Power tool

A power tool includes a housing, a driving device, a cutting device and an oil storage device. The driving device, the cutting device and the oil storage device are all mounted in the housing. The driving device may drive the cutting device to work, and the oil storage device provides lubricating oil to the cutting device. The oil storage device includes an oil reservoir and an oil pump, the oil reservoir is connected with the oil pump through a first oil pipe, and a filtering structure is arranged between the first oil pipe and the oil reservoir to filter the lubricating oil entering the oil pump from the oil reservoir. The oil reservoir provides lubricating oil to the cutting device through the oil pump. The oil storage device of the disclosure may effectively improve a clogging problem of the oil pump and improve a duration life of the power tool.

TECHNICAL FIELD

The disclosure relates to a technical field of cutting tools, in particular to a power tool.

BACKGROUND

Power tools usually need lubricating oil to lubricate the cutting parts, but since there is a lot of dust in the cutting environment, impurities around the tool will fall into the oil reservoir, and the oil pump will easily cause blockage inside the oil pump after the impurities are sucked in, which results in the failure of the lubrication system of the power tool and affect the duration life of power tools.

SUMMARY

The disclosure provides a power tool to improve a problem of internal clogging of an oil pump of an oil storage device.

The disclosure provides a power tool, including a housing, a driving device, a cutting device and an oil storage device. The driving device is arranged in the housing. The cutting device is arranged in the housing and driven by the driving device. The oil storage device is arranged in the housing and used to provides lubricating oil to the cutting device. Wherein, the oil storage device includes an oil reservoir and an oil pump, the oil reservoir is connected with the oil pump through a first oil pipe, and a filtering structure is arranged between the first oil pipe and the oil reservoir to filter the lubricating oil entering the oil pump from the oil reservoir. The oil reservoir provides the lubricating oil to the cutting device through the oil pump.

In an embodiment of the disclosure, the oil reservoir is provided with an oil reservoir outlet connected with the first oil pipe, the filtering structure includes a claw, a first filter body and a filter spring, the claw is arranged on an end of the first oil pipe connected with the oil reservoir outlet, the claw is provided with a first oil inlet hole communicating with the first oil pipe, the first filter body is arranged on the in the claw, and the filter spring is sleeved on the claw and fixes the first filter body in the claw.

In an embodiment of the disclosure, the claw includes a pipe part, a claw plate and claw teeth connected sequentially, an outer diameter of the pipe part fits an inner diameter of the first oil pipe, a diameter of the claw plate is larger than an outer diameter of the first oil pipe, the claw plate is provided with the first oil inlet hole communicating with the pipe part, and the claw teeth are arranged at intervals along a circumferential direction of the claw plate to enclose an accommodating cavity of the first filter body.

In an embodiment of the disclosure, the first filter body is a filter sponge.

In an embodiment of the disclosure, the filter spring includes a cylindrical spring and a conical spring, the cylindrical spring is sleeved outside the claw, and the conical spring is blocked on an opening of the claw.

In an embodiment of the disclosure, a joint of the first oil pipe and the oil reservoir outlet is provided with a leak-proof structure, the leak-proof structure includes a cylindrical outer wall, a first flange and a second flange arranged on two sides of the cylindrical outer wall, the cylindrical outer wall fits on an outer wall of the first oil pipe and coupled with the oil reservoir outlet, the first flange is located inside the oil reservoir outlet, the second flange is located outside the oil reservoir outlet, and the first flange and the second flange are pressed tightly on surrounding walls of the oil reservoir outlet and seal the surrounding walls of the oil reservoir outlet.

In an embodiment of the disclosure, an outer side of the second flange is provided with a third flange connected with the second flange.

In an embodiment of the disclosure, a joint of the oil reservoir and the first oil pipe is provided with an oil nozzle protruding from a surface of the oil reservoir, the filtering structure includes a filter bracket and a second filter body, the second filter body is arranged in the filter bracket, and the filter bracket is arranged in the oil nozzle.

In an embodiment of the disclosure, the filter bracket includes a filter tube and a blocking part arranged at an end of the filter tube, the blocking part is provided with a through hole communicating with the filter tube, an outer diameter of the filter tube fits an inner diameter of the oil nozzle, and an outer diameter of the blocking part is larger than an outer diameter of the oil nozzle.

In an embodiment of the disclosure, a side wall of the filter tube is provided with a plurality of second oil inlet holes along a circumference, and the second filter body is distributed in the second oil inlet holes.

In an embodiment of the disclosure, the second filter body is a filter screen, and the filter bracket and the filter screen are integrally structured.

In an embodiment of the disclosure, an inner diameter of the first oil pipe fits an outer diameter of the oil nozzle, and the first oil pipe is tightly sleeved on the oil nozzle.

In an embodiment of the disclosure, the oil storage device further includes an oil reservoir cap, the oil reservoir cap includes a cover body, a cavity, a one-way venting structure and a pulling wire, the cover body is screwed to the oil reservoir inlet, and the cavity is arranged inside of the cover body and is concave toward the oil reservoir, a side of the cavity away from the oil reservoir is provided with an air inlet hole, a side of the cavity facing the oil reservoir is provided with an air outlet, the one-way venting structure is arranged in the cavity, a first end of the pulling wire is connected to the cover body on one side of the cavity, and a second end of the pulling wire extends into the oil reservoir to be connected with a blocking body that is capable of entering the oil reservoir.

In an embodiment of the disclosure, the one-way venting structure includes a one-way air intake valve and a third filter body, the one-way air intake valve is arranged in the cavity, and the third filter body is arranged in the air inlet hole to seal the air inlet hole.

In an embodiment of the disclosure, a blocking body is a tapered bracket capable of elastic deformation, and a size of a large end of the tapered bracket is larger than a diameter of an oil reservoir inlet.

In an embodiment of the disclosure, a mounting hole for pulling wire is provided in the cover body, and a circular concave cavity is arranged in the mounting hole. A sphere matching the circular concave cavity is provided at an end of the pulling wire, and the pulling wire is clamped in the circular concave cavity through the sphere.

In an embodiment of the disclosure, the third filter body is a copper powder sintered filter element.

In an embodiment of the disclosure, a sealing ring is further arranged in the cover body.

In an embodiment of the disclosure, the driving device includes a driving motor, and the driving motor is a brushed motor or a brushless motor.

In an embodiment of the disclosure, the housing includes a first housing, a second housing and a motor supporting pad, an interior of the first housing is provided with a plurality of first supporting ribs, positions of an interior of the second housing corresponding to the first supporting ribs are provided with a plurality of second supporting ribs, after the first housing is fastened with the second housing, the first supporting ribs and the second supporting ribs enclose to form a motor accommodating cavity that matches a brushed motor, the motor supporting pad is detachably arranged on the first supporting rib and the second supporting rib, and an inner diameter of the motor supporting pad fits a size of a brushless motor.

In an embodiment of the disclosure, a side surface of the motor supporting pad in contact with the first supporting ribs and the second supporting ribs is provided with a washer groove to accommodate the supporting ribs, and the side surface of the motor supporting pad in contact with the brushless motor is provided with an arc-shaped matching surface matched with the brushless motor.

In an embodiment of the disclosure, the motor supporting pad includes a first rubber pad mounted on the first supporting rib and a second rubber pad mounted on the second supporting rib, and the first rubber pad and the second rubber pad are mounted correspondingly.

In an embodiment of the disclosure, a clamping groove for accommodating a housing supporting pillar of the brushless motor is arranged on a side of the motor supporting pad away from the first supporting rib and the second supporting rib.

In an embodiment of the disclosure, the motor accommodating cavity includes a first cavity accommodating a head of the motor, a second cavity accommodating a main body of the motor and a third cavity accommodating an output end of the motor.

In an embodiment of the disclosure, both the first housing and the second housing are provided with windshields corresponding to the motor accommodating cavity.

In an embodiment of the disclosure, the motor supporting pad is detachably mounted on supporting ribs in the second cavity, and the motor supporting pad separates the windshield located in the first cavity from the windshield located in the third cavity.

The oil storage device of the power tool of the disclosure may effectively filter large particles of impurities in the lubricating oil entering the oil pump from the oil reservoir through mounting the filtering structure between the first oil pipe and the oil reservoir, thereby improving the clogging problem of the oil pump. The disclosure provides two different filtering structures, one is mounted at the end of the first oil pipe, and the impurities in the lubricating oil are filtered out by a double filter of the filter body and the filter spring, which avoids the clogging of the oil pump and enables it to effectively lubricate a saw chain. The other includes a filter bracket and a filter screen. A specification of the filter screen may be selected according to a working environment of the tool and an oil filter hole inside the oil pump. This filtering structure is small in size and may be used in small oil reservoirs and irregular blowing molding oil reservoirs with oil nozzles, which may efficiently filter large particles in lubricating oil, avoid clogging the oil pump, and improve a duration life of power tools.

The oil storage device of the power tool of the disclosure further improves a structure of the oil reservoir cap. The cavity is arranged inside the cover body. A side of the cavity facing away from the oil reservoir is provided with the air inlet holes, and the side of the cavity facing the oil reservoir is provided with the air outlet holes. Air entering from the air inlet holes can only enter the oil reservoir through the air outlet holes of the cavity, and an area outside the cavity is a sealed structure to increase a sealing of the oil reservoir. In addition, the one-way venting structure is arranged in the cavity, which may allow outside air to enter the cavity, but can prevent liquid in the oil reservoir from overflowing from the one-way venting structure. It can not only replenish the air in time during a suction process of the suction device, but also prevent the oil in the oil reservoir from overflowing to cause loss and leakage pollution. An inside of the oil reservoir cap is provided with an anti-loss pulling wire, and the pulling wire and the cavity are arranged at different positions, which prevents the oil from overflowing from where the pulling wire is mounted.

A detachable motor supporting pad is arranged in the housing of the power tool of the disclosure, so that a same housing system may be compatible with brushed motors and brushless motors, and users may choose to mount the brushed motor or brushless motor according to individual needs. Moreover, the motor supporting pad separates the air inlet at a front end of the brushless motor from fan blades at a rear end of the brushless motor, so as to avoid affecting a heat dissipation of the motor due to turbulent wind and scattered wind, and improve effective working time of the motor.

PART NUMBER DESCRIPTION

DETAILED DESCRIPTION

The following describes the implementation of the disclosure through specific embodiments, and those skilled in the art may 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.

Please refer toFIG.1throughFIG.31. The disclosure provides a power tool, used to improve a clogging problem of an oil pump in an oil storage device.

Please refer toFIG.1andFIG.2. The power tool of the disclosure includes a housing1, a driving device, a cutting device4and an oil storage device6, wherein, the driving device, cutting device4and oil storage device6are mounted in the housing1. The driving device includes a driving motor2and a transmission device3. The driving motor2may be a brushed motor or a brushless motor. The transmission device3may transmit power of the driving motor2to the cutting device4. The oil storage device6is arranged on a side of the housing1close to the cutting device4to provide lubricating oil to the cutting device4for lubrication and cooling.

Please refer toFIG.3andFIG.6. The oil storage device6includes an oil reservoir600and an oil pump620. The oil reservoir600is connected with the oil pump620through a first oil pipe630. A filtering structure is arranged between the first oil pipe630and the oil reservoir600for filtering large particles of impurities in lubricating oil entering the oil pump620from the oil reservoir600to prevent large particles of impurities from clogging the oil pump. Specifically, the oil reservoir600is provided with an oil reservoir outlet601and an oil reservoir inlet602. For example, the oil reservoir outlet601is arranged at a bottom of the oiler600, the oil inlet of the oil reservoir inlet602is arranged at an upper part of the oil reservoir, and the oil inlet of the oil reservoir inlet602is provided with an oil reservoir cap610. A first end of the first oil pipe630is connected with the oil reservoir outlet601, and a second end is connected with an oil suction port of the oil pump620. A first end of the second oil pipe640is connected with an oil discharge port of the oil pump620, and a second end of the second oil pipe640extends to a part of the cutting device4to be lubricated. The oil pump620may be a plunger pump, and a suction of the plunger pump is controlled by an oil pump cam6201arranged on a sprocket driving shaft300(seeFIG.26).

Please refer toFIG.3throughFIG.5. In one embodiment, the filtering structure is arranged at an end where the first oil pipe630is connected with the oil reservoir outlet601of the oil reservoir, which is marked as a first filtering structure650. The first filtering structure650includes a claw6501, a first filter body6502and a filter spring6503, the claw6501is mounted at an end of the first oil pipe630, the claw6501is provided with an oil inlet hole communicating with the first oil pipe630, the first filter body6502is mounted in the claw6501, and the filter spring6503is sleeved on the claw6501and fixes the first filter body6502in the claw6501.

Please refer toFIG.5,FIG.7andFIG.8. As an example, the claw6501includes a pipe part65011, a claw plate65012connected with the pipe part65011, and claw teeth65013arranged on a side of the claw plate65012away from the pipe part65011. The claw plate65012is provided with the oil inlet hole connected with the pipe part65011. An outer diameter of the pipe part65011matches a diameter of an end of the first oil pipe630. The first oil pipe630is a rubber oil pipe. Through using an elasticity of rubber material, the pipe part65011is inserted into the first oil pipe630and tightens the first oil pipe630. After the pipe part65011is inserted into the first oil pipe630, the claw plate65012stops at the first oil pipe630. The claw teeth65013are arranged at intervals along a circumference of the claw plate65012, the claw teeth65013enclose to form an accommodating cavity of the first filter body6502, and the first filter body6502fills the accommodating cavity surrounded by claw teeth65013. In some embodiments, the claw teeth65013are substantially in a shape of a triangular prism, and one of side edges of the triangular prism faces the first filter body6502. In order to prevent the first filter body6502from being scratched by the edge of the triangular prism, a side edge of the triangular prism facing the filter body may be cut into a plane and rounded. A circular groove matching a diameter of the first filter body6502is arranged on a side of the claw plate65012facing the first filter body6502. The first filter body6502is clamped inside the circular groove. The first filter body6502may be a filter sponge or other filter bodies with filter performance.

Please refer toFIG.4,FIG.5andFIG.9. As an example, the filter spring6503includes a cylindrical spring65031and a conical spring65032. The conical spring65032is arranged at one end of the cylindrical spring65031and connected with it as a whole. The cylindrical spring65031is sleeved outside the claw6501, and holds the filter body6502in the claw6501tightly, and the conical spring65032blocks an opening of the claw6501to prevent the first filter body6502from falling off from the claw6501. Gaps between steel wires of the filter spring6503may also play a layer of oil filtering effect, so as to realize a double filtration of the filter structure, so that the lubricating oil entering the oil pump620does not contain large particles of dirt and impurities, and can lubricate the cutting device for a long time.

Please refer toFIG.3,FIG.6andFIG.10. As an example, the oil reservoir outlet601is a circular hole, a first end of the first oil pipe630mounted with the first filtering structure650is inserted into the circular hole, and a second end of the first oil pipe630is connected with the oil suction port of the oil pump620. In order to prevent oil leakage at a connection between the first oil pipe630and the oil reservoir outlet601, a leak-proof structure6301is arranged at the connection between the first oil pipe630and the oil reservoir outlet601. The leak-proof structure6301is elastic, and may be bonded to the first oil pipe630, or integrally formed with the first oil pipe630. The leak-proof structure6301includes a cylindrical outer wall63011matched with the oil reservoir outlet601, and a first flange63012and a second flange63013respectively arranged at both ends of the cylindrical outer wall63011. The cylindrical outer wall63011is interference-fit to the oil reservoir outlet601to form a radial sealing structure. The first flange63012is located inside the oil reservoir outlet601, and the second flange is located outside the oil reservoir outlet601. The first flange63012and the second flange63013rely on its own elastic force to press tightly on surrounding walls of the oil reservoir outlet601to form an end face sealing structure and seal the surrounding walls of the oil reservoir outlet. In some embodiments, an outer side of the second flange63013is further provided with a third flange63014connected thereto, which serves to strengthen a seal. A first end of the second oil pipe640is connected with the oil discharge port of the oil pump620, and a second end of the second oil pipe640extends to a part of the cutting device4to be lubricated or cooled.

Please refer toFIG.11throughFIG.13. In another embodiment, the filtering structure may also be arranged in the oil reservoir outlet601, which is marked as a second filtering structure660. In this embodiment, the oil reservoir outlet601is provided with an oil nozzle6601protruding from the oil reservoir outlet601. The second filtering structure660is arranged in the oil nozzle6601. The second filtering structure660includes a filter bracket6602and a second filter body (not shown in the figure) arranged in the filter bracket6602. The filter bracket6602is interference-inserted into the oil nozzle6601, an end of the first oil pipe630is sleeved on the oil nozzle6601, and the filter bracket is pressed into the oil nozzle6601tightly. The filter bracket6602includes a filter tube66021and a blocking part66022arranged at an end of the filter tube66021. The blocking part66022is provided with a through hole66024that communicates with the filter tube66021. The blocking part66022is blocked on the oil nozzle6601. A surface of the blocking part66022that fits the oil nozzle6601is provided with a matching surface that matches the oil nozzle6601. In some embodiment, one end of the blocking part66022away from the filter tube66021is provided with a conical surface, which is marked as a first conical surface66025, to facilitate a mounting of the first oil pipe630. Multiple oil inlet holes66023are arranged on a side wall of the filter tube66021. In some embodiment, an oil inlet hole66023is a rectangular through hole. The multiple rectangular through holes are evenly distributed along a circumference of the filter bracket6602. The rectangular through holes may increase a filtering area. The second filter body may be a filter sponge or a filter screen covering the rectangular through hole. For example, it may be a nylon filter screen. The nylon filter screen covers the rectangular through hole to filter the lubricating oil entering the oil pump620. Specifications of the filter screen may be determined according to a working environment and an oil filter hole inside the oil pump620, so as to achieve efficient filtering of large particle impurities in the lubricating oil and prevent the oil pump620from clogging. The filter bracket6602may also be a nylon bracket, and the nylon filter screen and the nylon bracket are integrally injection molded.

Please refer toFIG.6andFIG.12. As an example, the oil reservoir outlet601is a circular hole, and the oil nozzle6601is a cylindrical tube body that matches the circular hole. A connection joint of the oil nozzle6601and the oil reservoir outlet601is provided with a flange fully matched a casing of the oil reservoir, which may prevent oil leakage at the oil nozzle6601. In other embodiments, the oil nozzle6601and the oil reservoir outlet601may also be an integrated structure. In some embodiments, an end of the oil nozzle6601away from the oil reservoir outlet601is provided with an inwardly contracting conical surface, which is marked as a second conical surface66011. A design of the conical surface is conducive to guiding the first oil pipe630to be easily sleeved and mounted on the oil nozzle6601.

Please refer toFIG.12andFIG.14. In this embodiment, the first oil pipe630is made of rubber material, and an inner diameter of an end of the first oil pipe630connected with the oil nozzle6601fits an outer diameter of the oil nozzle6601. During mounting, the first oil pipe630is sleeved on the oil nozzle6601, with an elasticity of the rubber material, the oil nozzle6601tightens the first oil pipe630, and then ties a tie around an outside of the first oil pipe630, which may effectively prevent oil leakage between the oil nozzle6601and the first oil pipe630, and also prevent the first oil pipe630from falling off the oil nozzle6601during use. This filtering structure has a small overall volume and may be used in small oil reservoirs or irregular blow molded oil reservoirs with oil nozzles.

Please refer toFIG.15throughFIG.19. In one embodiment, the oil reservoir cap610includes a cover body611, a cavity612arranged in the cover body611, and a one-way venting structure613arranged in the cavity612. An inner wall of the cover body611is provided with a thread structure6111matches an external thread of the oil reservoir inlet602. The cavity612is arranged inside the cover body611and is concave toward the oil reservoir600. A side of the cavity612away from the oil reservoir600is provided with an air inlet6112that communicates with an outside, and a side of the cavity612facing the oil reservoir600is provided with an air outlet6121. A diameter of the air outlet6121is smaller than a diameter of the air inlet6112. Only a small amount of lubricating oil may pass through the air outlet6121. The one-way venting structure613is arranged inside cavity612. The one-way venting structure613allows air to enter the oil reservoir600from the outside, but can prevent liquid in the oil reservoir600from overflowing from the one-way venting structure. It can not only replenish air in time during a suction process of the oil pump620, but also prevent the liquid in the oil reservoir600from overflowing, thereby causing losses and leakage pollution.

Please refer toFIG.15. In one example, anti-skid protrusions6113are arranged on an outer wall of the cover body611. The anti-skid protrusions6113are arranged at intervals along a circumferential direction of the cover body611. When force is required, the anti-skid protrusions6113may increase a certain amount of friction. For example, the anti-skid protrusion6113is a hat-shaped structure, with crowns arranged at intervals and brims connected together to form a circle of patterns, which has a certain aesthetic effect.

Please refer toFIG.15andFIG.17. In one embodiment, one end of the cover body611facing the oil reservoir600is provided with an inwardly contracting conical surface, marked as a third conical surface6114, and a matching surface6115that matches the oil reservoir600. The matching surface6115may completely fit the oil reservoir600. A conical surface design may prevent oil leakage in the oil reservoir600.

Please refer toFIG.16andFIG.17. In one embodiment, the one-way venting structure613includes a one-way air intake valve6131, and an air intake slit61311is arranged at an end of the one-way air intake valve6131toward the air inlet hole6112. The one-way air intake valve6131allows the air to enter from the outside of the oil reservoir cap610to an inside of the oil reservoir600, but does not allow the liquid in the oil reservoir600to overflow. The one-way air intake valve6131is a rubber component with a certain degree of elasticity and a one-way venting function that may allow air to pass into the oil reservoir600, but can not leak oil to the outside. A filter body for filtering the air is mounted on one end of the one-way air intake valve6131facing the air inlet hole6112, which is marked as a third filter body6132. The third filter body6132may be a copper powder sintered filter element or a filter element made of other venting materials such as PE, which is a venting filter element of 20 to 100 mesh, preferably a venting filter element of 60-80 mesh with a function of dust filtration protection and can be mounted and pressed on an upper part of the one-way air intake valve6131to block the air inlet6112. When the oil pump620needs to absorb oil, an internal pressure of the oil reservoir600changes, and the air will pass through the third filter body6132, then enter the one-way air intake valve6131through the air intake slit61311of the one-way air intake valve, and then enter the inside of the oil reservoir600through the air outlet6121at a bottom of the cavity612. When a handheld cutting tool is placed sideways or upside down, the lubricating oil inside the oil reservoir600will enter the oil reservoir cap610. Since the air outlet6121on the cavity612has a small area, only a small part of the oil can pass through, and the one-way air intake valve6131is reversely sealed, so it is difficult for oil to penetrate the copper powder filter element, thereby achieving a sealing of the oil reservoir cap610and preventing oil from overflowing from the oil reservoir cap610.

Please refer toFIG.16andFIG.19. In one embodiment, an inside of the cover body611is further provided with a sealing ring614, which is preferably made of elastic silicone material, which may be in a form of a conventional circular gasket. In this embodiment, an annular groove6141is arranged at an end of the cover body611close to the air inlet6112. With an elasticity of the silicone material, an inside of annular groove6141may be filled by the sealing ring614, so that there is a larger sealing surface between the cover body611and the oil reservoir inlet602.

Please refer toFIG.15throughFIG.17andFIG.19. The cover body611is further provided with a pulling wire615to prevent the cover body611from being lost. A first end of the pulling wire615is mounted in the cover body611. A second end of the pulling wire615extends to the inside of the oil reservoir600and is connected with a blocking body616that may enter the inside of the oil reservoir600. The pulling wire615is mounted at a different position from the cavity612to prevent the oil in the oil reservoir600from leaking from a mounting position of the pulling wire615. A connection method between the pulling wire615and the cover body611is not limited and may be any suitable connection means.

Please refer toFIG.16,FIG.17andFIG.19. In one embodiment, a mounting hole6151of the pulling wire615is arranged inside the cover body611. The mounting hole6151is located on one side of the cavity612. The pulling wire615is provided with a mounting structure coupled with the mounting hole6151at one end of the cover body611and the mounting structure is threaded or interference inserted into the mounting hole6151. In some embodiments, a circular concave cavity6152is arranged in the mounting hole6151. One end of the mounting hole6151facing the pulling wire615is provided with an opening groove6153for increasing an elasticity of a wall of the mounting hole6151. The first end of the pulling wire615is provided with a sphere6154matching the circular concave cavity6152, the sphere6154and the pulling wire615are integrally formed by injection molding, and the sphere6154is clamped into the circular concave cavity6152. This arrangement allows the pulling wire615to rotate at any angle, which is not only flexible in rotation, but also can prevent the first end of the pulling wire615from falling off or getting entangled due to the rotation.

Please refer toFIG.6andFIG.15. In one embodiment, the blocking body616is an elastically deformable bracket. The bracket is integrally formed with the pulling wire615and may enter the oil reservoir600from the oil reservoir inlet602along a longitudinal direction of the blocking body616. After entering the oil reservoir600, it may no longer be pulled out from the oil reservoir inlet602without external force. For example, the blocking body616has an “A”-shaped tapered structure, and the pulling wire615is connected with a tip of the “A”-shaped shape. A size of an opening end of the “A”-shaped shape is larger than a diameter of the oil reservoir inlet602. Using this structure of the blocking body616is conducive to an elastic compression deformation of the blocking body616when it is taken out, so as to be taken out from the oil reservoir inlet602. In other embodiments, the blocking body616may also be a blocking rod (not shown in the figure). The pulling wire615is connected with a center of the blocking rod. The blocking rod may enter the oil reservoir inlet602along an axial direction, and is blocked by the oil reservoir inlet602when it is lifted. A diameter of the blocking rod is smaller than the diameter of the oil reservoir inlet602, and may enter an inner cavity of the oil reservoir600from the oil reservoir inlet602. A length of the blocking rod is greater than the diameter of the oil reservoir inlet602and smaller than a minimum width of the inner cavity of the oil reservoir600. When the pulling wire615is pulled, the blocking rod is laterally blocked on the oil reservoir inlet602under dual effects of the pulling wire615and gravity.

Please refer toFIG.1,FIG.2andFIG.20throughFIG.22. A housing system of the disclosure may be used to mount either a brushed motor or a brushless motor, which solves a problem that a brushed motor and a brushless motor may not be compatible in one housing system. The housing1of the disclosure includes a first housing100and a second housing110. A plurality of first supporting ribs101are arranged inside the first housing100. A plurality of second supporting ribs111are arranged at a position of an interior of the second housing110corresponding to the first supporting ribs101in the first housing100. After the first housing100and the second housing110are buckled together, the first supporting ribs101and the second supporting ribs111surround to form a motor accommodating cavity120that matches the brushed motor. The housing1further includes a motor supporting pad130. The motor supporting pad130is detachably mounted on the first supporting ribs101and the second supporting ribs111, and an inner diameter of the motor supporting pad130fits a size of the brushless motor.

Please refer toFIG.2,FIG.21andFIG.22. The first supporting ribs101and the first housing100are of an integrated structure. The second supporting ribs111and the second housing110are of an integrated structure. Side of the first supporting ribs101and the second supporting ribs111facing the motor accommodating cavity120are provided with arc-shaped matching surfaces matched with the brushed motor21. The first supporting ribs101and the second supporting ribs111divide the motor accommodating cavity120into a first cavity121, a second cavity122and a third cavity123. When the driving motor2is mounted, a head of the driving motor2is located at the first cavity121. A main body of the driving motor2is located in the second cavity122, and an output end of the driving motor2is located in the third cavity123.

Please refer toFIG.21throughFIG.23. In one embodiment, the first housing100and the second housing110are both provided with windshields140corresponding to the motor accommodating cavity120, and air inlets at front and rear ends of the driving motor2are located at the windshields140of the housing, so that a heat dissipation effect of the driving motor2is better and the driving motor2may be ensured to work for a long time.

Please refer toFIG.21throughFIG.25andFIG.27. The motor supporting pad130is a rubber blocking ring, which includes a first rubber pad131arranged on the first supporting ribs101and a second rubber pad132arranged on the second supporting ribs111. The first rubber pad131and the second rubber pad132are mounted opposite each other. A side of the motor supporting pad130in contact with the first supporting ribs101and the second supporting ribs111is provided with a washer groove133for accommodating the supporting ribs. A side of the motor supporting pad130in contact with the brushless motor22is provided with an arc-shaped washer matching surface134that matches the brushless motor22. In addition, the arc-shaped washer matching surface134is further provided with a clamping groove135for accommodating housing supporting pillars of the brushless motor22. After the motor supporting pad130is mounted on the first supporting ribs101and the second supporting ribs111, the brushless motor22and the motor supporting pad130may be completely fitted. In some embodiments, the motor supporting pad130is arranged on the supporting ribs in the second cavity122. At this time, the motor supporting pad130is located on a main body of the brushless motor22, so that the motor supporting pad130may block windshields at the first cavity121from windshields at the third cavity123. An air inlet at front end of the brushless motor22and a heat dissipation of a fan blades at rear end may be effectively separated to avoid random wind and wind dissipation, which will affect an effective heat dissipation of the motor. In addition, the motor supporting pad130is made of rubber, which also has an effect of absorbing shock and isolating noise.

Please refer toFIG.25andFIG.27. It should be noted that a number of the motor supporting pads130in the disclosure may be one or more, specifically to support the motor stably. Considering that an output flange of the driving motor2in conventional cutting tools is usually fixed on the housing through a motor bracket, and too many motor supporting pads130will enable an assembly to be more difficult, in this embodiment, there is only one motor supporting pad130, and the motor supporting pad130is clamped on the first supporting ribs101and the second supporting ribs111through the washer groove133. The brushless motor22is mounted in the motor supporting pad130, and the output flange of the motor is mounted in the housing1through a motor bracket23. The motor bracket23is clamped in a groove surrounded by supporting ribs inside the third cavity123. The motor bracket23may provide support for a rotation of the output shaft of the driving motor2and a sprocket driving shaft300.

Please refer toFIG.2,FIG.21,FIG.25,FIG.26andFIG.28. The housing1is further provided with a transmission device accommodating cavity150and an oil storage device accommodating cavity160. The transmission device3is connected with an output end of the driving motor2. Therefore, the transmission device accommodating cavity150is arranged on one side of the output end of the driving motor2. The oil storage device accommodating cavity160is arranged on a side of the transmission device accommodating cavity150away from the driving motor2and is used for mounting the oil storage device6. The transmission device accommodating cavity150includes a circular housing arranged on the first housing100, and a size of the circular housing should be larger than a size of the transmission device3at its maximum position. The transmission device3includes a driving bevel gear320, a driven bevel gear310, the sprocket driving shaft300and a sprocket330. The driving bevel gear320is mounted on the output shaft of the driving motor2, and the driven bevel gear310is rotatably mounted in the circular housing of the transmission device accommodating cavity150and meshes with the driving bevel gear320. The sprocket driving shaft300is arranged in a direction perpendicular to the driven bevel gear310. A first end of the sprocket driving shaft300is rotatably connected with the motor bracket23, and a second end of the sprocket driving shaft300is sequentially mounted with the sprocket330, the driven bevel gear310, and an oil pump cam6201along its axial direction. The cutting device4is mounted on the housing1and driven by the sprocket330. The driving motor2is started, the output shaft of the motor drives the driving bevel gear320to rotate, the driving bevel gear320drives the driven bevel gear310to rotate, then drives the sprocket driving shaft300to rotate, and the sprocket driving shaft300drives the sprocket330to rotate. The cutting device4completes the cutting action driven by the sprocket330. At the same time, the oil pump cam6201rotates with the sprocket driving shaft300. Since a plunger of the plunger pump is against an edge of the oil pump cam6201, as the oil pump cam6201rotates, the plunger pump completes a suction action and provides lubricating oil to the cutting device4.

Please refer toFIG.29throughFIG.31. In one example, the cutting device4includes a saw chain400and a guide bar410that guides the saw chain400. One end of the saw chain400is mounted on the sprocket330. The guide bar410is fixed on the housing1through a bar plate pad420and bolts. A guiding groove411is arranged on an outer circumference of the guide bar410, and the saw chain400is clamped in the guiding groove411of the guide bar410. The saw chain400includes a tie strap401, a drive link402and a cutter403. The cutter403is detachably fixed on an outside of the tie strap401, and the drive links402are detachably fixed on an inside of the tie strap401. The drive links402are all matched, clamped and connected with the guiding groove411. The saw chain400is driven by the sprocket303to continuously rotate around a circumference of the guide bar410. The drive link402of the saw chain400are clamped and connected in the guiding groove411of the guide bar410to ensure that the saw chain400does not separate from the guide bar410.

Please refer toFIG.1,FIG.2andFIG.22. The power tool of the disclosure further includes a connecting rod5and a power cable (not shown in the figure). A first end of the connecting rod5is mounted in the housing1, and a second end is provided with a control handle. The power cable is arranged inside the connecting rod5and is connected with driving motor2. The housing1is provided with a connecting rod accommodating cavity170. The connecting rod accommodating cavity170is arranged at one end of the housing1away from the cutting device4. The connecting rod5is inserted into the connecting rod accommodating cavity170and is fixed with screws and a fastening lock. The connecting rod5may be a telescopic rod. Through adjusting a length of the telescopic rod, it may be extended to a high place to cut tree trunks or branches.

It should be noted that the parts of the power tool of the disclosure that are not described in detail may be implemented by structures in the conventional art, and will not be described again here.

In summary, the oil storage device of the power tool of the disclosure is provided with the filtering structure at the joint of the oil pump and the first oil pipe. Through the filtering structure, large impurities in the lubricating oil may be filtered out, thereby avoiding the clogging of the oil pump and enabling it to effectively lubricate the saw chain. The power tool adopting the oil storage device of the disclosure can increase the duration life of the tool.

The above-mentioned embodiments merely illustrate the principles and effects of the disclosure, but are not intended to limit the disclosure. Anyone skilled in the art may modify or change the above embodiments without departing from the range of the disclosure. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the range and technic disclosed in the disclosure should still be covered by the claims of the disclosure.