chain saw

Abstract

The application relates to a chain saw, which comprises a main body, a guide plate connected to the main body and a tensioning assembly, the tensioning assembly comprising a locking bolt, a pushing subassembly, a linkage subassembly, a knob subassembly and an anti-loosening piece; the locking bolt is connected to the main body and extends in the axial direction; the knob subassembly is threadedly connected with the locking bolt, and the linkage subassembly is connected with the knob subassembly and rotates together with the knob subassembly; the pushing subassembly cooperates with the linkage subassembly to adjust the position of the guide plate relative to the main body; the anti-loosening piece is connected with the linkage subassembly and abuts against the linkage subassembly in the axial direction to enable the linkage subassembly to have a compression force moving towards the pushing subassembly; and the anti-loosening piece is rotatably moved in the axial direction to adjust the compression force, thereby reducing the problem that the pushing subassembly and the linkage subassembly are separated from each other to cause tensioning failure.

Description

Technical Field

[0001] This application relates to the field of sawing equipment technology, and in particular to a chainsaw. Background Technology

[0002] In chainsaw equipment, the tensioning mechanism of the guide chain directly affects cutting efficiency and operational safety. Traditional tensioning methods require repeated adjustment of the locking bolts using tools, which is cumbersome and time-consuming. To improve efficiency, the industry has developed tool-free rapid tensioning technology, among which the spring-loaded tooth locking solution has become mainstream. This solution uses a knob to drive a sprocket, which moves the guide plate to achieve chain tensioning, and the spring pressure locks the linkage ring into position with the teeth of the tensioning wheel assembly. The advantages of this solution are its simplified structure, convenient operation, and rapid completion of the tensioning action.

[0003] However, in the above solution, the tooth locking relies on the clamping force of a single spring. Due to the limited spring force, under the continuous vibration environment of the chainsaw, the tooth engagement is prone to disengagement due to vibration and impact, causing the guide plate to retract and the chain to loosen. This not only easily reduces cutting accuracy but may also cause safety risks such as chain derailment or breakage, especially in high-load conditions or long-handled chainsaws, where the vibration amplitude is greater and the problem is more prominent. Utility Model Content

[0004] In view of the above, it is necessary to provide a chainsaw that can reduce the problem of tension failure caused by the disengagement of the push sub-component and the linkage sub-component.

[0005] This application provides a chainsaw, including a main body, a guide plate connected to the main body, and a tensioning assembly. The tensioning assembly includes a locking bolt, a push sub-assembly, a linkage sub-assembly, a knob assembly, and an anti-loosening element. The locking bolt is connected to the main body and extends axially. The knob sub-assembly is threadedly connected to the locking bolt, and the linkage sub-assembly is connected to the knob assembly and rotates together with the knob assembly. The push sub-assembly cooperates with the linkage sub-assembly to adjust the position of the guide plate relative to the main body. The anti-loosening element is connected to the linkage sub-assembly and abuts against the linkage sub-assembly in the axial direction to give the linkage sub-assembly a clamping force toward the push sub-assembly. The anti-loosening element is rotatably movable axially to adjust the clamping force.

[0006] In some embodiments, the anti-loosening element is at least partially located between the knob sub-assembly and the linkage sub-assembly, and the clamping force applied when the anti-loosening element is close to the linkage sub-assembly is greater than the clamping force applied when the anti-loosening element is far away from the linkage sub-assembly.

[0007] In some embodiments, the anti-loosening member includes an annular rotating portion and a protruding ring formed on the annular rotating portion. The annular rotating portion is sleeved on the knob sub-assembly, and the protruding ring is used to abut against the linkage sub-assembly.

[0008] In some embodiments, the knob sub-assembly includes a rotating portion and a linkage portion formed on the rotating portion, an anti-loosening element is sleeved on the end of the linkage portion near the rotating portion, the linkage sub-assembly is disposed on the linkage portion, and the end of the linkage portion away from the rotating portion has a threaded hole that matches the locking bolt.

[0009] In some embodiments, the linkage sub-assembly includes a tension spring and a tension linkage ring; the tension spring is sleeved on the tension linkage ring, and an anti-loosening member abuts against the tension spring to give the tension linkage ring a clamping force toward the movement of the push sub-assembly; the tension linkage ring is sleeved on the knob sub-assembly, and the end face of the tension linkage ring in contact with the push sub-assembly has a plurality of first teeth, and the push sub-assembly has a plurality of second teeth that cooperate with the first teeth.

[0010] In some embodiments, the push sub-assembly is configured to drive the guide plate away from the main body. The push sub-assembly includes an annular fixing portion and a spiral wheel formed in the annular fixing portion. The annular fixing portion has a second tooth formed on its end face near the tensioning linkage ring.

[0011] In some embodiments, the knob sub-assembly has a plurality of first splines, and the linkage sub-assembly has a plurality of second splines that cooperate with the first splines.

[0012] In some embodiments, a guide plate pusher is further included, which is disposed on a guide plate and has a protrusion that abuts against a pusher assembly. The protrusion is configured to move away from the main body under the drive of the pusher assembly.

[0013] In some embodiments, a guide plate pusher is further included, which is disposed on a guide plate and has a protrusion that abuts against a spiral wheel. The protrusion is configured to move away from the main body under the drive of the spiral wheel.

[0014] In some embodiments, the upper surface of the annular rotating part has a receiving groove that is adapted to the size of the knob assembly. The knob assembly is located in the receiving groove and the height of the upper surface of the knob assembly is less than or equal to the height of the receiving groove. The upper surface of the knob assembly is provided with a hidden pull buckle, which is configured to rotate when pulled up and drive the entire knob assembly to rotate.

[0015] Compared with the prior art, this application has at least the following advantages:

[0016] 1. By rotatably moving an independent anti-loosening component (such as a ring-shaped rotating part with a raised ring), the clamping force acting on the linkage sub-assembly can be directly controlled. The clamping force increases when the anti-loosening component is close to the linkage sub-assembly and decreases when it is far away. This can effectively reduce the defect of insufficient clamping force of traditional single spring. Under the high-load vibration condition of the chainsaw, the locking force can be actively enhanced, thereby reducing the risk of chain loosening caused by guide plate retraction from the root.

[0017] 2. While retaining the connection between the tensioning linkage ring and the pusher assembly to achieve rigid positioning, a pressure compensation system consisting of an anti-loosening component and a tensioning spring is added. The adjustable clamping force applied by the anti-loosening component forms a continuous flexible constraint. The dual mechanism works together to suppress micro-displacement caused by vibration and impact, which can significantly improve the positional stability of the guide plate. This not only maintains cutting accuracy but also greatly reduces the safety hazards of chain derailment or breakage.

[0018] 3. The knob assembly is responsible for driving the guide plate to move to adjust the chain tension, while the anti-loosening component independently undertakes the function of adjusting the clamping force. The two are physically separated by a sleeve structure and their operation does not interfere with each other. This can reduce the risk of the knob operation accidentally changing the locking pressure in the traditional solution, ensure the stable and reliable locking state, and at the same time continue the advantage of tool-free quick adjustment, taking into account both the convenience of operation and the long-term reliability of the system. Attached Figure Description

[0019] Figure 1 A schematic diagram of the structure of the chainsaw in this application embodiment.

[0020] Figure 2 This is a cross-sectional schematic diagram of the structure of the tensioning component according to an embodiment of this application and its arrangement on the main body.

[0021] Figure 3 This is an exploded view of the tensioning component according to an embodiment of this application.

[0022] Figure 4 This is a schematic diagram of the anti-loosening component according to an embodiment of this application.

[0023] Figure 5 This is a structural schematic diagram of the anti-loosening component from another perspective of an embodiment of this application.

[0024] Figure 6 This is a schematic diagram of the structure of the knob assembly according to an embodiment of this application.

[0025] Figure 7 This is a schematic diagram of the tensioning linkage ring of the linkage sub-component in an embodiment of this application.

[0026] Figure 8 This is a schematic diagram of the structure of the pusher sub-component in an embodiment of this application.

[0027] Figure 9 This is a schematic diagram of the structure of the guide plate pusher block according to an embodiment of this application.

[0028] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0029] In the description of the embodiments in this application, the words "exemplary," "or," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of the words "exemplary," "or," and "for example" is intended to present the relevant concepts in a specific manner.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application's specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. "At least one" means one or more. "More than one" means two or more. It should also be noted that the terms "first" and "second" in this application's specification, claims, and drawings are used to distinguish similar objects and not to describe a specific order or sequence.

[0031] In chainsaws, a highly efficient power cutting device, the core is the cutting system composed of a guide plate and a chain. The performance of the tensioning mechanism of the guide plate and chain directly determines the smoothness of the cutting process, the precision and quality of the final cut surface, and operational safety. Traditional tensioning mechanisms rely on the operator repeatedly adjusting the locking bolts using specific tools (such as wrenches), a cumbersome and time-consuming process that is inefficient in work environments requiring frequent adjustments, significantly impacting the overall work rhythm.

[0032] To improve efficiency, tool-free rapid tensioning technology has been developed in the industry. Among these technologies, the solution based on the spring-loaded toothed locking principle stands out due to its significant convenience and has become the mainstream design. Its core operating logic is simple and intuitive: the user only needs to rotate a specially designed knob, which is converted into linear thrust through an internal precision helical wheel mechanism, precisely pushing the guide plate forward, thus achieving instant chain tensioning. Once the chain reaches the ideal tension, the mechanism relies on the continuous pressure generated by the preset spring to drive the linkage ring to tightly engage with the teeth on the tensioning wheel assembly, forming a rigid lock and firmly fixing the guide plate in place. The outstanding advantage of this design is its significantly simplified structure, completely eliminating tool dependence and making tensioning operations exceptionally quick and easy. Users can complete adjustments within seconds, greatly improving the smoothness of the operation.

[0033] However, in the above solution, the core locking mechanism—the stability of the tooth meshing—relies entirely on the axial clamping force provided by a single spring. Due to physical limitations, the pressure that a spring can generate has an inherent upper limit. When the chainsaw enters continuous operation, the combined effect of engine operation and cutting resistance inevitably causes complex and intense vibrations and impacts to the entire device. Under this harsh environment, the limited spring clamping force becomes insufficient. High-frequency vibrations continuously attempt to separate the meshing teeth, while severe impact loads may instantly overcome the spring pressure, causing the linkage ring and tension wheel teeth to unexpectedly disengage. Once this unexpected unlocking occurs, the guide plate will retract under the chain tension, and the chain will loosen.

[0034] On the one hand, a loose chain bounces violently on the guide plate, failing to stably transmit cutting force, resulting in rough and uneven cuts and severely deteriorated cutting accuracy. On the other hand, large-scale abnormal swinging of the chain can easily cause it to detach from the guide plate track (derailment) or break under extreme stress. High-speed flying chain fragments or broken parts are like uncontrolled sharp blades, posing a fatal threat to the operator and surrounding personnel. In addition, when the chainsaw is under high load cutting hard materials, or when using a long handle (bar-type chainsaw), the vibration amplitude and energy generated by the equipment are even greater, multiplying the risk of tooth locking failure. The design flaws of the above-mentioned solution are therefore particularly prominent.

[0035] Therefore, embodiments of this application provide a chainsaw that can reduce the problem of tension failure caused by the disengagement of the push sub-component and the linkage sub-component. Some embodiments will be described below with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] Figure 1 A schematic diagram of the structure of the chainsaw 1 in this application embodiment. Figure 2 This is a schematic cross-sectional view of the structure of the tensioning component 13 according to an embodiment of this application and its arrangement on the main body 11. Figure 3 This is an exploded view of the tensioning component 13 according to an embodiment of this application.

[0037] like Figure 1 As shown, an embodiment of this application provides a chainsaw 1, which may include a body 11, a guide plate 12 connected to the body 11, and a tensioning assembly 13, wherein, as Figure 2 As shown, the main body 11 may include functional components such as a power assembly 110, a power supply assembly (not shown), and a housing 111. The guide plate 12 extends a certain length from the main body 11 and can be fitted with a chain 2. The tensioning assembly 13 can be used to push and lock the guide plate 12 along the extension direction of the guide plate 12 so that the chain 2 fitted on the guide plate 12 is tensioned.

[0038] like Figure 2 and Figure 3 As shown in the embodiments of this application, the tensioning assembly 13 may include a locking bolt 130, a push sub-assembly 134, a linkage sub-assembly 133, a knob sub-assembly 131, and an anti-loosening member 132. The locking bolt 130 can be connected to the main body 11 and extends axially; the knob sub-assembly 131 can be threadedly connected to the locking bolt 130; the linkage sub-assembly 133 can be connected to the knob sub-assembly 131 and rotates together with it; the push sub-assembly 134 can cooperate with the linkage sub-assembly 133 to adjust the position of the guide plate 12 relative to the main body 11; the anti-loosening member 132 can be connected to the knob sub-assembly 131, and can also be connected to the linkage sub-assembly 133 and abut against it axially so that the linkage sub-assembly 133 has a clamping force toward the push sub-assembly 134; the anti-loosening member 132 can be rotatably moved axially along the locking bolt 130 to adjust the clamping force. Thus, when the knob assembly 131 rotates relative to the locking bolt 130 via the thread, it can move along the axial direction of the locking bolt 130. The linkage assembly 133 can rotate together with the knob assembly 131. When the linkage assembly 133 rotates, it can drive the push assembly 134 to move, thereby adjusting the position of the guide plate 12 relative to the main body 11 by the push assembly 134. Furthermore, when it is necessary to lock the chainsaw 1, the clamping force between the linkage assembly 133 and the push assembly 134 can be adjusted by rotating the anti-loosening part 132 to lock it directly.

[0039] Furthermore, the anti-loosening element 132 can be at least partially located between the knob sub-assembly 131 and the linkage sub-assembly 133, and the clamping force applied when the anti-loosening element 132 is close to the linkage sub-assembly 133 can be greater than the clamping force applied when the anti-loosening element 132 is far away from the linkage sub-assembly 133. When the anti-loosening element 132 is at least partially located between the knob assembly 131 and the linkage sub-assembly 133, this at least partial location can give the linkage sub-assembly 133 a clamping force toward the pushing sub-assembly 134. At this time, the anti-loosening element 132, the knob assembly 131, and the linkage sub-assembly 133 can form a position-pressure linkage. In this case, when the anti-loosening element 132 is close to the linkage sub-assembly 133, the physical compression space decreases, forcing the clamping force to increase linearly; when it is far away, the compression space is released, and the clamping force weakens accordingly. The operator can steplessly adjust the clamping strength by rotating the anti-loosening element 132, which can intuitively match the working conditions of different vibration intensities, thereby reducing the locking failure caused by insufficient spring force in traditional solutions.

[0040] The chainsaw 1 of this embodiment achieves dynamic clamping force adjustment by setting an independent anti-loosening component 132, which can reduce the problem of insufficient vibration resistance of traditional fixed spring force. Specifically, the anti-loosening component 132 is connected to the knob sub-assembly 131. Its axial movement of the locking bolt 130 can directly change the clamping force acting on the linkage sub-assembly 133. When the anti-loosening component 132 is pushed forward axially, the clamping pressure is increased, and when it is pulled out, the pressure is reduced. The linkage sub-assembly 133 can rotate with the knob assembly 131, thereby driving the push sub-assembly 134 to adjust the position of the guide plate 12. That is, in the chainsaw 1 of this embodiment, the clamping force can be dynamically adjusted according to the working conditions by using the anti-loosening component 132. In the vibration environment of the chainsaw 1, the clamping force is actively strengthened, which can reduce the loosening of the chain 2 caused by the retraction of the guide plate 12.

[0041] Figure 4 This is a schematic diagram of the anti-loosening component 132 in an embodiment of this application. Figure 5 This is a structural schematic diagram of the anti-loosening member 132 from another perspective of an embodiment of this application.

[0042] In some embodiments, such as Figure 4 As shown, the anti-loosening component 132 may include an annular rotating part 1321 and a protruding ring 1322 formed on the annular rotating part 1321. The annular rotating part 1321 can be sleeved on the knob assembly 131, and when sleeved on the knob assembly 131, the threaded hole 1320 of the annular rotating part 1321 matches the thread 13121 of the knob assembly 131. The protruding ring 1322 can be used to abut against the linkage assembly 133. In this case, the protruding ring 1322 can convert the axial displacement of the anti-loosening component 132 into local high-pressure contact with the linkage assembly 133, thereby increasing the unit pressure by reducing the contact area and enhancing the locking reliability. The annular rotating part 1321 is sleeved on the knob assembly 131, thereby allowing it to rotate relative to the knob assembly 131. When it is necessary to lock the chainsaw 1, it can be directly locked by rotating the anti-loosening component 132, making the clamping force adjustment operation easier and smoother.

[0043] In some embodiments, such as Figure 5 As shown, the annular rotating part 1321 of the anti-loosening member 132 can be in the shape of a disc. A receiving groove 13211 can be formed on the side of the annular rotating part 1321 away from the linkage sub-assembly 133, and a protruding ring 1322 can be formed on the side of the annular rotating part 1321 near the linkage sub-assembly 133.

[0044] In some embodiments, the inner side of the annular rotating portion 1321 of the anti-loosening member 132 (i.e., the threaded hole 1320) may have threads, meaning that the annular rotating portion 1321 of the anti-loosening member 132 can be threaded onto the knob sub-assembly 131. In this case, the knob sub-assembly 131 moves axially along the locking bolt 130 by rotation. After the linkage sub-assembly 133 and the push sub-assembly 134 adjust the position of the guide plate 12 relative to the main body 11, the position of the knob sub-assembly 131 itself and the locking bolt 130 is also compressed to a certain degree under the action of the threads. At this time, the anti-loosening member 132 also follows the knob sub-assembly 131 to pre-lock the linkage sub-assembly 133 to this degree of compression. When the annular rotating portion 1321 of the anti-loosening member 132 rotates relative to the rotating sub-assembly through the threads, the degree of compression can be further increased, thereby achieving the purpose of adjusting the clamping force to lock.

[0045] Figure 6 This is a schematic diagram of the structure of the knob assembly 131 according to an embodiment of this application.

[0046] In some embodiments, such as Figure 6 As shown, the knob sub-assembly 131 may include a rotating part 1311 and a linkage part 1312 formed in the rotating part 1311. The anti-loosening member 132 may be sleeved on the end of the linkage part 1312 near the rotating part 1311. The linkage sub-assembly 133 may be disposed in the linkage part 1312. The end of the linkage part 1312 away from the rotating part 1311 may have a threaded hole 13123 that matches the locking bolt 130. In this case, the end of the linkage 1312 near the rotating part 1311 can be used to receive the anti-loosening part 132, which is dedicated to adjusting the clamping force; the end of the linkage 1312 away from the rotating part 1311 can be connected to the locking bolt 130 through the threaded hole 13123 for driving the displacement of the guide plate 12. When the anti-loosening part 132 is sleeved in a specific area of ​​the linkage 1312, its rotation adjustment only affects the clamping force and does not interfere with the threaded transmission path of the linkage 1312. From a physical structure perspective, this can reduce the misoperation caused by functional coupling. For example, if the anti-loosening part 132 is too close to the linkage sub-assembly 133, due to the small adjustment space, the linkage sub-assembly 133 and the push sub-assembly 134 have not fully adjusted the position of the guide plate 12 relative to the main body 11 under the drive of the knob sub-assembly 131, and the anti-loosening part 132 has been incorrectly locked.

[0047] In some embodiments, such as Figure 6As shown, the knob assembly 131 has multiple splines, which are referred to as "first splines 13122" for easy distinction. Specifically, multiple first splines 13122 can be formed on the surface of the end of the linkage part 1312 away from the rotating part 1311. The multiple first splines 13122 can be evenly distributed around the linkage part 1312. The first splines 13122 can be used to drive the linkage sub-assembly 133 to rotate synchronously with the knob assembly 131.

[0048] In some embodiments, such as Figure 6 As shown, the end of the linkage portion 1312 of the knob assembly 131 away from the rotating portion 1311 may have a groove 13124 formed therein, and the knob assembly 131 may also include a retaining ring 1310 (see...). Figure 3 As shown), the retaining ring 1310 can be set in the ring groove 13124. The retaining ring 1310 can be used to separate each component after the linkage sub-component 133 and the push sub-component 134 are successively assembled into the linkage part 1312, so that each component is connected into one, thereby reducing the problem of stability reduction caused by component falling off or detaching.

[0049] In the embodiments of this application, as described above, the side (i.e., the upper surface) of the annular rotating part 1321 away from the linkage sub-assembly 133 can form a receiving groove 13211. The receiving groove 13211 can match the rotating part 1311 of the knob sub-assembly 131, that is, the receiving groove 13211 can be used to accommodate the rotating part 1311 of the knob sub-assembly 131. Specifically, the upper surface of the annular rotating part 1321 can have a receiving groove 13211 of a size adapted to the knob sub-assembly 131. The rotating part 1311 of the knob assembly 131 is located in the receiving groove 13211, and the height of the upper surface of the knob assembly 131 can be less than or equal to the height of the receiving groove 13211. Thus, the rotating part 1311 of the knob assembly 131 can form a hidden layout, reducing space occupation.

[0050] In some embodiments, such as Figure 6As shown, the upper surface of the knob assembly 131 (i.e., the surface of the rotating part 1311 away from the linkage part 1312) can be provided with a hidden pull tab 13110. The hidden pull tab 13110 can be configured to rotate when pulled up, driving the entire knob assembly 131 to rotate. In this case, the structure of the hidden pull tab 13110 and the receiving groove 13211 can take into account both preventing accidental contact and protecting the components. The knob assembly 131 is recessed into the receiving groove 13211 of the annular rotating part 1321, so that the upper surface does not protrude from the anti-loosening member 132, thereby reducing damage from external impacts. The hidden pull tab 13110 is first pulled up to disengage from the protective position of the receiving groove 13211, and then used to rotate the rotating part 1311 to make the entire knob assembly 131 rotate. This dual operation step can reduce tension or locking failure caused by accidental contact at the source.

[0051] In some embodiments, the linkage portion 1312 of the knob assembly 131 near the rotating portion 1311 may have a thread 13121, which is used to engage with the threaded hole 1320 of the anti-loosening member 132 for sleeve connection.

[0052] In some embodiments, the linkage portion 1312 of the knob assembly 131 may have a threaded hole 13123, which can be used to engage with the locking bolt 130 for threaded connection.

[0053] Figure 7 This is a schematic diagram of the tensioning linkage ring 1332 of the linkage sub-component 133 in an embodiment of this application.

[0054] In some embodiments, such as Figure 3 As shown, the linkage sub-assembly 133 may include a tension spring 1331 and a tension linkage ring 1332. The tension spring 1331 may be sleeved on the tension linkage ring 1332. The anti-loosening member 132 may abut against the tension spring 1331 to give the tension linkage ring 1332 a clamping force toward the pushing sub-assembly 134, i.e., the tension linkage ring 1332 may have a holding portion 13321 that abuts against the tension spring 1331 (see...). Figure 7As shown, the holding portion 13321 can be formed by protruding one end of the tensioning linkage ring 1332 near the push sub-assembly 134. The anti-loosening member 132 abuts against one end of the tension spring 1331, and the other end of the tension spring 1331 abuts against the holding portion 13321 of the tensioning linkage ring 1332. Thus, under the action of the anti-loosening member 132 and the tension spring 1331, the tensioning linkage ring 1332 can have a clamping force that moves toward the push sub-assembly 134. The tensioning linkage ring 1332 can be sleeved on the knob sub-assembly 131. In this case, the anti-loosening member 132 can transmit the adjustable clamping force to the tensioning linkage ring 1332 by compressing the tension spring 1331, continuously counteracting the separation effect of vibration on the linkage sub-assembly 133 and the push sub-assembly 134.

[0055] In some embodiments, such as Figure 7 As shown, the tensioning linkage ring 1332 can be formed with multiple face teeth, which are referred to as "first face teeth 13322" for easy distinction. Specifically, the end face of the tensioning linkage ring 1332 that contacts the push sub-assembly 134 can be formed with multiple first face teeth 13322. The multiple first face teeth 13322 can be evenly distributed around the axis of the tensioning linkage ring 1332. The first face teeth 13322 can be used to drive the push sub-assembly 134 to rotate synchronously with the linkage sub-assembly 133.

[0056] In some embodiments, such as Figure 7 As shown, the linkage sub-assembly 133 can also form multiple splines, referred to as "second splines 13323". Specifically, the inner surface of the tensioning linkage ring 1332 of the linkage sub-assembly 133 can form multiple second splines 13323 that mate with the first spline 13122. In this case, the rotation synchronization of the knob sub-assembly 131 and the linkage sub-assembly 133 can be achieved through the spline structure. The first spline 13122 of the knob assembly 131 meshes with the second spline 13323 of the linkage sub-assembly 133, ensuring that the two rotate strictly synchronously and maintaining the spline alignment accuracy. In addition, the spline grooves between the second splines 13323 allow the linkage sub-assembly 133 to slide freely axially, thereby reducing interference with the clamping force adjustment of the anti-loosening element 132 when the knob is rotated.

[0057] Figure 8 This is a schematic diagram of the structure of the pusher sub-component 134 in an embodiment of this application.

[0058] In some embodiments, the pusher sub-component 134 can be configured to move the guide plate 12 away from the main body 11, specifically, such as Figure 8As shown, the pusher assembly 134 may include an annular fixing portion 1341 and a helical wheel 1342 formed on the annular fixing portion 1341. The helical wheel 1342 may have a gradually increasing diameter. In this case, the helical wheel 1342 can convert the rotational motion of the pusher assembly 134 into a linear thrust in the extending direction of the guide plate 12, thereby driving the guide plate 12 to move through inclined plane mechanics.

[0059] In some embodiments, such as Figure 8 As shown, the annular fixing part 1341 can be formed with multiple face teeth, referred to as "second face teeth 13411". Specifically, the end face of the annular fixing part 1341 near the tensioning linkage ring 1332 can be formed with multiple second face teeth 13411 that engage with the first face teeth 13322. In this case, the rotational synchronization of the linkage sub-assembly 133 and the push sub-assembly 134 can be achieved through the face tooth structure. The first face teeth 13322 of the linkage sub-assembly 133 mesh with the second face teeth 13411 of the push sub-assembly 134 to ensure that the two rotate strictly synchronously and maintain the face tooth alignment accuracy.

[0060] Figure 9 This is a schematic diagram of the structure of the guide plate pusher 135 according to an embodiment of this application.

[0061] In some embodiments, the tensioning assembly 13 may further include a guide plate pusher 135, which may be disposed on the guide plate 12, such as... Figure 9 As shown, the guide plate pusher 135 has a protrusion 1351, which can abut against the pusher assembly 134. The protrusion 1351 can be configured to move away from the main body 11 under the drive of the pusher assembly 134. Specifically, the protrusion 1351 can abut against the helical wheel 1342, and the protrusion 1351 is configured to move away from the main body 11 under the drive of the helical wheel 1342. In this case, the protrusion 1351 can serve as the direct contact point between the pusher assembly 134 (or the helical wheel 1342) and the guide plate 12, converting the concentrated load into the translational displacement of the guide plate 12, and reducing off-center friction by utilizing the leverage effect. In addition, the rigid connection between the protrusion 1351 and the guide plate 12 can reduce the deformation loss of the intermediate force transmission link, ensuring rapid tension adjustment response and accurate displacement.

[0062] In some embodiments, such as Figure 9 As shown, the guide plate push block 135 may also have a retaining part 1352. The retaining part 1352 is formed at one end of the guide plate push block 135 near the tensioning assembly 13 and is bent toward the guide plate 12. The retaining part 1352 can be used to hold the guide plate 12 in the opposite direction (opposite to the pushing direction when tensioning the chainsaw 1) when the guide plate push block 135 pushes against the guide plate 12, so as to improve the stability of the guide plate push block 135 and the guide plate 12 during the tensioning process.

[0063] In other embodiments, the guide plate pusher 135 may be unnecessary, or the guide plate pusher 135 may be directly formed on the guide plate 12. For example, a protrusion 1351 that abuts against the spiral wheel 1342 may be directly provided on the guide plate 12. The protrusion 1351 is configured to move away from the main body 11 under the drive of the spiral wheel 1342.

[0064] In some embodiments, the guide plate 12 may have a hollow portion, through which the locking bolt 130 can be connected to the main body 11. By providing the hollow portion, the tensioning assembly 13 can be positioned in the central symmetrical region of the guide plate 12, thereby improving the symmetry and stability of tensioning or locking the chainsaw 1. Similarly, when the guide plate 12 is provided with a guide plate pusher 135, the guide plate pusher 135 may also have a hollow portion so that the locking bolt 130 can be connected to the main body 11 through the hollow portion.

[0065] In some embodiments, as described above, the chainsaw 1 may include a housing 111, which may be used to mount a power unit 110 (such as...). Figure 3 The housing 111a and tensioning assembly 13 shown are as follows: Figure 3 As shown in the housing 111b, the portion of the housing 111b where the tensioning assembly 13 is installed (i.e., the housing 111b) may have an opening. Specifically, the portion of the housing 111b near the anti-loosening member 132 may have an opening that allows the operator to easily rotate the anti-loosening member 132 to lock and prevent loosening of the chainsaw 1.

[0066] In this application, the clamping force acting on the linkage sub-assembly 133 is directly controlled by the rotatable axial movement of the independent anti-loosening component 132 (such as the annular rotating part 1321 with a raised ring 1322). The clamping force increases when the anti-loosening component 132 is close to the linkage sub-assembly 133 and decreases when it is far away. This can effectively reduce the defects of insufficient clamping force of traditional single spring. Under the high-load vibration condition of chainsaw 1, the locking force can be actively enhanced, which can reduce the risk of chain 2 loosening due to guide plate 12 retraction from the root.

[0067] In addition, while retaining the connection between the tensioning linkage ring 1332 and the push sub-assembly 134 to achieve rigid positioning, a pressure compensation system consisting of an anti-loosening component 132 and a tensioning spring 1331 is added. The adjustable clamping force applied by the anti-loosening component 132 forms a continuous flexible constraint. The dual mechanism works together to suppress the micro-displacement caused by vibration and impact, which can significantly improve the positional stability of the guide plate 12. This not only maintains the cutting accuracy but also greatly reduces the safety hazard of chain 2 derailment or breakage.

[0068] In addition, the knob assembly 131 is responsible for driving the guide plate 12 to move to adjust the tension of the chain 2, while the anti-loosening component 132 independently undertakes the function of adjusting the clamping force. The two are physically separated by the sleeve structure and their operation does not interfere with each other. This can reduce the risk of the knob operation accidentally changing the locking pressure in the traditional solution, ensure the stable and reliable locking state, and at the same time continue the advantage of tool-free quick adjustment, taking into account both the convenience of operation and the long-term reliability of the system.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A chainsaw, comprising a body, a guide plate connected to the body, and a tensioning assembly, characterized in that, The tensioning assembly includes a locking bolt, a push sub-assembly, a linkage sub-assembly, a knob assembly, and an anti-loosening component; The locking bolt is connected to the body and extends axially; The knob sub-assembly is threadedly connected to the locking bolt, and the linkage sub-assembly is connected to the knob assembly and rotates together with the knob assembly; The push sub-assembly cooperates with the linkage sub-assembly to adjust the position of the guide plate relative to the main body; The anti-loosening element connects to the linkage sub-assembly and abuts against the linkage sub-assembly in the axial direction to give the linkage sub-assembly a clamping force toward the push sub-assembly; the anti-loosening element is rotatably movable along the axial direction to adjust the clamping force.

2. The chainsaw according to claim 1, characterized in that, The anti-loosening element is at least partially located between the knob sub-assembly and the linkage sub-assembly, and the clamping force applied by the anti-loosening element when it is close to the linkage sub-assembly is greater than the clamping force applied by the anti-loosening element when it is far away from the linkage sub-assembly.

3. The chainsaw according to claim 1, characterized in that, The anti-loosening component includes an annular rotating part and a protruding ring formed on the annular rotating part. The annular rotating part is sleeved on the knob sub-assembly, and the protruding ring is used to abut against the linkage sub-assembly.

4. The chainsaw according to claim 1, characterized in that, The knob sub-assembly includes a rotating part and a linkage part formed on the rotating part. The anti-loosening member is sleeved on the end of the linkage part near the rotating part. The linkage sub-assembly is disposed on the linkage part. The end of the linkage part away from the rotating part has a threaded hole that matches the locking bolt.

5. The chainsaw according to claim 1, characterized in that, The linkage sub-assembly includes a tension spring and a tension linkage ring; The tension spring is sleeved on the tension linkage ring, and the anti-loosening member abuts against the tension spring to give the tension linkage ring a clamping force toward the push sub-assembly; The tensioning linkage ring is sleeved on the knob sub-assembly. The end face of the tensioning linkage ring that contacts the push sub-assembly has a plurality of first teeth. The push sub-assembly has a plurality of second teeth that cooperate with the first teeth.

6. The chainsaw according to claim 5, characterized in that, The pusher sub-assembly is configured to drive the guide plate away from the main body. The pusher sub-assembly includes an annular fixing part and a spiral wheel formed in the annular fixing part. The annular fixing part has a second tooth formed on its end face near the tensioning linkage ring.

7. The chainsaw according to claim 1, characterized in that, The knob sub-assembly has a plurality of first splines, and the linkage sub-assembly has a plurality of second splines that cooperate with the first splines.

8. The chainsaw according to claim 1 or 6, characterized in that, It also includes a guide plate pusher block, which is disposed on the guide plate. The guide plate pusher block has a protrusion that abuts against the pusher sub-assembly. The protrusion is configured to move away from the main body under the drive of the pusher sub-assembly.

9. The chainsaw according to claim 6, characterized in that, It also includes a guide plate pusher block, which is disposed on the guide plate. The guide plate pusher block has a protrusion that abuts against the spiral wheel. The protrusion is configured to move away from the main body under the drive of the spiral wheel.

10. The chainsaw according to claim 3, characterized in that, The upper surface of the annular rotating part has a receiving groove that is adapted to the size of the knob sub-assembly. The knob sub-assembly is located in the receiving groove and the height of the upper surface of the knob sub-assembly is less than or equal to the height of the receiving groove. The upper surface of the knob sub-assembly is provided with a hidden pull buckle, which is configured to rotate when pulled up and drive the entire knob sub-assembly to rotate.

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