Exhaust port
AssigneeDeere & Company
InventorAlbert L. Humke
Life of this patent
Estimating the term…
Abstract
An exhaust port has inlet and exhaust portions smoothly joined by a connecting portion which forms oppositely facing roof and floor walls. The roof is formed into flow-dividing projections upstream and downstream of a valve stem. These flow dividers divert flow around the valve stem, thus reducing flow separation and losses.
Claims9
In an internal combustion engine having a cylinder closed at one end, an exhaust port communicating with the cylinder through the closed end and a poppet exhaust valve disposed in the port and having head and stem portions reciprocal along an axis for controlling communication of the cylinder with the exhaust port, the exhaust port comprising:
- a wall having a first flow-divider projecting therefrom upstream of the valve stem, the first flow-divider merging gradually and smoothly with the wall in a direction away from the valve stem, the wall also having a second flow-divider projecting therefrom downstream of the valve stem, the second flow-divider merging gradually and smoothly with the wall in a direction away from the valve stem, the flow-dividers cooperating to reduce turbulence in gasses flowing through the exhaust port and around the valve stem.
In an internal combustion engine having a cylinder closed at one end, an exhaust port communicating with the cylinder through the closed end and a poppet exhaust valve disposed in the port and having head and stem portions reciprocal along an axis for controlling communication of the cylinder with the exhaust port, the exhaust port comprising:
- a throat portion opening into the cylinder and defining a valve seat engageable with the exhaust valve;
- an exit portion;
- and
- a connecting portion smoothly joining the throat and exit portions, said portions defining a roof through which extends the exhaust valve stem, the roof having a first flow-divider projecting therefrom and merging gradually and smoothly with the roof in the direction away from the valve stem, and having a second flow-divider projecting therefrom and merging gradually and smoothly with the roof in the direction away from the valve stem, the flow-dividers cooperating to reduce turbulence in gasses flowing through the exhaust port and around the valve stem.
Dependencies are inferred from the claim text.