Multiple piston expansion chamber engine

Patent · Tue Apr 08 04:00:00 EST 1986

OSTI ID:5745640

Jackson, F W

This patent describes a multiple piston expansion chamber in an internal combustion engine wherein combustion, expansion and exhaust functions are performed in a cylinder. This cylinder consists of an auxiliary piston reciprocating in the cylinder, a sleeve valve reciprocating within the auxiliary piston, a working piston reciprocating within the sleeve valve. Leading the auxiliary piston is an auxiliary chamber above the auxiliary piston and a combustion chamber above the working piston. The sleeve valve controls communication of the auxiliary chamber with the combustion chamber to prevent communication of combusted products from the chamber above the working piston to the chamber above the auxiliary piston from when the working piston is at about TDC until a subsequent expansion stroke of the working piston is underway to a point about midway to BDC. When the auxiliary piston is at about TDC at this same instant when the working piston is at the point and the communication then is commenced. In order to permit communication only during the expansion stroke from continuing past the point 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. The controlling means comprises a circular sealing surface on an upward viewing surface of the sleeve valve adjacent to the working piston to prevent communication of the respective chambers. Also provided in the chambers is a dwell of the sleeve valve at its TDC between when the respective pistons each reach their TDC.

• Assignee: NOV; EDB-86-101889
• Patent Number(s): US 4580532
• OSTI ID: 5745640
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
COMBUSTION CHAMBERS
CONTROL EQUIPMENT
CYLINDERS
DESIGN
ENGINES
EQUIPMENT
EXPANSION
FLOW REGULATORS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
PISTONS
SEALS
VALVES