Small air-cooled engine with catalytic converter with ruthenium catalyst
AssigneeBriggs & Stratton Corporation
InventorsJacob Zuehl, Michael D. Pitcel
Life of this patent
Estimating the term…
Abstract
A small-air cooled internal combustion engine includes an engine block including a cylinder, a piston within the cylinder, a crankshaft configured to be driven by the piston, a blower system including a fan that is configured to pull air over the engine block, a fuel system for supplying an air-fuel mixture to the cylinder, and an exhaust system for removing exhaust from the cylinder. The exhaust system comprises an exhaust inlet, a muffler and, a catalytic converter including a catalyst. The catalyst comprises a precious metal loading having ruthenium as a primary element by mass.
Claims22
A small air-cooled internal combustion engine comprising:
- an engine block including a cylinder;
- a piston within the cylinder;
- a crankshaft configured to be driven by the piston;
- a blower system including a fan, the fan configured to direct cooling air over the engine block;
- an air-fuel mixing device for supplying an air-fuel mixture to the cylinder for combustion;
- and
- an exhaust system for removing exhaust from the cylinder, the exhaust system comprising:
- an exhaust port formed in the cylinder to allow exhaust to exit the cylinder following combustion;
- and
- a catalytic converter fluidly coupled to the exhaust port and configured to receive exhaust from the exhaust port, the catalytic converter including a catalyst, wherein the catalyst comprises a precious metal loading having ruthenium as a primary element by mass.
(canceled)
14-20. (canceled)
A catalytic converter for a small air-cooled internal combustion engine having a displacement of one thousand cubic centimeters or less, the catalytic converter comprising:
- an inlet;
- a chamber fluidly coupled with the inlet, the chamber supporting a substrate having a catalyst disposed thereon, wherein the catalyst comprises a precious metal loading having ruthenium as a primary element by mass;
- and
- an outlet fluidly coupled with the chamber and configured to direct gas outwardly away from the chamber.
Dependencies are inferred from the claim text.