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US 5,074,258 AGranted
Intake system for multiple-cylinder engine
AssigneeMazda Motor Corporation
InventorsMitsuo Hitomi, Toshihiko Hattori, Masashi Marubara, Mikihito Fujii
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AssigneeMazda Motor Corporation
InventorsMitsuo Hitomi, Toshihiko Hattori, Masashi Marubara, Mikihito Fujii
Estimating the term…
An intake system for a multiple-cylinder engine has a plurality of discrete intake passages which are substantially equal to each other in length and are connected to the respective cylinders at their downstream ends. The upstream ends of the discrete intake passages are merged into an integrated chamber, and an upstream side intake passage communicates the integrated chamber with the atmosphere. The integrated chamber has an upstream side end face and a downstream side end face, and the cross-sectional area of the integrated chamber increases from the upstream side end face to the downstream side end face, the upstream side intake passage having opening into the integrated portion in the upstream side end face, and the discrete intake passages respectively having openings into the integrated chamber in the downstream side end face. The area of the upstream side and downstream side end faces of the integrated chamber S.sub.0 S.sub.1, the sum of the areas of the openings of the discrete intake passages into the integrated chamber S.sub.N and the distance H between the upstream side and downstream side end faces of the integrated chamber satisfy the following formulae ##EQU1##
An intake system for a multiple-cylinder engine comprising a plurality of discrete intake passages which are substantially equal to each other in length and are connected to the respective cylinders at their downstream ends, an integrated chamber into which the upstream ends of the discrete intake passages are merged, and an upstream side intake passage which communicates the integrated chamber with the atmosphere, the integrated chamber having an upstream side end face and a downstream side end face, the cross-sectional area of the integrated chamber increasing from the upstream side end face to the downstream side end face, the upstream side intake passage opening into the integrated portion in the upstream side end face, and the discrete intake passages respectively having openings into the integrated chamber in the downstream side end face, characterized in that formulas ##EQU4## are satisfied wherein S.sub.0 and S.sub.1 respectively represent the area of the upstream side and downstream side end faces of the integrated chamber, S.sub.N represents the sum of the areas of the openings of the discrete intake passages into the integrated chamber, and H represents the distance between the upstream side and downstream side end faces of the integrated chamber.
An intake system for a multiple-cylinder engine comprising a plurality of discrete intake passages which are substantially equal to each other in length and are connected to the respective cylinders at their downstream ends, an integrated chamber into which the upstream ends of the discrete intake passages are merged, and upstream side intake passage means which communicates the integrated chamber with the atmosphere, the integrated chamber having an upstream side end face and a downstream side end face, the cross-sectional area of the integrated chamber increasing from the upstream side end face to the downstream side end face, the upstream side intake passage means opening into the integrated chamber in the upstream side end face, and the discrete intake passages respectively having openings into the integrated chamber in the downstream side end face, characterized in that
An intake system for a multiple-cylinder engine comprising a plurality of discrete intake passages which are substantially equal to each other in length and are connected to the respective cylinders at their downstream ends, a first integrated chamber into which the upstream ends of the discrete intake passages are merged, and upstream side intake passage means which communicates the first integrated chamber with the atmosphere, the first integrated chamber having an upstream side end face and a downstream side end face, the cross-sectional area of the first integrated chamber increasing from the upstream side end face to the downstream side end face, the upstream side intake passage means opening into the first integrated chamber in the upstream side end face, and the discrete intake passages respectively having openings into the first integrated chamber in the downstream side end face, characterized in that said upstream side intake passage means comprises a downstream side end portion including a plurality of branch passages which are connected to the first integrated chamber at their downstream side end and are merged into a second integrated chamber at their upstream side ends, and an upstream side end portion which opens to the atmosphere at its upstream side end and connected to the second integrated chamber at its downstream side end, the branch intake passages of the downstream side end portion being smaller than the discrete intake passages in number and the openings of the branch passages into the first integrated chamber uniformly overlap with the openings of the discrete intake passages into the second integrated chamber.
Dependencies are inferred from the claim text.