Multiple piston expansion chamber engine

Patent · Tue Feb 18 04:00:00 EST 1986

OSTI ID:6024366

Jackson, F W

This patent describes an internal combustion engine. This engine consists of a cylinder with an auxiliary piston reciprocating in the cylinder; a working piston reciprocating within the auxiliary piston; an auxiliary chamber above the auxiliary piston; a combustion chamber above the working piston and providing a dwell for the auxiliary piston at TDC starting from when the working piston is between 40 degrees before to about TDC and on passing TDC entering an expansion stroke. The auxiliary piston remains at TDC until the working piston expansion stroke is underway and at a point where the working piston is between 20 and 160 degrees past TDC during the expansion stroke at which point the auxiliary piston leaves TDC and moves toward BDC. A controller communicating with the combustion chamber and the auxiliary chamber to prevent communication of combusted products from the combustion chamber above the working piston to the chamber above the auxiliary piston while the auxiliary piston is at TDC. The piston at TDC permits communication only during the working piston expansion stroke continuing past the point between 20 and 160 degrees past TDC, and a following exhaust stroke of the working piston so as to utilize energy of expansion from the auxiliary piston as it expands until the working piston has passed through BDC and returns to about TDC during the exhaust stroke of the working piston.

• Assignee: NOV; EDB-86-072826
• Patent Number(s): US 4570580
• OSTI ID: 6024366
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
COMBUSTION CHAMBERS
COMBUSTION PRODUCTS
CYLINDERS
DESIGN
ENGINES
EXHAUST GASES
EXPANSION
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
INCIDENCE ANGLE
INTERNAL COMBUSTION ENGINES
PISTONS
WASTES