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A top structure of piston for direct injection gasoline engine in cylinder

An in-cylinder direct injection, gasoline engine technology, applied to pistons, mechanical equipment, engine components, etc., can solve problems such as tumble ratio, low peak combustion pressure, inability to effectively increase combustion temperature, and affect catalytic ignition effect, etc. Combustion compression ratio, reducing the need for fuel enrichment protection, improving thermal efficiency and fuel economy

Active Publication Date: 2017-05-03
HEFEI CHANGAN AUTOMOBILE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pits on the top of the pistons of direct injection engines are generally designed to be circular or elliptical. This structure cannot effectively increase the combustion temperature and affect the catalytic ignition effect. Inefficient

Method used

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  • A top structure of piston for direct injection gasoline engine in cylinder
  • A top structure of piston for direct injection gasoline engine in cylinder
  • A top structure of piston for direct injection gasoline engine in cylinder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 , figure 2 , image 3 , Figure 4 The top structure of the piston of the direct injection gasoline engine shown in the cylinder includes a horseshoe-shaped protrusion 2 on the top of the piston, its opening part faces the left side of the piston (intake side), and a roughly Pot-shaped pit 1.

[0027] The pit is closer to the left side of the piston than the center of the top of the piston. The bottom surface 101 of the pit is a plane inclined downward from left to right. The pit is symmetrical front and back along the center line of the left and right directions of the piston. In this embodiment, the included angle C2 between the central axis of the piston and the axis perpendicular to the bottom surface of the pit is 5.5°.

[0028] The bottom surface profile of the pit is composed of two circular arc segments and a straight line segment tangent to the two circular arc segments. side, and the radius of the arc segment closer to the raised opening ...

Embodiment 2

[0041] Such as figure 1 , figure 2 , image 3 , Figure 4 The top structure of the piston of the direct injection gasoline engine shown in the cylinder includes a horseshoe-shaped protrusion 2 arranged on the top of the piston, the opening part of which faces to the left side of the piston (intake side), and an approximate circle is formed inside the protrusion. Pot-shaped pit 1.

[0042]The pit is closer to the left side of the piston than the center of the top of the piston. The bottom surface 101 of the pit is a plane inclined downward from left to right. The pit is symmetrical front and back along the center line of the left and right directions of the piston. In this embodiment, the included angle C2 between the central axis of the piston and the axis perpendicular to the bottom surface of the pit is 3°.

[0043] The bottom surface profile of the pit is composed of two circular arc segments and a straight line segment tangent to the two circular arc segments. side, ...

Embodiment 3

[0052] Such as figure 1 , figure 2 , image 3 , Figure 4 The top structure of the piston of the direct injection gasoline engine shown in the cylinder includes a horseshoe-shaped protrusion 2 on the top of the piston, its opening part faces the left side of the piston (intake side), and a roughly Pot-shaped pit 1.

[0053] The pit is closer to the left side of the piston than the center of the top of the piston. The bottom surface 101 of the pit is a plane inclined downward from left to right. The pit is symmetrical front and back along the center line of the left and right directions of the piston. In this embodiment, the included angle C2 between the central axis of the piston and the axis perpendicular to the bottom surface of the pit is 8°.

[0054] The bottom surface profile of the pit is composed of two circular arc segments and a straight line segment tangent to the two circular arc segments. side, and the radius of the arc segment closer to the raised opening is...

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Abstract

The invention discloses a top structure of a direct-injection gasoline engine piston. The top structure of the direct-injection gasoline engine piston comprises a horseshoe-shaped protrusion arranged on the top of the piston. An approximately basin-shaped pit is enclosed in the protrusion and is closer to the left of the piston relative to the top center of the piston. The bottom surface of the pit is a flat surface inclined downwards from left to right. The right of the protrusion is provided with an exhaust opening inclined downwards for avoiding the inclined surface. The top structure of the direct-injection gasoline engine piston can increase the compression ratio of engine combustion and improve the engine thermal efficiency and the fuel economy.

Description

technical field [0001] The invention relates to a gasoline engine piston, in particular to a top structure of an in-cylinder direct injection gasoline engine piston. Background technique [0002] In-cylinder direct injection technology is a hot technology developed by domestic and foreign gasoline engines in recent years. It has good working stability and load performance, and can realize stratified combustion. Reduced fuel consumption while increasing engine power and torque. For the application of in-cylinder direct injection technology, it is necessary to design a suitable shape of the combustion chamber to cooperate with the realization of functions such as catalytic light-off, stratified combustion, and formation of in-cylinder tumble flow in the in-cylinder direct injection engine. [0003] The combustion chamber of the engine is mainly composed of the cylinder head combustion chamber and the piston top structure. At present, the top of the piston of a general direct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02F3/00
CPCF02F3/00
Inventor 林翰胡铁刚徐勇尹强李久林
Owner HEFEI CHANGAN AUTOMOBILE