Piston and injector for reduced head thermal loading
AssigneeDeere & Company
InventorsBryan T. Geisick, Won Geun Lee
Life of this patent
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Abstract
A piston and injector system designed to minimize thermal loading on the cylinder head of an internal combustion engine. The piston features a profiled upper surface that defines an annular piston bowl with a primary bowl configuration and an asymmetric bowl sector. The asymmetric bowl sector is configured to receive the fuel spray from the injector, directing combustion to reduce heat concentration on certain areas of the cylinder head. This design helps prevent overheating, thereby enhancing engine durability and performance.
Claims20
A piston for an engine having a cylinder head with a cylinder defining a combustion chamber and supporting a fuel injector configured to deliver a spray of fuel to the combustion chamber, the piston configured to reciprocate within the cylinder and compress a mixture of air and the fuel within the combustion chamber, the piston comprising:
- a piston head having a profiled upper surface that extends radially about a centerline and defines an annular piston bowl, the annular piston bowl having a primary bowl with a first bowl configuration and an asymmetric bowl sector with a second bowl configuration different from the first bowl configuration, the primary bowl extends about the centerline proximate a periphery of the piston head to each side of the asymmetric bowl sector and the asymmetric bowl sector extends farther from the centerline and a top plane of the piston head than the primary bowl, the primary bowl defined by a sweep of a radial line from the centerline of the piston head through a first angle and the asymmetric bowl sector defined by a sweep of the radial line from the centerline of the piston head through a second angle less than the first angle, the second angle sized so that the spray of fuel from the fuel injector is received within the asymmetric bowl sector and not the primary bowl.
A piston for an engine having a cylinder head with a cylinder defining a combustion chamber and supporting a fuel injector configured to deliver a spray of fuel to the combustion chamber, the piston configured to reciprocate within the cylinder and compress a mixture of air and the fuel within the combustion chamber, the piston comprising:
- a piston head having a profiled upper surface that extends radially about a centerline and defines an annular piston bowl, the annular piston bowl having a primary bowl with a first bowl configuration and an asymmetric bowl sector with a second bowl configuration different from the first bowl configuration, the primary bowl extends about the centerline proximate a periphery of the piston head to each side of the asymmetric bowl sector, the primary bowl defined by a sweep of a radial line from the centerline of the piston head through a first angle and the asymmetric bowl sector defined by a sweep of the radial line from the centerline of the piston head through a second angle less than the first angle, the second angle sized so that the spray of fuel from the fuel injector is received within the asymmetric bowl sector and not the primary bowl;
- wherein an upper surface of the piston head defines an annular shelf extending about the centerline between the primary bowl and the periphery of the piston head, the annular shelf including a primary shelf extending along the primary bowl and having a first shelf configuration and an asymmetric shelf sector extending along the asymmetric bowl sector having a second shelf configuration different from the first shelf configuration.
A piston for an engine having a cylinder head with a cylinder defining a combustion chamber and supporting a fuel injector configured to deliver a spray of fuel to the combustion chamber, the piston configured to reciprocate within the cylinder and compress a mixture of air and the fuel within the combustion chamber, the piston comprising:
- a piston head having a profiled upper surface that extends radially about a centerline and defines an annular piston bowl, the annular piston bowl having a primary bowl with a first bowl configuration and an asymmetric bowl sector with a second bowl configuration different from the first bowl configuration, the primary bowl extends about the centerline proximate a periphery of the piston head to each side of the asymmetric bowl sector, the primary bowl defined by a sweep of a radial line from the centerline of the piston head through a first angle and the asymmetric bowl sector defined by a sweep of the radial line from the centerline of the piston head through a second angle less than the first angle, the second angle sized so that the spray of fuel from the fuel injector is received within the asymmetric bowl sector and not the primary bowl;
- wherein the second bowl configuration of the asymmetric bowl sector has a greater concavity and extends farther from the centerline and a top plane of the piston head than the first bowl configuration of the primary bowl.
An engine having a cylinder head with a cylinder defining a combustion chamber and supporting a fuel injector configured to deliver of a spray of fuel to the combustion chamber, the engine having a piston disposed to reciprocate within the cylinder and compress a mixture of air and the fuel within the combustion chamber, the piston having a piston head with a profiled upper surface that extends radially about a centerline and defines an annular piston bowl, the annular piston bowl having a primary bowl with a first bowl configuration and an asymmetric bowl sector with a second bowl configuration different from the first bowl configuration, the primary bowl extends about the centerline proximate a periphery of the piston head to each side of the asymmetric bowl sector, the primary bowl defined by a sweep of a radial line from the centerline of the piston head through a first angle and the asymmetric bowl sector defined by a sweep of the radial line from the centerline of the piston head through a second angle less than the first angle, the second angle sized so that the spray of fuel from an injector is received within the asymmetric bowl sector and not the primary bowl.
Dependencies are inferred from the claim text.