Chainsaw

Abstract

A chainsaw, comprising: a main-unit housing having a front portion, a rear portion, and an intermediate portion between the front portion and the rear portion; and a battery pack attached to the rear portion of the main-unit housing and supplying power to at least an electric motor, wherein when the battery pack is attached to the main-unit housing and the chainsaw is stably placed, the orthographic projection of the whole chainsaw is observed in an up-down direction, and in a front-rear direction, the ratio of the overlap length L1 between the battery pack and the main-unit housing to the length L2 of the main-unit housing is greater than or equal to 0.3.

Description

chainsaw

[0001] This application claims priority to Chinese patent applications filed on November 14, 2024, application number 202411632492.6 and October 13, 2025, application number 202522165368.X, and Chinese patent application filed on October 13, 2025, application number 202511460854.2, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to a power tool, such as a chainsaw. Background Technology

[0003] A chainsaw, a type of power tool, specifically a handheld power tool, is widely used in homes, gardens, and other fields. A chainsaw uses a chain mounted on a guide plate to trim trees and branches. Also known as a pruning machine, a chainsaw is typically driven by a motor. Through a transmission mechanism, a speed reducer drives a sprocket to rotate, which in turn drives the chain along the guide plate to perform the cutting operation. Currently, the increasing demand for power tools from individuals and households, coupled with the growing precision required for processing tasks, has also increased the demand for small and medium-sized power tools.

[0004] This section provides background information related to this application, which is not necessarily prior art. Summary of the Invention

[0005] This application solves or at least mitigates some or all of the aforementioned problems. Therefore, this application provides a compact chainsaw.

[0006] One embodiment provides a chainsaw comprising: a main housing having a front portion, a rear portion, and an intermediate portion between the front and rear portions; a motor housed within the intermediate portion of the main housing; a guide plate extending at least partially from the front portion of the main housing and extending forward; a chain guided by the guide plate to perform cutting operations; and a battery pack attached to the rear portion of the main housing for powering at least the motor; wherein, when the battery pack is attached to the main housing and the chainsaw is stably positioned, when the chainsaw is viewed in a vertical direction by orthographic projection, the ratio of the overlap length L1 of the battery pack and the main housing to the length L2 of the main housing in the front-back direction is greater than or equal to 0.3.

[0007] In some embodiments, a handle is also included, at least part of which is formed or connected to the rear of the main housing. When the chainsaw is placed stably, when the chainsaw is viewed in the vertical direction by orthographic projection, the ratio of the overlap length L3 of the handle and the battery pack to the length L4 of the handle is greater than or equal to 0.5 in the front-to-back direction.

[0008] In some embodiments, when the chainsaw is stably positioned, at least part of the handle is located above the battery pack.

[0009] In some embodiments, when the chainsaw is stably positioned, the front of the main housing is positioned in front of the rear.

[0010] In some embodiments, the handle also includes a start switch that controls at least the starting of the motor. The start switch includes a switching element and a trigger portion that is operated by the user. In the front-rear direction, the trigger portion at least partially overlaps with the battery pack.

[0011] In some embodiments, when the chainsaw is viewed by orthographic projection along the vertical direction, the center line of the handle is basically coincident with the center line of the battery pack.

[0012] In some embodiments, a circuit board assembly is also included, which is disposed in the middle and at least partially above the motor.

[0013] In some embodiments, the main housing is provided with a battery pack attachment portion to which the battery pack is detachably attached.

[0014] In some embodiments, the battery pack junction also has a guide structure that guides the battery pack to the main housing along a first straight line; the first straight line is substantially parallel to the center line of the guide plate.

[0015] In some embodiments, the nominal voltage of the battery pack is greater than or equal to 20V.

[0016] One embodiment provides a chainsaw comprising: a main housing having a front portion, a rear portion, and an intermediate portion between the front and rear portions; a motor housed within the intermediate portion of the main housing; a guide plate extending at least partially from the front portion of the main housing and extending forward; a chain guided by the guide plate to perform cutting operations; a battery pack detachably attached to the rear portion of the main housing and supplying power to at least the motor; the battery pack itself defining a center of gravity G1; wherein, when the battery pack is not attached to the main housing, the chainsaw defines a bare machine center of gravity G2; when the battery pack is attached to the main housing, when the chainsaw is viewed in orthographic projection along the left-right direction, the line connecting the center of gravity G1 of the battery pack and the bare machine center of gravity G2 is substantially parallel to the centerline of the guide plate.

[0017] In some embodiments, the bare machine's center of gravity G2 is located below the motor shaft of the motor.

[0018] In some embodiments, a handle portion is also included, at least a portion of which is formed or attached to the rear of the main housing, and at least a portion of which is located above the battery pack.

[0019] In some embodiments, the handle also includes a start switch that controls at least the starting of the motor. The start switch includes a switching element and a trigger portion that is operated by the user. In the front-rear direction, the trigger portion at least partially overlaps with the battery pack.

[0020] In some embodiments, the trigger portion extends at least partially beyond the surface of the handle housing, and the extended portion of the trigger portion intersects with the handle housing, including a front intersection point relatively close to the front and a rear intersection point on the other side. A straight line extending in the vertical direction and passing through the front intersection point is defined as the axis of symmetry, and the center of gravity G1 of the battery pack is symmetrical to the center of gravity G2 of the bare unit about the axis of symmetry.

[0021] In some embodiments, when the chainsaw is viewed by orthographic projection along the left-right direction, the line connecting the front intersection point, the center of gravity G1 of the battery pack, and the center of gravity G2 of the bare machine forms a triangle. The line connecting the front intersection point and the center of gravity G1 of the battery pack, and the line connecting the front intersection point and the center of gravity G2 of the bare machine form the two sides of the triangle.

[0022] In some embodiments, when the battery pack is attached to the main housing, the chainsaw has a center of gravity G3. When the chainsaw is viewed in orthographic projection along the left and right directions, the center of gravity G3 is located below the trigger section.

[0023] In some embodiments, the axis of symmetry is located behind the motor.

[0024] In some embodiments, the main housing is provided with a battery pack coupling portion, which forms a guide structure that guides the battery pack to the main housing along a first straight line direction; the first straight line direction in which the battery pack is coupled to the housing is substantially parallel to the center line of the guide plate.

[0025] In some embodiments, the nominal voltage of the battery pack is greater than or equal to 20V. Attached Figure Description

[0026] Figure 1 is a schematic diagram of the structure of a chainsaw according to an embodiment of this application;

[0027] Figure 2 is a schematic diagram of the internal structure of a chainsaw according to an embodiment of this application;

[0028] Figure 3 is a schematic diagram of a chainsaw according to an embodiment of this application;

[0029] Figure 4 is a schematic diagram of a chainsaw according to an embodiment of this application from another perspective;

[0030] Figure 5 is a schematic diagram of the battery pack of a chainsaw according to an embodiment of this application being disassembled. Detailed Implementation

[0031] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0032] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0033] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0034] In this application, the terms "connection," "combination," "coupling," and "installation" can 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 the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0035] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, %, 1% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 1 degree, 1 degree or more) added to or subtracted from the indicated angle.

[0036] In this application, those skilled in the art will understand 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.

[0037] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0038] Figure 1 is a schematic diagram of a power tool disclosed in this application. The power tool involved in this application can be a cutting tool, a grinding tool, or a trimming tool. In this embodiment, the power tool is a chainsaw 100. As shown in Figures 1 and 2, the chainsaw 100 includes a main housing 10, a guide plate 20, a chain 30, and a motor 40. Figure 1 also defines the front, rear, upper, lower, left, and right directions in this application.

[0039] In this embodiment, the chainsaw 100 is a compact chainsaw, or what is known in the industry as a one-handed chainsaw, characterized by its small size and light weight. Under normal use, it can be held with one hand to cut most objects. Compared to medium and large chainsaws, the one-handed chainsaw offers more precise machining and is lighter, making it suitable for handling targets at heights. In this embodiment, the rated power of the chainsaw 100 is approximately 900W.

[0040] The main housing 10 has a front portion 111, a rear portion 112, and an intermediate portion 113 between the front portion 111 and the rear portion 112, and a receiving space is formed within the main housing 10. A guide plate 20 extends at least partially from the front portion 111 of the main housing 10 and extends forward. For example, a portion of the rear end of the guide plate 20 is located within the front portion 111 of the main housing 10, while the majority of the remaining portion extends outside the front portion 111 of the main housing 10. A chain 30 is a functional component of the chainsaw 100, a cutting chain. The guide plate 20 supports the chain 30 arranged around its periphery and guides the chain 30, which is driven by a motor 40 to move around the guide plate 20 to cut into the workpiece. In some embodiments, the chainsaw 100 also includes a cover detachably connected to the front portion 111 of the main housing 10, the cover accommodating a portion of the guide plate 20 and the chain 30, and providing protection for the chain 30 itself and for user safety.

[0041] In this embodiment, the main housing 10 may include a left main housing 114 and a right main housing 115, which can be joined together. As shown in FIG2, the motor 40 is housed in the middle portion 113 of the main housing 10. The motor 40 may also be housed in the middle portion 113 of the right main housing 115. After the motor shaft 41 of the motor 40 rotates, it can directly or indirectly drive the chain 30 to move around the guide plate 20 for cutting operations via a transmission assembly. As shown in FIG2 and FIG3, the central axis of the motor shaft 41 is the motor axis 401, which is substantially perpendicular to the guide plate 20. In some embodiments, the motor 40 is a brushless DC motor to reduce the size of the motor 40 while maintaining its performance. The transmission assembly includes, but is not limited to, one or more gears, belt drives, friction drives, or any combination thereof. Such transmission assemblies can also be used to selectively drive the drive chain 30 at one or more speeds.

[0042] The chainsaw 100 includes a power supply. In this embodiment, the power supply is a DC power supply. The DC power supply provides electrical energy to the chainsaw 100. Exemplarily, the DC power supply is a battery pack 50, which, in conjunction with a corresponding power circuit, supplies power to the chainsaw 100. Those skilled in the art should understand that the power supply is not limited to scenarios using DC power; it can also be powered by mains power or AC power, in conjunction with corresponding rectification, filtering, and voltage regulation circuits, to power corresponding components within the machine. In the following description, the battery pack 50 will be used instead of the power supply, but this should not be construed as a limitation of the invention.

[0043] In this embodiment, the battery pack 50 provides a nominal voltage of greater than or equal to 20V and less than or equal to 120V. In some embodiments, the nominal voltage of the battery pack 50 is 24V, 36V, 48V, 56V, or 80V, 120V. In some embodiments, the battery pack 50 may be a lithium battery pack, a solid-state battery pack, or a pouch battery pack. In some embodiments, the battery pack 50 includes lithium iron phosphate cells. In some embodiments, the battery pack 50 disclosed in this application includes ternary material cells. In some embodiments, the battery pack 50 may also be a supercapacitor, also known as an electrochemical capacitor. The nominal voltage typically refers to the voltage specified by the manufacturer or distributor on the labels, packaging, user manuals, instructions, advertisements, marketing materials, or other supporting documents of these products, so that users know which products and battery packs can operate interchangeably. Alternatively, the nominal voltage of the battery pack 50 can also be obtained by detection or calculation.

[0044] The battery pack 50 is attached to the rear portion 112 of the main housing 10, providing power to at least the motor 40. As shown in FIG. 5, the rear portion 112 of the main housing is provided with a battery pack coupling portion 12, to which the battery pack 50 is detachably attached. The battery pack coupling portion 12 also forms a guide structure 121 for guiding the battery pack 50 to engage with the main housing 10 along a first straight line 102. The battery pack coupling portion 12 also includes a locking portion 122 for retaining the battery pack 50 in the battery pack coupling portion 12, and for unlocking the battery pack 50 from the main housing 10 when it is necessary to remove the battery pack 50.

[0045] As shown in Figure 3, when the battery pack 50 is attached to the main housing 10 and the chainsaw 100 is stably positioned, a frontal projection of the entire chainsaw 100 along the vertical direction reveals that, in the front-to-back direction, the ratio of the overlap length L1 of the battery pack 50 and the main housing 10 to the length L2 of the main housing 10 is greater than or equal to 0.3. In some embodiments, the ratio of the overlap length L1 of the battery pack 50 and the main housing 10 to the length L2 of the main housing 10 is greater than or equal to 0.4. The ratio of the overlap length L1 of the battery pack 50 and the main housing 10 to the length L2 of the main housing 10 is greater than or equal to 0.5. The ratio of the overlap length L1 of the battery pack 50 and the main housing 10 to the length L2 of the main housing 10 is greater than or equal to 0.6.

[0046] The battery pack 50 has a length dimension L5, a width dimension, and a height dimension. The length dimension L5 of the battery pack 50 is greater than the width dimension, and the length dimension L5 of the battery pack 50 is greater than the height dimension. The length dimension L5 of the battery pack 50 is greater than or equal to the overlap length L1 between the battery pack 50 and the main unit housing 10. For example, when the battery pack 50 is attached to the main unit housing 10, a portion of the battery pack 50 is exposed outside the main unit housing 10 along its length direction; in this case, the length dimension L5 of the battery pack 50 is greater than the overlap length L1 between the battery pack 50 and the main unit housing 10. For example, when the battery pack 50 is attached to the main unit housing 10, the battery pack 50 does not extend beyond the outer side of the main unit housing 10 along its length direction; in this case, the length dimension L5 of the battery pack 50 is equal to the overlap length L1 between the battery pack 50 and the main unit housing 10. Optionally, the length of the portion of the main unit housing 10 that does not overlap with the battery pack 50 is L6, and the ratio of the length dimension L5 of the battery pack 50 to the length L6 of the portion that does not overlap with the battery pack 50 is greater than or equal to 0.8 and less than or equal to 1.5.

[0047] In some embodiments, when the battery pack 50 is attached to the main housing 10, the length of the assembly of the battery pack and the main housing constitutes the main housing length L7, wherein L7 is the sum of the length dimension L5 of the battery pack 50 and the length L6 of the portion not overlapping with the battery pack 50. In some embodiments, L7 is greater than L2, in which case, when the battery pack 50 is attached to the main housing 10, a portion of the battery pack 50 is exposed outside the main housing 10 in the length direction of the battery pack 50. In some embodiments, L7 is equal to L2, in which case, when the battery pack 50 is attached to the main housing 10, the battery pack 50 does not extend beyond the outside of the main housing 10 in the length direction of the battery pack 50. In some embodiments, when the battery pack 50 is attached to the main housing 10 and the chainsaw 100 is stably placed, and the chainsaw 100 is viewed by orthographic projection in the vertical direction, the ratio of the overlap length L1 of the battery pack 50 and the main housing 10 to the main housing length L7 in the front-back direction is greater than or equal to 0.3. In some embodiments, when the battery pack 50 is attached to the main housing 10 and the chainsaw 100 is stably placed, and the entire chainsaw 100 is observed in orthographic projection along the vertical direction, the ratio of the overlap length L1 of the battery pack 50 and the main housing 10 to the length L7 of the main housing in the front-back direction is greater than or equal to 0.4. In some embodiments, when the battery pack 50 is attached to the main housing 10 and the chainsaw 100 is stably placed, and the entire chainsaw 100 is observed in orthographic projection along the vertical direction, the ratio of the overlap length L1 of the battery pack 50 and the main housing 10 to the length L7 of the main housing in the front-back direction is greater than or equal to 0.5. In some embodiments, when the battery pack 50 is attached to the main housing 10 and the chainsaw 100 is stably placed, and the entire chainsaw 100 is observed in orthographic projection along the vertical direction, the ratio of the overlap length L1 of the battery pack 50 and the main housing 10 to the length L7 of the main housing in the front-back direction is greater than or equal to 0.6.

[0048] In this embodiment, the first straight line 102 connecting the battery pack 50 to the main housing 10 is substantially parallel to the center line 201 of the guide plate 20. In this embodiment, when the chainsaw 100 is stably positioned, the direction of the first straight line 102 is substantially parallel to the front-back direction, and the direction of the center line 201 of the guide plate 20 is also substantially parallel to the front-back direction. That is, the battery pack 50 enters the battery pack connection portion 12 substantially along the front-back direction. The battery pack connection portion 12 is located below the rear portion 112 of the main housing 10. In this embodiment, the nominal voltage of the battery pack 50 is greater than or equal to 20V. Compared to chainsaws 100 using battery packs with nominal voltages less than 20V in the prior art, the length L5, width, and height of the battery pack 50 are all increased. Using a high-voltage platform battery pack 50 improves the cutting ability and extends the operating time of the single-handed chainsaw 100. However, due to the large size of the battery pack 50 on the high-voltage platform, using the existing arrangement of the battery pack 50 on the low-voltage platform would increase the overall size of the chainsaw 100, making one-handed operation difficult. In this application, by adjusting the layout of the chainsaw 100 and increasing the overlap between the battery pack 50 and the main housing 10, the ratio of the overlap length L1 of the battery pack 50 to the length L2 of the main housing 10 in the front-back direction is greater than or equal to 0.3 when the chainsaw 100 is viewed in orthographic projection along the vertical direction, ensuring the compactness of the overall size. In this embodiment, taking a nominal voltage of 56V for the battery pack 50 as an example, the length L5 of the battery pack 50 is approximately 180mm. In this embodiment, the length of the main housing 10 is less than or equal to 360mm. In some embodiments, the length of the main housing 10 is less than or equal to 350mm. In some embodiments, the length of the main housing 10 is less than or equal to 340mm. In some embodiments, the length of the main housing 10 is less than or equal to 330mm. In some embodiments, the length of the main unit housing 10 is less than or equal to 320 mm.

[0049] It should be explained that when the chainsaw 100 is placed stably, the front part 111 of the main housing 10 is positioned in front of the rear part 112. That is, when the chainsaw 100 is placed stably, the guide plate 20 is in front of the entire chainsaw 100, and the battery pack 50 is behind the entire chainsaw 100. Here, "the chainsaw 100 is placed stably" is defined as the chainsaw 100 being able to be stably supported on a flat surface without a positioning structure, such as a smooth tabletop or ground, without relying on external forces. In other words, when the chainsaw 100 is placed on a flat surface, without external force assistance, or without any other external environmental support besides the flat surface, the chainsaw 100 can maintain a state of no shaking, no swaying, or no change in shape or position by utilizing its own support structure.

[0050] Referring again to Figures 1 through 4, the chainsaw 100 further includes a handle portion 13, at least partially formed or connected to the rear portion 112 of the main housing 10. In this embodiment, the handle portion 13 is integrally formed with the main housing 10. In some alternative embodiments, the handle portion 13 is a separate component connected to the main housing 10. As shown in Figure 3, when the chainsaw 100 is stably placed, a front-to-back view of the entire chainsaw 100 in the vertical direction shows that the ratio of the overlap length L3 of the handle portion 13 and the battery pack 50 to the length L4 of the handle portion 13 is greater than or equal to 0.5. In some embodiments, the ratio of the overlap length L3 of the handle portion 13 and the battery pack 50 to the length L4 of the handle portion 13 is greater than or equal to 0.55. In some embodiments, the ratio of the overlap length L3 of the handle portion 13 and the battery pack 50 to the length L4 of the handle portion 13 is greater than or equal to 0.6. In some embodiments, the ratio of the overlap length L3 of the handle portion 13 and the battery pack 50 to the length L4 of the handle portion 13 is greater than or equal to 0.65. In some embodiments, the ratio of the overlap length L3 of the handle portion 13 and the battery pack 50 to the length L4 of the handle portion 13 is greater than or equal to 0.7. In some embodiments, the ratio of the overlap length L3 of the handle portion 13 and the battery pack 50 to the length L4 of the handle portion 13 is greater than or equal to 0.75. In some embodiments, the ratio of the overlap length L3 of the handle portion 13 and the battery pack 50 to the length L4 of the handle portion 13 is greater than or equal to 0.8. In this embodiment, when the chainsaw 100 is stably positioned, at least a portion of the handle portion 13 is located above the battery pack 50. In this embodiment, by adjusting the layout of the entire chainsaw 100, the overlapping portion of the battery pack 50 and the main housing 10 is increased, thereby further increasing the overlap length of the battery pack 50 and the handle 13. When the entire chainsaw 100 is observed in the vertical direction by orthographic projection, the ratio of the overlap length L3 of the handle 13 and the battery pack 50 to the length L4 of the handle 13 in the front-back direction is greater than or equal to 0.5, ensuring the compactness of the overall structure of the chainsaw 100.

[0051] In this embodiment, as shown in Figures 2 and 5, the handle portion 13, the main housing 10, and the battery pack coupling portion 12 form a through hole 131 for the user's fingers to pass through. In this embodiment, the handle portion 13, the main housing 10, and the battery pack coupling portion 12 are connected sequentially to surround and form the through hole 131. The through hole 131 extends through the main housing 10 in a left-right direction. The handle portion 13 includes a handle grip portion 132 that the user actually holds. The cross-section of the handle grip portion 132 can be approximately circular or rectangular, and the centerline 103 of the handle portion 13 extends along the direction of extension of the handle grip portion 132. The angle α1 between the centerline 103 of the handle portion 13 and the front-back direction is greater than 0 degrees and less than or equal to 30°. In some embodiments, the angle α1 between the centerline 103 of the handle portion 13 and the front-back direction is greater than or equal to 10° and less than or equal to 30°. In some embodiments, the angle α1 between the centerline 103 of the handle portion 13 and the front-back direction is greater than or equal to 20° and less than or equal to 30°. As shown in Figure 3, when the chainsaw 100 is viewed by orthographic projection along the vertical direction, the center line 103 of the handle 13 is basically coincident with the center line of the battery pack 50. That is to say, the handle 13 is basically located in the middle of the battery pack 50, which also makes the chainsaw 100 more balanced when held by hand.

[0052] Referring again to Figures 1 and 2, the handle portion 13 also includes a start switch 14, which controls at least the starting of the motor 40. The start switch 14 includes a switch element 141 and a trigger portion 142 operated by the user. Along the front-rear direction, the trigger portion 142 at least partially overlaps with the battery pack 50. The trigger portion 142 is located at the front end of the handle portion 13, allowing the user to conveniently operate the start switch 14 with the same hand while holding the handle. In this embodiment, the chainsaw 100 also includes a circuit board assembly 15, with the switch element 141 connected to the circuit board assembly 15, and the circuit board assembly 15 connected to the motor 40. In this embodiment, the circuit board assembly 15 is disposed in the middle portion 113 and at least partially above the motor 40, thus compacting the overall structure of the chainsaw 100. By placing the circuit board assembly 15 in the middle portion 113 and above the motor 40, the overlap between the battery pack 50 and the main housing 10, and the overlap between the battery pack 50 and the handle portion 13, are increased, making the chainsaw 100 more compact overall.

[0053] A trigger portion 142 is disposed within the area of ​​the through hole 131. As shown in Figures 2 and 4, the trigger portion 142 extends at least partially beyond the surface of the handle portion 13 housing, and the extended portion of the trigger portion 142 intersects with the handle portion 13 housing, including a front intersection point 143 relatively close to the front and a rear intersection point 144 on the other side. In this embodiment, the start switch 14 is a trigger switch, which can be configured to control the start or stop of the motor 40, or to control the rotational speed of the motor 40. The trigger portion 142 is rotatably connected to the handle housing about the trigger shaft 145. The central axis 104 of the trigger shaft 145 is parallel to the axis 401 of the motor 40.

[0054] Due to the increased energy density and capacity requirements of the high-voltage platform battery pack 50, its weight is significantly greater than that of the traditional low-voltage platform battery pack 50. This increased weight may cause the chainsaw 100 to tilt forward or backward during use, affecting operational stability and balance. To ensure that the chainsaw 100 maintains good handheld balance and maneuverability after being equipped with the high-voltage battery pack, the center of gravity of each part of the chainsaw 100 needs to be rationally set. As shown in Figures 4 and 5, in this embodiment, the battery pack 50 has its own center of gravity G1. When the battery pack 50 is not attached to or installed on the main housing 10, the chainsaw 100 has a bare center of gravity G2. When the battery pack 50 is attached to the main housing 10, when the chainsaw 100 is observed by orthographic projection along the left and right directions, the line connecting the center of gravity G1 of the battery pack 50 and the bare center of gravity G2 is basically parallel to the center line 201 of the guide plate 20. This helps to counteract the unbalanced torque caused by the increased weight of the battery pack, thereby significantly improving the overall stability of the chainsaw 100 in the lateral and longitudinal directions, further optimizing the center of gravity of the whole machine, and reducing the difficulty of operation or fatigue caused by the shift of the center of gravity.

[0055] In this embodiment, a straight line extending vertically and passing through the front intersection point 143 is defined as the axis of symmetry 105, located behind the motor 40. The center of gravity G1 of the battery pack 50 is symmetrical to the center of gravity G2 of the bare machine about the axis of symmetry 105. Observing the chainsaw 100 in a horizontal projection along its left-right direction, the line connecting the front intersection point 143, the center of gravity G1 of the battery pack 50, and the center of gravity G2 of the bare machine forms a triangle. The lines connecting the front intersection point 143 and the center of gravity G1 of the battery pack 50, and the line connecting the front intersection point 143 and the center of gravity G2 of the bare machine, form the two sides of the triangle. In other words, the triangle formed by the lines connecting the front intersection point 143, the center of gravity G1 of the battery pack 50, and the center of gravity G2 of the bare machine is an isosceles triangle. This triangular geometry helps to distribute the load evenly in the structure, optimize the overall force flow path, and enhance the sense of balance during operation.

[0056] In some embodiments, when the battery pack 50 is attached to the main housing 10, the chainsaw 100 has a center of gravity G3. When the chainsaw 100 is viewed in orthographic projection along its left-right direction, the center of gravity G3 is located on the axis of symmetry 105. In other embodiments, when the battery pack 50 is attached to the main housing 10, the chainsaw 100 has a center of gravity G3. When the chainsaw 100 is viewed in orthographic projection along its left-right direction, the center of gravity G3 is located between the axis of symmetry 105 and a straight line extending vertically through the rear intersection point 144. That is, the center of gravity G3 is essentially located below the trigger section 142. This allows the operator to hold the chainsaw with the center of gravity closer to the position where the arm naturally hangs down, resulting in better feel and balance, and reducing fatigue during prolonged use.

[0057] In this embodiment, when the battery pack 50 is attached to the main housing 10, the chainsaw 100 has a total weight between 1.7 kg and 2 kg (approximately 3.7 lbs to 4.4 lbs). This balances the strong power requirements of the high-voltage battery pack with the portability and ease of operation of the device. In this embodiment, the central axis 104 of the trigger shaft 145 intersects the axis of symmetry 105. When the chainsaw 100 is viewed in orthographic projection along its left-right direction, the central axis 104 of the trigger shaft 145 is located on the axis of symmetry 105. This further enhances the symmetry of the entire machine in the operating direction, helping users apply operating force more naturally and accurately, thus improving the user experience.

[0058] As shown in Figure 2, the chainsaw 100 also includes a second handle portion 16 located in front of the handle portion 13, which can assist in gripping in special circumstances. Exemplarily, the second handle portion 16 is formed or connected to the middle portion 113 of the main housing 10. Exemplarily, the second handle portion 16 is integrally formed with the main housing 10. In this embodiment, the main housing 10, the handle portion 13, and the second handle portion 16 are integrally formed, and the main housing 10, the handle portion 13, and the second handle portion 16 are respectively joined by left and right housings. Exemplarily, at least a portion of the second handle portion 16 is located in front of the motor 40, and at least a portion of the second handle portion 16 is located in front of the circuit board assembly 15. Exemplarily, the second handle portion 16 forms a receiving space, and the circuit board assembly 15 is disposed within the receiving space.

[0059] As shown in Figure 3, when the chainsaw 100 is viewed in orthographic projection along the vertical direction, the guide plate 20 is located on one side of the centerline 103 of the handle portion 13. Exemplarily, the centerline 201 of the guide plate 20 is parallel to but does not coincide with the centerline 103 of the handle portion 13. The centerline 103 of the handle portion 13 is offset to one side of the centerline of the battery pack 50. As shown in Figures 2 and 3, the guide plate 20 defines a length L8 extending between the distal end 20b and the front portion 111 of the main housing 10. In other words, the length L8 of the guide plate 20 represents the exposed portion of the guide plate 20 extending from the main housing 10. In some embodiments, the length L8 of the guide plate 20 is approximately 7.8 inches (200 mm), and in some embodiments, the length L8 of the guide plate 20 is greater than or equal to 7.8 inches (200 mm) and less than or equal to 9.8 inches (250 mm).

[0060] The foregoing has shown and described 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 way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. A chainsaw, comprising: The main unit housing has a front portion, a rear portion, and an intermediate portion between the front portion and the rear portion; The motor is housed within the middle portion of the main housing; A guide plate, at least partially extending forward from the front of the main housing; The chain is guided by the guide plate to perform the cutting operation; A battery pack, attached to the rear of the main housing, powers at least the motor; When the battery pack is attached to the main housing and the chainsaw is placed stably, when the chainsaw is observed by orthographic projection along the vertical direction, the ratio of the overlap length L1 of the battery pack and the main housing to the length L2 of the main housing in the front-back direction is greater than or equal to 0.

3.

2. The chainsaw according to claim 1 further includes a handle portion, at least a portion of which is formed or connected to the rear of the main housing. When the chainsaw is placed stably, and the entire chainsaw is observed by orthographic projection in the vertical direction, the ratio of the overlap length L3 of the handle portion and the battery pack to the length L4 of the handle portion in the front-back direction is greater than or equal to 0.

5.

3. The chain saw of claim 2, wherein, When the chainsaw is placed stably, at least a portion of the handle is located above the battery pack.

4. The chain saw of claim 2, wherein, When the chainsaw is placed stably, the front of the main housing is positioned in front of the rear.

5. The chain saw of claim 2, wherein, The handle also includes a start switch, which controls at least the starting of the motor. The start switch includes a switching element and a trigger part operated by the user. In the front-back direction, the trigger part at least partially overlaps with the battery pack.

6. The chain saw of claim 2, wherein, When the chainsaw is viewed from above and below, the center line of the handle is basically coincident with the center line of the battery pack.

7. The chainsaw according to claim 1 further includes a circuit board assembly disposed in the middle portion and at least partially disposed above the motor.

8. The chain saw of claim 1, wherein, The main unit housing is provided with a battery pack connection part, and the battery pack is detachably attached to the battery pack connection part.

9. The chain saw of claim 8, wherein, The battery pack joint also has a guide structure that guides the battery pack to the main housing along a first straight line; the first straight line is substantially parallel to the center line of the guide plate.

10. The chain saw of claim 1, wherein, The nominal voltage of the battery pack is greater than or equal to 20V.

11. A chainsaw, comprising: The main unit housing has a front portion, a rear portion, and an intermediate portion between the front portion and the rear portion; The motor is housed within the middle portion of the main housing; A guide plate, at least partially extending forward from the front of the main housing; The chain is guided by the guide plate to perform the cutting operation; A battery pack, detachably attached to the rear of the main housing, powers at least the motor; the battery pack itself defines a center of gravity G1. When the battery pack is not attached to the main housing, the chainsaw has a bare machine center of gravity G2; when the battery pack is attached to the main housing, when the chainsaw is viewed in orthographic projection along the left and right directions, the line connecting the center of gravity G1 of the battery pack and the bare machine center of gravity G2 is basically parallel to the center line of the guide plate.

12. The chain saw of claim 11, wherein, The bare machine's center of gravity G2 is located below the motor shaft of the motor.

13. The chainsaw of claim 11, further comprising a handle portion, at least a portion of which is formed or connected to the rear portion of the main housing, and at least a portion of which is located above the battery pack.

14. The chain saw of claim 13, wherein, The handle also includes a start switch, which controls at least the starting of the motor. The start switch includes a switching element and a trigger part operated by the user. In the front-back direction, the trigger part at least partially overlaps with the battery pack.

15. The chain saw of claim 14, wherein, The trigger portion extends at least partially out of the surface of the handle housing. The extended portion of the trigger portion intersects with the handle housing, including a front intersection point relatively close to the front and a rear intersection point on the other side. A straight line extending in the vertical direction and passing through the front intersection point is defined as the axis of symmetry. The center of gravity G1 of the battery pack and the center of gravity G2 of the bare unit are symmetrical about the axis of symmetry.

16. The chain saw of claim 15, wherein, When the chainsaw is viewed from the left and right sides via orthographic projection, the line connecting the front intersection point, the center of gravity G1 of the battery pack, and the center of gravity G2 of the bare machine forms a triangle. The line connecting the front intersection point and the center of gravity G1 of the battery pack, and the line connecting the front intersection point and the center of gravity G2 of the bare machine, form the two sides of the triangle.

17. The chain saw of claim 15, wherein, When the battery pack is attached to the main housing, the chainsaw has a center of gravity G3. When the chainsaw is viewed from the left and right sides, the center of gravity G3 is located below the trigger section.

18. The chain saw of claim 15, wherein, The axis of symmetry is located behind the motor.

19. The chain saw of claim 11, wherein, The main housing is provided with a battery pack coupling portion, and the battery pack coupling portion forms a guide structure that guides the battery pack to be coupled to the main housing along a first straight line direction; the first straight line direction in which the battery pack is coupled to the housing is substantially parallel to the center line of the guide plate.

20. The chain saw of claim 11, wherein, The nominal voltage of the battery pack is greater than or equal to 20V.

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