Engine component including breather apparatus, and engine body incorporating same

摘要

An engine body includes a crankcase with a crank chamber therein, a cylinder block attached to the crankcase, and a breather passage which selectively permits fluid communication between the crank chamber and an area outside of the crank chamber. The engine body includes a one-way valve between the crank chamber and the breather passage, which allows a one-way flow of gases from the crank chamber to the breather passage. The one-way valve is pressure-operated and is operatively attached to a side wall of the engine body proximate a cylinder sleeve. The one-way valve may be mounted in a mounting window in a side wall of the crankcase, and a timing chamber may function as the breather passage. In an illustrative embodiment, the one-way valve includes a base plate having a valve hole formed therein, and a flexible reed valve plate with one end affixed to the base plate.

主权项

1. An engine body comprising:
a crankcase having a crank chamber formed therein and a breather passage outside of the crank chamber for permitting fluid communication between the crank chamber and an area outside of the engine body; a breather apparatus comprising a one-way valve interposed between the crank chamber and the breather passage, wherein the one-way valve is configured to allow a one-way gas flow therethrough from the crank chamber to the breather passage, wherein the one-way valve is a pressure-responsive valve which is operatively attached to a side wall of the engine body proximate a cylinder sleeve thereof, wherein a timing chamber, which houses a timing power transmission device therein, extends between the crankcase and a cylinder block of the engine body adjacent to the cylinder sleeve, and wherein the side wall on which the one-way valve is mounted is a side wall of the crankcase interposed between the timing chamber and the crank chamber, and wherein the timing chamber functions as a part of the breather passage.