Scavenging insert for an engine
AssigneeElectrolux Home Products, Inc.
InventorsPaul D. Watkins, Paul A. Warfel, Scott W. Ericson
Life of this patent
Estimating the term…
Abstract
An internal combustion engine having a cylinder chamber, a crankcase in fluidic communication with the cylinder chamber, and a scavenging conduit insert providing for the communication between the cylinder chamber and the crankcase. The scavenging insert may form a part of a surface against which a piston slides.
Claims16
An internal combustion engine, comprising:
- a cylinder chamber having a cylindrically hollow portion disposed therein;
- a piston slidably engaged with the cylindrically hollow portion;
- a crankcase in fluidic communication with the cylinder chamber;
- at least one scavenging conduit insert providing for the communication between the cylinder chamber and the crankcase, wherein the scavenging insert provides at least a segment of the cylindrically hollow portion and wherein the scavenging conduit insert is retained by a main crankshaft bearing.
A scavenging conduit insert for an internal combustion engine, wherein the scavenging conduit insert comprises:
- a body portion;
- a first flange portion engaged with a first end of the body portion;
- and
- a second flange portion engaged with a second end of the body portion, wherein the first arm and the second arm are in a spaced apart relationship and wherein the scavenging conduit insert is retained by a main crankshaft bearing.
A scavenging conduit insert for an internal combustion engine, wherein the scavenging conduit insert comprises:
- a body portion;
- a first flange portion engaged with a first end of the body portion;
- a second flange portion engaged with a second end of the body portion, wherein the first arm and the second arm are in a spaced apart relationship;
- and
- at least one projection extending from the body portion for providing a plurality of ports for communication between a cylinder chamber and a crankcase.
A method of making a two-stroke engine, the method comprising the steps of:
- utilizing a pressure die casting process to make the cylinder chamber of said engine with a scavenging conduit open to the interior space of said cylinder chamber;
- inserting at least one scavenging conduit insert between said interior and said scavenging conduit;
- and
- retaining said scavenging conduit insert by mating a main crankshaft bearing thereto.
An internal combustion engine comprising:
- a cylinder chamber having a cylindrically hollow portion disposed therein;
- a piston slidably engaged with the cylindrically hollow portion;
- a crankcase in fluidic communication with the cylinder chamber;
- and
- at least one scavenging conduit insert providing for the communication between the cylinder chamber and the crankcase, wherein the scavenging insert provides at least a segment of the cylindrically hollow portion, and the scavenging insert extends to provide a portion of a conduit opening into the cylinder chamber and a portion of a conduit opening into the crankcase.
Dependencies are inferred from the claim text.