Chain saw

Abstract

The utility model provides a chain saw. The chain saw comprises a first shell, a second shell, a power system, a cutter assembly and a brake system. The second shell is installed on the first shell and provided with an opening. And a driving part of the power system penetrates through the opening and extends out of the second shell. And a brake disc of the brake system is mounted on the driving part. A first stop structure is arranged in a gap between the brake disc and the second shell. According to the chain saw, the first stopping structure is arranged in the gap between the brake disc and the second shell, when the chain saw works, the first stopping structure effectively stops dust such as tiny wood chips or dust in the gap between the brake disc and the second shell, and therefore a brake system or other functional parts in the shell are protected against interference and damage of the dust, and the service life of the chain saw is prolonged. The stability and reliability of a brake system or other functional parts are ensured, and the risk that equipment is disturbed by dust and chips and breaks down is reduced.

Description

Technical Field

[0001] This utility model relates to the field of garden tool design technology, specifically to a chainsaw. Background Technology

[0002] A chainsaw is a cutting tool used to cut wood or other hard materials. It consists of one or more sharp chains wound around a guide rail, driven by a motor to rotate at high speed for cutting. Chainsaws are widely used in logging, gardening, construction, and other applications requiring the cutting of hard materials.

[0003] Most chainsaws on the market are equipped with a braking system. The brake disc and brake band, as important components of the braking system, are usually installed inside the chainsaw housing. Because chainsaws typically generate a large amount of dust, such as fine wood chips or other powders, during cutting operations, this dust can enter the housing through the gap between the housing and the brake disc. This can easily lead to brake system malfunction or cause other components inside the housing to fail, affecting the normal operation of the equipment and creating safety hazards. Utility Model Content

[0004] In view of the problems existing in the prior art, the present invention provides a chainsaw to improve the technical problem that dust generated during the operation of the current chainsaw enters the housing through the gap between the brake disc and the housing, affecting the normal operation of the equipment.

[0005] To achieve the above and other related objectives, this utility model provides a chainsaw, comprising a first housing, a second housing, a power system, a cutter assembly, and a braking system. The second housing is mounted on the first housing and has an opening. The power system includes a drive unit that extends through the opening to the outside of the second housing. The cutter assembly is connected to the drive unit to perform cutting operations under the rotational drive of the drive unit. The braking system includes a brake disc mounted on the drive unit. A first stop structure is provided within the gap between the brake disc and the second housing.

[0006] In one embodiment of the chainsaw of this utility model, the first stop structure includes a first boss and a first groove. The first boss is disposed on one of the second housing and the brake disc. The first groove is disposed on the other of the second housing and the brake disc, and the first boss is inserted into the first groove.

[0007] In one embodiment of the chainsaw of this utility model, multiple sets of first stop structures are spaced apart between the brake disc and the second housing along the radial direction of the brake disc.

[0008] In one embodiment of the chainsaw of this utility model, the brake disc includes a stepped portion extending from the opening to the outside of the second housing.

[0009] In one embodiment of the chainsaw of this utility model, the first housing and the second housing are detachably locked together, and there is an installation gap between the first housing and the second housing. A second stop structure is also provided in the installation gap.

[0010] In one embodiment of the chainsaw of this utility model, the second stop structure includes a second boss and a second groove, the second boss being disposed on the second housing. The second groove is disposed on the first housing, and the second boss is inserted into the second groove.

[0011] In one embodiment of the chainsaw of this utility model, the first housing has a receiving cavity, the brake disc is located in the receiving cavity, and the second stop structure is disposed between the receiving cavity and the installation gap.

[0012] In one embodiment of the chainsaw of this utility model, multiple sets of the second stop structures are spaced apart within the installation gap along the radial direction of the brake disc.

[0013] In one embodiment of the chainsaw of this utility model, the first housing and the second housing are detachably fixedly connected, and a stop structure is provided at the circumferential joint surface of the first housing and the second housing.

[0014] In one embodiment of the chainsaw of this utility model, the stop structure includes a flange and an annular groove, the flange being disposed on the outer edge of the second housing. The annular groove is disposed on the first housing, and the flange is inserted into the annular groove.

[0015] In one embodiment of the chainsaw of this utility model, the stop structure further includes a clamping block, which is disposed in the annular groove and is pressed against both sides of the flange by the first housing.

[0016] In one embodiment of the chainsaw of this utility model, the diameter of the opening is smaller than the outer diameter of the sprocket.

[0017] This invention provides a chainsaw that incorporates a first stop structure within the gap between the brake disc and the second housing. During operation, this first stop structure effectively traps fine wood chips or dust within the gap, preventing them from further spreading to other areas within the housing. This protects the braking system or other functional components within the housing from interference and damage caused by dust, ensuring the stability and reliability of the braking system or other components, and reducing the risk of equipment malfunction due to dust intrusion. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a partial cross-sectional view of one embodiment of the chainsaw of this utility model;

[0020] Figure 2 for Figure 1 A magnified structural diagram of region A;

[0021] Figure 3 for Figure 1 A magnified structural diagram of region B;

[0022] Figure 4 This is a top view of the brake disc installation state in one embodiment of the chainsaw of this utility model;

[0023] Figure 5 This is a schematic diagram of the assembly state of the first housing and the second housing in one embodiment of the chainsaw of this utility model;

[0024] Figure 6 for Figure 5 A magnified structural diagram of region C;

[0025] Figure 7 for Figure 5 A schematic diagram of the AA-direction section structure in region C;

[0026] Figure 8 This is a schematic diagram of the overall structure of one embodiment of the chainsaw of this utility model.

[0027] Component designation explanation

[0028] 100. Housing; 110. First housing; 120. Second housing; 121. Opening; 130. Receiving cavity; 200. Braking system; 210. Brake disc; 211. Main body; 212. Connecting part; 2121. Stepped part; 220. Brake band; 300. Tool assembly; 310. Sprocket; 400. First stop structure; 410. First boss; 420. First groove; 500. Second stop structure; 510. Second boss; 520. Second groove; 600. Stop structure; 610. Flanged edge; 620. Annular groove; 630. Clamping block; 700. Power system; 710. Drive unit. Detailed Implementation

[0029] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0030] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, equipment, and materials similar to or equivalent to those in the embodiments of this invention.

[0031] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0032] To address the technical problem that dust generated during the operation of current chainsaws can enter the housing through the gap between the brake disc and the housing, affecting the normal operation of the equipment, this utility model provides a chainsaw that can protect the braking system or other functional components inside the housing from interference and damage by dust, ensuring the stability and reliability of the braking system or other functional components, and reducing the risk of equipment failure caused by dust intrusion.

[0033] Please see Figure 1 and Figure 8This utility model provides a chainsaw, which includes a housing 100, a braking system 200, a drive unit 710, and a first stop structure 400. The housing 100 includes a first housing 110 and a second housing 120, with the second housing 120 fixedly connected to the first housing 110. The method of fixed connection between the first housing 110 and the second housing 120 is not limited, such as snap-fit ​​connection, bolt connection, riveting, etc., but is not limited thereto. An opening 121 is provided on the second housing 120, connecting the inside of the housing 100 to the outside of the housing 100. The power system 700 is installed inside the housing 100 and has a drive unit 710 extending through the opening 121 to the outside of the second housing 120. The drive unit 710 is the transmission structure between the power unit of the chainsaw and the cutter assembly 300, i.e., an output shaft or a drive shaft. The power unit of the chainsaw can be a motor or an engine, but is not limited thereto. The output end of the power unit is connected to one end of the drive unit 710, and the power unit drives the drive unit 710 to rotate. The other end of the drive unit 710 extends through the opening 121 to the outside of the second housing 120.

[0034] The cutter assembly 300, as the cutting unit of the chainsaw, is the main source of sawdust and other dust. The cutter assembly 300 is connected to the drive unit 710. Specifically, one end of the drive unit 710, extending through the opening 121 and outside the second housing 120, is connected to the cutter assembly 300, so that the cutter assembly 300 is driven by the rotation of the drive unit 710 to perform cutting operations. The braking system 200 includes a brake disc 210 and a brake band 220. The brake disc 210 is coaxially mounted on the drive unit 710 and located within the housing 100. The brake band 220 is disposed on the outer periphery of the brake disc 210. When the braking function of the braking system 200 needs to be activated, the brake band 220 grips the outer periphery of the brake disc 210, limiting the rotational speed of the brake disc 210, thereby achieving the chainsaw's deceleration braking function.

[0035] In this design, the brake disc 210 is a rotating component, while the second housing 120 is a stationary component. A gap exists between the brake disc 210 and the second housing 120, and a first stop structure 400 is installed within this gap. The structure of the first stop structure 400 is not limited; for example, it can be a pad structure, a constricted opening structure, a labyrinth seal structure, a slotted block structure, etc. The key is to prevent dust and debris entering through the opening 121 from further spreading into other areas within the housing 100. This protects the brake system 200 or other functional components within the housing 100 from interference and damage caused by dust and debris, ensuring the stability and reliability of the brake system 200 or other functional components, and reducing the risk of equipment malfunction due to dust intrusion.

[0036] Please see Figure 1and Figure 2 In one embodiment of the chainsaw of this utility model, the cutter assembly 300 includes a sprocket 310, which is mounted on a brake disc 210 and coaxially mounted on a drive unit 710 via the brake disc 210. The brake disc 210 includes a main body 211 and a connecting part 212 extending from an opening 121 to the outside of the second housing 120. The main body 211 is located inside the housing 100, and the radial dimension of the main body 211 is larger than the radial dimension of the opening 121. A first stop structure 400 is disposed in the gap between the second housing 120 and the main body 211 to stop dust and debris at the gap, thereby preventing fine wood chips or dust from further spreading to other areas inside the housing 100. The sprocket 310 is coaxially mounted on the drive unit 710 of the chainsaw via the connecting part 212. That is, when the braking system 200 is working, the braking system 200 directly acts on the sprocket 310 to achieve a good braking and deceleration effect. However, in other embodiments, the sprocket 310 can also be directly coaxially mounted to the drive unit 710. That is, when the braking system 200 is working, the braking system 300 acts on the drive unit 710, and indirectly acts on the sprocket 310 through the drive unit 710, thereby achieving a braking and deceleration effect on the cutter assembly 300. It should be noted that the braking system 200 may also include conventional structural components such as tension springs that enable the braking system 200 to brake the cutter assembly of the chainsaw, which will not be described in detail here. The cutter assembly 300 may also include conventional structural components of existing chainsaw cutter assemblies such as chains and guide plates, which will not be described in detail here.

[0037] Please see Figure 1 and Figure 2In one embodiment of the chainsaw of this utility model, the first stop structure 400 includes a first boss 410 and a first groove 420. The first boss 410 is disposed on one of the second housing 120 and the brake disc 210. The first groove 420 is disposed on the other of the second housing 120 and the brake disc 210. Specifically, if the first boss 410 is fixed to the second housing 120, then the corresponding first groove 420 is formed on the brake disc 210. Conversely, if the first boss 410 is fixed to the brake disc 210, then the first groove 420 is formed on the second housing 120, and the first boss 410 is inserted into the first groove 420 to form a labyrinth-sealed stop structure, preventing dust and debris from penetrating. Specifically, in this embodiment, the first groove 420 is formed on the surface of the main body 211 facing the second housing 120. The first groove 420 is an annular groove with a U-shaped cross-section. A first boss 410 is provided on the surface of the second housing 120 at a position corresponding to the first groove 420. The first boss 410 and the second housing 120 are integrally formed. The first boss 410 extends from the surface of the second housing 120 toward the main body 211, and is inserted into the first groove 420 with a clearance fit. This design does not affect the wear of the first boss 410 during the rotation of the brake disc 210, and simultaneously forms a labyrinth seal dustproof structure to prevent dust from seeping in through the gap between the brake disc 210 and the second housing 120. Furthermore, the integral structure of the first boss 410 and the second housing 120 allows the first boss 410 to act as a reinforcing rib to increase the structural strength of the second housing 120.

[0038] In one embodiment of this chainsaw, to achieve a multi-layered labyrinth seal and prevent dust from affecting the normal operation of the braking system 200, multiple sets of first stop structures 400 are spaced apart between the brake disc 210 and the second housing 120 along the radial direction of the brake disc 210. The design of multiple first stop structures 400 further reduces the probability of dust spreading through the gaps between the brake disc 210 and the second housing 120 to other areas within the housing 100. This avoids impacting the braking system 200, thereby reducing brake malfunctions caused by dust accumulation, improving the reliability and service life of the braking system 200, and ultimately enhancing the overall performance and safety of the chainsaw.

[0039] Please see Figure 1 and Figure 3In one embodiment of the chainsaw of this utility model, the brake disc 210 further includes a stepped portion 2121. Along the axial direction of the drive portion 710, the stepped portion 2121 extends from the opening 121 to the outside of the second housing 120. Furthermore, along the radial direction of the drive portion 710, the stepped portion 2121 and the second housing 120 are in clearance fit. Specifically, in this embodiment, the stepped portion 2121 is coaxially disposed on the outside of the connecting portion 212. The stepped portion 2121 and the connecting portion 212 can be an integral structure or a separate structure. The outer periphery of the stepped portion 2121 is in clearance fit with the second housing 120 at the opening 121. The stepped portion 2121 further reduces the gap between the second housing 120 at the opening 121 and the connecting portion 212, reducing the probability of dust falling into the gap between the second housing 120 and the brake disc 210. Meanwhile, along the axial direction of the brake disc 210, the stepped portion 2121 protrudes from the outer surface of the second housing 120, which can prevent dust from accumulating on the surface of the stepped portion 2121 and further reduce the probability of dust falling into the housing 100 through the gap at the opening 121.

[0040] Please see Figures 1 to 3 In one embodiment of the chainsaw of this utility model, the first housing 110 and the second housing 120 are detachably and fixedly connected. Specifically, in this embodiment, the second housing 120 is detachably locked to the first housing 110 by bolts. The first housing 110 is provided with a receiving cavity 130, and the second housing 120 covers the receiving cavity 130. The brake disc 210 and brake band 220 of the braking system 200 are installed in the receiving cavity 130. The second housing 120 prevents the braking system 200 from being directly exposed to the external environment, thereby reducing the equipment failure rate. Because the first housing 110 and the second housing 120 are bolted together, there is an installation gap between them. Dust and debris may enter the receiving cavity 130 from outside the housing 100 through the installation gap. Therefore, a second stop structure 500 is provided within the installation gap between the first housing 110 and the second housing 120. The position and number of the second stop structure 500 are not limited, as long as it can extend the path of dust and debris from outside the housing 100 through the installation gap into the receiving cavity 130 and reduce the probability of dust and debris entering the receiving cavity 130. For example, the second stop structure 500 can be provided between the overlapping area of ​​the first housing 110 and the second housing 120, i.e., within the installation gap, or it can be provided between the installation gap and the receiving cavity 130.

[0041] Please see Figure 2In one embodiment of the chainsaw of this utility model, the second stop structure 500 includes a second boss 510 and a second groove 520. The second boss 510 is disposed on one of the first housing 110 and the second housing 120, and the second groove 520 is disposed on the other opposite to the second boss 510. Specifically, in one embodiment, the second boss 510 is disposed on the first housing 110, and the second groove 520 is correspondingly disposed on the second housing 120. In another embodiment, the second boss 510 may be disposed on the second housing 120, and the second groove 520 is correspondingly disposed on the first housing 110. Specifically, in this embodiment, in order to reduce the installation gap between the first housing 110 and the second housing 120, the second boss 510 is disposed on the second housing 120. Along the axial direction of the drive part 710, the second boss 510 extends from the surface of the second housing 120 toward the first housing 110. A second groove 520 is formed on the first housing 110 at the position corresponding to the second boss 510. The second boss 510 is inserted into the second groove 520 to form a dustproof structure in the form of a labyrinth seal, so as to prevent dust and debris from entering the receiving cavity 130.

[0042] Please see Figure 2 In one embodiment of the chainsaw of this utility model, the first housing 110 has a receiving cavity 130, the second housing 120 covers the receiving cavity 130, the brake disc 210 is installed in the receiving cavity 130, and the second stop structure 500 is located between the receiving cavity 130 and the installation gap. Specifically, in this embodiment, the second stop structure 500 stops the communication between the installation gap between the first housing 110 and the second housing 120 and the receiving cavity 130, stopping dust and debris within the installation gap and preventing dust and debris from entering the receiving cavity 130 through the installation gap. A second groove 520 is formed on the first housing 110. The cross-sectional shape of the second groove 520 is L-shaped. Along the axial direction of the drive part 710, a second boss 510 is provided on the second housing 120 at the corresponding position of the second groove 520. The second boss 510 and the second housing 120 are integral structures, and the second boss 510 extends into the receiving cavity 130. The second stop structure 500, located at the edge of the cavity 130, serves as the final barrier structure for the installation gap between the first housing 110 and the second housing 120, preventing dust and debris from entering the cavity 130. Simultaneously, the cooperation between the second boss 510 and the second groove 520 facilitates the assembly and positioning of the first housing 110 and the second housing 120.

[0043] Please see Figure 4Because multiple cavities exist on the first housing 110 at the overlapping surface of the first housing 110 and the second housing 120, the sealing and dustproofing effect of the second stop structure 500 is affected. In one embodiment of the chainsaw of this utility model, the number of second stop structures 500 can be multiple sets along the radial direction of the brake disc 210, and multiple sets of second stop structures 500 are spaced apart in the installation gap between the first housing 110 and the second housing 120. By using multiple sets of second stop structures 500 in cooperation between the overlapping surfaces of the first housing 110 and the second housing 120, the path of dust and debris entering the receiving cavity 130 from the installation gap is extended, so as to achieve circumferential dustproofing between the first housing 110 and the second housing 120 and reduce the probability of dust and debris penetrating into the receiving cavity 130.

[0044] Please see Figures 5 to 7 In one embodiment of the chainsaw of this utility model, in order to prevent sawdust or other debris from seeping into the receiving cavity 130 through the gap between the mounting surfaces of the first housing 110 and the second housing 120, causing the braking system 200 in the receiving cavity 130 to fail, a stop structure 600 is also provided at the circumferential joint surface between the outer edge of the second housing 120 and the first housing 110. The stop structure 600 can be a single stop structure or a multi-stop structure.

[0045] Specifically, please refer to Figure 6 and Figure 7 In this embodiment, the stop structure 600 is a single stop structure. The stop structure 600 includes a flange 610 and an annular groove 620. The flange 610 is integral with the second housing 120. The flange 610 is circumferentially arranged along the outer edge of the second housing 120 and extends circumferentially from the outer edge of the second housing 120 toward the first housing 110, forming a flange structure that extends axially along the driving part 710 and is perpendicular to the second housing 120. An annular groove, i.e., an annular groove 620, is formed on the first housing 110 at the corresponding embedding position of the flange 610. The cross-section of the annular groove 620 is U-shaped. The end of the flange 610 is inserted into the annular groove 620, and the flange 610 and the annular groove 620 form an insertion structure. The circumferential insertion structure of the flange 610 and the annular groove 620 can form a labyrinth-sealed dustproof structure after the first housing 110 and the second housing 120 are locked and fixed, blocking the straight penetration path of dust and debris. Furthermore, compared to the second stop structure 500 set in the installation gap between the first housing 110 and the second housing 120, the stop structure 600 is located at the circumferential joint surface of the first housing 110 and the second housing 120. This not only achieves a circumferential dustproof sealing effect, but also reduces the assembly difficulty of the first housing 110 and the second housing 120 during assembly.

[0046] Furthermore, to ensure the clamping effect of the flange 610 on the first housing 110 at the annular groove 620 and improve the dustproof sealing performance, please refer to... Figure 7 In one embodiment of the chainsaw of this utility model, the stop structure 600 further includes a clamping block 630, which is disposed within the annular groove 620. The clamping block 630 and the first housing 110 are respectively clamped to both sides of the flange 610. Specifically, in this embodiment, the housing sidewall facing the receiving cavity 130 of the annular groove 620 is designated as the first sidewall, and the housing sidewall facing away from the receiving cavity 130 of the annular groove 620 is designated as the second sidewall. The first sidewall abuts against the inner sidewall of the flange 610, and the clamping block 630 is located within the annular groove 620 and clamps the second sidewall, thereby clamping the flange 610 and the first housing 110 together and reducing the probability of dust and debris seeping in. The number of clamping blocks 630 and their position within the annular groove 620 are not limited, as long as they can achieve a tight fit between the flange 610 and the first housing 110 and reduce the probability of dust and debris seeping in through the installation gap between the first housing 110 and the second housing 120.

[0047] In one embodiment of the chainsaw of this utility model, the diameter of the opening 121 is smaller than the outer diameter of the sprocket 310. Specifically, in this embodiment, the diameter of the opening 121 is smaller than the outer diameter of the main body 211. Along the radial direction of the drive part 710, the fitting gap between the second housing 120 and the drive part 710 is reduced, that is, the gap at the opening 121 is compressed, reducing the probability that dust and debris will fall from the gap at the opening 121 into the gap between the second housing 120 and the brake disc 210.

[0048] It should be noted that the chainsaw of this utility model may also include conventional systems and structural components of existing chainsaws, such as power devices, electrical systems, heat dissipation systems, and control systems. These conventional systems and structural components can be designed according to existing technical solutions, so they will not be described in detail here, nor will they be limited.

[0049] This invention provides a chainsaw that incorporates a first stop structure within the gap between the brake disc and the second housing. During operation, this first stop structure effectively traps fine wood chips or dust within the gap, preventing them from further spreading into other areas of the housing. This protects the braking system and other functional components within the housing from interference and damage caused by dust, ensuring the stability and reliability of these components and reducing the risk of malfunctions due to dust intrusion. It addresses the technical problem of dust generated during chainsaw operation entering the housing through the gap between the brake disc and the housing, thus affecting normal operation. Therefore, this invention effectively overcomes some practical problems in the prior art and has high utilization value and practical significance.

[0050] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A chainsaw, characterized in that, include: First shell; The second housing is installed on the first housing and has an opening; The power system includes a drive unit that extends through the opening to the outside of the second housing; A cutting tool assembly is connected to the drive unit to perform a cutting operation under the rotational drive of the drive unit; A braking system, the braking system including a brake disc, the brake disc being mounted on the drive unit; A first stop structure is provided in the gap between the brake disc and the second housing.

2. The chainsaw according to claim 1, characterized in that, The first stop structure includes a first boss and a first groove. The first boss is disposed on one of the second housing and the brake disc; the first groove is disposed on the other of the second housing and the brake disc, and the first boss is inserted into the first groove.

3. The chainsaw according to claim 2, characterized in that, Along the radial direction of the brake disc, multiple sets of the first stop structures are spaced apart between the brake disc and the second housing.

4. The chainsaw according to claim 1, characterized in that, The brake disc includes a stepped portion that extends from the opening to the outside of the second housing.

5. The chainsaw according to claim 1, characterized in that, The first housing and the second housing are detachably fixedly connected, and there is an installation gap between the first housing and the second housing. A second stop structure is also provided in the installation gap.

6. The chainsaw according to claim 5, characterized in that, The second stop structure includes a second boss and a second groove. The second boss is disposed on the second housing; the second groove is disposed on the first housing, and the second boss is inserted into the second groove.

7. The chainsaw according to claim 5, characterized in that, The first housing has a receiving cavity, the brake disc is located in the receiving cavity, and the second stop structure is disposed between the receiving cavity and the mounting gap.

8. The chainsaw according to claim 5 or 6, characterized in that, Along the radial direction of the brake disc, multiple sets of the second stop structures are spaced apart within the mounting gap.

9. The chainsaw according to claim 1, characterized in that, The first housing and the second housing are detachably fixedly connected, and a stop structure is provided at the circumferential joint surface of the first housing and the second housing.

10. The chainsaw according to claim 9, characterized in that, The stop structure includes a flange and an annular groove. The flange is disposed on the outer edge of the second housing. The annular groove is disposed on the first housing, and the flange is inserted into the annular groove.

11. The chainsaw according to claim 10, characterized in that, The stop structure also includes a clamping block, which is disposed in the annular groove and is pressed against both sides of the flange by the first housing.

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