Oxygen sensor arrangement for watercraft

• Main Author: OZAWA; SHIGEYUKI
• Format: Patent
• Language: English
• Published: 30.05.2000
• Edition: 7
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROLLING COMBUSTION ENGINES; ENGINE PLANTS IN GENERAL; EQUIPMENT FOR SHIPPING; 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; INTERNAL-COMBUSTION PISTON ENGINES; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LIGHTING; MACHINES OR ENGINES IN GENERAL; MEASURING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PHYSICS; RELATED EQUIPMENT; SHIPS OR OTHER WATERBORNE VESSELS; STEAM ENGINES; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; TESTING; TRANSPORTING; WEAPONS

A marine engine is constructed having an improved component layout so as to reduce the risk of water contact with an oxygen sensor of the engine. This advantage is accomplished by providing a collection chamber that promotes drainage of any water that may enter into the chamber through an exhaust system. In one form, the oxygen sensor chamber has a lower wall and a passage thereof, both slanted downward toward the corresponding cylinder of the engine. The oxygen sensor may be shielded by a portion of the engine (e.g., by the induction system or the cylinder block) or by a portion of the corresponding exhaust system. In another variation, the oxygen sensor can be located for easily access in order to facilitate service and replacement.