Piston assembly for an engine
OwnerNing Tao, Shaoping Wanginventors
Life of this patent
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Abstract
In an engine piston assembly of the present invention, a piston structure, together with a piston ring set matched to the piston structure and an inner wall of a cylinder bore body, forms a crevice passage having at least two annular expansion chambers and also having a function of multistage throttling and expansion. The engine piston assembly of the present invention can not only greatly and effectively reduce the intra-cylinder carbon deposition and the hydrocarbon emissions in the exhaust gas emissions of the engine, but also significantly improve the engine efficiency and the overall performance of the engine, so that the present invention is suitable for wide applications.
Claims21
1-10. (canceled)
A piston assembly for an engine, comprising:
- a cylinder bore body with an inner wall;
- a piston body;
- a first compression piston ring;
- a second compression piston ring;
- and
- an oil ring assembly;
- wherein,
- the first compression piston ring, the second compression piston ring and the oil ring assembly each contacts with the inner wall of the cylinder bore body;
- a top land, a first compression ring groove, a second land, a second compression ring groove, a third land, and an oil ring groove are disposed in turn on the periphery of the piston body from top to bottom;
- more than one annular expansion chamber is disposed between the second land and the inner wall of the cylinder bore body, and the more than one annular expansion chamber is defined by the region between more than one annular expansion groove disposed on the periphery of the second land and the inner wall of the cylinder bore body;
- so that a crevice passage with a multistage throttling and expansion is formed, which has a function of multistage throttling and expansion.
A piston assembly for an engine, the engine comprising:
- a cylinder bore body with an inner wall;
- a piston body;
- a first compression piston ring;
- a second compression piston ring;
- and
- an oil ring assembly;
- wherein,
- the first compression piston ring, the second compression piston ring and the oil ring assembly each contacts with the inner wall of the cylinder bore body;
- a top land, a first compression ring groove, a second land, a second compression ring groove, a third land, and an oil ring groove are disposed in turn on the periphery of the piston body from top to bottom;
- at least one annular expansion chamber is disposed between the second land and the inner wall of the cylinder bore body, the at least one annular expansion chamber is defined by the region between at least one annular expansion groove disposed on the periphery of the second land and the inner wall of the cylinder bore body, and at least one annular expansion chamber is also disposed between the third land and the inner wall of the cylinder bore body, and the at least one annular expansion chamber is defined by the region between the at least one annular expansion groove disposed on the periphery of the third land and the inner wall of the cylinder bore body;
- so that a crevice passage with a multistage throttling and expansion is formed, which has a function of multistage throttling and expansion.
A piston assembly for an engine, the engine comprising:
- a cylinder bore body with an inner wall;
- a piston body;
- a first compression piston ring;
- a second compression piston ring;
- and
- an oil ring assembly;
- wherein,
- the first compression piston ring, the second compression piston ring and the oil ring assembly each contacts with the inner wall of the cylinder bore body;
- a top land, a first compression ring groove, a second land, a second compression ring groove, a third land, and an oil ring groove are disposed in turn on the periphery of the piston body from top to bottom;
- at least one annular expansion chamber is disposed between the third land and the inner wall of the cylinder bore body, and the at least one annular expansion chamber is defined by the region between the at least one annular expansion groove disposed on the periphery of the third land and the inner wall of the cylinder bore body;
- so that a crevice passage with a multistage throttling and expansion is formed, which has a function of multistage throttling and expansion.
Dependencies are inferred from the claim text.