Replaceable combustion chamber insert for two cycle engines...

Details Replaceable combustion chamber insert for two cycle engines... Replaceable combustion chamber insert for two cycle engines...

2000-11-14

2002-03-12

McMahon, Marguerite (Department: 3747)

Internal-combustion engines

Particular piston and enclosing cylinder construction

Cylinder head

Reexamination Certificate

active

06354260

ABSTRACT:

REFERENCE TO PENDING APPLICATIONS
This application is not related to any pending applications.
REFERENCE TO MICROFICHE APPENDIX
This application is not referenced in any microfiche appendix.
TECHNICAL FIELD OF THE INVENTION
The invention relates generally to internal combustion engines and more specifically to a replaceable combustion chamber insert for two cycle internal combustion engines.
BACKGROUND OF THE INVENTION
Improvements to enhance the performance and combustion efficiency of internal combustion engines are well represented in the prior art. For example:
U.S. Pat. No. 1,260,859 issued on Mar. 26, 1918 to A. Bie discloses a cylinder construction for internal combustion engines, and is concerned particularly with the heads thereof, being designed more especially, though not necessarily exclusively, for constant pressure oil engines having their fuel injection valves arranged centrally in the heads.
U.S. Pat. No. 1,914,940 issued on Jun. 20, 1933 to R. Chilton discloses an improvement in cooling internal combustion engine cylinders and associated parts.
U.S. Pat. No. 4,519,359 issued on May 28, 1985 to Ulf Dworak et al and subsequently assigned to Feldmuhle Aktiengesellschaft discloses a mullite plate. In a cylinder head of a piston engine, the surface of the cylinder head facing the combustion chamber is covered by a plate having openings for valves, spark plugs or injection nozzles. The plate consists of mullite containing 2 to 30% of volume of zirconium oxide and/or hafnium oxide embedded therein, plus 0 to 3 mole-percent of oxides of magnesium, calcium or yttrium, with respect to the zirconium and/or hafnium oxide, and of no more than 0.5%, by weight, of other oxidic impurities.
U.S. Pat. No. 4,530,341 issued on Jul. 23, 1985 to Bengt N. J. Palm and subsequently assigned to Saab-Scania Aktiebolag discloses a piston engine having at least one heat-insulated combustion chamber, and parts for said engine. Improved heat insulating of a combustion chamber in an internal combustion engine is a heat-resistant body in at least one surface, which is intended to at least partly limit a combustion chamber. A support body supports the heat-resistant body, said bodies each having facing mantle surfaces. Between said bodies there is a heat-insulating element of a material having a lower coefficient of thermal expansion and a lower modulus of elasticity than the material in either one of said bodies. The bodies and the element are held together at the mantle surfaces by means of a shrink fit.
U.S. Pat. No. 4,562,798 issued on Jan. 7, 1986 to Cornelis J. Van Os and subsequently assigned to Noord-Nederlandsche Machinefabriek B.V. discloses a cylinder head locking construction for cylinders formed or placed in a casing of a motor, in which high working pressures occur. A segmented ring is partially placed in an annular groove formed in the casing of the motor transversely to the axis of the cylinder head. In operation a portion of the ring projecting from the groove rests on an adjacent portion of the cylinder head. A clamping ring is secured around a raised central portion of the cylinder head and presses the segments in the direction of the cylinder head portion, and at the same time prevents radially inward movement of the segments. The segments are pushed inwardly into contact with the clamping ring by a thrust member such as an O-ring.
U.S. Pat. No. 4,630,345 issued on Dec. 23, 1986 to Dieter Lutz and subsequently assigned to SACHS-Systemtechnik GmbH discloses a cylinder unit of a cylinder-piston-combustion engine comprising a cylinder housing and a lining unit inserted into the cylinder housing. The lining unit consists of a cylindrical liner sleeve and a terminal wall and encloses a combustion space. The terminal wall is integral with the liner sleeve. The lining unit is manufactured by a non-cutting manufacturing method like cold impact forming, hot impact forming, deep drawing, tube reshaping, press molding or injection molding.
U.S. Pat. No. 4,646,692 issued on Mar. 3, 1987 to Andreas Deuber et al and subsequently assigned to Alcan Aluminiumwerk Nurnberg GmbH discloses a component for internal combustion engines and a process for its production. The invention concerns components for internal combustion engines with heat resistant combustion chamber inserts, especially components made of light metal with casted porous ceramic inserts positioned by casting around the basic material, in which in order to lower the gas pressure which builds up under the inserts, at least one gas pressure release bore hole is provided in the basic material of the component which leads to the bottom of said insert. The invention further describes a process for the production of these components in which the insert is first fixed in its position relative to the basic element and thereafter the bore holes are produced in the basic material.
U.S. Pat. No. 5,211,153 issued on May 18, 1993 to Minoru Yonekawa et al and subsequently assigned Kloritz Corporation discloses a two-cycle internal combustion gasoline engine cylinder. The two-cycle engine cylinder according to this invention is characterized in that a smooth hard chromium plated layer is formed on a combustion chamber top inner surface of the cylinder.
U.S. Pat. No. 5,361,730 issued on Nov. 8, 1994 to Richard J. Clark et al and subsequently assigned to Clark Industries, Inc. discloses a unitary cylinder head and liner combination is vertically cast as a one piece unit. The liner incorporates a water jacket therein. The water jacket is draftless, allowing water to circulate therethrough more efficiently, increasing cooling capabilities. Such vertical one piece casting is made possible by a novel two piece core which eliminates the need for welding of metal bands onto an outer surface of the liner to produce the water jacket thereof. A novel method of vertical casting is also provided which allows the cylinder head to be cast internal with the liner, allows for increased water capacity in the liner and integral head passages, and allows for a plurality of enlarged air intake channels to be provided.
U.S. Pat. No. 5,586,522 issued on Dec. 24, 1996 to Lawrence R. Phillis et al discloses a cylinder head for an internal combustion engine which includes a replaceable combustion chamber dome and an engine cylinder head housing which receives and supports the combustion chamber dome therein. The dome includes a spark plug housing that fits within an aperture within the engine cylinder head housing in such a way that rotational movement of the dome relative to the housing is prevented. The engine cylinder head housing includes a fluid coolant inlet port, a dome cooling chamber in fluid communication with the inlet port and which surrounds an outer periphery of the dome, and an exhaust port in fluid communication with the dome cooling chamber whereby coolant is directed to a cylinder block for the engine. The housing further includes a cylinder head housing cooling chamber in fluid communication with coolant within the cylinder block, and an outlet port in fluid communication with the cylinder head housing cooling chamber.
As can be clearly distinguished from the instant invention the '522 patent cannot be practiced absent specifically tooled surfaces which allow for a complimenting locking mechanism to prevent rotational movement of the '522's replaceable dome (See column 2, lines 30-44).
U.S. Pat. No. 5,657,729 issued on Aug. 19, 1997 to Steven Atmur et al and subsequently assigned to Northrop Grumman Corporation discloses a ceramic cylinder head or cylinder head liner for an internal combustion engine. The cylinder head is made of a fiber reinforced ceramic matrix composite material and includes a heat sink on the top surface to keep touch temperatures at a reasonable level. The preferred embodiment employs water cooling so as to reduce engine compartment temperatures and provide a supply of hot water for passenger compartment heating.
This invention relates generally to internal combustion engines of the two cycle design. More specif

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