the cooling airflow from swirling to the rear side 233. it is also possible that the flow directing assembly 24 cooperates with the cover plate 23 to prevent the cooling airflow from exiting the periphery of the cover plate 23 and not the central aperture 231 of the cover plate 23. Specifically, the cooling fan 22 is disposed in front of the stator 212, and the cooling fan 22 is mounted to the motor shaft 211 and configured to rotate in synchronization with the motor shaft 211. An air outlet 110 for discharging cooling air flow is opened at a position on the casing 10 at the circumferential direction of the flow guide assembly 24. An air inlet 120 for the cooling air to enter is formed on the housing 10 behind the motor 21, specifically behind the PCB. When a user drives the motor 21 to rotate, a bevel gear fixedly connected to or integrally formed on the motor shaft 211 is engaged with the engaging surface 3212 of the first transmission member 321 to transmit the rotational motion of the motor 21 to the first transmission member 321, when the motor 21 rotates, the cooling fan 22 is driven to rotate, cooling airflow enters from the air inlet 120, flows through the PCB, enters the stator 212, further passes through the central hole 231 of the cover plate 23, part of the cooling airflow is guided by the flow guide assembly 24 to be discharged from the air outlet 110 on the housing 10 at the circumferential position of the cooling fan 22, and part of the cooling airflow continuously flows forward to the gear box 14 to dissipate heat of the gear box 14 and finally flows out from the opening at the front end of the housing 10. Wherein, in the rotating process of the cooling fan 22, a high pressure area and a low pressure area can be formed in the areas corresponding to the front side 232 and the back side 233, that is, the cooling airflow can be sucked from the low pressure area and then enter the high pressure area, and through the cooperation of the drainage component 24 and the cover plate 23, when the cooling airflow of the low pressure area corresponding to the back side 233 of the cooling fan 22 is prevented from flowing into the high pressure area corresponding to the front side 232, part of the airflow can be sucked into the low pressure area corresponding to the back side 233 again, thereby generating the swirling airflow and causing the airflow disorder, thereby enabling the hot airflow of the high pressure area to enter the low pressure area and affecting the heat dissipation, that is, the above arrangement can better plan the flow path of the cooling airflow, and the cooling efficiency is improved. In the present application, the cooling fan 22 is specifically a centrifugal fan.

The drainage component 24 is arranged in the machine shell 10, the drainage component 24 and the cover plate 23 can rotate relatively, and the drainage component 24 is provided with an opening through which the power supply machine 21 can pass. Specifically, the opening is substantially circular, but may be other shapes, such as a regular polygon, etc., without limitation, and is preferably circular in this application, and the motor 21 is conveniently installed by providing the opening on the drainage assembly 24. The flow guide assembly 24 is disposed around the cooling fan 22, that is, the opening of the flow guide assembly 24 is larger in size than the outer diameter of the motor 21.

As shown in fig. 13-20, the inner wall of the flow directing assembly 24 has an inner diameter a1 in a direction perpendicular to the first rotational axis 101; the outer periphery of the cover plate 23 has an outer diameter B1 in a direction perpendicular to the first rotation axis 101; wherein, the ratio of the inner diameter A1 to the outer diameter B1 is more than or equal to 0.8 and less than or equal to 1.2. In one embodiment, the flow directing assembly 24 is not in contact with the cover plate 23, and the flow directing assembly 24 coincides with a projection of the cover plate 23 on a plane perpendicular to the first rotation axis 101, that is, the flow directing assembly 24 is disposed outside the cover plate 23 and overlaps a radial portion of the cover plate 23, that is, the cover plate 23 and the flow directing assembly 24 form a labyrinth structure, and perhaps a 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 assembly 24 is connected to the barrel 25, and the drainage assembly 24 is fixedly connected to or integrally formed with the barrel 25, or the drainage assembly 24 is fixedly connected to or integrally formed with the casing 10. The cover plate 23 is fixedly connected with the cooling fan 22, that is, the flow guide assembly 24 and the cover plate 23 can rotate relatively. In the present 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 backward 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 sleeved on the positioning post, so as to form a synchronous rotation. The cover plate 23 further includes an extension portion 234 extending rearward along a straight direction, wherein the straight direction is parallel to the first rotation axis 101 or obliquely intersects with the first rotation axis 101, which is not limited herein, and the case where the straight direction is parallel to the first rotation axis 101 is exemplified in this application, but any limitation on the extension portion 234 is also applicable to the case where the straight direction obliquely intersects with the first rotation axis 101. The flow guiding assembly 24 is provided with a ring 241 facing radially inward, the ring 241 is provided with 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, wherein 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, so that the cover 23 and the bracket of the flow guiding assembly 24 have enough space for the cover 23 to rotate relative to the flow guiding assembly 24, and the cooling air flow cannot rotate to a low-pressure region to avoid air flow turbulence, it should be noted that the inner diameter a2 of the ring 241 in this embodiment is the inner diameter a1 of the flow guiding assembly 24. The ratio of the outer diameter of the extension 234 to the inner diameter of the ring 241 is 1.07 or more and 1.15 or less, which is more effective. Of course, as another possible embodiment, as shown in fig. 19 to 20, the flow inducing assembly 24a is not in contact with the cover plate 23a, the ring 241a of the flow inducing assembly 24a is disposed adjacent to the cover plate 23a, the ring 241a at least partially overlaps with the cover plate 23a in the axial direction, while the ring 241a does not overlap with the outer periphery of 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, so that, the effect of the embodiment described above can be substantially achieved, i.e. the flow-directing assembly 24a is arranged to cooperate with the cover plate 23a to stop the passage of more than or equal to 90% of the cooling air flow from the first region to the second region, certainly, the drainage assembly can also be provided with no ring, the inner diameter of the drainage assembly is larger than the outer diameter of the cover plate, and the ratio range of the inner diameter of the drainage assembly to the outer diameter of the cover plate is larger than or equal to 1 and smaller than or equal to 1.2.

The flow guiding assembly 24 is provided with a plurality of stopping portions 242 in the circumferential direction, the stopping portions 242 are fixedly connected with the flow guiding assembly 24 or integrally formed, the stopping portions 242 are provided with a plurality of stopping ribs 243 arranged at intervals, the stopping ribs 243 are arranged in the circumferential direction of the cooling fan 22, the stopping ribs 243 are at least partially overlapped with the blades of the cooling fan 22 in the axial direction of the first rotating axis, and further, the stopping portions 242 are disposed at the air outlet 110, and in particular, guide channels are formed between the stopping ribs 243, the guide channels substantially correspond to the blades of the cooling fan 22, and are used for guiding the cooling air output by the cooling fan 22, through the above arrangement, the cooling air flow can be discharged from the air outlet 110 better, and meanwhile, the user can be prevented from directly contacting the cooling fan 22, so that the cooling fan 22 is protected, and the normal operation of the reciprocating saw 100 is ensured. In order to better guide the cooling air flow, the edge surface of the stopping rib 243 is configured to be obliquely guided to the motor shaft 211, and by the above arrangement, the cooling air flow can be guided to flow obliquely downward, so that the cooling air flow is prevented from blowing onto the user, in particular, the cooling air flow is prevented from blowing into the eyes of the user, which causes a safety accident.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims

1. A power tool, comprising:

a housing;

the power assembly is arranged in the shell and used for providing a power source, and comprises a motor, wherein the motor comprises a motor shaft capable of rotating around a first rotating axis;

the output assembly is connected with the power assembly and used for outputting power;

the power assembly further includes:

a cooling fan for generating a cooling air flow, the cooling fan being configured to be rotated by the motor;

the method is characterized in that:

the power assembly further includes:

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 therethrough;

the drainage assembly is at least partially arranged on the periphery of the cover plate;

the flow directing assembly is configured to restrict the flow of cooling air from moving around the periphery of the cover plate.

2. The power tool of claim 1, wherein:

the cover plate can rotate relative to the drainage assembly, and an opening through which the motor can penetrate is formed in the drainage assembly.

3. The power tool of claim 2, wherein:

the inner wall of the flow guide assembly has an inner diameter A1 in a direction perpendicular to the first axis of rotation;

the outer periphery of the cover plate has an outer diameter B1 in a direction perpendicular to the first axis of rotation;

wherein the ratio of A1 to B1 is greater than or equal to 0.8 and less than or equal to 1.2.

4. The power tool of claim 3, wherein:

the drain assembly is disposed about the cover plate, the drain assembly including a ring that radially overlaps at least an outer periphery of the cover plate.

5. The power tool of claim 4, wherein:

the cover plate includes an extension extending rearward;

the inner wall of the collar has an inner diameter a2 in a direction perpendicular to the first axis of rotation;

said extension having an outer diameter B2 in a direction perpendicular to said first axis of rotation;

wherein the ratio of A2 to B2 is greater than or equal to 1.02 and less than or equal to 1.2.

6. The power tool of claim 1, wherein:

the cooling fan is provided with a positioning column which extends backwards along the direction of a first axis;

and a limiting hole suitable for the positioning column to be inserted is formed in the cover plate.

7. The power tool of claim 2, wherein:

the drainage assembly further comprises a plurality of stopping portions arranged on the ring, each stopping portion comprises a plurality of stopping ribs arranged at intervals, and the stopping ribs are located on the periphery of the cooling fan.

8. The power tool of claim 7, wherein:

the stop rib overlaps at least a portion of the cooling fan blade in an axial direction of the first axis of rotation.

9. The power tool of claim 7, wherein:

the stopping part is arranged corresponding to the air outlet on the shell.

10. The power tool of claim 1, wherein:

the transmission assembly comprises a first transmission piece which can be driven by the motor shaft to rotate around a first axis and comprises a cam surface;

the electric power tool further includes:

the swing subassembly, set up in the transmission subassembly with between the reciprocal subassembly, the swing subassembly includes: a floating support connected to the shuttle assembly and drivable by the cam surface to reciprocate in an up-down direction;

a counterbalance disposed at least partially between the drive assembly and the shuttle assembly for balancing the shuttle assembly;

the weight includes: an avoidance port configured to allow the floating support to be driven by the cam surface to reciprocate in an up-down direction.