ENGINE UNIT AND RIDE TYPE VEHICLE

• Main Authors: WAKIMURA MAKOTO, NISHIGAKI MASATAKA, ARAKI YUJI, ISHIZAWA KAZUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 31.08.2017
• Subjects: ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES; ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; 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; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; STEAM ENGINES; TRANSPORTING; VEHICLES IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To provide a single-cylinder four-stroke engine unit including a horizontal cylinder part, capable of simplifying the configuration of an exhaust device and actualizing early activation of a catalyst, and to provide a ride type vehicle.SOLUTION: The single-cylinder four-stroke engine unit includes a main catalyst having the highest emission control ability in an exhaust passage. The main catalyst is arranged of which a virtual straight line f2 directed from the upstream end center of the main catalyst to the downstream end center and a virtual straight line f1 directed from the center of an exhaust port 26H of a single-cylinder four-stroke engine to the center of a joint part 34a between an exhaust pipe and a noise eliminator are inclined in view from the vertical direction so that sites are located in one direction perpendicular to a cylinder axial line L1 in proportion as located in one direction parallel to the cylinder axial line L1, and which at least partly overlaps with a quadrilateral (S1-S4) defined by the cylinder axial line L1, a crank axial line L2, the exhaust port 26H and the joint part 34a, in view from the vertical direction.SELECTED DRAWING: Figure 4 【課題】排気装置の構造をシンプルにでき、且つ、触媒の早期活性を図ることのできる、水平シリンダ部を備えた単気筒４ストロークエンジンユニット、並びに、鞍乗型車両を提供する。【解決手段】排気通路内で最も高い浄化能力を有するメイン触媒を有する。鉛直方向に見て、メイン触媒の上流端中央から下流端中央へ向いた仮想直線ｆ２と、単気筒４ストロークエンジンの排気口２６Ｈの中央から排気管と消音器との接合部３４ａの中央へ向いた仮想直線ｆ１とが、シリンダ軸線Ｌ１に平行な一つの方向に位置する部位ほど、シリンダ軸線Ｌ１に垂直な一つの方向に位置するように傾斜して配置され、且つ、鉛直方向に見て、シリンダ軸線Ｌ１、クランク軸線Ｌ２、排気口２６Ｈ、接合部３４ａにより規定される四辺形（Ｓ１〜Ｓ４）と、少なくとも一部が重なる。【選択図】図４