Piston having combustion chamber defined in the crown
AssigneeInternational Engine Intellectual Property Company, LLC
InventorZhengbai Liu
Life of this patent
Estimating the term…
Abstract
A combustion chamber assembly (and a piston having the combustion chamber assembly) for use in a diesel engine, includes a combustion chamber being defined in a crown of a piston, the combustion chamber having a central axis, and having a center portion being raised above a bottom plane of the combustion chamber. The center portion of the combustion chamber is defined in part by a portion of a sphere, the sphere having a radius, the origin of the radius lying on the combustion chamber central axis. The combustion chamber has a plurality of curved surfaces having smooth tangential transitions between adjacent smooth surfaces, the smooth surfaces including the spherical center portion in combination with a plurality of annular surfaces. A method of forming a combustion chamber is also included.
Claims32
A combustion chamber assembly for use in a diesel engine, comprising:
- a combustion chamber being defined in a crown of a piston, the combustion chamber having a central axis, and a center portion being elevated relative to a bottom plane of the combustion chamber;
- the center portion being defined in part by a portion of a sphere, the sphere having a radius, the origin of the radius lying on the combustion chamber central axis;
- and
- the combustion chamber having a plurality of curved surfaces having smooth tangential transitions between adjacent smooth surfaces, the smooth surfaces including the spherical center portion in combination with a plurality of annular surfaces.
A piston for use in a diesel engine, comprising:
- a combustion chamber being defined in a crown of the piston, the piston having a central axis, the combustion chamber having a center portion being elevated relative to a bottom plane of the combustion chamber, the center portion being defined in part by a portion of a sphere, the sphere having a radius, the origin of the radius lying on the combustion chamber central axis, the combustion chamber having a plurality of curved surfaces having smooth tangential transitions between adjacent smooth surfaces, the smooth surfaces including the spherical center portion in combination with a plurality of annular surfaces.
A combustion chamber assembly for use in a diesel engine, comprising:
- a combustion chamber being defined in a crown of a piston, the combustion chamber having a central axis, and having a center portion being elevated relative to a bottom plane of the combustion chamber;
- the center portion being defined in part by a portion of a sphere, the sphere having a radius, the origin of the spherical surface lies coincident with a point of intersection of the bottom plane with the combustion chamber central axis;
- the combustion chamber having a plurality of curved surfaces having smooth tangential transitions between adjacent smooth surfaces, the smooth surfaces including the spherical center portion in combination with a plurality of annular surfaces;
- and
- at least a portion of the plurality of annular surfaces defining a reentrant interface with the crown of the piston.
A method of farming a combustion chamber for use in a diesel engine, comprising:
- defining a combustion chamber in a crown of a piston, the combustion chamber having a central axis;
- defining a combustion chamber center portion being raised above a bottom plane of the combustion chamber;
- defining the center portion in part by a portion of a sphere, the sphere having a radius,
- locating the origin of the radius lying on the combustion chamber central axis;
- and
- defining a plurality of combustion chamber curved surfaces having smooth tangential transitions between adjacent smooth surfaces, the smooth surfaces including the spherical center portion in combination with the plurality of annular surfaces.
Dependencies are inferred from the claim text.