A four-stroke gasoline engine using mixed oil fuel for combustion and lubrication

Abstract

The present invention relates to a four-stroke gasoline engine that uses mixed oil fuel for combustion and lubrication, comprising a gasoline engine body, the gasoline engine body comprising a cylinder body, a valve chamber, a cam chamber, a crankshaft chamber and a piston chamber are arranged in the cylinder body, the valve chamber, the cam chamber, the crankshaft chamber, the piston chamber and the combustion chamber are connected in sequence, the valve chamber is located at the top of the cylinder body and is equipped with a valve rocker arm, a valve spring, a push rod, an intake valve and an exhaust valve, the cam chamber is equipped with a cam gear and a rocker arm shift block, the cam chamber comprises a cam chamber upper channel, an air storage chamber and a cam chamber lower channel, the cam chamber lower channel is connected with the crankshaft chamber to form a power chamber, a crankshaft is installed in the crankshaft chamber, an air intake port and an exhaust port are also arranged on the cylinder body, the air intake port is connected with an intake duct, the intake duct is connected with the intake valve to form an intake airflow forming chamber, the exhaust port is connected with an exhaust duct, the exhaust duct is connected with the exhaust valve to form an exhaust airflow chamber.

Description

Technical Field

[0001] The invention relates to the technical field of four-stroke gasoline engines, in particular to a four-stroke gasoline engine which uses mixed oil fuel for combustion and lubrication. Background Art

[0002] The existing four-stroke gasoline engine has many moving parts, and most of them use a special lubricating oil tank in the crankcase to lubricate the moving parts of the gasoline engine by splashing or forcing. The different positions of various parts result in multiple lubricating oil circuits and inconsistent oil supply, which also makes the structure of the four-stroke gasoline engine complex and heavy. It also limits the use of the gasoline engine and prevents it from being tilted or turned over significantly during use.

[0003] Existing two-stroke gasoline engines use mixed lubrication, that is, gasoline and engine oil are mixed in a certain proportion and stored in the fuel tank for use by the gasoline engine. The mixed oil enters the crankcase to lubricate the moving parts after being atomized by the carburetor and enters the combustion chamber to participate in combustion. This structure of the two-stroke gasoline engine determines that the gasoline engine can be tilted or inverted at will without affecting its operation. This advantage makes it widely used in the fields of garden machinery, plant protection machinery, small agricultural machinery, etc. However, two-stroke gasoline engines have always had problems such as incomplete scavenging, inadequate combustion, and poor emissions.

[0004] Existing technical solutions

[0005] For example, Chinese patent application with publication number CN 107676173 A discloses a four-stroke gasoline engine that uses two-stroke gasoline engine fuel for combustion and lubrication.

[0006] Its structure is that the exhaust valve and the intake valve are respectively installed on the driving rocker arm. A driving pulley is installed on the crankshaft, and the driving pulley is connected to the driven pulley through the timing belt, and the driven pulley is located on the camshaft. The valve chamber is also provided with a cylinder head intake duct, which is connected to the combustion chamber.

[0007] Disadvantages of existing technical solutions:

[0008] Difficult to achieve mass production: The intake valve and exhaust valve in the valve train have high installation precision requirements relative to the driving rocker arm and a complex structure, which is not conducive to mass production.

[0009] Heavy weight: The valve timing system directly connects the driving pulley to the crankshaft through the timing belt, which drives the driven pulley camshaft to achieve timing valve timing.

[0010] The disadvantages of the existing technical solutions are also high fuel consumption, low power and low original emission values. Summary of the invention

[0011] In view of the above-mentioned deficiencies in the prior art, the present invention provides a four-stroke gasoline engine that uses mixed oil fuel for combustion and lubrication, which has the advantages of small size, light weight, simple operation and maintenance, complete combustion, high environmental protection and low noise.

[0012] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is: a four-stroke gasoline engine that uses mixed oil fuel for combustion and lubrication, including a gasoline engine body, the gasoline engine body including a cylinder body, a valve chamber, a cam chamber, a crankshaft chamber and a piston chamber are arranged in the cylinder body, the valve chamber, cam chamber, crankshaft chamber, piston chamber and combustion chamber are connected in sequence, the valve chamber is located at the top of the cylinder body and is equipped with a valve rocker arm, a valve spring, a push rod, an intake valve and an exhaust valve, the cam chamber is equipped with a cam gear and a rocker arm shift block, the cam chamber includes a cam chamber upper channel, an air storage chamber and a cam chamber lower channel, the cam chamber lower channel is connected with the crankshaft chamber and forms a power chamber, a crankshaft is installed in the crankshaft chamber, one end of the crankshaft extends into the cam chamber lower channel and is sleeved with a timing gear on the outside, the timing gear cooperates with the rocker arm shift block, the The rocker arm shift block cooperates with the cam gear, the cam gear is connected to the lower end of the push rod, the upper end of the push rod is connected to one end of the valve rocker arm, and the other end of the valve rocker arm cooperates with the intake valve and the exhaust valve. The crankshaft is provided with an oil and gas channel on the end in the cam chamber, one end of the oil and gas channel is connected with the crankshaft chamber, and the other end is connected with the lower channel of the cam chamber. A reed baffle and a reed are installed below the crankshaft chamber, and the reed baffle and the reed are installed below the crankshaft opening. A damping hole is provided on the piston cavity, and the damping hole is connected with the crankshaft chamber. An intake port and an exhaust port are also provided on the cylinder body. The intake port is connected with an intake duct, and the intake duct is connected with the intake valve to form an intake airflow forming chamber, and the intake airflow forming chamber is connected with the combustion chamber. The exhaust port is connected with an exhaust duct, and the exhaust duct is connected with the exhaust valve to form an exhaust airflow chamber.

[0013] As an improvement: the gasoline engine body also includes a magneto flywheel installed on the crankshaft, the magneto flywheel is located on the side of the crankshaft away from the cam chamber, a magneto high-voltage package is installed above the magneto flywheel, and a spark plug is installed above the magneto high-voltage package.

[0014] As an improvement: a piston is provided in the piston chamber, and the piston is connected to the crankshaft through a piston connecting rod.

[0015] As an improvement: the air inlet duct is a tangential air duct, the air inlet airflow forming chamber is an air duct with a spiral structure, and the exhaust duct is an open air duct.

[0016] Compared with the prior art, the advantages of the present invention are: Under the same displacement, the gasoline engine has the following advantages: 1. Light weight. The crankshaft chamber has an oil-gas circulation power chamber structure with heat dissipation blades, a top-mounted siphon-type vortex lubrication, cooling, and a valve chamber structure, which have a high degree of integration, integrate and reduce components, and have a compact structure, which reduces the weight of the whole machine and has a large structural rigidity. During use, light weight and small size are generally required while ensuring power, so that it is convenient to operate. This is very important for the portability of the machine, as well as saving resources and reducing energy consumption. Compared with gasoline engines of the same displacement produced by other companies, it has an absolute advantage in quality.

[0017] 2. Low fuel consumption: This gasoline engine continuously optimizes the valve timing and reasonably arranges the combustion chamber during the design stage.

[0018] 3. High power. The air intake of this project is set on the top side of the cylinder body, and the air intake duct and air intake shape are optimized. Advantages: sufficient air intake, stable crankcase air pressure, and effectively improve the power and torque of the engine under the same displacement.

[0019] 4. Low original emission value. When the gasoline engine is working, the pressure difference at the throat is stabilized through the refined structural design, which determines the opening of the cone valve and the pressure difference on both sides of the fuel orifice, and provides the engine with fuel with a constant air-fuel ratio. This plays a decisive role in significantly reducing fuel consumption and HC emission control. The original emission value can fully meet the emission requirements of domestic and foreign markets as well as the European and American markets. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a four-stroke gasoline engine that uses mixed oil fuel for combustion and lubrication according to the present invention;

[0021] Figure 2 This is a schematic structural diagram of a valve chamber of a four-stroke gasoline engine that uses a mixed oil fuel for combustion and lubrication according to the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of an air intake-exhaust port of a four-stroke gasoline engine that uses a mixed oil fuel for combustion and lubrication according to the present invention;

[0023] Reference table of reference numerals:

[0024] 1. Valve rocker arm, 2. Valve cover, 3. Valve spring, 4. Push rod, 5. Cam gear, 6. Rocker arm shifter, 7. Timing gear, 8. Crankshaft, 9. Reed baffle, 10. Reed, 11. Magneto flywheel, 12. Piston, 13. Magneto high-voltage package, 14. Spark plug, 15. Intake valve, 16. Exhaust valve;

[0025] a1, air inlet, a2, air inlet duct, a3, air inlet air flow forming chamber, a4, exhaust air flow chamber, a5 exhaust duct, a6 exhaust outlet;

[0026] b1, cam chamber upper channel, b2, oil and gas channel, b3, air storage chamber, b4, cam chamber lower channel, b5, crankshaft chamber, b6, damping hole. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0028] like Figure 1-3 As shown, a four-stroke gasoline engine that uses mixed oil fuel for combustion and lubrication includes a gasoline engine body, the gasoline engine body includes a cylinder body, a valve chamber, a cam chamber, a crank chamber and a piston chamber are arranged in the cylinder body, the valve chamber, the cam chamber, the crank chamber b5, the piston chamber and the combustion chamber are connected in sequence, the valve chamber is located at the top of the cylinder body and is equipped with a valve rocker arm 1, a valve spring 3, a push rod 4, an intake valve 15 and an exhaust valve 16, the cam chamber is equipped with a cam gear 5 and a rocker arm shift block 6, the cam chamber includes a cam chamber upper channel b1, an air storage chamber b3 and a cam chamber lower channel b4, the cam chamber lower channel b4 is connected with the crank chamber b5, and a power chamber is formed, a crankshaft 8 is installed in the crank chamber, one end of the crankshaft 8 extends into the cam chamber lower channel b4 and a timing gear 7 is sleeved on the outside, the timing gear cooperates with the rocker arm shift block 6, the rocker arm shift block 6 cooperates with the cam gear 5, the cam gear 5 and the push rod 4 The lower end is connected, the upper end of the push rod 4 is connected to one end of the valve rocker arm 1, and the other end of the valve rocker arm 1 cooperates with the intake valve 15 and the exhaust valve 16. The end of the crankshaft 8 in the cam chamber is provided with an oil and gas passage b2, one end of the oil and gas passage b2 is connected to the crankshaft chamber b5, and the other end is connected to the lower channel b4 of the cam chamber. A reed baffle 9 and a reed 10 are installed below the crankshaft chamber b5, and the reed baffle 9 and the reed 10 are installed below the opening of the crankshaft 8. The piston chamber is provided with a damping hole b6, and the damping hole b6 is connected to the crankshaft chamber b5. The cylinder body is also provided with an intake port a1 and an exhaust port a6. The intake port a1 is connected with an intake duct a2, and the intake duct a2 is connected with the intake valve 15 to form an intake airflow forming chamber a3, and the intake airflow forming chamber a3 is connected with the combustion chamber. The exhaust port a6 is connected with an exhaust duct a5, and the exhaust duct a5 is connected with the exhaust valve to form an exhaust airflow chamber a4.

[0029] The gasoline engine body also includes a magneto flywheel 11 installed on the crankshaft 8, the magneto flywheel 11 is located on the side of the crankshaft 8 away from the cam chamber, a magneto high-voltage package 13 is installed above the magneto flywheel 11, and a spark plug 14 is installed above the magneto high-voltage package 13.

[0030] A piston 12 is provided in the piston chamber, and the piston 12 is connected to the crankshaft 8 via a piston connecting rod.

[0031] The air inlet a2 is a tangential airway, the air inlet airflow forming chamber a3 is an airway with a spiral structure, and the exhaust duct a5 is an open airway.

[0032] In the specific implementation of the present invention, the present invention adopts the structure of overhead siphon vortex lubrication, cooling and valve chamber, and its working process is: under the rotation of crankshaft 8, the timing gear 7 transmits power to rocker arm shift block 6 and shifts cam gear 5 at a fixed time, and push rod 4 pushes valve rocker arm 1 upward under the push of cam gear 5, and valve rocker arm 1 rotates around the axis to press intake valve 15 and exhaust valve 16 to form intake and exhaust, and piston 12 runs up and down, and the atmospheric pressure difference with intake port a1 is used, so that The oil mist mixture is effectively sucked into the intake duct a2 from the intake port a1, and the intake duct a2 enters the intake air flow forming chamber a3 in the tangential direction of the intake air flow forming chamber a3 to form a gas vortex, while cooling and lubricating the intake valve 15. The negative pressure formed when the piston 12 moves downward opens the intake valve 15, and the vortex formed in the intake air flow forming chamber a3 is sucked into the combustion chamber. The high voltage electricity generated by the magneto flywheel 11 and the magneto high-voltage package 13 releases electric sparks through the spark plug 14 to ignite the mixed gas.

[0033] In the structure of the present invention, the intake passage a2 is a tangential air passage, guiding the airflow to enter the cylinder in a single-sided tangential direction, thereby forming an intake vortex. The intake airflow forming chamber a3 is an air passage with a spiral structure, and the valve cavity above the valve seat is made into a spiral shape, so that the airflow forms a certain intensity of rotation in the spiral air passage, thereby forming a strong intake vortex. The exhaust passage a5 is an open air passage, so that the airflow in the air passage can be discharged smoothly.

[0034] The present invention adopts a timed pulse jet crankshaft structure, and its working principle is: the crankshaft 8 is provided with an oil and gas channel b2 with openings at both ends, one end of the opening is arranged in the crankshaft chamber b5, and the other end is arranged in the lower channel b4 of the cam chamber. The opening of the lower channel b4 of the cam chamber is a sector with an angle of 30 degrees. The crankshaft 8 rotates around the central axis, and the crankshaft 8 forms a passage within a given time. The passage can provide oil mist mixed gas to the crankshaft chamber b5 in a timely and quantitative manner to provide cooling and lubrication of the crankshaft 8 and the piston 12.

[0035] The present invention designs an oil-gas circulation power chamber structure, by adding a reed 10 to the opening of the crankshaft 8, the reed baffle 9 protects the reed 10 from opening too large, the crankshaft chamber b5 is connected with the lower channel b4 of the cam chamber, and the oil-gas circulation power is formed. Its working principle is: the piston 12 moves upward, the reed 10 is closed, when the piston 12 reaches and passes over the damping hole b6, the crankshaft 8 closes the oil-gas channel b2 to provide oil mist mixed gas, the power chamber is connected with the damping hole b6, and the oil mist mixed gas enters the crankshaft chamber b5 regularly, quantitatively and evenly through the damping hole b6 of the crankshaft 8, A lubricating film is formed on the inner wall of the crank chamber b5 to cool and lubricate the piston 12 and the crankshaft 8. When the piston 12 moves downward, the reed 10 can be completely pushed open by the positive pressure in the crank chamber b5, and the high-temperature and high-pressure oil mist mixture in the crank chamber b5 is pushed into the lower channel b4 of the cam chamber. The lower side of the lower channel b4 of the cam chamber is provided with heat dissipation blades, which take away the high temperature through the external cooling wind. The cooled oil mist mixture is briefly cooled and stored in the lower channel b4 of the cam chamber, and then sent to the upper channel b1 of the cam chamber to continue to lubricate the cam gear 5 and the rocker arm shift block 6.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A four-stroke gasoline engine that uses mixed oil fuel for combustion and lubrication, comprising a gasoline engine body, the gasoline engine body comprising a cylinder body, the cylinder body is provided with a valve chamber, a cam chamber, a crank chamber and a piston chamber, the valve chamber, the cam chamber, the crank chamber (b5), the piston chamber and the combustion chamber are connected in sequence, characterized in that: The valve chamber is located at the top of the cylinder body and is equipped with a valve rocker arm (1), a valve spring (3), a push rod (4), an intake valve (15) and an exhaust valve (16); the cam chamber is equipped with a cam gear (5) and a rocker arm shift block (6); the cam chamber includes an upper channel (b1) of the cam chamber, an air storage chamber (b3) and a lower channel (b4) of the cam chamber; the lower channel (b4) of the cam chamber is connected with the crankshaft chamber (b5) to form a power chamber; a crankshaft (8) is installed in the crankshaft chamber; one end of the crankshaft (8) extends into the lower channel (b4) of the cam chamber and is sleeved with a timing gear (7) on the outside ), the timing gear cooperates with the rocker arm shift block (6), the rocker arm shift block (6) cooperates with the cam gear (5), the cam gear (5) is connected to the lower end of the push rod (4), the upper end of the push rod (4) is connected to one end of the valve rocker arm (1), the other end of the valve rocker arm (1) cooperates with the intake valve (15) and the exhaust valve (16), the end of the crankshaft (8) in the cam chamber is provided with an oil and gas channel (b2), one end of the oil and gas channel (b2) is connected to the crankshaft chamber (b5), and the other end is connected to the lower channel (b4) of the cam chamber, and the crankshaft chamber (b5) is provided with a A reed baffle (9) and a reed (10), wherein the reed baffle (9) and the reed (10) are mounted in cooperation below the opening of the crankshaft (8), a damping hole (b6) is provided on the piston chamber, and the damping hole (b6) is communicated with the crankshaft chamber (b5), and an intake port (a1) and an exhaust port (a6) are also provided on the cylinder body, wherein the intake port (a1) is connected to an intake passage (a2), and the intake passage (a2) is communicated with an intake valve (15) to form an intake airflow forming chamber (a3), and the intake airflow forming chamber (a3) ​​is communicated with the combustion chamber, and the exhaust port (a6) is connected to an exhaust port (a1). The gasoline engine body further comprises a magneto flywheel (11) mounted on the crankshaft (8), the magneto flywheel (11) being located on the side of the crankshaft (8) away from the cam chamber, a magneto high-voltage package (13) being mounted above the magneto flywheel (11), a spark plug (14) being mounted above the magneto high-voltage package (13), the intake duct (a2) being a tangential air duct, the intake air flow forming chamber (a3) ​​being an air duct with a spiral structure, and the exhaust duct (a5) being an open air duct.

2. A four-stroke gasoline engine that uses mixed oil fuel for combustion and lubrication according to claim 1, characterized in that: A piston (12) is arranged in the piston chamber, and the piston (12) is connected to the crankshaft (8) via a piston connecting rod.

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