Low emission exhaust system for a motorized scooter

Abstract

A catalytic converter is especially adapted for placement to a motorized scooter. The scooter includes a front steered wheel, a rear driven wheel, and a structural tube extending between the wheels. A motor driving the rear driven wheel has an exhaust emission line. An exhaust tube having first and second open ends is provided. The exhaust tube is mounted through a sidewall of the main structural tube with a first end disposed exterior of the main structural tube and a second end discharging interiorly of the main structural tube. The exhaust tube has a catalytic converter preferably at the second end thereof. A flexible connection is provided between the exhaust emission of the motor and the first end of the exhaust tube. In operation, exhaust flows to heat the catalytic converter concentrically of the main structural tube and the converter operates exothermically at high temperature at the second end of the exhaust tube. Gas passing through the converter expands and cools, typically reverses flow about the exhaust tube, and discharges from the main structural tube. There results optimum catalytic operation, tamperproof location, optimum muffling, and safe heat discharge from the scooter body.