Chain saw

Abstract

The utility model provides a chain saw. The chain saw comprises a machine shell, a power system, a cutter assembly and an air blowing device. The power system is installed in the machine shell and provided with a driving part penetrating through the machine shell to extend out, and a fit clearance is formed between the driving part and the machine shell. The cutter assembly is connected with the driving part so as to conduct cutting operation under rotation driving of the driving part. The air blowing device is installed on the machine shell and enables air flow to be exhausted out of the machine shell from the interior of the machine shell through the fit clearance. In the chain saw structure, the air flow generated by the air blowing device is exhausted out of the machine shell from the inside of the machine shell through the fit clearance, positive pressure air exhaust from the inside of the machine shell to the outside of the machine shell is achieved, and therefore dust is prevented from invading the inside of the machine shell through the fit clearance from the outside of the machine shell. Meanwhile, a brake system or other functional parts in the machine shell are protected against interference and damage of dust, and the stability and reliability of the brake system or other functional parts are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of garden tool design, specifically relates to a chain saw. BACKGROUND

[0002] Chain saw is a cutting tool for cutting wood or other hard materials, it is surrounded by one or more sharp chains on a guide rail, the chain is driven by a motor, makes it high speed rotation to cut. Chain saw is widely used in logging, gardening, building and other occasions that need to cut hard materials.

[0003] Chain saw generally includes tool assembly, brake system and power system and other conventional components, tool assembly is located outside the shell of chain saw, power system connects brake system and tool assembly. Because tool assembly usually produces a lot of dust, such as fine sawdust or other dust, when cutting work, it is easy to invade the inside of the machine shell, resulting in brake system failure or other installation components failure in the machine shell, affecting the normal work of the equipment. SUMMARY

[0004] In view of the problems existing in the prior art, the utility model provides a chain saw to improve the technical problem that dust produced in the working process of the current chain saw invades the inside of the machine shell and causes equipment failure.

[0005] To achieve the above object and other related objects, the utility model provides a chain saw, the chain saw includes a machine shell, a power system, a tool assembly and a blowing device. The power system is installed inside the machine shell and has a driving part extending through the machine shell, and the driving part has a matching gap with the machine shell. The tool assembly is connected with the driving part to perform cutting operation under the rotary drive of the driving part. The blowing device is installed on the machine shell and makes the airflow pass through the matching gap from the inside of the machine shell to the outside of the machine shell.

[0006] In an embodiment of the chain saw of the utility model, the chain saw further includes a wind deflector, the wind deflector is connected with the blowing device to guide the airflow from the inside of the machine shell to the matching gap.

[0007] In an embodiment of the chain saw of the utility model, the power system includes a motor, the motor includes a heat dissipation blade, and the blowing device is the heat dissipation blade of the motor.

[0008] In an embodiment of the chain saw of the utility model, the chain saw includes a wind deflector, the wind deflector is installed inside the machine shell and covers the circumferential side of the heat dissipation blade to guide the airflow to the matching gap.

[0009] In the chain saw embodiment of the utility model, the air deflector cover comprises a cover body and an air duct, the cover body is wrapped around the peripheral side of the heat dissipation blade, the air inlet of the air duct is communicated with the cover body, and the air outlet of the air duct is communicated with the matching gap.

[0010] In the chain saw embodiment of the utility model, the cover body has a worm flow channel arranged around the outer periphery of the heat dissipation blade, an air outlet is formed on the casing, the air outlet is communicated with the worm flow channel and the outside of the casing, and the air inlet end of the air duct extends at least partially into the worm flow channel.

[0011] In the chain saw embodiment of the utility model, the chain saw comprises a brake disc, the casing comprises a first casing body and a second casing body, and the second casing body is provided with a first accommodating cavity; the brake disc is installed in the first accommodating cavity, the first casing body covers the open end of the first accommodating cavity, the first accommodating cavity is communicated with the matching gap, and the airflow is introduced into the first accommodating cavity.

[0012] In the chain saw embodiment of the utility model, the chain saw further comprises an air inlet, the air inlet is arranged on the casing and located on the side away from the cutter assembly, and the air inlet is communicated with the inside of the casing.

[0013] In the chain saw embodiment of the utility model, the first casing body and the second casing body are detachably fixedly connected, and a stop opening structure is further arranged at the circumferential joint surface of the first casing body and the second casing body.

[0014] In the chain saw embodiment of the utility model, the stop opening structure comprises a flange and a ring groove, the flange is arranged on the outer edge of the first casing body, and the ring groove is arranged on the second casing body, and the flange is inserted into the ring groove.

[0015] In the chain saw embodiment of the utility model, the stop opening structure further comprises a pressing block, the pressing block is arranged in the ring groove, and the pressing block and the second casing body are respectively pressed on the two sides of the flange.

[0016] The utility model provides a chain saw, in the chain saw structure, install the air blower in the casing, the airflow generated by the air blower is discharged from the casing to the outside of the casing through the matching gap, realize the positive pressure exhaust from the inside of the casing to the outside of the casing, so as to stop the dust from invading the inside of the casing through the matching gap from the outside of the casing. The structural design of the positive pressure exhaust from the inside of the casing to the outside of the casing keeps the inside of the casing clean, protects the brake system or other functional components in the casing from the interference and damage of dust, ensures the stability and reliability of the brake system or other functional components, and reduces the risk of equipment failure caused by dust interference. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other embodiments can also be obtained from these drawings without creative labor.

[0018] Figure 1 Structure diagram of the chain saw in an embodiment of the present application Figure 1 ;

[0019] Figure 2 Structure diagram of the chain saw in an embodiment of the present application Figure 2 ;

[0020] Figure 3 Front view of the structure distribution in the second accommodating cavity in an embodiment of the chain saw of the present application

[0021] Figure 4 D-D sectional view of the structure of Figure 3 ;

[0022] Figure 5 Structure diagram of the structure distribution in the first accommodating cavity in an embodiment of the chain saw of the present application

[0023] Figure 6 A region of Figure 5 ;

[0024] Figure 7 Structure diagram of the stop structure and the installation position in an embodiment of the chain saw of the present application

[0025] Figure 8 B region of Figure 7 ;

[0026] Figure 9 C region of Figure 7 ;

[0027] Figure 10 Structure diagram of the machine shell part in an embodiment of the chain saw of the present application

[0028] Figure 11 D region of Figure 10 ;

[0029] Figure 12 D region A-A sectional view of the structure of Figure 10 ;

[0030] Figure 13 Structure diagram of the air guide cover in an embodiment of the chain saw of the present application Figure 1;

[0031] Figure 14 For the chain saw embodiment of the utility model wind scooping structure schematic Figure 2 .

[0032] Element number explanation:

[0033] 100, shell; 101, first accommodating cavity; 102, second accommodating cavity; 1021, air inlet; 103, volute flow channel; 1031, air outlet; 110, first shell; 111, opening; 120, second shell; 130, third shell; 200, brake system; 210, brake disc; 211, main body part; 212, connecting part; 220, brake belt; 300, power system; 310, motor; 320, blowing device; 330, driving part; 400, wind scooping; 410, cover body; 420, air duct; 430, flow dividing plate; 500, cutter assembly; 510, sprocket; 600, stop structure; 610, boss; 620, groove; 700, stop opening structure; 710, flange; 720, ring groove; 730, pressing block. DETAILED DESCRIPTION

[0034] The embodiments of the utility model will be described below through specific examples. Those skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification. The utility model can also be implemented or applied through different specific embodiments, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the utility model are used to describe specific specific embodiments, but not to limit the protection scope of the utility model. The test method is not specified in the following embodiments. Generally, it is carried out according to the conventional conditions or the conditions recommended by the manufacturer.

[0035] When the embodiment gives a numerical range, it should be understood that, unless otherwise stated by the utility model, each numerical range and any numerical value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the utility model are used by the skilled person in the art and the description of the utility model, and any method, equipment and material of the prior art similar or equivalent to the method, equipment and material in the embodiment of the utility model can be used to realize the utility model.

[0036] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" in the specification are only for the convenience of clear description, and are not used to limit the scope of the utility model, and the change or adjustment of the relative relationship is also considered as the scope of the utility model without substantial change of the technical content.

[0037] In order to improve the technical problem that the dust generated in the current chain saw operation invades the shell and affects the normal work of the equipment, the utility model provides a chain saw which can protect the brake system or other functional components in the shell from the interference and damage of dust, ensure the stability and reliability of the brake system or other functional components, and reduce the risk of failure of the chain saw caused by dust interference.

[0038] Please refer to Figures 1 to 14 The utility model provides a chain saw, chain saw includes shell 100, power system 300, cutter assembly 500 and blowing device 320. Shell 100 is the shell structure of chain saw, is equipped with containing cavity. Shell 100 provides the housing of installation and protection for multiple structural components of chain saw. Power system 300 is installed in the inside of shell 100, and has the drive part 330 that stretches out through shell 100, and drive part 330 is the transmission structure between the power device of chain saw and cutter assembly 500, namely output shaft or transmission shaft. The power device of chain saw can be motor, can also be engine, but is not limited to this. The output end of power device is connected to one end of drive part 330, and the other end of drive part 330 is connected to cutter assembly 500. Power device drives drive part 330 to rotate, and then drives cutter assembly 500 to carry out cutting operation.

[0039] Cutter assembly 500 as the cutting unit of chain saw is the main source of dust such as wood chips or other dust, and drive part 330 and shell 100 have a cooperation gap. When cutter assembly 500 carries out cutting operation, dust is easy to invade shell 100 from the cooperation gap between drive part 330 and shell 100. In order to prevent dust from invading shell 100 from the cooperation gap, the chain saw further comprises blowing device 320, blowing device 320 is installed in shell 100, blowing device 320 as airflow generating device drives airflow to flow out of shell 100 from the cooperation gap. Blowing device 320 can be integratedly installed in shell 100, or can be arranged outside shell 100, as long as airflow can flow out of shell 100 from the cooperation gap to achieve the purpose of stopping dust from invading.

[0040] In the chain saw structure, the airflow generated by the air blowing device 320 is discharged from the casing 100 to the outside of the casing 100 through the matching gap, realizing positive pressure exhaust from the inside of the casing 100 to the outside of the casing 100, thereby preventing dust from invading the inside of the casing 100 through the matching gap from the outside of the casing 100. The structure design of the positive pressure exhaust from the inside of the casing 100 to the outside of the casing 100 keeps the inside of the casing 100 clean, protects the brake system 200 or other functional components in the casing 100 from interference and damage of dust, ensures the stability and reliability of the brake system 200 or other functional components, and reduces the risk of failure of the chain saw due to dust interference.

[0041] Referring to Figure 13 and 14 In an embodiment of the chain saw of the utility model, the chain saw further comprises a wind deflector 400, the air blowing device 320 is installed in the casing 100, and the wind deflector 400 is connected to the air blowing device 320. Specifically, the wind deflector 400 is connected to the air outlet end of the air blowing device 320 to accurately guide the airflow generated by the air blowing device 320 from the inside of the casing 100 to the matching gap, and then discharge to the outside of the casing 100. The wind deflector 400 further improves the dust blocking effect at the matching gap by accurately guiding the airflow to the matching gap.

[0042] Referring to Figure 4 In an embodiment of the chain saw of the utility model, the power system 300 comprises a motor 310 and a driving part 330, the motor 310 is a power device for chain saw work, and the motor 310 is installed in the casing 100. The output end of the motor 310 is connected to the driving part 330, the motor 310 drives the driving part 330 to rotate, and then drives the cutter assembly 500 to perform cutting operation. The motor 310 is a heating component, and needs to be cooled to prevent the temperature of the motor 310 and the accommodating cavity where the motor 310 is located from being too high, which affects the normal work of the power system 300 or other components of the chain saw. The motor 310 comprises heat dissipation blades, which not only serve as heat dissipation components of the motor 310 to dissipate heat of the motor 310, but also serve as the air blowing device 320 to realize the discharge of the airflow from the inside of the casing 100 to the outside of the casing 100 through the matching gap. The heat dissipation blades are connected to the rotor of the motor 310, and when the motor 310 drives the driving part 330 to rotate, the heat dissipation blades are also rotated. Designing the heat dissipation blades of the motor 310 as the air blowing device 320 realizes the dual functions of heat dissipation and dust prevention, simplifies the overall structure of the chain saw, does not need to additionally increase a new air blowing structure, improves energy efficiency, and enhances the adaptability and application range of the equipment.

[0043] Referring to Figure 4In the chain saw embodiment of the utility model, the air guide cover 400 is installed inside the casing 100 and covers the peripheral side of the heat dissipation blade to accurately guide the airflow into the cooperation gap and then discharge it outside the casing 100 to prevent dust in the cooperation gap from invading. The air guide cover 400 can optimize the airflow path and improve the heat dissipation efficiency of the heat dissipation blade on the motor 310. Meanwhile, the air guide cover 400 also covers the peripheral side of the motor 310, and the air guide cover 400 is arranged outside the motor 310 to reduce the heat generated by the motor 310 from spreading to other accommodation cavity spaces inside the casing 100 and reduce the temperature influence on other electrical components inside the casing 100. Meanwhile, the cover body 410 covers the peripheral side of the motor 310 to further improve the airflow circulation of the heat dissipation blade and improve the heat dissipation efficiency on the motor 310.

[0044] Please refer to Figure 4 、 Figure 13 and Figure 14 In the chain saw embodiment of the utility model, the air guide cover 400 includes a cover body 410 and an air guide pipe 420, the cover body 410 covers the peripheral side of the heat dissipation blade, the air inlet of the air guide pipe 420 is communicated with the cover body 410, and the air outlet of the air guide pipe 420 is communicated with the cooperation gap. Specifically, in this embodiment, the casing 100 includes a first shell 110, a second shell 120 and a third shell 130, the first shell 110 is detachably fixedly connected with the second shell 120, the second shell 120 has a first accommodation cavity 101, and the first shell 110 and the second shell 120 cooperatively cover the first accommodation cavity 101. The second shell 120 is detachably fixedly connected with the third shell 130, and the second shell 120 and the third shell 130 enclose a second accommodation cavity 102. The air guide cover 400 and the motor 310 are installed in the second accommodation cavity 102, the driving part 330 extends out of the casing 100 through the first accommodation cavity 101 and the first shell 110, and the cooperation gap is communicated with the first accommodation cavity 101 and the outside of the casing 100. The cover body 410 covers the outside of the heat dissipation blade and the motor 310, the air inlet of the air guide pipe 420 is communicated with the cover body 410, the air outlet of the air guide pipe 420 is communicated with the first accommodation cavity 101, thereby guiding the airflow to the cooperation gap to realize the positive pressure exhaust of the first accommodation cavity 101 through the cooperation gap to the outside of the casing 100 and prevent dust from invading the first accommodation cavity 101. Meanwhile, the casing 100 is designed to form a plurality of relatively independent accommodation cavities to realize the physical space separation of different structural modules installed in the casing 100 and effectively limit the dust diffusion path inside the casing 100.

[0045] Please refer to Figure 3 and Figure 4In the chain saw embodiment of the utility model, the cover body 410 has a volute flow channel 103 arranged around the outer periphery of the heat dissipation blade, and the casing 100 is provided with an air outlet 1031, which is communicated with the volute flow channel 103 and the outside of the casing 100. The air inlet end of the air duct 420 extends at least partially into the volute flow channel 103. Specifically, in this embodiment, the air duct 420 is located in the second accommodating cavity 102, the air inlet end of the air duct 420 is communicated with the volute flow channel 103, and the air outlet end of the air duct 420 is communicated with the first accommodating cavity 101 through the wall of the second casing 120. The air scoop 400 restrains the centrifugal airflow generated by the heat dissipation blade in the volute flow channel 103 and discharges the airflow outside the casing 100 through the air outlet 1031. On the basis of the original airflow dissipation and circulation of the motor 310, the air duct 420 partially divides the airflow circulating in the volute flow channel 103 and then blows into the first accommodating cavity 101, forming a positive pressure exhaust of the first accommodating cavity 101 to the outside of the casing 100, thereby achieving the purpose of preventing dust from invading the first accommodating cavity 101. Meanwhile, the air outlet 1031 is located at the end of the volute flow channel 103 and is arranged on the lower part of the third casing 130, thereby eliminating the influence of the blown airflow on the operator.

[0046] Please refer to Figure 5 and Figure 6 In the chain saw embodiment of the utility model, the air scoop 400 further comprises a flow dividing plate 430, which is installed at the air outlet end of the air duct 420. The flow dividing plate 430 and the air duct 420 are in an integrated structure, the flow dividing plate 430 is in a cross-shaped structure and is located at the air outlet of the air duct 420, thereby enhancing the structural strength of the air outlet of the air duct 420. Meanwhile, the airflow circulating in the air duct 420 is dispersed into multiple strands, thereby improving the diffusion effect of the airflow in the first accommodating cavity 101.

[0047] Please refer to Figure 2 In the chain saw embodiment of the utility model, the air inlet 1021 is located on the side wall of the casing 100 away from the direction of the cutter assembly 500. The air inlet 1021, which is communicated with the atmosphere and the second accommodating cavity 102, is arranged on the side away from the dust generation, thereby reducing the dust suction into the second accommodating cavity 102. Meanwhile, a dustproof grille or a dustproof screen and the like structure is arranged on the casing 100 at the air inlet 1021, thereby further reducing the probability of dust in the atmosphere around the chain saw being sucked into the second accommodating cavity 102 while ensuring the airflow suction into the second accommodating cavity 102.

[0048] Please refer to Figure 1 , Figure 7 and Figure 8In the chain saw embodiment of the utility model, the casing 100 comprises a first casing 110 and a second casing 120. The first casing 110 is provided with an opening 111, and the driving part 330 extends to the outside of the casing 100 through the first accommodating cavity 101 and the opening 111. The second casing 120 is detachably fixedly connected with the first casing 110. In this embodiment, the second casing 120 is bolted with the first casing 110. The second casing 120 is provided with the first accommodating cavity 101, and the opening end of the first accommodating cavity 101 is covered by the first casing 110. The opening end of the first accommodating cavity 101 is an opening facing the first casing 110. The first accommodating cavity 101 is in communication with the matching gap. The airflow is introduced into the first accommodating cavity 101 by the air blowing device 320, and then discharged to the outside of the casing 100 through the matching gap, thereby reducing the influence of dust invasion on the brake system 200. The chain saw comprises the brake system 200, and the brake system 200 comprises a brake disc 210 and a brake belt 220. The brake disc 210 is coaxially installed on the driving part 330 and located in the first accommodating cavity 101. When the brake function of the brake system 200 needs to be performed, the brake belt 220 tightly holds the outer periphery of the brake disc 210, thereby limiting the rotation speed of the brake disc 210 and realizing the speed reduction brake function.

[0049] Please refer to Figure 8 and Figure 10 The brake disc 210 comprises a main body part 211 and a connecting part 212 extending to the outside of the first accommodating cavity 101 from the opening 111. The main body part 211 is located in the first accommodating cavity 101, and the connecting part 212 extends to the outside of the casing 100 from the opening 111. The connecting part 212 can reduce the matching gap at the opening 111 and reduce the probability of dust invasion into the first accommodating cavity 101. At the same time, along the axial direction of the driving part 330, the extension design of the connecting part 212 can avoid dust accumulation at the opening 111, thereby further reducing the probability of dust falling into the first accommodating cavity 101 from the matching gap at the opening 111. The cutter assembly 500 comprises a chain wheel 510. In this embodiment, the chain wheel 510 is coaxially installed on the driving part 330 through the connecting part 212, and the driving part 330 drives the chain wheel. However, in other embodiments, the chain wheel 510 can be directly coaxially installed on the driving part 330. It should be noted that the cutter assembly 500 can also comprise a chain, a guide plate and other conventional structural components of the cutter assembly of the existing chain saw, which will not be described here.

[0050] Please refer to Figure 9In the chain saw embodiment of the utility model, the brake disc 210 is gap fitted with the first shell 110, the brake disc 210 and the first shell 110 have an installation gap therebetween, and the installation gap is communicated with the fitting gap. In order to further prevent dust from entering the installation gap from the fitting gap and then diffusing to the whole first accommodating cavity 101, a stop structure 600 is arranged in the installation gap. Specifically, in this embodiment, the stop structure 600 is arranged between the main body part 211 and the first shell 110. The structure type of the stop structure 600 is not limited and can be any suitable structure type that meets the requirement of preventing dust from invading and diffusing to the whole first accommodating cavity 101 along the installation gap. For example, the stop structure 600 can be a pad structure, a necked structure, a labyrinth seal structure, a clamping groove and clamping block structure, etc. The stop structure 600 prevents dust from invading the brake band 220 around the outer periphery of the brake disc 210 and causing brake failure. Specifically, in this embodiment, when the chain saw is working, the dust is stopped in the cavity region surrounded by the surface of the brake disc 210 facing the first shell 110, the stop structure 600 and the first shell 110 at the opening 111, thereby preventing fine sawdust or dust from further diffusing to other regions of the first accommodating cavity 101. Meanwhile, the airflow introduced by the air duct 420 is communicated into the first accommodating cavity 101 and then flows through the installation gap at the stop structure 600 to the fitting gap at the opening 111. The dust is prevented from diffusing in a large area in the first accommodating cavity 101 by the stop of the stop structure 600, and the positive pressure exhaust of the first accommodating cavity 101 to the outer shell 100, thereby realizing the effect of double dust stopping and preventing dust from accumulating in the first accommodating cavity 101.

[0051] See Figure 7 and Figure 9In the chain saw embodiment of the utility model, the stop structure 600 includes a boss 610 and a groove 620, the boss 610 is arranged on one of the first shell 110 and the brake disc 210; the groove 620 is arranged on the other one of the first shell 110 and the brake disc 210, the boss 610 is inserted into the groove 620, and the boss 610 and the groove 620 are gap matched. Specifically, the boss 610 can be fixed on the second shell 120, and the corresponding groove 620 is formed on the brake disc 210. Conversely, the boss 610 is fixed on the brake disc 210, and the groove 620 is formed on the second shell 120. The boss 610 and the groove 620 are matched, the bottom of the boss 610 is inserted into the groove 620, a labyrinth seal structure is formed, and dust penetration is stopped. Specifically, in this embodiment, a groove 620 is formed on the surface of the main body part 211 facing the first shell 110, the groove 620 is an annular groove, and the cross section of the groove 620 is U-shaped. The boss 610 is arranged on the surface of the first shell 110 at the corresponding position of the groove 620. The boss 610 and the first shell 110 are an integral structure. The boss 610 extends from the surface of the first shell 110 to the main body part 211, the boss 610 is inserted into the groove 620, and the boss 610 and the groove 620 are gap matched. It does not affect the wear of the boss 610 during the rotation of the brake disc 210, and at the same time, a dustproof structure in the form of a labyrinth seal is formed to prevent dust from penetrating between the brake disc 210 and the second shell 120. At the same time, the gap matching of the boss 610 and the groove 620 can realize the circulation of airflow in the first containing cavity 101 to the outside of the machine shell 100. The stop structure 600 can be multiple groups, further stopping dust from invading and spreading to other areas of the first containing cavity 101, and ensuring the brake function of the brake system 200.

[0052] Please refer to Figure 10 and Figure 11 In the chain saw embodiment of the utility model, in order to prevent dust such as wood chips or dust from penetrating into the first containing cavity 101 through the gap between the first shell 110 and the second shell 120, causing the brake function of the brake system 200 in the first containing cavity 101 to fail, the machine shell 100 includes the first shell 110 and the second shell 120, the second shell 120 is connected to the first shell 110, and the second shell 120 and the first shell 110 enclose the first containing cavity 101. A stop structure 700 is also arranged at the circumferential joint surface of the first shell 110 and the second shell 120. The stop structure 700 can be a single stop structure or a multiple stop structure. In this embodiment, the stop structure 700 is a single stop structure.

[0053] Specifically, please refer to Figure 11 and Figure 12The stop structure 700 comprises a flange 710 and a ring groove 720, the flange 710 is an integral structure with the first shell 110, the flange 710 is arranged along the outer edge of the first shell 110 in a circumferential direction, the flange 710 extends in the circumferential direction from the outer edge of the first shell 110 to the direction of the second shell 120, forming a flange structure extending in the axial direction of the driving part 330 and perpendicular to the first shell 110. A ring-shaped groove, i.e. the ring groove 720, is arranged on the first shell 110 corresponding to the embedded position of the flange 710, the cross section of the ring groove 720 is U-shaped. The end of the flange 710 is inserted into the ring groove 720, and the flange 710 and the ring groove 720 form a plug-in structure. The circumferential plug-in structure of the flange 710 and the ring groove 720 can form a labyrinth dustproof structure after the locking and fixing of the first shell 110 and the second shell 120, which can block the straight penetration path of dust.

[0054] Please refer to Figure 12 In order to ensure the pressing effect of the flange 710 on the second shell 120 at the ring groove 720 and improve the dustproof performance, in an embodiment of the chain saw of the utility model, the stop structure 700 further comprises a pressing block 730, the pressing block 730 is arranged in the ring groove 720, and the pressing block 730 is pressed on the two sides of the flange 710 respectively. Specifically, in this embodiment, the shell side wall facing the side of the ring groove 720 facing the brake disc 210 is referred to as the first side wall, and the shell side wall facing the side of the ring groove 720 away from the brake disc 210 is referred to as the second side wall. The first side wall abuts against the inner side wall of the flange 710, the pressing block 730 is located in the ring groove 720 and presses the second side wall, so that the flange 710 and the second shell 120 are pressed tightly, and the probability of dust penetration is reduced. The number of the pressing block 730 and the position of the pressing block 730 arranged in the ring groove 720 are not limited, as long as the pressing block 730 can realize the pressing and fitting between the flange 710 and the second shell 120 and reduce the probability of dust penetration through the installation gap between the first shell 110 and the second shell 120. While reducing the dust invasion, the airflow in the first accommodating cavity 101 is further improved to flow to the opening 111, and the dustproof effect of the gap is improved.

[0055] It should be noted that the chain saw of the utility model can further comprise a connection structure for controlling the operation of the brake system 200, an electrical element for ensuring the normal operation of the chain saw, a battery, a brake belt 220 of the brake system 200, a mounting connecting piece (for example, a shaft sleeve and a bearing) and other conventional system and conventional structure components of the existing chain saw. The conventional system and the conventional structure components can be designed according to the existing technical solutions, and therefore, the details are not described here and are not limited.

[0056] The utility model provides a chain saw, in the chain saw structure, install the air blower in the casing, the air current that the air blower produces is from the casing inside through cooperation gap and is discharged to the casing outside, realize the positive pressure exhaust from the casing inside to the casing outside, thereby stop the dust from the casing outside through cooperation gap and invade the casing inside. The structural design of the positive pressure exhaust from the casing inside to the casing outside keeps the casing inside clean, protects the brake system or other functional components in the casing from the interference or damage of dust, ensures the stability and reliability of the brake system or other functional components, reduces the risk of equipment failure caused by dust interference. To improve the technical problem that the dust generated in the current chain saw working process invades the casing inside and affects the normal work of equipment. Therefore, the utility model effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.

[0057] The above embodiments only exemplarily illustrate the principles and effects of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A chainsaw, characterized in that, include: chassis; The power system is installed inside the housing and has a drive unit that extends through the housing, and there is a fitting clearance between the drive unit and the 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 blower is installed in the housing and causes airflow to exit the housing from inside the housing through the fitting gap.

2. The chainsaw according to claim 1, characterized in that, The chainsaw also includes an air guide shroud connected to the air blowing device to guide the airflow from inside the housing to the mating gap.

3. The chainsaw according to claim 1, characterized in that, The power system includes an electric motor, the electric motor includes heat dissipation blades, and the blower is the heat dissipation blades of the electric motor.

4. The chainsaw according to claim 3, characterized in that, The chainsaw includes an air guide shroud, which is installed inside the housing and covers the periphery of the heat dissipation blades to guide the airflow to the mating gap.

5. The chainsaw according to claim 4, characterized in that, The air guide shroud includes a shroud body and an air duct. The shroud body covers the periphery of the heat dissipation blades. The air inlet of the air duct is connected to the shroud body, and the air outlet of the air duct is connected to the mating gap.

6. The chainsaw according to claim 5, characterized in that, The cover has a spiral flow channel arranged around the outer periphery of the heat dissipation blades, and an air outlet is opened on the housing, which connects the spiral flow channel and the outside of the housing. The air inlet end of the air duct extends at least partially into the spiral flow channel.

7. The chainsaw according to claim 1, characterized in that, The chainsaw includes a brake disc, and the housing includes a first housing and a second housing. The second housing has a first receiving cavity. The brake disc is installed in the first receiving cavity. The first housing covers the opening end of the first receiving cavity. The first receiving cavity is in communication with the mating gap. The airflow is introduced into the first receiving cavity.

8. The chainsaw according to claim 1, characterized in that, The chainsaw also includes an air inlet, which is disposed on the housing and located on the side away from the tool assembly, and the air inlet communicates with the interior of the housing.

9. The chainsaw according to claim 7, 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 first housing. The annular groove is disposed on the second 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 clamped to both sides of the flange by the clamping block and the second housing respectively.

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