Circular Saw

Abstract

The invention discloses an electric circular saw, comprising: a main machine; a battery pack; the main machine comprises: a saw blade, which can rotate around a first rotation axis; a housing, which is surrounded by a receiving cavity, and the housing comprises a main handle; a motor; a transmission assembly; a battery pack assembly, which is mounted on the housing; the battery pack assembly comprises a first battery pack mounted on the housing along a first straight line direction and a second battery pack mounted on the housing along a second straight line direction, and in the forward direction of the electric circular saw, a first distance a1 from the second end of the first battery pack to the first axis is less than the sum of a second distance a2 from the first end of the first battery pack to the first axis along the first straight line direction and a distance c1 of the first battery pack in its length direction. And a third distance a3 from the fourth end of the second battery pack to the first axis is less than the sum of a fourth distance a4 from the third end of the second battery pack to the first axis along the second straight line direction and a distance c2 of the second battery pack in its length direction. The electric circular saw runs smoothly and has a reasonable structure.

Description

Technical Field

[0001] The invention relates to a cutting tool, in particular to an electric circular saw. Background Art

[0002] Electric circular saw is a tool that uses a single-phase series-excited motor as power and then drives the circular saw blade through a transmission mechanism to perform sawing operations. Electric circular saws are classified according to the type of power supply. Electric circular saws are mainly divided into DC circular saws and AC circular saws. DC circular saws are popular among users because of their safety, reliability, high work efficiency, and convenience to carry.

[0003] However, when using the DC power supply electric circular saws currently on the market, the motor is usually arranged on one side of the circular saw blade, so that the center of gravity of the electric circular saw is located on one side of the saw blade. Therefore, during the operation of the electric circular saw, the user needs to exert more force to prevent the electric circular saw from twisting, which makes the operation of the electric circular saw too laborious and difficult to control. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, an object of the present invention is to provide an electric circular saw which has a compact structure, is easy for users to operate and runs smoothly.

[0005] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: an electric circular saw, comprising: a housing, which is surrounded by a receiving cavity; a motor, which comprises a motor shaft that can rotate around a first axis, and the motor is at least partially arranged in the receiving cavity; a transmission assembly, which comprises a first transmission member connected to the motor to introduce power into the transmission assembly and a second transmission member for outputting power, and the second transmission member can rotate around the first rotation axis; the motor shaft has a first end and a second end that are oppositely arranged in the length direction thereof, and the first transmission member is installed to the second end of the motor shaft;

[0006] A coordinate system is established with the center of the second transmission member as the origin, with the forward direction of the electric circular saw as the positive direction of the X-axis, and the upper side of the electric circular saw as the positive direction of the Y-axis; the first axis and the positive direction of the Y-axis of the coordinate system are obliquely intersected to form an angle a, and the angle a has an angle range greater than 0 degrees and less than 90 degrees;

[0007] Further, the second end of the motor shaft is arranged in the first quadrant of the coordinate system.

[0008] Further, the first transmission member is arranged in the first quadrant of the coordinate system.

[0009] Further, the first end of the motor shaft is arranged in the second quadrant of the coordinate system.

[0010] Further, the first end of the motor shaft is arranged on the upper side of the second end.

[0011] Furthermore, the electric circular saw has a cutting plane, which is the extended plane of the saw blade when the saw blade is installed on the electric circular saw; the line connecting the first end of the motor shaft and the center of the second transmission member is projected on the cutting plane as a first projection line, and an angle b formed by the oblique intersection of the first projection line and the Y-axis is greater than 0 degrees and equal to and less than or equal to 30 degrees.

[0012] Furthermore, the orthographic projection of a line connecting the second end of the motor shaft and the center of the second transmission member on the cutting plane is a second projection line, and an angle c formed by the oblique intersection of the second projection line and the Y-axis is greater than 0 degrees and equal to and less than or equal to 60 degrees.

[0013] Furthermore, the orthographic projection of a line connecting the second end of the motor shaft and the center of the second transmission member on the cutting plane is a second projection line, and an angle d formed by the intersection of the second projection line and the first projection line is greater than or equal to 0 degrees and greater than or equal to 90 degrees.

[0014] Furthermore, the housing also includes: a main handle for the user to hold; a switch assembly installed on the main handle; a motor housing portion that surrounds the motor; a mounting portion that is used to detachably install the battery pack; and the mounting portion is configured to connect the motor housing portion and the main handle.

[0015] Furthermore, the electric circular saw also includes a saw blade for cutting a workpiece; the distance between the first end of the motor shaft and the saw blade is smaller than the sum of the distance between the second end of the motor shaft and the saw blade and the length of the motor shaft.

[0016] Furthermore, the ratio of the sum of the distance from the first end of the motor shaft to the saw blade and the distance from the second end of the motor shaft to the saw blade and the length of the motor shaft is greater than or equal to 0.8.

[0017] Furthermore, the distance between the first end of the motor shaft and the saw blade is greater than or equal to 105 mm and less than or equal to 160 mm.

[0018] Furthermore, the electric circular saw also includes: a battery pack installed in the casing to provide an energy source for the motor; the first transmission member is configured to be able to rotate synchronously with the motor, and the second transmission member can be driven by the first transmission member to rotate around a first rotation axis, and the first rotation axis basically extends in the left-right direction; the direction of the first axis intersects with the direction of the left-right direction; in the up-down direction, the second end is located at the lower side of the first end, and the up-down direction is basically perpendicular to the left-right direction.

[0019] Furthermore, the electric circular saw also includes: a cutting attachment, which can be driven by a motor to rotate around a first rotation axis, and a cutting surface generated by the cutting attachment during cutting extends within a cutting plane, and the cutting attachment has a first side surface, and the first side surface is parallel to the cutting plane; the motor has a first end surface, and in the left and right directions, the first end surface is located on a side away from the cutting attachment; the first end surface to the first side surface has a first length L1 in a first direction parallel to the first axis direction; the first end surface to the first side surface has a second length L2 in a second direction parallel to the first rotation axis direction; wherein the ratio of the first length L1 to the second length L2 ranges from 1.02 to 1.1.

[0020] Furthermore, the first transmission member is fixedly connected to or integrally formed with the motor shaft; the first transmission member is meshed with the second transmission member.

[0021] Furthermore, a ratio of a rotational speed of the first transmission member when driven by the motor to a rotational speed of the second transmission member when driven by the first transmission member is a reduction ratio, and the reduction ratio is greater than or equal to 4 and less than or equal to 6.5.

[0022] Furthermore, the electric circular saw includes at least two battery packs.

[0023] The benefit of the present invention lies in that: by rationally arranging the position of the electric circular saw, especially optimizing the arrangement of structures such as the motor and the casing, the center of gravity of the electric circular saw is brought closer to the transmission assembly in the left-right direction. This arrangement can not only reduce the length of the electric circular saw in the left-right direction, but also reduce the force applied by the user to prevent the electric circular saw from twisting, thereby ensuring the smooth operation of the electric circular saw. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view of an electric circular saw according to a first embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A top view of the circular saw shown;

[0026] Figure 3 yes Figure 1 A top view of a partial structure of the electric circular saw shown;

[0027] Figure 4 yes Figure 1 A top view of a portion of the structure of the electric circular saw;

[0028] Figure 5 yes Figure 1 A partial front view of the electric circular saw;

[0029] Figure 6 yes Figure 1 A partial front view of the electric circular saw;

[0030] Figure 7 yes Figure 1 A top view of a portion of the structure of the electric circular saw;

[0031] Figure 8 yes Figure 1 A top view of a portion of the structure of the electric circular saw

[0032] Fig. 9 is a partial structural top view of an electric circular saw according to a second embodiment of the present invention;

[0033] Fig.10 is a schematic diagram of the installation position of the battery pack in the third embodiment of the present invention;

[0034] Fig.11 is a schematic diagram of the installation position of the battery pack in the fourth embodiment of the present invention;

[0035] Fig.12 yes Figure 6 A simplified schematic diagram of

[0036] Fig.13 is a three-dimensional diagram of the installation position of the battery pack in the fifth embodiment of the present invention;

[0037] Fig.14 yes Fig.13 a plan view of the circular saw shown;

[0038] Fig.15 yes Fig.13 A schematic diagram showing the electric circular saw body and the battery pack being separated;

[0039] Fig.16 yes Fig.13 A top view of the circular saw shown;

[0040] Fig.17 yes Fig.13 A schematic diagram of a partial structure of the electric circular saw shown;

[0041] Fig.18 yes Fig.13 A schematic diagram of the electric circular saw having a partially separated structure;

[0042] Fig.19 yes Fig.18 A schematic diagram of another viewing angle of the circular saw shown. DETAILED DESCRIPTION

[0043] In order to clearly explain the technical solution of this application, the following definitions are given: Figure 1 Up, down, front, back, left and right shown.

[0044] like Figures 1 to 4The electric circular saw 100 of the first embodiment shown is specifically a handheld electric circular saw, which includes: a housing 10, a motor 20, a battery pack 30, a transmission assembly 40, a cutting attachment 50, an output shaft 60 and a bottom plate 70. The housing 10 is formed with a receiving cavity. The motor 20 has a motor shaft 21 that can rotate around a first axis 101, and the motor 20 can drive the output shaft 60 to rotate around a first rotation axis 102, and the motor 20 is at least partially disposed in the receiving cavity. The battery pack 30 is mounted on the electric circular saw 100 to provide an energy source for the motor 20. The transmission assembly 40 is used to transmit the power output by the motor 20 to the output shaft 60, and the transmission assembly 40 includes a first transmission member 41 and a second transmission member 42. The first transmission member 41 is configured to be able to form a synchronous rotation with the motor shaft 21, the first transmission member 41 is used to introduce the power of the motor 20, and the second transmission member 42 is used to output the power. Specifically, the second transmission member 42 can be driven by the first transmission member 41 to rotate around the first rotation axis 102. The cutting attachment 50 is used to cut a workpiece, and specifically, the cutting attachment 50 is a saw blade 51. The bottom plate 70 is formed with a bottom plate plane 71 for contacting the workpiece. In the present application, the first rotation axis 102 extends substantially in the left-right direction.

[0045] In the present embodiment, the motor shaft 21 has a first end 22 and a second end 23 in the length direction thereof, and the second end 23 is used to output power to the transmission assembly 40, that is, the second end 23 is the output end of the motor shaft 21. The first transmission member 41 is mounted to the second end 23 of the motor shaft 21. Specifically, the first transmission member 41 is fixedly mounted to the second end 23, or the first transmission member and the second end 23 are integrally formed. In the left-right direction, the first end 22 is configured to be farther away from the cutting attachment 50 relative to the second end 23. In the up-down direction, the second end 23 is located at the lower side of the first end 22. In this way, the distance L2 from the first end 22 of the motor shaft 21 to the saw blade 51 in the direction along the first rotation axis 102 is less than the sum of the distance L3 from the second end 23 to the saw blade 51 in the direction along the first axis 101 and the length L of the motor shaft, that is:

[0046] ;

[0047] In this way, the size of the electric circular saw 100 in the left-right direction is small, making the whole machine structure compact, so that the electric circular saw 100 can work in some narrow spaces, which is convenient for users to operate, carry and store. In this way, the center of gravity G of the electric circular saw 100 can be closer to the saw blade 51, and the distance D between the center of gravity G and the saw blade 51 is reduced. If the distance D between the center of gravity G and the saw blade 51 is large, that is, the overturning moment of the electric circular saw 100 is large, so when the user cuts some narrow workpieces, if the user's grip force is small, it will be easy for the electric circular saw 100 to fall over. In order to prevent the electric circular saw 100 from falling over, the user needs to hold the electric circular saw 100 with greater force to make the electric circular saw 100 run smoothly. Through the above-mentioned setting, the center of gravity G is close to the saw blade 51, the overturning moment of the electric circular saw 100 is reduced, and the user is convenient to operate.

[0048] In this embodiment, the ratio of the sum of the distance L2 between the first end 22 of the motor shaft 21 and the saw blade 51 and the distance L3 between the second end 23 of the motor shaft 21 and the saw blade 51 and the length L of the motor shaft is greater than or equal to 0.8, that is:

[0049] ;

[0050] In this way, the size of the electric circular saw 100 in the left-right direction can be made more reasonable, the transmission assembly 40 is set as a gear assembly that occupies a small space to achieve power transmission, and there is a certain space between the motor 20 and the saw blade 51 to set the transmission assembly 40, so that the structural layout of the whole machine is more reasonable. Furthermore, while ensuring that the size of the electric circular saw 100 in the left-right direction is reduced, the size of the electric circular saw 100 in the front-back direction can also be avoided. In this way, the length and width of the electric circular saw 100 can be taken into account at the same time, so that the whole machine is set more compactly. Further, L2 is greater than or equal to 105 mm and less than or equal to 160 mm.

[0051] Further, the direction of the first axis 101 intersects the direction of the first rotation axis 102 at an angle. The angle e formed by the intersection of the direction of the first axis 101 and the direction of the first rotation axis 102 is an acute angle, and the angle e formed by the intersection of the direction of the first axis 101 and the direction of the first rotation axis 102 is greater than or equal to 10 degrees and less than or equal to 45 degrees. Further, the angle e formed by the intersection of the direction of the first axis 101 and the direction of the first rotation axis 102 is greater than or equal to 10 degrees and less than or equal to 35 degrees. Further, the angle e formed by the intersection of the direction of the first axis 101 and the direction of the first rotation axis 102 is greater than or equal to 10 degrees and less than or equal to 30 degrees. Further, the angle e formed by the intersection of the direction of the first axis 101 and the direction of the first rotation axis 102 is greater than or equal to 10 degrees and less than or equal to 20 degrees. Further, the angle e formed by the intersection of the direction of the first axis 101 and the direction of the first rotation axis 102 is greater than or equal to 12 degrees and less than 30 degrees. Further, the angle e formed by the intersection of the first axis 101 direction and the first rotation axis 102 direction is greater than or equal to 12 degrees and less than 25 degrees. Further, the angle e formed by the intersection of the first axis 101 direction and the first rotation axis 102 direction is greater than or equal to 12 degrees and less than or equal to 20 degrees. Further, the angle e formed by the intersection of the first axis 101 direction and the first rotation axis 102 direction is greater than or equal to 12 degrees and less than or equal to 18 degrees. Further, the angle e formed by the intersection of the first axis 101 direction and the first rotation axis 102 direction is greater than or equal to 15 degrees and less than or equal to 25 degrees. In this way, by setting the angle e formed by the intersection of the first axis 101 direction and the first rotation axis 102 direction within a certain range, the size of the electric circular saw 100 in the left-right direction is shortened, and at the same time, the size of the electric circular saw 100 in the front-back direction will not increase or increase less.

[0052] The electric circular saw 100 further includes a shield 80, and the cutting attachment 50 can be driven by the motor 20 to rotate around the second rotation axis. The second rotation axis is parallel to or coincides with the first rotation axis 102. The shield 80 partially surrounds the cutting attachment 50 in the circumferential direction of the second rotation axis to protect the user from injury. The shield 80 is installed on the electric circular saw 100, and the shield 80 includes a fixed shield and a dynamic shield. The fixed shield is fixed relative to the housing 10, and the dynamic shield can rotate relative to the fixed shield. The bottom plate 70 is used to support the electric circular saw 100. The fixed shield is arranged on the upper side of the bottom plate 70 and connected to the housing 10. The bottom plate 70 is also formed with an opening for the saw blade 51 to at least partially pass through, so that the saw blade 51 can extend to the lower side of the bottom plate plane 71. The bottom plate 70 has an angle plate 72, which is arranged on the front side of the bottom plate 70. The user can operate the angle plate 72 to make the bottom plate 70 rotate around the first rotation axis 104 to adjust the cutting angle of the electric circular saw 100. The bottom plate 70 also has a depth adjustment plate, which is disposed at the rear side of the bottom plate 70. The user can operate the depth adjustment plate to allow the bottom plate 70 to rotate relative to the housing 10 around the second rotation axis 105 to adjust the cutting depth of the electric circular saw 100. When the bottom plate 70 rotates around the second rotation axis 105, the bottom plate 70 has an initial position of maximum cutting depth relative to the housing 10, at which time the size of the portion of the saw blade 51 extending out of the bottom plate 70 is the largest, and the saw blade 51 is perpendicular to the bottom plate plane 71. In this embodiment, the first rotation axis 102 coincides with the second rotation axis.

[0053] The transmission assembly 40 is arranged in the gear box, and the gear box is fixedly connected to the shield 80. The first transmission member 41 is configured to be able to rotate in a direction parallel to or coincident with the direction of the first axis 101. The first transmission member 41 is fixedly connected or integrally formed with the motor shaft 21. As an embodiment, it can be understood that the first transmission member 41 and the motor shaft 21 can be directly fixed or indirectly fixed, that is, the first transmission member 41 and the motor shaft 21 can be directly fixed by means of interference fit or the like, or the first transmission member 41 and the motor shaft 21 can be indirectly fixed by means of an intermediate connecting member. In the present embodiment, the first transmission member 41 and the motor shaft 21 are integrally formed, that is, the first transmission member 41 is a part of the motor shaft 21. In summary, in the present application, the specific connection method between the first transmission member 41 and the motor shaft 21 is not limited, as long as the first transmission member 41 and the motor shaft 21 can be relatively fixed and can constitute synchronous rotation. The second transmission member 42 can be driven by the first transmission member 41, and rotate around the first rotation axis 102 to drive the saw blade 51 to rotate to achieve the cutting function. Specifically, the first transmission member 41 is a helical gear, and the helical gear is interference fit with the motor shaft 21. The second transmission member 42 is a helical gear, and the helical gear is fixedly connected to the output shaft 60. The helical gears are directly meshed, that is, the helical gear on the motor shaft 21 rotates to drive the helical gear connected to the output shaft 60 to rotate. The ratio of the speed of the helical gear when driven by the motor 20 to the speed of the helical gear fixedly connected to the output shaft 60 is the reduction ratio. In this embodiment, the reduction ratio of the transmission assembly 40 is greater than or equal to 4 and less than or equal to 6.5. Of course, we can also use a smaller bevel gear assembly to achieve transmission. Specifically, the first transmission member and the second transmission member are both bevel gears.

[0054] It should be noted here that the fixed connections mentioned in this application can be understood as the direct fixation or indirect fixation described above, unless otherwise specified.

[0055] For the convenience of explanation, Figure 5 , Figure 6 and Fig.12As shown, a coordinate system with the center of the second transmission member as the origin O is established, with the front-to-back direction as the X-axis direction, the direction pointing to the front side as the positive direction of the X-axis, the up-down direction as the Y-axis direction, and the direction pointing to the upper side as the positive direction of the Y-axis. In this embodiment, the first axis 101 is obliquely intersected with the positive direction of the Y-axis of the coordinate system to form an angle a, and the angle a has an angle range greater than 0 degrees and less than 90 degrees. The second end 23 of the motor shaft 21 is arranged in the first quadrant of the coordinate system, so that the first transmission member 41 is arranged in the first quadrant, in the front-to-back direction, the first transmission member 41 is arranged in front of the first rotation axis 102, and in the up-down direction, the first transmission member 41 is arranged on the upper side of the first rotation axis 102. The second end 23 of the motor shaft 21 is arranged at the front side of the first rotation axis 102, and the first transmission member 41 is arranged at the front side of the first transmission axis 102, so that the space at the front side of the first rotation axis 102 can be fully utilized, thereby not only saving the space of the rear half of the electric circular saw 100, but also avoiding the situation that the length of the electric circular saw 100 in the front-to-back direction is too long when the first transmission member 41 is arranged in the second quadrant or the third quadrant. The second end 23 of the motor shaft 21 is arranged at the upper side of the first rotation axis 102, so that the space at the upper side of the first rotation axis 102 can be fully utilized, and the space at the lower side of the first rotation axis 102 can be reduced or avoided to be occupied, so that the distance from the first rotation axis 102 to the bottom plate 70 can be reduced, that is, the distance from the center of the saw blade 51 to the bottom plate 70 can be reduced, thereby ensuring and increasing the maximum cutting depth of the electric circular saw 100, and avoiding the situation that the distance from the center of the saw blade 51 to the bottom plate 70 is increased due to the second end 23 of the motor shaft 21 being arranged in the third quadrant or the fourth quadrant. In fact, in this embodiment, the second end 23 of the motor shaft 21 is arranged on the upper side of the first rotation axis 102, so that when the distance between the first rotation axis 102 of the first transmission member 41 and the bottom plate 70 remains unchanged, there is enough space on the lower side of the motor 20 to allow a motor housing to wrap the motor 20 and the housing 10 to also wrap the motor 20 and the motor housing. Specifically, the housing 10 includes a motor housing portion 14 and a transmission housing portion 15. The transmission assembly 40 is arranged in the gear box, the gear box is fixedly connected to the shield 80, and the transmission housing portion 15 wraps the gear box. The motor 20 is arranged in the motor housing, and the motor housing portion 14 wraps the motor housing. Among them, the motor housing and the gear box are both made of metal materials, and the motor housing portion 14 and the transmission housing portion 15 are both made of plastic materials. In this way, because the second end 23 of the motor shaft 21 is arranged in the first quadrant of the coordinate system, the motor housing portion 14 and the transmission housing portion 15 only occupy a small space on the lower side of the first rotation axis 102, so that the maximum cutting depth of the electric circular saw 100 can be increased. Of course, from the perspective of cost, the motor housing can also be made of plastic.

[0056] The saw blade 51 is mounted on the output shaft 60 and rotates synchronously with the output shaft 60. The electric circular saw 100 has a cutting plane P, wherein the cutting plane P is an extension plane of the saw blade when the saw blade 51 is mounted on the electric circular saw 100. The first end 22 of the motor shaft 21 is displaced in the second quadrant, and the projection of the line connecting the first end 22 of the motor shaft 21 and the center of the second transmission member 42 on the cutting plane P is a first projection line 211, wherein the angle b formed by the first projection line 211 obliquely intersecting with the positive direction of the Y axis is greater than 0 degrees and equal to and less than or equal to 30 degrees. The rotor and stator of the motor 20 are arranged closer to the first end 22 than the second end 23, that is, in the up and down direction, the length of the motor 20 adjacent to the first end 22 is the largest. With this arrangement, the first end 22 of the motor 20 can be basically located on the upper side of the first rotation axis 102, that is, the motor 20 as a whole can be basically located above the first rotation axis 102, without occupying the position of the first rotation axis 102, thereby ensuring the cutting depth of the electric circular saw 100. The projection of the line connecting the second end 23 of the motor shaft 21 and the center of the second transmission member 42 on the cutting plane P is the second projection line 212. The second end 23 of the motor shaft 21 is located in the first quadrant, and the angle c formed by the oblique intersection of the second projection line 212 and the Y axis is greater than or equal to 0 degrees and less than or equal to 60 degrees. That is, the second end 23 of the motor shaft 21 is located on the upper side of the first rotation axis 102. By setting the second end 23 of the motor shaft 21 within the above range, the second end 23 of the motor shaft 21 is basically located in the upper space of the first rotation axis 102, avoiding the situation where the transmission housing part 15 and the motor housing part 14 occupy more lower space of the first rotation axis 102 due to the position of the second end 23 being on the lower side of the first rotation axis 102, thereby causing the bottom plate 70 to be set too low, thereby affecting the maximum cutting depth of the electric circular saw 100. Furthermore, the angle d formed by the intersection of the first projection line 211 and the second projection line 212 is greater than or equal to 0 degrees and less than or equal to 90 degrees. The above-mentioned arrangement enables the motor 20 to be basically located on the upper side of the first rotation axis 102, so that there is enough space on the lower side of the first rotation axis 102 to set the motor housing and the motor housing part 14, etc., to avoid the situation where the motor housing and the motor housing part 14 occupy too much space on the lower side of the first rotation axis 102, resulting in the base plate 70 having to be set downward, affecting the cutting depth of the electric circular saw 100.

[0057] like Figure 4 , Figure 7 and Figure 8As shown, the cutting plane P is perpendicular to the first rotation axis 102, and the cutting plane P is obliquely intersecting with the first axis 101. The cutting plane P of the electric circular saw 100 is obliquely intersecting with the first axis 101 of the motor shaft 21, wherein the angle f formed by the oblique intersection of the cutting plane P and the first axis 101 is greater than or equal to 100 degrees and less than or equal to 145 degrees. Further, the angle f formed by the oblique intersection of the cutting plane P and the first axis 101 is greater than or equal to 100 degrees and less than or equal to 125 degrees. Further, the angle f formed by the oblique intersection of the cutting plane P and the first axis 101 is greater than or equal to 100 degrees and less than or equal to 120 degrees. Further, the angle f formed by the oblique intersection of the cutting plane P and the first axis 101 is greater than or equal to 100 degrees and less than or equal to 110 degrees. Further, the angle f formed by the oblique intersection of the cutting plane P and the first axis 101 is greater than or equal to 102 degrees and less than or equal to 120 degrees. Further, the angle f formed by the oblique intersection of the cutting plane P and the first axis 101 is greater than or equal to 102 degrees and less than or equal to 115 degrees. Further, the angle f formed by the oblique intersection of the cutting plane P and the first axis 101 is greater than or equal to 102 degrees and less than or equal to 110 degrees. Further, the angle f formed by the oblique intersection of the cutting plane P and the first axis 101 is greater than or equal to 102 degrees and less than or equal to 108 degrees. In this embodiment, in the direction along the first axis 101, the inclined distance between the first end 22 of the motor shaft 21 and the saw blade 51 is L1. In the direction along the first rotation axis 102, the distance between the first end 22 of the motor shaft 21 and the saw blade 51 is L2, wherein the ratio of L1 to L2 is greater than or equal to 1.02 and less than or equal to 1.2. Further, the ratio of L1 to L2 is greater than or equal to 1.02 and less than or equal to 1.1.

[0058] The electric circular saw 100 further includes a shaft lock assembly 43, which is used to lock the rotation of the second transmission member 42. When the second transmission member 42 is locked, the user can easily remove or install the saw blade 51. The shaft lock assembly 43 is arranged adjacent to the large gear. In order to facilitate user operation, the shaft lock assembly 43 is at least partially located outside the housing 10 for user operation. Figure 3 and Figure 4As shown, the first end 22 of the motor 20 is at least partially arranged in the second quadrant of the coordinate system, that is, in the front-to-back direction, the first end 22 of the motor 20 is arranged behind the second end 23, or in other words, in the front-to-back direction, the distance between the first end 22 of the motor 20 and the angle plate 72 is greater than the distance between the second end 23 of the motor 20 and the angle plate 72, and the shaft lock assembly 43 is arranged in the first quadrant, which is located at the front side of the motor 20. Through the above arrangement, the motor 20 is tilted backward, so that there is enough space at the front side of the motor 20 for the user's hand to reach near the shaft lock assembly 34 to operate the shaft lock assembly 43, and the distance between the angle plate 72 and the housing 10 can be increased, so that the user can observe the cutting condition of the saw blade 51 from the right side of the electric circular saw. In the up-down direction, the first end 22 of the motor shaft 21 is also arranged on the upper side of the second end 23, so that it can further ensure that the housing 10 does not reduce the maximum cutting depth of the electric circular saw 100 while including the motor 20.

[0059] The electric circular saw 100 further includes a main handle 11 and an auxiliary handle 12, both of which are used for users to hold. The main handle 11 is fixedly connected to or integrally formed with the housing 10. In this embodiment, the housing 10 is formed with the main handle 11, that is, the main handle 11 is integrally formed with the housing 10, wherein the main handle 11 is provided with a switch assembly for prohibiting and allowing the battery pack 30 to provide energy to the motor 20. The housing 10 is connected to or formed with a mounting portion 13 for mounting the battery pack 30. In this embodiment, the mounting portion 13 is formed by the housing 10 itself, that is, the mounting portion 13 is integrally formed with the housing 10. In the front-to-back direction, the mounting portion 13 is arranged between the rear end of the main handle 11 and the motor 20, so that in the front-to-back direction, the battery pack 30 is arranged closer to the motor 20, so that the center of gravity G of the whole machine can be closer to the motor shaft 21 in the front-to-back direction. In this embodiment, in the front-to-back direction, the distance between the center of gravity G of the electric circular saw 100 when the battery pack 30 is installed and the center of the saw blade 51 is reduced, so that the force arm of the electric circular saw 100 that is twisted during operation can be reduced, and the torque of the electric circular saw 100 that is twisted can be reduced, thereby improving the stability of the electric circular saw 100 and improving the work efficiency of the user. The mounting portion 13 is surrounded by a receiving groove 131 with an opening that opens to the right, and the opening allows the battery pack 30 to be inserted into the receiving groove 131 from the right to the left. The receiving groove 131 surrounds the battery pack 30 on the left side, upper side, lower side, front side, and rear side of the battery pack 30. In this way, on the one hand, the battery pack 30 can be prevented from accidentally detaching, and at the same time, the mounting portion 13 can also play a role in strengthening the strength of the front and rear connection of the housing. In this way, the mounting portion 13 has a top surface and a bottom surface, the top surface is used to connect the upper side of the housing portion of the motor 20 and the front end of the main handle 11, and the bottom surface is used to connect to the rear end of the main handle 11. Therefore, the mounting portion 13 can play a role in strengthening the strength of the housing while installing the battery pack 30. In this embodiment, the main handle 11 is directly connected to the motor housing portion 14 through the installation portion 13. In this way, in the front-to-back direction, there is a certain gap between the main handle 11 and the installation portion 13 and the rear side of the protective cover 80, which is beneficial to the heat dissipation of the motor 20, gear box and other electronic components in the casing 10, and is also beneficial to the heat dissipation of the battery pack 30.

[0060] The battery pack 30 and the mounting portion 13 form a detachable sliding connection. Specifically, the mounting portion 13 is provided with a guide rail for the battery pack 30 to slide, and the battery pack 30 is provided with a slide groove that cooperates with the guide rail. As another embodiment, the mounting portion 13 may be provided with a slide groove for the battery pack 30 to slide, and the battery pack 30 may be provided with a guide rail that cooperates with the slide groove. In summary, the main handle 11, the housing 10 and the mounting portion 13 are fixedly connected or integrally formed. Preferably, the main handle 11, the housing 10 and the mounting portion 13 are integrally formed, that is, the main handle 11, the housing 10 and the mounting portion 13 are integrally formed, which can be understood as the shield 80 and the housing 10 are two parts. The bevel gear and the large gear are at least partially arranged in the gearbox housing, the gearbox is fixedly connected or integrally formed with the shield 80, and the housing 10 is fixedly connected to the gearbox housing. When the saw blade 51 runs at high speed to cut the workpiece, a large amount of heat will be generated. The shield 80 is made of metal to facilitate the heat dissipation of the saw blade 51, and the housing 10 can be made of plastic.

[0061] The battery pack 30 is mounted to the mounting portion 13 along a first straight line 103, and the first straight line 103 is substantially parallel to the bottom plane 71. In the left-right direction, the projection of the battery pack 30 on the bottom plane 71 protrudes beyond the projection of the motor 20 on the bottom plane 71. In other words, when the battery pack 30 is mounted on the electric circular saw 100, the maximum distance from the battery pack 30 to the first side surface 52 in the direction along the first rotation axis 102 is greater than the maximum distance from the motor 20 to the first side surface 52 in the direction along the first rotation axis 102. In other words, the motor 20 in the present application has a smaller size in the left-right direction than the battery pack 30, shortens the projection length of the motor 20, reduces the width of the entire machine, and brings the center of gravity of the entire machine closer to the saw blade 51, thereby reducing the torque, avoiding the user from applying more force to prevent the electric circular saw 100 from twisting during cutting, and improving the user experience. When the battery pack 30 is installed on the mounting portion 13 along the first straight line 103, the maximum distance L4 of the electric circular saw 100 along the first rotation axis 102 is greater than or equal to 162 mm. When the battery pack 30 is not installed on the mounting portion 13, the maximum distance L5 of the electric circular saw 100 along the first rotation direction is greater than or equal to 159 mm.

[0062] In the present application, the electric circular saw 100 includes a plurality of battery packs 30, and the battery packs 30 and the battery packs 30 are connected in series. Specifically, the electric circular saw 100 can be provided with at least two or more battery packs 30 of the same capacity, so as to not only improve the cutting speed of the electric circular saw 100, but also enhance the overload capacity of the electric circular saw 100. In the left-right direction, the battery pack 30 is arranged on the right side of the cutting plane P. Specifically, the electric circular saw 100 includes at least two battery packs 30. For the convenience of description, the battery pack 30 close to the main handle 11 is defined as the first battery assembly, and the battery pack 30 close to the motor 20 is defined as the second battery assembly. The projection of the main handle 11 in the up-down direction at least partially overlaps with the projection of the first battery assembly in the up-down direction. The first battery assembly is installed to the mounting portion 13 along the first straight line 103, and the second battery assembly is installed to the mounting portion 13 along the second sliding direction, wherein the first straight line 103 is parallel to the second sliding direction, the first straight line 103 intersects with the direction of the first axis 101, and the first straight line 103 and the second sliding direction are in the same direction. The first battery assembly and the second battery assembly are both installed to the right area of ​​the cutting plane P. The first battery assembly and the second battery assembly are both arranged on the upper side of the base plate 70, that is, the first battery assembly and the second battery assembly are arranged on the same side as the motor 20.

[0063] In the present application, as an embodiment, the distance of the first battery assembly in the left-right direction is greater than the distance of the first battery assembly in the front-back direction, and the second battery assembly is arranged in the same manner as the first battery assembly, that is, the first axis is consistent with the second sliding direction, and the first axis is substantially perpendicular to the cutting plane. With this arrangement, the distance of the entire machine in the up-and-down direction is saved, space is saved, and processing is convenient. As another embodiment, the first axis intersects with the cutting plane, that is, it can be understood that the battery pack is slidably installed to the mounting portion in an inclined downward manner. With this arrangement, it is convenient for users to install and remove the battery pack. As some other embodiments, the first axis is substantially parallel to the cutting plane, that is, the battery pack is slidably installed to the mounting portion in a vertically downward manner. With this arrangement, the center of gravity of the entire machine is close to the saw blade to reduce torque.

[0064] In other embodiments, the number of battery packs may also be one.

[0065] In other embodiments, the battery pack may also be arranged in Fig.10The position shown. In this embodiment, the projections of the main handle 311 and the first battery assembly 330a on the plane of the bottom plate 370 at least partially overlap, that is, the first battery assembly 330a is arranged on the lower side of the main handle 311 and the rear side of the bottom plate 370. The projections of the motor 320 and the second battery assembly 330b on the plane where the first rotation axis is located at least partially overlap, the second battery assembly 330b is arranged between the main handle 311 and the motor 320, and is arranged on the upper side of the bottom plate 370, and the first battery assembly 330a and the second battery assembly 330b are arranged separately. Specifically, the first battery assembly 330a is connected to the mounting portion by sliding forward from the rear side, and the second battery assembly 330b is connected to the mounting portion by sliding downward from the upper side. With the above arrangement, the two battery packs can avoid interfering with the operation of the electric circular saw. Of course, the first battery assembly can also be connected to the mounting portion by sliding from the right to the front.

[0066] In other embodiments, the battery pack may also be arranged in Fig.11 In this embodiment, two battery packs 430 are arranged adjacent to each other. The two battery packs 430 can be pushed in a direction perpendicular to the saw blade 450. When the two battery packs 430 are installed to Fig.11 In the position shown, in the front-to-back direction, the two battery packs 430 are arranged between the main handle 411 and the motor 420. When the battery packs 430 are installed on the electric circular saw, the center line of the two battery packs 430 is substantially parallel to the gripping portion 4111 of the main handle 411, and the length of the two battery packs 430 in the left-right direction is within the length of the housing in the left-right direction. Therefore, the two battery packs 430 can avoid interfering with the operation of the electric circular saw.

[0067] Please refer to Fig. 9In the second embodiment shown, the saw blade, the bottom plate 270, the electric circular saw housing and the battery pack are basically the same as those in the first embodiment, and the difference lies in the different arrangement of the motor 220. The parts of the first embodiment that are compatible with the present embodiment can be applied to the present embodiment, and only the differences between the present embodiment and the second embodiment are described below. The second end 223 of the motor 220 is arranged in the first quadrant of the coordinate system, and the first end 222 of the motor 220 is arranged in the first quadrant of the coordinate system. The first axis 201 is obliquely intersected with the first rotating shaft, that is, in the front-to-back direction, the distance from the second end 223 of the motor 220 to the angle plate 272 is greater than the distance from the first end 222 of the motor 220 to the angle plate 272. In this embodiment, the first axis 201 is obliquely intersected with the cutting plane A, that is, the angle formed by the direction of the first axis 201 and the cutting plane A is greater than or equal to 45 degrees and less than or equal to 80 degrees, further, the angle formed by the direction of the first axis 201 and the cutting plane A is greater than or equal to 55 degrees and less than or equal to 80 degrees, further, the angle formed by the direction of the first axis 201 and the cutting plane A is greater than or equal to 60 degrees and less than or equal to 80 degrees, further, the angle formed by the direction of the first axis 201 and the cutting plane A is greater than or equal to 65 degrees and less than or equal to 80 degrees. Further, the angle between the first axis 201 and the cutting plane A is greater than or equal to 45 degrees and less than 78 degrees, further, the angle between the first axis 201 and the cutting plane A is greater than or equal to 55 degrees and less than 78 degrees, the angle between the first axis 201 and the cutting plane A is greater than or equal to 60 degrees and less than or equal to 78 degrees, and the angle between the first axis 201 and the cutting plane A is greater than or equal to 65 degrees and less than or equal to 78 degrees. Through the above arrangement, not only the projection length of the motor 220 on the bottom plane is shortened, the width of the whole machine is reduced, and the distance between the center of gravity of the whole machine and the cutting plane A is smaller, but also the torque is reduced, so that when the electric circular saw is working, the user does not apply more force to prevent the electric circular saw from twisting. At least more than half of the motor 220 is arranged in the first quadrant, so that the rear side of the electric circular saw has more space to set the position of the battery pack and the circuit board, which is convenient for the structural arrangement of the whole machine.

[0068] Fig.13 The structure diagram of the battery pack installed in the electric circular saw in the fifth embodiment is shown. In this embodiment, the saw blade, motor and bottom plate are basically the same as those in the first embodiment, and the only difference is the installation method of the battery pack. The parts of the first embodiment that are compatible with this embodiment can be applied to this embodiment. Only the differences between this embodiment and the first embodiment are introduced below. For the convenience of description, the top, bottom, front, back, left and right defined in the first embodiment will continue to be used.

[0069] Please refer to Figures 13 to 16As shown, the electric circular saw 500 includes a main body 500a and a battery pack assembly 530. The battery pack assembly 530 is mounted on the mounting portion 540 so that the battery pack assembly 530 provides energy to the motor. Specifically, the battery pack assembly 530 includes a first battery pack 531 connected to the housing along a first straight line direction 502 and a second battery pack 532 connected to the housing 510 along a second straight line direction 503. Both the first battery pack 531 and the second battery pack 532 can be detachably connected to the housing 510, that is, when the battery pack is out of power, the user can remove the battery pack and replace it with a new fully charged battery pack to allow the electric circular saw 500 to continue working. In this embodiment, the first battery pack 531 is substantially identical to the second battery pack 532. In the up-down direction, the first battery pack 531 is arranged on the upper side of the second battery pack 532. It should be noted that the number of battery packs in the battery pack assembly 530 can also be one or more than two.

[0070] The first battery pack 531 has a first end 533 and a second end 534 disposed oppositely in the first straight direction 502. Similarly, the second battery pack 532 has a third end 535 and a fourth end 536 disposed oppositely in the second straight direction 503. In the left-right direction, the second end 534 is farther from the saw blade 560 than the first end 533, and the fourth end 536 is farther from the saw blade 560 than the third end 535. In the forward direction of the electric circular saw 500, a first distance a1 from the second end 534 of the first battery pack 531 to the first rotation axis 501 is smaller than the sum of a second distance a2 from the first end 533 of the first battery pack 531 to the first rotation axis 501 in the first straight direction 502 and a distance c1 of the first battery pack 531 in its length direction. Similarly, the third distance a3 from the fourth end 536 of the second battery pack 532 to the first rotation axis 501 is less than the sum of the fourth distance a4 from the third end 535 of the second battery pack 532 to the first rotation axis 501 along the second straight line direction 503 and the distance c2 of the second battery pack 532 in its length direction, that is, a1<a2+c1 and a3<a4+c2. In other words, the first straight line direction 502 and the second straight line direction 503 are both obliquely intersected with the forward direction of the electric circular saw 500, that is, the first battery pack 531 and the second battery pack 532 are slidably connected to the mounting portion 540 at an oblique angle. In this embodiment, the output power of the electric circular saw 500 is greater than or equal to 1.4 kW. In order to ensure the normal operation of the electric circular saw 500 and the prerequisite of its operation time, the voltage of the battery pack assembly 530 is often required to be higher. In other words, the weight of the adapted battery pack assembly 530 is often relatively large, which can easily cause the center of gravity of the battery pack assembly 530 to affect the center of gravity G of the host 500a after the battery pack assembly 530 is installed on the host 500a, causing the center of gravity Q of the electric circular saw 500 to shift to the right, which not only causes the torque to increase, but also makes the electric circular saw 500 prone to rollover when it is stationary. Through the above-mentioned setting, the influence of the weight of the battery pack assembly 530 on the center of gravity of the electric circular saw 500 can be reduced, that is, the center of gravity Q of the electric circular saw 500 is made as close to the center of gravity G of the host 500a as possible, avoiding the situation where the distance between the center of gravity Q of the electric circular saw 500 and the saw blade 560 increases after the user installs the battery pack assembly 530, so that the user needs to use a large force to control the electric circular saw 500. The above arrangement allows the user to control the electric circular saw 500 with less force, thereby improving the user experience and ensuring the smooth operation of the electric circular saw 500.

[0071] The first straight direction 502 is substantially parallel to the second straight direction 503, that is, the first battery pack 531 and the second battery pack 532 are substantially mounted to the housing 510 in the same direction. In the forward direction of the electric circular saw 500, the ratio of the first distance a1 from the second end 534 of the first battery pack 531 to the first rotation axis 501 to the sum of the second distance a2 from the first end 533 of the first battery pack 531 to the first rotation axis 501 along the first straight direction 502 and the distance c1 of the first battery pack 531 in its length direction is greater than or equal to 0.7, that is, The second battery pack 532 and the first battery pack 531 are installed in substantially the same direction. It can be understood that the ratio of the third distance a3 from the fourth end 536 of the second battery pack 532 to the first rotation axis 501 to the sum of the fourth distance a4 from the third end 535 of the second battery pack 532 to the first rotation axis 501 along the second straight line direction 503 and the distance c2 of the second battery pack 532 in its length direction is also greater than or equal to 0.7, that is, , such an arrangement can make the size of the electric circular saw 500 in the left-right direction more reasonable while ensuring the smooth operation of the electric circular saw 500, and avoid increasing the size of the electric circular saw 500 in the left-right direction. In the present application, it is defined that the forward direction of the electric circular saw 500 is substantially consistent with the front-back direction. Of course, the first straight line direction and the second straight line direction may not be parallel, that is, the first straight line direction and the second straight line direction are obliquely intersected. In the present embodiment, it is preferred that the first straight line direction and the second straight line direction are substantially parallel.

[0072] Please refer to Fig.17 The housing 510 includes a first housing portion 511, a second housing portion 512 and a third housing portion 513. The first housing portion 511 and the second housing portion 512 form a housing cavity for accommodating the motor. In the left-right direction, the first housing portion 511 is arranged on the left, the second housing portion 512 and the third housing portion 513 are arranged on the right, and the third housing portion 513 is fixedly connected to the second housing portion 512, that is, the third housing portion 513 can be separated from the second housing portion 512. The second housing portion 512 and the third housing portion 513 form a mounting portion 540, and the mounting portion 540 is configured to detachably mount at least one battery pack to provide energy to the motor. Specifically, in the front-to-back direction, the mounting portion 540 is arranged between the motor and the main handle 520. In the left-to-right direction, the main handle 520 is basically symmetrically arranged about a mid-dividing plane P1, and the mounting portion 540 is arranged on the right side of the mid-dividing plane P1. It can also be understood that the mounting portion 540 is arranged on the right side of the main handle 520. Disposing the mounting portion 540 between the motor and the main handle 520 can fully utilize the space between the motor and the main handle 520, and the mounting portion 540 in the present application is basically open, so the user can match battery packs of different capacities according to needs.

[0073] In this embodiment, the first battery pack 531 and the second battery pack 532 are arranged parallel to and side by side on the upper side of the bottom plate 550, that is, the first battery pack 531 and the second battery pack 532 are both slidably connected to the mounting portion 540 along the first straight direction 502, wherein the angle between the first straight direction 502 and the forward direction of the electric circular saw 500 in the projection plane perpendicular to the up-down direction is α, and the range of the angle α is greater than 0 degrees and less than or equal to 30 degrees. By slidingly connecting the battery pack assembly 530 to the mounting portion 540 in a forward tilted manner, such an arrangement makes the angle α set within a more reasonable range, and the user will not be interfered by other components when plugging and unplugging the battery pack assembly 530, thereby facilitating the user to plug and unplug the battery pack assembly 530. Preferably, the range of the angle α is greater than 10 degrees and less than or equal to 25 degrees, which has a better effect. The angle β between the first straight direction 502 and the forward direction of the electric circular saw 500 in the projection plane perpendicular to the front-back direction is greater than or equal to 0 degrees and less than or equal to 10 degrees. That is, the battery pack assembly 530 is slidably connected to the mounting portion 540 in a downwardly tilted manner, that is, the end of the battery pack is slightly tilted up, making it convenient for the user to plug and unplug the battery pack assembly 530.

[0074] Furthermore, the ratio of the first distance a1 from the second end 534 of the first battery pack 531 to the first rotation axis 501 along the forward direction of the electric circular saw 500 to the sum of the second distance a2 from the first end 533 of the first battery pack 531 to the first rotation axis 501 along the first straight line direction 502 and the distance c1 of the first battery pack 531 in its length direction is greater than or equal to 0.8 and less than or equal to 1.2. In other words, the first battery pack 531 will be slidably mounted on the housing 510 in an inclined manner. This arrangement can avoid the first battery pack 531 being too long in the front-to-back direction or the left-to-right direction, thereby avoiding the electric circular saw 500 being too long in the front-to-back direction and the left-to-right direction as a whole. At the same time, the space between the motor and the main handle 520 can be reasonably utilized to make the overall structure layout more reasonable. Preferably, the ratio of the first distance a1 to the sum of the second distance a2 and the length c1 of the battery pack is greater than or equal to 0.9 and less than or equal to 1.1, which has a better effect.

[0075] The mounting portion 540 includes a guide portion 541, a positioning portion 542 and a connecting portion 543. The guide portion 541 is used to guide the battery pack assembly 530 to slide along the first straight line direction 502, the connecting portion 543 is used to connect with the battery pack assembly 530 to realize power supply, and the positioning portion 542 and the mounting portion 540 are used to position and fix the connecting portion 543. In this embodiment, the connecting portion 543 is a connecting seat, and the battery pack assembly 530 is connected to the connecting seat to realize the transmission of energy of the battery pack assembly 530 to the motor. The connecting portion 543 is fixedly connected to the guide portion 541 through the positioning portion 542 to realize positioning. Specifically, a positioning groove 5421 is provided on the positioning portion 542, and the connecting seat slides into the positioning groove 5421 along a direction substantially parallel to the first straight line direction 502. After the connecting seat slides into place, the guide portion 541 is fixedly installed so that the guide portion 541, the positioning portion 542 and the connecting portion 543 remain in a relatively fixed state. The positioning portion 542 is formed by the second housing portion 512, the guide portion 541 is formed by the third housing portion 513, and the third housing portion 513 is fixedly connected to the second housing portion 512 by means of screws, so that the battery pack assembly 530 can be slidably connected to the connecting portion 543 through the guide portion 541. In addition, the mounting portion 540 is made of a separate housing, so that the arrangement can be convenient for processing and easy to implement.

[0076] The electric circular saw 500 further includes a switch assembly 521 mounted on the main handle 520, and the switch assembly 521 is used for a user to operate to control the operation of the electric circular saw 500. In this embodiment, the ratio of the distance H1 from the second end 534 of the first battery pack 531 to the first rotation axis 501 in the forward direction of the electric circular saw 500 to the distance H2 from the switch assembly 521 to the first rotation axis 501 in the forward direction of the electric circular saw 500 is greater than or equal to 0.8 and less than or equal to 1.1. That is, the switch assembly 521 is arranged at the rear side of the first battery pack 531, and there is enough space between the switch assembly 521 and the first battery pack 531 for the user to operate the switch assembly 521. This arrangement can prevent the first battery pack 531 from affecting the user's operation of the switch assembly 521 when the electric circular saw 500 is in operation.

[0077] The distance E from the second end 534 of the first battery pack 531 to the midplane P1 along the first rotation axis 501 is greater than 45 mm, so that there is enough space between the second end of the battery pack assembly 530 and the main handle 520 in the left-right direction for the user to operate the switch assembly 521 .

[0078] Please refer to Fig.18 and Fig.19As shown, the electric circular saw 500 further includes a guard 580 and a chip removal assembly 570. The guard 580 is used to partially surround the saw blade 560 in the circumferential direction around the first rotation axis to protect the safety of the user. The chip removal assembly 570 is used to discharge the airflow A containing wood chips when the electric circular saw is cutting. Specifically, the chip removal assembly 570 includes an auxiliary handle 571 for the user to hold, an exhaust element 572 for discharging the airflow A containing wood chips, and a guide portion 575 for guiding the flow direction of the airflow A. The auxiliary handle 571 is disposed on the upper side of the motor, one end of the auxiliary handle 571 is fixed to the guard 580, and the other end is fixedly connected to the housing 510. In the direction in which the auxiliary handle 571 extends, a central channel 573 is formed in the center of the auxiliary handle 571 for the flow of airflow A. One end of the central channel 573 is connected to the accommodating cavity of the housing 510, and the other end of the central channel 573 is connected to the exhaust element 572, and finally the airflow A with wood chips is discharged from the exhaust hole 574 on the exhaust element 572. The exhaust element 572 is rotatably connected to the auxiliary handle 571. This arrangement can facilitate the user to adjust the direction of the exhaust hole 574 to keep the airflow A discharged from the exhaust element 572 away from the user. The guide portion 575 is formed by the shield 580 and the auxiliary handle 571 to guide the airflow A as Fig.17 The flow direction shown is to the central channel 573. Specifically, the auxiliary handle 571 on one side close to the shield 580 cooperates with the left side of the shield 580 to form a guide portion 575 for guiding the airflow A, and the guide portion 575 is connected to the accommodating cavity. The basic principles, main features and advantages of the present invention are shown and described above.

[0079] Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. An electric circular saw, comprising: Host; A battery pack assembly, mounted on the host, for providing an energy source for the host; The host comprises: a saw blade capable of rotating about a first rotation axis; A housing is formed around a receiving cavity, and the housing includes a main handle; A motor, at least partially disposed in the accommodating cavity; A transmission assembly, comprising a first transmission member connected to the motor to introduce power into the transmission assembly and a second transmission member for outputting power, wherein the second transmission member is rotatable around the first rotation axis; Features: The battery pack assembly includes at least a first battery pack mounted to the housing along a first linear direction and a second battery pack mounted to the housing along a second linear direction; The first battery pack has a first end and a second end that are oppositely disposed along the first straight line, and the second end is farther away from the saw blade than the first end; The second battery pack has a third end and a fourth end that are oppositely disposed along the second straight line direction, and the fourth end is farther away from the saw blade than the third end; It is defined that the distance from the second end of the first battery pack to the first rotation axis along the forward direction of the electric circular saw is a first distance a1; It is defined that the distance from the first end of the first battery pack to the first rotation axis along the first straight line is a second distance a2; It is defined that in the length direction of the first battery pack, the length of the first battery pack is c1; It is defined that the distance from the fourth end of the second battery pack to the first rotation axis along the forward direction of the electric circular saw is a third distance a3; It is defined that the distance from the third end of the first battery pack to the first rotation axis along the second straight line direction is a fourth distance a4; It is defined that in the length direction of the second battery pack, the length of the second battery pack is c2; The first distance a1 is smaller than the sum of the second distance a2 and the length c1 of the first battery pack, and the third distance a3 is smaller than the sum of the fourth distance a4 and the length c2 of the second battery pack.

2. The electric circular saw according to claim 1, characterized in that: The first straight line direction is substantially parallel to the second straight line direction; The ratio of the first distance a1 to the sum of the second distance a2 and the length c1 of the first battery pack is greater than or equal to 0.

7.

3. The electric circular saw according to claim 2, characterized in that: The housing is connected to or formed with a mounting portion for mounting a battery pack assembly. In the front-to-back direction, the mounting portion is arranged between the main handle and the motor; in the left-to-right direction, the mounting portion is arranged on the right side of the main handle.

4. The electric circular saw according to claim 3, characterized in that: The mounting portion is configured to detachably mount at least one battery pack to provide energy to the motor.

5. The electric circular saw according to claim 4, characterized in that: The mounting portion includes a guide portion for guiding the battery pack assembly to move along a first straight line direction, a connecting portion for connecting with the battery pack assembly, and a positioning portion for positioning the connecting portion; The housing comprises a first housing portion, a second housing portion and a third housing portion which are fixedly connected, the first housing portion and the second housing portion form the accommodating cavity, the second housing portion forms the positioning portion, and the third housing portion forms the guiding portion.

6. The electric circular saw according to claim 5, characterized in that: The main machine also includes a bottom plate for contacting the workpiece to be cut; The mounting portion is configured so that the two battery packs are arranged side by side on the upper side of the base plate; The ratio of the first distance a1 to the sum of the second distance a2 and the first battery pack length c1 is greater than or equal to 0.8 and less than or equal to 1.

2.

7. The electric circular saw according to claim 2, characterized in that: The main unit also includes a switch assembly mounted to the main handle; In the up-down direction, the first battery pack is located on the upper side of the second battery pack; A ratio of a distance H1 from the second end of the first battery pack to the first rotation axis in the forward direction of the electric circular saw to a distance H2 from the switch assembly to the first rotation axis in the forward direction of the electric circular saw is greater than or equal to 0.8 and less than or equal to 1.

1.

8. The electric circular saw according to claim 2, characterized in that: The angle between the first straight line direction and the forward direction of the electric circular saw in a projection plane perpendicular to the up-down direction is α, and the range of the angle α is greater than 0 degrees and less than or equal to 30 degrees.

9. The electric circular saw according to claim 8, characterized in that: An included angle β between the first straight line direction and the forward direction of the electric circular saw in a projection plane perpendicular to the front-rear direction is in a range of greater than or equal to 0 degrees and less than or equal to 10 degrees.

10. The electric circular saw according to claim 2, characterized in that: The host also includes: A guard, used for partially surrounding the saw blade in the circumferential direction of the first rotation axis; A chip removal assembly, fixedly connected to the shield, the chip removal assembly comprising a central channel for communicating with the accommodating cavity and an exhaust hole for chip removal; When the motor rotates, an airflow with wood chips is formed, and the chip removal assembly guides the airflow with wood chips to flow through the central channel and finally discharge the air from the exhaust hole.

11. The electric circular saw according to claim 10, characterized in that: The chip removal assembly includes an auxiliary handle forming the central channel and an exhaust element forming the exhaust hole, and the exhaust element is connected to the auxiliary handle; The chip conveying assembly further includes a guide portion for guiding the airflow to flow through the central channel, wherein the guide portion is formed by the shield and the auxiliary handle.

12. An electric circular saw comprising: Host; A battery pack assembly, mounted on the host, for providing an energy source for the host; The host comprises: a saw blade capable of rotating about a first rotation axis; A housing is formed around a receiving cavity, and the housing includes a main handle; A motor, at least partially disposed in the accommodating cavity; A transmission assembly, comprising a first transmission member connected to the motor to introduce power into the transmission assembly and a second transmission member for outputting power, wherein the second transmission member is rotatable around the first rotation axis; Features: The motor shaft has a first end and a second end oppositely disposed in its length direction, and the second end of the motor shaft is used to output power to the transmission assembly; The distance between the first end of the motor shaft and the saw blade is smaller than the sum of the distance between the second end of the motor shaft and the saw blade and the length of the motor shaft; The battery pack assembly includes at least a first battery pack mounted to the housing along a first linear direction and a second battery pack mounted to the housing along a second linear direction; The first battery pack has a first end and a second end that are oppositely disposed along the first straight line, and the second end is farther away from the saw blade than the first end; The second battery pack has a third end and a fourth end that are oppositely disposed along the second straight line direction, and the fourth end is farther away from the saw blade than the third end; It is defined that the distance from the second end of the first battery pack to the first rotation axis along the forward direction of the electric circular saw is a first distance a1; It is defined that the distance from the first end of the first battery pack to the first rotation axis along the first straight line is a second distance a2; Defined in the length direction of the first battery pack, the length of the first battery pack is c1; It is defined that the distance from the fourth end of the second battery pack to the first rotation axis along the forward direction of the electric circular saw is a third distance a3; It is defined that the distance from the third end of the first battery pack to the first rotation axis along the second straight line direction is a fourth distance a4; Defined in the length direction of the second battery pack, the length of the second battery pack is c2; The first distance a1 is smaller than the sum of the second distance a2 and the length c1 of the first battery pack, and the third distance a3 is smaller than the sum of the fourth distance a4 and the length c2 of the second battery pack.

13. An electric circular saw comprising: Host; A battery pack assembly, mounted on the host, for providing an energy source for the host; The host comprises: a saw blade capable of rotating about a first rotation axis; A housing is formed around a receiving cavity, and the housing includes a main handle; A motor, at least partially disposed in the accommodating cavity; A transmission assembly, comprising a first transmission member connected to the motor to introduce power into the transmission assembly and a second transmission member for outputting power, wherein the second transmission member is rotatable around the first rotation axis; A bottom plate, used for contacting with the workpiece to be cut; Features: The battery pack assembly includes at least a first battery pack mounted to the housing along a first linear direction, the first battery pack being located on an upper side of the bottom plate; The first battery pack has a first end and a second end that are oppositely disposed along the first straight line, and the second end is farther away from the saw blade than the first end; It is defined that the distance from the second end of the first battery pack to the first rotation axis along the forward direction of the electric circular saw is a first distance a1; It is defined that the distance from the first end of the first battery pack to the first rotation axis along the first straight line is a second distance a2; It is defined that in the length direction of the first battery pack, the length of the first battery pack is c1; The first distance a1 is smaller than the sum of the second distance a2 and the length c1 of the first battery pack.

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