# US 4,391,232 A · Internal-combustion engine with opposed pistons

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- Number: US 4,391,232 A
- Document ID: US4391232A
- Status: Granted
- Kind: A
- Application number: 06/247,317
- Filed: 1981-03-25
- Granted: 1983-07-05
- Earliest claimed: 1980-03-27
- Inventors: Marcel J. Geirnaert
- Web page: https://patentgrep.com/patent/US4391232A

## CPC

- F02B 75/26: Engines with cylinder axes coaxial with, or parallel or inclined to, main-shaft axis; Engines with cylinder axes arranged substantially tangentially to a circle centred on main-shaft axis
- F02B 25/08: Engines with oppositely-moving reciprocating working pistons
- F02B 75/28: Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders (arranged oppositely relative to main shaft F02B75/24)
- F02M 25/06: adding lubricant vapours
- F02B 2075/025: {two}
- Y02T 10/12: Improving ICE efficiencies
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Each cylinder is surrounded by four annular channels. The first three annular channels are in communication with the interior volume of the cylinder through a plurality of spaced apart openings and with a transfer channel connecting the opposite ends of the interior volume of the cylinder. The fourth annular channel is in communication with the interior volume of the cylinder through a plurality of spaced apart openings and with the exhaust pipe. The transfer channel has its wall formed with a plurality of spaced apart apertures therethrough, these apertures being distributed lengthwise of the transfer channel, such that they put the transfer channel in communication with the intake pipe, the apertures being provided each with a one-way low-inertial inlet device for allowing a high rate air flow to be aspirated into the cylinder with substantially no flow back towards the intake pipe.

## Claims

### Claim 1

An internal-combustion engine comprising a housing including at least one cylinder unit comprising a cylinder bore with two opposed pistons each having two working faces slidably mounted therein and with fuel admission means, first, second, third and fourth annular channels extending around and adjacent the wall of the cylinder bore over a portion of the length thereof, each of said annular channels being in communication with the interior volume of the cylinder bore through spaced apart openings, the first and fourth annular channels being located at one end of the cylinder bore and the second and third annular channels being located at the opposite end of the cylinder bore; transfer channel means having a length extending lengthwise of the cylinder bore and extending around and adjacent a portion of the wall of the cylinder bore, said transfer channel means being in direct communication with said first second and third annular channels; air intake pipe means extending lengthwise adjacent and along the length of said transfer channel means, a common partition between the air intake pipe means and the transfer channel means along the length of said transfer channel means, said common partition having a plurality of spaced apart apertures therethrough distributed lengthwise of the transfer channel means, said apertures having one-way low-inertia gate means allowing a high rate of air flow from the air intake pipe means through the transfer channel into the cylinder bore and substantially no air flow back from the cylinder bore through the transfer channel means into the air intake pipe means; and an exhaust pipe connected to said fourth annular channel for discharge of the spent products of combustion.

### Claim 2 (depends on 1)

An internal-combustion engine according to claim 1, wherein each of said one-way low-inertia gate means comprises a flexible blade mounted so as to bend toward the interior of the transfer channel means when air is aspirated from the intake pipe means into the cylinder bore and to keep said apertures closed when air is circulating along the transfer channel means from one end of the cylinder bore to the other end thereof.

### Claim 3 (depends on 1)

An internal-combustion engine according to claim 1, wherein the air intake pipe means includes turbine means associated with an oil distributor, said turbine means being driven by the air aspirated through the air intake pipe means, said turbine means further operating as an inertial blowing means when no air is aspirated into the system.