| 摘要 |
An exhaust pipe for an internal combustion engine is formed through its side-wall with an internally threaded opening for reception of an externally threaded bearing having a bore therethrough in which the throttle valve shaft is rotatably mounted with clearance, with the throttle valve carried at its inner end within the exhaust pipe and with an operating lever at its outer end. The shaft is formed with a radially projecting collar having an outwardly converging conical surface and the shaft is spring loaded to urge such surface into flush sealing engagement with a conformingly shaped conical bearing face of the bearing, which functions both to seal the bore and to center the valve shaft therein.
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