OUTBOARD ENGINE AND OUTBOARD ENGINE MANUFACTURING METHOD

PROBLEM TO BE SOLVED: To provide an outboard engine capable of using an engine commonly for a catalyst mounted model and a catalyst non-mounted model, and significantly reducing a weight when a catalyst is not mounted, compared to a weight when the catalyst is mounted.SOLUTION: An exhaust manifold i...

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Bibliographic Details
Main Authors SUZUKI TOSHIO, OCHIAI KATSUMI, MAEKAWA MASAYA, NAKAYAMA KOICHI
Format Patent
LanguageEnglish
Japanese
Published 04.12.2014
Subjects
BLASTING
ENGINE PLANTS IN GENERAL
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL
HEATING
LIGHTING
MACHINES OR ENGINES IN GENERAL
MARINE PROPULSION OR STEERING
MECHANICAL ENGINEERING
PERFORMING OPERATIONS
RELATED EQUIPMENT
SHIPS OR OTHER WATERBORNE VESSELS
STEAM ENGINES
TRANSPORTING
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To provide an outboard engine capable of using an engine commonly for a catalyst mounted model and a catalyst non-mounted model, and significantly reducing a weight when a catalyst is not mounted, compared to a weight when the catalyst is mounted.SOLUTION: An exhaust manifold includes a first passage, a second passage, and a third passage. the first passage is connected to plural exhaust ports, and extends in a vertical direction. The second passage is connected to the first passage. The third passage is connected to a lower end of the first passage. A fourth passage is connected to the exhaust manifold, and exhaust air emitted from the exhaust manifold to outside passes through the fourth passage. The first passage extends to a lower side than a first opening connected to an exhaust port of a lowermost cylinder. A second opening is formed on the second passage. A third opening is formed on the third passage. The third passage is connected to the fourth passage via the third opening. The second opening is covered with a first lid body, so as to block circulation of the exhaust air through the second passage. 【課題】本発明の課題は、触媒搭載モデルと触媒不搭載モデルに共通してエンジンを利用することができ、触媒不搭載時の重量を触媒搭載時に比較して大幅に低減することができる船外機を提供することにある。【解決手段】排気マニホールドは、第１通路と、第２通路と、第３通路とを含む。第１通路は、複数の排気ポートに接続され、上下方向に延びている。第２通路は、第１通路に接続される。第３通路は、第１通路の下端部に接続される。第４通路は、排気マニホールドに接続され、排気マニホールドから外部に排出される排気が通る通路である。第１通路は、最も下方のシリンダの排気ポートと接続される第１開口よりも下方まで延びている。第２通路には第２開口が形成されている。第３通路には第３開口が形成されている。第３開口を介して第３通路と第４通路とが接続されている。第２開口が第１蓋体に覆われることにより、第２通路に排気の流通を妨げる処理が施されている。【選択図】図１０
Bibliography:Application Number: JP20140175078