Engine balancer with chain drive vibration isolation

Details Engine balancer with chain drive vibration isolation Engine balancer with chain drive vibration isolation

2005-11-01

2005-11-01

Kamen, Noah (Department: 3747)

Internal-combustion engines

Vibration compensating device

C074S574300, C464S180000

Reexamination Certificate

active

06959682

ABSTRACT:
A chain-driven engine balancer has an elastomeric or compliant isolator ring in a balancer drive sprocket to decouple chain whine vibration from an associated balance shaft. The isolator substantially reduces the transmission of chain whine noise to the engine structure. A splined isolator ring is placed between internal and external splines formed on a toothed outer ring and hub respectively of the associated sprocket. The splines are configured to be in loose engagement so that, upon failure of the elastomeric isolator ring, direct engagement of the hub and ring splines with one another will maintain the timing of the balance shafts with respect to the engine crankshaft. In a specific embodiment, application of an isolator ring in only the most heavily loaded sprocket of dual balance shaft sprockets driven in series by the chain eliminates most of the vibration transmission. However, isolation of multiple chain sprockets could be desirable.

REFERENCES:
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patent: 6283076 (2001-09-01), Simpson
patent: 3942761 (1991-08-01), None

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