Torsion damping mechanism for a supercharger

Internal-combustion engines – Charge forming device – Supercharger

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Details

418206, 464 57, 464 66, 464 77, F02B 3338, F16D 312

Patent

active

048440442

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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