Internal combustion engine air intake manifold with a retractable element having an acoustic bore
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jun 13, 2000
Grant Date -
N/A
app pub date -
Sep 17, 1998
filing date -
Mar 19, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A manifold with air ducts that each include a downstream tube and two upstream tubes of which one is short and the other long, and a pivotable member with an acoustic through-bore between the upstream tubes and the downstream tube. When the member is in one of its end positions, one of the upstream tubes communicates with the downstream tube while the other upstream tube is sealed, and when it is in the other end position, the other upstream tube communicates with the downstream tube while the first upstream tube is sealed. The member is retractable and mounted in a housing and has two contactless-sliding side surfaces extending perpendicularly to the pivot axis of the member and frictionally engaging a respective one of the two side surfaces of the housing as the member is pivoted, whereby a laminar effect is generated which ensures good lateral sealing between the member and the housing. The manifold may be used in internal combustion injection engines, particularly for motor vehicles.
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