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Piston for internal combustion engine

A technology for internal combustion engines and pistons, applied to pistons, mechanical equipment, engine components, etc., can solve the problems of difficult formation of liquid lubricating oil film, uncoordinated bending and deformation, and low relative speed between piston pin and pin seat, so as to improve thermal efficiency and engine Economical, avoid deformation and strain, improve the effect of tumble ratio

Inactive Publication Date: 2016-11-09
力帆科技(集团)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The air pressure on the piston is transmitted to the connecting rod through the piston pin and the piston pin seat, but the total pressure bearing area of ​​the piston pin is limited, so the surface pressure between the piston pin and the pin seat is very high, and the piston pin and the pin seat The relative speed between them is very low, the liquid lubricating oil film is not easy to form, and it is easy to cause the strain of the pin hole. Explore and improve

Method used

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  • Piston for internal combustion engine
  • Piston for internal combustion engine
  • Piston for internal combustion engine

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Embodiment Construction

[0020] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0021] Such as figure 1 , figure 2 , image 3 , Figure 4 As shown, the internal combustion engine piston includes a piston top, a piston skirt 12, a piston pin seat 9 and a piston pin hole 11, and a graphite coating is provided on the outer wall of the piston skirt 12. There is a "U"-shaped boss 5 on the top of the piston, and the "U"-shaped boss 5 is 0.5mm-2.0mm higher than the upper surface of the cylinder block. The area surrounded by the "U"-shaped boss 5 forms a pit 3, the bottom surface of the pit 3 is a slope, and the inclination angle of the bottom surface of the pit 3 is 8°-10°. The depth of the pit 3 gradually increases from front to back, and the value is 2.5mm-7.0mm. The inner sidewall of the pit 3 is an oblique cone surface, and the bottom surface of the pit 3 and the inner sidewall are transitioned through rounded corners.

[0022] Such ...

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Abstract

The invention discloses a piston for an internal combustion engine. A U-shaped boss is arranged at the top of the piston; a concave pit is formed in an area defined by the U-shaped boss; two inlet valve avoiding pits are arranged in front of the opening end of the U-shaped boss; two exhaust valve avoiding pits are arranged on the rear side of the closed end of the U-shaped boss; and an annular groove is formed in the periphery of the U-shaped boss and communicates with the inlet valve avoiding pits and the exhaust valve avoiding pits. Through the structure, knocking can be effectively avoided while an ideal compression ratio can be reached; the tumbling ratio is increased without changing an air inlet system; the distance between a piston combustion chamber and a sparking plug is changed to lead more mixed gas to the position near the sparking plug, so that optimum mixed gas is realized at the sparking plug; the concave pits increase the clearance between the valves and the piston to reserve space for changing the valve stroke, so that the operating range of VVT is wider; and the piston can effectively improve thermal efficiency and the economical efficiency of an engine to avoid deformation and pulling of a piston pin hole.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engines, and in particular relates to a piston for internal combustion engines. Background technique [0002] The piston is one of the key components of the engine. Its main function is to withstand the gas pressure in the cylinder and transmit this pressure to the connecting rod through the piston pin to drive the crankshaft to rotate. The top of the piston, the cylinder head and the cylinder wall together form the combustion chamber, so the shape design of the piston has a direct relationship with the shape and compression ratio of the combustion chamber, which directly affects the formation and intensity of swirl, tumble and combustion in the combustion chamber. [0003] Most of the existing small-displacement gasoline engines use flat-top pistons, and the manufacturing process is simple, but there are disadvantages such as small heat absorption area, small compression ratio, and in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02F3/00F02F3/28F02F3/10F02F3/26
CPCF02F3/00F02F3/10F02F3/26F02F3/28
Inventor 蔡朋
Owner 力帆科技(集团)股份有限公司
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