Small naturally aspirated aviation piston engine lubrication system

Abstract

This invention discloses a lubrication system for a small naturally aspirated aircraft piston engine, comprising an oil tank, an oil pump, an oil tank gasket, an oil supply line connected to the oil pump, an exhaust pipe connected to the oil tank, and an oil inlet pipe connected to both the oil tank and the oil pump. The oil tank and the oil pump are mounted on the oil tank gasket. This small naturally aspirated aircraft piston engine lubrication system features an independent oil tank and a matching oil tank gasket, ensuring sufficient pressure within the oil tank while improving its structural stability and compactness. It also forms a separate lubrication path, which improves both combustion efficiency and lubricating oil utilization efficiency, thereby enhancing engine fuel economy.

Description

Technical Field

[0001] This invention belongs to the field of engine technology, specifically, it relates to a lubrication system for a small naturally aspirated aircraft piston engine. Background Technology

[0002] Mixed lubrication involves first mixing fuel and lubricating oil in a certain ratio (usually 20:1), stirring thoroughly, and then adding it to the fuel tank. The lubricating oil, along with the fuel, atomizes and enters the crankcase and cylinder, adhering to the surfaces of metal parts such as cylinders, pistons, piston rings, connecting rods, and bearings, forming an oil film that provides lubrication.

[0003] In existing hybrid lubrication designs, because engines using hybrid lubrication lack dedicated lubrication mechanisms, the supply of lubricating oil cannot adapt to changes in engine load. At idle, a mixture ratio of approximately 120:1 is sufficient; under medium load, the required lubricating oil is doubled, reaching a ratio of approximately 60:1; and under maximum load, a larger mixture ratio of approximately 25:1 is needed. Since engines mostly operate under light to medium loads, much of the lubricating oil is not fully utilized and is burned with the fuel. This is not only uneconomical but also prone to carbon buildup in the cylinders, leading to quality problems such as cylinder scoring and valve leakage, while also causing significant environmental pollution. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides a lubrication system for a small naturally aspirated aircraft piston engine, with the aim of improving engine fuel economy.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a small naturally aspirated aircraft piston engine lubrication system, including an oil tank, an oil pump, an oil tank pad, an oil supply pipeline connected to the oil pump, an air outlet pipe connected to the oil tank, and an oil inlet pipe connected to the oil tank and the oil pump, wherein the oil tank and the oil pump are mounted on the oil tank pad.

[0006] The oil tank pad has a hollow internal structure, the oil pump is fixedly installed in the inner cavity of the oil tank pad, and the lubricating oil tank is located outside the oil tank pad.

[0007] The oil tank pad includes a first connecting part, a second connecting part, and a third connecting part. The lubricating oil tank is fixedly connected to the first connecting part, the first connecting part is fixedly connected to the second and third connecting parts, the second connecting part is fixedly connected to the third connecting part, and the oil pump is fixedly connected to the second connecting part.

[0008] The oil pump is fixedly connected to the second connecting part by bolts, and the oil pump is located between the first connecting part and the second connecting part.

[0009] The oil supply pipeline includes a first oil pipe connected to the oil pump, a second oil pipe connected to the first oil pipe via a hose connector, and an oil nozzle connected to the second oil pipe.

[0010] Both the first oil pipe and the second oil pipe are flexible hoses.

[0011] The oil pump is a plunger pump.

[0012] The lubrication system for a small naturally aspirated aircraft piston engine of the present invention has an independent oil tank and a matching oil tank gasket, which ensures the pressure inside the oil tank while improving its structural stability and compactness; forming a separate lubrication oil circuit, which improves both combustion efficiency and lubricating oil utilization efficiency, thereby improving engine fuel economy. Attached Figure Description

[0013] This manual includes the following figures, which illustrate the following:

[0014] Figure 1 This is a schematic diagram of the structure of the lubrication system for a small naturally aspirated aircraft piston engine of the present invention;

[0015] Figure 2 This is a schematic diagram of the oil pump structure;

[0016] Figure 3 This is a front view of the lubrication system for a small naturally aspirated aircraft piston engine according to the present invention;

[0017] Figure 4 This is a top view of the lubrication system for a small naturally aspirated aircraft piston engine according to the present invention;

[0018] Figure 5 This is a rear view of the lubrication system for a small naturally aspirated aircraft piston engine according to the present invention.

[0019] The markings in the diagram are: 1. Oil tank; 2. Oil tank pad; 3. Oil pump; 4. Oil inlet pipe; 5. First oil pipe; 6. Oil nozzle; 7. Air outlet pipe; 8. Second oil pipe; 9. Hose connector. Detailed Implementation

[0020] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and to facilitate its implementation.

[0021] It should be noted that in the following embodiments, the terms "first," "second," and "third" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution; they are merely for the convenience of description.

[0022] like Figures 1 to 5 As shown, the present invention provides a lubrication system for a small naturally aspirated aircraft piston engine, including an oil tank 1, an oil pump 3, an oil tank pad 2, an oil supply line connected to the oil pump 3, an exhaust pipe 7 connected to the oil tank 1, and an oil inlet pipe 4 connected to the oil tank 1 and the oil pump 3. The oil tank 1 stores lubricating oil, and the oil tank 1 and the oil pump 3 are mounted on the oil tank pad 2.

[0023] Specifically, such as Figures 1 to 5 As shown, the oil supply line includes a first oil pipe 5 connected to the oil pump 3, a second oil pipe 8 connected to the first oil pipe 5 via a hose connector 9, and an oil nozzle 6 connected to the second oil pipe 8. Both the first oil pipe 5 and the second oil pipe 8 are hoses. The oil pump 3 is a plunger pump. The oil inlet of the oil pump 3 is connected to the oil outlet of the lubricating oil tank 1. One end of the first oil pipe 5 is connected to the oil outlet of the oil pump 3, and the other end of the first oil pipe 5 is connected to one end of the second oil pipe 8 via the hose connector 9. The other end of the second oil pipe 8 is connected to the oil nozzle 6, which is connected to the engine exhaust manifold. The oil pump 3 can be controlled by the ECU, ensuring a stable lubricating oil supply and allowing for timely adjustment of the lubricating oil supply as the engine load changes.

[0024] The oil inlet pipe 4 is a flexible hose. Under normal conditions, the oil pump 3 draws lubricating oil from the oil tank 1 through the oil inlet pipe 4 and then delivers the lubricating oil to the oil inlet of the engine exhaust manifold through the oil supply line. The lubricating oil enters the oil inlet and drips onto the high-speed rotating crankshaft through the reed valve by its own weight. The high-speed rotating crankshaft then throws the lubricating oil onto the parts that need lubrication, such as pistons, cylinders, cylinder walls, valve pushrods, etc., thereby achieving the function of lubrication.

[0025] like Figure 1As shown, the oil tank pad 2 has a hollow internal structure. The oil pump 3 is fixedly installed inside the inner cavity of the oil tank pad 2, and the lubricating oil tank 1 is located outside the oil tank pad 2. The oil tank pad 2 includes a first connecting part, a second connecting part, and a third connecting part. The lubricating oil tank 1 is fixedly connected to the first connecting part, the first connecting part is fixedly connected to the second and third connecting parts, the second connecting part is fixedly connected to the third connecting part, and the oil pump 3 is fixedly connected to the second connecting part. One end of the second connecting part along its length is fixedly connected to one end of the first connecting part along its length, and the other end of the second connecting part along its length is fixedly connected to one end of the third connecting part along its length. There is an acute angle between the length directions of the first and second connecting parts. The oil pump 3 is fixedly connected to the second connecting part by bolts and is located between the first and second connecting parts. Bolts can be used to fix the plunger pump to the inside of the oil tank pad 2, ensuring the compactness and stability of the entire separate lubrication system structure without affecting its function.

[0026] like Figure 1 As shown, the oil tank pad 2 provides support for the oil tank 1, which is in an inclined state, with the oil tank pad 2 located below it. The oil tank 1 is fixed to the first connecting part by cable ties, and the first connecting part is in contact with the outer wall of the oil tank 1. The oil tank 1 has a unique vent pipe 7, which is a flexible hose, to ensure the stability of the pressure inside the oil tank 1.

[0027] like Figure 1 and Figure 4 As shown, in this invention, the first oil pipe 5 and the second oil pipe 8 are connected by a hose connector 9, and are locked with a single-ear stepless clamp to ensure reliable sealing. To ensure reliable sealing between the second oil pipe 8 and the oil nozzle 6, clamps are also used to lock the connection. Clamps are added to the connections between the oil inlet pipe 4 and the first oil pipe 5, and between the first oil pipe 5 and the lubricating oil tank 1 to ensure reliable and airtight connections.

[0028] The lubrication system for small, naturally aspirated aircraft piston engines with the above-described structure has the following advantages:

[0029] 1. Multifunctional integration, no external oil or water lines, compact engine layout, and high reliability;

[0030] 2. It has an independent lubricating oil tank 1 and a matching oil tank pad 2, which ensures the internal pressure of the lubricating oil tank 1 while improving its structural stability and compactness.

[0031] 3. The matching individual oil pipe uses a high-performance oil delivery hose, which avoids contact with fuel, reduces the weight of the separate lubrication system, and greatly improves its versatility, enabling it to adapt to various complex structures.

[0032] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A lubrication system for a small naturally aspirated aircraft piston engine, comprising an oil tank and an oil pump, characterized in that: It also includes a tank pad, an oil supply line connected to the oil pump, an air outlet pipe connected to the lubricating oil tank, and an oil inlet pipe connected to the lubricating oil tank and the oil pump, with the lubricating oil tank and the oil pump mounted on the tank pad. The oil supply pipeline includes a first oil pipe connected to the oil pump, a second oil pipe connected to the first oil pipe through a hose connector, and an oil nozzle connected to the second oil pipe. Both the first oil pipe and the second oil pipe are hoses. The oil pump inlet is connected to the oil outlet of the lubricating oil tank. One end of the first oil pipe is connected to the oil pump outlet. The other end of the first oil pipe is connected to one end of the second oil pipe through a hose connector. The other end of the second oil pipe is connected to the oil nozzle, which is connected to the engine exhaust manifold. The oil inlet pipe is a flexible hose. Under normal conditions, the oil pump draws lubricating oil from the oil tank through the oil inlet pipe and then delivers the lubricating oil to the oil inlet of the engine exhaust manifold through the oil supply line. The oil tank gasket has a hollow internal structure. The oil pump is fixedly installed in the inner cavity of the oil tank gasket, and the lubricating oil tank is located outside the oil tank gasket. The oil tank gasket includes a first connecting part, a second connecting part, and a third connecting part. The lubricating oil tank is fixedly connected to the first connecting part. The first connecting part is fixedly connected to the second and third connecting parts. The second connecting part is fixedly connected to the third connecting part. The oil pump is fixedly connected to the second connecting part. One end of the second connecting part along its length is fixedly connected to one end of the first connecting part along its length. The other end of the second connecting part along its length is fixedly connected to one end of the third connecting part along its length. The other end of the first connecting part along its length is fixedly connected to the other end of the third connecting part along its length. There is an angle between the length directions of the first and second connecting parts, and this angle is acute. There is an angle between the length directions of the second and third connecting parts, and this angle is acute. The oil pump is fixedly connected to the second connecting part by bolts, and the oil pump is located between the first connecting part and the second connecting part; The oil tank pad provides support for the lubricating oil tank, which is in an inclined state. The oil tank pad is located below the lubricating oil tank, and the first connecting part is in contact with the outer wall surface of the lubricating oil tank.

2. The lubrication system for a small naturally aspirated aircraft piston engine according to claim 1, characterized in that: The oil pump is a plunger pump.

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