A chain saw

Abstract

The present invention provides a chainsaw, specifically relating to the field of cutting tools. The chainsaw comprises a housing, a guide plate, a saw chain, a tool guard, and a bolt. A guide block and a first connecting hole are provided on one side of the housing. The guide plate is provided with a retaining groove that cooperates with the guide block. The saw chain is mounted on the guide plate and driven by a drive device disposed within the housing. The tool guard is provided with a second connecting hole corresponding to the first connecting hole. The bolt is rotatably retained on the tool guard and axially movable along the second connecting hole. When the guide plate is installed, the bolt passes through the guide plate and is threadedly connected to the first connecting hole to secure the guide plate between the tool guard and the housing. The chainsaw of the present invention is simple to assemble, and because the bolt remains attached to the tool guard, it can be prevented from being lost during assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting tools, and in particular to a chain saw. Background Art

[0002] A chainsaw is a tool commonly used to cut wood, concrete, or stone. It relies on the movement of the cutting teeth on a chain to generate cutting force. To drive the chain, a sprocket is typically provided. The sprocket's teeth mesh with the chain's links, and the sprocket is driven by a drive motor, which in turn drives the chain.

[0003] Currently, chainsaws on the market typically use a universal bolt and nut system to attach the cutter to the housing. This design offers advantages such as universal parts and low cost. However, the commonality of the fastening components in this connection leads to large dimensional tolerances and low tool positioning accuracy, resulting in a short service life. Furthermore, this system presents difficulties in on-site assembly: the guide plate and tool guard must be simultaneously clamped in place before the nut is screwed onto the fastening bolts. This process poses a risk of the nut falling off and being lost. Especially in systems with two or more fastening bolts, the weight of the guide plate, which has not yet been secured, can cause the threaded connection to twist. Therefore, developing a new tool mounting fastening system is crucial. Summary of the Invention

[0004] In view of the above shortcomings of the prior art, the present invention provides a chain saw to improve the problem that fasteners are easily lost during the tool assembly process.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a chain saw, which includes a housing, a guide plate, a saw chain, a tool guard cover and a bolt. A guide block and a first connecting hole are provided on one side of the housing, and a limiting groove cooperating with the guide block is provided on the guide plate. The saw chain is mounted on the guide plate and driven by a driving device provided in the housing; a second connecting hole corresponding to the first connecting hole is provided on the tool guard cover; the bolt is rotatable and axially movable along the second connecting hole and is retained on the tool guard cover. The bolt passes through the guide plate and can be threadedly connected to the first connecting hole to fasten the guide plate between the tool guard cover and the housing.

[0006] In one example of the present invention, a compression bushing with interference fit is provided in the second connecting hole, and a first matching hole and a second matching hole with successively increasing apertures are provided in the compression bushing.

[0007] In one example of the present invention, the bolt includes a stop portion, a rod-shaped portion and a threaded portion. The stop portion stops on the outside of the first matching hole, one end of the rod-shaped portion is connected to the stop portion, and the other end extends into the second matching hole and is connected to the threaded portion.

[0008] In one example of the present invention, an internal thread matching the threaded portion is provided in the first connecting hole.

[0009] In one example of the present invention, a clamping ring is provided on the rod-shaped portion, and the outer diameter of the clamping ring is larger than that of the first matching hole and smaller than that of the second matching hole.

[0010] In one example of the present invention, a clamping ring groove is provided on the rod-shaped portion, and the clamping ring is clamped in the clamping ring groove.

[0011] In an example of the present invention, the distance from the collar to the connection point between the first matching hole and the second matching hole is greater than or equal to the depth of the threaded portion screwed into the first connection hole.

[0012] In one example of the present invention, a flange extending radially outward is provided at one end of the compression bushing facing the first connecting hole, and a groove matching the flange is provided at one end of the second connecting hole facing the first connecting hole.

[0013] In one example of the present invention, the chain saw also includes a tensioning adjustment device installed on the housing, the tensioning adjustment device includes a driving gear, a driven gear meshing with the driving gear, a threaded rod installed on the driven gear, and a pin threadedly connected to the threaded rod, one end of the pin is connected to the guide plate, and the rotation of the threaded rod drives the pin to slide along the threaded rod, thereby driving the guide plate connected to the pin to move along the guide block.

[0014] In one example of the present invention, a tightening hole cooperating with the pin is provided on the guide plate, and one end of the pin is inserted into the tightening hole to drive the guide plate to move.

[0015] In one example of the present invention, the driving gear is provided with an adjusting shaft fixedly connected thereto, the tool guard is provided with an adjusting hole for the adjusting shaft to pass through, and the adjusting shaft passes through a limiting groove and is installed in the adjusting hole.

[0016] In an example of the present invention, the tension adjustment device further includes a tension housing, the tension housing is clamped on the outer shell, and the driving gear, the driven gear and the threaded rod are installed on the tension housing.

[0017] In one example of the present invention, a through hole is provided on the tensioning shell for the adjusting shaft to pass through, a first support wall and a second support wall are arranged opposite to each other on the tensioning shell, a driven gear accommodating groove is formed between the first support wall and the second support wall, and a first installation groove for installing the threaded rod is symmetrically arranged on the first support wall and the second support wall.

[0018] In an example of the present invention, the guide block is detachably connected to the housing, and a mounting hole matching the guide block is provided on the housing.

[0019] In an example of the present invention, column structures extending toward the interior of the housing are provided on both sides of the guide block, and the first connection hole is provided on the column structures.

[0020] The chain saw of the present invention holds the bolt on the tool guard so that it can rotate and move axially along the connecting hole. When replacing the tool, it is only necessary to loosen the bolt and remove the tool guard from the housing. Since the bolt is always kept on the tool guard, the bolt can be prevented from being lost. When assembling the tool, the guide block is first used to cooperate with the limit groove on the guide plate to perform preliminary positioning and limit the movement of the guide plate in the vertical direction. Since the contact area between the guide block and the guide plate is large, the bearing capacity of the tool can also be improved, thereby improving its service life to a certain extent. The guide plate can slide along the guide block to achieve the purpose of adjusting the tightness of the saw chain. A compression bushing with a stepped hole is provided on the tool guard cover, and the stepped hole cooperates with the clamping ring to restrict the bolt in the compression bushing, so that it moves along the axial direction of the hole and always remains in the hole to prevent the bolt from being lost. The bolt is rotated to move along the axial direction of the connecting hole to fasten the tool between the tool guard cover and the housing; the distance from the clamping ring to the connection between the first matching hole and the second matching hole is set to be greater than the limit depth of the threaded portion screwed into the first connecting hole to ensure that the bolt tightens the tool guard cover and the chain saw housing; a radially outward flange is provided at the bottom of the compression bushing, and the cooperation of the flange and the groove can prevent the bushing from falling off from the connecting hole of the tool guard cover; a tension adjustment device is provided on the housing, and the tension adjustment device can be used to drive the guide plate to move along the guide block to adjust the tightness of the saw chain. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 is a schematic structural diagram of a chain saw according to an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the structure of a chain saw according to one embodiment of the present invention with the tool guard removed;

[0024] Figure 3 for Figure 2 Enlarged schematic diagram of the middle I area;

[0025] Figure 4 This is a schematic structural diagram of a chain saw according to one embodiment of the present invention with the blade and blade guard removed;

[0026] Figure 5 for Figure 4 Enlarged schematic diagram of the middle II area;

[0027] Figure 6 is a schematic cross-sectional view of a chain saw according to an embodiment of the present invention;

[0028] Figure 7 for Figure 6 Enlarged schematic diagram of the middle III area;

[0029] Figure 8 Schematic diagram of the structure of a guide plate of a chain saw in one embodiment of the present invention;

[0030] Figure 9 A schematic structural diagram of a tool guard of a chain saw according to an embodiment of the present invention;

[0031] Figure 10 for Figure 9 A partial cross-sectional schematic diagram;

[0032] Figure 11 A schematic structural diagram of a compression bushing in an embodiment of a chain saw according to the present invention;

[0033] Figure 12 for Figure 11 A cross-sectional schematic diagram;

[0034] Figure 13 A schematic diagram of the structure of a bolt in an embodiment of a chain saw of the present invention;

[0035] Figure 14 Schematic diagram of the assembly structure of a compression bushing and a bolt in an embodiment of a chain saw of the present invention;

[0036] Figure 15 is a schematic structural diagram of a tension adjustment device of a chain saw in one embodiment of the present invention;

[0037] Figure 16 A schematic structural diagram of a tension adjustment device of a chain saw according to an embodiment of the present invention from another angle;

[0038] Figure 17 FIG. 1 is a schematic structural diagram of a tensioning housing of a chain saw according to an embodiment of the present invention.

[0039] Component number description

[0040] 100, housing; 101, tool mounting seat; 1011, second mounting slot; 1012, threaded rod receiving slot; 102, guide block; 1021, column structure; 103, first connecting hole; 104, housing; 200, tool; 201, guide plate; 2011, limit slot; 2012, tensioning hole; 202, saw chain; 203, sprocket; 300, tool guard; 301, second connecting hole; 3011, groove; 302, pressing bushing; 3021, first matching hole; 3022, second matching hole; 3023, convex Edge; 303, adjustment hole; 400, bolt; 401, stop portion; 402, rod-shaped portion; 4021, clamping ring groove; 403, threaded portion; 404, clamping ring; 500, tensioning adjustment device; 501, driving gear; 502, driven gear; 503, threaded rod; 504, pin; 505, adjustment shaft; 506, tensioning housing; 5061, first supporting wall; 5062, second supporting wall; 5063, driven gear accommodating groove; 5064, first mounting groove; 5065, through hole; 5066, arcuate surface; 6, handle. DETAILED DESCRIPTION

[0041] The following describes the embodiments of the present invention by means of specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the features in the following embodiments and examples can be combined with each other unless they conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific embodiments, not to limit the scope of protection of the present invention.

[0042] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0043] See also Figures 1 to 17 , an object of the present invention is to provide a chain saw to solve the problem of fastener loss during tool installation.

[0044] See also Figures 1 to 3The present invention provides a chain saw, which includes a housing 100, a driving device (not shown) disposed within the housing 100, a cutter 200 mounted on the housing 100, and a cutter fastening structure for mounting the cutter. A guide block 102 and a first connecting hole 103 are provided on one side of the housing 100. The cutter 200 includes a guide plate 201 and a saw chain 202. The guide plate 201 is provided with a limiting groove 2011 that cooperates with the guide block 102. The saw chain 202 is mounted on the outer edge of the guide plate 201 and is driven by the driving device. The cutter fastening structure includes a cutter guard 300 and a bolt 400. The cutter guard 300 is provided with a second connecting hole 301 (see FIG. 1 ) that cooperates with the first connecting hole 103. Figure 9 ), the bolt 400 can be rotated and axially moved along the second connecting hole 301 and always remain on the tool guard cover 300. When the chain saw is installed with the tool 200, the bolt 400 passes through the guide plate 201 and is threadedly connected to the first connecting hole 103 to fasten the guide plate 201 between the tool guard cover 300 and the housing 100.

[0045] See also Figure 1 、 Figures 3 to 5 In one example, the location where the tool 200 is mounted on the housing 100 is designated as the tool mounting seat 101. A guide block 102 is disposed on the tool mounting seat 101, and a first connection hole 103 is disposed on one side of the guide block 102. One end of the guide plate 201 engages with the guide block 102 via a retaining groove 2011 for initial positioning. The guide plate 201 is secured to the first connection hole 103 via a bolt 400. The other end of the guide plate 201 extends outward beyond the housing 100. A saw chain 202 is mounted on the outer edge of the guide plate 201 and, driven by a drive device, can move circumferentially along the guide plate 201 to perform a cutting action. For example, a groove for mounting the saw chain 202 is disposed on the outer edge of the guide plate 201, and the cutting teeth of the saw chain 202 are inserted into the groove. A sprocket 203 driven by a drive mechanism is mounted on the housing 100. This sprocket 203 is located on one side of the tool mount 101. One end of a saw chain 202 is mounted on the sprocket 203. Driven by the sprocket 203, the other end of the saw chain 202 is guided around the outer edge of the guide plate 201. A handle 6 is located in the middle of the upper portion of the housing 100 and at one end facing away from the guide plate 201. These handles 6 allow the chainsaw to be operated or carried.

[0046] See also Figure 3 and Figure 8For example, the limiting groove 2011 on the guide plate 201 is larger along the length of the guide plate 201 than the guide block 102, while its width matches that of the guide block 102. In this case, the limiting groove 2011 is mounted on the guide block 102, providing a certain vertical limit. Under external force, the guide plate 201 can slide horizontally along the guide block 102 to adjust the tension of the saw chain 202. To replace the saw chain, simply loosen the bolt 400 and remove the tool guard 300. Since the bolt 400 remains attached to the tool guard 300, the problem of bolts being easily lost is resolved.

[0047] See also Figure 6 、 Figure 7 、 Figures 9 to 14 In one embodiment, a clamping bushing 302 is provided in the second connecting hole 301, and a first matching hole 3021 and a second matching hole 3022 with successively increasing apertures are provided in the clamping bushing 302. The first matching hole 3021 is provided at the outward end of the clamping bushing 302, and the second matching hole 3022 is provided at the inward end of the clamping bushing 302. The first matching hole 3021 and the second matching hole 3022 are connected to form a stepped hole. The bolt 400 includes a stop portion 401, a rod-shaped portion 402 and a threaded portion 403. The outer diameter of the stop portion 401 is larger than the aperture of the first matching hole 3021, and it stops on the outside of the first matching hole 3021. One end of the rod-shaped portion 402 is connected to the stop portion 401, and the other end extends into the second matching hole 3022 and is connected to the threaded portion 403. The outer diameter of the rod-shaped portion 402 is smaller than the aperture of the first matching hole 3021. To ensure that the bolt 400 always remains on the tool protection cover 300, a clamping ring 404 is provided on the rod-shaped portion 402. After the clamping ring 404 is installed on the rod-shaped portion 402, its outer diameter is larger than the aperture of the first matching hole 3021 and smaller than the aperture of the second matching hole 3022. The design of the clamping ring 404 can ensure that the bolt 400 can move freely along the axial direction of the second connecting hole 301, and can always keep the bolt 400 on the tool protection cover 300 to prevent the bolt 400 from being lost. Preferably, the clamping ring 404 is detachably mounted on the rod-shaped portion 402 to facilitate removal of the bolt 400. For example, the rod-shaped portion 402 is provided with a clamping ring groove 4021, into which the clamping ring 404 is clamped. The threaded portion 403 extends toward the first connecting hole 103. Accordingly, the first connecting hole 103 is provided with an internal thread that mates with the threaded portion 403. Preferably, the distance r between the clamping ring 404 and the junction between the first mating hole 3021 and the second mating hole 3022 is greater than or equal to the maximum depth s of the threaded portion 403 screwed into the internal thread, thereby ensuring a secure connection between the bolt 400 and the first connecting hole 103. Of course, in other embodiments, the compression bushing 302 may not be provided, and the first and second mating holes may be directly machined into the second connecting hole 301.

[0048] See also Figure 10 and Figure 11 In one example, the clamping sleeve 302 is press-fitted into the second connecting hole 301 with an interference fit. To prevent the clamping sleeve 302 from being pulled out of the second connecting hole 301 under the action of external force, the clamping sleeve 302 extends a flange 3023 outward along its radial direction toward one end of the first connecting hole 103. Accordingly, a groove 3011 that cooperates with the flange 3023 is provided at one end of the second connecting hole 301 toward the first connecting hole 103. The groove 3011 expands outward along the radial direction of the second connecting hole 301, and the flange 3023 of the clamping sleeve 302 is clamped in the groove 3011 of the second connecting hole 301.

[0049] See also Figure 1 、 Figure 3 、 Figure 5 、 Figures 15 to 17 In one embodiment, the tool mounting base 101 is further provided with a tension adjustment device 500, which is positioned between the guide plate 201 and the sprocket 203 to adjust the tension of the saw chain 202. The tension adjustment device 500 includes a driving gear 501, a driven gear 502, a threaded rod 503, and a pin 504. The driving gear 501 is provided with an adjustment shaft 505 fixedly connected thereto. The tool guard 300 is provided with an adjustment hole 303 for the adjustment shaft 505 to pass through. The adjustment shaft 505 passes through the retaining groove 2011 of the guide plate 201 and is installed in the adjustment hole 303. Rotating the adjustment shaft 505 drives the driving gear 501 to rotate. The driven gear 502 is meshed with the driving gear 501, with their axes perpendicular to each other. One end of the threaded rod 503 is fixedly mounted on the driven gear 502, and the other end extends toward one side of the guide plate 201. A pin 504 is provided with a threaded hole extending radially therethrough. The pin 504 is threadedly connected to the threaded rod 503 through the threaded hole, and one end of the pin 504 is connected to the guide plate 201. For example, a tightening hole 2012 is provided on the guide plate 201 to match the pin 504, and one end of the pin 504 is correspondingly inserted into the tightening hole 2012. By using an external force to rotate the adjustment shaft 505, the driving gear 501 can be driven to rotate. The driving gear 501 drives the driven gear 502 to rotate, and then drives the threaded rod 503 to rotate. Since the pin 504 is threadedly connected to the threaded rod 503, as the threaded rod 503 rotates, the pin 504 slides on the threaded rod 503, thereby driving the guide plate 201 to move left and right along the guide block 102, so as to achieve the purpose of adjusting the tightness of the saw chain 202.

[0050] See also Figure 5 、 Figures 15 to 17In one example, the tension adjustment device 500 further includes a tension housing 506, which is mounted on the tool mounting base 101. The driving gear 501, the driven gear 502, and the threaded rod 503 are mounted within the tension housing 506. The tension housing 506 defines a through-hole 5065 through which the adjustment shaft 505 passes. A first support wall 5061 and a second support wall 5062 are disposed opposite each other at the bottom thereof. A driven gear receiving groove 5063 is formed between the first support wall 5061 and the second support wall 5062. First mounting grooves 5064 for mounting the threaded rod 503 are correspondingly disposed on the first support wall 5061 and the second support wall 5062. During installation, the driven gear 502 is rotatably installed in the driven gear accommodating groove 5063 between the first support wall 5061 and the second support wall 5062. One end of the threaded rod 503 passes through the first installation groove 5064 and is installed on the driven gear 502. After the driving gear 501 is engaged with the driven gear 502, it is located above the first support wall 5061 and the second support wall 5062. The adjusting shaft 505 passes through the through hole 5065 and is installed in the adjusting hole 303. In order to prevent the driving gear 501 from rubbing against the first support wall 5061 and the second support wall 5062 when rotating, the upper ends of the first support wall 5061 and the second support wall 5062 are provided with an arc surface 5066 that matches the shape of the driving gear 501.

[0051] See also Figure 5 In one embodiment, the tool mount 101 is provided with a second mounting groove 1011 for mounting the tension housing 506 and a threaded rod receiving groove 1012. The tension housing 506 is mounted within the second mounting groove 1011, with the side of the tension housing 506 that mounts the driving gear 501, the driven gear 502, and the threaded rod 503 facing the interior of the tool mount 101. The end of the threaded rod 503 facing away from the driven gear 502 extends into the threaded rod receiving groove 1012 and is rotatably connected to the sidewall of the receiving groove. Preferably, the tool mount 101 is also provided with a cover 104, with corresponding through holes formed in the cover 104 at positions corresponding to the guide block 102, the first connecting hole 103, the threaded rod receiving groove 1012, and the adjustment shaft 505.

[0052] See also Figure 1 、 Figure 5 、 Figure 9 and Figure 15In the present invention, the bolt 400, the first connection hole 103, and the second connection hole 301 form a locking structure. At least one locking structure is required when installing a tool. In one embodiment, the chain saw utilizes two locking structures when installing a tool. Specifically, the tool guard 300 is provided with two second connection holes 301, each of which is provided with a bolt 400 that is axially movable along the second connection hole 301. The two bolts 400 are retained within the two second connection holes 301. Accordingly, the tool mounting base 101 is provided with two first connection holes 103, each of which mates with the second connection holes 301. In this embodiment, the internal structures of the first connection hole 103 and the second connection hole 301 are identical to those described above and are not further described here.

[0053] See also Figure 1 、 Figure 5 、 Figure 9 and Figure 15 Preferably, each side of the guide block 102 is provided with a column structure 1021 extending into the interior of the housing 100 and integral with the guide block 102. Two first connection holes 103 are respectively disposed within the column structures 1021 on either side of the guide block 102. The tool mounting base 101 is provided with a mounting hole for the guide block 102 and through holes respectively communicating with the first connection holes 103. The guide block 102 is secured to the tool mounting base 101 via the mounting holes. The bolts 400 pass through the through holes and are threadedly connected to the first connection holes 103, thereby securing the guide plate 201 between the tool mounting base 101 and the tool guard 300. Of course, in other embodiments, the guide block 102 and the first connection holes 103 may also be directly integrally formed with the tool mounting base 101.

[0054] Other structures of the chain saw not described in detail in the present invention can be realized by conventional structures in the art and will not be described in detail here. The tool fastening structure of the present invention can also be used in other tools.

[0055] The chainsaw of the present invention secures the guide plate between the tool guard and the housing via a bolt that remains permanently attached to the tool guard. To replace a tool, simply loosen the bolt and remove the tool guard from the chainsaw housing. Since the bolt remains permanently attached to the tool guard, it prevents loss of the bolt. The guide block and the retaining groove cooperate to provide preliminary positioning for the guide plate of the saw chain. The large contact area between the guide block and the guide plate increases the load-bearing capacity of the tool, significantly extending its lifespan. Therefore, the present invention effectively overcomes several practical problems of the prior art and thus offers high utility value and practical significance.

[0056] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A chain saw, characterized in that: include: The housing has a guide block and a first connecting hole on one side; A guide plate, provided with a limiting groove that cooperates with the guide block; a saw chain mounted on the guide bar and driven by a drive device disposed in the housing; a tool protection cover, on which a second connection hole corresponding to the first connection hole is provided; and a bolt, rotatably and axially movable along the second connecting hole, held on the tool guard, the bolt passing through the guide plate and being threadedly connected to the first connecting hole to fasten the guide plate between the tool guard and the housing; The dimension of the limiting groove along the length direction of the guide plate is larger than the dimension of the guide block, and the dimension along the width direction of the guide plate matches the dimension of the guide block; A clamping bushing with an interference fit is provided in the second connecting hole, and a first matching hole and a second matching hole with successively increasing apertures are provided in the clamping bushing; the bolt includes a stopper portion, a rod-shaped portion and a threaded portion, and a clamping ring is provided on the rod-shaped portion, and the outer diameter of the clamping ring is larger than the first matching hole and smaller than the second matching hole.

2. The chain saw according to claim 1, wherein: The stopping portion stops at the outside of the first matching hole, one end of the rod-shaped portion is connected to the stopping portion, and the other end extends into the second matching hole and is connected to the threaded portion.

3. The chain saw according to claim 2, wherein: An internal thread matching the threaded portion is provided in the first connecting hole.

4. The chain saw according to claim 1, wherein: The rod-shaped portion is provided with a clamping ring groove, and the clamping ring is clamped in the clamping ring groove.

5. The chain saw according to claim 1, wherein: The distance from the clamping ring to the connection point between the first matching hole and the second matching hole is greater than or equal to the depth of the threaded portion screwed into the first connecting hole.

6. The chain saw according to claim 1, wherein: The end of the compression bushing facing the first connecting hole is provided with a flange extending radially outward, and the end of the second connecting hole facing the first connecting hole is provided with a groove matching the flange.

7. The chain saw according to claim 1, wherein: The guide block is detachably connected to the shell, and the shell is provided with a mounting hole matching the guide block.

8. The chain saw according to claim 7, wherein: Column structures extending toward the interior of the housing are provided on both sides of the guide block, and the first connecting hole is provided on the column structures.

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