Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1996-09-26
1998-04-28
Cummings, Scott
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
F16J 906
Patent
active
057435359
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to efficient sealing in automobile engines and particularly to sealing of engine cylinders in internal combustion engines to prevent loss of oil and to improve compression ratio.
BACKGROUND OF THE INVENTION
Pistons in internal combustion engines usually include three sealing rings around their periphery which engage with the cylindrical inner surface of an engine cylinder. These three sealing rings each are designed to perform a specific function. An uppermost of the seals provides a compression ring which is designed to seal during an upstroke of a piston to provide compression of the combustion gasses within the cylinder. The middle of the three rings is designed as an oil scraping ring to prevent oil from being carried up into the piston chamber and being burnt. A third ring is actually an oil spreader ring or oil control ring to provide an even film of lubricant on the piston wall. Some engines, particularly large engines, may have two or three compression rings per piston.
As wear in an engine occurs, however, these various rings do not carry out their function efficiently and an engine can burn more oil and have insufficient compression to provide inefficient and incomplete combustion of fuels. This can result in a build up of carbon deposit in the various rings and grooves which prevent the proper action of the piston rings with subsequent problems to efficiency of the engine and the burning of engine oil.
The compression ring in particular carries out a most important function but as wear occurs the ring can twist in its ring groove on both the up and down strokes of a piston and can tend to score the cylinder wall and also cause wear in the ring groove. This in turn causes further problems with sealing of the compression ring.
OBJECTS OF THE INVENTION
It is the object of this invention to provide an arrangement and a method to improve the efficiency of sealing and action of the compression ring of an internal combustion engine.
An alternative object is to provide the public with at least a useful alternative piston ring system.
SUMMARY OF THE INVENTION
In one form therefore although this may not necessarily be the only of broadest form the invention is said to reside in a piston including a compression ring groove, a compression ring in the compression ring groove and a sealing means in the compression ring groove behind the compression ring.
Preferably the sealing means is a seal ring of an elastomeric material. The seal ring of elastomeric material may be an O ring which has a cross-section shape selected from U-shaped, circular, oval, square, rectangular or trapezoidal and maybe hollow or solid.
Preferably the seal ring of elastomeric material is made from a heat resistant and oil resistant elastomeric material. Such a material may be a blend of neoprene and silicone rubbers.
In an alternative form the invention may be said to reside in a method of improving the compression ratio of an internal combustion engine including the step of removing the piston ring from the uppermost ring slot of each piston of the engine, inserting an O-ring into the uppermost piston ring slot and replacing the piston ring.
In a further form the invention may be said to reside in a sealing means to effect an improved seal of a compression ring of a piston of an internal combustion engine comprising an elastomeric material seal ring adapted to be fitted into a compression ring groove of the piston to engage with the rear or inner surface of the compression ring and an innermost peripheral surface of the compression ring groove.
Preferably the seal ring also engages a lower side surface of the compression ring groove.
It will be seen that by the various forms of the invention there is provided a seal ring behind the compression ring which is comprised of an elastomeric material such that a steady and even force is provided onto the rear of the compression ring to hold it evenly against the wall of the cylinder during the up and downstroke thereby preventing uneven wear a
REFERENCES:
patent: 2940803 (1960-06-01), Phillips
patent: 3525530 (1970-08-01), Bauer et al.
patent: 3727927 (1973-04-01), Packard
patent: 3751047 (1973-08-01), McGee
patent: 3851889 (1974-12-01), Nisper
patent: 3862480 (1975-01-01), Packard et al.
patent: 3919448 (1975-11-01), Dufresne
patent: 4569868 (1986-02-01), De Blauwe et al.
patent: 5197746 (1993-03-01), Rehfeld
Auto-Motive Improvements Pty Ltd.
Cummings Scott
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