Cutting tool and electric circular saw

Abstract

A cutting tool, comprising: a housing (1), forming an accommodating space; a holding portion (2) for a user to hold; an output shaft (12), configured to install a work attachment (4), wherein the work attachment (4) is configured to execute a cutting operation; a first motor (3), comprising a first motor shaft (30) configured to drive the output shaft (12) to rotate, wherein the outer diameter D of the first motor (3) is smaller than 40 mm; and a transmission assembly (8), which transmits power between the first motor shaft (30) and the output shaft (12).

Description

Cutting tools and circular saws

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 3, 2023, with application number 202311458781.4, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to an electric tool, for example, a cutting tool and an electric circular saw. Background Art

[0003] A cutting tool is 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 multi-function cutting machine, etc. The cutting tool uses working accessories such as saw blades and saw blades to perform cutting operations.

[0004] An electric circular saw typically consists of a housing, a saw blade, a guard, a base, a first motor, and a power supply. In most circular saws, the first motor is positioned perpendicular to the saw blade, making the saw large, especially in the width direction, and heavy. Furthermore, the center of gravity is far from the saw blade, resulting in poor balance.

[0005] Summary of the Invention

[0006] An object of the present application is to solve or at least alleviate a part or all of the above problems. To this end, an object of the present application is to provide a cutting tool and an electric circular saw.

[0007] A cutting tool includes: a shell forming a storage space; a grip portion for a user to hold; an output shaft configured to install a working accessory, the working accessory being configured to perform a cutting operation; a first motor including a first motor shaft configured to drive 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.

[0008] In some embodiments, the first motor shaft is non-parallel to the output shaft.

[0009] 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.

[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 or equal to 1.

[0011] In some embodiments, a ratio of the length L of the first motor to the outer diameter D of the first motor is greater than 1.5.

[0012] 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.

[0013] 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.

[0014] In some embodiments, the system further includes a shield, wherein the working attachment moves within the shield, the first motor is located on one side of the shield, and the first motor is projected toward a plane extending toward the shield to obtain a projection, and at least half of the projection is located on the shield.

[0015] In some embodiments, the plane where the working accessory is located is defined as a cutting plane, and the cutting tool 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] In some embodiments, a second motor is further included. The second motor includes a second motor shaft configured to drive the output shaft to rotate. The outer diameter D of the second motor is less than 45 mm.

[0021] In some embodiments, the plane where the working attachment is located is defined as a cutting plane, and the cutting tool further includes a circuit board, which is electrically connected to the first motor, and the circuit board is passed through by the cutting plane.

[0022] 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, configured to install work accessories; and also comprising: a first motor, comprising a first motor shaft configured to drive the output shaft to rotate, and the first motor shaft is not parallel to the output shaft, and the outer diameter D of the first motor is less than 45 mm; a transmission assembly, realizing power transmission between the first motor shaft and the output shaft.

[0023] 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.

[0024] In some embodiments, the axis of the first motor is parallel to the working attachment, the first motor is arranged to be tilted upward, and the tail end of the first motor faces the front of the electric circular saw.

[0025] In some embodiments, the system further includes a shield, wherein the working attachment moves within the shield, the first motor is located on one side of the shield, and the first motor is projected toward a plane extending toward the shield to obtain a projection, and at least half of the projection is located on the shield.

[0026] 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 electrically connected to the first motor, and the circuit board and the output end of the first motor shaft are located on the same side of the cutting plane.

[0027] In some embodiments, a depth adjustment frame is provided on the guard, the electric circular saw further comprises a circuit board electrically connected to the first motor, the working accessory moves within the guard, and the circuit board is located between the depth adjustment frame and the guard.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] In some embodiments, a second motor is further included. The second motor includes a second motor shaft configured to drive the output shaft to rotate. The outer diameter D of the second motor is less than 45 mm.

[0032] 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 electrically connected to the first motor, and the cutting plane passes through the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG1 is a view of a first motor in an electric circular saw located in a mounting cavity;

[0034] FIG2 is a schematic diagram of an electric circular saw;

[0035] FIG3 is another schematic diagram of an electric circular saw;

[0036] FIG4 is a view of a transmission assembly in an electric circular saw;

[0037] FIG5 is a side view of a first motor of an electric circular saw;

[0038] FIG6 is a side view of the electric circular saw shown in FIG2;

[0039] FIG7 is a side view of the electric circular saw shown in FIG3;

[0040] FIG8 is a schematic diagram of an electric circular saw having dual motors;

[0041] FIG9 is a schematic diagram showing the relative positions of a cutting plane and the axis of a first motor shaft in an electric circular saw;

[0042] FIG10 is another schematic diagram of an electric circular saw;

[0043] FIG11 is a schematic diagram of the interior of FIG10;

[0044] FIG12 is a schematic diagram of an electric circular saw provided with a counterweight;

[0045] FIG13 is another schematic diagram of an electric circular saw;

[0046] FIG14 is a schematic diagram of the internal structure of FIG13;

[0047] FIG15 is a schematic structural diagram of an electric circular saw;

[0048] FIG16 is a schematic structural diagram of another electric circular saw;

[0049] FIG17 is a schematic diagram of the electric circular saw shown in FIG16;

[0050] FIG18 is a front view of the electric circular saw shown in FIG17;

[0051] FIG19 is a schematic diagram of a reciprocating saw;

[0052] FIG20 is a schematic diagram of the interior of a reciprocating saw;

[0053] FIG21 is a schematic diagram of a transmission structure of a reciprocating saw;

[0054] FIG22 is a schematic diagram of the transmission structure of the reciprocating saw from another perspective;

[0055] FIG23 is a schematic diagram of the second sleeve in FIG22;

[0056] FIG24 is a schematic diagram of the reciprocating structure in FIG22 without the second sleeve. DETAILED DESCRIPTION

[0057] Before any embodiments of the present 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 foregoing drawings.

[0058] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0059] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "an electric circular saw and / or an electric circular saw" can represent three possible situations: the existence of a single electric circular saw, the existence of both a single electric circular saw and an electric circular saw, and the existence of a single electric circular saw. Furthermore, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0060] In this 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, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0061] In this application, it will be understood by those skilled 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 tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. 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).

[0062] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0063] 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 the other element "upper" or "lower", but also be indirectly connected to the other 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, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0064] Cutting tools are electric tools used for cutting. These tools can be handheld, including circular saws, reciprocating saws, and multi-purpose cutters. Cutting tools use accessories like saw blades and saw blades to perform cutting operations.

[0065] An electric circular saw 10 is a common cutting tool used in everyday life, suitable for cutting wood, fiberboard, and plastic. The working attachment of the electric circular saw 10 can be a circular saw blade, a grinding wheel, or a sanding wheel. The motor shaft of the electric motor drives the output shaft, which in turn drives the working attachment to perform tasks such as cutting and sanding.

[0066] In the prior art, due to the vertical arrangement of the motor and the heavy weight of the motor, 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 entire machine. To address the above issues, as shown in Figures 1-14, 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.

[0067] Among them, the shell 1 forms a accommodating space, and the grip 2 is connected to the tail 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 set on the shell 1, and the output shaft 12 is set to fix the working accessory 4; the first motor 3 includes a first motor shaft 30 set to drive 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 45 mm; the transmission assembly 8 is set on the shell 1, for realizing power transmission between the first motor shaft 30 and the output shaft 12.

[0068] 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.

[0069] Because the first motor shaft 30 is not parallel to the output shaft 12, the first motor 3 is tilted relative to the output shaft 12, shortening the width of the saw and placing its center of gravity closer to the surface where the work attachment 4 is located. Furthermore, by using a thin motor with an outer diameter D less than 45 mm, the overall weight of the saw is reduced, making it easier for the user to operate the saw through the grip 2. This rational structural arrangement further improves the balance of the electric circular saw 10.

[0070] As shown in Figure 1, in some embodiments, an extension portion 11 is provided at the tail end of the shell 1, and the grip portion 2 is connected to the shell 1 and the extension portion 11, and the grip portion 2, the shell 1 and the extension portion 11 form a hand-held space, and the user holds the grip portion 2 with part of the finger located in the hand-held space. The above structure can ensure that the grip portion 2 is stably connected to the shell 1. As shown in Figure 3, in some embodiments, the extension portion 11 may not be provided on the shell 1, and one end of the grip portion 2 is directly connected to the shell 1. The above structure is simple in structure and saves materials. In some embodiments, the grip portion 2 and the shell 1 are an integrated structure, which can ensure the stability of the connection between the grip portion 2 and the shell 1.

[0071] As shown in Figure 1, in some embodiments, the housing 1 has a mounting cavity for accommodating the first motor 3, and the first motor 3 is fixedly mounted in the mounting cavity. This arrangement not only conceals the first motor 3, enhancing the overall appearance of the circular saw 10, but also protects the first motor 3 from external debris or cutting debris.

[0072] 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 entire machine can be shortened, thereby adjusting the center of gravity of the entire machine to be closer to the working attachment 4. The longer length L of the first motor 3 can ensure that the output torque of the first motor 3 is larger. 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.

[0073] As shown in Figures 2 and 3 , 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 obliquely upward. As shown in Figures 4 and 5 , the first motor 3 also includes a first motor shaft 30 , which is configured to output power. The first motor 3 includes a head end 36 and a tail end 37 , which are arranged opposite 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 .

[0074] As shown in Figures 6 and 7 , a first plane 110 divides the working attachment 4 of the circular saw 10 into two equal parts along the front-to-back direction. The first plane 110 is perpendicular to the bottom plane of the depth adjustment frame 5. The circular saw 10 includes a front portion 101 and a rear portion 102. The front portion 101 is located in front of the first plane 110, and the rear portion 102 is located behind the first plane 110. In the circular saw 10, the tail end 37 of the first motor 3 faces the front portion 101 of the circular saw 10. In the circular saw 20, the tail end 37 of the first motor 3 faces the rear portion 102 of the circular saw 10. In some embodiments, the first motor 3 is located entirely at the front portion 101 of the circular saw 10. In some embodiments, the first motor 3 is located entirely at the rear portion 102 of the circular saw 20.

[0075] Through the above arrangement, the first motor 3 is parallel to the working attachment 4, further shortening the overall width of the circular saw and bringing the center of gravity closer to the working attachment 4. The tail end 37 of the first motor 3 faces the front portion 101 of the circular saw 10, indicating the end in the cutting direction of the circular saw 10. The entire first motor 3 is located in the front half of the circular saw 10, increasing the weight of the front half of the circular saw 10, thereby ensuring that the working attachment 4 is stably pressed against the object being cut when the circular saw 10 is in operation.

[0076] In some embodiments, the electric circular saw 10 further includes a guard 7, within which the working accessory 4 moves. The first motor 3 is located on one side of the guard 7, and at least half of the projection of the first motor 3 onto a plane extending toward the guard 7 is located on the guard 7. The guard 7 is made of aluminum or an aluminum alloy. The guard 7 includes a fixed portion 71 and a movable portion 72. The fixed portion 71 is connected to the housing 1, and the movable portion 72 is rotatably mounted on the fixed portion 71. The movable portion 72 extends relative to the fixed portion 71. The lower portion of the working accessory 4 is located within the movable portion 72, and a spring is disposed between the movable portion 72 and the fixed portion 71. When the working accessory 4 cuts an object, the object pushes the movable portion 72 to rotate and retract relative to the fixed portion 71. After the work is completed, the movable portion 72 extends relative to the fixed portion 71 under the action of the spring, thereby protecting the working accessory 4. Furthermore, the majority of the volume of the first motor 3 overlaps with the guard 7, ensuring that the center of gravity of the positive electrode does not exceed the height of the guard 7, thereby lowering the center of gravity of the entire machine.

[0077] As shown in Figures 2 and 9, in some embodiments, the plane on which the working attachment 4 is located is defined as a cutting plane 6. The electric circular saw 10 also includes a circuit board 31, which is electrically connected to the first motor 3. The circuit board 31 and the output end of the first motor shaft 30 are located on the same side of the cutting plane 6. In some embodiments, the bottom of the mounting box on which the circuit board 31 is mounted is in contact with the shield 7. The heat generated by the operation of the circuit board 31 is discharged through the shield 7, which facilitates the heat dissipation of the circuit board 31 and ensures that the circuit board 31 can operate normally and efficiently. In some embodiments, the circuit board 31 is a printed circuit board 31 (PCB board). In other embodiments, a PLC (programmable logic controller), an STM32 controller, or a single-chip microcomputer can also be used for control, without further limitation.

[0078] 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 via 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.

[0079] As shown in Figure 9, 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 extends basically 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-mentioned arrangement facilitates use by users, thereby ensuring the accuracy of the cutting process.

[0080] In some embodiments, the plane where the working attachment 4 is located is defined as the cutting plane 6. The center of gravity G of the electric circular saw 10 is less than or equal to 30 mm from the cutting plane 6, and can be 25 mm, 20 mm, 10 mm, etc., and the center of gravity G is located on either side of the cutting plane 6. In some embodiments, the electric circular saw 10 is equipped with a battery pack 34, which is electrically connected to the first motor 3 to provide the first motor 3 with the required power. In this case, the center of gravity G of the electric circular saw 10 is the center of gravity when the battery pack 34 is installed. In 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 via wires.

[0081] As shown in Figure 4, 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, and the second bevel gear 812 is arranged on the output shaft 12, and 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.

[0082] As shown in FIG8 , in some embodiments, the electric circular saw 25 further includes a second motor 32 , which includes a second motor shaft 321 configured to drive the output shaft 12 , and an 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 is arranged at an angle relative to the output shaft 12 , shortening the width of the entire saw and placing the center of gravity of the saw closer to the surface where the work attachment 4 is located. Furthermore, by using a thin motor with an outer diameter D of less than 45 mm, the weight of the saw 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 increased, enabling the saw to cut even harder objects. In some embodiments, three or more motors can be arranged to drive the output shaft 12 , without further limitation.

[0083] In some embodiments, the axis 35 of the first motor 3 is located at any angle to 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.

[0084] As shown in Figures 10 and 11, in some embodiments, to further reduce the distance between the center of gravity of the electric circular saw 40 and the working accessory 4, and to ensure that the axis 35 of the first motor 3 substantially coincides with the plane of the working accessory 4, the first motor 3 is connected to the output shaft 12 via a two-stage transmission assembly 8. A transmission shaft 33 can be rotatably mounted in the electric circular saw 40, with a first gear 331 and a second gear 332 fixedly mounted at each end of the transmission shaft 33. The first gear 331 is connected to the first motor shaft 30 of the first motor 3 via a gear transmission, and the second gear 332 is connected to the bevel gear on the output shaft 12, thereby achieving a two-stage transmission. In other embodiments, a chain drive or synchronous belt drive can also be used to achieve a two-stage transmission, and this is not limited here. This arrangement facilitates the placement of the first motor 3 and further improves the balance of the electric circular saw 40.

[0085] Because the first motor 3 is located to one side of the working attachment 4, even if the mounting method of the first motor 3 is adjusted, the center of gravity of the entire saw cannot be substantially located on the plane where the working attachment 4 is located. Therefore, as shown in FIG12 , 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 either side of the working attachment 4, and the battery pack 34 is placed to one side of the center of the grip 2. The counterweight 13 is used to adjust the center of gravity of the entire saw so that it is substantially located on the cutting plane 6 where the working attachment 4 is located, thereby ensuring the balance of the electric circular saw 50.

[0086] As shown in Figures 13 and 14 , the plane in which the working attachment 4 lies 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 cutting plane 6 passes through the circuit board 31. The circuit board 31 is housed within a housing for the battery pack 34. In one embodiment, a portion of the circuit board 31 is on the left side of the cutting plane, while another portion is on the right side of the cutting plane.

[0087] As shown in FIG15 , the electric circular saw 70 includes a first motor 3 , wherein 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 within the grip 2 . One end of the first motor shaft 30 is a first gear 821 , which meshes with a second gear 822 , which in turn drives a second shaft 823 . One end of the second shaft 823 meshes with a third gear 824 , which in turn drives the working attachment 4 via the output shaft 12 .

[0088] As shown in FIG16 , the electric circular saw 80 includes a first motor 3 , wherein 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 within the grip 2 . In this embodiment, the first motor 3 is entirely disposed within the grip 2 . A first gear 831 is disposed at one end of the first motor shaft 30 . The first gear 831 meshes with a second gear 832 , which in turn drives a second shaft 833 to rotate. One end of the second shaft 833 meshes with a third gear 834 , which in turn drives the working attachment 4 to rotate via the output shaft 12 .

[0089] Figures 17 and 18 are perspective and front views of the circular saw 70 in Figure 15 and the circular saw 80 in Figure 16 . In Figures 15 and 16 , the first motor 3 is substantially parallel to the working accessory 4 and at least partially extends into the handle 2. In some embodiments, at least 50% of the length of the first motor 3 is disposed within the handle 2. In some embodiments, at least 70% of the length of the first motor 3 is disposed within the handle 2. In some embodiments, at least 85% of the length of the first motor 3 is disposed within the handle 2. In some embodiments, the entire length of the first motor 3 is disposed within the handle 2. The length here refers to the direction along the axis of the first motor shaft 30. This arrangement conceals the first motor 3 within the handle 2, significantly freeing up space to the right of the working accessory of the circular saws 70 and 80.

[0090] Figures 19 to 24 illustrate a reciprocating saw 90, a type of cutting tool. The reciprocating saw 90 includes a clamping assembly 91 for mounting a work attachment, typically a long saw blade. The work attachment is mounted on the clamping assembly 91 and reciprocates with the clamping assembly 91. The reciprocating saw 90 also includes a support frame 92, which is disposed outside the clamping assembly 91 and is configured to abut against an object being cut. The reciprocating saw 90 also includes a grip 2 for the user to hold. Furthermore, the reciprocating saw 90 includes a transmission assembly 95 and a battery pack 94, which provides energy and partially extends into the grip 2. A first motor 3 is also disposed within the grip 2 and is configured to drive the transmission assembly 95. The reciprocating saw 90 also includes a control panel 31, which is configured to control the operation of the first motor 3 and is disposed between the first motor 3 and the battery pack 94. The reciprocating saw 90 includes a housing 21 on which a grip portion 2 is formed.

[0091] The transmission assembly 95 includes a first sleeve 951 and a second sleeve 954. The first sleeve 951 is sleeved outside the second sleeve 954. A first track 9542 is provided outside the second sleeve 954. A first sliding pin 956 can slide within the first track 9542. In other words, one end of the first sliding pin 956 abuts the first track 9542, and the other end abuts the inner wall of the first sleeve 951. The first sleeve 951 is provided with a foolproof structure to prevent the first sleeve 951 and the housing 21 from rotating when the first sleeve 951 is installed in the housing 21.

[0092] A sliding rod 957 is mounted within the second sleeve 954. A second track 9571 is disposed on the outer periphery of the sliding rod 957. A second sliding pin 955 slides along the second track 9571. One end of the second sliding pin 955 abuts the second track 957, while the other end engages within the opening 9541 of the second sleeve 954. The external gear 952 meshes with the planetary gears 953, which are directly driven by the motor shaft of the first motor 3. Each planetary gear 953 is mounted within a mounting slot 8543 of the second sleeve 954. Rotation of the planetary gears 953 drives the second sleeve 954. The second sliding pin 955, embedded within the opening 9541 of the second sleeve 954, drives the sliding rod 957 to reciprocate along the reciprocating axis 9572. It should be noted that the sliding rod 957 is disconnected from the external gear 952 and the planetary gears 953. The movement of the sliding rod 957 is entirely driven by the second sliding pin 955.

[0093] 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 parameters such as the outer diameter D 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.

[0094] The above shows and describes the basic principles, main features and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of this application.

Claims

1. A cutting tool, comprising: A housing (1) forming a receiving space; A grip portion (2) for a user to grip; An output shaft (12) is configured to mount a working accessory (4), wherein the working accessory (4) is configured to perform a cutting operation; A first motor (3) comprising a first motor shaft (30) configured to drive the output shaft (12) to rotate, wherein an outer diameter D of the first motor (3) is less than 40 mm; A transmission assembly (8) realizes power transmission between the first motor shaft (30) and the output shaft (12).

2. The cutting tool according to claim 1, wherein: The first motor shaft (30) is not parallel to the output shaft (12).

3. The cutting tool according to claim 1, wherein: The plane where the working attachment (4) is located is defined as a cutting plane (6), and the first motor shaft (30) is substantially parallel to the cutting plane (6).

4. The cutting tool according to claim 1, wherein: 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.

5. The cutting tool according to claim 1, wherein: 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.

5.

6. The cutting tool according to claim 1, wherein: 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.

8.

7. The cutting tool according to claim 3, wherein: The first motor (3) is arranged to be tilted upward, and the tail end (37) of the first motor (3) faces the front part (101) of the cutting tool.

8. The cutting tool according to claim 1 further comprises 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 a plane extending from the shield (7) to obtain a projection, and at least half of the projection is located on the shield (7).

9. The cutting tool according to claim 1, wherein: The plane where the working accessory (4) is located is defined as a cutting plane (6), and the cutting tool further comprises a circuit board (31), wherein 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).

10. The cutting tool according to claim 8, wherein: The shield (7) is provided with a depth adjustment frame (5), the cutting tool 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).

11. The cutting tool according to claim 1, wherein: 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.

12. The cutting tool according to claim 1, wherein: The plane where the working accessory (4) is located is defined as the cutting plane (6), the distance between the center of gravity G of the cutting tool and the cutting plane (6) is less than or equal to 30 mm, and the center of gravity G of the cutting tool is located on any side of the cutting plane (6).

13. The cutting tool according to claim 1, wherein: The transmission assembly (8) comprises a first bevel gear (811) and a second bevel gear (812) meshing with each other, the first bevel gear (811) being arranged at the output end of the first motor shaft (30), the second bevel gear (812) 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).

14. The cutting tool according to claim 1, further comprising a second motor (32), wherein the second motor (32) comprises a second motor shaft (321) configured to drive the output shaft (12) to rotate, and an outer diameter D of the second motor (32) is less than 45 mm.

15. The cutting tool according to claim 1, wherein: The plane where the working attachment (4) is located is defined as a cutting plane (6), and the cutting tool further comprises a circuit board (31), wherein the circuit board (31) is electrically connected to the first motor (3), and the circuit board (31) is passed through by the cutting plane.

16. 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) is configured to mount a working accessory (4); A first motor (3) comprising a first motor shaft (30) configured to drive 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).

17. The electric circular saw according to claim 16, wherein: 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.

18. The electric circular saw according to claim 16, wherein: 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.

19. The electric circular saw according to claim 16, further comprising a guard (7), the working accessory (4) moving inside the guard (7), the first motor (3) being located on one side of the guard (7), and the first motor (3) being projected toward a plane extending from the guard (7) to obtain a projection, and at least half of the projection being located on the guard (7).

20. The electric circular saw according to claim 16, wherein: 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).

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