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:
Oct. 07, 1997
Filed:
Sep. 29, 1995
Tetu Wada, Wako, JP;
Kouichi Oka, Wako, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A vertical-type multicylinder engine includes a plurality of combustion chambers, an inlet muffler having a plurality of air intake passages, and a blow-by gas entry opening for introducing blow-by gas into the muffler, and a plurality of throttle valve devices provided downstream of the intake passages and upstream of the valve devices in corresponding relation thereto. The inlet muffler has a plurality of blow-by gas distributing paths that are formed inside the muffler to distributively direct the blow-by gas introduced via the blow-by gas entry opening to the corresponding throttle valve devices. Thus, the entry opening, distributing paths and intake passages of the muffler and the throttle valve devices together define a structure for returning the blow-by gas to an upstream portion of the engine intake system. The distributing paths have different sizes that become progressively greater as the respective distances, from the blow-by gas entry opening, of the paths increase. The blow-by gas returning structure thus formed serves to minimize inter-cylinder differences in the amounts of blow-by gas flowing into the individual throttle valve devices and hence in combustion conditions in the combustion chambers.