Internal-combustion engines – Charge forming device – Supercharger
Patent
1994-10-31
1995-06-13
Koczo, Michael
Internal-combustion engines
Charge forming device
Supercharger
4151221, F02B 3340, F02B 3904
Patent
active
054233046
ABSTRACT:
A mechanically driven centrifugal air compressor for an internal combustion engine has an impeller shaft supported in a compressor housing with journal bearings. A helical pinion gear is formed on one end of the impeller shaft and an impeller is attached to the other end. A thrust ring mounted on the impeller shaft near the impeller is sandwiched by a thrust bearing and the nearest journal bearing to axially locate the impeller shaft. An integral pulley and internal helical ring gear of molded plastic is rotatably supported on the compressor housing with the pulley engaged by a belt that is driven by a pulley of larger diameter fixed to an engine crankshaft. The ring gear meshes with the pinion gear to provide a high overdrive speed ratio at a low noise level in series with the belt and pulley drive from the engine crankshaft which provides a low overdrive speed ratio. The thrust bearing bears the axial load on the impeller shaft imposed by air pressure acting on the impeller and the lead of the helical pinion gear is set in a direction so that the gears impose an axial force on the impeller shaft that is opposite the impeller imposed axial force to substantially reduce the axial load borne by the thrust bearing.
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Black Gregg T.
Lawrence Thomas G.
Chrysler Corporation
Koczo Michael
MacLean Kenneth H.
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