Engine piston cooling system and engine

Abstract

The utility model discloses an engine piston cooling system and an engine, the engine piston cooling system comprises a piston cooling nozzle and a main oil way arranged in a crankcase, the piston cooling nozzle is communicated with the main oil way and is provided with a spraying port, and the spraying port is used for spraying engine oil in the main oil way to a piston so as to cool and lubricate the piston; according to the engine piston cooling system and the engine, high-pressure engine oil can be directly sprayed to the piston and the inner cavity wall of the piston, a crank-link mechanism is matched to rotate to drive the engine oil to splash so as to cool and lubricate the piston, meanwhile, oil pressure of an oil way directly spraying the piston is more stable, the piston is cooled more sufficiently, and the service life of the engine is prolonged. Meanwhile, the connecting rod bearing bush is lubricated more sufficiently, and the service life is longer.

Description

Technical Field

[0001] The utility model relates to the technical field of engine pistons, in particular to an engine piston cooling system and an engine. Background Art

[0002] The motorcycle engine is the heart of the motorcycle and is used to drive the motorcycle. The motorcycle engine consists of a cylinder block, a piston built into the cylinder block, a crankshaft and connecting rod assembly, and a crankcase. The piston converts the energy of fuel combustion into rotational motion of the crankshaft and connecting rod, which is then transferred to the external wheels through a connecting mechanism, driving the wheels to rotate. Due to the reciprocating motion of the piston, the friction between it and the cylinder and the heat generated by the combustion in the engine's combustion chamber cause the piston to be loaded with heavy loads and high temperatures. If the piston is not properly cooled and lubricated, the piston will be damaged.

[0003] , which can easily lead to piston deformation and even cylinder scuffing, shortening the service life of the piston, increasing engine pollutant emissions and generating noise.

[0004] In the prior art, most engine components are lubricated by providing a main oil channel connected to an oil pump within the casing. Under pressure, the oil pumped from the oil pump is delivered to various components through the main oil channel and branch oil channels connected to it, achieving cooling and lubrication. Piston cooling and lubrication primarily relies on oil splashing onto the pistons from the rotation of the crankshaft-connecting rod mechanism. However, due to its inherent characteristics, splash lubrication makes it difficult to reach certain areas, such as the piston's inner wall and when the piston reaches top dead center. Oil spray holes are provided at certain angles in the connecting rod's big end, allowing lubricating oil to spray onto the piston's inner wall to achieve cooling and lubrication. However, by the time the oil cooling and lubricating the piston passes through the oil spray holes in the connecting rod's big end, it is already at the end of the oil channel, resulting in insufficient oil pressure. Furthermore, after drilling the connecting rod's big end, localized surface pressure is uneven, and burrs are easily generated, which reduces the strength of the connecting rod's big end, exacerbates wear, and shortens the connecting rod's service life.

[0005] Therefore, there is an urgent need to develop an engine piston lubrication system that can spray high-pressure oil directly onto the inner wall of the piston, and cooperate with the rotation of the crank-connecting rod mechanism to drive the oil splash to cool and lubricate the piston. At the same time, the oil pressure of the oil circuit directly spraying the piston is more stable, the piston cooling is more sufficient, and the connecting rod bearing is more fully lubricated and has a longer service life. Utility Model Content

[0006] In view of this, the purpose of the present invention is to provide an engine piston cooling system and an engine, which can spray high-pressure engine oil directly onto the inner wall of the piston, and cooperate with the rotation of the crank-connecting rod mechanism to drive the engine oil to splash to cool and lubricate the piston. At the same time, the oil pressure of the oil circuit directly spraying the piston is more stable, the piston cooling is more sufficient, and the lubrication of the connecting rod bearing is also more sufficient, and the service life is longer.

[0007] The engine piston cooling system of the utility model comprises a piston cooling nozzle and a main oil circuit arranged in the crankcase. The piston cooling nozzle is connected to the main oil circuit and is provided with a spray port. The spray port faces the piston and is used to spray the engine oil in the main oil circuit into the piston cavity to cool and lubricate the piston.

[0008] Furthermore, the main oil circuit includes a bearing oil circuit, which is connected to the main oil circuit and is used to transport the engine oil in the main oil circuit to the bearing of the crankshaft.

[0009] Furthermore, a branch oil circuit I can be formed in the bearing oil circuit, and the branch oil circuit I extends to one side of the cylinder to the cylinder body joint surface and is blocked by a plug. A spray oil circuit connected to the piston cooling nozzle is provided on the branch oil circuit I.

[0010] Furthermore, a branch oil circuit including oil circuit I and oil circuit II can be formed on the bearing oil circuit, one end of the oil circuit I is connected to the bearing oil circuit, and the other end extends to the cylinder side to the cylinder body joint surface, and the crankcase is provided with an oil groove connecting the oil circuit I and the oil circuit II on the cylinder body joint surface, and the oil circuit II is provided with a spray oil circuit connected to the piston cooling nozzle.

[0011] Furthermore, the bearing oil circuit and the branch oil circuit I are located on the same plane, and the bearing oil circuit and the branch oil circuit are connected at a certain angle.

[0012] Furthermore, the bearing oil circuit, oil circuit I and oil circuit II are located on the same plane, oil circuit I and the bearing oil circuit are connected at a certain angle, and oil circuit I and oil circuit II are parallel to each other.

[0013] Furthermore, the piston cooling nozzle is L-shaped and is provided with a limiting assembly. After the piston cooling nozzle is connected to the main oil circuit, it is fixed by the limiting assembly.

[0014] Furthermore, the piston cooling nozzle is connected to the main oil circuit through a spray oil circuit, the spray port of the piston cooling nozzle forms an angle with the joint surface of the crankcase and is fixed by the limit assembly, and the spray port of the piston cooling nozzle faces the piston.

[0015] Furthermore, the piston is arranged in the cylinder, and the cylinder body is provided with a clearance opening at a position corresponding to the spray port of the piston cooling nozzle, and the clearance opening is used to extend the piston cooling nozzle into the cylinder.

[0016] The utility model also provides an engine, on which the engine piston cooling system as described above is installed.

[0017] The beneficial effects of the present invention are as follows: the engine piston cooling system and the engine of the present invention can spray high-pressure engine oil directly onto the inner cavity wall of the piston, and cooperate with the rotation of the crank-connecting rod mechanism to drive the engine oil to splash to cool and lubricate the piston. At the same time, the oil pressure of the oil circuit directly spraying the piston is more stable, the piston is cooled more fully, and the connecting rod bearing is lubricated more fully, and the service life is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a schematic diagram of the structure of the utility model Figure I ;

[0020] Figure 2 This is a cross-sectional view of the left crankcase of the present utility model;

[0021] Figure 3 It is a cross-sectional view of the right crankcase of the present utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the utility model Figure II ;

[0023] Figure 5 This is a schematic diagram of the structure of the utility model Figure III ;

[0024] Figure 6 This is a cross-sectional view of the nozzle on the left crankcase of the present invention;

[0025] Figure 7 This is a cross-sectional view of the nozzle on the right crankcase of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the utility model Figure IV ;

[0027] Figure 9 This is a schematic diagram of the structure of the utility model Figure V

[0028] Numbers in the figure: 1. Piston cooling nozzle; 2. Bearing oil circuit; 3. Bearing; 4. Branch oil circuit I; 5. Plug; 6. Spray oil circuit; 7. Oil circuit I; 8. Oil circuit II; 9. Oil tank; 10. Spray port; 11. Piston; 12. Makeway port; 13. Cylinder; 14. Bolt; 15. Gasket; 16. Crankcase; 17. Main oil circuit 17. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0031] As shown in the figure: the engine piston cooling system of this embodiment includes a piston cooling nozzle 1 and a main oil circuit 17 arranged in a crankcase 16. The piston cooling nozzle 1 is connected to the main oil circuit 17 and is provided with a spray port 10. The spray port 10 is directly facing the piston 11 and is used to spray the oil in the main oil circuit 17 into the inner cavity of the piston 11 to cool and lubricate the piston 11. After the oil pump sends the oil into the main oil circuit 17, the piston cooling nozzle 1 is connected to the main oil circuit 17 so that the oil enters the piston cooling nozzle 1, thereby discharging the oil from the spray port of the piston cooling nozzle 1. The spray nozzle 10 sprays out and cools and lubricates the piston 11. The cooling and lubrication of the piston 11 is an important component of the engine lubrication system. Its main function is to reduce internal friction and wear of the engine, and play the role of heat dissipation, lubrication, cleaning, sealing, rust prevention, and shock absorption and buffering. The main components of the lubrication system include the oil pump, oil filter, oil cooler, etc. The oil pump is responsible for providing pressure to make the oil circulate in the lubrication system; the oil filter is used to filter out impurities in the lubricating oil; the oil cooler is used to control the oil temperature and keep it within the appropriate temperature range.

[0032] In this embodiment, the main oil circuit 17 includes a bearing oil circuit 2, which is connected to the main oil circuit 17 and is used to transport the oil in the main oil circuit 17 to the bearing 3 of the crankshaft; Figure 2 and Figure 3As shown, the bearing oil circuit 2 refers to the oil circuit connected to the main oil circuit 17 and the crankshaft bearing. The bearing is part of the bearing in the crankshaft. It supports the rotating shaft and reduces friction and wear. The design of the bearing oil circuit 2 is crucial to ensuring the long-term stable operation of the bearing; the bearing oil circuit 2 transports the engine oil in the main oil circuit 17 to the bearing, so that the oil is evenly distributed on the bearing to achieve lubrication effect, reduce friction between the shaft and the bearing, reduce wear, and improve mechanical efficiency. Under high load or high-speed rotation, the bearing may generate a lot of heat, and the circulating oil can take away the heat to prevent overheating; in this solution, the bearing oil circuit 2 and the main oil circuit 17 are vertically connected. The vertical connection design can ensure that the engine oil flows directly and quickly from the main oil channel to the bearing oil circuit 2, thereby more effectively lubricating the engine components and improving efficiency. The simplified oil circuit design with vertical connection also makes subsequent maintenance and inspection work more convenient. The path of the bearing oil circuit 2 and the main oil circuit 17 is more direct, and inspection and cleaning are easier.

[0033] In this embodiment, Figure 2 As shown, a branch oil circuit Ⅰ4 can be formed on the bearing oil circuit 2, and the branch oil circuit Ⅰ4 extends to the side of the cylinder 13 to the cylinder body joint surface and is blocked by a plug 5. A spray oil circuit 6 connected to the piston cooling nozzle 1 is provided on the branch oil circuit Ⅰ4; the plug 5 can be used to effectively block the branch oil circuit Ⅰ4 to prevent oil leakage, ensure the sealing of the oil circuit system, and avoid pollution and waste caused by leakage. The plug 5 can also achieve rapid blocking and unblocking, which is convenient for maintenance and inspection of the oil circuit system, especially when the oil circuit needs to be cleaned or parts need to be replaced.

[0034] In this embodiment, Figure 3 As shown, a branch oil circuit including oil circuit I7 and oil circuit II8 can also be formed on the bearing oil circuit 2. One end of the oil circuit I7 is connected to the bearing oil circuit 2, and the other end extends to the cylinder 13 side to the cylinder joint surface. The crankcase 16 is provided with an oil groove 9 connecting the oil circuit I7 and the oil circuit II8 on the cylinder joint surface, and the oil circuit II8 is provided with a spray oil circuit 6 connected to the piston cooling nozzle 1.

[0035] In this embodiment, the bearing oil circuit 2 can adopt the two oil circuit layouts described above. When the internal space of the crankcase 16 corresponding to the bearing oil circuit 2 is sufficient, the bearing oil circuit 2 can be connected to the piston cooling nozzle 1 using the layout of the branch oil circuit Ⅰ4. When the internal space of the crankcase 16 corresponding to the bearing oil circuit 2 is insufficient and processing and production are difficult, the bearing oil circuit 2 can be connected to the piston cooling nozzle 1 using the layout of the oil circuit Ⅰ7 and the oil circuit Ⅱ8. The engine lubrication system of this scheme, single-cylinder, two-cylinder or multi-cylinder engines can select the corresponding oil circuit layout according to the conditions of the internal space of each crankcase 16, which can greatly increase the versatility and practicality of the engine lubrication system.

[0036] In this embodiment, the bearing oil circuit 2 and the branch oil circuit Ⅰ4 are located on the same plane, and the bearing oil circuit 2 and the branch oil circuit are connected at a certain angle; the bearing oil circuit 2 and the branch oil circuit Ⅰ4 are connected at a certain angle, which can reduce turbulence and pressure loss in the flow of engine oil, thereby improving the efficiency of the oil circuit and the fluidity of the engine oil, and can also help to guide the engine oil more smoothly from the bearing oil circuit 2 to the branch oil circuit Ⅰ4. At the same time, in the space-constrained engine interior, the bearing oil circuit 2 and the branch oil circuit Ⅰ4 are connected at a certain angle, which can make the layout of the oil circuit more flexible and facilitate installation and maintenance.

[0037] In this embodiment, the bearing oil circuit 2, oil circuit I7 and oil circuit II8 are located on the same plane, the oil circuit I7 and the bearing oil circuit 2 are connected at a certain angle, and the oil circuit I7 and the oil circuit II8 are parallel to each other; the bearing oil circuit 2 and the oil circuit I7 are connected at a certain angle, which can reduce the turbulence and pressure loss in the flow of the engine oil, thereby improving the efficiency of the oil circuit and the fluidity of the engine oil, and can also help to guide the engine oil from the bearing oil circuit 2 to the oil circuit I7 more smoothly. At the same time, in the space-constrained engine interior, the bearing oil circuit 2 and the oil circuit I7 are connected at a certain angle, which can make the layout of the oil circuit more flexible and facilitate installation and maintenance; the mutually parallel oil circuit I7 and oil circuit II8 can not only ensure the reasonable layout of the internal space of the crankcase 16, but the mutually parallel layout also helps the processing of the oil circuit I7 and the oil circuit II8, making production more convenient.

[0038] In this embodiment, the piston cooling nozzle 1 is L-shaped, and a limiting assembly is further provided on the piston cooling nozzle 1. After the piston cooling nozzle 1 is connected to the main oil circuit 17, it is limited by the limiting assembly; the spray port 10 of the piston cooling nozzle 1 forms an angle with the joint surface of the crankcase 16 and is fixed by the limiting assembly, and the spray port 10 of the piston cooling nozzle 1 faces the piston 11; the function of the limiting assembly is to limit the piston cooling nozzle 1, and the joint surface of the crankcase 16 refers to the joint plane between two adjacent crankcases 16, which is fixed by the limiting assembly. By forming an angle with the joint surface of the crankcase 16, it is ensured that the engine oil sprayed from the spray port 10 of the piston cooling nozzle 1 can be sprayed on the inner cavity wall of the piston 11, so that the cooling and lubrication of the piston are more sufficient; in this solution, the limiting component includes a bolt 14 and a gasket 15, and a bolt hole adapted to the bolt 14 is opened near the piston cooling nozzle 1. The piston cooling nozzle 1 is limited by the bolt 14 and the gasket 15. The limiting component can also use other mechanical connection methods to limit the piston cooling nozzle 1, which will not be repeated here.

[0039] In this embodiment, the piston 11 is arranged in the cylinder 13, and the cylinder 13 body is provided with a makeshift opening 12 at a position corresponding to the spray port 10 of the piston cooling nozzle 1, and the makeshift opening 12 is used to extend the piston cooling nozzle 1 into the cylinder 13; when the engine is compactly assembled, the design of the makeshift opening 12 enables the spray port 10 of the piston cooling nozzle 1 to extend into the cylinder 13 in a limited space, and cooperates with the limit assembly to ensure that the oil sprayed by the piston cooling nozzle 1 acts on the piston 11, thereby achieving the effect of cooling and lubrication.

[0040] The present invention also provides an engine, which is equipped with the engine piston cooling system as described above; it is capable of spraying high-pressure engine oil directly onto the inner wall of the piston 11, and driving the engine oil to splash in conjunction with the rotation of the crank-connecting rod mechanism to cool and lubricate the piston 11. At the same time, the oil pressure of the oil circuit directly spraying the piston 11 is more stable, the piston 11 is cooled more fully, and the connecting rod bearing is also more fully lubricated, thereby extending the service life.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An engine piston cooling system, characterized in that: It includes a piston cooling nozzle and a main oil circuit arranged in the crankcase. The piston cooling nozzle is connected to the main oil circuit and is provided with a spray port. The spray port is used to spray the engine oil in the main oil circuit into the piston cavity to cool and lubricate the piston.

2. The engine piston cooling system according to claim 1, characterized in that: The main oil circuit includes a bearing oil circuit, which is connected to the main oil circuit and is used to transport the engine oil in the main oil circuit to the bearing of the crankshaft.

3. The engine piston cooling system according to claim 2, characterized in that: A branch oil circuit I can be formed on the bearing oil circuit. The branch oil circuit I extends toward one side of the cylinder to the cylinder body joint surface and is blocked by a plug. A spray oil circuit connected to the piston cooling nozzle is provided on the branch oil circuit I.

4. The engine piston cooling system according to claim 2, characterized in that: The bearing oil circuit can also form a branch oil circuit including oil circuit I and oil circuit II, one end of the oil circuit I is connected to the bearing oil circuit, and the other end extends to the cylinder side to the cylinder joint surface, and the crankcase is provided with an oil groove connecting the oil circuit I and oil circuit II on the cylinder joint surface, and the oil circuit II is provided with a spray oil circuit connected to the piston cooling nozzle.

5. The engine piston cooling system according to claim 3, characterized in that: The bearing oil circuit and the branch oil circuit I are located on the same plane, and are connected to each other at a certain angle.

6. The engine piston cooling system according to claim 4, characterized in that: The bearing oil circuit, oil circuit I and oil circuit II are located on the same plane, oil circuit I and the bearing oil circuit are connected at a certain angle, and oil circuit I and oil circuit II are parallel to each other.

7. The engine piston cooling system according to claim 1, characterized in that: The piston cooling nozzle is L-shaped and is further provided with a limiting assembly. The piston cooling nozzle is fixed by the limiting assembly after being connected to the main oil circuit.

8. The engine piston cooling system according to claim 7, characterized in that: The spray port of the piston cooling nozzle forms an angle with the joint surface of the crankcase and is fixed by the limiting assembly, and the spray port of the piston cooling nozzle faces the piston.

9. The engine piston cooling system according to claim 1, characterized in that: The piston is arranged in the cylinder, and the cylinder body is provided with a clearance opening at a position corresponding to the spraying port of the piston cooling nozzle, and the clearance opening is used to extend the piston cooling nozzle into the cylinder.

10. An engine, characterized in that: The engine is equipped with an engine piston cooling system as described in any one of claims 1 to 9.

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