Patent US4586465A successfully refreshed from Google Patents.
US4586465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: Individual
•
Filing: 1985-01-09
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Granted: 1986-05-06
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Expires: 2005-01-09
Abstract
Abstract An internal combustion engine has a cylinder with a porting ring adjacent the cylinder head to reduce the diameter of the cylinder. The piston in the cylinder has a reduced diameter crown portion complementary to the porting ring and an upper face on the crown provided with a small clearance from the cylinder head to provide a large squish area. A primary combustion chamber of "dogbone" shape is provided in the crown, while a secondary combustion chamber is provided under the crown. On the power stroke, the sparking plug ignites the air/fuel mixture in the primary combustion chamber and the pressure pulse generated pushes the piston down the cylinder. When the piston crown clears the porting ring, the air/fuel mixture in the secondary combustion chamber is ignited and a second pressure pulse is applied to the piston. The slower, staged, burning of the air/fuel mixture in the cylinder applies a more powerful driving force to the piston, generating increased torque.
Inventors
- 👤 Michael R. Krogdahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:10
CPC Classifications
F; F02; F02B; F02B19/00; F02B19/02; F02B19/04; F02B23/00; F02B23/08; F02F; F02F3/00; F02F3/28; F02F1/00; F02F1/24; F02F2001/244; F02F2001/245; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
263 words
An internal combustion engine of the type including: an engine block having at least one cylinder, said cylinder having an upper portion and an upper crown portion; a piston in the cylinder operatively connected to a crankshaft; and a cylinder head, having at least one sparking plug, closing the cylinder, and a face; wherein the improvement resides in: the upper portion of the cylinder having a reduced diameter; the piston having an upper crown portion complementary to the upper portion of the cylinder and a face on said upper crown portion of said piston being complementary to the face of the cylinder head; a primary combustion chamber formed above the upper crown portion of the piston; and a secondary combustion chamber formed within the piston below the face of the piston and within the upper crown portion of the piston being substantially enclosed therein; the secondary combustion chamber being annular in plan with a peripheral port under the upper crown portion of the piston interconnecting said chamber to the cylinder; so arranged that: during operation said piston cycles through an intake stroke, a compression stroke, a power stroke and an exhaust stroke; and during the power stroke, an air/fuel mixture is compressed in both the primary and secondary combustion chambers; and at and near top dead centre of the power stroke, said primary and secondary chambers are isolated from each other, and the sparking plug ignites the air/fuel mixture in the primary chamber and, as the piston descends in the cylinder said burning air/fuel mixture ignites the air/fuel mixture in the secondary chamber.
Claim 2
Dependent Claim
263 words
An internal combustion engine of the type including: an engine block having at least one cylinder, said cylinder having an upper portion and an upper crown portion; a piston in the cylinder operatively connected to a crankshaft; and a cylinder head, having at least one sparking plug, closing the cylinder, and a face; wherein the improvement resides in: the upper portion of the cylinder having a reduced diameter; the piston having an upper crown portion complementary to the upper portion of the cylinder and a face on said upper crown portion of said piston being complementary to the face of the cylinder head; a primary combustion chamber formed above the upper crown portion of the piston; and a secondary combustion chamber formed within the piston below the face of the piston and within the upper crown portion of the piston being substantially enclosed therein; the secondary combustion chamber being annular in plan with a peripheral port under the upper crown portion of the piston interconnecting said chamber to the cylinder; so arranged that: during operation said piston cycles through an intake stroke, a compression stroke, a power stroke and an exhaust stroke; and during the power stroke, an air/fuel mixture is compressed in both the primary and secondary combustion chambers; and at and near top dead centre of the power stroke, said primary and secondary chambers are isolated from each other, and the sparking plug ignites the air/fuel mixture in the primary chamber and, as the piston descends in the cylinder said burning air/fuel mixture ignites the air/fuel mixture in the secondary chamber.
Claim 3
Dependent Claim
33 words
An engine as claimed in claim 1 wherein: two pressure pulses are applied to the piston on each power stroke as the air/fuel mixtures in the primary and secondary combustion chambers are ignited.
Claim 4
Dependent Claim
57 words
An engine as claimed in claim 1 wherein: the reduced diameter upper portion of the cylinder is formed by a porting ring fitted in the cylinder adjacent the cylinder head and having a plain cylindrical bore; and the upper crown portion of the piston is substantially cylindrical with a small running clearance relative to the porting ring.
Claim 5
Dependent Claim
31 words
An engine as claimed in claim 3 wherein: the porting ring separates the primary combustion chamber from the secondary combustion chamber when the piston is at and near top dead centre.
Claim 6
Dependent Claim
71 words
An engine as claimed in claim 3, including the intake valve, an exhaust valve, and the incoming air/fuel mixture, wherein: at the beginning of the intake stroke, the intake valve is opened, the exhaust valve is closed and the piston descends, the descent of the piston in the cylinder causing a rapid acceleration of the air/fuel mixture coming into the cylinder to fill the primary and secondary chambers of the cylinder.
Claim 7
Dependent Claim
35 words
An engine as claimed in claim 5 wherein: at the end of the compression stoke, said air/fuel mixtures are compressed in the primary and secondary combustion chambers and said chambers are isolated from each other.
Claim 8
Dependent Claim
65 words
An engine as claimed in claim 6 wherein: the sparking plug ignites the air/fuel mixture in the primary combustion chamber at and before top dead centre of the power stroke, the burning air/fuel mixture in the primary combustion chamber being propogated through the cylinder and igniting the air/fuel mixture in the secondary combustion chamber when the crown portion of the piston clears the porting ring.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |