A foldable lithium electric saw

Abstract

The application provides a foldable lithium electric saw, which comprises a driving device, a cutter assembly, a first supporting device, a second supporting device and an adjusting mechanism. The driving device provides power for the cutter assembly through a driving shaft. The cutter assembly comprises a chain, a chain wheel and a chain guide plate, and the chain wheel and the chain guide plate support the chain in cooperation. The driving device is installed on a first mounting part, and the driving shaft is arranged perpendicularly to the extension direction of the first supporting device. The second supporting device is adapted to slideably support the chain guide plate, and the second supporting device is adapted to rotate relative to the first mounting part around the driving shaft. The chain guide plate and the chain rotate synchronously with the second supporting device, so that the cutter assembly is switched between an initial state and a folded state. The adjusting mechanism is adapted to adjust the tension of the chain by driving the chain guide plate to approach / leave the chain wheel along the length direction of the chain guide plate. The application realizes the switching from the initial state to the folded state through the second supporting device, the overall size of the electric saw is reduced, and the user can conveniently carry the electric saw to various work sites.

Description

Technical Field

[0001] This invention belongs to the field of chainsaw technology, and particularly relates to a foldable lithium chainsaw. Background Technology

[0002] In modern forestry, landscaping maintenance, and outdoor operations, chainsaws are used extensively as highly efficient cutting tools. Lithium-ion chainsaws are gaining popularity due to their advantages such as no power cord and flexible operation. However, existing lithium-ion chainsaws still have room for improvement in terms of portability and blade angle adjustment, especially for those who need to work in the field for extended periods or frequently switch between different locations. How to further enhance the portability and flexibility of chainsaws while maintaining performance is a pressing issue for the industry. While existing folding chainsaws can be partially folded, they often suffer from poor structural stability and loose joints. Furthermore, the chain tension adjustment of existing lithium-ion chainsaws typically uses a bolt-push structure, which is cumbersome to operate and prone to backtracking. In addition, the lubrication system of the blade assembly often relies on manual oiling, making maintenance inconvenient. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this invention is to provide a foldable lithium chainsaw to meet the needs of users.

[0004] To achieve the above objectives, the present invention provides a foldable lithium-ion chainsaw, comprising:

[0005] A drive unit, which includes a drive shaft;

[0006] A cutting tool assembly includes a chain, a sprocket, and a chain guide plate. The sprocket is driven to the drive shaft, and the sprocket is fixed relative to the drive shaft. The sprocket and the chain guide plate cooperate to support the chain, and the sprocket meshes with the chain.

[0007] A first support device includes a gripping part and a first mounting part disposed at one end of the gripping part, a drive device is mounted on the first mounting part, and a drive shaft is disposed perpendicular to the extending direction of the first support device.

[0008] A second support device is adapted to slidably support the chain guide plate. The second support device is adapted to rotate about the drive shaft relative to the first mounting portion. The chain guide plate and the chain rotate synchronously with the second support device to switch the tool assembly between an initial state and a folded state.

[0009] An adjustment mechanism adapted to adjust the tension of the chain by driving the chain guide plate to approach / move away from the sprocket along its length;

[0010] A lithium battery, which powers the drive device, is mounted at the other end of the grip.

[0011] In the initial state, the chain guide plate extends outward toward the first mounting portion in a direction parallel to the extension direction of the first support device; in the folded state, the chain guide plate extends outward toward the first mounting portion in a direction parallel to the extension direction of the first support device, and the chain guide plate extends outward toward the first mounting portion. The cutter assembly rotates 180° from the initial state to the folded state.

[0012] Preferably, in the folded state, the overall size of the chainsaw is greatly reduced, and the overall length h2 after folding is shortened to 50%-60% of the overall length h1 in the initial state.

[0013] Preferably, the second support device includes a rotating guide plate and a cover plate, the rotating guide plate and the cover plate being adapted to be assembled along the direction of the drive shaft and defining a second cavity, the second cavity including an outlet, the sprocket being mounted in the second cavity, the drive shaft being adapted to extend into the second cavity and connect to the sprocket, and the chain guide plate extending out of the second cavity through the outlet.

[0014] Preferably, the first mounting portion defines a first cavity, and at least a portion of the driving device is disposed in the first cavity.

[0015] Preferably, the outlet is equipped with comb teeth to automatically clean wood chips and branches tangled on the chain.

[0016] Preferably, the first mounting part includes a first rotating surface, the rotating guide plate includes a second rotating surface and a third rotating surface arranged opposite to each other, the second rotating surface is arranged facing the first rotating surface, the third rotating surface is provided with a guide rail, the chain guide plate includes a guide groove arranged along its length direction, the guide rail and the guide groove reciprocate to slide and cooperate, eliminating deflection error during adjustment.

[0017] Preferably, the adjustment mechanism includes an adjustment knob and a cam assembly. The cam assembly includes a disc-mounted cam and a follower that are connected in a transmission manner. The follower is connected to the chain guide plate, and the disc-mounted cam is connected to the adjustment knob. The adjustment knob drives the disc-mounted cam to rotate, which in turn drives the chain guide plate to move closer to / away from the sprocket through the follower.

[0018] Preferably, the driven member includes an integral driven plate and a driven protrusion. The disc-mounted cam, the driven plate, and the chain guide are parallel to each other. The driven plate is connected to the chain guide. The driven protrusion includes a driven plane, which is perpendicular to the length direction of the chain guide. The outer contour of the disc-mounted cam contacts the driven plane. When the disc-mounted cam rotates, the force between the disc-mounted cam and the driven member is set along the length direction of the chain guide.

[0019] Preferably, the rotating guide plate and the cover plate are detachably connected by a bolt structure for easy disassembly and maintenance. The bolt structure includes a T-screw, a nut, and a tightening knob. The T-screw is mounted on the rotating guide plate, and the tightening knob is fixedly connected to the nut. The tightening knob is located on the outside of the cover plate, and the nut extends into the second cavity and is threadedly connected to the threaded connection. The T-screw is positioned along the drive shaft direction.

[0020] Furthermore, the adjusting knob is located on the outside of the cover plate, and the adjusting knob and the tightening knob are coaxially arranged. The tightening knob, together with the cover plate, provides axial restraint for the adjusting knob, and the nut is adapted to pass through the adjusting knob and provide radial restraint for it.

[0021] Preferably, the foldable lithium-ion electric saw includes a locking mechanism adapted to restrict rotation of the second support mechanism relative to the first support mechanism, the locking mechanism comprising:

[0022] At least one locking groove, the locking groove extending inward perpendicular to the first rotational surface;

[0023] A locking pin, which is telescopically mounted on the second support device, is arranged parallel to the drive shaft direction.

[0024] A locking knob adapted to drive the locking pin to engage or disengage from the locking slot to achieve locking / unlocking, wherein the tool assembly is in an initial state when the locking pin is engaged with one of the locking slots;

[0025] A return spring is provided, which is adapted to drive the locking pin to remain out of the locking slot to maintain the unlocked state.

[0026] Preferably, the locking pin includes a first stop portion protruding radially therefrom, the second support mechanism forms an unlocking groove, a second stop ring is provided in the unlocking groove, the first stop portion abuts against the second stop ring to restrict the locking pin from disengaging from the unlocking groove, the two ends of the return spring abut against the second stop ring and the locking knob, and the return spring drives the locking pin to remain fully contained in the unlocking groove.

[0027] Preferably, the first rotating surface has a protruding rotating shaft portion, the rotating guide plate has a bushing portion, the bushing portion is sleeved on the rotating shaft portion, and a clamping member is disposed on the third rotating surface. The clamping member is connected to the rotating shaft portion and provides axial positioning for the rotating guide plate. The clamping member includes an annular clamping plate, the inner ring portion of the clamping plate is connected to the rotating shaft portion by a plurality of screws, and the outer ring portion of the clamping plate contacts the rotating sleeve portion.

[0028] Preferably, the third rotating surface includes a fan-shaped limiting portion surrounding the bushing portion, the fan-shaped limiting portion including a plurality of circumferentially distributed limiting grooves, the clamping member including limiting claws extending outward from the clamping plate, and when the second support device rotates, the limiting claws can be engaged one by one with the limiting grooves.

[0029] Preferably, the clamping member further includes a positioning block, which forms a positioning groove with the clamping plate. The rotating guide plate includes a boss disposed on the third rotating surface, and the slide rail protrudes from the boss. The boss includes a positioning protrusion. When the positioning protrusion is inserted into the positioning groove, the tool assembly is in its initial state, and the second support device can only rotate in one direction.

[0030] Preferably, the arc of the fan-shaped limiting part is π / 2, and the second rotating mechanism rotates 10°-20° each time the limiting claw switches to engage with the limiting groove.

[0031] Preferably, the limiting claw includes a cantilever portion extending radially outward along one of the clamping plates and a claw portion disposed at the free end of the cantilever portion, the claw portion having a V-shaped structure.

[0032] Preferably, the first rotating surface includes a plurality of indicators, and the cover plate includes an indicator arrow, which can be selectively aligned with one of the indicators to indicate the rotation angle. The locking grooves correspond one-to-one with the indicators, and each locking groove and its corresponding indicator are centrally symmetrical about the center of the sprocket. Users can intuitively understand the folding angle and status of the device, making operation more intuitive and convenient.

[0033] Preferably, the angle between two adjacent indicators is N times the angle between two adjacent limiting grooves, where N is a natural number not greater than 18.

[0034] Preferably, the first rotating surface is provided with an oil injection hole, and the rotating guide plate includes an oil guide groove disposed on the second rotating surface, an oil storage groove disposed on the third rotating surface, and an oil guide hole connecting the oil guide groove and the oil storage groove. The oil guide groove is disposed towards the first rotating surface, and a first sealing ring and a second sealing ring are respectively disposed radially inside and outside the oil guide groove. The oil storage groove is disposed towards the chain. The first mounting part is provided with an oil can containing lubricating oil and an oil pump. The oil pump is adapted to pump lubricating oil into the oil guide groove through the oil injection hole, and the lubricating oil then flows into the oil storage groove and lubricates the chain. Compared with the prior art of setting the oil injection hole in the first mounting part, this design can prevent lubricating oil splashing and has a higher overall cleanliness.

[0035] Preferably, the first support device includes a left housing and a right housing, which are adapted to be assembled along the drive shaft direction and define the gripping portion and the first mounting portion. The detachable left and right housings facilitate the installation of the drive unit, oil pump, oil reservoir, etc.

[0036] Preferably, the first rotating surface also has a perforated area, through which the user can observe the remaining oil level in the oil reservoir and replenish the lubricating oil in a timely manner, ensuring that the chain is always in a good lubricated state, extending the service life of the chain and the chainsaw, and reducing maintenance costs. The oil reservoir is equipped with an oil inlet, which extends from the first housing and is exposed to the outside.

[0037] Preferably, a protective plate is rotatably provided on the upper surface of the first mounting part, and an auxiliary handle is provided on the left side of the first mounting part.

[0038] The beneficial effects of this invention are:

[0039] 1. Through a unique second support device design, the chain guide plate and chain can rotate 180° around the drive shaft relative to the first mounting part, realizing the switch from the initial state to the folded state. In the folded state, the overall size of the chainsaw is greatly reduced, and the overall length after folding is shortened to 50%-60% of the initial state, making it convenient for users to carry to various work sites.

[0040] 2. The adjustment mechanism uses a combination of adjustment knob and cam assembly. Users only need to rotate the adjustment knob to drive the disc cam to rotate, which in turn drives the chain guide plate to move closer to or away from the sprocket along its length through the driven part, so as to achieve quick and precise adjustment of the chain tension.

[0041] 3. The locking mechanism provides strong protection for the safety of the chainsaw. When the locking pin is engaged with the locking slot, the blade assembly is fixed in its initial state and cannot rotate freely, effectively preventing accidents caused by accidental blade rotation. Furthermore, by setting multiple locking pins, the blade assembly can be fixed at different angles to adapt to different work environments. In addition, the return spring design allows the locking pin to automatically return to its unlocked state after the unlocking operation is completed, facilitating the adjustment of the blade angle by rotating the second support mechanism.

[0042] 4. The multi-angle engagement mechanism of the fan-shaped limiting part and the limiting claw, combined with the locking mechanism, achieves double locking to prevent the tool assembly from rotating unexpectedly, avoiding operator injury and improving the safety of the chainsaw during use. A single limiting groove can achieve precise positioning of a minimum rotation angle of 10°, and is equipped with an indicator with an angle scale and a synchronously rotating arrow mark. Combined with the tactile feedback of the limiting claw, it achieves dual sensing of the folding angle.

[0043] 5. The lubrication system, consisting of an oil filling hole, oil guide groove, oil storage tank, and oil guide hole, allows lubricating oil to be pumped from the oil reservoir through the oil filling hole into the oil guide groove, and then into the oil storage tank to lubricate the chain. The entire process is smooth and efficient. Furthermore, the oil guide groove is oriented towards the first rotating surface, so that when the lubricating oil flows through the oil guide groove, it can also lubricate the first and second rotating surfaces, improving the smoothness of the rotation process. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the initial state of a foldable lithium-ion electric saw provided by the present invention.

[0045] Figure 2 A front view of a foldable lithium-ion electric saw in its initial state, as provided by the present invention.

[0046] Figure 3 This is a schematic diagram of the folded state of a foldable lithium-ion electric saw provided by the present invention.

[0047] Figure 4 This is a front view of a foldable lithium-ion electric saw in its folded state, as provided by the present invention.

[0048] Figure 5 This is a schematic diagram of the structure of the first support device and related components provided by the present invention.

[0049] Figure 6 This is a schematic diagram of the structure of the second support device and the cutting tool assembly provided by the present invention.

[0050] Figure 7 This is a partial cross-sectional structural diagram of the second support device and the cutting tool assembly provided by the present invention.

[0051] Figure 8 This is another cross-sectional structural diagram of the second support device and the cutting tool assembly provided by the present invention.

[0052] Figure 9 This is an assembly diagram of the rotating guide plate and the clamping component provided by the present invention.

[0053] Figure 10 This is an assembly diagram of the rotating guide plate and the clamping member from another angle, provided by the present invention.

[0054] Figure 11 This is a schematic diagram of the rotating guide plate provided by the present invention.

[0055] Figure 12 This is a schematic diagram of the cam assembly provided by the present invention.

[0056] Figure 13 This is a schematic diagram of the state of a foldable lithium chainsaw after rotating 45° clockwise from its initial state, as provided by the present invention.

[0057] In the diagram: 1. Drive unit; 11. Drive shaft; 21. Chain; 22. Sprocket; 23. Chain guide plate; 231. Guide groove; 3. Lithium battery; 4. First support device; 41. Left housing; 42. Right housing; 43. Grip part; 44. First mounting part; 441. First cavity; 442. First rotating surface; 443. Rotating shaft part; 444. Oil injection hole; 445. Hollowed-out area; 45. Protective plate; 46. Auxiliary handle; 5. Second support device; 51. Rotating guide plate; 511. Second rotating surface; 512. Third rotating surface; 513. Bushing part; 514. Boss; 5141. Positioning protrusion; 515. Guide rail; 516. Fan-shaped limiting part; 5161. Limiting groove; 517. Oil guide groove; 518. Oil storage tank 519. Oil guide hole; 52. Cover plate; 521. Indicator arrow; 53. Second cavity; 532. Comb teeth; 541. First sealing ring; 542. Second sealing ring; 551. T-screw; 552. Nut; 553. Tightening knob; 61. Adjusting knob; 62. Disc cam; 63. Follower; 631. Follower plate; 632. Follower protrusion; 6321. Follower plane; 71. Locking groove; 72. Locking pin; 721. First stop part; 73. Locking knob; 74. Return spring; 75. Unlocking groove; 751. Second stop ring; 8. Pressing part; 81. Pressing plate; 82. Limiting claw; 821. Cantilever part; 822. Claw part; 83. Positioning block; 84. Positioning groove; 9. Oil can; 91. Oil inlet. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0059] It should also be noted that, in order to avoid obscuring the invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0060] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0061] like Figure 1-13 The foldable lithium-ion electric saw includes a drive unit 1, a blade assembly, a lithium battery 3, a first support device 4, a second support device 5, and an adjustment mechanism. The blade assembly includes a chain 21, a sprocket 22, and a chain guide plate 23. The sprocket 22 is driven to a drive shaft 11 and remains relatively fixed to the drive shaft 11 to ensure stable power transmission. More specifically, the sprocket 22 is a nine-tooth sprocket, which meshes with the chain 21. The sprocket 22 and the chain guide plate 23 cooperate to support the chain 21, ensuring its stability and safety during operation. The drive unit 1 provides power to the blade assembly through the drive shaft 11, ensuring the normal operation of the chain 21 and the sprocket 22, thereby achieving the cutting function. The lithium battery 3 provides power to the drive unit 1. The first support device 4 includes a left housing 41 and a right housing 42, which are adapted to be assembled along the drive shaft 11 and define a gripping portion 43 and a first mounting portion 44. The first mounting portion 44 and the lithium battery 3 are respectively disposed at both ends of the gripping portion 43. The first mounting portion 44 defines a first cavity 441, and a portion of the drive device 1 is disposed in the first cavity 441. The drive shaft 11 is arranged perpendicular to the extending direction of the first support device 4. The second support device 5 is adapted to slide and support the chain guide plate 23. The second support device 5 is adapted to rotate about the drive shaft 11 relative to the first mounting portion 44. The chain guide plate 23 and the chain 21 rotate synchronously with the second support device 5 to switch the tool assembly between an initial state and a folded state. An adjustment mechanism is adapted to adjust the tension of the chain 21 by driving the chain guide plate 23 to approach / move away from the sprocket 22 along its length direction. In the initial state, the chain guide plate 23 extends parallel to the extension direction of the first support device 4 and extends outward toward the first mounting portion 44. In the folded state, the chain guide plate 23 extends parallel to the extension direction of the first support device 4, and extends outward toward the first mounting portion 44. The cutter assembly rotates 180° from the initial state to the folded state. In the folded state, the overall size of the chainsaw is significantly reduced, and the overall length h2 after folding is shortened to 60% of the overall length h1 in the initial state.

[0062] In this embodiment, the second support device 5 includes a rotating guide plate 51 and a cover plate 52. The rotating guide plate 51 and the cover plate 52 are adapted to be assembled along the direction of the drive shaft 11 and define a second cavity 53. The second cavity 53 includes an outlet, which is provided with comb teeth 532 to automatically clean wood chips and branches wrapped on the chain 21. A sprocket 22 is installed in the second cavity 53, and the drive shaft 11 is adapted to extend into the second cavity 53 and connect to the sprocket 22. The chain guide plate 23 extends out of the second cavity 53 through the outlet.

[0063] In this embodiment, the first mounting part 44 includes a first rotating surface 442, and the rotating guide plate 51 includes a second rotating surface 511 and a third rotating surface 512 disposed opposite to each other, with the second rotating surface 511 facing the first rotating surface 442. The first rotating surface 442 is provided with a rotating shaft part 443, and the rotating guide plate 51 is formed with a bushing part 513, which is sleeved on the rotating shaft part 443. A clamping member 8 is disposed facing the third rotating surface 512, and the clamping member 8 is connected to the rotating shaft part 443 and provides axial positioning for the rotating guide plate 51. The clamping member 8 includes an annular clamping plate 81, the inner ring of which is connected to the rotating shaft part 443 by a plurality of screws, and the outer ring of which contacts the rotating sleeve part. The third rotating surface 512 is provided with a boss 514, and a guide rail 515 is provided on the boss 514. The chain guide plate 23 includes a guide groove 231 provided along its length direction. The guide rail 515 and the guide groove 231 reciprocate and slide together to eliminate the deflection error during the adjustment process.

[0064] In this embodiment, the adjustment mechanism includes an adjustment knob 61 and a cam assembly. The cam assembly includes a disc-mounted cam 62 and a follower 63 connected in a transmission manner. The follower 63 includes an integrally formed follower plate 631 and a follower protrusion 632. The disc-mounted cam 62, the follower plate 631, and the chain guide plate 23 are parallel to each other. The follower plate 631 is connected to the chain guide plate 23. The follower protrusion 632 includes a follower plane 6321, which is perpendicular to the length direction of the chain guide plate 23. The outer contour of the disc-mounted cam 62 contacts the follower plane 6321. The force between the disc-mounted cam 62 and the follower 63 is set along the length direction of the chain guide plate 23. The disc-mounted cam 62 is connected to the adjustment knob 61. The adjustment knob 61 drives the disc-mounted cam 62 to rotate, which in turn drives the chain guide plate 23 to move closer to / away from the sprocket 22 via the follower 63.

[0065] In this embodiment, the rotating guide plate 51 and the cover plate 52 are detachably connected by a bolt structure, facilitating disassembly and maintenance. The bolt structure includes a T-screw 551, a nut 552, and a tightening knob 553. The T-screw 551 is mounted on the rotating guide plate 51, and the tightening knob 553 is fixedly connected to the nut 552. The tightening knob 553 is located on the outside of the cover plate 52, and the nut 552 extends into the second cavity 53 and is threadedly connected. The T-screw 551 is arranged along the direction of the drive shaft 11. Further, an adjusting knob 61 is located on the outside of the cover plate 52. The adjusting knob 61 and the tightening knob 553 are coaxially arranged. The tightening knob 553, in conjunction with the cover plate 52, provides axial restraint for the adjusting knob 61, and the nut 552 is adapted to pass through the adjusting knob 61 and provide radial restraint for it.

[0066] In this embodiment, the foldable lithium-ion electric saw includes a locking mechanism adapted to restrict the rotation of the second support mechanism relative to the first support mechanism. The locking mechanism includes a plurality of locking slots 71, locking pins 72, locking knobs 73, return springs 74, and unlocking slots 75. The locking slots 71 extend perpendicularly to the first rotation surface 442 into the first cavity 441, and the unlocking slots 75 extend perpendicularly to the second rotation surface 511 into the second cavity 53. The locking pins 72 are telescopically disposed in the unlocking slots 75 and are arranged parallel to the drive shaft 11. The locking knobs 73 are adapted to drive the locking pins 72 to engage or disengage with the locking slots 71 to achieve locking / unlocking. When the locking pins 72 are engaged with one of the locking slots 71, the tool assembly is in its initial state. The locking pin 72 includes a first stop portion 721 protruding radially therefrom, and a second stop ring 751 is provided in the unlocking groove 75. The first stop portion 721 abuts against the second stop ring 751 to prevent the locking pin 72 from disengaging from the unlocking groove 75. The two ends of the return spring 74 abut against the second stop ring 751 and the locking knob 73. The return spring 74 drives the locking pin 72 to remain fully contained in the unlocking groove 75 to maintain the unlocked state.

[0067] In this embodiment, the third rotating surface 512 includes a fan-shaped limiting portion 516 surrounding the bushing portion 513. The fan-shaped limiting portion 516 includes several circumferentially distributed limiting grooves 5161. The clamping member 8 includes a limiting claw 82 extending outward from the clamping plate 81. The limiting claw 82 includes a cantilever portion 821 extending outward along one radial direction of the clamping plate 81 and a clenching claw portion 822 disposed at the free end of the cantilever portion 821. The clenching claw portion 822 has a V-shaped structure. When the second support device 5 rotates, the clenching claw portion 822 can engage with the limiting grooves 5161 one by one. The arc of the fan-shaped limiting portion 516 is π / 2. Each time the limiting claw 82 switches to engage with a limiting groove 5161, the second rotating mechanism rotates 15°.

[0068] In this embodiment, the first rotating surface 442 includes several indicators, and the cover plate 52 includes indicator arrows 521. The indicator arrows 521 can be selectively aligned with one of the indicators to indicate the rotation angle. The indicators include three points: 90°, 135°, and 180°. The angle between any two adjacent indicators is 45°, which is three times the angle between any two adjacent limiting grooves 5161. The locking grooves 71 correspond one-to-one with the indicators, or the locking groove 71 corresponds only to the 180° indicator. The corresponding locking grooves 71 and indicators are symmetrical about the center of the sprocket 22. Users can intuitively understand the folding angle and status of the device, making operation more intuitive and convenient.

[0069] In this embodiment, the clamping member 8 also includes a positioning block 83, which forms a positioning groove 84 with the clamping plate 81. The boss 514 includes a positioning protrusion 5141. When the positioning protrusion 5141 is inserted into the positioning groove 84, the tool assembly is in the initial state and the second support device 5 can only rotate in one direction.

[0070] In this embodiment, the first rotating surface 442 is provided with an oil injection hole 444. The rotating guide plate 51 includes an oil guide groove 517 disposed on the second rotating surface 511, an oil storage groove 518 disposed on the third rotating surface 512, and an oil guide hole 519 connecting the oil guide groove 517 and the oil storage groove 518. The oil guide groove 517 is disposed towards the first rotating surface 442. A first sealing ring 541 and a second sealing ring 542 are respectively disposed radially inside and outside the oil guide groove 517. The oil storage groove 518 is disposed towards the chain 21. The first mounting part 44 is provided with an oil can 9 containing lubricating oil and an oil pump. The oil pump is adapted to pump lubricating oil into the oil guide groove 517 through the oil injection hole 444, and the lubricating oil then flows into the oil storage groove 518 and lubricates the chain 21. Compared with the prior art of setting the oil injection hole 444 in the first mounting part 44, this design can prevent lubricating oil splashing and has a higher overall cleanliness.

[0071] In this embodiment, the first rotating surface 442 is also provided with a hollow area 445, through which the user can observe the remaining oil level in the oil can 9 and replenish the lubricating oil in time to ensure that the chain 21 is always in a good lubricated state, extend the service life of the chain 21 and the electric saw, and reduce maintenance costs. The oil can 9 is provided with an oil inlet 91, which extends out of the first housing and is exposed to the outside.

[0072] In this embodiment, a protective plate 45 is rotatably provided on the upper surface of the first mounting part 44, and an auxiliary handle 46 is provided on the left side of the first mounting part 44.

[0073] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A foldable lithium-ion electric saw, characterized in that, include: A drive unit, which includes a drive shaft; A cutting tool assembly includes a chain, a sprocket, and a chain guide plate. The sprocket is driven to the drive shaft, and the sprocket is fixed relative to the drive shaft. The sprocket and the chain guide plate cooperate to support the chain, and the sprocket meshes with the chain. A first support device includes a gripping part and a first mounting part disposed at one end of the gripping part. The first mounting part includes a first rotating surface and a rotating shaft part protruding from the first rotating surface. The drive device is mounted on the first mounting part and the drive shaft is arranged perpendicular to the extension direction of the first support device. The second support device includes a rotating guide plate and a cover plate. The rotating guide plate has a bushing portion that is sleeved on the rotating shaft portion. The rotating guide plate includes a second rotating surface and a third rotating surface that are disposed opposite to each other. The second rotating surface is disposed facing the first rotating surface. The rotating guide plate and the cover plate are adapted to be assembled along the direction of the drive shaft and define a second cavity. The sprocket is installed in the second cavity. The drive shaft is adapted to extend into the second cavity and connect to the sprocket. The second cavity includes an outlet, and the chain guide plate extends out of the second cavity through the outlet. The third rotating surface is provided with a guide rail, and the chain guide plate includes a guide groove arranged along its length direction. The guide rail and the guide groove reciprocate to slide and support the chain guide plate. The second support device is adapted to rotate about the drive shaft relative to the first mounting portion, and the chain guide plate and the chain rotate synchronously with the second support device to switch the tool assembly between an initial state and a folded state; An adjustment mechanism includes an adjustment knob and a cam assembly. The cam assembly includes a drive-connected disc cam and a follower. The follower is connected to the chain guide plate, and the disc cam is connected to the adjustment knob. The adjustment knob drives the disc cam to rotate, which in turn drives the chain guide plate to move closer to / away from the sprocket via the follower. A clamping component includes an annular clamping plate, the inner ring of which is connected to the rotating shaft by a plurality of screws, and the outer ring of which contacts the bushing. The clamping component provides axial restraint for the rotating guide plate. In the initial state, the chain guide plate extends in a direction parallel to the extension direction of the first support device and extends outward toward the first mounting portion. In the folded state, the extension direction of the chain guide plate is parallel to the extension direction of the first support device, the chain guide plate extends outward away from the first mounting part, and the cutter assembly rotates 180° from the initial state to switch to the folded state.

2. The foldable lithium-ion electric saw according to claim 1, characterized in that, The driven member includes an integral driven plate and a driven protrusion. The disc-mounted cam, the driven plate, and the chain guide are parallel to each other. The driven plate is connected to the chain guide. The driven protrusion includes a driven plane, which is perpendicular to the length direction of the chain guide. The outer contour of the disc-mounted cam contacts the driven plane. When the disc-mounted cam rotates, the force between the disc-mounted cam and the driven member is set along the length direction of the chain guide.

3. A foldable lithium-ion electric saw according to claim 1, characterized in that, It also includes a locking mechanism adapted to restrict rotation of the second support device relative to the first support device, the locking mechanism comprising: At least one locking groove, the locking groove extending inward perpendicular to the first rotational surface; A locking pin, which is telescopically mounted on the second support device, is arranged parallel to the drive shaft direction. A locking knob adapted to drive the locking pin to engage or disengage from the locking slot to achieve locking / unlocking, wherein the tool assembly is in an initial state when the locking pin is engaged with one of the locking slots; A return spring adapted to drive the locking pin to remain out of the locking slot to maintain the unlocked state; The third rotating surface includes a fan-shaped limiting part surrounding the bushing portion. The fan-shaped limiting part includes several circumferentially distributed limiting grooves. The clamping member includes limiting claws extending outward from the clamping plate. When the second support device rotates, the limiting claws can be engaged with the limiting grooves one by one.

4. A foldable lithium-ion electric saw according to claim 3, characterized in that, The locking pin includes a first stop portion protruding radially therefrom, the second support device forms an unlocking groove, a second stop ring is provided in the unlocking groove, the first stop portion abuts against the second stop ring to restrict the locking pin from disengaging from the unlocking groove, the two ends of the return spring abut against the second stop ring and the locking knob, and the return spring drives the locking pin to remain fully contained in the unlocking groove.

5. A foldable lithium-ion electric saw according to claim 3, characterized in that, At least one of the following must be met: The arc of the fan-shaped limiting part is π / 2. Each time the limiting claw switches to engage with one of the limiting slots, the second support device rotates 10°-20°. The limiting claw includes a cantilever portion extending radially outward along the clamping plate and a claw portion disposed at the free end of the cantilever portion, the claw portion having a V-shaped structure; The first rotating surface includes a plurality of indicators, the cover plate includes an indicator arrow, the indicator arrow is aligned with one of the indicators to indicate the rotation angle, the locking groove corresponds one-to-one with the indicators, and each locking groove and its corresponding indicator are symmetrical about the center of the sprocket.

6. A foldable lithium-ion electric saw according to claim 1, characterized in that, The first rotating surface is provided with an oil injection hole. The rotating guide plate includes an oil guide groove provided on the second rotating surface, an oil storage groove provided on the third rotating surface, and an oil guide hole connecting the oil guide groove and the oil storage groove. The oil guide groove is provided facing the first rotating surface. A first sealing ring and a second sealing ring are respectively provided radially inside and outside the oil guide groove. The oil storage groove is provided towards the chain. The first mounting part is equipped with an oil reservoir containing lubricating oil and an oil pump. The oil pump is adapted to pump the lubricating oil into the oil guide groove through the oil injection hole, and the lubricating oil then flows into the oil storage tank and lubricates the chain.

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