US4359017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: Individual
•
Filing: 1981-06-12
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Granted: 1982-11-16
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Expires: 2001-06-12
Abstract
Abstract An internal combustion engine operating on a two-stroke cycle and including a piston 1 reciprocable in a cylinder 2 to drive a crank shaft and also to inhale and compress a volume of air is characterized by a second piston 15 working in a separate cylinder 13 co-axial with and opposed to the first cylinder 2, the piston 15 being synchronized with the first piston 1. The second piston 15 acts to introduce a compressed charge of mixture of air and fuel through a non-return valve 30 into a relatively small ignition chamber 34 including a sparking plug 35 and communicating with a combustion chamber 11 in the head of the cylinder 1. The piston 15 draws air/fuel mixture along an inlet passage 20, past a non-return reed valve 21 and into a crank case 22. On the return stroke of the piston 15 the mixture passes through passages 23 in the piston controlled by a non-return valve 24 and also along passages 14 and around the piston. The next stroke of the piston 15 compresses the charge of mixture and forces it through the valve 30 which generates turbulence prior to ignition.
Inventors
- 👤 Claude H. May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:15
CPC Classifications
F; F02; F02B; F02B33/00; F02B33/02; F02B33/06; F02B33/08; F02B19/00; F02B19/12; F02M; F02M71/00; F02M71/02; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
238 words
In an internal combustion engine operating on a two-stroke cycle and including a first piston reciprocable in a first cylinder to drive a crank shaft and also to inhale and compress a volume of air and a second piston working in a separate cylinder and synchronised with the first piston for drawing in a charge of mixture of air and fuel through an inlet valve, compressing the charge and forcing it through a non-return valve into a relatively small ignition chamber including a sparking plug and communicating with a combustion chamber in the cylinder head, the improvement wherein said separate cylinder is co-axial with and opposed to said first cylinder, said inlet valve is a reed valve located at the crank case end of said cylinder, and said second piston is formed with axial passages, said second piston including at least one non-return valve operating in such a way as to allow the passage of mixture through said second piston during part at least of the outward stroke, whereby on each inward stroke of said second piston a charge of mixture is compressed and forced through said non-return valve and a further charge is drawn into said separate cylinder through said reed valve from a carburettor and on each outward stroke the further charge is subjected to light compression and passes to the other side of said second piston in readiness for compression on the next inward stroke.
Claim 2
Dependent Claim
238 words
In an internal combustion engine operating on a two-stroke cycle and including a first piston reciprocable in a first cylinder to drive a crank shaft and also to inhale and compress a volume of air and a second piston working in a separate cylinder and synchronised with the first piston for drawing in a charge of mixture of air and fuel through an inlet valve, compressing the charge and forcing it through a non-return valve into a relatively small ignition chamber including a sparking plug and communicating with a combustion chamber in the cylinder head, the improvement wherein said separate cylinder is co-axial with and opposed to said first cylinder, said inlet valve is a reed valve located at the crank case end of said cylinder, and said second piston is formed with axial passages, said second piston including at least one non-return valve operating in such a way as to allow the passage of mixture through said second piston during part at least of the outward stroke, whereby on each inward stroke of said second piston a charge of mixture is compressed and forced through said non-return valve and a further charge is drawn into said separate cylinder through said reed valve from a carburettor and on each outward stroke the further charge is subjected to light compression and passes to the other side of said second piston in readiness for compression on the next inward stroke.
Claim 3
Dependent Claim
69 words
An internal combustion engine according to claim 1 in which said separate cylinder has a wall of which the outer end is formed with passages uncovered by said second piston towards the end of the outward stroke whereby after the closure of said non-return valve in said second piston, as a result of deceleration of said second piston, the mixture flows along said passage and round said second piston.
Claim 4
Dependent Claim
27 words
An internal combustion engine according to claim 1 or claim 2 in which said non-return valve leading to said ignition chamber is co-axial with said two cylinders.
Claim 5
Dependent Claim
52 words
An internal combustion engine according to claim 3, in which said non-return valve leading to said ignition chamber has structure such as to produce a number of changes of direction of the mixture leading to localised turbulence tending to break up droplets of fuel and inhibit the formation of further such droplets.
Claim 6
Dependent Claim
77 words
An internal combustion engine according to claim 4 in which said non-return valve includes a seating surrounding a passage leading from the mixture supply space, a disc co-operating with said seating, said disc being located in a first space having slightly greater transverse extent than said disc and communicating with a further space on the side of said disc remote from said seating, said further space being in communication with a passage leading to said ignition chamber.
Claim 7
Dependent Claim
61 words
An internal combustion engine according to claim 5 wherein said first space has a basic diameter corresponding to the diameter of said disc, said first space being shaped to provide a plurality of spaced arcuate extensions beyond said basic diameter, said arcuate extensions being separated by cusp-shaped projections which support said disc to define said further space remote from said seating.
Claim 8
Dependent Claim
42 words
An internal combustion engine according to claim 5 in which said first cylinder has a cylinder head formed with a passage extending through said cylinder head from said non-return valve and said ignition chamber is formed as an enlargement in said passage.
Claim 9
Dependent Claim
23 words
An internal combustion engine according to claim 1, in which there is a single passage between said ignition chamber and said combustion chamber.
Claim 10
Dependent Claim
31 words
An internal combustion engine according to claim 1 in which said two cylinders have a common cylinder head, said common head being hollowed out to form a generally toroidal combustion chamber.
Claim 11
Dependent Claim
37 words
An internal combustion engine according to claim 1 in which said first cylinder includes at least one small additional outwardly opening valve-controlled exhaust port in the region of the midpoint of the length of said first cylinder.
Claim 12
Dependent Claim
39 words
An internal combustion engine according to claim 1 in which said two cylinders have a common bore whereby one cylinder forms an extension of the other and a block located between said two cylinders defines a common cylinder head.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |