Engine mounted on variable frequency generator

Abstract

The engine carried on the variable frequency generator comprises a rocker arm type cylinder head, an air cooling assembly and an oil cooling assembly, and the rocker arm type cylinder head comprises an air inlet rocker arm, an air inlet rocker arm shaft, an exhaust rocker arm, an exhaust rocker arm shaft and a rocker arm shaft check block; the air cooling assembly comprises a first air guide block, a second air guide block, an exhaust upper side cooling fin, an exhaust lower side cooling fin and a box body cylinder sleeve cooling fin, the first air guide block can divide air flow up and down, and the second air guide block can guide the air flow blown out of the box body cylinder sleeve cooling fin upwards and blow the air flow to a cylinder head; the oil cooling assembly comprises a box cover oil duct arranged on the crankcase cover, and the box cover oil duct is sequentially communicated with the oil inlet, the box cover end cam shaft hole and the box cover end crankshaft hole. Deformation of the rocker arm type cylinder head base can be reduced, air flow can be guided, the situation that the heat dissipation effect is affected due to disordered flowing of the air flow is avoided, the camshaft oil duct capable of improving the lubricating and cooling effect is formed in the crankcase cover, and the oil return hole capable of storing engine oil is formed in the crankshaft.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an engine mounted on a variable-frequency generator. Background Art

[0002] A variable-frequency generator is a generator capable of changing the output frequency. The engine mounted on the variable-frequency generator operates at a high speed, which helps to reduce the weight and volume. A large amount of heat will be generated during its operation. If the heat dissipation is poor, it will cause the engine temperature to be too high, affecting its normal operation and even possibly damaging the equipment, especially the damage of the rocker-type cylinder head. The main function of the rocker-type cylinder head is to convert the rotational motion of the crankshaft or camshaft into the opening and closing motion of the valve. The rocker not only transmits force but also bears a large bending moment, so it needs to have sufficient strength and stiffness. When the engine runs continuously at a high speed, the rocker shaft on the base will rotate and axially move. The continuous friction and high temperature cause the rocker base of the gasoline generator cylinder head to deform. The shaft hole on the base for the rocker shaft to pass through is easily out-of-round at high temperatures, and even the base at the exhaust end may break.

[0003] The heat dissipation system of the engine generally adopts air cooling or oil cooling. Air cooling effectively discharges the heat generated inside the equipment by guiding and controlling the air flow, thereby reducing the equipment temperature, ensuring its stable operation and extending its service life. Oil cooling can reduce the friction of moving parts and prevent wear caused by friction, thereby extending the service life of the engine. When the engine oil flows between moving parts, it takes away part of the heat for heat dissipation. However, some existing heat dissipation systems lack the guidance of the air flow, making it easy for the air flow to form eddies inside the engine and difficult to discharge, which greatly affects the heat dissipation effect. Moreover, the air flow is difficult to enter the lower part of the engine for heat dissipation. At the same time, the oil cooling adopts splash lubrication and sets an oil passage at the crankshaft for lubrication, often neglecting the lubrication of the end of the camshaft. Summary of the Utility Model

[0004] Aiming at the defects existing in the above-mentioned prior art, the technical problem to be solved by the utility model is to provide an engine mounted on a variable-frequency generator, which can not only reduce the deformation of the rocker-type cylinder head base, but also guide the air flow to avoid the chaotic flow of the air flow, thus affecting the heat dissipation effect. In addition, a camshaft lubricating oil passage capable of improving the lubrication and cooling effect is arranged in the crankcase cover, and an oil return hole capable of accumulating engine oil is arranged at the crankshaft.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions: An engine mounted on a variable-frequency generator, including a rocker-type cylinder head, an air-cooling component, and an oil-cooling component. The rocker-type cylinder head includes an intake rocker, an intake rocker shaft, an exhaust rocker, an exhaust rocker shaft, and a rocker shaft stopper disposed between the two rockers. The rocker shaft stopper is screwed and installed on the cylinder head housing through bolts. The inner ends of the intake rocker shaft and the exhaust rocker shaft are respectively blocked on the rocker shaft stopper. When the two rockers work and swing, the rocker shaft stopper can be forced to rotate under the action of the two rocker shafts, and a limiting column is provided on the rotating side of the rocker shaft stopper;

[0006] The air-cooling component includes a first air guide block, a second air guide block, an exhaust upper-side heat sink, an exhaust lower-side heat sink, and a cylinder liner heat sink of the box body. The first air guide block is disposed on the starting large cover and is located below the engine air intake and flush with the engine air intake, and can shunt the air flow up and down, so that the upward air flow goes to the exhaust upper-side heat sink, and the downward air flow goes to the exhaust lower-side heat sink; The second air guide block is disposed on the muffler partition between the cylinder liner heat sink of the box body and the muffler outer cover, and can guide the air flow blown out by the cylinder liner heat sink of the box body upward to blow to the cylinder head;

[0007] The oil-cooling component includes an oil passage on the crankcase cover. The oil passage on the crankcase cover is sequentially connected to an oil inlet, a camshaft hole at the end of the crankcase cover, and a crankshaft hole at the end of the crankcase cover. A oil pump component is provided between the camshaft hole at the end of the crankcase cover and the oil inlet; A crankcase cover end oil return hole is communicated with the bottom of the crankshaft hole at the end of the crankcase cover. The crankcase cover end oil return hole is upwardly disposed on the front of the crankcase cover so that the engine oil can accumulate in the crankshaft hole at the end of the crankcase cover for lubrication; An annular crankshaft oil groove is provided in the crankshaft hole at the end of the crankcase cover and the crankshaft oil groove is communicated with the oil passage on the crankcase cover. The crankshaft oil groove is communicated with a crankshaft oil groove pressure relief hole disposed on the front of the crankcase cover facing the engine piston. When lubricating, the engine oil can be sprayed out from the crankshaft oil groove pressure relief hole to lubricate the engine piston.

[0008] Preferably, the outer end of the exhaust rocker shaft extends to the cylinder head housing and is fixed by the housing. A hollow column protruding outward is provided on the cylinder head housing. The outer end of the exhaust rocker shaft is fixed by inserting into the hollow column, strengthening the fixation of the exhaust rocker shaft and reducing the working intensity of the base.

[0009] Preferably, the inner ends of the intake rocker shaft and the exhaust rocker shaft are both semi-circular shafts, and the vertical surfaces are tightened by the rocker shaft stopper. L-shaped baffles bent upward are provided at the tightening places of the rocker shaft stopper.

[0010] Preferably, the width of the cylinder liner heat sink of the box body decreases sequentially from top to bottom in a stepped distribution, which can make the engine lightweight, and the second air guide block is parallel to the hypotenuse of the cylinder liner heat sink of the box body, and can better guide the air flow blown out by the cylinder liner heat sink of the box body upward to blow to the cylinder head.

[0011] Preferably, the oil cooling assembly further includes a crankcase oil passage disposed within the crankcase. The crankcase oil passage communicates with both ends of the crankshaft assembly and the camshaft assembly, and a crankcase end pressure relief hole is provided on the crankcase oil passage. When the engine oil sprays out from the crankcase end pressure relief hole, it splashes onto the engine camshaft sprocket, better improving the lubrication efficiency of the engine. The circulating system takes away part of the heat, contributing to heat dissipation.

[0012] Preferably, an engine oil filter screen is provided at the oil inlet of the crankcase cover oil passage for filtering engine oil impurities.

[0013] Preferably, the crankcase oil passage is provided with two external connection holes. When performing internal circulation, both external connection holes are blocked by plugs. When performing external circulation, the two external connection holes are connected to the engine oil cooler.

[0014] Preferably, when the crankcase cover oil passage communicates with the crankcase cover end camshaft hole and the crankcase cover end crankshaft hole, it penetrates through the crankcase cover. A plug is provided at the end of the oil passage of the crankcase cover oil passage passing through the crankcase cover end camshaft hole. An oil passage pressure sensor installation position is provided at the end of the oil passage of the crankcase cover oil passage passing through the crankcase cover end crankshaft hole, and the oil passage of the crankcase cover oil passage passing through the crankcase cover end crankshaft hole is arranged upward. The oil passage pressure sensor is provided on the upper part of the crankcase cover.

[0015] Preferably, the first air guiding block and the starting large cover are integrally formed, and the second air guiding block and the muffler partition are integrally formed, making the connection more reliable and the overall force better.

[0016] The beneficial effects of the present utility model are as follows:

[0017] 1) By providing a stopper that can abut against the inner ends of the exhaust rocker arm shaft and the intake rocker arm shaft, the fixation of the rocker arm shaft is improved, thereby reducing the rotation of the rocker arm shaft caused by the operation of the rocker arm, alleviating the out-of-roundness of the shaft hole on the base through which the rocker arm shaft passes under high temperature and the rotation of the rocker arm shaft, avoiding the fracture of the base, and improving the working efficiency and working safety of the rocker arm;

[0018] 2) The stopper can be rotated under the action of the two rocker arm shafts and is limited and fixed by the limit post, and it is not easy to rotate due to the applied force when the stopper limits and abuts against the two rocker arm shafts, thus avoiding limiting and fixing only one side of the rocker arm shaft;

[0019] 3) By providing the first air guiding block on the starting large cover, the air flow can be shunted up and down. The upward air flow is guided to the spark plug and blows towards the cylinder head exhaust fins to cool the upper exhaust fins. The downward air flow blows over the top of the combustion chamber to cool the top of the combustion chamber and the lower exhaust fins. To avoid the formation of eddies due to the scattering of the air flow, which is difficult to discharge;

[0020] 4) The second air guide block arranged on the muffler baffle guides the airflow blown out from the cooling fins of the cylinder liner to the cylinder head, so that the airflow blows the cooling fins of the cylinder liner in a concentrated manner, which has a good cooling effect and prevents the airflow from running around between the engine and the muffler, thereby affecting the heat dissipation effect;

[0021] 5) Lubrication of the camshaft and the crankshaft end is achieved by providing a case cover oil passage on the case cover that connects the camshaft hole at the case cover end and the crankshaft hole at the case cover end. An upward slanting oil return hole is provided at the bottom of the crankshaft end so that the engine oil can accumulate at the crankshaft end for lubrication, and a crankshaft oil tank pressure relief hole is provided for splashing lubrication. Furthermore, the case body oil passage can achieve internal circulation or external circulation, and splashing lubrication is performed on the gears through the case body end pressure relief hole, thereby better improving the lubrication efficiency of the engine. The circulation system takes away part of the heat, which helps to dissipate heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the engine;

[0023] Figure 2 This is the left side view of the engine;

[0024] Figure 3 for Figure 2 Bottom view of

[0025] Figure 4 It is a structural schematic diagram of the box cover;

[0026] Figure 5 for Figure 4 A top view of

[0027] Figure 6 for Figure 5 AA section view;

[0028] Figure 7 for Figure 5 BB cross-sectional view;

[0029] Figure 8 It is a structural schematic diagram of the oil passage of the tank cover;

[0030] Figure 9 for Figure 8 EE cross-sectional view;

[0031] Figure 10 for Figure 8 FF cross-sectional view;

[0032] Figure 11 It is a structural schematic diagram of the oil passage of the box body;

[0033] Figure 12 It is a front sectional view of the engine;

[0034] Figure 13 It is a right side sectional view of the engine;

[0035] In the figure: 1 - rocker shaft stopper, 2 - intake rocker arm, 3 - intake rocker shaft, 4 - exhaust rocker arm, 5 - exhaust rocker shaft, 6 - muffler partition, 7 - cylinder head air guide cover, 8 - starting large cover, 9 - engine bottom plate, 10 - limit post, 11 - crankcase cover, 12 - cover oil passage, 13 - crankshaft assembly, 14 - camshaft assembly, 15 - oil pump assembly, 16 - oil filter screen, 17 - oil passage pressure sensor installation position, 18 - crankcase cover end oil return hole, 19 - crankshaft oil groove, 20 - crankshaft oil groove pressure relief hole, 21 - cover end camshaft hole, 22 - housing oil passage, 23 - main oil passage pressure relief hole, 24 - housing end crankshaft oil return hole, 25 - plug, 26 - housing end pressure relief hole, 27 - cover end crankshaft hole, 28 - muffler outer cover, 29 - first air guide block, 30 - second air guide block, 31 - engine air intake, 32 - housing cylinder liner heat sink fins. Specific embodiments

[0036] In order to better understand the improvements made by the present utility model over the prior art, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0037] As Figure 1 shown, the engine mounted on the variable frequency generator mainly consists of an air cooling component and an oil cooling component to form a heat dissipation system. When the temperature is too high, the rocker type cylinder head is easily damaged.

[0038] As Figure 2 shown, the rocker type cylinder head mainly consists of an intake rocker arm 2, an intake rocker shaft 3, an exhaust rocker arm 4, an exhaust rocker shaft 5, and a rocker shaft stopper 1 arranged between the two rocker arms. The intake rocker shaft 3 and the exhaust rocker shaft 5 are both inserted obliquely with the front end higher than the rear end into the shaft holes on the base for the rocker shaft to pass through. The two rocker arms are respectively installed on the corresponding base of the cylinder head housing through the exhaust rocker shaft 2 and the intake rocker shaft 5.

[0039] To strengthen the fixation of the exhaust rocker shaft 5, the outer end of the exhaust rocker shaft 5 extends to the cylinder head housing and is fixed by the housing. There is a hollow column protruding outward on the cylinder head housing, and the outer end of the exhaust rocker shaft 5 is fixed by inserting it into the hollow column. The rocker shaft stopper 1 is installed on the cylinder head housing by screwing bolts. The inner ends of the intake rocker shaft 3 and the exhaust rocker shaft 5 are respectively blocked on the rocker shaft stopper 1. The inner ends of the intake rocker shaft 3 and the exhaust rocker shaft 5 are both semi-circular shafts, and the vertical surfaces are tightened by the rocker shaft stopper 1. L-shaped baffles bent upward are provided at the tightening positions of the rocker shaft stopper 1.

[0040] The rocker shaft blocks 1 are all pressed against the right side of the exhaust rocker shaft 5 and the left side of the intake rocker shaft 3. For the convenience of installation, the block 4 is fixedly installed on the cylinder head through a right-handed bolt. When the rocker swings and sways during operation, the exhaust rocker shaft 5 and the intake rocker shaft 3 are limited and fixed by the rocker shaft blocks 1. The rocker shaft blocks 1 are forced to rotate under the action of the two rocker shafts, and a limiting post 10 is arranged on the rotating side of the rocker shaft blocks 1, so as to realize the limitation of the exhaust rocker shaft 5 and the intake rocker shaft 3, and the rocker shaft blocks 1 are not easily rotated due to force, resulting in only limiting and fixing one side of the rocker shaft, reducing the out-of-roundness of the shaft hole on the base through which the rocker shaft passes under high temperature and the rotation of the rocker shaft, avoiding the fracture of the base, and improving the working efficiency and working safety of the rocker.

[0041] As Figure 3 , 12 , as shown in 13, the air-cooling assembly mainly consists of a first air guide block 29, a second air guide block 30, an exhaust upper-side heat sink, an exhaust lower-side heat sink, and a cylinder liner heat sink 32 of the box body. The first air guide block 29 and the second air guide block 30 are respectively arranged on the starting large cover 8 and the muffler partition 6 between the cylinder liner heat sink 32 of the box body and the muffler outer cover 28, and are both integrally formed, making the connection more reliable and the overall force better.

[0042] The first air guide block 29 is arranged on the starting large cover 8 and is located below the engine air intake 31 and flush with the engine air intake 31, and can divide the air flow up and down, so that the upward air flow goes to the exhaust upper-side heat sink, and the downward air flow goes to the exhaust lower-side heat sink. When the starting large cover 8 guides the cooling air to the bottom of the box body, the cooling air passes through the air duct formed by the starting large cover 8 and the engine bottom plate 9, and fully takes away the heat accumulated at the bottom of the box body to achieve the purpose of reducing the engine oil temperature. The first air guide block 29 on the starting large cover 8 divides the air intake of the cylinder head into upper and lower parts. The upper part of the air is guided by the first air guide block 29 to the spark plug and blows the air to the cylinder head exhaust heat sink, mainly cooling the exhaust upper-side heat sink. The lower part of the air is guided by the first air guide block 30 to blow over the top of the combustion chamber, mainly cooling the top of the combustion chamber and the exhaust lower-side heat sink.

[0043] The width of the cylinder liner heat sink 32 of the box body decreases step by step from top to bottom, which can make the engine lighter. The second air guide block 30 is inclined from bottom to top towards the muffler outer cover 28 side. Preferably, the second air guide block 30 is parallel to the hypotenuse of the cylinder liner heat sink 32 of the box body, and the upper end of the second air guide block 30 extends to the middle and upper part of the cylinder liner heat sink 32, which can better guide the air flow blown out by the cylinder liner heat sink 32 of the box body upwards to the cylinder head.

[0044] The oil cooling assembly mainly consists of a crankcase cover oil passage 12 provided on the crankcase cover 11 and a crankcase body oil passage 22 provided in the crankcase body. Inside the crankcase cover 11, there are a camshaft hole 21 at the cover end and a crankshaft hole 27 at the cover end for installing the camshaft assembly 14 and the crankshaft assembly 13.

[0045] As Figure 4 , 5 shown, the crankcase cover oil passage 12 is sequentially connected to the oil inlet, the camshaft hole 21 at the cover end, and the crankshaft hole 27 at the cover end. There is an oil pump assembly 15 between the camshaft hole 21 at the cover end and the oil inlet. An oil filter screen 16 is provided at the oil inlet of the crankcase cover oil passage 12 to filter oil impurities. As Figure 6 shown, along the direction of oil flow, the main oil passage relief hole 23 is provided behind the oil pump assembly 15, and the main oil passage relief hole 10 adopts a spring-type relief component. As Figure 8 shown, when the crankcase cover oil passage 12 is connected to the camshaft hole 21 at the cover end and the crankshaft hole 27 at the cover end, it penetrates through the crankcase cover. A plug is provided at the end of the oil passage of the crankcase cover oil passage passing through the camshaft hole 21 at the cover end. An oil passage pressure sensor installation position 17 is provided at the end of the oil passage of the crankcase cover oil passage passing through the crankshaft hole 27 at the cover end. The oil passage of the crankcase cover oil passage passing through the crankshaft hole 27 at the cover end is arranged upward. The oil passage pressure sensor is provided on the upper part of the crankcase cover 11. The oil pressure of the oil passage is detected by the oil passage pressure sensor. When the oil is too little or the oil passage pressure is too low, a signal is sent to the alarm to achieve the purpose of shutting down the engine.

[0046] As Figure 10 shown, a crankcase cover end oil return hole 18 is connected to the bottom of the crankshaft hole 27 at the cover end. The crankcase cover end oil return hole 18 is arranged upward on the front of the crankcase cover so that the oil can accumulate in the crankshaft hole 27 at the cover end for lubrication, strengthening the lubrication effect. When the oil accumulates to full, it flows out from the crankcase cover end oil return hole 18. As Figure 7 shown, an annular crankshaft oil groove 19 is provided in the crankshaft hole 27 at the cover end, and the crankshaft oil groove 19 is connected to the crankcase cover oil passage 12. As Figure 9 shown, the crankshaft oil groove 19 is connected to a crankshaft oil groove relief hole 20 provided on the front of the crankcase cover facing the engine piston. During lubrication, the oil can be ejected from the crankshaft oil groove relief hole 20 to lubricate the engine piston.

[0047] As Figure 11As shown, the crankcase oil passage 22 is a circulating oil passage provided inside the engine and communicates with both ends of the crankshaft assembly 13 and the camshaft assembly 14. A crankcase end pressure relief hole 26 is provided on the crankcase oil passage. When the engine oil sprays out from the crankcase end pressure relief hole 26, it splashes onto the engine camshaft sprocket, and the camshaft throws out the splashed engine oil to lubricate each moving pair inside the crankcase. The crankcase oil passage 22 can carry out the internal circulation of the engine or be connected to an engine oil cooler for external circulation. The two circulation modes of the crankcase oil passage 22 are realized through two external connection holes. When carrying out internal circulation, both external connection holes are blocked by plugs 25. When carrying out external circulation, the two external connection holes are connected to the engine oil cooler, and the circulation system takes away part of the heat, which helps with heat dissipation.

[0048] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. An engine mounted on a variable-frequency generator, comprising a rocker-type cylinder head, an air-cooling assembly and an oil-cooling assembly, characterized in that: The rocker - type cylinder head includes an intake rocker (2), an intake rocker shaft (3), an exhaust rocker (4), an exhaust rocker shaft (5), and a rocker shaft stopper (1) disposed between the two rockers. The rocker shaft stopper (1) is screwed and installed on the cylinder head housing through bolts. The inner ends of the intake rocker shaft (3) and the exhaust rocker shaft (5) are respectively blocked on the rocker shaft stopper (1). When the two rockers swing and shake during operation, the rocker shaft stopper (1) can be forced to rotate under the action of the two rocker shafts, and a limiting post (10) is provided on the rotating side of the rocker shaft stopper (1). The air - cooling assembly includes a first air - guiding block (29), a second air - guiding block (30), upper - side exhaust heat dissipation fins, lower - side exhaust heat dissipation fins, and cylinder - sleeve heat dissipation fins of the housing (32). The first air - guiding block (29) is disposed on the starting large cover (8) and is located below and flush with the engine air intake port (31), and can conduct up - and - down diversion of the air flow, so that the upward air flow goes to the upper - side exhaust heat dissipation fins, and the downward air flow goes to the lower - side exhaust heat dissipation fins. The second air - guiding block (30) is disposed on the muffler partition (6) between the cylinder - sleeve heat dissipation fins of the housing (32) and the muffler outer cover (28), and can guide the air flow blown out from the cylinder - sleeve heat dissipation fins of the housing (32) upward to the cylinder head. The oil - cooling assembly includes an oil passage in the crankcase cover (11), which is the crankcase - cover oil passage (12). The crankcase - cover oil passage (12) is sequentially connected to an oil inlet, a camshaft hole at the crankcase - cover end (21), and a crankshaft hole at the crankcase - cover end (27). A oil pump assembly (15) is provided between the camshaft hole at the crankcase - cover end (21) and the oil inlet. The bottom of the crankshaft hole at the crankcase - cover end (27) is connected to a crankcase - cover - end oil return hole (18), and the crankcase - cover - end oil return hole (18) is upwardly disposed on the front of the cover so that engine oil can accumulate in the crankshaft hole at the crankcase - cover end (27) for lubrication. An annular crankshaft oil groove (19) is provided in the crankshaft hole at the crankcase - cover end (27), and the crankshaft oil groove (19) is connected to the crankcase - cover oil passage (12). The crankshaft oil groove (19) is connected to a crankshaft - oil - groove pressure - relief hole (20) facing the engine piston on the front of the cover. During lubrication, engine oil can be ejected from the crankshaft - oil - groove pressure - relief hole (20) to lubricate the engine piston.

2. The engine mounted on the variable frequency generator according to claim 1, characterized in that: The outer end of the exhaust rocker shaft (5) extends to the cylinder head housing and is fixed by the housing. There is a hollow column protruding outward on the cylinder head housing, and the outer end of the exhaust rocker shaft (5) is fixed by inserting it into the hollow column.

3. The engine mounted on the variable frequency generator according to claim 1, characterized in that: The inner ends of the intake rocker shaft (3) and the exhaust rocker shaft (5) are both semi - circular shafts, and the vertical surfaces are tightened by the rocker shaft stopper (1). L - shaped baffles bent upward are provided at the tightening positions of the rocker shaft stopper (1).

4. The engine mounted on the variable frequency generator according to claim 2, characterized in that: The width of the cylinder - sleeve heat dissipation fins of the housing (32) decreases step - by - step from top to bottom, which can make the engine lighter, and the second air - guiding block (30) is parallel to the hypotenuse of the cylinder - sleeve heat dissipation fins of the housing (32).

5. The engine mounted on the variable-frequency generator according to claim 1, characterized in that: The oil cooling component further includes a crankcase oil passage (22) disposed in the crankcase. The crankcase oil passage (22) communicates with both ends of the crankshaft assembly (13) and the camshaft assembly (14), and a crankcase end pressure relief hole (26) is provided in the crankcase oil passage. When the engine oil sprays out from the crankcase end pressure relief hole (26), it splashes onto the engine camshaft sprocket.

6. The engine mounted on the variable frequency generator according to claim 1, characterized in that: An engine oil filter screen (16) is provided at the oil inlet of the crankcase cover oil passage (12) for filtering engine oil impurities.

7. The engine mounted on the variable frequency generator according to claim 5, characterized in that: Two external connection holes are provided in the crankcase oil passage. When performing internal circulation, both external connection holes are blocked by plugs (25). When performing external circulation, the two external connection holes are connected to the engine oil cooler.

8. The engine mounted on the variable-frequency generator according to claim 1, characterized in that: When the crankcase cover oil passage (12) communicates with the crankcase cover end camshaft hole (21) and the crankcase cover end crankshaft hole (27), it penetrates through the crankcase cover. A plug is provided at the end of the oil passage of the crankcase cover oil passage (12) passing through the crankcase cover end camshaft hole (21). An oil passage pressure sensor installation position (17) is provided at the end of the oil passage of the crankcase cover oil passage (12) passing through the crankcase cover end crankshaft hole (27), and the oil passage of the crankcase cover oil passage (12) passing through the crankcase cover end crankshaft hole (27) is arranged upward. The oil passage pressure sensor is provided at the upper part of the crankcase cover (11).

9. The engine mounted on the variable frequency generator according to claim 1, characterized in that: The first air guiding block (29) and the starting large cover (8) are integrally formed, and the second air guiding block (30) and the muffler partition (6) are integrally formed.

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