Chain saw

Abstract

The chain saw comprises a fuel tank, a handle, a first filter, a carburetor and a vacuum pipe, the fuel tank is used for storing fuel, the handle is provided with a containing space, a first oil inlet pipe is arranged in the containing space, the first filter is arranged in the fuel tank and connected with the first end of the first oil inlet pipe, and the carburetor is connected with the carburetor. The carburetor is connected with the second end of the first oil inlet pipe and used for atomizing fuel oil and mixing the fuel oil with air to form mixed gas, and the vacuum pipe is connected with the carburetor and the engine to convey the mixed gas to the engine. The first oil inlet pipe is arranged in the accommodating space of the handle, and the handle is far away from a high-temperature area of the engine, so that the first oil inlet pipe is basically separated from a waste heat baking range of the engine, the probability of evaporation of fuel oil in the first oil inlet pipe due to high temperature is greatly reduced, and the condition of steam condensation or bubble retention in a pipeline is reduced; fuel oil can flow normally during next starting, oil supply interruption or oil absorption difficulty of the carburetor is avoided, and the possibility that starting fails or a starting rope needs to be pulled many times is reduced.

Description

Technical Field

[0001] This utility model relates to the field of cutting equipment technology, and in particular to a chainsaw. Background Technology

[0002] Chainsaws, as portable power tools, are widely used in forestry, horticulture, and other fields. A traditional chainsaw's fuel supply system typically includes a fuel tank, fuel inlet pipe, carburetor, and engine. The fuel inlet pipe is responsible for delivering fuel from the fuel tank to the carburetor. The carburetor atomizes the fuel and mixes it with air to form a suitable combustion mixture, which is then supplied to the engine to ensure its normal operation.

[0003] However, in existing technology, especially in older chainsaw designs, the fuel inlet pipe typically passes under the engine or near the high-temperature zone. When the chainsaw stops, the engine's residual heat is transferred to the fuel inlet pipe, causing residual fuel inside to evaporate and produce fuel vapor. As the engine cools down completely, the vapor condenses or forms bubbles, remaining in the fuel inlet pipe. When the chainsaw is started again, these bubbles obstruct the normal flow of fuel, causing fuel supply interruptions or difficulty in carburetor intake, leading to starting failures or requiring multiple pulls of the starter rope to restore normal fuel supply.

[0004] Therefore, improvements to existing technologies are necessary. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a chainsaw that solves the problem that in existing chainsaws, the oil inlet pipe is close to the high-temperature zone of the engine. After the engine stops, residual heat causes the fuel to evaporate into vapor, which then condenses or forms bubbles that remain in the pipe after cooling, hindering normal fuel flow during the next start-up, leading to fuel supply problems and starting difficulties.

[0006] A chainsaw according to an embodiment of the present invention includes:

[0007] Fuel tank, used to store fuel;

[0008] The handle has a receiving space, and a first oil inlet pipe is provided in the receiving space;

[0009] The first filter is located inside the fuel tank and is connected to the first end of the first fuel inlet pipe;

[0010] A carburetor, connected to the second end of the first fuel inlet pipe, is used to atomize fuel and mix it with air to form a mixture;

[0011] A vacuum tube connects the carburetor and the engine to deliver the air-fuel mixture to the engine.

[0012] According to an embodiment of the present invention, a chainsaw has at least the following beneficial effects: The present invention sets the first oil inlet pipe in the receiving space of the handle, and the handle position is far away from the high temperature zone of the engine, so that the first oil inlet pipe is basically out of the range of residual heat baking of the engine, which greatly reduces the probability of fuel evaporation in the first oil inlet pipe due to high temperature, reduces the situation of vapor condensation or bubbles stuck in the pipe, ensures that the fuel can flow normally when starting next time, avoids fuel supply interruption or difficulty in carburetor fuel intake, and reduces the possibility of starting failure or needing to pull the starter rope multiple times.

[0013] According to some embodiments of the present invention, the chainsaw further includes an oil bubble and a second oil inlet pipe, and a third oil inlet pipe is provided in the accommodating space. The second oil inlet pipe connects the oil inlet end of the oil bubble and the oil tank, and the third oil inlet pipe connects the carburetor and the oil outlet end of the oil bubble.

[0014] According to some embodiments of the present invention, the chainsaw further includes a left crankcase and a right crankcase, which are detachably connected to form a mounting cavity, and the engine is disposed in the mounting cavity.

[0015] According to some embodiments of this utility model, the right crankcase is connected to an oil tank cover, the left crankcase includes a cavity, a first partition is provided in the cavity to divide the cavity into an oil tank and a fuel tank, a second partition is provided on the inner side of the oil tank cover, the oil tank cover is located at the opening of the cavity and connected to the left crankcase, the second partition abuts against the first partition, and the oil tank and the fuel tank are not in communication with each other.

[0016] According to some embodiments of the present invention, a second filter is provided in the oil tank, and the second filter is connected to a chain lubricating oil pump through a fourth oil inlet pipe. The chain lubricating oil pump is connected to the engine and is used to supply oil to the saw chain.

[0017] According to some embodiments of the present invention, the chainsaw further includes a first sealing cover and a second sealing cover. The oil tank cover is provided with a first oil filling hole and a second oil filling hole. The first oil filling hole is connected to the fuel tank, and the second oil filling hole is connected to the engine oil tank. The first sealing cover is located at the first oil filling hole to seal the first oil filling hole, and the second sealing cover is located at the second oil filling hole to seal the second oil filling hole.

[0018] According to some embodiments of the present invention, the inner walls of the first oil filling hole and the second oil filling hole are both provided with threads, the outer walls of the first sealing cover and the second sealing cover are both provided with threads, the first sealing cover is threadedly connected to the first oil filling hole, the second sealing cover is threadedly connected to the second oil filling hole, and the first sealing cover and the second sealing cover are respectively provided with a first protrusion and a second protrusion on the side away from the oil tank cover.

[0019] According to some embodiments of the present invention, the chainsaw further includes a one-way valve and a sealing strip. The one-way valve is connected to the vacuum tube to prevent the mixed gas from flowing back to the carburetor. The sealing strip is located on the mating surface of the first partition and the second partition.

[0020] According to some embodiments of the present invention, the chainsaw further includes bolts that connect both ends of the handle to the left crankcase.

[0021] According to some embodiments of the present invention, the chainsaw further includes a cover and a handle. The right crankcase has an opening that connects to the mounting cavity. The cover and the engine are located on opposite sides of the opening. The cover is connected to the right crankcase. The two ends of the handle are respectively connected to the cover and the handle. Both the handle and the handle are provided with anti-slip textures.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of a chainsaw according to an embodiment of the present invention. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the structure of a chainsaw according to an embodiment of the present invention. Figure 2 ;

[0026] Figure 3 This is a schematic diagram of the structure of a chainsaw according to an embodiment of the present invention. Figure 3 ;

[0027] Figure 4 This is a schematic diagram of the structure of a chainsaw according to an embodiment of the present invention. Figure 4 ;

[0028] Figure 5 This is a schematic diagram of the structure of a chainsaw according to an embodiment of the present invention. Figure 5 ;

[0029] Figure 6 This is a schematic diagram of the structure of the fuel tank cover according to an embodiment of the present utility model.

[0030] Reference numerals: 10. Left crankcase; 11. First partition; 12. Fuel tank; 13. Oil tank; 14. Fuel tank cap; 15. First sealing cap; 16. Second sealing cap; 17. Right crankcase; 18. Second partition; 19. Flywheel;

[0031] 20. First filter; 21. First fuel inlet pipe; 22. Carburetor; 23. Second fuel inlet pipe; 24. Fuel bubble; 25. Third fuel inlet pipe; 26. Vacuum tube;

[0032] 30. Second filter; 31. Fourth oil inlet pipe; 32. Chain lubrication oil pump;

[0033] 40. Handle; 41. Lifting handle; 42. Engine cover; 43. First protrusion; 44. Second protrusion; 45. Bolt; 46. Opening; 47. First oil filling hole; 48. Second oil filling hole; 49. Cylinder. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0035] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0037] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of these terms in this utility model based on the specific content of the technical solution. In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. In the description of this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] Reference Figures 1-6 An embodiment of the present invention provides a chainsaw comprising:

[0039] Fuel tank 12 is used to store fuel;

[0040] The handle 40 has a receiving space, and the first oil inlet pipe 21 is provided in the receiving space;

[0041] The first filter 20 is installed inside the fuel tank 12 and connected to the first end of the first fuel inlet pipe 21;

[0042] Carburetor 22, connected to the second end of the first fuel inlet pipe 21, is used to atomize fuel and mix it with air to form a mixture;

[0043] Vacuum tube 26 connects carburetor 22 and engine to deliver air-fuel mixture to engine.

[0044] In this invention, fuel is stored in the fuel tank 12 and enters the first filter 20 under gravity. After being filtered by the first filter 20, it enters the first fuel inlet pipe 21. The first fuel inlet pipe 21 is positioned within the receiving space of the handle 40, which is far from the high-temperature area of ​​the engine. This ensures that the first fuel inlet pipe 21 is essentially out of the range of residual heat from the engine, significantly reducing the probability of fuel evaporation due to high temperature in the first fuel inlet pipe 21. It also reduces the possibility of vapor condensation or bubbles accumulating in the pipe, ensuring that fuel can flow normally during the next start-up. This avoids fuel supply interruption or difficulty in fuel intake by the carburetor 22, reducing the possibility of start-up failure or the need to pull the starter rope multiple times. The other end of the first fuel inlet pipe 21 is connected to the carburetor 22. The fuel is atomized and mixed with air in the carburetor 22 to form a combustible mixture. The mixture generated by the carburetor 22 is delivered to the engine through the vacuum tube 26. The engine draws in the mixture and ignites it, driving the chainsaw to work.

[0045] Specifically, the chainsaw also includes an oil bubble 24 and a second oil inlet pipe 23, and a third oil inlet pipe 25 is provided in the housing space. The second oil inlet pipe 23 connects the oil inlet end of the oil bubble 24 and the oil tank, and the third oil inlet pipe 25 connects the carburetor 22 and the oil outlet end of the oil bubble 24.

[0046] Under idling or low-load conditions, the first fuel inlet pipe 21 is responsible for supplying fuel. After being filtered by the first filter 20, the fuel from the fuel tank is directly delivered to the carburetor 22 through the first fuel inlet pipe 21. The fuel is atomized and mixed with air in the carburetor 22 to form a combustible mixture. The mixture generated by the carburetor 22 is delivered to the engine through the vacuum pipe 26. The engine draws in the mixture and ignites it, driving the chainsaw to work. Under high-load conditions, in addition to the first fuel inlet pipe 21, the second and third fuel inlet pipes 23 and 25 also supply fuel. Fuel enters the fuel bubble 24 from the fuel tank via the second fuel inlet pipe 23. The fuel bubble 24, through pulse boosting, delivers the fuel to the carburetor 22 via the third fuel inlet pipe 25. The fuel bubble 24 compensates for insufficient fuel supply under high load. The third fuel inlet pipe 25 is also located within the housing space of the handle 40. The handle 40 is far from the high-temperature area of ​​the engine, keeping the third fuel inlet pipe 25 essentially out of the range of residual heat from the engine. This significantly reduces the probability of fuel evaporation due to high temperature within the third fuel inlet pipe 25, minimizing vapor condensation or air bubbles trapped in the pipe. This ensures normal fuel flow during the next start, avoiding fuel supply interruptions or difficulty in fuel intake for the carburetor 22, and reducing the possibility of start-up failures or the need to pull the starter rope multiple times.

[0047] Specifically, the chainsaw also includes a left crankcase 10 and a right crankcase 17, which are detachably connected to form a mounting cavity, and the engine is installed in the mounting cavity.

[0048] Specifically, the right crankcase 17 is connected to the oil tank cap 14, and the left crankcase 10 includes a cavity. A first partition 11 is provided in the cavity, dividing the cavity into an oil tank 13 and a fuel tank 12. A second partition 18 is provided on the inner side of the oil tank cap 14. The oil tank cap 14 is located at the opening 46 of the cavity and is connected to the left crankcase 10. The second partition 18 abuts against the first partition 11. The oil tank 13 and the fuel tank 12 are not connected to each other.

[0049] The chainsaw also includes a sealing strip located on the mating surface of the first partition 11 and the second partition 18.

[0050] The left and right crankcases 17 are precisely assembled using bolts 45 and locating pin holes. A first partition 11 is installed inside the cavity of the left crankcase 10, dividing the cavity into an oil tank 13 and a fuel tank 12. Triangular reinforcing ribs are provided at the bottom of the first partition 11 to enhance its resistance to deformation. A second partition 18 on the inner side of the fuel tank cap 14 fits against the end face of the first partition 11 to form a physical barrier. A sealing strip, through pre-compression deformation, fills the space between the first partition 11 and the second partition 18, dynamically compensating for the gap through elastic deformation to maintain sealing, eliminate gaps, and achieve absolute isolation between fuel and engine oil.

[0051] Specifically, a second filter 30 is installed in the oil tank 13. The second filter 30 is connected to the chain lubrication oil pump 32 through the fourth oil inlet pipe 31. The chain lubrication oil pump 32 is connected to the engine and is used to supply oil to the saw chain.

[0052] Specifically, the chainsaw also includes a first sealing cover 15 and a second sealing cover 16. The fuel tank cover 14 is provided with a first oil filling hole 47 and a second oil filling hole 48. The first oil filling hole 47 is connected to the fuel tank 12, and the second oil filling hole 48 is connected to the engine oil tank 13. The first sealing cover 15 is located at the first oil filling hole 47 to seal the first oil filling hole 47, and the second sealing cover 16 is located at the second oil filling hole 48 to seal the second oil filling hole 48.

[0053] Specifically, the inner walls of the first oil filling hole 47 and the second oil filling hole 48 are both threaded, and the outer walls of the first sealing cover 15 and the second sealing cover 16 are both threaded. The first sealing cover 15 is threaded to the first oil filling hole 47, and the second sealing cover 16 is threaded to the second oil filling hole 48. The first sealing cover 15 and the second sealing cover 16 are respectively provided with a first protrusion 43 and a second protrusion 44 on the side away from the oil tank cover 14.

[0054] The engine oil in the oil tank 13 is filtered by the second filter 30 to remove impurities such as metal shavings and carbonized particles, preventing blockage of the chain lubrication pump 32. The first oil filling hole 47 is located on the top left side of the oil tank cap 14, and the second oil filling hole 48 is located on the top right side of the oil tank cap 14. When fuel or engine oil needs to be added, rotate the first sealing cap 15 and the second sealing cap 16 counterclockwise respectively. After the first sealing cap 15 and the second sealing cap 16 are disengaged from the first oil filling hole 47 and the second oil filling hole 48 respectively, fuel or engine oil can be added. After adding, rotate the first sealing cap 15 and the second sealing cap 16 clockwise. The first protrusion 43 and the second protrusion 44 facilitate the user's rotation of the first sealing cap 15 and the second sealing cap 16.

[0055] Specifically, the chainsaw also includes a one-way valve connected to a vacuum tube 26 to prevent the air-fuel mixture from flowing back to the carburetor 22.

[0056] The one-way valve, through its one-way conduction characteristic, allows the combustible mixture formed by the air and fuel mixed in the carburetor 22 to be sent into the engine's combustion chamber. When the engine backfires or decelerates, the pressure in the combustion chamber is higher than that in the carburetor 22, and the one-way valve automatically closes to prevent the mixture from flowing back into the carburetor 22, thus avoiding interference with fuel atomization due to reverse airflow.

[0057] Specifically, the chainsaw also includes bolts 45, which connect the two ends of the handle 40 to the left crankcase 10. As fasteners, bolts 45 rigidly fix the two ends of the handle 40 to the left crankcase 10, forming a force support point for the operator to hold. The bolt connection facilitates the disassembly, maintenance, or replacement of the handle 40.

[0058] Specifically, the chainsaw also includes a cover 42 and a handle 41. The right crankcase 17 has an opening 46, which connects to the mounting cavity. The cover 42 and the engine are located on both sides of the opening 46. The cover 42 is connected to the right crankcase 17. The two ends of the handle 41 are connected to the cover 42 and the handle 40, respectively. Both the handle 40 and the handle 41 are provided with anti-slip texture.

[0059] The engine's operating status can be observed through the opening 46. The opening 46, together with the engine cover 42, forms an airflow channel, enhancing heat dissipation inside the crankcase and preventing overheating. The handle 41 is connected to the engine cover 42 and the handle 40 at both ends, forming a triangular support structure to distribute the weight of the handle 40, avoiding stress concentration at a single point. Anti-slip textures (such as diamond-shaped ridges or rubber coating) enhance grip friction.

[0060] The engine includes cylinder 49 and flywheel 19. Cylinder 49 is where the air-fuel mixture burns and explodes. The piston is subjected to gas pressure inside cylinder 49 and converts linear motion into crankshaft rotational motion through connecting rods, thus achieving power output. Flywheel 19 stores energy during the power stroke and releases energy during the non-power stroke, ensuring stable crankshaft speed and avoiding speed fluctuations caused by intermittent power output.

[0061] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A chainsaw, characterized in that The utility model relates to a chain saw, comprising: a fuel tank for storing fuel; a handle provided with a containing space, wherein a first oil inlet pipe is arranged in the containing space; a first filter arranged in the fuel tank and connected with a first end of the first oil inlet pipe; a carburetor connected with a second end of the first oil inlet pipe, for atomizing fuel and mixing with air to form a mixture; a vacuum pipe connected with the carburetor and the engine, for delivering the mixture to the engine.

2. The chainsaw of claim 1, wherein Further comprising an oil bubble and a second oil inlet pipe, wherein a third oil inlet pipe is arranged in the containing space, the second oil inlet pipe is connected with an oil inlet end of the oil bubble and the fuel tank, and the third oil inlet pipe is connected with the carburetor and an oil outlet end of the oil bubble.

3. The chainsaw of claim 1, wherein: Further comprising a left crankcase and a right crankcase, wherein the left crankcase and the right crankcase are detachably connected and form a mounting cavity, and the engine is arranged in the mounting cavity.

4. The chainsaw of claim 3, wherein: The right crankcase is connected with a fuel tank cover, the left crankcase comprises a cavity, a first partition plate is arranged in the cavity, the cavity is divided into an oil tank and the fuel tank by the first partition plate, a second partition plate is arranged on an inner side of the fuel tank cover, the fuel tank cover is located at an opening of the cavity and connected with the left crankcase, the second partition plate abuts against the first partition plate, and the oil tank and the fuel tank are not in communication with each other.

5. The chainsaw of claim 4, wherein: A second filter is arranged in the oil tank, the second filter is connected with a chain lubricating oil pump through a fourth oil inlet pipe, the chain lubricating oil pump is connected with the engine, and the chain lubricating oil pump is used for supplying oil to a saw chain.

6. The chainsaw of claim 4, wherein, Further comprising a first sealing cover and a second sealing cover, wherein a first oil filling hole and a second oil filling hole are arranged on the fuel tank cover, the first oil filling hole is in communication with the fuel tank, the second oil filling hole is in communication with the oil tank, the first sealing cover is located at the first oil filling hole to seal the first oil filling hole, and the second sealing cover is located at the second oil filling hole to seal the second oil filling hole.

7. The chainsaw of claim 6, wherein An inner wall of the first oil filling hole and an inner wall of the second oil filling hole are provided with threads, an outer wall of the first sealing cover and an outer wall of the second sealing cover are provided with threads, the first sealing cover is threadedly connected with the first oil filling hole, the second sealing cover is threadedly connected with the second oil filling hole, and the first sealing cover and the second sealing cover are respectively provided with a first protrusion and a second protrusion on a side away from the fuel tank cover.

8. The chainsaw of claim 4, wherein, Further comprising a one-way valve and a sealing strip, wherein the one-way valve is connected with the vacuum pipe, the one-way valve is used for preventing the mixture from flowing back to the carburetor, and the sealing strip is located on a joint surface of the first partition plate and the second partition plate.

9. The chainsaw of claim 3, wherein, Further comprising a bolt, wherein the bolt connects two ends of the handle with the left crankcase.

10. The chainsaw of claim 9, wherein, Further comprising a machine cover and a handle, wherein the right crankcase is provided with an opening, the opening is in communication with the mounting cavity, the machine cover and the engine are located on two sides of the opening, the machine cover is connected with the right crankcase, two ends of the handle are respectively connected with the machine cover and the handle, and the handle and the handle are provided with anti-skid lines.

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