Intake system for internal combustion engines
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsNoritaka Matsuo, Kohichiro Takeuchi, Tokuzi Muramatsu
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Abstract
Several embodiments of induction systems for internal combustion engines that improve charging efficiency over a widespread range, particularly at the lower speeds of the engine. Each embodiment includes a plurality of plenum chambers each of which communicates with the intake passage of the engine between the throttle valve and the served chamber. In one embodiment, the plenum chambers communicate with the induction system through separate branch passages. In other embodiments, the plenum chambers communicate with the induction system through each other.
Claims34
In an induction system for an internal combustion engine having a chamber of variable volume, an intake passage for delivering a charge to the chamber, and throttle valve means for controlling the flow to the chamber through said intake passage, the improvement comprising plenum chamber means defining at least a first effective volume and a second effective volume different from said first effective volume and branch passage means communicating said plenum chamber means with said main induction passage between said throttle valve and said variable volume chamber, said branch passage means having an opening communicating with said induction passage of substantially smaller effective cross-sectional area than said induction passage.
An induction system for an internal combustion engine having a chamber of variable volume, an intake passage for delivering a charge to the chamber and throttle valve means for controlling the flow to the chamber through the intake passage, the improvement comprising a branch passage extending from the intake passage externally of the engine and a plenum chamber surrounding a substantial portion of the length of said branch passage, said branch passage being in communication with said plenum chamber at its other end.
In an induction system for an internal combustion engine having a chamber of variable volume, an intake passage for delivering a charge to the chamber, and throttle valve means for controlling the flow to the chamber through said intake passage, the improvement comprising plenum chamber means defining at least a first effective volume and a second effective volume different from said first effective volume and branch passage means communicating said plenum chamber means only with said main induction passage between said throttle valve and said variable volume chamber.
In an induction system for an internal combustion engine having a chamber of variable volume, an intake passage for delivering a charge only to the chamber, and throttle valve means for controlling the flow to the chamber through said intake passage, the improvement comprising plenum chamber means defining at least a first effective volume and a second effective volume different from said first effective volume and branch passage means communicating said plenum chamber means with said main induction passage between said throttle valve and said variable volume chamber.
Dependencies are inferred from the claim text.