Abstract A two-part variable compression ratio piston provided with an upper and lower chamber, supply valve means connected with the lubrication system of the engine for supplying oil to the chambers in a manner which permits the parts, by inertia forces and the forces generated by combustion chamber pressures, to move relative to each other at a controlled rate to increase the compression ratio of the engine until a predetermined constant maximum combustion chamber pressure has been achieved, a discharge valve assembly for discharging some of the oil from the upper chamber to the engine crankcase when the pressure in the upper chamber exceeds a predetermined maximum value and a restricted discharge orifice connected to the lower chamber for discharging a controlled quantity of oil therefrom. The supply valve and discharge valve assembly are each preferably formed with a conically shaped exterior surface that mates with a similarly shaped hole within the inner piston member for retaining the valves therein. The supply valve is formed with a separate seat spool which is inserted into a bore formed through the supply valve body and welded in place.
Inventors
👤 Val Cronstedt
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-04 03:55
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/04; F02B75/044
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
276 words
In a variable compression ratio piston for an internal combustion engine having an inner member and an outer member movable relative to one another to vary the compression ratio of the engine, means defining a first and second chamber, said chambers varying oppositely in volume with respect to relative movement of said members, means for discharging fluid from said second chamber at a controlled rate and means for discharging fluid from said first chamber upon a predetermined pressure being produced therein; means disposed with said inner member for supplying a pressure fluid to said chambers, said means including a supply valve carried by said inner member with opposite ends of said supply valve respectively connected to said chambers and valve plates disposed to automatically open and close Communication between said supply valve and said chambers, the improvement comprising: said supply valve consisting of an elongated conically shaped outer housing disposed within a bore formed in said inner member, said outer housing having a cylindrical, axial bore extending completely through said housing, a spool mounted in said axial bore in a position spaced from opposite ends thereof said spool having a cylindrical outer surface and an axial through bore, end surfaces of said spool intersecting said outer surface to form valve seats at each end of said through bore, a stop member mounted within said outer housing at each end of said axial bore and spaced from said valve seats and valve plates disposed within said axial bore intermediate said spool and said stop members to move between said valve seats and said stop members to open and close communication between said through bore and said chambers.
Claim 2
Dependent Claim
276 words
In a variable compression ratio piston for an internal combustion engine having an inner member and an outer member movable relative to one another to vary the compression ratio of the engine, means defining a first and second chamber, said chambers varying oppositely in volume with respect to relative movement of said members, means for discharging fluid from said second chamber at a controlled rate and means for discharging fluid from said first chamber upon a predetermined pressure being produced therein; means disposed with said inner member for supplying a pressure fluid to said chambers, said means including a supply valve carried by said inner member with opposite ends of said supply valve respectively connected to said chambers and valve plates disposed to automatically open and close Communication between said supply valve and said chambers, the improvement comprising: said supply valve consisting of an elongated conically shaped outer housing disposed within a bore formed in said inner member, said outer housing having a cylindrical, axial bore extending completely through said housing, a spool mounted in said axial bore in a position spaced from opposite ends thereof said spool having a cylindrical outer surface and an axial through bore, end surfaces of said spool intersecting said outer surface to form valve seats at each end of said through bore, a stop member mounted within said outer housing at each end of said axial bore and spaced from said valve seats and valve plates disposed within said axial bore intermediate said spool and said stop members to move between said valve seats and said stop members to open and close communication between said through bore and said chambers.