The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 1998
Filed:
Sep. 20, 1996
Shigeo Tamaki, Hitachinaka, JP;
Shigeru Tokumoto, Hitachinaka, JP;
Hitachi, Ltd., , JP;
Abstract
An intake valve control apparatus for an internal combustion engine eliminates adverse effects due to accumulation of deposit materials downstream of the throttle valve to always ensure a smooth movement of the throttle valve. The apparatus has a body member forming an intake air passage and a throttle valve rotatably mounted therein. The throttle valve has a first outer circumference which rotates toward the upstream side thereof and a second outer circumference which rotates toward the downstream side thereof. A wall surface inside the body member opposite the first outer circumference of throttle valve is spherical, and wall surface of the body member opposite the second outer circumference of the throttle valve is cylindrical.