Rotating body mounting structure and chain saw

Abstract

The application provides a rotating body mounting structure and a chain saw, and relates to the technical field of mechanical transmission. The rotating body mounting structure comprises an inner sleeve body, an outer sleeve body and a fastening sleeve. The first end of the inner sleeve body is provided with a connecting hole groove for sleeving on a driving shaft, and the outer surface of the second end of the inner sleeve body is provided with an outer thread section. A first conical surface is arranged on the outer surface of the inner sleeve body. The outer sleeve body is sleeved on the outer periphery of the first conical surface, and the inner hole of the outer sleeve body is provided with a second conical surface matched with the first conical surface. The outer sleeve body is used for being mounted into the inner ring of a rotating body. Based on the thread cooperation, the fastening sleeve can be axially moved and adjusted in the direction of the first end of the inner sleeve body to extrude the outer sleeve body, so that the second conical surface of the outer sleeve body is pressed against the first conical surface of the inner sleeve body, and then the inner sleeve body is pressed inwardly against the driving shaft, and the outer sleeve body is pressed outwardly against the inner ring of the rotating body. The rotating body mounting structure provided in the application can realize overload protection and avoid damage to the motor.

Description

Technical Field

[0001] This application relates to the field of mechanical transmission technology, and in particular to a rotating body mounting structure and a chainsaw. Background Technology

[0002] Chainsaws have lateral cutting capabilities and are used for cutting materials such as concrete, rock, pipes, and masonry. For example, Chinese patent CN202010018046.1 discloses a hydraulic chainsaw in which a hydraulic motor drives the chainsaw assembly. The chainsaw sprocket is mounted on the motor's output shaft. Currently, chainsaw sprockets use key connections; however, key connections may damage the motor when encountering significant cutting resistance. Summary of the Invention

[0003] The technical problem to be solved by this application is to provide a rotating body mounting structure and a chainsaw, addressing the aforementioned shortcomings of the prior art.

[0004] A rotating body mounting structure is provided for mounting a rotating body onto a drive shaft; the rotating body mounting structure includes:

[0005] The inner sleeve has a connecting hole groove at its first end for fitting onto the drive shaft, and an external thread section on the outer surface of its second end; a first tapered surface is provided on the outer surface of the inner sleeve; the first tapered surface corresponds to the axial position of the connecting hole groove; the diameter of the cross-sectional circle of the first tapered surface shrinks as it approaches the second end.

[0006] An outer sleeve is fitted around the outer periphery of the first conical surface, and its inner hole is provided with a second conical surface that is adapted to the first conical surface; the outer sleeve is used to be inserted into the inner ring of the rotating body;

[0007] A fastening sleeve is installed at the second end of the inner sleeve and forms a threaded engagement with the external threaded section of the inner sleeve. Based on the threaded engagement, the fastening sleeve can be axially moved towards the first end of the inner sleeve to adjust and squeeze the outer sleeve so that the second conical surface of the outer sleeve presses against the first conical surface of the inner sleeve, thereby causing the inner sleeve to press the drive shaft inward and the outer sleeve to press the inner ring of the rotating body outward.

[0008] In an improved technical solution, the outer shell is composed of multiple independent fan-shaped structures distributed circumferentially.

[0009] In an improved technical solution, each of the plurality of sector-shaped structures has the same sector angle.

[0010] In an improved technical solution, the outer shell is composed of three independent fan-shaped structures distributed circumferentially.

[0011] In an improved technical solution, a first circumferential groove is provided around the outer sleeve at one end near the fastening sleeve, and the first circumferential groove is composed of a sub-groove on each fan-shaped structure.

[0012] The fastening sleeve is provided with a second circumferential hook portion; the second hook portion is adapted to fit into the first circumferential groove on the outer sleeve, and the second hook portion is fitted together with the sub-groove on each fan-shaped structure.

[0013] In an improved technical solution, a first hook portion is provided around the outer sleeve at one end near the fastening sleeve, and the first hook portion is composed of a segment of the hook portion on each fan-shaped structure.

[0014] The fastening sleeve is provided with a second circumferential groove; the second circumferential groove is adapted to the first hook portion on the outer sleeve so that the first hook portion can be inserted, and the second circumferential groove is fitted together with the sub-hook portion on each fan-shaped structure.

[0015] In an improved technical solution, when the fastening sleeve moves axially towards the first end of the inner sleeve to squeeze the outer sleeve, the second hook portion contacts and squeezes the inner wall of the first circumferential groove, while the inner wall of the second circumferential groove contacts and squeezes the first hook portion.

[0016] In an improved technical solution, at the end away from the fastening sleeve, the end of the outer sleeve is provided with a limiting flange protruding from the second conical surface.

[0017] In an improved technical solution, a plurality of gap grooves penetrating the inner and outer structures are arranged on the first conical surface of the inner sleeve; the gap grooves extend along the axial direction of the inner sleeve.

[0018] On the other hand, this application also provides a chainsaw including the aforementioned rotating body mounting structure for mounting a sprocket to the drive shaft of a motor.

[0019] In this application, the first conical surface on the inner sleeve mates with the second conical surface on the outer sleeve. Driven by the fastening sleeve, the second conical surface of the outer sleeve presses against the first conical surface of the inner sleeve, thereby causing the inner sleeve to press inward against the drive shaft and the outer sleeve to press outward against the inner ring of the rotating body. Thus, the rotating body is mounted onto the drive shaft through the rotating body mounting structure. The technical solution of this application achieves a keyless connection through the conical surface mating between the inner and outer sleeves and the internal and external expansion, allowing relative sliding under extreme loads, thereby achieving overload protection.

[0020] In some improved technical solutions, the outer sleeve has a first circumferential groove, and the fastening sleeve has a second circumferential hook. The second hook is adapted to fit into the first circumferential groove on the outer sleeve. The second hook and the first circumferential groove form an axial connection between the outer sleeve and the fastening sleeve. When the fastening sleeve is loosened and removed, the outer sleeve retracts simultaneously, separating from the inner sleeve, thus achieving disassembly. The disassembly process only requires loosening the fastening sleeve in the reverse direction, making the operation very convenient.

[0021] In some improved technical solutions, the outer casing is composed of multiple independent fan-shaped structures distributed circumferentially, which facilitates outward expansion when the internal second conical surface is compressed, and simplifies assembly and disassembly. Furthermore, the second hook engages with the sub-grooves on each fan-shaped structure, ensuring that the various fan-shaped structures constituting the outer casing can move axially synchronously—that is, synchronously clamp and retract—ensuring a more uniform circumferential distribution of clamping force and making the entire connection structure more reliable. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the rotating body mounting structure in the embodiments of this application.

[0023] Figure 2 This is an exploded structural diagram of the rotating body mounting structure in the embodiments of this application.

[0024] Figure 3 This is a schematic diagram of the inner sleeve in an embodiment of this application.

[0025] Figure 4 This is a schematic diagram of the outer shell structure in an embodiment of this application.

[0026] Figure 5 This is a schematic diagram of the fan-shaped structure in an embodiment of this application.

[0027] Figure 6 This is a schematic diagram of the fastening sleeve in an embodiment of this application.

[0028] Figure 7 This is a schematic diagram of the rotating body in an embodiment of this application.

[0029] The rotating body mounting structure 100, inner sleeve 110, connecting hole groove 111, external thread section 112, first conical surface 113, gap groove 114, outer sleeve 120, second conical surface 121, fan-shaped structure 122, first circumferential groove 123, sub-groove 122a, first hook part 124, sub-hook part 122b, limiting flange 125, fastening sleeve 130, second hook part 131, second circumferential groove 132, rotating body 200, motor 300, drive shaft 310. Detailed Implementation

[0030] The following are specific embodiments of this application, described in conjunction with the accompanying drawings, to further illustrate the technical solutions of this application. However, this application is not limited to these embodiments. In the following description, specific details such as particular configurations and components are provided merely to aid in a comprehensive understanding of the embodiments of this application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. Furthermore, for clarity and brevity, descriptions of known functions and structures have been omitted.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0032] This application provides a rotating body mounting structure 100 for mounting a rotating body 200 onto a drive shaft 310. In a specific example, such as Figure 1 , Figure 2 and Figure 7 As shown, the rotating body 200 is a sprocket, mounted on the drive shaft 310 of the motor 300. When the drive shaft 310 of the motor 300 outputs power, the power is transmitted to the sprocket through the rotating body mounting structure 100. This power unit can be applied to chainsaws and can be used for cutting materials such as concrete, rock, pipes, and brick. The technical solution of this application achieves a keyless connection through the conical fit between the inner and outer sleeves and the internal and external expansion, allowing relative sliding under extreme loads, thereby achieving overload protection. The rotating body mounting structure 100 will be described in detail below with reference to the accompanying drawings.

[0033] refer to Figures 1 to 6The rotating body mounting structure 100 includes an inner sleeve 110, an outer sleeve 120, and a fastening sleeve 130. The inner sleeve 110 has a connecting groove 111 at its first end for fitting onto the drive shaft 310, and an external thread section 112 on its outer surface at its second end. A first tapered surface 113 is provided on the outer surface of the inner sleeve 110; the first tapered surface 113 corresponds axially to the connecting groove 111; the diameter of the cross-sectional circle of the first tapered surface 113 decreases along the direction near the second end. The outer sleeve 120 is fitted around the outer periphery of the first tapered surface 113, and its inner hole has a second tapered surface 121 adapted to the first tapered surface 113; the outer sleeve 120 is used to be inserted into the inner ring of the rotating body. The fastening sleeve 130 is installed at the second end of the inner sleeve 110 and forms a threaded engagement with the external thread section 112 of the inner sleeve 110. Based on the threaded engagement, the fastening sleeve 130 can be axially moved towards the first end of the inner sleeve 110 to squeeze the outer sleeve 120 so that the second tapered surface 121 of the outer sleeve 120 presses against the first tapered surface 113 of the inner sleeve 110, thereby causing the inner sleeve 110 to press the drive shaft 310 inward and the outer sleeve 120 to press the inner ring of the rotating body 200 outward.

[0034] refer to Figures 1 to 3 The first end of the inner sleeve 110 is the end closest to the motor 300, that is... Figure 1 As shown on the right end, the connecting slot 111 at the first end of the inner sleeve 110 is fitted onto the drive shaft 310 of the motor 300. Specifically, the connecting slot 111 of the inner sleeve 110 is a circular hole, machined at the first end. An external thread section 112 is machined on the exterior of the second end of the inner sleeve 110. A first tapered surface 113 is also machined on the outer surface of the inner sleeve 110. The first tapered surface 113 corresponds to the axial position of the connecting slot 111, and the closer to the second end, the smaller the diameter of the cross-sectional circle of the first tapered surface 113. It should be noted that the axial position of the first tapered surface 113 and the connecting slot 111 does not need to be strictly consistent. Figure 1 As shown, the axial length of the first conical surface 113 is entirely within the axial range of the connecting groove 111. In some cases, the axial length of the first conical surface 113 may exceed the axial range of the connecting groove 111, as long as the axial ranges of the two are approximately the same, to ensure that when the first conical surface 113 is under pressure, the pressure can be smoothly transmitted to the connecting groove 111.

[0035] refer to Figure 4The outer sleeve 120 is used to be inserted into the inner ring of the rotating body. The outer sleeve 120 is fitted around the outer periphery of the first conical surface 113, and a second conical surface 121 is provided in its inner hole. The second conical surface 121 of the outer sleeve 120 is adapted to the first conical surface 113 of the inner sleeve 110 and can fit against the first conical surface 113 of the inner sleeve 110.

[0036] refer to Figure 1 and Figure 6 The fastening sleeve 130 is installed at the second end of the inner sleeve 110, forming a threaded engagement with the external threaded section 112 of the inner sleeve 110. When the fastening sleeve 130 is rotated in the forward direction, the fastening sleeve 130 translates axially toward the first end of the inner sleeve 110, that is, toward... Figure 1 The fastening sleeve 130 shifts to the right, at which point the fastening sleeve 130 presses the outer sleeve 120 to the right, causing the second conical surface 121 of the outer sleeve 120 to press against the first conical surface 113 of the inner sleeve 110. Due to the action of the conical surface, the outer sleeve 120 expands outward, while the inner sleeve 110 contracts inward. The inner sleeve 110 presses against the drive shaft 310 inward, and the outer sleeve 120 presses against the inner ring of the rotating body 200 outward. Thus, the entire rotating body mounting structure 100, as a whole, presses against the rotating body 200 outward and against the drive shaft 310 inward, forming a connection between the drive shaft 310 and the rotating body 200. Based on this connection, the rotating body 200 can rotate under the drive of the drive shaft 310.

[0037] When the fastening sleeve 130 is rotated in the reverse direction, the fastening sleeve 130 translates axially away from the first end of the inner sleeve 110, that is, towards Figure 1 Due to the characteristics of the conical surface, the inner sleeve 110 loses its clamping force with the drive shaft 310, and the outer sleeve 120 loses its clamping force with the inner ring of the rotating body 200. Thus, the rotating body 200 loses its power connection with the drive shaft 310.

[0038] refer to Figure 2 , Figure 4 and Figure 5 In this embodiment, the outer casing 120 is composed of multiple independent fan-shaped structures 122 distributed circumferentially. The specific number of fan-shaped structures 122 constituting one outer casing 120 can be 2, 3, 4, 5, 6, 7, 8, 9, ... . Figure 4 As shown, in a specific example, the outer shell 120 is composed of three independent fan-shaped structures 122 distributed circumferentially.

[0039] Furthermore, each of the multiple sector-shaped structures 122 has the same sector angle. When an outer casing 120 contains two sector-shaped structures 122, each sector-shaped structure 122 approximately occupies a 180° angle range of the entire outer casing. When an outer casing 120 contains three sector-shaped structures 122, each sector-shaped structure 122 approximately occupies a 120° angle range of the entire outer casing. When an outer casing 120 contains four sector-shaped structures 122, each sector-shaped structure 122 approximately occupies a 90° angle range of the entire outer casing. Following this pattern, when an outer casing 120 contains n sector-shaped structures 122, each sector-shaped structure 122 approximately occupies a 360° / n angle range of the entire outer casing.

[0040] It should be understood that when the outer casing 120 is composed of multiple independent fan-shaped structures 122 distributed circumferentially, it is convenient for the outer casing 120 to expand outward when the second conical surface 121 inside is compressed, and it makes the assembly and disassembly of the outer casing 120 simpler.

[0041] refer to Figure 1 , Figure 4 and Figure 5 In one embodiment of this application, a first circumferential groove 123 is provided around the outer sleeve 120 near one end of the fastening sleeve 130, and the first circumferential groove 123 is composed of a sub-groove 122a on each fan-shaped structure 122. The fastening sleeve 130 is provided with a second circumferential hook portion 131; the second hook portion 131 is adapted to fit into the first circumferential groove 123 on the outer sleeve 120, and the second hook portion 131 is engaged with the sub-groove 122a on each fan-shaped structure 122.

[0042] During assembly, the second hook portion 131 on the fastening sleeve 130 is engaged in the first circumferential groove 123 of the outer sleeve 120. The second hook portion 131 and the first circumferential groove 123 form an axial connection between the outer sleeve 120 and the fastening sleeve 130. When the fastening sleeve 130 is loosened and removed, the outer sleeve 120 moves backward simultaneously, and the outer sleeve 120 separates from the inner sleeve 110, thus achieving disassembly. The above disassembly process only requires loosening the fastening sleeve in the reverse direction, which is very convenient.

[0043] In addition, the second hook portion 131 of the fastening sleeve 130 is fitted together with the sub-groove 122a on each sector structure 122, which can ensure that each sector structure 122 used to form the outer sleeve 120 can move axially synchronously, that is, synchronously press and synchronously withdraw, ensuring that the pressing force of the conical surface is more evenly distributed along the circumference, and the entire connection structure is more reliable.

[0044] Continue to refer to Figure 1 , Figure 4 and Figure 5 In one embodiment of this application, a first hook portion 124 is provided circumferentially along the outer sleeve 120 near one end of the fastening sleeve 130, and the first hook portion 124 is composed of a sub-hook portion 122b on each fan-shaped structure 122. A second circumferential groove 132 is provided on the fastening sleeve 130; the second circumferential groove 132 is adapted to the first hook portion 124 on the outer sleeve 120 for the first hook portion 124 to be inserted, and the second circumferential groove 132 is engaged with the sub-hook portion 122b on each fan-shaped structure 122.

[0045] During assembly, the second circumferential groove 132 of the fastening sleeve 130 engages with the first hook portion 124 on the outer sleeve 120, while the second hook portion 131 on the fastening sleeve 130 engages with the first circumferential groove 123 on the outer sleeve 120, thus forming an interlocking engagement relationship, resulting in a tighter axial connection between the outer sleeve 120 and the fastening sleeve 130.

[0046] In this embodiment, when the fastening sleeve 130 moves axially towards the first end of the inner sleeve 110 to press the outer sleeve 120, the second hook portion 131 contacts and presses the inner wall of the first circumferential groove 123, while the inner wall of the second circumferential groove 132 contacts and presses the first hook portion 124. Here, the axial pressing force of the fastening sleeve 130 on the outer sleeve 120 includes two parts: one part is the pressing force of the second hook portion 131 of the fastening sleeve 130 on the inner wall of the first circumferential groove 123 of the outer sleeve 120, and the other part is the pressing force of the inner wall of the second circumferential groove 132 of the fastening sleeve 130 on the first hook portion 124 of the outer sleeve 120. Applying pressure at both points simultaneously increases the pressing area, which helps to reduce stress and can increase the ultimate pressing force, thereby pressing the outer sleeve 120 tighter and making the installation between the rotating body 200 and the drive shaft more reliable.

[0047] refer to Figure 1 and Figure 4 In an embodiment of this application, at the end furthest from the fastening sleeve 130, the end of the outer sleeve 120 is provided with a limiting flange 125 protruding from the second conical surface 121. The limiting flange 125 can limit the outer sleeve 120 and the rotating body 200, preventing the outer sleeve 120 from disengaging from the outer ring of the rotating body 200.

[0048] refer to Figure 3In the embodiments of this application, a plurality of gap grooves 114 penetrating the inner and outer structures are arranged on the first conical surface 113 of the inner sleeve 110; the gap grooves 114 extend along the axial direction of the inner sleeve 110. The gap grooves 114 provided here allow the inner sleeve 110 to shrink more easily, so as to better press it onto the drive shaft of the motor.

[0049] This application embodiment also provides a chainsaw, including the aforementioned rotating body mounting structure, which is used to mount a sprocket to the drive shaft 310 of a motor 300. For the chainsaw, the rotating body 200 is a sprocket, mounted on the drive shaft 310 of the chainsaw's motor 300. The rotating body mounting structure 100 includes an inner sleeve 110, an outer sleeve 120, and a fastening sleeve 130. The inner sleeve 110 has a first end with a connecting slot 111 for fitting onto the drive shaft 310, and its second end has an external thread section 112 on its outer surface. A first tapered surface 113 is provided on the outer surface of the inner sleeve 110; the first tapered surface 113 corresponds axially to the connecting slot 111; the diameter of the cross-sectional circle of the first tapered surface 113 decreases along the direction near the second end. The outer sleeve 120 is fitted around the outer periphery of the first conical surface 113, and its inner hole has a second conical surface 121 adapted to the first conical surface 113; the outer sleeve 120 is used to be inserted into the inner ring of the rotating body. A fastening sleeve 130 is installed at the second end of the inner sleeve 110 and forms a threaded engagement with the external thread section 112 of the inner sleeve 110; based on this threaded engagement, the fastening sleeve 130 can be axially moved towards the first end of the inner sleeve 110 to adjust and compress the outer sleeve 120, causing the second conical surface 121 of the outer sleeve 120 to press against the first conical surface 113 of the inner sleeve 110, thereby causing the inner sleeve 110 to press inward against the drive shaft 310, and the outer sleeve 120 to press outward against the inner ring of the rotating body 200. When the key connection encounters significant cutting resistance, the rotating body mounting structure 100 can provide overload protection to prevent damage to the motor.

[0050] In this application, the first conical surface 113 on the inner sleeve 110 engages with the second conical surface 121 on the outer sleeve 120. Driven by the fastening sleeve 130, the second conical surface 121 of the outer sleeve 120 presses against the first conical surface 113 of the inner sleeve 110, thereby causing the inner sleeve 110 to press inward against the drive shaft and the outer sleeve 120 to press outward against the inner ring of the rotating body. Thus, the rotating body is mounted onto the drive shaft through the rotating body mounting structure. The technical solution of this application achieves a keyless connection through the conical surface engagement between the inner sleeve 110 and the outer sleeve 120, and the internal and external expansion, allowing relative sliding under extreme loads, thereby achieving overload protection.

[0051] In some improved technical solutions, the outer sleeve 120 is provided with a first circumferential groove 123, and the fastening sleeve 130 is provided with a second circumferential hook portion 131; the second hook portion 131 is adapted to fit into the first circumferential groove 123 on the outer sleeve 120. The second hook portion 131 and the first circumferential groove 123 form an axial connection between the outer sleeve 120 and the fastening sleeve 130. When the fastening sleeve 130 is loosened and removed, the outer sleeve 120 retracts simultaneously, separating from the inner sleeve 110, thus achieving disassembly. The above disassembly process only requires loosening the fastening sleeve 130 in the reverse direction, which is very convenient.

[0052] In some improved technical solutions, the outer casing 120 is composed of multiple independent fan-shaped structures 122 distributed circumferentially, which facilitates outward expansion when the internal second conical surface 121 is compressed, and makes assembly and disassembly simpler. In addition, the second hook portion 131 is engaged with the sub-grooves on each fan-shaped structure 122, which ensures that the various fan-shaped structures 122 constituting the outer casing 120 can move axially synchronously, that is, synchronously press and synchronously retract, ensuring that the pressing force is more evenly distributed circumferentially, and the entire connection structure is more reliable.

[0053] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0054] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] The specific embodiments described herein are merely illustrative examples of the spirit of this application. Those skilled in the art to which this application pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this application or exceeding the scope defined by the appended claims.

Claims

1. A rotating body mounting structure, characterized in that, The rotating body mounting structure is used to mount the rotating body onto the drive shaft; the rotating body mounting structure includes: The inner sleeve has a connecting hole groove at its first end for fitting onto the drive shaft, and an external thread section on the outer surface of its second end; a first tapered surface is provided on the outer surface of the inner sleeve; the first tapered surface corresponds to the axial position of the connecting hole groove; the diameter of the cross-sectional circle of the first tapered surface shrinks as it approaches the second end. An outer sleeve is fitted around the outer periphery of the first conical surface, and its inner hole is provided with a second conical surface that is adapted to the first conical surface; the outer sleeve is used to be inserted into the inner ring of the rotating body; A fastening sleeve is installed at the second end of the inner sleeve and forms a threaded engagement with the external threaded section of the inner sleeve. Based on the threaded engagement, the fastening sleeve can be axially moved towards the first end of the inner sleeve to adjust and squeeze the outer sleeve so that the second conical surface of the outer sleeve presses against the first conical surface of the inner sleeve, thereby causing the inner sleeve to press the drive shaft inward and the outer sleeve to press the inner ring of the rotating body outward.

2. The rotating body mounting structure according to claim 1, characterized in that, The outer shell is composed of multiple independent fan-shaped structures distributed circumferentially.

3. The rotating body mounting structure according to claim 2, characterized in that, In the plurality of sector-shaped structures, each sector-shaped structure has the same sector angle.

4. The rotating body mounting structure according to claim 3, characterized in that, The outer shell is composed of three independent fan-shaped structures distributed circumferentially.

5. The rotating body mounting structure according to any one of claims 2-4, characterized in that, At one end near the fastening sleeve, a first circumferential groove is provided along the circumference of the outer sleeve, and the first circumferential groove is composed of a sub-groove on each fan-shaped structure. The fastening sleeve is provided with a second circumferential hook portion; the second hook portion is adapted to fit into the first circumferential groove on the outer sleeve, and the second hook portion is fitted together with the sub-groove on each fan-shaped structure.

6. The rotating body mounting structure according to claim 5, characterized in that, At one end near the fastening sleeve, a first hook portion is provided around the outer sleeve in a circumferential direction, and the first hook portion is composed of a segment of hook portion on each fan-shaped structure; The fastening sleeve is provided with a second circumferential groove; the second circumferential groove is adapted to the first hook portion on the outer sleeve so that the first hook portion can be inserted, and the second circumferential groove is fitted together with the sub-hook portion on each fan-shaped structure.

7. The rotating body mounting structure according to claim 6, characterized in that, When the fastening sleeve moves axially towards the first end of the inner sleeve to squeeze the outer sleeve, the second hook portion contacts and squeezes the inner wall of the first circumferential groove, while the inner wall of the second circumferential groove contacts and squeezes the first hook portion.

8. The rotating body mounting structure according to claim 1, characterized in that, At the end away from the fastening sleeve, the end of the outer sleeve is provided with a limiting flange protruding from the second conical surface.

9. The rotating body mounting structure according to claim 1, characterized in that, Several gap grooves are arranged on the first conical surface of the inner sleeve, penetrating the inner and outer structures; the gap grooves extend along the axial direction of the inner sleeve.

10. A chainsaw, characterized in that, Includes the rotating body mounting structure as described in any one of claims 1-9, which is used to mount the sprocket to the drive shaft of the motor.

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