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US 6,681,750 B2Granted
Blow-by gas ventilation system for engine
AssigneeYamaha Marine Kabushiki Kaisha
InventorTetsuya Mashiko
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AssigneeYamaha Marine Kabushiki Kaisha
InventorTetsuya Mashiko
Estimating the term…
A blow-by gas ventilation system particularly suited for use with a small watercraft includes a oil separation chamber preferably disposed within a plenum chamber defined by an air intake box. An inlet tube permits blow-by gases to move from the crankcase chamber of the engine to the oil separation chamber. An outlet allows blow-by gases to move from the oil separation chamber to the plenum chamber. Desirably, an outlet tube connects the outlet to an opening in an intake port of the induction system to discharge blow-by gases into the intake port. The oil separation chamber may be defined by a cover member, along with a portion of the interior surface of the air intake box.
A watercraft comprising a hull defining an engine compartment, an internal combustion engine disposed in the engine compartment, a propulsion device driven by the engine, the engine having an engine body defining a crankcase and at least one combustion chamber therein, a lubrication system for supplying lubricant to at least the crankcase of the engine, an induction system configured to guide air along an induction airflow path to the combustion chamber for combustion therein, the induction system comprising a plenum chamber, a blow-by gas ventilation system for allowing blow-by gasses to move along a ventilation flow path from the crankcase to the plenum chamber, the blow-by gas ventilation system comprising an oil separation chamber positioned within the plenum chamber, wherein the ventilation flow path passes through the oil separation chamber.
A watercraft comprising a hull defining an engine compartment, an internal combustion engine disposed in the engine compartment, a propulsion device driven by the engine, the engine having an engine body defining a crankcase and at least one combustion chamber therein, a lubrication system for supplying lubricant to at least the crankcase of the engine, an induction system configured to guide air along an induction airflow path to the combustion chamber for combustion therein, the induction system comprising a plenum chamber and a throttle body defining an intake port, a fuel delivery system for delivering fuel to the combustion chamber, the fuel delivery system comprising a fuel injector communicating with the intake port, a blow-by gas ventilation system for allowing blow-by gasses to move along a ventilation flow path from the crankcase to the plenum chamber, the blow-by gas ventilation system comprising an oil separation chamber positioned within the plenum chamber, wherein the ventilation flow path passes through the oil separation chamber.
A watercraft comprising a hull defining an engine compartment, an internal combustion engine disposed in the engine compartment, a propulsion device driven by the engine, the engine having an engine body defining a crankcase and at least one combustion chamber therein, a lubrication system for supplying lubricant to at least the crankcase of the engine, an induction system configured to guide air along an induction airflow path to the combustion chamber for combustion therein, the induction system comprising at least one throttle body having a throttle valve and an inlet duct connected to the at least one throttle body, the throttle body and inlet duct at least partially defining an intake passage, a blow-by gas ventilation system comprising an inlet communicating with the crankcase, an outlet communicating with the intake passage upstream of the throttle valve and a ventilation passage connecting the inlet and the outlet, wherein the induction system additionally comprises an air filter element, the outlet being disposed on a side of the intake passage opposite the air filter element.
A watercraft comprising a hull defining an engine compartment, an internal combustion engine disposed in the engine compartment, a propulsion device driven by the engine, the engine having an engine body defining a crankcase and at least one combustion chamber therein, a lubrication system for supplying lubricant to at least the crankcase of the engine, an induction system configured to guide air along an induction airflow path to the combustion chamber for combustion therein, the induction system comprising at least one throttle body having a throttle valve and an inlet duct connected to the at least one throttle body, the throttle body and inlet duct at least partially defining an intake passage, a blow-by gas ventilation system comprising an inlet communicating with the crankcase, an outlet communicating with the intake passage upstream of the throttle valve and a ventilation passage connecting the inlet and the outlet, wherein the induction system additionally comprises a plenum chamber, the at least one throttle body being disposed within the plenum chamber.
A watercraft comprising a hull defining an engine compartment, an internal combustion engine disposed in the engine compartment, a propulsion device driven by the engine, the engine having an engine body defining a crankcase and at least one combustion chamber therein, a lubrication system for supplying lubricant to at least the crankcase of the engine, an induction system configured to guide air along an induction airflow path to the combustion chamber for combustion therein, the induction system comprising at least one throttle body having a throttle valve and an inlet duct connected to the at least one throttle body, the throttle body and inlet duct at least partially defining an intake passage, a blow-by gas ventilation system comprising an inlet communicating with the crankcase, an outlet communicating with the intake passage upstream of the throttle valve and a ventilation passage connecting the inlet and the outlet, wherein the lubrication system additionally comprises a lubricant reservoir, a second inlet communicating with the reservoir and wherein the ventilation passage comprises a first portion and a second portion, the first portion of the ventilation passage connecting the inlet to the outlet of the intake passage and the second portion of the ventilation passage connecting the second inlet to the first portion of the ventilation passage.
A watercraft comprising a hull defining an engine compartment, an internal combustion engine disposed in the engine compartment, a propulsion device driven by the engine, the engine having an engine body defining a crankcase and at least one combustion chamber therein, a lubrication system for supplying lubricant to at least the crankcase of the engine, an induction system configured to guide air along an induction airflow path to the combustion chamber for combustion therein, the induction system comprising at least one throttle body having a throttle valve and an inlet duct connected to the at least one throttle body, the throttle body and inlet duct at least partially defining an intake passage, a blow-by gas ventilation system comprising an inlet communicating with the crankcase, an outlet communicating with the intake passage upstream of the throttle valve and a ventilation passage connecting the inlet and the outlet, additionally comprising an oil separation chamber in communication with the ventilation passage and disposed intermediate the inlet and the outlet, wherein the induction system additionally comprises a plenum chamber, the oil separation chamber being disposed within the plenum chamber.
A watercraft comprising a hull defining an engine compartment, an internal combustion engine disposed in the engine compartment, a propulsion device driven by the engine, the engine having an engine body defining a crankcase and at least one combustion chamber therein, a lubrication system for supplying lubricant to at least the crankcase of the engine, an induction system configured to guide air along an induction airflow path to the combustion chamber for combustion therein, the induction system comprising a plenum chamber, a blow-by gas ventilation system for allowing blow-by gasses to move along a ventilation flow path from the crankcase to the plenum chamber, means for separating lubricating oil from the blow-by gas, the means being positioned within the plenum chamber.
A watercraft comprising a hull defining an engine compartment, an internal combustion engine disposed in the engine compartment, a propulsion device driven by the engine, the engine having an engine body defining a crankcase and at least one combustion chamber therein, a lubrication system for supplying lubricant to at least the crankcase of the engine, an induction system configured to guide air along an induction airflow path to the combustion chamber for combustion therein, the induction system comprising a plenum chamber, an air filter element and at least one throttle body, the air filter element being positioned upstream from the at least one throttle body, a blow-by gas ventilation system for allowing blow-by gasses to move along a ventilation flow path from the crankcase to the plenum chamber, the blow-by gas ventilation system comprising an oil separation chamber, the air filter element, the at least one throttle body and the oil separation chamber being disposed within the plenum chamber, the at least one throttle body being positioned between the air filter element and the oil separation chamber.
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture:…
Internal combustion engine [ICE] based vehicles: improving ICE efficiencies
Supplying combustion engines in general with combustible mixtures or constituents thereof
Low-carbon transport
Term ended 29 Jan 2022 (estimated)
This application is based on and claims priority to Japanese Patent Application No. 2000-353626, filed Nov. 20, 2000, the entire contents of which are hereby expressly incorporated by reference.
1. Field of the Invention
The present invention relates to a blow-by gas ventilation system for an engine. More specifically, the present invention relates to a blow-by gas ventilation system particularly adapted for use in a small watercraft.
These and other features, aspects and advantages of the present invention will now be described with reference to the drawings of a preferred embodiment which is intended to illustrate and not to limit the invention. The drawings comprise 4 figures.
FIG. 1 is a side elevational view of a personal watercraft of the type powered by an engine configured in accordance with a preferred embodiment of the present invention. Several of the internal components of the watercraft (e.g., the engine) are illustrated in phantom;
FIG. 2 is a perspective view of the engine and an induction system arrangement of FIG. 1;
With reference to FIG. 1, a watercraft 10 employs an internal combustion engine 12 configured in accordance with a preferred embodiment of the present invention. The described engine configuration has particular utility with personal watercraft, and thus, is described in the context of personal watercraft. The engine configuration, however, can be applied to other types of water vehicles as well, such as, for example, small jet boats, all-terrain vehicles, and snowmobiles.
The personal watercraft 10 includes a hull 14 formed with a lower hull section 16 and an upper hull section or deck 18. Both the hull sections 16, 18 are made of, for example, a molded fiberglass reinforced resin or a sheet molding compound. The lower hull section 16 and the upper hull section 18 are coupled together to define an internal cavity 20 (FIG. 3). A bond flange 22 defines an intersection of both the hull sections 16, 18.
A control mast 24 extends upwardly to support a handle bar 26. The handle bar 26 is provided primarily for controlling the directions in which the water jet propels the watercraft 10. Grips are formed at both ends of the bar 26 so that the rider can hold them for that purpose. The handle bar 26 also desirably carries other control units such as, for example, a throttle lever 58 that is used for control of running conditions of the engine 12.