Chainsaw

Abstract

The present invention discloses a chain saw, comprising: a connecting rod; a front-end housing for supporting the motor; an output device supported by the front-end housing, including: a guide plate detachably mounted to the front-end housing; a chain wound around the guide plate; a sprocket connected to the motor for driving the chain to move; the chain saw further includes: a chain tensioning assembly, including: a first limiting member storing a driving force for driving the guide plate to have a tendency to move away from the sprocket in a first direction; a second limiting member, when the guide plate is mounted to the front-end housing, the chain tensioning assembly has a first limiting state and a second limiting state, when the chain tensioning assembly is in the first limiting state, the first limiting member supports the guide plate, and when the chain tensioning assembly is in the second limiting state, the first limiting member and the second limiting member jointly support the guide plate. The chain tensioning assembly of this chain saw can automatically adjust the tension of the chain and improve the reliability of the chain tensioning assembly.

Description

Technical Field

[0001] The present invention relates to a garden tool, and more particularly to a chainsaw. Background Art

[0002] As a garden tool, a chainsaw can be used to repair tree branches, and cutting operations on objects at high or far distances can be achieved through the chainsaw. The chainsaw cuts the workpiece through a chain and has a guide plate for guiding the chain. When replacing the chain and using the chainsaw, it is necessary to adjust the tension of the chain. There is a chain tensioning assembly in the market that can automatically adjust the chain tension, and the adaptability between the chain and the guide plate can be automatically adjusted through the elasticity of the chain tensioning assembly. However, with the long-term operation of the chainsaw, the chain tensioning assembly is prone to elastic failure, thus unable to effectively support the guide plate, reducing the service life of the chainsaw and the performance of long-term operation. Summary of the Invention

[0003] To solve the deficiencies of the prior art, the purpose of the present invention is to provide a chainsaw, in which the chain tensioning assembly of the chainsaw can automatically adjust the tension of the chain and improve the reliability of the chain tensioning assembly.

[0004] To achieve the above main invention purpose, a long-bar chainsaw is provided, including: a connecting rod; a front-end housing for supporting the motor; an output device supported by the front-end housing, including: a guide plate detachably mounted on the front-end housing; a chain wound around the guide plate; a sprocket connected to the motor for driving the chain to move; the chainsaw further includes: a chain tensioning assembly, including: a first limiting member storing a driving force for driving the guide plate to have a tendency to move away from the sprocket in a first direction; a second limiting member, when the guide plate is mounted on the front-end housing, the chain tensioning assembly has a first limiting state and a second limiting state. When the chain tensioning assembly is in the first limiting state, the first limiting member supports the guide plate, and when the chain tensioning assembly is in the second limiting state, the first limiting member and the second limiting member jointly support the guide plate.

[0005] Optionally, when the chain tensioning assembly is in the first limiting state, in the first direction, the distance between the second limiting member and the guide plate is less than the distance between the first limiting member and the guide plate.

[0006] Optionally: the first limiting member is an elastic member; the chain tensioning assembly further includes: a fixing member connecting the first limiting member and the front-end housing.

[0007] Optionally: the second limiting member is arranged on both sides of the first limiting member, and the second limiting member is located between the guide plate and the sprocket.

[0008] Optionally: the elastic modulus of the second limiting member is less than the elastic modulus of the first limiting member.

[0009] Optionally, when the guide plate is installed on the front end housing, the first limiting member abuts against the guide plate, and the distance between the second limiting member and the guide plate in the first direction is greater than or equal to 0.1 mm and less than or equal to 0.35 mm.

[0010] Optionally, the first limiting member includes: a connecting portion connected to the front end housing through a fixing member; an abutting portion forming a limiting surface in the direction towards the guide plate. When the guide plate is installed on the front end housing, the limiting surface abuts against the side surface of the guide plate, and the limiting surface generates displacement in the first direction along with the elastic deformation of the first limiting member.

[0011] Optionally, the front end housing further includes: a stopper disposed between the sprocket and the first limiting member; the first limiting member further includes a hook disposed away from the limiting surface, and the hook is connected to the stopper.

[0012] Optionally, the guide plate further includes: a central hole extending along the first direction; the front end housing further includes: a limiting pin, which passes through the central hole when the guide plate is installed on the front end housing.

[0013] Optionally, the chain tensioning assembly further includes: a bolt capable of providing a pressing force for connecting the guide plate and the front end housing; an operating member connected to the bolt to adjust the pressing force that the bolt can provide. Description of the Drawings

[0014] Figure 1 is a three-dimensional structure diagram of a chainsaw according to the first embodiment of the present invention.

[0015] Figure 2 is Figure 1 a three-dimensional structure diagram of the front end assembly of the chainsaw in

[0016] Figure 3 is Figure 1 a cross-sectional view of the front end assembly of the chainsaw in

[0017] Figure 4 is Figure 1 an internal structure diagram of the front end assembly of the chainsaw in

[0018] Figure 5 is Figure 1 a cross-sectional view of the front end mechanism of the chainsaw in

[0019] Figure 6 is Figure 1 a plan view of the chainsaw in

[0020] Figure 7 is Figure 1 an internal structure diagram of the rear end housing of the chainsaw in

[0021] Figure 8 is Figure 1 an internal structure diagram of the front end mechanism of the chainsaw in

[0022] Figure 9 is Figure 1 Internal structure diagram of the front-end mechanism of a medium-sized chainsaw.

[0023] Figure 10 is Figure 1 Planar schematic diagram of the front-end mechanism of a medium-sized chainsaw.

[0024] Figure 11 is Figure 1 Internal schematic diagram of the front-end mechanism of a medium-sized chainsaw.

[0025] Figure 12a is Figure 1 Planar schematic diagram of the front-end mechanism of a medium-sized chainsaw.

[0026] Figure 12b is Figure 1 Internal schematic diagram of the front-end mechanism of a medium-sized chainsaw with the auxiliary housing removed.

[0027] Figure 13 is Figure 1 Dimension schematic diagram of a medium-sized chainsaw.

[0028] Figure 14 Schematic structural diagram of an embodiment of the chainsaw of the present invention.

[0029] Figure 15 Schematic three-dimensional structural diagram of an embodiment of the chainsaw of the present invention.

[0030] Figure 16 is Figure 15 Schematic diagram of the head structure of a medium-sized chainsaw.

[0031] Figure 17 is Figure 15 Cross-sectional schematic diagram of the chain tensioning element of a medium-sized chainsaw in the first installation position.

[0032] Figure 18 is Figure 15 Cross-sectional schematic diagram of the chain tensioning element of a medium-sized chainsaw in the second installation position.

[0033] Figure 19 is Figure 16 Explosion schematic diagram of the head structure of a medium-sized chainsaw.

[0034] Figure 20 is Figure 19 Enlarged schematic diagram of the positioning hole of a medium-sized chainsaw.

[0035] Figure 21 is Figure 15 Planar schematic diagram of the chain tensioning element and locking element of a medium-sized chainsaw.

[0036] Figure 22 is Figure 21Schematic cross-sectional views of a first cross-section and a second cross-section of a chain tensioning element of a mid-chain saw.

[0037] Figure 23 is a plan view of a chain tensioning element and a locking member of a chain saw according to an embodiment of the present invention. Detailed Embodiment

[0038] The chain saw 100 of the present invention is a common gardening tool, which can be a chain saw or a long pole type chain saw, and can be used for repairing tree branches and the like. The present invention will be specifically introduced below with reference to the accompanying drawings and specific embodiments.

[0039] Refer to Figures 1 to 5 , taking the long pole type chain saw as an example, the chain saw 100 includes: a front end assembly 101 and a connecting rod 140. The front end assembly 101 is used for outputting operations, and the front end assembly 101 is disposed at the front end of the connecting rod 140.

[0040] The front end assembly 101 includes a motor 110, an output device 120, and a front end housing 130. The output device 120 includes a guide plate 121 and a chain 122 wound around the guide plate 121. The motor 110 includes a motor shaft 111 that can rotate around a first axis 102. By rotating the motor shaft 111, the driving chain 122 is rotated to perform a cutting operation. The front end housing 130 is used to support the motor 110 and the output device 120. The front end housing 130 is disposed at the front end of the connecting rod 140. The connecting rod 140 is a long rod with a certain length, so that the user can send the chain 122 to a tree branch or other distant positions to perform a cutting operation.

[0041] The chain saw 100 further includes a transmission mechanism 150. The transmission mechanism 150 connects the motor 110 and the output device 120. The front end housing 130 includes a first housing 131 and a second housing 132. A first accommodation chamber 133 and a second accommodation chamber 134 are formed between the first housing 131 and the second housing 132. The first accommodation chamber 133 is used to accommodate the motor 110, and the second accommodation chamber 134 is used to accommodate the transmission mechanism 150. The first housing 131 and the second housing 132 constitute a split housing structure of the front end housing 130. By joining the first housing 131 and the second housing 132, the clamping of the motor 110 and the transmission mechanism 150 is achieved. That is, the gearbox for fixing the transmission mechanism 150 is simultaneously formed by the first housing 131 and the second housing 132 when they are spliced, so that the gearbox and the front end housing 130 are integrally formed, and there is no need to provide a separate gearbox to fix the transmission mechanism 150, thereby reducing the size of the front end assembly 101 and the weight of the front end assembly 101.

[0042] The second accommodation chamber 134 is provided in the front end housing 130. The transmission mechanism 150 includes a transmission gear 151, an output shaft 152, and a sprocket 153. The transmission gear 151 can be set as a bevel gear. The end of the motor shaft 111 is provided with a conical structure that cooperates with the transmission gear 151, and the transmission gear 151 meshes with the end of the motor shaft 111 of the motor 110. The transmission gear 151 and the output shaft 152 are connected in a synchronously rotatable manner, and the output shaft 152 drives the sprocket 153 to rotate. The chain 122 is driven by the sprocket 153 to move on the guide plate 121.

[0043] Referring to Figure 1 and Figure 6 , the chainsaw 100 further includes a rear end housing 170. The rear end housing 170 forms a handle 171 and a battery pack interface 172. The handle 171 is for the user to hold, and the handle 171 has a D-shaped structure, which forms a holding opening through which the user can insert fingers to hold the handle 171. The handle 171 is provided at the end of the connecting rod 140, such that the connecting rod 140 is relatively arranged on one side of the handle 171. The battery pack interface 172 is for installing the battery pack 173. The battery pack 173 can supply electrical energy to the motor 110. The battery pack 173 is detachably installed on the battery pack interface 172. When the battery pack 173 is installed on the battery pack interface 172, the battery pack 173 is located below the handle 171, and the handle 171 is connected to the battery pack interface 172. Optionally, the battery pack interface 172 and the handle 171 are integrally formed. The chainsaw 100 is generally used for cutting operations on objects at a distance or at a height. It has a certain length and is heavy. By setting the handle 171 at the end of the connecting rod 140, the length of the connecting rod 140 can be fully utilized, and the design of the D-shaped handle 171 enables the user to stably hold the handle 171, thus realizing a long-lasting operation for high-altitude cutting operations.

[0044] The connecting rod 140 connects the front end assembly 101 and the handle 171. The connecting rod 140 has a second axis 103 passing through its interior, and the connecting rod 140 is arranged to extend along its second axis 103.

[0045] Optionally, the connecting rod 140 includes a first connecting rod 141, a second connecting rod 142, and an extension rod 143. The first connecting rod 141 and the second connecting rod 142 are detachably connected, and the extension rod 143 is detachably connected between the first connecting rod 141 and the second connecting rod 142. When the extension rod 143 is connected between the first connecting rod 141 and the second connecting rod 142, the length of the chainsaw 100 on the first axis 102 is greater than or equal to 2.4 m and less than or equal to 3.2 m. That is, through the cooperation of the first connecting rod 141 and the second connecting rod 142, the chainsaw 100 can achieve two working states. In the first state, the extension rod 143 is disposed between the first connecting rod 141 and the second connecting rod 142, so that the chainsaw 100 has the maximum length. In the second state, the first connecting rod 141 is directly connected to the second connecting rod 142, so that the weight of the chainsaw 100 is relatively light. The user can choose whether to install the extension rod 143 according to their working requirements, so as to meet the needs of high-distance operations and also achieve weight reduction when performing relatively short-distance operations.

[0046] The motor 110 further includes a rotor sleeve 112, a stator core 113, and a stator coil 114. The rotor sleeve 112 is mounted on the motor shaft 111 and rotates synchronously with the motor shaft 111. Both ends of the motor shaft 111 pass through the rotor sleeve 112. The stator core 113 is at least partially disposed within the rotor sleeve 112 and is used for winding the stator coil 114. The diameter D1 of the rotor sleeve 112 is less than or equal to 38 mm, which can reduce the volume of the motor 110 and also reduce the weight of the motor 110, thereby optimizing the overall dimensions of the machine and facilitating the user to operate the long-bar chainsaw 100. As the size of the motor 110 is reduced, the size of the transmission mechanism 150 can be correspondingly reduced. The diameter D2 of the output shaft 152 is set to be greater than or equal to 8 mm and less than or equal to 12 mm, and the transmission ratio output by the transmission mechanism 150 is greater than or equal to 3.3 and less than or equal to 5. Through the transmission of the transmission mechanism 150, the output shaft 152 rotates at a lower speed than the motor 110 and the torque provided by the output shaft 152 is increased. The reduction in the size of the motor 110 and the transmission mechanism 150 enables the sizes of the first accommodation chamber 133 and the second accommodation chamber 134 for accommodating the motor 110 and the transmission mechanism 150 to be correspondingly reduced, which can reduce the weight of the front-end housing 130, thereby achieving the purpose of reducing the volume and weight of the front-end housing 130.

[0047] Therefore, while meeting the rated output power of the motor 110, the diameter of the rotor sleeve 112 is reduced such that the diameter D1 of the rotor sleeve 112 is less than or equal to 38 mm, and the weight of the motor 110 is greater than or equal to 1.5 kg and less than or equal to 2 kg, such that the ratio of the rated output power P of the motor 110 to the maximum weight m1 of the chainsaw 100 is greater than or equal to 190 W / kg and less than or equal to 240 W / kg. The maximum weight m1 of the chainsaw 100 refers to the overall weight of the chainsaw when the battery pack 173 is not installed. The maximum weight m1 of the chainsaw 100 refers to the weight of the chainsaw 100 in the first state, i.e., the overall weight when the extension rod 143 is installed. Optionally, the rated output power P of the motor 110 is set to be greater than or equal to 600 W and less than or equal to 960 W, and the ratio of the rated output power P of the motor 110 to the voltage of the motor 110 is set to be greater than or equal to 24 W / V and less than or equal to 38.5 W / V.

[0048] The connecting rod 140 extends along the second axis 103. In this embodiment, the second axis 103 is parallel to or coincides with the first axis 102. That is to say, the motor 110 is arranged in the front-end housing 130 along the direction of the second axis 103. When the chainsaw 100 is in the first state, the ratio of the weight m2 of the front-end assembly 101 to the length L1 of the chainsaw 100 in the direction of the second axis 103 is greater than or equal to 0.4 kg / m and less than or equal to 0.8 kg / m. The weight of the front-end assembly 101 is set to be greater than or equal to 1.4 kg and less than or equal to 1.9 kg. Optionally, the weight of the front-end assembly 101 is set to be greater than or equal to 1.6 kg and less than or equal to 1.7 kg. The reduction of the weight of the motor 110 can effectively make the front-end of the long-bar chainsaw 100 lighter, and the user can lift the whole machine very labor-saving, thereby reducing the fatigue of the user when operating the long-bar chainsaw 100 and effectively extending the time that the user can continuously operate the chainsaw 100 to improve the operation comfort and work efficiency.

[0049] As Figure 1 and Figure 7 shown, the chainsaw 100 further includes a controller 160 and a drive circuit. The controller 160 is specifically a circuit board. The controller 160 is used to control the rotation of the motor 110, and the controller 160 is electrically connected to the motor 110. The controller 160 is arranged in the rear-end housing 170. The controller 160 is connected to the battery pack 173 and the motor 110 through the drive circuit to control the operation of the motor 110.

[0050] The chain saw 100 further includes a fan 180 and a fan housing 181. The fan 180 rotates about a fan axis and is used to dissipate heat inside the rear housing 170, thereby alleviating the temperature rise generated by the controller 160 during the operation of the chain saw 100. The fan housing 181 is used to accommodate the fan 180. The fan housing 181 is disposed opposite to the rear housing 170. The fan 180 can generate a heat dissipation air flow inside the rear housing 170, and the heat dissipation air flow flows through the controller 160, thereby reducing the operating temperature of the controller 160.

[0051] The connecting rod 140 passes through the fan housing 181 and extends into the rear housing 170. The fan housing 181 is disposed around the connecting rod 140. The fan housing 181 is independent of the rear housing 170. In the direction of the second axis 103, the fan housing 181 is spaced apart from the rear housing 170 by a certain distance. A duct 184 is further provided between the fan housing 181 and the rear housing 170. The duct 184 connects the fan housing 181 and the rear housing 170. The included angle between the fan axis and the projection of the second axis on the plane where the guide plate is located is greater than or equal to 0 degree and less than or equal to 30 degrees, thereby increasing the air volume of the heat dissipation air flow passing through the controller 160. The rear housing 170 includes a connection port. The duct 184 is connected to the connection port, and the connection port is disposed between the fan 180 and the controller 160. Optionally, the duct 184 is arranged to extend along a first straight line. At this time, the included angle between the fan axis extending along the first straight line 104 and the projection of the first straight line 104 on the plane where the guide plate 121 is located is greater than or equal to 0 degree and less than or equal to 30 degrees, thereby increasing the air volume of the heat dissipation air flow passing through the controller 160. The first straight line 104 is parallel to the second axis 103. The fan 180 can be a suction fan 180 or a blowing fan 180. The distance between the fan housing 181 and the connection port is set to be less than or equal to 40 mm. Optionally, the first straight line 104 passes through the connection port, the fan 180, and the controller 160, so that a part of the air flow generated by the fan 180 can flow parallel to the surface of the controller 160, thereby improving the heat dissipation efficiency inside the rear housing 170. Optionally, the fan axis is parallel to the first straight line 104, so that the fan face of the fan 180 is disposed facing the connection port, and the fan face of the fan 180 faces the controller 160. Optionally, the duct 184 is a plastic pipe.

[0052] The chain saw 100 further includes a heat sink 183 which is in direct or indirect contact with the connecting rod 140. The heat sink 183 is in surface contact with the controller 160 to form a mating surface, and the area of the mating surface is set to be greater than or equal to 2000 square millimeters and less than or equal to 3000 square millimeters, so as to improve the effective heat dissipation area of the controller as much as possible and prevent the structure in the rear housing from being overly complicated. The rear housing 170 includes a receiving portion, the heat sink 183 and the controller 160 are arranged in the receiving portion, and at the same time, a part of the connecting rod 140 extends into the receiving portion. In this way, while improving the heat dissipation effect, the rear housing 170 can be made more compact. Optionally, both the battery pack interface 172 and the heat sink 183 are located below the connecting rod 140, and the second axis 103 along which the connecting rod 140 extends passes through the handle 171, thereby improving the balance of the user's grip on the handle 171 to operate the chain saw 100 and facilitating the user to sense the relative position of the connecting rod 140 to improve the operation accuracy.

[0053] The rear housing 170 includes a first vent 174, the fan housing 181 includes a second vent 182, and a first straight line 104 passes through the first vent 174 and the second vent 182. The air flow generated by the fan 180 flows in from the first vent 174, passes through the controller 160 and flows out from the second vent 182. Optionally, the air flow generated by the fan 180 flows in from the second vent 182, passes through the controller 160 and then flows out from the first vent 174.

[0054] The first vent 174 is arranged at the front end of the handle 171 and on the side surface of the rear housing 170, and the second vent 182 is formed at the front end of the fan housing 181. Here, it is defined that the motor 110 is relatively located in front of the rear housing 170. One side of the first vent 174 further includes an end cap, so that the opening of the first vent 174 faces away from the handle 171, and the end cap guides the air flow to blow forward, thereby preventing the overheated air flow from blowing towards the user and reducing the user's experience. Optionally, a certain plane where the first straight line 104 is located passes through the first vent 174 and the second vent 182, thereby reducing the air flow turbulence in the rear housing 170 and improving the heat dissipation efficiency. Through the above structure, as Figure 7 shown, the distance L5 between the upper and lower side surfaces of the receiving portion can be set to be greater than or equal to 87 mm and less than or equal to 90 mm.

[0055] The guide plate 121 extends along the first plane 105. With the above structure, the shortest distance L3 from the second axis 103 to the guide plate 121 can be greater than or equal to 16 mm and less than or equal to 17 mm, so as to facilitate the user to flip the chain saw 100, and the cutting surface is closer to the center line of the handle 171, thereby facilitating the user to know the position of the cutting surface where the guide plate 121 is located and facilitating the user's operation.

[0056] As Figure 13As shown, the center of gravity of the chainsaw 100 is located on the connecting rod 140, which extends along the second axis 103. In the direction of the second axis 103, the maximum distance L4 from the center of gravity to the rear end of the chainsaw 100 is greater than or equal to 1100 mm and less than or equal to 1300 mm. The center of gravity is closer to the handle 171, thereby improving the stability of the user's grip.

[0057] As Figure 1 , Figures 8 to 10 As shown, the chainsaw 100 further includes a chain tensioning assembly 190. The chain tensioning assembly 190 can automatically adjust the clearance between the chain 122 and the guide plate 121, thereby improving the fit between the chain 122 and the guide plate 121 and enhancing the cutting efficiency. The chain tensioning assembly 190 includes a first limiting member 191 and a fixing member 1911. The first limiting member 191 stores a driving force for driving the guide plate 121 to have a tendency to move away from the sprocket 153 in the first direction 106. The fixing member 1911 connects the first limiting member 191 and the front end housing 130, and the first limiting member 191 can be relatively fixed to the front end housing 130 in at least one direction through the fixing member 1911. The chain tensioning assembly 190 further includes a bolt 192 and an operating member 193. The bolt 192 can provide a pressing force for connecting the guide plate 121 and the front end housing 130. The operating member 193 is connected to the bolt 192 to adjust the pressing force that the bolt 192 can provide.

[0058] The guide plate 121 extends along the first plane 105, and the bolt 192 is arranged to press the guide plate 121 and the front end housing 130 in a direction perpendicular to the first plane 105. The operating member 193 adjusts the pressing force provided by the bolt 192 to the guide plate 121 and the front end housing 130 by rotating the bolt 192. Optionally, the first limiting member 191 is an elastic member. When the guide plate 121 is installed on the front end housing 130 and fixed by the bolt 192, the rear end of the guide plate 121 contacts the first limiting member 191 and compresses the first limiting member 191. The user loosens the bolt 192 through the operating member 193. At this time, the bolt 192 no longer restricts the displacement of the guide plate 121. The elastic first limiting member 191 pushes the guide plate 121 away from the sprocket 153 along the first direction 106 due to its elasticity, that is, pushes the guide plate 121 to squeeze the chain 122. The chain 122 installed on the side of the sprocket 153 and the guide plate 121 reacts on the guide plate 121 and the first limiting member 191, so that the three are adaptively adjusted to a balanced state. At this time, the user then makes the bolt 192 press the guide plate 121 and the front end housing 130 through the operating member 193, thereby realizing the adjustment of the tension state of the chain 122. The elastic first limiting member 191 can automatically adjust the fitting state between the chain 122 and the guide plate 121, and does not require the user to manually adjust the tension state between the chain 122 and the guide plate 121, thereby improving the use efficiency and cutting performance of the chainsaw 100.

[0059] The first limiting member 191 includes a connecting portion 1912 and an abutting portion 1913. The connecting portion 1912 is connected to the front-end housing 130 by a fixing member 1911. The abutting portion 1913 forms a limiting surface 1915 in the direction towards the guide plate 121. When the guide plate 121 is mounted on the front-end housing 130, the limiting surface 1915 abuts against the side surface of the guide plate 121, and the limiting surface 1915 generates displacement in the first direction 106 along with the elastic deformation of the first limiting member 191. Optionally, the connecting portion 1912 and the abutting portion 1913 form an L shape. The connecting portion 1912 is arranged to be in contact with the surface of the front-end housing 130, and the abutting portion 1913 protrudes relative to the front-end housing 130.

[0060] The chain tensioning assembly 190 has a first limiting state and a second limiting state. When the chain tensioning assembly 190 is in the first limiting state, the first limiting member 191 supports the guide plate 121. When the chain tensioning assembly 190 is in the second limiting state, the first limiting member 191 and the second limiting member 194 jointly support the guide plate 121.

[0061] During the initial use of the first limiting member 191, the biasing force provided by the first limiting member 191 is relatively large. At this time, the guide plate is supported by the first limiting member 191 alone, and the second limiting member 194 is not in contact with the guide plate. During the long-term use of a traditional chainsaw, the first limiting member 191 will generate excessive elastic deformation, so that the chain 122 cannot be fully tensioned relative to the guide plate 121. At this time, when the chain 122 is installed, the first limiting member 191 cannot effectively limit the guide plate 121 in the first direction 106, making the chainsaw 100 prone to shaking and wear during operation. For this reason, the chain tensioning assembly 190 is also provided with a second limiting member 194. When the guide plate 121 is mounted on the front-end housing 130, in the first direction 106, the distance between the second limiting member 194 and the guide plate 121 is greater than the distance between the first limiting member 191 and the guide plate 121. After the elastic deformation of the first limiting member 191 exceeds a certain degree and plastic deformation occurs, the chain tensioning assembly is in the second limiting state, and the second limiting member 194 and the first limiting member 191 simultaneously limit the guide plate 121, thereby reducing the shaking of the chainsaw 100 during operation.

[0062] Optionally, the second limiting member 194 is disposed on both sides of the first limiting member 191, and the second limiting member 194 is located between the guide plate 121 and the sprocket 153, thereby enhancing the stability of the support of the second limiting member 194 for the guide plate 121. The elastic modulus of the second limiting member 194 is less than that of the first limiting member 191. When the guide plate 121 is installed on the front-end housing 130, the first limiting member 191 abuts against the guide plate 121, and the distance L2 between the second limiting member 194 and the guide plate 121 in the first direction 106 is greater than or equal to 0.1 mm and less than or equal to 0.35 mm, thereby reducing the interference of the second limiting member 194 on the adjustment of the tension force of the first limiting member 191 in the normal state, and effectively slowing down when the first limiting member 191 undergoes excessive elastic deformation, the position setting of the second limiting member 194 can achieve the limiting of the guide plate 121.

[0063] The guide plate 121 further includes a central hole 1211 extending along the first direction 106, and the front-end housing 130 further includes a limit pin. When the guide plate 121 is installed on the front-end housing 130, the limit pin passes through the central hole 1211, and the width of the central hole 1211 is matched with the size of the limit pin, so that when the guide plate 121 is installed on the front-end housing 130, the limit pin is within the central hole 1211, enabling the guide plate 121 to move only along the first direction 106.

[0064] The front-end housing 130 further includes a stop member 135, the stop member 135 is disposed between the sprocket 153 and the first limiting member 191, and the first limiting member 191 further includes a hook 1914, the hook 1914 is disposed away from the limiting surface 1915, and the hook 1914 is connected to the stop member 135. Through the fixed connection between the fixing member 1911 and the front-end housing 130, and the clamping connection between the hook 1914 and the stop member 135, the first limiting member 191 is fixed relative to the front-end housing 130 in two directions, thereby enhancing the stability of the first limiting member. The fixing member 1911 can be a screw, making the first limiting member 191 detachable relative to the front-end housing 130, realizing the replaceability of the first limiting member 191. The stop member 135 further forms a slot for supporting the second limiting member 194, and part of the second limiting member 194 is placed into the stop member 135, thereby strengthening the fixation of the second limiting member 194.

[0065] The chain saw 100 further includes an oil supply assembly, the oil supply assembly includes an oil pot 200, an oil pump and an oil pipe, and the oil pot 200 is used for storing the engine oil for lubricating the transmission mechanism 150 and the chain 122. The oil pipe connects the oil pot and the oil pump, and the oil pump extracts the engine oil in the oil pot 200 through the oil pipe and transports it to the transmission mechanism 150 to achieve the lubrication of the chain 122 and the guide plate 121. The oil pump includes a plunger, and the plunger is connected to the transmission mechanism 150 and can be driven by the transmission mechanism 150. When the chain saw 100 is running, the transmission mechanism 150 drives the plunger to reciprocate, so that the oil pump extracts the engine oil from the oil pot 200 and outputs the engine oil to the chain 122.

[0066] The capacity of the oil pot 200 is greater than or equal to 80 ml and less than or equal to 135 ml, and the capacity of the battery pack 173 is set to be greater than or equal to 1.5 AH. When the rated output power of the motor 110 is greater than or equal to 600 W and less than or equal to 960 W, the ratio of the maximum oil supply time of the oil pot 200 to the battery life of the battery pack 173 is greater than or equal to 2 and less than or equal to 5. The oil supply time of the oil pot 200 refers to the cumulative time during which the oil contained in the oil pot 200 when it is full of engine oil can lubricate the transmission mechanism 150 during the operation of the chainsaw 100, which is the maximum oil supply time. Here, the battery life of the battery pack 173 refers to the total time that a fully charged battery pack can supply power for the operation of the power tool when the speed of the motor is greater than or equal to 19,500 revolutions per minute and less than or equal to 25,500 revolutions per minute and the motor is no-load.

[0067] The oil supply assembly further includes a duckbill valve, which is arranged at the oil outlet of the oil pipe. When the oil pump operates, a pressure difference is generated in the oil pipe. At this time, the duckbill valve opens to allow the engine oil to flow through. When the oil pump is not driven by the motor to start, the duckbill valve closes to prevent the engine oil in the oil pipe from flowing out, thereby preventing oil leakage when the chainsaw is not in use.

[0068] The front end housing 130 further includes a fixing portion for fixing the oil pot 200. The diameter D1 of the rotor sleeve 112 is less than or equal to 38 mm, and the size and weight of the motor 110 and the transmission mechanism 150 are reduced, so that the capacity of the oil pot 200 can be relatively increased, thus preventing the front end of the chainsaw 100 from being too heavy for the user to operate conveniently. It is possible to achieve that the ratio of the maximum oil supply time of the oil pot 200 to the battery life of the battery pack 173 is greater than or equal to 2 and less than or equal to 5, that is, after the user uses more than 2 battery packs 173, the oil pot 200 needs to be refilled with engine oil only once, avoiding the situation of frequent refilling of engine oil. Optionally, the ratio of the maximum oil supply time of the oil pot 200 to the battery life of the battery pack is set to an integer, so that the timing of refilling the oil pot 200 is consistent with the timing of replacing the battery pack 173. Thus, the user can refill the engine oil while replacing the battery pack 173, reducing the situation that the transmission mechanism 150 cannot be effectively lubricated due to the lack of engine oil in the oil pot 200 when using the chainsaw 100, reducing the wear of the transmission mechanism 150, and thus improving the service life of the chainsaw 100.

[0069] The first connecting rod 141 is connected to the front-end assembly 101. The first connecting rod 141 includes a first mounting member 1411. The second connecting rod 142 is connected to the handle 171. The second connecting rod 142 includes a first connecting seat 1421. The first mounting member 1411 can be operated to connect or disconnect from the first connecting seat 1421. One end of the extension rod 143 is provided with a second mounting member 1431 for connecting to the first connecting seat 1421, and the other end is provided with a second connecting seat 1432 for connecting to the first mounting member. The first connecting rod 141 and the extension rod 143 further include a clamp 146. The clamp 146 is respectively arranged on the first connecting rod 141 and the extension rod 143, and at least part of the mounting member 144 is restricted between the clamps 146, so as to prevent the first mounting member 1411 and the second mounting member 1431 from detaching from the connecting rod 140 or sliding to a place far from the connection of the connecting rod 140, which is convenient for the user to operate.

[0070] As Figure 1 and Figure 11 shown, the chain saw 100 further includes a motor bracket 210. The motor bracket 210 is clamped by the front-end housing 130 and supports the motor 110. The motor bracket 210 at least includes two support arms 115 arranged crosswise, and the support arms 115 are clamped by the front-end housing 130.

[0071] The front-end housing 130 includes a main housing 136 and an auxiliary housing 137. The main housing 136 is used to support the motor 110 and the transmission mechanism 150. The main housing 136 includes a first housing 131 and a second housing 132. The motor bracket 210 is clamped by the first housing 131 and the second housing 132. The auxiliary housing 137 is used to cover part of the main housing 136 and the output device 120. The sprocket 153 and part of the chain 122 are arranged between the main housing 136 and the auxiliary housing 137. The transmission mechanism 150 is supported by the main housing 136, and the output shaft 152 extends relative to the main housing 136 to between the main housing 136 and the auxiliary housing 137.

[0072] Part of the connecting rod 140 is placed inside the front-end housing 130. As Figure 5 and shown in FIG. 12, the main housing 136 includes a first air inlet 1361, a second air inlet 1362 and an air outlet 1363. The auxiliary housing 137 includes an external air inlet 1371. In the radial direction of the first axis 102, the projection of the first air inlet 1361 at least partially overlaps with the projection of the connecting rod 140. The projections of the second air inlet 1362 and the external air inlet 1371 at least partially overlap with the projection of the motor bracket 210. The projection of the air outlet 1363 and the projection of the motor 110 at least partially overlap. By setting two air inlets, the air intake volume is increased, and the positions of the first air inlet 1361 and the second air inlet 1362 can improve the heat dissipation effect on the motor bracket 210 and the connecting rod 140.

[0073] In one embodiment, as Figure 13 shown, on the premise that the size of the motor 310 is reduced, the motor 310 can be arranged at the side end of the connecting rod 340. At this time, in the direction perpendicular to the first axis, the projections of the motor 310 and the connecting rod 340 partially overlap. The front end housing 330 supporting the output device 320 can be reduced in size in the direction along the first axis, which is convenient for improving the balance of the whole machine.

[0074] In another embodiment of the present invention, referring to Figures 15 to 18 , the chainsaw 100a includes a housing 130a that supports the motor and the output device. The chainsaw 100a further includes a chain tensioning element 190a and a locking member 191a. Through the cooperation of the chain tensioning element 190a and the locking member 191a, the clearance between the chain 122a and the guide plate 121a can be adjusted, thereby improving the adaptability between the chain 122a and the guide plate 121a and enhancing the cutting efficiency.

[0075] Referring to Figure 17 and Figure 18 , the locking member 191a is fixedly connected to the housing 130a. The chain tensioning element 190a can be installed on the locking member 191a along the first installation direction 107, and the locking member 191a can fix the chain tensioning element 190a to at least the first installation position and the second installation position. After the chain tensioning element 190a is placed in the first installation position, the chain tensioning element 190a can move to the second installation position relative to the locking member 191a by continuing to move along the first installation direction 107.

[0076] Referring to Figures 17 to 19 , the chain tensioning element 190a has an adjusting portion 192a that can contact the guide plate 121a. The adjusting portion 192a has a side surface that can contact the guide plate 121a. When the chain tensioning element 190a is connected to the locking member 191a, the adjusting portion 192a abuts against the guide plate 121a. When the chain tensioning element is fixed to the first installation position, the adjusting portion has a first section that contacts the guide plate. When the chain tensioning element is fixed to the second installation position, the adjusting portion has a second section that contacts the guide plate. Among them, in the first direction perpendicular to the first installation direction, the size of the second section is larger than that of the first section.

[0077] In the first installation direction 107, the size of the adjusting portion 192a in the first direction 106a perpendicular to the first installation direction 107 gradually increases or decreases. Through the displacement of the chain tensioning element 190a in the first installation direction 107, the adjusting portion 192a can adjust the tension of the chain relative to the guide plate by changing the size at the contact with the guide plate 121a. The size of the adjusting portion 192a in the first direction 106a can be understood as the length of the adjusting portion in the first direction.

[0078] Referring to Figure 22 , when the chain tensioning element 190a is in the first installation position, the adjusting portion 192a has a first section that supports the guide plate 121a. When the chain tensioning element 190a is in the second installation position, the adjusting portion 192a has a second section that supports the guide plate 121a. In a first direction perpendicular to the first installation direction, the size of the second section is larger than the size of the first section. Optionally, in a plane perpendicular to the first installation direction 107, the first section of the adjusting portion 192a has a first cross-section 1921a, where the first cross-section 1921a refers to the area enclosed by the edges of the first section in the plane where the first direction is located. The second section of the adjusting portion 192a has a second cross-section 1922a, where the second cross-section 1922a refers to the area enclosed by the edges of the second section in the plane where the first direction is located. The first cross-section has a radius R1, and the second cross-section has a radius R2, where R2 is greater than R1, that is, the area of the second cross-section is larger than the area of the first cross-section. Thus, by adjusting the installation position when the chain tensioning element 190a is connected to the locking member 191a, the installation depth of the chain tensioning element 190a in the first installation direction 107 can be adjusted, and the size at the contact between the adjusting portion 192a and the guide plate 121a can be changed. Optionally, along the first installation direction 107, the cross-sectional area of the adjusting portion 192a perpendicular to the first installation direction 107 gradually increases or decreases. Optionally, in a plane along the first installation direction 107, the cross-sectional area of the adjusting portion 192a perpendicular to the first installation direction 107 gradually decreases.

[0079] When the chain tensioning element 190a is moved from the first installation position to the second installation position, the cross-sectional area of the second section in contact with the guide plate 121a is larger than that of the first section, so that the guide plate 121a can be driven to move along the first direction 106a, enabling the guide plate 121a and the chain 122a to be in full contact to adjust the tensioning position of the guide plate 121a relative to the chain 122a. When the chain tensioning element 190a is moved from the second installation position to the first installation position, the moving space of the guide plate 121a can be increased, and the gap between the chain 122a and the guide plate 121a can be increased, facilitating the user to remove the chain 122a from the guide plate 121a.

[0080] Referring to Figure 19 , the housing 130a further includes an installation hole 131a for limiting and locking the locking member 191a, and the chain tensioning element 190a can penetrate into the installation hole 131a along the first installation direction 107. The locking member 191a is disposed in the installation hole 131a. Thus, when the chain tensioning element 190a is placed into the installation hole 131a, it can cooperate with the locking member 191a to be connected to the locking member 191a.

[0081] The housing 130a includes a main housing 132a and an auxiliary housing 133a. The main housing 132a supports the motor, and the auxiliary housing 133a is used to cover part of the main housing 132a and the output device. The guide plate 121a is positioned between the main housing 132a and the auxiliary housing 133a, and the mounting hole 131a is formed in the auxiliary housing 133a. Optionally, the mounting hole can also be formed in the main housing.

[0082] Referring to Figure 20 , the main housing 132a further includes a positioning hole 134a which is arranged to be aligned with the mounting hole 131a in the first mounting direction 107. The main housing 132a is also used to fix the sprocket 153a, and the positioning hole 134a is arranged between the sprocket 153a and the guide plate 121a. When the chain tensioning element 190a is installed into the mounting hole 131a, the end of the chain tensioning element 190a is placed into the positioning hole 134a, realizing the positioning of the chain tensioning element 190a and preventing the chain tensioning element 190a from shaking during the operation of the chainsaw 100a. The chainsaw further includes a knob 1901a which is connected to the chain tensioning element 190a, and the movement of the chain tensioning element 190a is realized through the knob 1901a.

[0083] Optionally, referring to Figure 21 , the chain tensioning element 190a is a tensioning bolt 193a, the locking member 191a is a nut 194a, the adjusting portion 192a is formed on the side surface of the cylinder of the tensioning bolt 193a. The tensioning bolt 193a can be placed into the nut 194a and is at least fixed at the first mounting position and the second mounting position. When the tensioning bolt 193a moves from the first mounting position to the second mounting position, the distance between the guide plate 121a and the chain 122a in the first direction 106a can be adjusted. Here, the first mounting position and the second mounting position refer to the relative position states of the tensioning bolt 193a. During the process of screwing the tensioning bolt 193a into the bolt, in the first mounting direction 107, it can be relatively fixed at multiple positions by the nut 194a, so as to realize the precise adjustment of the tension state of the chain 122a.

[0084] The adjusting portion 192a is conical or frustum-shaped, so that the bolt can be inserted into the nut 194a along the first mounting direction 107 when rotating relative to the nut 194a. The radial dimension of the adjusting portion 192a tapers in the first mounting direction 107. When the bolt moves in the first mounting direction 107, at this time the conical surface approaches the main housing 132a with the rotation of the bolt, and the dimension at the contact between the adjusting portion 192a and the guide plate 121a increases, so that the adjusting portion 192a can push the guide plate 121a to move along the first direction 106a. The first mounting direction 107 can be perpendicular to the first direction 106a or can be set to be relatively inclined to the first direction 106a.

[0085] The tensioning bolt 193a includes a threaded portion 195a, an adjusting portion 192a, and a supporting portion 196a. The supporting portion 196a is provided in a cylindrical shape. The threaded engagement between the threaded portion 195a and the nut 194a enables the tensioning bolt 193a to be fixed at the first installation position and the second installation position in the nut 194a. When the chain tensioning element 190a is placed into the installation hole 131a, the threaded portion 195a engages with the nut 194a, the adjusting portion 192a abuts against the side surface of the guide plate 121a, and the supporting portion 196a is placed into the positioning hole 134a. Thus, after the tensioning bolt 193a is placed into the positioning hole 134a and the installation hole 131a, the tensioning bolt 193a is radially positioned in the first installation direction by the positioning hole 134a and the installation hole 131a, reducing the wobbling of the tensioning bolt 193a during the operation of the chainsaw, so as to stably maintain the current tensioned position of the chain.

[0086] By rotating the tensioning bolt 193a, a small displacement can be generated in the first installation direction for the tensioning bolt 193a, correspondingly adjusting the relative position between the guide plate and the chain 122a. The chain tensioning element proposed in this embodiment can improve the adjustment accuracy of the chain 122a tension through a simple structural design, streamline the overall structure of the chainsaw, reduce the weight, and thus reduce the user's fatigue during the operation of the chainsaw.

[0087] The guide plate 121a further includes a central hole 1211a, and the central hole 1211a extends along the first direction 106a. The chainsaw 100a further includes a bolt 197a and an operating member 198a. The bolt passes through the central hole 1211a, providing a pressing force for connecting the guide plate 121a and the main housing 132a. The operating member 198a is connected to the bolt 197a to adjust the pressing force that the bolt 197a can provide. The bolt 197a is arranged to press the guide plate 121a and the main housing 132a in a direction perpendicular to the plane where the guide plate 121a is located. The operating member 198a adjusts the pressing force provided by the bolt 197a to the guide plate 121a and the main housing 132a by rotating the bolt 197a. Optionally, the bolt passes through the auxiliary housing 133a and the central hole 1211a, so that the auxiliary housing 133a and the main housing 132a are fitted together.

[0088] When the user installs the chain, by adjusting the installation depth of the chain tensioning element 190a relative to the housing 130a, the gap between the guide plate 121a and the chain is adjusted, so that the chain fits the guide plate 121a and the tension of the chain on the guide plate 121a can be adjusted. Then, by rotating the bolt 197a with the operating member 198a, the guide plate 121a and the main housing 132a are pressed to fix the guide plate 121a at the current position.

[0089] Optionally, the chainsaw proposed in this embodiment is a long-bar chainsaw. In this case, the chainsaw includes a connecting rod 140a and a handle 171a. The connecting rod connects the handle and the housing 130a, thereby extending the operable distance of the chainsaw.

[0090] Optionally, the chain tensioning element is an adjusting nut, and the locking member is a bolt. The adjusting portion is formed on the outer wall of the adjusting nut. The bolt is fixedly connected to the housing. The nut can be sleeved around the tensioning bolt and is at least fixed at a first installation position and a second installation position. When the nut moves from the first installation position to the second installation position, the distance between the guide plate and the chain in a first direction can be adjusted.

[0091] Optionally, referring to Figure 23 , the chain tensioning element 190b is a cylinder, one end of which is provided with a groove portion 193b and has an adjusting portion 192b. The groove portion 193b has a plurality of grooves arranged uniformly. The locking member 191b includes a spring 194b and a locking pin 195b. The spring 194b biases the locking pin 195b into one of the grooves of the groove portion 193b. The user presses the locking pin 195b to compress the return spring 194b so that the locking pin 195b disengages from the groove, thereby enabling the depth of the chain tensioning element 190b on the housing to be adjusted. Then, the spring 194b pushes the locking pin 195b into the groove again, thereby adjusting and locking the relative tensioning position of the guide plate and the chain.

[0092] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form. Any technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A chainsaw, comprising: A motor; A front housing that supports the motor; An output device supported by the front housing, comprising: A guide bar detachably mounted to the front housing; A chain wound around the guide bar; A sprocket connected to the motor to drive the chain to move; Characterized in that the chainsaw further comprises: A chain tensioning assembly, comprising: A first limiting member storing a driving force for driving the guide bar to move away from the sprocket in a first direction; A second limiting member, when the guide bar is mounted to the front housing, the chain tensioning assembly has a first limiting state and a second limiting state. When the chain tensioning assembly is in the first limiting state, the first limiting member supports the guide bar. When the chain tensioning assembly is in the second limiting state, the first limiting member and the second limiting member jointly support the guide bar; The first limiting member is an elastic member. The first limiting member includes an abutting portion, and the abutting portion forms a limiting surface in the direction towards the guide bar. When the guide bar is mounted to the front housing, the limiting surface abuts against the side surface of the guide bar, and the limiting surface generates displacement in the first direction along with the elastic deformation of the first limiting member; when the chain tensioning assembly is in the first limiting state, in the first direction, the distance between the second limiting member and the guide bar is greater than the distance between the first limiting member and the guide bar; the second limiting member is disposed on both sides of the first limiting member, and the second limiting member is located between the guide bar and the sprocket.

2. The chainsaw according to claim 1, characterized in that: The chain tensioning assembly further comprises: a fixing member connecting the first limiting member and the front housing.

3. The chain saw according to claim 1, characterized in that: The elastic modulus of the second limiting member is less than the elastic modulus of the first limiting member.

4. The chainsaw according to claim 1, characterized in that: When the guide bar is mounted to the front housing, the first limiting member abuts against the guide bar, and the distance L2 between the second limiting member and the guide bar in the first direction is greater than or equal to 0.1 mm and less than or equal to 0.35 mm.

5. The chain saw according to claim 2, wherein: The first limiting member includes: a connecting portion connected to the front housing through the fixing member.

6. The chainsaw according to claim 2, wherein: The front housing further includes: a stopper disposed between the sprocket and the first limiting member; the first limiting member further includes a hook, and the hook is disposed away from the limiting surface, and the hook connects the stopper.

7. The chain saw according to claim 1, characterized in that: The guide bar further includes: a central hole extending along the first direction; the front housing further includes: a limiting pin, when the guide bar is mounted to the front housing, the limiting pin passes through the central hole.

8. The chain saw according to claim 1, characterized in that: The motor includes a rotor sleeve, a stator core, and a stator coil, and the diameter D1 of the rotor sleeve is less than or equal to 38 millimeters.

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