Engine balancer
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 11, 2001
Grant Date -
N/A
app pub date -
Jan 12, 2000
filing date -
Jan 12, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An internal combustion engine comprises a crankshaft having a helical spur gear mounted for rotation therewith and a balancer. The balancer includes a balancer housing and first and second balance shafts rotatably carried in the balancer housing about laterally spaced parallel axes. A first gear is mounted on the first balance shaft and driven by the helical spur gear at a speed determined by the crankshaft. A second gear is mounted on the second balance shaft for meshing engagement with the first gear for rotation in a direction opposite to the first gear. The helical spur gear and the first and second gears have teeth yielding an involute contact ratio of approximately 3 and a total contact ratio of approximately 5 to thereby reduce gear rattle. One of the balancer gears is aluminum and the other balancer gear is grey cast iron.
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