Oxidation catalytic converter system for small spark ignited engines
First Claim
1. An oxidation catalytic converter system for small spark ignited engines comprising a housing containing a catalyst having an inlet and an outlet, a jet pipe extending into said inlet through which exhaust gases pass through said housing and out said outlet, an annular air gap between said inlet and said jet pipe through which ambient air is drawn into said housing by the exhaust gases entering said housing from said jet pipe, and means for mounting said housing directly to an engine chassis independently of the engine, whereby said housing is vibrationally isolated from the engine.
6 Assignments
0 Petitions
Accused Products
Abstract
An oxidation catalytic converter system for small spark ignited engines includes a housing containing a catalyst, an inlet for receiving exhaust gases from the engine, and an outlet for discharge of the exhaust gases from the housing after passing through the catalyst. Attached to the engine exhaust is a jet pipe that extends into the inlet in noncontacting relation to the housing, whereby the catalytic converter is vibrationally isolated from the jet pipe. Surrounding the jet pipe is an annular air gap through which ambient air is drawn into the housing and mixed with the exhaust gases for enhanced cooling and catalyst performance.
33 Citations
15 Claims
- 1. An oxidation catalytic converter system for small spark ignited engines comprising a housing containing a catalyst having an inlet and an outlet, a jet pipe extending into said inlet through which exhaust gases pass through said housing and out said outlet, an annular air gap between said inlet and said jet pipe through which ambient air is drawn into said housing by the exhaust gases entering said housing from said jet pipe, and means for mounting said housing directly to an engine chassis independently of the engine, whereby said housing is vibrationally isolated from the engine.
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10. An oxidation catalytic converter system for small spark ignited engines comprising a catalytic converter housing containing a catalyst, said housing having an inlet and an outlet, a jet pipe extending into said inlet for introducing exhaust gases from the engine into said catalytic converter, with an annular air gap between said jet pipe and said inlet through which ambient air is drawn by the flow of exhaust gases from said jet pipe into said catalytic converter and adjustment means for establishing a depth of insertion of said jet pipe through said inlet into said housing, said jet pipe extending through said inlet into said housing a predetermined depth to achieve a desired quantity of ambient air dilution for a given size and type of engine.
- 11. In combination, a small spark ignited engine mounted on an engine chassis, and an oxidation catalytic converter system for said engine, said system comprising a housing containing a catalyst, an inlet for receiving exhaust gases from said engine, an outlet for discharge of the exhaust gases from said housing after passing through said catalyst, jet pipe attached to the engine exhaust, said jet pipe extending into said inlet in noncontacting relation to said housing, and means for mounting said housing directly to said engine chassis independently of said engine, whereby said housing is vibrationally isolated from said engine.
- 14. A method of achieving an established insertion depth and concentricity of a jet pipe within an inlet to a catalytic converter housing comprising the steps of inserting an alignment aid tool through a first pair of keyhole shaped slots through diametrically opposite sides of the catalyst housing, the tool having a round rod that is received in a round opening of said slots and a pair of spaced apart centering tabs extending perpendicularly from the rod that are received in a radial slot portion of the slots extending at an angle away from the inlet, the centering tabs being spaced apart a distance slightly greater than the outside dimensions of the end of the jet pipe received within the inlet, the round opening of the slots having a forwardmost edge that is axially spaced from the inlet by a distance corresponding to the established insertion depth of the jet pipe, locating the centering tabs within the housing so that the centering tabs are equally spaced on opposite sides of the axial center of the housing, rotating the rod until the centering tabs face the inlet, and adjusting the position of the housing relative to the jet pipe until the end of the jet pipe touches the rod in between the centering tabs.
Specification