Electric circular saw

Abstract

The invention discloses an electric circular saw which comprises a shell forming a containing space; the holding part is used for being held by a user; the output shaft is used for installing working accessories; the first motor comprises a first motor shaft used for driving the output shaft to rotate, the first motor shaft is not parallel to the output shaft, and the outer diameter of the first motor is smaller than 45 mm; and the transmission assembly is used for realizing power transmission between the first motor shaft and the output shaft. The electric circular saw is reasonable in structural arrangement, the balance of the electric circular saw is improved, and the size of the whole machine in the width direction is reduced.

Description

Technical Field

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

[0002] The cutting tool refers to an electric tool used to perform cutting operations. In this embodiment, the cutting tool is a handheld cutting tool, including an electric circular saw, a reciprocating saw, a multifunctional cutting machine, etc. The cutting tool uses working accessories such as saw blades and saw blades to perform cutting operations.

[0003] An electric circular saw generally includes a housing, a saw blade, a guard, a bottom plate, a first motor, and a power supply. In most existing circular saws, the first motor is placed perpendicular to the saw blade, and the size of the entire machine, especially in the width direction, is large and the machine is bulky. In addition, the center of gravity of the existing machine is far away from the surface where the saw blade is located, and the balance of the entire machine is poor.

[0004] Therefore, an electric circular saw is needed to solve the above problems. Summary of the invention

[0005] One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, one object of the present application is to provide a cutting tool and an electric circular saw.

[0006] A cutting tool comprises: a shell forming a containing space; a gripping portion for a user to grip; an output shaft for installing a working accessory, the working accessory performing a cutting operation; a first motor comprising a first motor shaft for driving the output shaft to rotate, the outer diameter D of the first motor being less than 40 mm; and a transmission assembly for realizing power transmission between the first motor shaft and the output shaft.

[0007] In some embodiments, the first motor shaft is non-parallel to the output shaft.

[0008] In some embodiments, the plane where the working attachment is located is defined as a cutting plane, and the first motor shaft is substantially parallel to the cutting plane.

[0009] In some embodiments, a ratio of a length L of the first motor to an outer diameter D of the first motor is greater than or equal to 1.

[0010] In some embodiments, a ratio of a length L of the first motor to an outer diameter D of the first motor is greater than 1.5.

[0011] In some embodiments, a ratio of a length L of the first motor to an outer diameter D of the first motor is greater than 1.8.

[0012] In some embodiments, the first motor is arranged to be tilted upward, and the tail end of the first motor faces the front of the cutting tool.

[0013] In some embodiments, a shield is further included, the working attachment moves in the shield, the first motor is located on one side of the shield, and the first motor is projected toward a plane extending from the shield to obtain a projection, and at least half of the projection is located on the shield.

[0014] In some embodiments, the plane where the working accessory is located is defined as a cutting plane, and the cutting tool also includes a circuit board, which is electrically connected to the first motor, and the output end of the circuit board and the first motor shaft are located on the same side of the cutting plane.

[0015] In some embodiments, a depth adjustment frame is provided on the shield, and the cutting tool further includes a circuit board, which is electrically connected to the first motor. The working accessory moves in the shield, and the circuit board is located between the depth adjustment frame and the shield.

[0016] In some embodiments, the plane where the working attachment is located is defined as a cutting plane, and the distance from the center line of the grip portion to the cutting plane is less than or equal to 30 mm.

[0017] In some embodiments, the plane where the working attachment is located is defined as the cutting plane, the distance between the center of gravity G of the cutting tool and the cutting plane is less than or equal to 30 mm, and the center of gravity G of the cutting tool is located on either side of the cutting plane.

[0018] In some embodiments, the transmission assembly includes a first bevel gear and a second bevel gear that are meshed with each other, the first bevel gear is arranged at the output end of the first motor shaft, the second bevel gear is arranged on the output shaft, the first motor shaft is parallel to the working accessory, or the first motor shaft is arranged at an angle relative to the working accessory.

[0019] In some embodiments, a second motor is further included, the second motor includes a second motor shaft for driving the output shaft to rotate, and the outer diameter D of the second motor is less than 45 mm.

[0020] In some embodiments, the plane where the working attachment is located is defined as a cutting plane, and the cutting tool also includes a circuit board, which is electrically connected to the first motor, and the circuit board is passed through by the cutting plane.

[0021] The present application adopts the following technical solution: an electric circular saw, comprising: a shell, forming a accommodating space; a grip portion, for a user to hold; an output shaft, for installing work accessories; and also comprising: a first motor, comprising a first motor shaft for driving the output shaft to rotate, and the first motor shaft is not parallel to the output shaft, and an outer diameter D of the first motor is less than 45 mm; a transmission assembly, for realizing power transmission between the first motor shaft and the output shaft.

[0022] In some embodiments, a ratio of a length L of the first motor to an outer diameter D of the first motor is greater than 1.

[0023] In some embodiments, the axis of the first motor is parallel to the working attachment, the first motor is arranged to be inclined upward, and the tail end of the first motor faces the front of the electric circular saw.

[0024] In some embodiments, a shield is further included, the working attachment moves in the shield, the first motor is located on one side of the shield, and the first motor is projected toward a plane extending from the shield to obtain a projection, and at least half of the projection is located on the shield.

[0025] In some embodiments, the plane where the working attachment is located is defined as a cutting plane, and the electric circular saw further includes a circuit board, which is electrically connected to the first motor, and the output end of the circuit board and the first motor shaft are located on the same side of the cutting plane.

[0026] In some embodiments, a depth adjustment frame is provided on the shield, the electric circular saw further comprises a circuit board, the circuit board is electrically connected to the first motor, the working accessory moves in the shield, and the circuit board is located between the depth adjustment frame and the shield.

[0027] In some embodiments, the plane where the working attachment is located is defined as a cutting plane, and the distance from the center line of the grip portion to the cutting plane is less than or equal to 30 mm.

[0028] In some embodiments, the plane where the working attachment is located is defined as the cutting plane, the distance between the center of gravity G of the electric circular saw and the cutting plane is less than or equal to 30 mm, and the center of gravity G of the electric circular saw is located on either side of the cutting plane.

[0029] In some embodiments, the transmission assembly includes a first bevel gear and a second bevel gear that are meshed with each other, the first bevel gear is arranged at the output end of the first motor shaft, the second bevel gear is arranged on the output shaft, the first motor shaft is parallel to the working accessory, or the first motor shaft is arranged at an angle relative to the working accessory.

[0030] In some embodiments, a second motor is further included, the second motor includes a second motor shaft for driving the output shaft to rotate, and the outer diameter D of the second motor is less than 45 mm.

[0031] In some embodiments, the plane where the working attachment is located is defined as a cutting plane, and the electric circular saw further includes a circuit board, the circuit board is electrically connected to the first motor, and the cutting plane passes through the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a view of a first motor in an electric circular saw located in a mounting cavity;

[0033] Figure 2 It is a schematic diagram of an electric circular saw;

[0034] Figure 3 is another schematic diagram of an electric circular saw;

[0035] Figure 4 is a view of a transmission assembly in an electric circular saw;

[0036] Figure 5 is a side view of a first motor of an electric circular saw;

[0037] Figure 6 yes Figure 2 a side view of the illustrated circular saw;

[0038] Figure 7 yes Figure 3 a side view of the illustrated circular saw;

[0039] Figure 8 is a schematic diagram of an electric circular saw having dual motors;

[0040] Fig. 9 It is a schematic diagram of the relative position of a cutting plane and an axis of a first motor shaft in an electric circular saw;

[0041] Fig.10 It is another schematic diagram of an electric circular saw;

[0042] Fig.11 yes Fig.10 Internal schematic diagram of

[0043] Fig.12 is a schematic diagram of an electric circular saw provided with a counterweight;

[0044] Fig.13 is yet another schematic diagram of an electric circular saw;

[0045] Fig.14 yes Fig.13 Schematic diagram of the internal structure;

[0046] Fig.15 It is a schematic diagram of the structure of an electric circular saw;

[0047] Fig.16 It is a schematic diagram of the structure of another electric circular saw;

[0048] Fig.17 yes Fig.16 A schematic diagram of a circular saw is shown;

[0049] Fig.18 yes Fig.17 A front view of the circular saw shown;

[0050] Fig.19 It is a schematic diagram of a reciprocating saw;

[0051] Fig. 20 It is a schematic diagram of the inside of a reciprocating saw;

[0052] Fig.21 It is a schematic diagram of the transmission structure of a reciprocating saw;

[0053] Fig. 22 It is a schematic diagram of the transmission structure of a reciprocating saw from another perspective;

[0054] Fig.23 yes Fig. 22 A schematic diagram of the second sleeve in FIG.

[0055] Fig.24 yes Fig. 22 Schematic diagram of the reciprocating structure without the second sleeve. DETAILED DESCRIPTION

[0056] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0057] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0058] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, an electric circular saw and / or an electric circular saw can represent three situations: the existence of an electric circular saw alone, the existence of an electric circular saw and an electric circular saw at the same time, and the existence of an electric circular saw alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0059] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0060] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0061] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0062] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0063] Cutting tools refer to electric tools used to perform cutting operations. Cutting tools can be handheld cutting tools, including electric circular saws, reciprocating saws, multi-function cutting machines, etc. Cutting tools use working accessories such as saw blades and saw blades to perform cutting operations.

[0064] The electric circular saw 10 is a commonly used cutting tool in daily life, and can be used to cut wood, fiberboard, plastic, etc. The working accessories of the electric circular saw 10 can be a circular saw blade, a grinding wheel, or a grinding wheel, etc. The motor shaft of the motor drives the output shaft to rotate, thereby driving the working accessories to rotate to achieve cutting, grinding, etc. of the object.

[0065] In the prior art, since the motor and the working accessories are arranged vertically and the motor is heavy, the center of gravity of the electric circular saw 10 is biased toward the side with the motor, and the center of gravity of the machine is far away from the surface where the saw blade is located, resulting in poor balance of the whole machine. Figure 1-Figure 14 As shown, the present application provides various embodiments of electric circular saws. Taking the electric circular saw 10 as an example, the electric circular saw 10 includes a housing 1 , a grip 2 , an output shaft 12 , a first motor 3 and a transmission assembly 8 .

[0066] Among them, the shell 1 forms a accommodating space, and the gripping portion 2 is connected to the rear end of the shell 1 (the end away from the working forward direction of the electric circular saw 10) for the user to hold; the output shaft 12 is rotatably arranged on the shell 1, and the output shaft 12 is used to fix and install the working accessory 4; the first motor 3 includes a first motor shaft 30 for driving the output shaft 12 to rotate, and the first motor shaft 30 is not parallel to the output shaft 12, and the outer diameter D of the first motor 3 is less than 45mm; the transmission assembly 8 is arranged on the shell 1, and is used to realize power transmission between the first motor shaft 30 and the output shaft 12.

[0067] In some embodiments, the outer diameter D of the first motor 3 is less than or equal to 40 mm; in some embodiments, the outer diameter D of the first motor 3 is less than or equal to 38 mm; in some embodiments, the outer diameter D of the first motor 3 is less than or equal to 36 mm; in some embodiments, the outer diameter D of the first motor 3 is less than or equal to 34 mm; in some embodiments, the outer diameter D of the first motor 3 is less than or equal to 32 mm; in some embodiments, the outer diameter D of the first motor 3 is less than or equal to 30 mm.

[0068] Since the first motor shaft 30 is not parallel to the output shaft 12, the first motor 3 and the output shaft 12 are arranged obliquely, shortening the size of the whole machine in the width direction, making the center of gravity of the machine close to the surface where the working attachment 4 is located, and by adopting a thin motor with an outer diameter D less than 45 mm, the weight of the whole machine is reduced, making it easier for users to control it through the grip 2. Through reasonable structural arrangement, the balance of the electric circular saw 10 is further improved.

[0069] like Figure 1 As shown, in some embodiments, the rear end of the housing 1 has an extension 11, the grip 2 is connected to the housing 1 and the extension 11, and the grip 2, the housing 1 and the extension 11 form a hand-held space, and the user holds the grip 2 with the fingers located in the hand-held space. The above structure can ensure that the grip 2 is stably connected to the housing 1. Figure 3 As shown, in some embodiments, the extension portion 11 may not be provided on the housing 1, and one end of the grip portion 2 is directly connected to the housing 1. The above structure is simple and saves materials. In some embodiments, the grip portion 2 and the housing 1 are an integrated structure, which can ensure the stability of the connection between the grip portion 2 and the housing 1.

[0070] like Figure 1 As shown, in some embodiments, the housing 1 has an installation cavity for accommodating the first motor 3, and the first motor 3 is fixedly arranged in the installation cavity. Through the above arrangement, on the one hand, the first motor 3 is hidden, so that the electric circular saw 10 is overall beautiful and complete; on the other hand, the first motor 3 is protected to prevent external debris or debris caused by cutting from affecting the first motor 3.

[0071] In some embodiments, the ratio of the length L of the first motor 3 to the outer diameter D of the first motor 3 is greater than 1. That is, the length L of the first motor 3 is greater than the outer diameter D of the first motor 3. In some embodiments, the ratio of the length L of the first motor 3 to the outer diameter D of the first motor 3 is greater than or equal to 1.2, 1.4, 1.6, 1.8, 2.0, 2.1, 2.2, 2.3, 2.4 or 2.5. By reducing the outer diameter D of the first motor 3, the width of the whole machine can be shortened, thereby adjusting the center of gravity of the whole machine to be close to the working attachment 4. The length L of the first motor 3 is relatively long, which can ensure that the output torque of the first motor 3 is relatively large. In one embodiment, the first motor 3 is an inner rotor motor with an outer diameter D of 31 mm, a length L of 74 mm, and a maximum output power of 900 W.

[0072] like Figure 2 and Figure 3 As shown, in some embodiments, the axis 35 of the first motor 3 is parallel to the working attachment 4, and the first motor 3 is arranged tilted upward. Figure 4 and Figure 5 As shown, the first motor 3 also includes a first motor shaft 30, which is used to output power. The first motor 3 includes a head end 36 and a tail end 37 that are arranged opposite to each other, the head end 36 is connected to the first motor shaft 30, and the tail end 37 is the end of the motor 3 farthest from the first motor shaft 30.

[0073] Combination Figure 6 and Figure 7 As shown, there is a first plane 110 that divides the working attachment 4 of the electric circular saw 10 into two equal parts along the front-to-back direction, and the first plane 110 is perpendicular to the bottom plane of the depth adjustment frame 5. The electric circular saw 10 includes a front portion 101 and a rear portion 102, the front portion 101 is located on the front side of the first plane 110, and the rear portion 102 is located on the rear side of the first plane 110. In the electric circular saw 10, the tail end 37 of the first motor 3 faces the front portion 101 of the electric circular saw 10. In the electric circular saw 20, the tail end 37 of the first motor 3 faces the rear portion 102 of the electric circular saw 10. In some embodiments, the first motor 3 is completely located at the front portion 101 of the electric circular saw 10. In some embodiments, the first motor 3 is completely located at the rear portion 102 of the electric circular saw 20.

[0074] Through the above arrangement, the first motor 3 is parallel to the working attachment 4, which can further shorten the width of the electric circular saw, and make the center of gravity of the whole machine closer to the working attachment 4. The tail end 37 of the first motor 3 is toward the front part 101 of the electric circular saw 10, which refers to one end of the cutting forward direction of the electric circular saw 10. The first motor 3 is located in the front half of the electric circular saw 10, which can increase the weight of the front half of the electric circular saw 10, so as to ensure that the working attachment 4 is stably pressed on the cutting object when the electric circular saw 10 is working.

[0075] In some embodiments, the electric circular saw 10 further includes a shield 7, the working accessory 4 moves in the shield 7, the first motor 3 is located on one side of the shield 7, and the first motor 3 is projected toward the plane extending from the shield 7 to obtain a projection, and at least half of the projection is located on the shield 7. The shield 7 is made of aluminum or aluminum alloy. The shield 7 includes a fixed portion 71 and a moving portion 72, the fixed portion 71 is connected to the housing 1, the moving portion 72 is rotatably arranged on the fixed portion 71, the moving portion 72 extends relative to the fixed portion 71, the lower part of the working accessory 4 is located in the moving portion 72, and a spring is arranged between the moving portion 72 and the fixed portion 71. When the working accessory 4 cuts an object, the object will push the moving portion 72 to rotate and retract relative to the fixed portion 71. After the work is completed, the moving portion 72 extends relative to the fixed portion 71 under the action of the spring, thereby protecting the working accessory 4. Moreover, most of the volume of the first motor 3 overlaps with the shield 7, so that the center of gravity of the positive pole does not exceed the height of the shield 7, thereby reducing the center of gravity of the whole machine.

[0076] like Figure 2 and Fig. 9 As shown, in some embodiments, the plane where the working attachment 4 is located is defined as the cutting plane 6, and the electric circular saw 10 also includes a circuit board 31, the circuit board 31 is electrically connected to the first motor 3, and the output end of the circuit board 31 and the first motor shaft 30 are located on the same side of the cutting plane 6. In some embodiments, the bottom of the installation box on which the circuit board 31 is installed is in contact with the shield 7, and the heat generated by the operation of the circuit board 31 is discharged through the shield 7, which is convenient for dissipating the heat of the circuit board 31 and ensuring that the circuit board 31 can work normally and efficiently. In some embodiments, the circuit board 31 is a printed circuit board 31 (PCB board), and in some other embodiments, it can also be controlled by a PLC (programmable logic controller), an STM32 controller or a single-chip microcomputer, and no excessive restrictions are made here.

[0077] In some embodiments, a depth adjustment frame 5 is provided on the shield 7, and the circuit board 31 is located between the depth adjustment frame 5 and the shield 7. The depth adjustment frame 5 abuts against the end surface of the mounting box of the circuit board 31 through screws, and the position of the depth adjustment frame 5 is locked by the friction between the screws and the end surface of the mounting box.

[0078] like Fig. 9As shown, in some embodiments, the plane where the working attachment 4 is located is defined as the cutting plane 6, and the center line 9 of the gripping portion 2 (see Figure 1 ) is basically located on the cutting plane 6. The center line 9 of the gripping portion 2 basically bisects the gripping portion 2 in the left-right direction. In some embodiments, the distance from the center line 9 of the gripping portion 2 to the cutting plane 6 is less than or equal to 30 mm. The cutting plane 6 passes through the gripping portion 2, and the gripping portion 2 basically extends along the center line 9 of the gripping portion 2 in the front-to-back direction, and in the up-down and left-to-right directions, the center line 9 of the gripping portion 2 basically bisects the gripping portion 2. The above arrangement facilitates the use of the user, thereby ensuring the accuracy of the cutting process.

[0079] In some embodiments, the plane where the working attachment 4 is located is defined as the cutting plane 6, and the distance between the center of gravity G of the electric circular saw 10 and the cutting plane 6 is less than or equal to 30 mm, and can be 25 mm, 20 mm, 10 mm, etc., and the center of gravity G of the whole machine is located on any side of the cutting plane 6. In some embodiments, a battery pack 34 is installed on the electric circular saw 10, and the battery pack 34 is electrically connected to the first motor 3 to provide the first motor 3 with the power required for operation. At this time, the center of gravity G of the whole machine is the center of gravity when the battery pack 34 is installed. In some other embodiments, the battery pack 34 is not installed on the electric circular saw 10, and the first motor 3 can also be connected to AC or DC power through a wire.

[0080] like Figure 4 As shown, in some embodiments, the transmission assembly 8 includes a first bevel gear 811 and a second bevel gear 812 that are meshed with each other, the first bevel gear 811 is arranged at the output end of the first motor shaft 30, the second bevel gear 812 is arranged on the output shaft 12, the first motor shaft 30 is parallel to the working accessory 4, or the first motor shaft 30 is inclined relative to the working accessory 4.

[0081] like Figure 8 As shown, in some embodiments, the electric circular saw 25 also includes a second motor 32, and the second motor 32 includes a second motor shaft 321 for driving the output shaft 12 to rotate, and the outer diameter D of the second motor 32 is less than 45 mm. In some embodiments, the second motor shaft 321 is not parallel to the output shaft 12, so that the second motor 32 and the output shaft 12 are arranged obliquely, shortening the size of the whole machine in the width direction, so that the center of gravity of the machine is close to the surface where the working attachment 4 is located, and by using a thin motor with an outer diameter D less than 45 mm, the weight of the whole machine is reduced. By using the first motor 3 and the second motor 32 to drive the output shaft 12, the output power of the electric circular saw 10 can be further improved, and relatively hard objects can be cut. In some embodiments, three or more motors can be arranged to drive the output shaft 12, and no excessive restrictions are made here.

[0082] In some embodiments, the axis 35 of the first motor 3 is located at an arbitrary angle with the bottom plane of the depth adjustment frame 5, and the top of the first motor 3 can face different directions such as the front and rear of the electric circular saw, and can be arranged according to actual usage.

[0083] like Fig.10 and Fig.11 As shown, in some embodiments, in order to further reduce the distance between the center of gravity of the electric circular saw 40 and the working accessory 4, the axis 35 of the first motor 3 is substantially coincident with the plane where the working accessory 4 is located, and the first motor 3 is connected to the output shaft 12 through a secondary transmission assembly 8. The transmission shaft 33 can be rotatably set in the electric circular saw 40, and the first gear 331 and the second gear 332 are fixedly installed at both ends of the transmission shaft 33. The first gear 331 is connected to the first motor shaft 30 of the first motor 3 through gear transmission, and the second gear 332 is connected to the bevel gear on the output shaft 12 to achieve a secondary transmission. In some other embodiments, chain transmission or synchronous belt transmission can also be used to achieve a secondary transmission, and no excessive restrictions are made here. Through the above-mentioned settings, it is convenient to arrange the position of the first motor 3, and further improve the balance of the electric circular saw 40.

[0084] Since the first motor 3 is located on one side of the working attachment 4, even if the installation method of the first motor 3 is adjusted, the center of gravity of the whole machine cannot be basically located on the plane where the working attachment 4 is located. Fig.12 As shown, in some embodiments, a counterweight 13 is installed on the electric circular saw 50, the counterweight 13 and the first motor 3 are located on both sides of the working accessory 4, and the battery pack 34 is placed on one side of the center of the grip 2. The center of gravity of the whole machine is adjusted by the counterweight 13 so that the center of gravity of the whole machine is basically located on the cutting plane 6 where the working accessory 4 is located, thereby ensuring the balance of the electric circular saw 50.

[0085] like Fig.13 and Fig.14 As shown, the plane where the working attachment 4 is located is defined as the cutting plane 6, the circuit board 31 of the electric circular saw 60 is electrically connected to the first motor 3, and the circuit board 31 is passed through by the cutting plane. The circuit board 31 is arranged in a housing for combining the battery pack 34. In one embodiment, a part of the circuit board 31 is on the left side of the cutting plane, and another part of the circuit board 31 is on the right side of the cutting plane.

[0086] like Fig.15As shown, the electric circular saw 70 includes a first motor 3, and a first motor shaft 30 of the first motor 3 is substantially parallel to the cutting plane 6 of the working attachment 4. At least a portion of the first motor 3 is disposed in the grip portion 2, and one end of the first motor shaft 30 is a first gear 821, which meshes with a second gear 822, and the second gear 822 drives the second shaft 823 to rotate, and one end of the second shaft 823 meshes with a third gear 824, and the third gear 824 drives the working attachment 4 to rotate through the output shaft 12.

[0087] like Fig.16 As shown, the electric circular saw 80 includes a first motor 3, and a first motor shaft 30 of the first motor 3 is substantially parallel to the cutting plane 6 of the working attachment 4. At least a portion of the first motor 3 is disposed in the grip portion 2, and in this embodiment, the first motor 3 is completely disposed in the grip portion 2. One end of the first motor shaft 30 is a first gear 831, the first gear 831 is meshed with a second gear 832, the second gear 832 drives the second shaft 833 to rotate, one end of the second shaft 833 is meshed with a third gear 834, and the third gear 834 drives the working attachment 4 to rotate through the output shaft 12.

[0088] Fig.17 and Fig.18 yes Fig.15 Electric circular saw 70 and Fig.16 A perspective view and a front view of an electric circular saw 80. Fig.15 and Fig.16 In the embodiment, the first motor 3 is substantially parallel to the working attachment 4, and the first motor 3 at least partially extends into the grip 2. In some embodiments, at least 50% of the length of the first motor 3 is disposed in the grip 2. In some embodiments, at least 70% of the length of the first motor 3 is disposed in the grip 2. In some embodiments, at least 85% of the length of the first motor 3 is disposed in the grip 2. In some embodiments, the length of the first motor 3 is completely disposed in the grip 2. The length direction here refers to the axial direction along the first motor shaft 30. In this arrangement, the first motor 3 is hidden in the handle 2, so that the space on the right side of the working attachment of the electric circular saw 70 and the electric circular saw 80 is greatly released.

[0089] Figures 19 to 24A reciprocating saw 90 among cutting tools is disclosed. The reciprocating saw 90 includes a clamping assembly 91 for mounting a working accessory, wherein the working accessory here generally refers to a long saw blade. The working accessory is mounted on the clamping assembly 91 and performs reciprocating motion with the clamping assembly 91. The reciprocating saw 90 also includes a support frame 92, which is arranged on the outside of the clamping assembly 91 and is used to abut against the object to be cut. The reciprocating saw 90 also includes a gripping portion 2 for a user to hold. In addition, the reciprocating saw 90 also includes a transmission assembly 95 and a battery pack 94, which provides energy supply, and the battery pack 94 can partially extend into the gripping portion 2. A first motor 3 is also arranged in the gripping portion 2, and the first motor 3 is used to drive the transmission assembly 95 to move. The reciprocating saw 90 also includes a control panel 31, which is used to control the operation of the first motor 3, and the control panel 31 is arranged between the first motor 3 and the battery pack 94. The reciprocating saw 90 includes a housing 21, and a gripping portion 2 is formed on the housing 21.

[0090] The transmission assembly 95 includes a first sleeve 951 and a second sleeve 954. The first sleeve 951 is sleeved on the outside of the second sleeve 954. A first track 9542 is provided on the outside of the second sleeve 954. The first sliding pin 956 can slide in the first track 9542, that is, one end of the first sliding pin 956 abuts against the first track 9542, and the other end abuts against the inner wall of the first sleeve 951. The first sleeve 951 is provided with an anti-fool structure, so that when the first sleeve 951 is set in the housing 21, the first sleeve 951 and the housing 21 do not rotate.

[0091] A slide bar 957 is arranged in the second sleeve 954, and a second track 9571 is arranged on the outer periphery of the slide bar 957. The second slide pin 955 slides on the second track 9571, and one end of the second slide pin 955 abuts against the second track 957, and the other end is embedded in the opening 9541 of the second sleeve 954. The outer gear 952 is meshed with the planetary gear 953, and the planetary gear 953 is directly driven by the motor shaft of the first motor 3. Each planetary gear 953 is respectively arranged in the mounting groove 8543 of the second sleeve 954, and the rotation of the planetary gear 953 drives the second sleeve 954 to rotate, and the second slide pin 955 embedded in the opening 9541 of the second sleeve 954 drives the slide bar 957 to reciprocate along the reciprocating axis 9572. It should be noted that the slide bar 957 is separated from the outer gear 952 and the planetary gear 953, and the movement of the slide bar 957 is completely driven by the second slide pin 955.

[0092] In this embodiment, the axis direction of the first motor 3 and the axis direction of the transmission assembly 95 both move along the reciprocating axis 9572. The description of the outer diameter D and other parameters of the first motor 3 of the electric circular saw in the previous text of this application is also applicable to the reciprocating saw 90 of this embodiment, and will not be repeated here.

[0093] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. An electric circular saw, comprising: A housing (1) forming a receiving space; A grip portion (2) for a user to grip; An output shaft (12) for mounting a working accessory (4); It is characterized by further comprising: A first motor (3), comprising a first motor shaft (30) for driving the output shaft (12) to rotate, wherein the first motor shaft (30) is not parallel to the output shaft (12), and an outer diameter D of the first motor (3) is less than 45 mm; A transmission assembly (8) realizes power transmission between the first motor shaft (30) and the output shaft (12).

2. The electric circular saw according to claim 1, characterized in that: The ratio of the length L of the first motor (3) to the outer diameter D of the first motor (3) is greater than 1.

3. The electric circular saw according to claim 1, characterized in that: The axis (35) of the first motor (3) is parallel to the working attachment (4), the first motor (3) is arranged tilted upward, and the tail end of the first motor (3) faces the front section of the electric circular saw.

4. The electric circular saw according to claim 1, characterized in that: It also includes a shield (7), the working attachment (4) moves in the shield (7), the first motor (3) is located on one side of the shield (7), and the first motor (3) is projected toward a plane extending from the shield (7) to obtain a projection, and at least half of the projection is located on the shield (7).

5. The electric circular saw according to claim 1, characterized in that: The plane where the working attachment (4) is located is defined as a cutting plane (6). The electric circular saw further comprises a circuit board (31). The circuit board (31) is electrically connected to the first motor (3). The output end of the circuit board (31) and the first motor shaft (30) are located on the same side of the cutting plane (6).

6. The electric circular saw according to claim 1, characterized in that: The shield (7) is provided with a depth adjustment frame (5), the electric circular saw further comprises a circuit board (31), the circuit board (31) is electrically connected to the first motor (3), the working accessory (4) moves in the shield (7), and the circuit board (31) is located between the depth adjustment frame (5) and the shield (7).

7. The electric circular saw according to claim 1, characterized in that: The plane where the working attachment (4) is located is defined as a cutting plane (6), and the distance from the center line (9) of the gripping portion (2) to the cutting plane (6) is less than or equal to 30 mm.

8. The electric circular saw according to claim 1, characterized in that: The plane where the working attachment (4) is located is defined as a cutting plane (6), the distance between the center of gravity G of the electric circular saw and the cutting plane (6) is less than or equal to 30 mm, and the center of gravity G of the electric circular saw is located on either side of the cutting plane (6).

9. The electric circular saw according to claim 1, characterized in that: The transmission assembly (8) comprises a first bevel gear (81) and a second bevel gear (82) meshing with each other, the first bevel gear (81) being arranged at the output end of the first motor shaft (30), the second bevel gear (82) being arranged on the output shaft (12), the first motor shaft (30) being parallel to the working accessory (4), or the first motor shaft (30) being arranged obliquely relative to the working accessory (4).

10. The electric circular saw according to claim 1, characterized in that: It also includes a second motor (32), the second motor (32) including a second motor shaft (321) for driving the output shaft (12) to rotate, and the outer diameter D of the second motor (32) is less than 45 mm.

11. The electric circular saw according to claim 1, characterized in that: The plane where the working attachment (4) is located is defined as a cutting plane (6). The electric circular saw further comprises a circuit board (31). The circuit board (31) is electrically connected to the first motor (3), and the cutting plane passes through the circuit board (31).

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