CHAINSAW

A chainsaw includes a housing, a cutter, a motor, a tensioning assembly and an air guiding cover. The housing is provided with at least one air inlet and one air outlet. The cutter mounted on the housing includes a saw chain and a guiding bar to support the saw chain. The motor is arranged in the housing and used to drive the cutter to work. The tensioning assembly is mounted on the housing and connected with the guiding bar to adjust a tightness of the saw chain. The air guiding cover is arranged in the housing, and the motor is arranged in the air guiding cover. The housing includes a mounting groove for mounting the tensioning assembly. Heat dissipation passages are arranged between the air inlet, air guiding cover, and the air outlet to dissipate hot airflow generated by the motor to an outside.

TECHNICAL FIELD

The disclosure belongs to a technical field of garden tools, and specifically relates to a chainsaw.

BACKGROUND

Chainsaw is a kind of handsaw powered by gasoline, electricity or hydraulics, which is usually used to cut wood, stone, steel, etc., which effectively saves time, manpower, etc. spent on cutting materials, thereby improving user's work efficiency. A chainsaw typically includes a saw blade assembly, a motor that drives the saw blade assembly to work, and a housing. The housing includes a main casing accommodating the motor and a motor cover covering a tail of the motor.

During a use of the chainsaw, there will be problems such as loose chain links, untimely heat dissipation, high motor temperature, and easy damage to the motor.

SUMMARY

The disclosure provides a chainsaw, that not only solves a problem of low connection stability between a tensioning device and a housing of the chainsaw, but also solves a problem of turbulence in airflow at an air outlet of the motor, thereby reducing air discharging efficiency of the motor. At the same time, it improves a problem that a heat dissipation structure of the chainsaw cannot be dustproof and waterproof at the same time during use.

The disclosure provides the chainsaw. The chainsaw includes a housing, a cutter, a motor, a tensioning assembly and an air guiding cover. The housing is provided with at least one air inlet and one air outlet. The cutter is mounted on the housing and includes a saw chain and a guiding bar to support the saw chain. The motor is arranged in the housing and used to drive the cutter to work. The tensioning assembly is mounted on the housing and connected with the guiding bar to adjust a tightness of the saw chain. The air guiding cover is arranged in the housing, and the motor is arranged in the air guiding cover. Wherein, the housing is provided with a mounting groove for mounting the tensioning assembly. Heat dissipation passages are arranged between the air inlet, the air guiding cover and the air outlet to dissipate hot airflow generated by the motor to an outside.

In an embodiment of the disclosure, an embedded hole is arranged in a side wall of the mounting groove, a first end of the tensioning assembly is fixedly connected with a bottom wall of the mounting groove, and a second end of the tensioning assembly stretches into the embedded hole and is rotatable in the embedded hole.

In an embodiment of the disclosure, a protective part is arranged at a bottom of the air inlet, and the protective part is provided with a strip-shaped protruding ribs located at an edge of the heat dissipation passage.

In an embodiment of the disclosure, the protective part includes a protective plate and a connecting plate, and the protective plate and the connecting plate are arranged at an angle.

In an embodiment of the disclosure, the connecting plate is arranged opposite to the heat dissipation passage, one end of the connecting plate away from the protective plate is fixedly connected with a top of the housing, an edge of the protective plate away from the connecting plate is provided with the protruding rib, and the protruding rib is arranged along an edge of the protective plate and is higher than the protective plate.

In an embodiment of the disclosure, the air guiding opening is arranged corresponding to a position and a size of the air outlet.

In an embodiment of the disclosure, an area of the air guiding opening is equal to an arca of the air outlet.

In an embodiment of the disclosure, the tensioning assembly includes a fixing part, an adjusting part and a transmitting component, the fixing part is fixedly connected with the bottom wall of the mounting groove through a pin, a plurality of grooves and through holes matched with the transmitting component are opened therein, the adjusting part is slidably connected with the fixing part through the transmitting component, the transmitting component is in a transmission connection with the adjusting part, and one end of the transmitting component extends into the embedded hole.

In an embodiment of the disclosure, the fixing part includes a first fixing part and a second fixing part that is vertically fixedly connected with the first fixing part, the transmitting component includes a driving helical gear rotatably connected with the first fixing part, a driven helical gear rotatably connected with the second fixing part, located below the driving helical gear, and meshed with the driving helical gear, and a transmission rod, a first end of the transmission rod is coaxially fixed with the driven helical gear, and is in a transmission connection with the adjusting part, and a second end of the transmission rod extends into the embedded hole.

In an embodiment of the disclosure, the mounting groove includes a first mounting groove and a second mounting groove, the first fixing part and the driving helical gear are arranged in the first mounting groove, the second fixing part, the adjusting part, the driven helical gear and the transmission rod are arranged in the second mounting groove, the second fixing part is fixedly connected with a bottom wall of the second mounting groove through a pin, and the embedded hole is opened in a side wall of the second mounting groove close to the saw chain.

In an embodiment of the disclosure, the air guiding cover includes a first cover and a second cover, the second cover is connected with the first cover, a cavity is arranged between the first cover and the second cover, an air guiding tube is further connected with one side of the first cover away from the second cover, the air guiding tube is connected with the motor, a bottom of the second cover is provided with the air guiding opening, and the air guiding opening is communicated with the cavity.

In an embodiment of the disclosure, the air guiding opening is arranged opposite to the air outlet, and the heat dissipation passages are formed between the air inlet, the cavity, the air guiding opening and the air outlet.

In an embodiment of the disclosure, a blower chamber is further formed between the first cover and the second cover, and a blower is arranged in the blower chamber.

In an embodiment of the disclosure, the housing includes a first casing, a second casing and an upper cover, the second casing is connected with the first casing and forms an empty cavity between the first casing, the motor is arranged in the empty cavity, and the upper cover is fixed on tops of the first casing and the second casing.

In an embodiment of the disclosure, a plurality of the air outlets is arranged at a bottom of the first casing and arranged lincarly.

Beneficial effects of the disclosure are that: the motor and the blower are arranged in the air guiding cover, which prevents the hot airflow around the motor from flowing inside the housing, at the same time, heat dissipation passages are formed between the air inlet, the cavity, the air guiding opening and the air outlet to speed up heat dissipation efficiency of the chainsaw, the air guiding opening is closely connected with the air outlet to strengthen an exchange of cold and hot airflow, furthermore, the area of the air guiding opening and the area of the air outlet are set in a same way to improve blowing efficiency and increase a heat dissipation effect accordingly.

In addition, the fixing part is fixed with the bottom wall of the mounting groove through the pin, so that a connection stability of the tensioning assembly on the housing may be increased. An end of the transmission rod away from the fixing part extends into the embedded hole of the mounting groove, so that a quick fixation of the tensioning assembly may be realized, and the connection stability between the tensioning assembly and the housing is improved.

The disclosure further arranges the protective part at the bottom of the air inlet, and the protruding ribs are formed at the edge of the protective plate, which can effectively block moisture and dust while ensuring the heat dissipation, and prevents the dust and moisture carried in the airflow from directly entering an inside of the housing from the air inlet and damaging the motor.

PART NUMBER DESCRIPTION

DETAILED DESCRIPTION

The following describes the implementation of the disclosure through specific embodiments, and those skilled in the art can easily understand other advantages and effects of the disclosure from the content disclosed in this specification. The disclosure may also be implemented or applied through other different specific embodiments. Various details in this specification may also be modified or changed based on different viewpoints and applications without departing from the disclosure. It should be noted that, the following embodiments and the features in the embodiments can be combined with each other without conflict.

It should be noted that drawings provided in the embodiments are only illustrative of a basic idea of the disclosure. The drawings only show assemblies related to the disclosure instead of drawing according to the number, shape and size of the assemblies in actual implementation. In actual implementation, the type, quantity and ratio of each assembly may be changed at will, and a layout of the assemblies may also be more complicated.

Please refer toFIG.1throughFIG.3. The disclosure provides a chainsaw. The chainsaw includes a housing1, a cutter2, a power assembly (not marked in the figure), a control assembly3, a tensioning assembly4and a heat dissipation mechanism. The cutter2is mounted on the housing1. The power assembly is housed in the housing1and is used to drive the cutter2to cut. The control assembly3is mounted on an end of the housing1away from the cutter2and is used to control the power assembly. The tensioning assembly4is arranged in the housing1and is in a transmission connection with a guiding bar22of the cutter2. In an embodiment, the guiding bar22is driven to move through an adjustment of the tensioning assembly4, so that a tension force of a saw chain21arranged on the guiding bar22circumferentially is adjusted. The heat dissipation mechanism is mounted on the power assembly in the housing1and is used to dissipate heat from the power assembly.

Please refer toFIG.2andFIG.3. In this embodiment, the housing1is roughly in a shape of a long box, and the housing1includes a first casing15, a second casing16and an upper cover13. The first casing15and the second casing16are similar in shape and structure, and the first casing15and the second casing16are enclosed together to form an empty cavity (not indicated in the figure), and the empty cavity is used for mounting parts of the chainsaw, such as a motor5, etc. An outer side wall of the second casing16is in a stepped shape, so that the cutter2may be mounted on an outer side of the casing1, and is convenient for mounting and disassembly. The upper cover13is fixed on an upper side of the first casing11and the second casing16, an opening131is further arranged on the upper cover13, and the opening131corresponds to a power supply socket14on the housing1, so that the battery pack is convenient to be inserted into the power supply socket14in the housing1.

In this embodiment, a first handle11is arranged at a rear end of the housing1, a second handle12is formed on a lower side of the housing1, and a length direction of the first handle11is roughly parallel to an extending direction of a chainsaw assembly. The first handle11is formed by being surrounded by ends of the first casing15and the second casing16, which means that the first handle11is integrally formed with the housing1, so that on one hand, a connection stability between the first handle11and the housing1is enhanced, and a user is convenient for holding the chainsaw to carry out a cutting operation. On the other hand, production steps and processes of the housing1are simplified, and production cost of the chainsaw is reduced.

In addition, the control assembly3is mounted at the first handle15, wherein the control assembly3includes a control board (not marked in the figure) and a switch trigger (not marked in the figure). The control board is arranged inside the housing1and is used for receiving an instruction transmitted by the switch trigger and controlling an on-off of the power assembly. The switch trigger is arranged at the first handle15and is electrically connected with the control board. A first end of the switch trigger penetrates in the housing1and is rotatably connected with an inner side wall of the housing1, and a second end of the switch trigger extends to an outside of housing1and may facilitate the user's finger to toggle the switch trigger. In another embodiment of the disclosure, the first handle11may further be separated from the housing1. It only needs to satisfy the connection stability between the first handle11and the housing1and ensure a feasibility of the user holding the chainsaw.

Please refer toFIG.1. In this embodiment, the cutter2includes the saw chain21and the guiding bar22for supporting the saw chain21. One end of the guiding bar22is arranged inside the housing1through a fastener, and another part of the guiding bar22extends forward along a length direction of the housing1. The saw chain21is arranged around a side wall of the guiding bar22, and the saw chain21is rotatably connected with the guiding bar22and may rotate at a high speed under a driving of the power assembly to perform cutting operation.

Please refer toFIG.2. In this embodiment, the power assembly includes a driving unit for driving the cutter2and a power supply unit for supplying power for the driving unit. It should be noted that, the driving unit is the motor5in this embodiment, and one end of an output shaft of the motor5passes through the second casing16and extends to an outside of the housing1, so that the cutter2and the motor5are convenient to be mounted or disassembled. In addition, in other embodiments of the disclosure, the driving unit may also be a power machine such as an enginc. The power supply unit includes the power supply socket14and a battery pack (not marked in the figure) that is detachably connected with the power supply socket14. Further, the power supply socket14is arranged between the second handle12and the first handle11, so that a center of gravity of the chainsaw may be located at a center position of the first handle11perpendicular to the housing1, and a width of two sides of the power supply socket14is within a range of twice a width of the housing1. This arrangement may effectively ensure a stability of the chainsaw when placed.

In an embodiment of the disclosure, there are two power supply sockets14symmetrically arranged, and they are located on two sides of a width direction of the housing1, so that the battery pack may be plugged and fixed on the outside of the housing1. This arrangement may facilitate a replacement and a charging of the battery pack, and further improve a practicality of the chainsaw.

Specifically, the power supply unit further includes a connector (not marked in the figure) arranged on the housing1for connecting the battery pack, and the power supply socket14is arranged correspondingly to the connector so that the battery pack is detachably connected with the housing1through the connector and is electrically connected with the power supply socket14. In this embodiment, the connector includes a power supply accommodating cavity and a guiding rail groove arranged in the power supply accommodating cavity, and the connector is symmetrically arranged on the two sides of the housing1. The power supply socket14is housed in the power supply accommodating cavity, and the battery pack is clamped and housed in the power supply accommodating cavity through the guiding rail groove, so that an electrical connection between the battery pack and the power supply socket14is stable, which effectively prevents a power supply abnormality of the chainsaw caused by a detachment between the battery pack and the power supply accommodating cavity.

Please refer toFIG.5,FIG.6andFIG.9. In a specific embodiment, at least one air inlet151and one air outlet152may be allowed to be arranged on the housing1of the chainsaw, and airflow may be allowed to enter an inside of the chainsaw through the air inlet151, and be discharged from the chainsaw through the air outlet152. Therefore, during a working process of the chainsaw, the airflow outside the chainsaw may be allowed to enter the inside of the chainsaw and take away heat generated by the chainsaw during the working process, so as to cool the chainsaw. It should be noted that, a protective part8is arranged at a bottom of the air inlet151, and the protective part8may be used to protect the inside of the housing1to avoid impurities and a small amount of liquid from entering the housing1through the air inlet151.

In an embodiment, the air inlet151and the air outlet152are located on the first casing15, and there are pluralities of groups of the air inlets151and the air outlets152respectively. Wherein, the plurality of groups of the air inlets151is arranged at a top of the first casing15and is linearly arranged, and the plurality of groups of the air outlets152is arranged at a bottom of the first casing15and are linearly arranged.

Please refer toFIG.3andFIG.4. In this embodiment, the housing1is further connected with an air guiding cover6, and the air guiding cover6is connected with the motor5. The air guiding cover6is used for mounting the motor5of power assembly and a blower7in the heat dissipation mechanism, forms heat dissipation passages with the air inlet151and the air outlet152, and improves a heat dissipation effect inside the chainsaw through the heat dissipation passages. In an embodiment, the air guiding cover6includes a first cover61and a second cover62, and the first cover61may be detachably connected with the second cover62for a quick mounting. However, it is not limited to this. A specific connection method between the first cover61and the second cover62may be determined according to actual needs. For example, the first cover61and the second cover62may also be integrally formed.

In this embodiment, it is explained that the first cover61and the second cover62are detachably connected. The first cover61is a hollow cylinder. The first cover61is sleeved on an outside of the motor5and is fixedly connected with the first casing15through bolts. A length of the motor5is greater than a length of the first cover61, and cooling airflow can enter the first cover61from a gap between the first cover61and the first casing15. A structure of the second cover62is volute-shaped, and the second cover62is fixed with the first cover61through the bolts.

In an embodiment, please refer toFIG.6. A plurality of threaded holes is opened on the first cover61, a plurality of mounting holes is opened on the second cover62, and the threaded holes correspond to the mounting holes. The bolts may be provided, and the bolts shall be threaded into the threaded holes after passing through the mounting holes. Through connecting the bolt and the threaded hole, the first cover61and the second cover62are connected with each other, so that a detachable connection is realized. At the same time, a blower chamber (not indicated in the figure) is formed between the second cover62and a bottom wall of the motor5, and the blower chamber is used for accommodating the blower7. Further, a cavity64is formed between the first cover61and the second cover62, and the airflow is allowed to flow in the cavity64. Therefore, when the airflow is flowing in the cavity64, the flowing airflow may carry away the heat in the cavity64.

Further, please refer toFIG.6. An air guiding opening63is opened on the air deflector6, and the air guiding opening63is formed by splicing the first cover61and the second cover62. The air outlet152is arranged at the bottom of the first casing15, and the air guiding opening63is aligned with the air outlet152. It should be noted that a side wall of the air guiding opening63is attached to an inner wall of the first casing15located at the air outlet152, thereby forming an air passage communicated with the outside. The flowing airflow may be discharged through the air guiding opening63and the air outlet152. It should be noted that, a side of the first cover61away from the second cover62is further connected with an air guiding tube611, a first end of the air guiding tube611is connected with the motor5, and a second end of the air guiding tube611is communicated with the cavity64. Therefore, the heat generated by the motor5in the working process enters the cavity64through the air guiding tube611, and flowing air enters the cavity64through the air guiding tube611, is discharged by the air guiding opening63on the air guiding cover6, and then takes away the heat generated by the motor5. When the motor5rotates, the blower7is driven to rotate. The blower7discharges air in the second cover62through the air guiding opening63. A negative pressure is formed in the second cover62, and guides air in the first cover61to the second cover62, thereby forming the airflow. The cooling airflow for cooling the motor5is discharged from the first cover61, the second housing62and the air outlet151, and does not exchange heat with the air in the housing1, which guarantees cooling efficiency.

In addition, connecting the air guiding opening63with the air outlet152closely may further prevent the hot airflow from flowing to other positions in the housing1when the hot and cold airflow in the blower chamber is exchanged, thereby reducing the heat dissipation effect. Therefore, after the airflow enters the chainsaw through the air inlet151and passes through the cavity64and the air guiding opening63in turn, the airflow is discharged from the chainsaw by the air outlet152, and then the heat generated by the chainsaw in the working process is taken away. Wherein, a specific shape of the air inlet151may be determined according to actual needs. For example, the air inlet151may also be a rectangle, a circle, a polygonal and other shapes. In an embodiment of the disclosure, the second cover62is independently arranged with the first casing15, thus ensuring a versatility of this heat dissipation method. Of course, the second cover62may also be fixedly connected with the casing15or integrally formed with it.

In this disclosure, please refer toFIG.7andFIG.8. An area of the air guiding opening63is further the same as an area of the air outlet152, so that when the air guiding opening63discharges the air, the air outlet152may directly discharge the air discharged by the air guiding opening63to the outside. A phenomenon of turbulence does not appear at the air outlet152, air outlet efficiency is further improved, and the heat dissipation effect is also increased.

Please refer toFIG.10andFIG.11. In an embodiment, the protective part8is located at a position of the air inlet151, and the protective part8is connected with the housing1. Through the protective part8, the impurity and the small amount of liquid may be avoided from entering the housing1through the air inlet151. The protective part8may be allowed to include a protective plate82and a connecting plate81. One end of the connecting plate81arranged opposite to the heat dissipation passage and away from the protective plate82is fixedly connected with a top of the housing1. Wherein, the protective plate82is fixedly connected with the connecting plate81. An angle between the protective plate82and the connecting plate81is allowable to be between 60° and 90°, and the angle between the protective plate82and the connecting plate81is directed to the outside of the air inlet151. In an embodiment, the angle between the protective plate82and the connecting plate81is 90°, and a projection of the air inlet151on the protective plate82is completely located within the protective plate82. When the angle between the protective plate82and the connecting plate81is between 60° and 90°, water stain on the protective plate82may be avoided from flowing into the housing1autonomously. At the same time, since a projection of a boundary position of the air inlet151on the protective plate82is completely located within the protective plate82, impurities such as the water stains may be effectively guaranteed to fall on the protective plate82as much as possible when the impurities enter the housing1through the air inlet151. Therefore, when the airflow passes through the air inlet151, the protective plate82may be used to change a direction of the airflow so as to avoid the airflow directly entering the housing1of the chainsaw. Since the air inlet151is an open structure, water and dust may enter the housing1through the air inlet151in a daily use of the chainsaw, which has an impact on the chainsaw. However, through arranging the protective part8on the air inlet151, the protective part8may block the dust and water appropriately, so as to avoid the airflow directly entering the chainsaw.

Please refer toFIG.11. In an embodiment, an edge of the protective part8on the heat dissipation passage is provided with a strip-shaped protruding rib83. The protruding rib83is connected with the protective plate82, and the protruding rib83is located at the edge position of the protective plate82. It should be noted that, the protruding rib83is arranged along the edge of the protective plate82and is higher than the protective plate82, so the protruding rib83may block the water stain on the protective plate82, so as to improve a protective effect of the protective plate82.

Please refer toFIG.12throughFIG.14. In this embodiment, a mounting groove161is arranged on the second casing16in the housing1close to the cutter2. The mounting groove161is arranged along the length direction of the housing1. The tensioning assembly4is placed in the mounting groove161, and a first end of the tensioning assembly4is fixedly connected with a bottom wall of the mounting groove161through a pin436. In addition, it should be noted that, an embedded hole16121is opened in a side wall of the mounting groove161close to the cutter2. A second end of the tensioning assembly4extends into the embedded hole16121, so that the two ends of the tensioning assembly4are fixed, and the tensioning assembly4is supported by the housing1.

Please refer toFIG.15throughFIG.17. The tensioning assembly4includes a fixing part41, an adjusting part42and a transmitting component43.

One end of the fixing part41away from the cutter2is fixed with the bottom wall of the mounting groove161through the pin436, and a plurality of grooves for mounting gears in the transmission component43and a plurality of through holes for shafts of the gears to pass through are arranged on the fixing part41. The fixing part41is fixed with the bottom wall of the mounting groove161through the pin436. Through a matching and fixing of the mounting groove161and the pin436, a connection stability of the tensioning assembly4on the housing1may be increased. In addition, one end of a transmission rod433away from a second fixing part412abuts against the side wall of the mounting groove161, so that the transmission rod433also plays a certain supporting role to the fixing part41.

The adjusting part42is slidably connected with the fixing part41through the transmitting component43, and the adjusting part42is L-shaped. A second connecting shaft435is fixed on a side plate with a longer length in the adjusting part42, and the second connecting shaft435is fixedly connected with the guiding bar22. The second connecting shaft435passes through a through hole on the guiding bar22to realize a connection between the adjusting part42and the guiding bar22, so that the guiding bar22may reciprocate with the adjusting part42.

One end of the transmitting component43extends into the embedded hole16121to realize a quick mounting of the tensioning assembly4and the housing1.

In this embodiment, the transmitting component43includes a driving helical gear431, a driven helical gear432and the transmission rod433. Wherein, the driven helical gear432is rotatably connected in the groove of the fixing part41, and an axis of the driven helical gear432is in a same direction as a length direction of the fixing part41. The transmission rod433is arranged along the length direction of the fixing part41. A first end of the transmission rod433is coaxially fixed with the driven helical gear432. A middle section of the transmission rod433is rotatably connected with the fixing part41through a bearing, and an external thread is formed on a surface of a section of the transmission rod433close to the cutter2, and is in a threaded connection with the adjusting part42through external threads. A second end of the transmission rod433extends into the embedded hole16121. In addition, it should be noted that, one end of the transmission rod433extending into the embedded hole16121is unthreaded and in a smooth rod structure, so that it may rotate in the embedded hole16121.

Further, in an embodiment of the disclosure, the fixing part41includes a first fixing part411and the second fixing part412. The first fixing part411is a mounting block, and one end of the first fixing part411away from the cutter2is fixed with the bottom wall of the mounting groove161through the pin436. The second fixing part412adopts a rounded lug plate. In some embodiments, the first fixing part411and the second fixing part412are integrally formed.

Corresponding to the first fixing part411and the second fixing part412, the mounting groove161includes a first mounting groove161land a second mounting groove1612. The first fixing part411and the driving helical gear431are arranged in the first mounting groove1611, and the second fixing part412, the adjusting part42, the driven helical gear432and the transmission rod433are arranged in the second mounting groove1612. The second fixing part412is fixedly connected with a bottom wall of the second mounting groove1612through the pin436, and the embedded hole16121is opened in a side wall of the second mounting groove1612close to the saw chain21.

Further, in order to effectively control a moving trajectory of the adjusting part42along the transmission rod433, a first blocking wall16122and a second blocking wall16123in a stepped shape are arranged on an inner side wall of the second mounting groove1612, and the first blocking wall16122and the second blocking wall16123are perpendicular to each other. Correspondingly, a side wall of the adjusting part42extends toward an inner side wall of the second mounting groove1612, thereby forming the blocking edge421. The blocking edge421abuts against the first blocking wall16122of the inner side wall of the second mounting groove1612, thereby limiting a movement range of the adjusting part42in a length direction of the transmission rod433. The blocking edge421abuts against the second blocking wall16123of the inner side wall of the second mounting groove1612, thereby limiting a movement range of the adjusting part42in a width direction of the transmission rod433.

In this embodiment, in a process of mounting the tensioning assembly4, the transmission rod433of the tensioning assembly4may extend into the embedded hole16121, and the fixing part41in the tensioning assembly4is fixed through the pin436, so that a stable mounting of the tensioning assembly4is realized. The driving helical gear432is rotatably connected with the first fixing part411, located on an upper side of the driven helical gear432and meshed with the driven helical gear432. And a first connecting shaft434is coaxially fixed on the driving helical gear431. The first connecting shaft434passes through the side wall of the adjusting part42and extends to the outside of the housing1, and a knob (not marked in the figure) is fixed at one end of the first connecting shaft434away from the driving helical gear431.

In actual work, the user may rotate the knob and enable the driving helical gear431to rotate through a rotation of the first connecting shaft434, thereby driving the driven helical gear432to rotate, and then driving a rotation of the transmission rod433. The rotation of the transmission rod433drives the adjusting part42to move along a length direction of the second mounting groove1612. And since the first blocking wall16122and the second blocking wall16123of the second mounting groove1612abut against the blocking edge421of the adjusting part42in the length direction and width direction, the adjusting part42is adjusted and moved according to a trajectory of the length direction of the second mounting groove1612, and an adjusting range of the adjusting part42is limited.

In summary, the disclosure arranges the air guiding cover in the housing and placing the motor and the blower in the air guiding cover, so that it has a certain guiding effect on the airflow generated by the blower, which prevents the hot airflow around the motor from flowing in the housing. Through closely connecting the air guiding opening with the air outlet, the hot airflow may be prevented from flowing to other positions in the housing during the exchange of hot and cold air in the blower chamber, which may cause reducing the heat dissipation effect. Through setting the area of the air guiding opening to be the same as the area of the air outlet, the air outlet may directly discharge the air discharged from the air guiding opening to the outside when the air guiding opening is discharging, and there will be no turbulence at the air outlet, which further improves the air outlet efficiency and increases the heat dissipation effect.

Further, the fixing part is fixed with the bottom wall of the mounting groove through the pin, so that the connection stability of the tensioning assembly on the housing may be increased. In addition, an end of the transmission rod away from the fixing part extends into the embedded hole of the mounting groove, so that a quick fixation of the tensioning assembly may be realized, and the connection stability between the tensioning assembly and the housing is improved. Further, the first blocking wall and the second blocking wall are arranged through the inner side wall of the mounting groove in the stepped shape, the blocking edge is formed on the side wall of the adjusting part, and the blocking edge abuts against the first blocking wall and the second blocking wall at a step of the inner side wall of the mounting groove, so that the limiting of the adjusting range of the adjusting part is realized.

At the same time, the disclosure may effectively improve a problem that impurities and a small amount of liquid enter the housing through the air inlet in a process of use of the chainsaw. The heat dissipation passages are formed between the air inlet, the cavity, the air guiding opening, and the air outlet, and at the same time, the protective part is arranged at the bottom of the air inlet. The protruding ribs are arranged at the edge of the protective plate, which can effectively block moisture and dust while ensuring the heat dissipation, and prevents the dust and moisture carried in the airflow from directly entering an inside of the housing from the air inlet and damaging the motor. Therefore, the disclosure effectively overcomes various shortcomings in the prior art, thereby having high industrial utilization value.

The above embodiments only illustrate principles and effects of the disclosure, but are not intended to limit the disclosure. Anyone familiar with this technology may modify or change the above embodiments without departing from a scope of the disclosure. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the technical ideas disclosed in the disclosure shall still be covered by the claims of the disclosure.

In the description herein, a number of specific details, such as embodiments of components and/or methods, are provided to provide a complete understanding of the embodiments of the disclosure. However, those skilled in the art will recognize that embodiments of the disclosure may be practiced without one or more specific details or by other equipment, systems, assemblies, methods, components, materials, parts, etc. In other cases, the structure, material, or operation of that are commonly understood is not specified or described in detail so as to avoid obscuring aspects of the embodiments of the disclosure.

In the description of this specification, a description with reference to the terms “this embodiment”, “embodiment”, “specific embodiment”, etc. means that a specific feature, structure, or characteristic described in connection with this embodiment or example is included in at least one embodiment, and not necessarily in all embodiments. In this specification, schematic representations of the above terms in “this embodiment”, “embodiment”, “specific embodiment” do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. It should be understood that other variants and modifications of the embodiments of the disclosure described and shown herein may be taught herein and will be deemed to be part of scope of the disclosure.

It should also be understood that one or more of the components shown in the drawings may also be implemented in a more separate or integrated manner, or may even be removed because it cannot be operated in some cases or may be provided because it is useful according to a particular application.

In addition, unless expressly indicated otherwise, any marking arrows in the drawings should be regarded only as exemplary instead of limiting. What's more, unless specified otherwise, the term “or” as used herein generally means “and/or.” In cases where the term is foreseen because it is unclear to provide separation or combination capabilities, the combination of components or operations will also be regarded as specified.

As used in the description herein and throughout the claims below, unless otherwise indicated, “a” and “the” include plural references. Similarly, as used in the description herein and throughout the claims below, unless otherwise indicated, “in the . . . ” includes “in the . . . ” and “on the . . . ”.

The above description of the illustrated embodiment of the disclosure (including content described in the abstract of the specification) is not intended to exhaustively enumerate or limit the disclosure to the precise form provided herein. Although specific embodiments of the disclosure and examples of the disclosure are described herein for illustrative purposes only, as those skilled in the art recognize and understand, various equivalent modifications are possible within the scope of the disclosure. As pointed out, these modifications may be made to the disclosure according to the above description of the embodiments of the disclosure, and these modifications will be within the scope of the disclosure.

This specification has generally described the system and method which are helpful in understanding the details of the disclosure. In addition, various specific details have been given to provide an overall understanding of the embodiments of the disclosure. However, those skilled in the relevant art will recognize that the embodiments of the disclosure may be realized without one or more specific details, or may be implemented through using other devices, systems, accessories, methods, assemblies, materials, parts, etc. In other cases, well-known structures, materials, and/or operations are not specifically shown or described in detail to avoid confusion in various aspects of the embodiments of the disclosure.

Therefore, although the disclosure has been described herein with reference to its specific embodiments, a freedom of modification, various changes and substitutions are also included in the above disclosure. And it should be understood that in some cases, without departing from the scope of the disclosure, some features of the disclosure will be adopted under the conditions without corresponding use of other features. Therefore, many modifications may be made to enable a specific environment or material to adapt the essential scope of the disclosure. The disclosure is not intended to limit the specific terms used in the claims and/or specific embodiments disclosed as the best embodiment for carrying out the disclosure, but the disclosure will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the disclosure will only be determined by the appended claims.