Intake control device for internal combustion engine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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May 31, 1994
Grant Date -
N/A
app pub date -
Apr 5, 1993
filing date -
Apr 20, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An intake control device for an internal combustion engine having a body member 1 and a throttle valve 5 disposed within an air passage 4 . The external circular edge of the throttle valve 5 is divided, with a throttle shaft 6 into a first edge portion 5a which moves toward the upstream side of the air passage 4 and a second edge portion 5b which moves toward the downstream side of the air passage 4. On an inner wall 7 of the air passage 4 of the body member 1 are formed an upstream-side spherical wall surface 8 in a position facing the first edge portion 5a and a downstream-side spherical wall surface 9 in a position facing the second edge portion 5b. A first clearance 13 formed between the first edge portion 5a and the upstream-side spherical wall surface 8 is smaller than a second clearance 14 formed between the second edge portion 5b and the downstream-side spherical wall surface; the second edge portion 5b of the throttle valve 5 may not come into contact with the downstream-side spherical wall surface 9 even when a high intake manifold vacuum is built on the downstream side of the throttle valve 5 when the throttle valve 5 is in a position for closing the air passage 4.
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