Cutting tool

Abstract

The present invention discloses a cutting tool, comprising: a housing; a power assembly; a transmission assembly; a reciprocating assembly connected to the transmission assembly, the reciprocating assembly being configured to reciprocate along the axis direction of the fuselage, the reciprocating assembly including an output unit capable of mounting a cutting accessory; a swing assembly disposed between the transmission assembly and the reciprocating assembly; a balance weight, at least partially disposed between the transmission assembly and the reciprocating assembly and used for balancing the movement of the reciprocating assembly; the transmission assembly includes: a first transmission member capable of being driven by the power assembly to rotate around a first axis, in the direction along the first axis, the first transmission member includes a cam surface disposed at its end; the swing assembly includes: a floating support member, drivingly connected to the reciprocating assembly and the cam surface, and capable of being driven by the cam surface to reciprocate up and down; the balance weight includes: an avoidance opening disposed on the reciprocating movement path of the floating support member. The overall arrangement of the cutting tool is reasonable and the structure is compact.

Description

Technical Field

[0001] The present invention specifically relates to a cutting tool, and more specifically to a cutting tool with a tool-lifting structure. Background Art

[0002] A reciprocating saw is a cutting tool that uses a reciprocating saw blade for sawing. It is a type of electric saw and is often used for sawing metal sheets, pipes, profiles, or cutting bevels on steel pipes. Of course, it can also cut cables or other non-metallic materials. Generally, it consists of a housing, a motor, a transmission mechanism, a saw blade, etc. The transmission mechanism converts the torque of the motor into a linear reciprocating motion of the saw blade to achieve cutting.

[0003] At present, reciprocating saws are required in many occasions. In order to improve the cutting efficiency, a tool-lifting structure is provided on the reciprocating saw. However, when the existing reciprocating saws are provided with a tool-lifting structure, the size of the connecting part in the vertical direction is often too large, which is inconvenient for users to operate. Summary of the Invention

[0004] In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a cutting tool with a reasonable overall arrangement and a compact structure.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A cutting tool, comprising: a housing; and disposed within the housing: a power assembly for providing power; a transmission assembly connected to the power assembly; a reciprocating assembly connected to the transmission assembly, the reciprocating assembly being configured to reciprocate along the axis of the body, the reciprocating assembly including an output unit capable of mounting a cutting accessory; a swing assembly disposed between the transmission assembly and the reciprocating assembly; a balance weight at least partially disposed between the transmission assembly and the reciprocating assembly and for balancing the movement of the reciprocating assembly; the transmission assembly includes: a first transmission member capable of being driven by the power assembly to rotate about a first axis, in the direction along the first axis, the first transmission member includes a cam surface disposed at its end; the swing assembly includes: a floating support member drivingly connected to the reciprocating assembly and the cam surface, capable of being driven by the cam surface to reciprocate up and down; the balance weight includes: an avoidance opening disposed on the reciprocating movement path of the floating support member; the first axis extends substantially in the vertical direction.

[0006] Further, the power assembly includes a motor, and the motor includes a motor shaft capable of rotating about a first rotation axis;

[0007] The first transmission member further includes: an engagement surface disposed opposite to the cam surface, and the engagement surface engages with the end of the motor shaft.

[0008] Further, the transmission assembly further includes: a rotating member connected to the first transmission member and rotating coaxially therewith; an eccentric member connected to the rotating member and eccentrically disposed with respect to the axis of the rotating member, and the eccentric member is slidably connected to the reciprocating assembly.

[0009] Further, the transmission assembly further includes a positioning assembly for positioning the first transmission member. In the direction of the first axis, the positioning assembly is disposed on the lower side of the meshing surface away from the reciprocating assembly; the positioning assembly includes at least one positioning bearing.

[0010] Further, the housing includes a first gripping portion and a second gripping portion arranged front and rear. The first gripping portion is arranged close to the cutting accessory, and the second gripping portion is arranged at the rear side of the housing; the cutting tool further includes: a support base assembly mounted to the housing; the support base assembly includes a support base, and the support base is mounted on the housing. There is at least one mounting position on the housing for mounting the support base; the housing at the mounting position has a first distance L1 in the direction of the first axis; the housing at the axis of the positioning bearing has a second distance L2 in the direction of the first axis; where 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.

[0011] Further, the balance weight includes a first section, a connecting section, and a second section arranged front and rear. The connecting section connects the first section and the second section. The first section extends forward into the first gripping portion, and an avoidance opening is provided on the second section; where the first section has a first length D1 in the direction of the first straight line, and the second section has a second length D2 in the direction of the first straight line, where the ratio range 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.

[0012] Further, the ratio range of the volume of the first section to the volume of the balance weight is greater than or equal to 0.05 and less than or equal to 0.35.

[0013] Further, the avoidance opening has a width W1 in the left - right direction, and the floating support member has a diameter W2 in the left - right direction perpendicular to the up - down direction. Wherein, W1 is greater than W2.

[0014] Further, a sliding groove is formed on the balance weight for guiding the movement of the balance weight; a sliding member is installed in the housing and is matched with the sliding groove.

[0015] A cutting tool, comprising: a housing; and disposed within the housing: a power assembly for providing power; a transmission assembly connected to the power assembly; a reciprocating assembly connected to the transmission assembly, the reciprocating mechanism being configured to reciprocate along the axis of the fuselage, the reciprocating assembly including an output unit for mounting an accessory; a swing assembly disposed between the transmission assembly and the reciprocating assembly; a balance weight at least partially disposed between the transmission assembly and the reciprocating assembly and for balancing the reciprocating assembly; the transmission assembly includes: a first transmission member capable of being driven by the power assembly to rotate about a first axis, in the direction along the first axis, the first transmission member includes a cam surface disposed at an end; the swing assembly includes: a floating support member connected to the reciprocating assembly and capable of being driven by the cam surface to perform a floating motion in a direction intersecting the first axis obliquely; the balance weight includes: an avoidance opening configured to allow the floating support member to perform a floating motion in a direction intersecting the first axis obliquely when driven by the cam surface. Eccentric member

[0016] The beneficial effect of the present invention is that: by providing an avoidance opening on the balance weight into which the floating support member can extend, the upper space of the transmission member is fully utilized, thereby reducing the size of the whole machine in the up and down direction, making the layout of the whole machine reasonable and the structure compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view of a reciprocating saw in an embodiment of the present invention;

[0018] Figure 2 is Figure 1 a plan view of the reciprocating saw shown;

[0019] Figure 3 is Figure 1 a plan view of a partial structure in the reciprocating saw shown;

[0020] Figure 4 is Figure 1 a plan view of a partial structure in the reciprocating saw shown;

[0021] Figure 5 is Figure 4 a cross-sectional view of a partial structure of the reciprocating saw shown along the A-A direction;

[0022] Figure 6 is Figure 1 a plan view of a partial structure of the reciprocating saw shown when the knife-lifting assembly is in the supporting position;

[0023] Figure 7 is Figure 1 a perspective view of the partial structure shown;

[0024] Figure 8 is Figure 1 a plan view of a partial structure of the reciprocating saw shown when the knife-lifting assembly is in the released position;

[0025] Figure 9 is Figure 7 a perspective view of the partial structure shown;

[0026] Figure 10 is Figure 1 a top view of the partial structure in the reciprocating saw shown;

[0027] Figure 11 is Figure 1 an exploded view of the partial structure in the reciprocating saw shown;

[0028] Figure 12 is Figure 1 a top view of the balance weight in the reciprocating saw shown;

[0029] Figure 13 is Figure 1 a plan view of the partial structure in the reciprocating saw shown;

[0030] Figure 14 is Figure 11 a sectional view of the partial structure in the reciprocating saw shown;

[0031] Figure 15 is Figure 1 an exploded view of the partial structure in the reciprocating saw shown;

[0032] Figure 16 is Figure 15 another view of the exploded view of the partial structure in the reciprocating saw shown;

[0033] Figure 17 is Figure 1 a plan view of the drainage assembly in the reciprocating saw shown;

[0034] Figure 18 is Figure 1 a perspective view of the drainage assembly in the reciprocating saw shown;

[0035] Figure 19 is a plan view of another embodiment of the power assembly in the present invention;

[0036] Figure 20 is Figure 19 a sectional view of the structure along the A-A direction in Detailed Embodiment

[0037] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0038] For the sake of clearly explaining the technical solution of the present application, the up, down, front, back, left and right are defined as shown in Figure 1 the figure.

[0039] As shown in Figure 1As shown in the figure, a cutting tool of the present invention is specifically an electric cutting tool. In the embodiment of the present application, a reciprocating saw 100 is taken as an example for detailed description.

[0040] As Figures 1 to 5 shown, a reciprocating saw 100 includes: a housing 10, a power assembly 20, a reciprocating assembly 31, a transmission assembly 32, a shock-absorbing assembly 33 and a swing assembly 34, an energy device 40 and a cutting accessory. Among them, the power assembly 20 is arranged in the housing 10 and is used to provide power for the reciprocating saw 100. The power assembly 20 includes a motor 21. The motor 21 includes a motor shaft 211 that can rotate around a first rotation axis 101 and a stator 212 for generating a magnetic field. The energy device 40 is installed on the housing 10 and is used to provide an energy source. In this embodiment, the energy device 40 is specifically a battery pack 41. Of course, the battery pack 41 and the housing 10 can be separately arranged, that is, the battery pack 41 is not directly installed on the surface of the housing 10. The housing 10 is fixedly connected or integrally formed with a first grip portion 11, a second grip portion 12 that can be grasped by the user, and a connecting portion 13 connecting the first grip portion 11 and the second grip portion 12. In the front-rear direction, the first grip portion 11 is arranged adjacent to the cutting accessory, and the second grip portion 12 is arranged at the rear side of the reciprocating saw 100. The second grip portion 12 is a handle. The transmission assembly 32 is arranged in the connection 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 the cutting accessory. In this embodiment, the cutting accessory is specifically a saw blade 50. The shock-absorbing assembly 33 moves in a direction substantially opposite to that of the reciprocating assembly 31 during the operation of the reciprocating saw 100 to balance the reciprocating motion of the reciprocating assembly 31. The shock-absorbing assembly 33 includes a balance weight 331. The swing assembly 34 is arranged adjacent to the reciprocating assembly 31 and can provide a supporting force different from the motion direction of the reciprocating assembly 31 to the reciprocating assembly 31, so that the reciprocating assembly 31 can rotate around a second axis 104. In this embodiment, the transmission assembly 32, the shock-absorbing assembly 33 and the swing assembly 34 are all arranged in the accommodating cavity of the gearbox 14.

[0041] Please refer to Figures 4 to 7, specifically, the reciprocating assembly 31 includes a reciprocating member 311 disposed generally along its own axis. When the reciprocating member 311 is driven by the motor shaft 211, it can reciprocate along its own axis relative to the housing 10. An output unit may be provided at the end of the reciprocating member 311 for connecting to the saw blade 50. The transmission assembly 32 includes a first transmission member 321 that can be driven by the motor 21 to rotate about the first axis 102, a rotating member 322 fixedly connected to the upper side of the first transmission member 321, and an eccentric member 323 connected to the rotating member 322 and capable of being driven by the rotating member 322 to rotate. The eccentric member 323 cooperates with the guide groove 316 of the reciprocating member. The eccentric member 323 can slide within the guide groove 316. The length of the eccentric member 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 member 323 is driven to rotate to achieve the reciprocating motion of the reciprocating member 311. Further, the surface of the eccentric member 323 is spherical, so configured to enable the third transmission member 323 to better cooperate with the guide groove of the reciprocating member 311 when rotating. The swing assembly 34 includes a floating support member 341 disposed between the first transmission member 321 and the reciprocating member 311. The floating support member 341 is used to achieve the transmission connection between the reciprocating member 311 and the first transmission member 321. The first transmission member 321 includes a cam surface 3211. The floating support member 341 can enable the transmission between the cam surface 3211 and the reciprocating member 311, that is, the cam surface 3211 can drive the floating support member 341 to perform a floating motion in the up-down direction. That is to say, the cam surface 3211 can drive the reciprocating member 311 to rotate back and forth along the second axis 104. It should be noted here that the floating motion means that the cam surface 3211 drives the floating support member 341 to perform a reciprocating motion in the up-down direction. That is, when the cam surface 3211 applies a supporting force to the floating support member 341, at this time, while the floating support member 341 is forced to rotate along its own axis, it can also move back and forth in the up-down direction. In addition to this, the floating motion can also be interpreted as that the cam surface 3211 drives the floating support member 341 to perform a reciprocating motion in a direction inclined and intersecting with the first axis 101.

[0042] In the up and down direction, the balance weight 331 is arranged between the reciprocating member 311 and the first transmission member 321. The balance weight 331 is provided with an avoidance opening 3311 allowing the floating support member 341 to extend into it. That is to say, the projections of the balance weight 331 and the floating support member 341 on the plane where the first axis 102 is located at least partially overlap. In this way, the size of the connecting portion 13 of the reciprocating saw 100 in the up and down direction can be made reasonable. By adopting the cam surface 3211 of the first transmission member 321 as the lifting knife inclined surface for cooperation with the floating support member 341 to achieve the knife lifting structure, such a setting can make full use of the upper space of the first transmission member 321, make the structure of the whole machine more compact, and further reduce the size of the floating support member 341 in the up and down direction. Moreover, while ensuring the reduction of the size of the reciprocating saw 100 in the up and down direction, it can also avoid the increase of the size of the reciprocating saw 100 in the front and back directions. Further, it can also avoid the situation where when using other methods to achieve knife lifting, other parts need to be set to drive the reciprocating member 311 and the balance weight 331, resulting in an overly complex structure. That is, the above setting greatly simplifies the structure. It should be noted that in this application, the first axis 102 extends basically in the up and down direction.

[0043] Please refer to Figures 6 to 9, the swing assembly 34 is disposed on the upper side of 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 member of the reciprocating saw 100, and the swing assembly 34 is connected to the sleeve 312. The floating support member 341 can move between a support position and a release position. Specifically, when the floating support member 341 is in the release position, the cam surface 3211 is separated from the floating support member 341. Here, "separated" means that the cam surface 3211 is not in contact with the floating support member 341, or it can also 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 support position, the cam surface 3211 is in contact with the floating support member 341. It should be noted here that when the floating support member 341 is in the support position, the upward blade lifting amount of the reciprocating saw 100 is the largest, that is, the first transmission member 321 is always in contact with the floating support member 341 during rotation. When the floating support member 341 is in the release position, that is, the reciprocating moving member 311 is only driven by the slider during movement. At this time, there is no supporting force between the first transmission member 321 and the floating support member 341 during the rotation of the first transmission member 321. The swing assembly 34 further includes an operating handle 342 and a blade lifting bracket 343. The operating handle 342 is used to operate the floating support member 341 to move between the support position and the release position. The operating handle 342 is specifically mounted on the gear box 14. The floating support member 341 is rotatably connected to the blade lifting bracket 343. When the blade lifting bracket 343 moves, the floating support member 341 moves accordingly. The blade lifting bracket 343 is fixedly connected to the reciprocating moving member 311. The operating handle 342 extends along the first straight line 103, and the operating handle 342 can rotate around the position of the first straight line 103. During the rotation of the operating handle 342, it can drive the sleeve 312 on the reciprocating moving member 311, so that the floating support member 341 is in the support position and the release position. In this embodiment, the operating handle 342 is specifically a cylinder. The operating handle 342 is provided with a groove surface 3421 and an arc surface 3422. When the floating support member 341 is in the support position, the groove surface 3421 is in contact with the sleeve 312. When the floating support member 341 is in the release position, the arc surface 3422 is in contact with the sleeve 312. For the convenience of description, the support position is defined as the initial position of the floating support member 341 here. Specifically, when the operating handle 342 rotates around the first straight line 103 in the first direction T from the initial position, the operating handle 342 drives the sleeve to move upward, thereby driving the blade lifting bracket 343 away from the cam surface 3211; when the operating handle 342 rotates around the first straight line 103 in the second direction F from the release position, the operating handle 342 drives the sleeve to move downward, thereby driving the bracket to approach the cam surface 3211.It can be seen from this that during the rotation of the operating handle 342, there are multiple intermediate positions that can be maintained. 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 part of the cam surface 3211 contacts the floating support 341. That is, when the first transmission member 321 rotates, only part of the cam surface 3211 can exert a supporting force on the floating support 341. The larger the angle by which the operating handle 342 rotates in the first direction T, the smaller the area that generates a driving force on the floating support 341, that is, the smaller the tool lifting amount. Conversely, the larger the tool lifting amount. As an implementation manner, 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, so as to realize tool lifting, and further make the floating support 341 reciprocate substantially along the direction of the first axis 101. As another implementation manner, a protrusion is fixedly connected 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, that is, the projection of the protrusion on the plane perpendicular to the first axis is irregular. At this time, the floating support adapted to the cam surface can be arranged along a direction that intersects the first axis obliquely, so as to realize tool lifting, and further make the floating support reciprocate along a direction that intersects the first axis obliquely. Such a setting can make the structure more compact.

[0044] In the front-back direction, the swing assembly 34 is arranged between the eccentric member and the handle. That is to say, the swing assembly 34 is arranged at the rear end of the reciprocating assembly 31. That is, the tool lifting bracket 343 is fixedly installed on the sleeve 312 at the rear end of the reciprocating member 311, and the floating support 341 is adjacent to the rear end of the reciprocating member 311. Such a setting can avoid that when the swing assembly 34 is arranged on the front side of the eccentric member, the opening of the avoidance port 3311 on the balance weight 331 that allows the floating support 341 to extend in is too large, resulting in insufficient structural strength of the balance weight 331, and further causing the balance weight 331 to be damaged due to vibration during the operation of the reciprocating saw 100, affecting the use of the machine. Of course, the tool lifting bracket 343 can also be installed on other components at the rear end of the reciprocating assembly 31, as long as tool lifting can be achieved, and it is not limited to where it is specifically installed. Further, the avoidance 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. Among them, W1 is greater than W2, that is, the avoidance port 3311 has enough width to allow the floating support 341 to move.

[0045] Please refer to Figures 2 to 3, the reciprocating saw 100 further includes a support base assembly 60, at least partially disposed within the housing 10. The support base assembly 60 includes a support base 61, and the support base 61 is mounted on the housing 10. There is at least one mounting position on the housing 10 for mounting the support base 61. It should be noted that when the support base 61 is fixedly connected to the housing 10, the mounting position refers to the position of the fixed connection between the support base 61 and the housing 10; when the support base 61 is slidably connected to the housing 10, the mounting position refers to the position of the adjustment assembly for adjusting the distance that the support base 61 extends out of the housing 10. In this embodiment, the support base 61 is slidably connected to the housing 10, and the adjustment button is used to adjust the position of the support base 61. The mounting position is provided at the first gripping portion 11. The housing 10 at the mounting position has a first distance L1 in the direction of the first axis 102. The housing 10 at the floating support member 341 has a third distance L3 in the direction of the first axis 102. Among them, 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 setting it in this way, the size of the connecting portion 13 of the reciprocating saw 100 in the up and down direction is within a relatively reasonable range. In some special working conditions, for example, when the workpiece to be cut is in some narrow positions, when the user holds the first gripping portion 11 to cut the workpiece at this time, it often causes the saw to be unable to work. At this time, the user will hold the connecting portion 13 with one hand and the second gripping portion 12 with the other hand to control the reciprocating saw 100. By setting the ratio of the distance in the up and down direction of the connecting portion 13 to the distance in the up and down direction of the first gripping portion 11 within the above range, there is enough space for the connecting portion 13 to arrange the transmission assembly 32, the reciprocating assembly 31, etc., so that the overall structure layout of the machine is more reasonable. Further, 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, the effect is better.

[0046] 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 engagement surface 3212 disposed opposite to the cam surface 3211, that is, the cam surface 3211 is disposed on the upper side of the engagement surface 3212. It can be understood that the positioning bearing 324 is located on the lower side of the engagement surface 3212. In order to better position the first transmission member 321 and ensure the structural strength, two positioning bearings 324 are provided in the transmission assembly 32. In this embodiment, the two positioning bearings 324 are adjacently disposed, that is, at least part of the positioning bearings 324 are in contact with each other. The housing 10 at the axis of the positioning bearing 324 has a second distance L2 in the direction of the first axis 102. Among them, 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 such setting, on the premise of ensuring the structural strength of the transmission assembly 32, the size of the connecting portion 13 in the up and down direction can be effectively reduced, facilitating the user to hold the connecting portion 13. It should be noted that in this embodiment, the sizes of L3 and L2 are substantially the same. Under the condition of ensuring the structural strength, there may also be only one or multiple positioning bearings 324. Further, 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, the effect is better.

[0047] Please refer to Figure 3 , Figures 10 to 12, the balance weight 331 is disposed between the cam surface 3211 and the reciprocating member 311. When the reciprocating saw 100 is operating, the balance weight 331 can move in a direction opposite to that of the reciprocating member 311 to balance the reciprocating motion of the reciprocating member 311. In this embodiment, the balance weight 331 is disposed within the gearbox 14 and can slide within the gearbox 14, and the balance weight 331 is substantially fitted to the gearbox 14. Specifically, the balance weight 331 includes a first section 3312, a connecting section 3313, and a second section 3314. The connecting section 3313 is used to connect the first section 3312 and the second section 3314. The first section 3312 is disposed on the front side of the connecting section 3313, that is, the first section 3312 is adjacent to the saw blade 50. Specifically, the first section 3312 is slender and is located within the first gripping portion 11. The second section 3314 is adjacent to the floating support member 341, that is, the second section 3314 is disposed within the connecting portion 13. The edge of the connecting section 3313 is irregular and is substantially fitted to the interior of the gearbox 14. A slider 3316 is connected to the gearbox 14, and a sliding groove 3315 that cooperates with the slider 3316 is formed on the balance weight 331. Specifically, the sliding groove 3315 is formed on the second section 3314 and cooperates with the slider 3316 fixedly connected to the gearbox 14, so that the balance weight 331 can slide relative to the gearbox 14. To ensure stability, a plurality of sliding grooves 3315 are provided on the balance weight 331. Of course, the sliding groove and the slider are disposed at opposite positions, that is to say, the balance weight is provided with the slider, and the gearbox is provided with the sliding groove.

[0048] The first section 3312 has a first length D1 in the direction along the first straight line 103, and the second section 3314 has a second length D2 in the direction along the first straight line 103, where the ratio range 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. Such a setting enables the first section 3312 to make full use of the space within the first gripping portion 11, making the overall arrangement of the machine more reasonable.

[0049] The ratio range of the volume of the first section 3312 to the volume of the balance weight 331 is greater than or equal to 0.05 and less than or equal to 0.35. According to the mass calculation formula, when the density remains unchanged, volume is proportional to weight, that is, the larger the volume, the greater the weight. That is to say, the above range also reflects the ratio range of the weight of the first section 3312 in the first gripping portion 11 to the overall weight of the balance weight 331. In this way, we can also understand that the ratio range of the weight of the balance weight 331 extending into the first gripping portion 11 to the weight of the entire balance weight 331 is within a relatively reasonable range. Such a setting makes full use of the space within the first gripping portion 11, so that there is sufficient space within the connecting portion 13 to arrange structures such as the swing assembly 34. When the first section 3312 is arranged within the connecting portion 13, or when the weight of the first section 3312 within the first gripping portion 11 accounts for too low a proportion of the overall weight of the balance weight 331, in order to ensure the reciprocating movement of the reciprocating member 311, it is inevitable to increase the dimension of the second section 3314 in the length direction, thereby increasing the dimension of the whole machine in the length direction and making the reciprocating saw 100 too long in the length direction, which is not conducive to user operation. When the weight of the first section 3312 within the first gripping portion 11 accounts for too high a proportion of the overall weight of the balance weight 331, it is inevitable that the volume of the first section 3312 within the first gripping portion 11 becomes larger, which will cause the dimension of the first section 3312 in the up and down direction to become larger, and further make the reciprocating saw 100 too long in the up and down direction, which is not conducive to user gripping. Further, when the ratio range of the volume of the first section to the volume of the balance weight is greater than or equal to 0.1 and less than or equal to 0.3, the effect is better.

[0050] Please refer to Figure 1 、 Figure 3 、 Figures 13 to 16, the power assembly 20 further includes: a barrel 25, a cooling fan 22, a cover plate 23, and a flow guiding assembly 24. The barrel 25 is sleeved on the circumference of the motor 21, and at least part of the motor 21 is disposed within the barrel 25. The cooling fan 22 is used to generate a cooling air flow, and the cooling fan 22 can be driven by the motor shaft 211 to rotate about the axis. The cover plate 23 is disposed between the cooling fan 22 and the stator 212. The cover plate 23 includes a central hole 231 that allows the motor shaft 211 and the cooling air flow to pass through, a rear side surface 233 adjacent to the stator 212, and a front side surface 232 that is away from the stator 212 relative to the rear side surface 233. At least part of the flow guiding assembly 24 is disposed on the outer circumference of the cover plate 23. The flow guiding assembly 24 is configured to restrict the cooling air flow from moving around the outer circumference of the cover plate 23. That is to say, the flow guiding assembly 24 cooperates with the cover plate 23 to prevent the cooling air flow from swirling back to the rear side surface 233. It can also be that the flow guiding assembly 24 cooperates with the cover plate 23 to prevent the cooling air flow from discharging from the outer periphery of the cover plate 23 and not discharging from the central hole 231 of the cover plate 23. Specifically, the cooling fan 22 is disposed in front of the stator 212. The cooling fan 22 is mounted on the motor shaft 211 and rotates synchronously with the motor shaft 211. On the housing 10, at the circumferential position of the flow guiding assembly 24, an air outlet 110 is provided for the cooling air flow to discharge. Behind the motor 21, specifically on the housing 10 behind the PCB board, an air inlet 120 is formed for the cooling air flow to enter. When the user drives the motor 21 to rotate, the bevel gear fixedly connected or integrally formed on the motor shaft 211 meshes with the meshing surface 3212 of the first transmission member 321, and the rotational motion of the motor 21 is transmitted to the first transmission member 321. When the motor 21 rotates, the cooling fan 22 is driven to rotate. The cooling air flow enters from the air inlet 120, flows through the PCB board, then enters the stator 212, and then passes through the central hole 231 of the cover plate 23. Part of the cooling air flow will be guided by the flow guiding assembly 24 and discharged from the air outlet 110 on the housing 10 at the circumference of the cooling fan 22. Part of the cooling air flow will continue to flow forward to the gearbox 14 to dissipate heat from the gearbox 14, and finally flow out from the front end opening of the housing 10. During the rotation of the cooling fan 22, a high-pressure area and a low-pressure area will be formed in the area corresponding to the front side surface 232 and the rear side surface 233. That is, the cooling air flow will be sucked in from the low-pressure area and then enter the high-pressure area. Through the cooperation of the flow guiding assembly 24 and the cover plate 23, when the cooling air flow in the low-pressure area corresponding to the rear side surface 233 of the cooling fan 22 flows into the high-pressure area corresponding to the front side surface 232, part of the air flow will be sucked into the low-pressure area corresponding to the rear side surface 233 again, thereby generating a swirling air flow, causing air flow disorder, and enabling the hot air flow in the high-pressure area to enter the low-pressure area, affecting heat dissipation. That is, the above setting can better plan the flow path of the cooling air flow and improve the cooling efficiency. In this application, the cooling fan 22 is specifically a centrifugal fan.

[0051] The drainage component 24 is arranged inside the casing 10. The drainage component 24 and the cover plate 23 can rotate relative to each other. An opening through which the motor 21 can pass is formed in the drainage component 24. Specifically, the opening is generally circular. Of course, it can be other shapes, such as a regular polygon, etc., which is not limited herein. In this application, it is preferably circular. By providing the opening in the drainage component 24, it is convenient to install the motor 21. The drainage component 24 is arranged around the cooling fan 22, that is to say, the size of the opening of the drainage component 24 is larger than the outer diameter of the motor 21.

[0052] Such as Figures 13 to 20As shown, the inner wall of the drainage component 24 has an inner diameter A1 in the direction perpendicular to the first rotation axis 101; the outer periphery of the cover plate 23 has an outer diameter B1 in 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. As an implementation manner, the drainage component 24 does not contact the cover plate 23, and the projected parts of the drainage component 24 and the cover plate 23 on the plane perpendicular to the first rotation axis 101 overlap, that is to say, the drainage component 24 is arranged outside the cover plate 23 and overlaps with the radial part of the cover plate 23, that is, a labyrinth structure is formed between the cover plate 23 and the drainage component 24, or perhaps 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 or integrally formed with the barrel 25, or the drainage component 24 is fixedly connected to or integrally formed with the housing 10. The cover plate 23 is fixedly connected to the cooling fan 22, that is, the drainage component 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 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 synchronous rotation. The cover plate 23 further includes an extension part 234 extending backward in a straight line direction, wherein the straight line direction is parallel to or obliquely intersects with the first rotation axis 101, which is not limited herein. In this application, the case where the straight line direction is parallel to the first rotation axis direction 101 is taken as an example for illustration, but any limitation on the extension part 234 in the following text also applies to the case where the straight line direction obliquely intersects with the first rotation axis 101. The drainage component 24 is provided with an inner ring 241 extending radially inward, and the inner ring 241 is provided with an opening through which the motor 21 can pass. The inner wall of the inner ring 241 has an inner diameter A2 in the direction perpendicular to the first rotation axis 101, and the extension part 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 to say, the ratio of the outer diameter of the extension part 234 to the inner diameter of the inner ring 241 is greater than or equal to 1.02 and less than or equal to 1.2. Such a setting can not only ensure that there is enough space between the cover plate 23 and the drainage component 24 to enable the cover plate 23 to rotate relative to the drainage component 24, but also prevent the cooling air flow from swirling back to the low-pressure area and avoid the generation of air flow disorder. It should be noted that the inner diameter A2 of the inner 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 part 234 to the inner diameter of the inner 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 manner, such as Figures 19 to 20As shown, the drainage component 24a does not contact the cover plate 23a. The ring 241a of the drainage component 24a is arranged adjacent to the cover plate 23a. At least part of the ring 241a overlaps the cover plate 23a axially. At the same time, the outer periphery of the ring 241a does not overlap the cover plate 23a radially. In this embodiment, the ratio range 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 such a setting, the effects of the above-mentioned embodiment can be basically achieved, that is, the drainage component 24a is arranged to cooperate with the cover plate 23a to block at least 90% of the cooling air flow from entering the second area from the first area. Of course, there can also be no ring. The inner diameter of the drainage component is greater than the outer diameter of the cover plate, and the ratio range of the inner diameter of the drainage component to the outer diameter of the cover plate is greater than or equal to 1 and less than or equal to 1.2.

[0053] The drainage component 24 is provided with several stop portions 242 in the circumferential direction. The stop portions 242 are fixedly connected or integrally formed with the drainage component 24. Several stop ribs 243 are arranged at intervals on the stop portions 242. The stop ribs 243 are arranged in the circumferential direction of the cooling fan 22. The stop ribs 243 at least partially overlap the blades of the cooling fan 22 axially along the first rotation axis. Thus, the flow direction of the cooling air flow can be guided well. The stop portions 242 are arranged at the air outlet 110. Specifically, guide channels are formed between the stop ribs 243. The guide channels basically correspond to the blades of the cooling fan 22 and are used to guide the cooling air flow output by the cooling fan 22. That is, through the above settings, the cooling air flow can be better discharged from the air outlet 110. At the same time, it can also prevent users from directly contacting the cooling fan 22, thereby protecting the cooling fan 22 and ensuring the normal operation of the reciprocating saw 100. In order to better guide the cooling air flow, the edge surface of the stop rib 243 is configured to be inclined to guide to the motor shaft 211. Through the above settings, the cooling air flow can be guided to flow obliquely downward, avoiding the cooling air flow from blowing on the user, especially avoiding blowing into the user's eyes and causing safety accidents. In this application, the distance H between the edge surfaces of two adjacent stop ribs 243 is less than or equal to 15 mm. By setting the gap of the stop ribs 243 within the above range, it can effectively prevent the user's fingers from reaching deep into the cooling fan 22 and affecting the operation of the cooling fan 22.

[0054] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the above embodiments do not limit the present invention in any form. Any technical solutions obtained by using equivalent replacements or equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A cutting tool, comprising: A housing; And disposed within the housing: A power assembly for providing power; A transmission assembly connected to the power assembly; A reciprocating assembly connected to the transmission assembly, the reciprocating assembly being configured to reciprocate along the axis of the fuselage, and the reciprocating assembly includes an output unit capable of mounting a cutting accessory; A swing assembly disposed between the transmission assembly and the reciprocating assembly; A balance weight, at least partially disposed between the transmission assembly and the reciprocating assembly and for balancing the movement of the reciprocating assembly; Characterized in that: The transmission assembly includes: A first transmission member capable of being driven by the power assembly to rotate about a first axis, and in the direction along the first axis, the first transmission member includes a cam surface disposed at its end; The swing assembly includes: a floating support member, drivingly connected to the reciprocating assembly and the cam surface, and capable of being driven by the cam surface to reciprocate up and down; The balance weight includes: an avoidance opening disposed on the reciprocating movement path of the floating support member; The first axis extends substantially in the up and down direction.

2. The cutting tool according to claim 1, characterized in that: The power assembly includes a motor, and the motor includes a motor shaft capable of rotating about a first rotation axis; The first transmission member further includes: an engagement surface disposed opposite to the cam surface, and the engagement surface engages with the end of the motor shaft.

3. The cutting tool according to claim 2, characterized in that: The transmission assembly further includes: A rotating member connected to the first transmission member and rotating coaxially therewith; An eccentric member connected to the rotating member and eccentrically disposed with respect to the axis of the rotating member, and the eccentric member is slidably connected to the reciprocating assembly.

4. The cutting tool according to claim 2, characterized in that: The transmission assembly further includes a positioning assembly for positioning the first transmission member, and in the direction along the first axis, the positioning assembly is disposed on the lower side of the engagement surface away from the reciprocating assembly; The positioning assembly includes at least one positioning bearing.

5. The cutting tool according to claim 4, characterized in that: The housing includes a first grip portion and a second grip portion disposed front and rear, the first grip portion is disposed near the cutting accessory, and the second grip portion is disposed at the rear side of the housing; The cutting tool further includes: A support seat assembly mounted to the housing; The support seat assembly includes a support seat, the support seat is mounted on the housing, and there is at least one mounting position on the housing for mounting the support seat; the housing at the mounting position has a first distance L1 in the direction along the first axis; The housing at the axis of the positioning bearing has a second distance L2 in the direction along the first axis; Wherein 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.

6. The cutting tool according to claim 1, characterized in that: The housing includes a first gripping portion disposed adjacent to the cutting attachment. The oscillating assembly further includes an operating handle extending substantially along a first straight line. The balance weight includes a first section, a connecting section, and a second section arranged front to back. The connecting section connects the first section and the second section. The first section extends forward into the first gripping portion. An avoidance opening is provided in the second section. Wherein the first section has a first length D1 in the direction of the first straight line, and the second section has a second length D2 in the direction of the first straight line. The ratio range 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.

7. The cutting tool according to claim 6, wherein: The ratio range of the volume of the first section to the volume of the balance weight is greater than or equal to 0.05 and less than or equal to 0.

35.

8. The cutting tool according to claim 1, wherein: The avoidance opening has a width W1 in the left - right direction perpendicular to the up - down direction, and the floating support has a diameter W2 in the left - right direction perpendicular to the up - down direction. Wherein, W1 is greater than W2.

9. The cutting tool according to claim 6, wherein: A sliding groove is formed on the balance weight for guiding the movement of the balance weight; A sliding member cooperating with the sliding groove is installed in the housing.

10. A cutting tool, comprising: A housing; And disposed within the housing: A power assembly for providing power; A transmission assembly connected to the power assembly; A reciprocating assembly connected to the transmission assembly. The reciprocating assembly is configured to reciprocate along the axis of the body. The reciprocating assembly includes an output unit for mounting an attachment; An oscillating assembly disposed between the transmission assembly and the reciprocating assembly; A balance weight, at least partially disposed between the transmission assembly and the reciprocating assembly and for balancing the reciprocating assembly; Wherein: The transmission assembly includes: A first transmission member that can be driven by the power assembly to rotate about a first axis. In the direction of the first axis, the first transmission member includes a cam surface disposed at an end; The oscillating assembly includes: a floating support connected to the reciprocating assembly and capable of being driven by the cam surface to perform a floating movement in a direction intersecting the first axis obliquely; The balance weight includes: an avoidance opening, which is provided to allow the floating support to be driven by the cam surface to perform a floating movement in a direction intersecting the first axis obliquely.

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