Diesel piston with semi-hemispherical crown
AssigneeCummins Inc.
InventorsJason W. Mackey, David M. Barnes
Life of this patent
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Abstract
A diesel engine includes a cylinder block having a cylinder cavity defined therein. A cylinder head is coupled to the cylinder block and includes a lower semi-hemispherical surface defined thereon that defines an upper boundary of a combustion chamber. The engine includes a piston slideably disposed within the cylinder cavity that includes a piston crown having an upper surface configured to define a first portion of a lower boundary of the combustion chamber. The upper surface of the piston crown includes an axi-symmetric semi-hemispherical shape configured to correspond to the lower semi-hemispherical surface of the cylinder head.
Claims20
A piston for a diesel engine, the piston comprising:
- a piston crown including a piston bowl and an upper surface that define a portion of a lower boundary of a combustion chamber, wherein the upper surface comprises an axi-symmetric semi-hemispherical shape and an outer periphery portion extending from an outer position of the axi-symmetric semi-hemispherical shape to a peripheral edge of the piston crown, wherein the outer periphery portion is oriented substantially perpendicular to a central axis of the piston.
A diesel engine comprising:
- a cylinder block including a cylinder cavity defined therein, the cylinder cavity extending downward from an opening defined in an upper surface of the cylinder block;
- a cylinder head coupled to the cylinder block, wherein the cylinder head comprises a lower semi-hemispherical surface defined thereon, wherein the lower semi-hemispherical surface defines an upper boundary of a combustion chamber;
- and
- a piston slideably disposed within the cylinder cavity, the piston comprising a piston crown that includes:
- an upper surface that defines a portion of a lower boundary of the combustion chamber, wherein the upper surface comprises an axi-symmetric semi-hemispherical shape and an outer periphery portion extending from an outer position of the axi-symmetric semi-hemispherical shape to a peripheral edge of the piston crown wherein the outer periphery portion is oriented substantially perpendicular to a central axis of the piston.
A diesel engine comprising:
- a cylinder block including a cylinder cavity defined therein, the cylinder cavity extending downward from an opening defined in an upper surface of the cylinder block;
- a cylinder head coupled to the cylinder block, wherein the cylinder head comprises a lower semi-hemispherical surface defined thereon, wherein the lower semi-hemispherical surface defines an upper boundary of a combustion chamber;
- and
- a piston slideably disposed within the cylinder cavity, the piston comprising a piston crown that includes:
- an upper surface that defines a portion of a lower boundary of the combustion chamber, wherein the upper surface comprises an axi-symmetric semi-hemispherical shape that corresponds to the lower semi-hemispherical surface of the cylinder head and an outer periphery portion extending from an outer position of the axi-symmetric semi-hemispherical shape to a peripheral edge of the piston crown wherein the outer periphery portion is oriented substantially perpendicular to a central axis of the piston.
Dependencies are inferred from the claim text.