Torsion damping mechanism for a supercharger
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United States of America Patent
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Jul 4, 1989
Issued Date -
N/A
app pub date -
Jun 27, 1988
filing date -
Jun 27, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An intake manifold (18) for an engine (10) includes a Roots-type supercharger (26) having a torsion damping mechanism (54) for reducing audible rattle of timing gears (72,74) which prevents contact of meshed lobes (28a,29a) of the supercharger rotors (28,29). The damping mechanism includes torsion springs (98,100) preloaded against each other. Torsion spring (98) has a low spring rate for attenuating torque fluctions or spikes during non-supercharging, low engine speed modes of operation. Spring (100) has a relatively high spring rate and functions as a shock absorber during engine shut down and during rough engine operation.
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