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:
Jan. 28, 1992
Filed:
Aug. 17, 1990
Yasuo Saito, Katsuta, JP;
Toshifumi Usui, Katsuta, JP;
Hirotoshi Kawano, Katsuta, JP;
Shinya Igarashi, Katsuta, JP;
Youichi Furuhashi, Ibaraki, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Automotive Co., Ltd., Ibaraki, JP;
Hitachi Engineering Co., Ltd., Ibaraki, JP;
Abstract
An air meter for an internal combustion engine. The air intake passage of the internal combustion engine includes a main passage and an L-shaped auxiliary passage. The auxiliary passage includes a first flow passage, a second flow passage and a corner portion arrnaged at a corner thereof. The first flow passage communicates to the second flow passage through the corner portion. The first flow passage is disposed in parallel with the main passage and has a hot wire sensor arranged therein. The second flow passage is arranged perpendicularly to the main passage. The first flow passage has a circular radial cross section. The second flow passage is in the shape of a groove with a bottom, the groove having a square cross-section. The first flow passage is open to the corner portion at a level of the bottom of the second flow passage. The corner portion has a circular cross section equal in diameter to and concentric to the circular radial cross section of the first flow passage, the cross section of the corner portion being taken at a level of the bottom of the groove portion and perpendicular to the first flow passage.