Chain saw

Abstract

The utility model discloses a chain saw. According to the chain saw, tensioning operation of the chain is facilitated, and tools are not needed; compared with an existing structure, the weight and the size of the tensioning device are reduced, then the size of the chain cover is reduced, and the production cost is reduced.

Description

Technical Field

[0001] This application relates to a power tool, specifically a chainsaw. Background Technology

[0002] Chainsaws, as a type of garden power tool, are widely used in homes, gardens, and other fields. A chainsaw is a garden tool that uses a power unit to drive the interlaced L-shaped blades on the chainsaw to move laterally to cut wood or branches.

[0003] For chainsaws in related technologies, the chain tension needs to be adjusted by changing the position of the chain guide plate before use. Currently, the chain guide plate tensioning methods for chainsaws basically include tool tensioning and tool-less tensioning. Tool tensioning has advantages such as compact structure and good anti-backlash effect, but it is complex to operate and requires tools. Tool-less tensioning has advantages such as simple operation, but it has more parts, a more complex structure, and a larger overall chain cover size. Summary of the Invention

[0004] One object of this application is to solve or at least alleviate some or all of the aforementioned problems. Therefore, one object of this application is to provide a chainsaw.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] Firstly, a chainsaw is provided, comprising:

[0007] Tool body;

[0008] The motor is located inside the tool body;

[0009] Chain guide plate, configured to support the chain;

[0010] The tensioning system, mounted on the tool body, is operated to adjust the tension of the chain;

[0011] The tensioning system includes:

[0012] The adjustment knob is operated to adjust the tension force;

[0013] The tensioning device, connected to the chain guide plate, is configured to adjust the tension force in response to the rotation of the adjustment knob;

[0014] The tensioning device includes a flexible shaft.

[0015] In some embodiments, at least the tensioning device connected to the adjustment knob is configured as the flexible shaft.

[0016] In some embodiments, the tensioning system further includes a chain cover mounted on the tool body, an adjustment knob disposed on the chain cover, and a tensioning device mounted on the inner side of the chain cover.

[0017] In some embodiments, the maximum thickness of the chain cover is less than or equal to 40 mm in the direction perpendicular to the plane of the chain guide plate.

[0018] In some embodiments, the weight of the chain cover is 145g-155g.

[0019] In some embodiments, the tensioning device includes a tensioning shaft and a tensioning pin, the tensioning shaft being operable to rotate with rotation of the adjustment knob, one end of the tensioning pin being threaded onto the tensioning shaft and the other end being connected to the chain guide plate, the tensioning shaft being at least partially configured as the flexible shaft.

[0020] In some embodiments, the ratio of the length of the flexible shaft to the length of the tensioning shaft is less than or equal to 1.

[0021] In some embodiments, the length of the flexible shaft is at least 20mm-30mm.

[0022] In some embodiments, the tensioning shaft further includes a lead screw, and the tensioning pin is connected to the lead screw.

[0023] In some embodiments, the flexible shaft is press-fitted to the lead screw.

[0024] In some embodiments, the connection method between the flexible shaft and the adjustment knob includes one of press-fit connection, injection molding connection, and die casting connection.

[0025] The advantages of this application are:

[0026] The chainsaw provided in this application has a tensioning system mounted on the tool body that is operated to adjust the chain tension. The tensioning system includes an adjustment knob and a tensioning device. Rotating the adjustment knob adjusts the tension, which is convenient to operate and does not require tools. The tensioning device is connected to the chain guide plate and is configured to adjust the tension in response to the rotation of the adjustment knob. The tensioning device includes a flexible shaft. The force of rotating the adjustment knob is transmitted to the chain guide plate through the flexible shaft. The tensioning device changes the direction of the force, thereby achieving chain tension. Compared with the existing structure, the weight and size of the tensioning device are reduced, which in turn reduces the size of the chain cover and lowers production costs.

[0027] Secondly, a chainsaw is provided, comprising:

[0028] Tool body;

[0029] The motor is located inside the tool body;

[0030] Chain guide plate, configured to support the chain;

[0031] The tensioning system, mounted on the tool body, is operated to adjust the tension of the chain;

[0032] The tensioning system includes:

[0033] The adjustment knob is operated to adjust the tension force;

[0034] The tensioning device, connected to the chain guide plate, is configured to adjust the tension force in response to the rotation of the adjustment knob;

[0035] The adjustment knob and the tensioning device are flexibly connected.

[0036] In some embodiments, the tensioning device includes a tensioning shaft and a tensioning pin, the tensioning shaft being operable to rotate with the rotation of the adjustment knob, one end of the tensioning pin being threaded onto the tensioning shaft and the other end being connected to the chain guide plate, the tensioning shaft being at least partially configured as a flexible shaft.

[0037] In some embodiments, the tensioning shaft further includes a lead screw, and the tensioning pin is connected to the lead screw.

[0038] The advantages of this application are:

[0039] The chainsaw provided in this application has a tensioning system mounted on the tool body that is operated to adjust the chain tension. The tensioning system includes an adjustment knob and a tensioning device. Rotating the adjustment knob adjusts the tension, which is convenient to operate and does not require tools. The tensioning device is connected to the chain guide plate and is configured to adjust the tension in response to the rotation of the adjustment knob. There is a flexible connection between the adjustment knob and the tensioning device. Compared with the existing structure, the weight and size of the tensioning device are reduced, thereby reducing the size of the chain cover and lowering production costs.

[0040] Thirdly, a chainsaw is provided, comprising:

[0041] Tool body;

[0042] The motor is located inside the tool body;

[0043] Chain guide plate, configured to support the chain;

[0044] The tensioning system, mounted on the tool body, is operated to adjust the tension of the chain;

[0045] The tensioning system includes:

[0046] The adjustment knob is operated to adjust the tension force;

[0047] The tensioning device, connected to the chain guide plate, is configured to adjust the tension force in response to the rotation of the adjustment knob;

[0048] The rotational force generated by rotating the adjustment knob is transmitted to the tensioning device along the curved direction.

[0049] In some embodiments, at least the tensioning device connected to the adjustment knob is configured as a flexible shaft.

[0050] The advantages of this application are:

[0051] The chainsaw provided in this application has a tensioning system mounted on the tool body that is operated to adjust the tension of the chain. The tensioning system includes an adjustment knob and a tensioning device. Rotating the adjustment knob adjusts the tension, which is convenient to operate and does not require tools. The tensioning device is connected to the chain guide plate and is configured to adjust the tension in response to the rotation of the adjustment knob. The rotational force generated by the rotation of the adjustment knob is transmitted to the tensioning device along a curved direction, changing the direction of force transmission and achieving chain tensioning. This simplifies the structure and reduces production costs.

[0052] Fourthly, a chainsaw is provided, comprising:

[0053] Tool body;

[0054] The motor is located inside the tool body;

[0055] Chain guide plate, configured to support the chain;

[0056] The first tensioning system, detachably mounted on the tool body, is operated to adjust the tension of the chain using an external tool;

[0057] The second tensioning system, detachably mounted on the tool body, is operated to adjust the tension of the chain;

[0058] The second tensioning system includes:

[0059] An adjustment knob that can be operated to adjust the tension;

[0060] The tensioning device, connected to the chain guide plate, is configured to adjust the tension force in response to the rotation of the adjustment knob;

[0061] The tensioning device includes a flexible shaft.

[0062] In some embodiments, the second tensioning system further includes a chain cover mounted on the tool body, an adjustment knob disposed on the chain cover, and a tensioning device mounted inside the chain cover.

[0063] The advantages of this application are:

[0064] The chainsaw provided in this application is equipped with a first tensioning system and a second tensioning system. The first tensioning system is a tool-operated tensioning structure, while the second tensioning system is a tool-free tensioning structure. Users can install different tensioning systems onto the tool body according to their needs, providing high flexibility in use. In addition, the tensioning force of the second tensioning system can be adjusted by rotating the adjustment knob and the tensioning device, which is convenient to operate and does not require tools. The tensioning device includes a flexible shaft, which reduces the weight and size of the tensioning device compared to existing structures, thereby reducing the size of the chain cover and lowering production costs. Attached Figure Description

[0065] Figure 1 This is a top view of a chainsaw according to an embodiment of this application;

[0066] Figure 2 This is a bottom view of a chainsaw according to an embodiment of this application;

[0067] Figure 3 This is a schematic diagram of another structure of a chainsaw according to one embodiment of this application;

[0068] Figure 4 This is a first side view of a chainsaw according to an embodiment of this application;

[0069] Figure 5 This is a structural schematic diagram from a first-view perspective of a chainsaw according to an embodiment of this application when it is suspended.

[0070] Figure 6 This is a structural schematic diagram from a second perspective of a chainsaw according to an embodiment of this application when it is suspended.

[0071] Figure 7 This is a second side view of a chainsaw according to an embodiment of this application;

[0072] Figure 8a This is an isometric schematic diagram of the structure of the chain cover, tensioning device and adjusting knob according to an embodiment of this application;

[0073] Figure 8b This is a cross-sectional view of the structure of the chain cover, tensioning device, and adjusting knob according to an embodiment of this application;

[0074] Figure 9 This is a schematic diagram of the structure of a chip-blocking rib according to an embodiment of this application;

[0075] Figure 10 This is a first-view structural schematic diagram of the shielding rib position according to an embodiment of this application;

[0076] Figure 11This is a structural schematic diagram of the shielding rib position from a second perspective according to an embodiment of this application;

[0077] Figure 12 This is a schematic diagram of the structure of a chainsaw placed on a plane without a battery pack installed, according to one embodiment of this application;

[0078] Figure 13 This is a schematic diagram of the installation structure of an oil pump according to an embodiment of this application;

[0079] Figure 14 This is a schematic diagram of the installation structure of the fuel tank according to one embodiment of this application.

[0080] In the picture:

[0081] 1. Tool body; 2. Actuator; 21. Chain guide plate; 22. Chain; 3. Battery pack; 4. First handle; 5. Second handle; 6. Battery mounting part; 7. Suspension part; 8. Tensioning system; 81. Adjustment knob; 82. Tensioning device; 821. Flexible shaft; 822. Tensioning shaft; 823. Tensioning pin; 83. Chain cover; 84. Pressure knob; 9. Chip guard; 10. Brake baffle; 11. Protective rib position; 12. Oil pump; 13. Oil inlet pipe; 14. Oil outlet pipe; 15. Oil tank; 16. Power supply mounting part; 17. Power conversion device; 18. Portable power supply; 181. First battery pack; 182. Backpack assembly; 183. Power cord. Detailed Implementation

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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%, 5%, 10% or more) of the indicated value. Numerical values ​​not using 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, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0087] 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.

[0088] 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.

[0089] In this application, the terms "controller," "processor," "central processing unit," "CPU," and "MCU" are used interchangeably. When using the unit "controller," "processor," "central processing unit," "CPU," or "MCU" to perform a specific function, unless otherwise stated, these functions may be performed by a single or multiple of the aforementioned units.

[0090] In this application, the terms "device," "module," or "unit" are used to describe devices that can be implemented in hardware or software to perform a specific function.

[0091] In this application, the terms “calculation,” “judgment,” “control,” “determine,” “identify,” etc., refer to the operation and process of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0092] This embodiment provides a handheld power tool, which can be a chainsaw, lawnmower, pruning machine, etc.

[0093] like Figure 1 and Figure 2 As shown, a handheld power tool includes a tool body 1, a battery mounting section 6, a motor, and a control circuit. The battery mounting section 6 is mounted on the tool body 1, and the battery pack 3 is mounted on the battery mounting section 6. The motor is located inside the tool body 1. The handheld power tool also includes an actuator 2. The control circuit is configured to control the start or rotation state of the motor, so that the motor drives the actuator 2 to work. Different types of handheld power tools have different structures for the actuator 2, and the functions they perform also differ.

[0094] Typically, a power tool can be powered by multiple battery packs 3 of different capacities. When different battery packs 3 are installed on the tool body 1, the center of gravity of the tool will change. For some handheld power tools, especially those with the battery pack 3 installed at the rear, if the center of gravity shifts too far backward after installing the battery pack 3, it will affect the balance of operation and may lead to some safety problems, such as the tipping of chainsaws or lawnmowers.

[0095] To address this issue, the control circuit includes a parameter detection module and a controller. The parameter detection module acquires battery communication data at least when the battery pack 3 is installed on the battery mounting section 6. After the handheld power tool is powered on, the parameter detection module first communicates with the battery pack 3 to obtain relevant information about the battery pack 3 and parses it to obtain battery communication data. The controller determines the center of gravity position of the tool body 1 after the battery pack 3 is installed based on the battery communication data. In this embodiment, the battery communication data includes at least one of the following: battery pack model, battery pack weight, battery pack capacity, and battery pack volume. That is, the battery communication data characterizes the attribute information of the battery pack 3. Different battery packs 3 installed on the tool body 1 will change the center of gravity of the entire machine. In one implementation, the center of gravity position of the power tool after different battery packs 3 are installed on the same power tool can be recorded and stored. This allows the center of gravity position of the power tool after the battery pack 3 is installed to be determined based on any attribute parameter carried in the battery communication data.

[0096] It is understood that the power tool may also include a storage device capable of storing battery pack communication data and a list of data regarding the overall center of gravity position of the machine after the battery pack 3 is installed. In this embodiment, the storage device may also store a preset center of gravity, which can be understood as a threshold value. This means that if the center of gravity position of the power tool after the battery pack 3 is installed is at the preset center of gravity, there will be no safety issues due to failure to meet balance requirements. If the center of gravity after installing the battery pack 3 changes significantly relative to the preset center of gravity, a safety issue may arise; conversely, a small change will ensure safe operation of the tool. In other words, if the change in the center of gravity position of the tool after installing the battery pack 3 relative to the preset center of gravity exceeds a threshold value, the handheld power tool may not meet the balance requirements.

[0097] In this embodiment, if the change exceeds a threshold value, the motor can be prevented from starting, thus avoiding safety risks or impacting the work performance during operation. In one implementation, battery communication data, the corresponding center of gravity position after installing the battery pack 3, and the change in that center of gravity position relative to a preset center of gravity, can be stored in the aforementioned storage device.

[0098] The controller is configured to obtain the change amount by looking up a table based on the battery communication data, and determine whether to start the motor based on the obtained change amount.

[0099] In one embodiment, the controller is configured to issue an alarm message if the change exceeds a change threshold, to alert the user that the installed battery pack 3 is incompatible with the tool body 1. The alarm message can be an audible alarm, a visual alarm, or an audible and visual alarm.

[0100] In one embodiment, the controller is configured to disconnect the power supply path between the battery pack 3 and the motor when the change exceeds a threshold, thus preventing power supply to the motor. Even if a signal to start the handheld power tool is sent to the controller, the motor will not start, and the handheld power tool will not work, ensuring user safety.

[0101] In one embodiment, the controller is configured to issue a non-start control signal when the change amount is greater than a change amount threshold, so as to control the motor not to start. Even if a signal to start the handheld power tool is sent to the controller, the motor will not start, the handheld power tool will not work, and the user's safety is guaranteed.

[0102] In one embodiment, the controller is configured not to respond to a start signal if the change exceeds a change threshold, so that the motor is not started. Even if a signal to start the handheld power tool is sent to the controller, the motor will not start, ensuring user safety.

[0103] In the above embodiments, battery communication data can ensure the capacity, weight and other attribute parameters of battery pack 3. One or more of these parameters can also characterize the type of battery pack 3. It can be understood that once the type of battery pack 3 is determined, the change in the center of gravity of the whole machine after it is installed in the power tool can be basically determined. Thus, it can be simply understood that after knowing the type of battery pack 3, it is possible to determine whether the battery pack 3 is suitable for installation in the power tool and whether it will cause safety problems due to imbalance.

[0104] In this embodiment, the controller is configured to obtain the type of battery pack 3 by looking up a table based on battery communication data. If the type of battery pack 3 does not meet the starting requirements, the motor will not be started. Taking a power tool with battery pack 3 installed at the rear of the tool as an example, the fact that the type of battery pack 3 does not meet the starting requirements can be understood as follows: after installing this type of battery pack 3 on the power tool, it will cause the center of gravity of the power tool to shift significantly rearward, which may lead to insufficient balance of the power tool and safety problems such as tipping. For example, if the type of battery pack 3 is A, and the change in the center of gravity position of the corresponding power tool after installing battery pack 3 is greater than the change threshold, then type A battery pack 3 does not meet the starting requirements of this power tool.

[0105] In one embodiment, the controller is configured to issue an alarm message if the type of battery pack 3 does not meet the startup requirements, to indicate to the user that the installed battery pack 3 is incompatible with the tool body 1. The alarm message can be an audible alarm, a visual alarm, or an audible and visual alarm.

[0106] In one embodiment, the controller is configured to disconnect the power supply path between the battery pack 3 and the motor if the type of the battery pack 3 does not meet the starting requirements, and not supply power to the motor. Even if a signal to start the handheld power tool is sent to the controller, the motor will not start, and the handheld power tool will not work, ensuring the safety of the user.

[0107] In one embodiment, the controller is configured to issue a non-start control signal if the type of battery pack 3 does not meet the start requirements, so as to control the motor not to start. Even if a signal to start the handheld power tool is sent to the controller, the motor will not start, the handheld power tool will not work, and the user's safety is guaranteed.

[0108] In one embodiment, the controller is configured not to respond to a start signal if the type of battery pack 3 does not meet the start requirements, so that the motor is not started. Even if a signal to start the handheld power tool is sent to the controller, the motor will not start, ensuring the safety of the user.

[0109] In one embodiment, such as Figure 1 and Figure 3 As shown, the handheld power tool is a chainsaw, which includes a tool body 1, a battery mounting part 6, a motor, and a control circuit. The battery mounting part 6 is disposed on the tool body 1, and the battery pack 3 is mounted on the battery mounting part 6. The motor is disposed inside the tool body 1, and the control circuit is configured to control the motor's start or rotation state. The control circuit includes a parameter detection module and a controller. The parameter detection module acquires battery communication data at least when the battery pack 3 is installed in the battery mounting part 6. The controller determines the center of gravity offset of the tool body 1 after the battery pack 3 is installed based on the battery communication data. If the center of gravity offset is greater than the offset threshold, the chainsaw's balance deteriorates, the motor does not start, and the chainsaw is prevented from tilting, which poses a safety risk during operation and results in poor work performance. The center of gravity offset can be understood as the difference between the two centers of gravity before and after the battery pack 3 is installed, and may include the distance between the two centers of gravity and their relative positional relationship. In this embodiment, the center of gravity offset can also be stored in the aforementioned storage device.

[0110] In one embodiment, the controller is configured to obtain the center of gravity offset by looking up a table based on battery communication data. The obtained center of gravity offset can be used to determine whether the connection has lost balance, and thus determine whether to start the motor.

[0111] Generally, after installing battery pack 3, the center of gravity of the chainsaw is closer to the rear of the machine compared to before battery pack 3 was installed. When the rearward displacement of the center of gravity reaches a certain amount, the center of gravity offset exceeds a threshold. The controller is configured to issue an alarm message when the center of gravity offset exceeds the threshold, to notify the user that the installed battery pack 3 is incompatible with the tool body 1. The alarm message can be an audible alarm, a visual alarm, or an audible and visual alarm.

[0112] In one embodiment, the controller is configured to disconnect the power supply path between the battery pack 3 and the motor when the center of gravity offset is greater than the offset threshold, so that no power is supplied to the motor. Even if a signal to start the chainsaw is sent to the controller, the motor will not start and the chainsaw will not work, thus ensuring the safety of the user.

[0113] In one embodiment, the controller is configured to issue a non-start control signal when the center of gravity offset is greater than an offset threshold, so as to prevent the motor from starting. Even if a signal to start the chainsaw is sent to the controller, the motor will not start and the chainsaw will not work, thus ensuring the safety of the user.

[0114] In one embodiment, the controller is configured not to respond to the start signal if the center of gravity offset is greater than an offset threshold, so that the motor is not started. Even if a start signal for the chainsaw is sent to the controller, the motor will not start, ensuring user safety.

[0115] In some cases, portable battery packs, such as backpack battery packs or portable battery packs, can be used to power power tools. When using a backpack battery pack, the corresponding battery pack type, center of gravity change, or center of gravity offset should be checked based on battery communication data to confirm whether the battery pack will cause balance or safety issues with the tool. If balance or safety issues exist, it should not be used. Therefore, before determining whether installing a battery pack will cause imbalance and safety hazards in a power tool, it is necessary to determine whether the compatible battery pack is a portable or backpack battery pack.

[0116] like Figure 3 As shown, the handheld power tool also includes a power mounting section 16, which is disposed on the tool body 1 and is used to mount a power conversion device 17. The power conversion device 17 can be understood as an adapter or power converter, but does not have components such as batteries that can store large amounts of electrical energy.

[0117] like Figure 3As shown, the power tool is a chainsaw, and the power conversion device 17 is installed on the battery power mounting section 16 of the chainsaw. A portable power supply 18 can be electrically connected to the power conversion device 17, which can convert the electrical energy from the portable power supply 18 to power the power tool. In this embodiment, the portable power supply 18 includes a first battery pack 181, a carrying assembly 182, and a power cord 183. The first battery pack 181, when installed on the carrying assembly 182, can be carried by the operator, avoiding inconvenience or safety hazards caused by the excessive weight of the battery pack 181 itself. It is understood that the weight and volume of the power conversion device 17 are basically fixed, and its installation on the power tool will not cause a significant shift in the overall center of gravity of the tool, thus preventing the chainsaw or other tools from tilting.

[0118] In this embodiment, the parameter detection module acquires at least the power communication data from the power conversion device 17. When the controller determines that the power source connected to the power conversion device 17 is the portable power source 18 based on the power communication data, the balance of the handheld power tool will not change, and it can respond to the start information to control the motor to start. There is no safety risk during operation, and the operation effect is not affected.

[0119] In one embodiment, the controller is configured to connect the power supply path between the portable power supply 183 and the motor to provide power to the motor if it is determined that the power source connected to the power conversion device 17 is the portable power supply 18.

[0120] In one embodiment, the controller is configured to issue a start control signal to control the motor to start when it is determined that the power source connected to the power conversion device 17 is a portable power source 18.

[0121] In one embodiment, the controller is configured to respond to a start signal to start the motor if it is determined that the power source connected to the power conversion device 17 is a portable power source 18.

[0122] See also Figure 1 As shown, the handheld power tool is a chainsaw, which includes a tool body 1, an actuator 2, a motor, and a battery pack 3. The actuator 2 is coupled to the tool body 1 along a first direction. The actuator 2 includes a guide plate 21 and a chain 22 mounted on the guide plate 21. The motor is located inside the tool body 1 and drives the actuator 2. The battery pack 3 is installed in the tool body 1 and provides power to the motor.

[0123] The ratio of the maximum width D1 of the projection of the tool body 1 in the horizontal plane to the width D2 of the projection of the battery pack 3 in the horizontal plane is greater than or equal to 0.5 and less than or equal to 1, for example, it can be 0.6, 0.7, 0.8, 0.9, etc. At least the width of the battery pack 3 is sufficient to ensure that its installation on the chainsaw will not increase the balance angle of the actuator 2, thus avoiding the problem of the tool body 1 tilting at the balance position of the chainsaw; in addition, the width of the tool body 1 is less than the width of the battery pack 3, and the width of the battery pack 3 is the maximum width of the chainsaw. While ensuring the balance of the whole machine, the width of the tool body 1 will not be increased, thereby controlling the width of the chainsaw.

[0124] The upper surface of the tool body 1 forms a first handle 4 that extends substantially along a first direction, and the left or right side of the tool body 1 forms a second handle 5. The first handle 4 and the second handle 5 are available for the user to grip. The rear end face of the tool body 1 forms a battery mounting part 6 for mounting a battery pack 3. The battery pack 3 is located at the rear end of the tool body 1. If the balance performance of the tool body 1 deteriorates after the battery pack 3 is installed, it may cause problems such as the chainsaw tip tilting, affecting the cutting work. Therefore, a battery pack 3 that matches the tool body 1 is required.

[0125] Combination Figure 1 and Figure 2 As shown, the width D3 of the lower end face of the tool body 1 is approximately 60 mm. In one embodiment, the ratio of the width D3 of the lower end face of the tool body 1 to the maximum width D1 projected onto the tool body 1 in the horizontal plane is less than or equal to 0.8. The ratio of the width D4 of the battery mounting portion 6 to the maximum width D1 projected onto the tool body 1 in the horizontal plane is less than or equal to 0.8. The width of the battery mounting portion 6 is less than the maximum width projected onto the tool body 1 in the horizontal plane, thus not increasing the width of the tool body 1. The ratio of the width D4 of the battery mounting portion 6 to the width D2 projected onto the battery pack 3 in the horizontal plane is less than or equal to 0.5.

[0126] The maximum width D1 of the projection of the tool body 1 in the horizontal plane is less than or equal to the width D2 of the projection of the battery pack 3 in the horizontal plane. The width of the battery pack 3 is the maximum value of the chainsaw width. While ensuring the overall balance of the machine and preventing the tool body 1 from tilting, the width of the tool body 1 will not be increased, thus allowing control over the width of the chainsaw.

[0127] like Figure 4As shown, the angle α between the installation direction of the battery pack 3 onto the tool body 1 and the first direction is greater than or equal to 50° and less than or equal to 60°. After the battery pack 3 is installed onto the tool body 1, the overall length of the chainsaw will not be excessively increased, thus preventing the chainsaw from becoming too large, provided that the height of the battery pack 3 does not exceed the height of the tool body 1. The included angle α can be 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, or 60°, etc., and is not specifically limited here.

[0128] After the battery pack 3 is installed on the tool body 1, the length increment D5 of the tool body 1 in the first direction is greater than or equal to 60mm and less than or equal to 90mm. This will not excessively increase the overall length of the chainsaw, causing it to become too large and ensuring the chainsaw's balance. When the lower end face of the tool body 1 is placed on a horizontal plane, the maximum height of the tool body 1 in the vertical direction is greater than or equal to the height of the battery pack 3. Installing the battery pack 3 will not increase the overall height of the chainsaw.

[0129] Continue to refer to Figure 4 As shown, the tool body 1 has a first center of gravity G1 when the battery pack 3 is not installed, and the battery pack 3 has a second center of gravity G2. When the lower end face of the tool body 1 is placed on a horizontal plane, the first center of gravity G1 is located below the second center of gravity G2, which can prevent the chainsaw from tilting when it is in a balanced position.

[0130] After the battery pack 3 is installed on the tool body 1, the tool body 1 has a third center of gravity G3, which is located above the first center of gravity G1, preventing the chainsaw from tilting. Furthermore, by positioning the first center of gravity G1 below the second center of gravity G2, the third center of gravity G3 formed after installing the battery pack 3 on the tool body 1 is ensured to be above the first center of gravity G1. In the second direction, the third center of gravity G3 is positioned between the first center of gravity G1 and the second center of gravity G2, ensuring that the chainsaw will not tilt.

[0131] The aforementioned first center of gravity G1 can be the center of gravity formed when the tool body 1 is equipped with the actuator 2, or it can be the center of gravity formed when the tool body 1 is not equipped with the actuator 2.

[0132] like Figure 4 , Figure 5 and Figure 6As shown, the battery pack 3 is installed at the rear end of the tool body 1. A battery mounting section 6 is formed at the rear end of the tool body 1, and the battery pack 3 is mounted on the battery mounting section 6. A suspension member 7 is also provided at the rear end of the tool body 1. When the lower end face of the tool body 1 is on a horizontal plane, the suspension member 7 is located above the center of gravity of the tool body 1. This center of gravity of the tool body 1 can be either the first center of gravity G1 without the battery pack 3 installed, or the third center of gravity G3 after the battery pack 3 is installed. To meet safety regulations, the chainsaw is equipped with a suspension member 7. The battery pack 3 is installed at the rear end of the tool body 1, and the suspension member 7 is located at the rear end of the tool body 1. This allows for the installation of the suspension member 7 without increasing the thickness of the tool body 1's casing or using a battery compartment. When using the suspension member 7 to suspend the chainsaw, the angle between the actuator 2 and the vertical direction is ensured to be a safe angle, preventing the actuator 2 from rubbing against the user and improving the safety of the chainsaw's use.

[0133] The suspension component 7 is set on the side of the tool body 1 that forms the second handle 5, that is, the suspension component 7 and the second handle 5 are set on the same side, which will not increase the width of the tool body 1.

[0134] The suspension component 7 is located at the rear end of the first handle 4 and near the upper end of the battery mounting part 6. The suspension component 7 can be installed without increasing the thickness of the tool body 1 or using a battery compartment.

[0135] When the tool body 1 is not equipped with the battery pack 3, it has a first center of gravity G1. When the lower end of the tool body 1 is placed on a horizontal plane, the suspension member 7 is located above the first center of gravity G1. When using the suspension member 7 to suspend the chainsaw, the angle between the actuator 2 and the vertical direction is ensured to be a safe angle, preventing the actuator 2 from rubbing against the human body and improving the safety of chainsaw use.

[0136] With the battery pack 3 installed, the tool body 1 has a third center of gravity G3. When the lower end of the tool body 1 is placed on a horizontal plane, the suspension member 7 is located above the third center of gravity G3. When using the suspension member 7 to suspend the chainsaw, the angle between the actuator 2 and the vertical direction is ensured to be a safe angle, preventing the actuator 2 from rubbing against the human body and improving the safety of chainsaw use.

[0137] See Figure 5 As shown, the minimum distance H1 between the suspension component 7 and the first center of gravity G1 is greater than or equal to 55mm.

[0138] When the chainsaw is operated and suspended by the suspension member 7, the minimum vertical distance H2 between the suspension member 7 and the first center of gravity G1 of the tool body 1 is greater than or equal to 45mm, ensuring that the angle between the actuator 2 and the vertical direction is a safe angle.

[0139] In the horizontal direction perpendicular to the vertical direction, the minimum distance H3 between the suspension component 7 and the first center of gravity G1 of the tool body 1 is greater than or equal to 30mm, ensuring that the angle between the actuator 2 and the vertical direction is a safe angle.

[0140] When the chainsaw is operated and suspended by the suspension member 7, the angle β between the first direction and the vertical direction is greater than or equal to 15° and less than or equal to 22°. The first direction is the direction in which the actuator 2 extends, that is, the angle β between the actuator 2 and the vertical direction is greater than or equal to 15° and less than or equal to 22°, ensuring that the angle between the actuator 2 and the vertical direction is a safe angle to avoid collision with the human body.

[0141] In this embodiment, the rated voltage of the battery pack 3 is greater than or equal to 4V, for example, it can be 8V, 12V, 24V, etc.

[0142] like Figure 7 , Figure 8a and Figure 8b As shown, the chainsaw's actuator 2 includes a chain guide plate 21 on which a chain 22 is supported. The chainsaw also includes a tensioning system 8, which is mounted on the tool body 1. The tensioning system 8 is operated to adjust the tension of the chain 22 to ensure the chainsaw's working effect.

[0143] The tensioning system 8 includes an adjustment knob 81 and a tensioning device 82. The adjustment knob 81 is operated to adjust the tension force, which is convenient and does not require tools. The tensioning device 82 is connected to the chain guide plate 21 and is configured to adjust the tension force in response to the rotation of the adjustment knob 81.

[0144] The tensioning system 8 also includes a chain cover 83, which is mounted on the tool body 1. An adjustment knob 81 is located on the chain cover 83, and a tensioning device 82 is mounted on the inside of the chain cover 83. By integrating the tensioning device 82 and the adjustment knob 81 onto the chain cover 83, the chain cover 83 and the tensioning system 8 can be disassembled and installed simultaneously.

[0145] The adjustment knob 81 is flexibly connected to the tensioning device 82, which reduces the weight and size of the tensioning device 82, thereby reducing the size of the chain cover 83 and lowering production costs.

[0146] The rotational force generated by rotating the adjustment knob 81 is transmitted to the tensioning device 82 along the curved direction, changing the direction of force transmission and achieving tensioning of the chain 22. This simplifies the structure and reduces production costs.

[0147] The tensioning device 82 includes a flexible shaft 821. The force of rotating the adjusting knob 81 is transmitted to the chain guide plate 21 through the flexible shaft 821. The tensioning device 82 changes the direction of the force, thereby tensioning the chain 22. This reduces the weight and size of the tensioning device 82, which in turn reduces the size of the chain cover 83 and lowers production costs.

[0148] In one embodiment, at least the tensioning device 82 connected to the adjustment knob 81 is configured as a flexible shaft 821, which is used to change the direction of force transmission to achieve the tensioning function.

[0149] The tensioning device 82 includes a tensioning shaft 822 and a tensioning pin 823. The tensioning pin 823 is operated to rotate with the rotation of the adjusting knob 81. One end of the tensioning pin 823 is threaded to the tensioning shaft 822, and the other end is connected to the chain guide plate 21. At least a portion of the tensioning shaft 822 is configured as a flexible shaft 821. The tensioning shaft 822 is rotatably mounted on the chain cover 83. The force of rotating the adjusting knob 81 is transmitted to the tensioning shaft 822 through the flexible shaft 821. As the tensioning shaft 822 rotates, the tensioning pin 823 moves axially along the tensioning shaft 822, thereby tensioning the chain 22. Compared with the existing structure, this reduces the weight and size of the tensioning device 82, thereby reducing the size of the chain cover 83 and lowering production costs.

[0150] The ratio of the length of the flexible shaft 821 to the length of the tensioning shaft 822 is less than or equal to 1, that is, the length of the flexible shaft 821 is less than or equal to the length of the tensioning shaft 822, so as to ensure that the chain 22 is tensioned within the required range.

[0151] The length of the flexible shaft 821 is at least about 25mm, for example, it can be any value between 20mm and 30mm.

[0152] The tensioning shaft 822 also includes a lead screw, and the tensioning pin 823 is connected to the lead screw, realizing the threaded connection between the tensioning pin 823 and the tensioning shaft 822. The structure is simple and easy to implement.

[0153] The flexible shaft 821 is press-fitted to the lead screw, resulting in a simple connection process and good connection stability. The connection method between the flexible shaft 821 and the adjusting knob 81 includes one of the following: press-fit connection, injection molding connection, and die casting connection.

[0154] In the direction perpendicular to the plane of the chain guide plate 21, the maximum thickness of the chain cover 83 is less than or equal to 40 mm, for example, it can be 35 mm, 38 mm, 40 mm, etc. Since the tensioning device 82 includes a flexible shaft 821, the size of the tensioning device 82 is reduced, so that the thickness of the chain cover 83 is not increased when the tensioning device 82 and the adjusting knob 81 are installed on the chain cover 83.

[0155] The chain cover 83 weighs approximately 150g, but can be 145g, 150g, 155g, etc. The flexible shaft 821 reduces the weight of the tensioning device 82, so that the chain cover 83 does not need to be added to its weight when the tensioning device 82 and the adjusting knob 81 are mounted on it.

[0156] The aforementioned adjustment knob 81 is a flip-top structure. After the adjustment knob 81 is installed on the chain cover 83, the size of the chain cover 83 in the plane perpendicular to the chain guide plate 21 can be reduced.

[0157] The chain cover 83 is also equipped with a clamping knob 84. The clamping knob 84 rotates in the same direction as the adjusting knob 81 to meet the customer's first reaction. The clamping knob 84 and the adjusting knob 81 rotate in the same direction to tighten or loosen.

[0158] The distance between the rotation center of the clamping knob 84 and the rotation center of the adjusting knob 81 in the first direction is 50mm-65mm, so as to limit the size of the chain cover 83 and the chain saw in the first direction without affecting the tensioning stroke of the chain 22.

[0159] The distance between the rotation center of the clamping knob 84 and the center of the adjusting knob 81 in the second direction is 12mm-24mm, which does not affect the discharge of sawdust entering the chain cover 83.

[0160] The clamping knob 84 is also a flip-top structure. After the clamping knob 84 is installed on the chain cover 83, the size of the chain cover 83 in the plane perpendicular to the chain guide plate 21 can be reduced.

[0161] In one embodiment, the chainsaw further includes a first tensioning system and a second tensioning system. The first tensioning system is detachably mounted on the tool body 1 and is operated to adjust the tension of the chain 22 using an external tool. The second tensioning system is detachably mounted on the tool body 1 and is operated to adjust the tension of the chain 22. The second tensioning system includes an adjustment knob 81 and a tensioning device 82. The adjustment knob 81 is operable to adjust the tension, and the tensioning device 82 is connected to the chain guide plate 21 and is configured to adjust the tension in response to the rotation of the adjustment knob 81. The tensioning device 82 includes a flexible shaft 821. The chainsaw is equipped with two different types of tensioning systems, allowing users to install different tensioning systems onto the tool body 1 as needed, providing high flexibility. Furthermore, the second tensioning system adjusts the tension by rotating the adjustment knob 81 and the tensioning device 82, facilitating operation without the need for tools. The tensioning device 82, including the flexible shaft 821, reduces the weight and size of the tensioning device 82 compared to existing structures, thereby reducing the size of the chain cover 83 and lowering production costs.

[0162] The other structures of the second tensioning system can be the same as those of the tensioning system 8 described above, and will not be described in detail here.

[0163] like Figure 7 and Figure 9 As shown, the chainsaw includes a tool body 1, with a battery mounting portion 6 formed at the rear end of the tool body 1, and a battery pack 3 mounted on the battery mounting portion 6. A chain cover 83 is provided on the left or right side of the tool body 1. When the actuator 2 cuts, wood chips enter the chain cover 83. A chip removal channel is provided inside the chain cover 83, and a chip removal port is provided between the chain cover 83 and the tool body 1. The wood chips are guided by the chip removal channel and discharged through the chip removal port from the chain cover 83. However, during the discharge process, there is a problem that wood chips may spray onto the battery pack 3. To solve this problem, the prior art uses the chain cover 83 to guide and block the wood chips, preventing them from directly spraying onto the battery pack 3. However, this solution increases the vertical dimension of the chain cover 83, thus increasing the size of the chainsaw. Therefore, this application provides a chip-blocking rib 9 on the tool body or on the battery mounting portion 6, positioned between the chip removal port and the battery pack 3. The chip-blocking rib 9 guides the discharged wood chips, preventing them from directly spraying onto the battery pack 3, and reduces the vertical dimension of the chain cover 83.

[0164] The chip-blocking rib 9 is integrally formed with the tool body 1 or the battery mounting part 6, or it can be detachably provided on the tool body 1 or the battery mounting part 6, or it can extend downward from the outer edge of the battery mounting part 6 to form the chip-blocking rib 9. The chip-blocking rib 9 can at least cover the area below the center of the bottom surface of the battery pack 3.

[0165] like Figure 10 and Figure 11 As shown, the chainsaw also includes a brake baffle 10, with a gap between the brake baffle 10 and the tool body 1. The brake baffle 10 has a retaining rib 11 positioned at the gap to prevent the user's fingers from passing through the gap and touching the exposed end of the chain 22. When using the chainsaw, the user holds the first handle 4 with their right hand and the second handle 5 with their left hand. Due to the retaining rib 11, the user's left-hand fingers cannot pass through the gap. The retaining rib 11 at the gap between the brake baffle 10 and the tool body 1 shortens the chainsaw's length, replacing the prior art's method of increasing the distance between the brake baffle 10 and the exposed end of the chain 22 to prevent the user's fingers from passing through the gap and touching the exposed end of the chain 22.

[0166] The shielding rib 11 is integrally formed with the brake baffle 10 or is non-detachably coupled to the brake baffle 10.

[0167] The shielding rib 11 is spaced apart from the tool body 1, but the distance between the two is less than or equal to 20mm to prevent a person's fingers from passing through.

[0168] The connection between the second handle 5 and the tool body 1 exposes the shortest curve distance of the end of the chain 22 on the outside, which is less than 120mm, shortening the length of the chainsaw compared to existing technologies.

[0169] When replacing the chain guide plate 21, the chainsaw needs to be placed on its side, requiring good stability in this position. With the battery pack 3 installed, the battery pack 3 and the second handle 5 form a stable support structure, allowing the chainsaw to be placed on its side with the mounting side of the chain guide plate 21 facing the user, facilitating replacement of the chain guide plate 21. Figure 12 As shown, without the battery pack 3 installed, the tool body 1 and the second handle 5 form a stable support structure and can be supported on a flat surface, allowing the chainsaw to be placed on its side with the mounting side of the chain guide plate 21 facing the user, making it convenient for the user to replace the chain guide plate 21.

[0170] like Figure 13 and Figure 14 As shown, the chainsaw also includes an oil pump 12 and an oil tank 15. The oil pump 12 is a wear part and requires regular cleaning and maintenance. The oil pump 12 and oil tank 15 are positioned on opposite sides of the chainsaw. The oil pump 12 is housed within a cavity covered by a chain cover 83. Opening the chain cover 83 exposes the oil pump 12, facilitating cleaning and maintenance. Furthermore, this positioning of the oil pump 12 is suitable for chainsaws with purely electronic brakes, reducing costs.

[0171] The oil pump 12 has a detachable inlet pipe 13 at its input end and an outlet pipe 14 at its output end, which allows for quick cleaning and replacement of the oil pump 12.

[0172] 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, characterized in that, include: Tool body; The motor is located inside the tool body; Chain guide plate, configured to support the chain; The tensioning system, mounted on the tool body, is operated to adjust the tension of the chain; The tensioning system includes: The adjustment knob is operated to adjust the tension force; The tensioning device, connected to the chain guide plate, is configured to adjust the tension force in response to the rotation of the adjustment knob; The tensioning device includes a flexible shaft.

2. The chainsaw according to claim 1, characterized in that, At least the tensioning device connected to the adjustment knob is configured as the flexible shaft.

3. The chainsaw according to claim 1, characterized in that, The tensioning system also includes a chain cover, which is mounted on the tool body. The adjustment knob is located on the chain cover, and the tensioning device is mounted on the inside of the chain cover.

4. The chainsaw according to claim 3, characterized in that, In the direction perpendicular to the plane of the chain guide plate, the maximum thickness of the chain cover is less than or equal to 40 mm.

5. The chainsaw according to claim 3, characterized in that, The weight of the chain cover is 145g-155g.

6. The chainsaw according to claim 1, characterized in that, The tensioning device includes a tensioning shaft and a tensioning pin. The tensioning shaft is operated to rotate with the rotation of the adjustment knob. One end of the tensioning pin is threaded onto the tensioning shaft, and the other end is connected to the chain guide plate. The tensioning shaft is at least partially configured as the flexible shaft.

7. The chainsaw according to claim 6, characterized in that, The ratio of the length of the flexible shaft to the length of the tensioning shaft is less than or equal to 1.

8. The chainsaw according to claim 6 or 7, characterized in that, The length of the flexible shaft is at least 20mm-30mm.

9. The chainsaw according to claim 6, characterized in that, The tensioning shaft also includes a lead screw, and the tensioning pin is connected to the lead screw.

10. The chainsaw according to claim 9, characterized in that, The flexible shaft is press-fitted to the lead screw.

11. The chainsaw according to claim 2, characterized in that, The connection method between the flexible shaft and the adjustment knob includes one of press-fit connection, injection molding connection, and die casting connection.

12. A chainsaw, characterized in that, include: Tool body; The motor is located inside the tool body; Chain guide plate, configured to support the chain; The tensioning system, mounted on the tool body, is operated to adjust the tension of the chain; The tensioning system includes: The adjustment knob is operated to adjust the tension force; The tensioning device, connected to the chain guide plate, is configured to adjust the tension force in response to the rotation of the adjustment knob; The adjustment knob and the tensioning device are flexibly connected.

13. The chainsaw according to claim 12, characterized in that, The tensioning device includes a tensioning shaft and a tensioning pin. The tensioning shaft is operated to rotate with the rotation of the adjustment knob. One end of the tensioning pin is threaded onto the tensioning shaft, and the other end is connected to the chain guide plate. The tensioning shaft is at least partially configured as a flexible shaft.

14. The chainsaw according to claim 13, characterized in that, The tensioning shaft also includes a lead screw, and the tensioning pin is connected to the lead screw.

15. A chainsaw, characterized in that, include: Tool body; The motor is located inside the tool body; Chain guide plate, configured to support the chain; The tensioning system, mounted on the tool body, is operated to adjust the tension of the chain; The tensioning system includes: The adjustment knob is operated to adjust the tension force; The tensioning device, connected to the chain guide plate, is configured to adjust the tension force in response to the rotation of the adjustment knob; The rotational force generated by rotating the adjustment knob is transmitted to the tensioning device along the curved direction.

16. The chainsaw according to claim 15, characterized in that, At least the tensioning device connected to the adjustment knob is configured as a flexible shaft.

17. A chainsaw, characterized in that, include: Tool body; The motor is located inside the tool body; Chain guide plate, configured to support the chain; The first tensioning system, detachably mounted on the tool body, is operated to adjust the tension of the chain using an external tool; The second tensioning system, detachably mounted on the tool body, is operated to adjust the tension of the chain; The second tensioning system includes: An adjustment knob that can be operated to adjust the tension; The tensioning device, connected to the chain guide plate, is configured to adjust the tension force in response to the rotation of the adjustment knob; The tensioning device includes a flexible shaft.

18. The chainsaw according to claim 17, characterized in that, The second tensioning system also includes a chain cover, which is mounted on the tool body. The adjustment knob is located on the chain cover, and the tensioning device is installed inside the chain cover.

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