Patent US4170970A successfully refreshed from Google Patents.
US4170970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engines
Assignee: Individual
•
Filing: 1976-11-10
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Granted: 1979-10-16
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Expires: 1996-11-10
Abstract
Abstract A split four-cycle engine in which the cylinders are arranged in pairs. The intake and compression strokes take place in one cylinder. The power and exhaust strokes take place in the other cylinder. The cylinders are connected by a passageway which is controlled by valves. The valves permit gases which are compressed in one cylinder to be transferred to the second cylinder where they can be burned to produce power. The pistons in the two cylinders are connected to separate cranks. These cranks are connected by a set of differential gears in a manner which will cause any change in the angular position of the rotor of the gears to change the phase relation between the cranks. This will be converted into a change in the compression ratio of the engine in a manner which will be described in detail later. The engine will be coupled to the butterfly valve of a carburetor in a manner which will cause the compression ratio of the engine to change with any change in the pressure of the gases being drawn from the carburetor and completely compensate for such changes in pressure. For this reason, ignition will always occur when the gases are fully compressed. This should make the engine more efficient than a conventional engine and it should produce less pollution than a conventional engine.
Inventors
- 👤 John H. McCandless
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:11
CPC Classifications
F; F02; F02B; F02B41/00; F02B41/02; F02B41/06; F02B33/00; F02B33/02; F02B33/06; F02B33/22; F02B75/00; F02B75/02; F02D; F02D15/00; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
237 words
A split four cycle variable compression combustion engine comprising: cylinders which are arranged in pairs so that intake and compression strokes take place in one cylinder and power and exhaust strokes take place in a second cylinder with the pistons of the two cylinders connected to separate cranks; a system of differential gears which are controlled by an accelerator pedal and which connect the two cranks in a manner which will cause any motion of the accelerator pedal to change the phase relation between the cranks; a means of causing changes in the phase relation between the cranks to produce changes in the compression ratio of the engine; a passageway which connects the tops of the two cylinders and which is controlled by two valves which will permit gases to flow between the cylinders from the time when one piston nears the top of its stroke until the other piston nears the top of its stroke but which will prevent gases from flowing between the cylinders at all other times; linkages which include a cam and which connect to a rotor coming from the differential gears to the throttle valve of a carburetor in a manner which will cause any change in the pressure of the gases in an intake manifold to be compensated for by changes in the compression ratio of the engine thus keeping the pressures at the time of ignition constant at all loads.
Claim 2
Dependent Claim
237 words
A split four cycle variable compression combustion engine comprising: cylinders which are arranged in pairs so that intake and compression strokes take place in one cylinder and power and exhaust strokes take place in a second cylinder with the pistons of the two cylinders connected to separate cranks; a system of differential gears which are controlled by an accelerator pedal and which connect the two cranks in a manner which will cause any motion of the accelerator pedal to change the phase relation between the cranks; a means of causing changes in the phase relation between the cranks to produce changes in the compression ratio of the engine; a passageway which connects the tops of the two cylinders and which is controlled by two valves which will permit gases to flow between the cylinders from the time when one piston nears the top of its stroke until the other piston nears the top of its stroke but which will prevent gases from flowing between the cylinders at all other times; linkages which include a cam and which connect to a rotor coming from the differential gears to the throttle valve of a carburetor in a manner which will cause any change in the pressure of the gases in an intake manifold to be compensated for by changes in the compression ratio of the engine thus keeping the pressures at the time of ignition constant at all loads.
Claim 3
Dependent Claim
250 words
A split four cycle variable compression internal combustion engine comprising: cylinders which are arranged in pairs so that intake and compression strokes take place in one cylinder and power and exhaust strokes take place in a second cylinder with the pistons of the two cylinders connected to separate cranks; a pair of helical gears which are mounted on the separate cranks and which are connected by linkages to an accelerator pedal so that any motion of the accelerator pedal will cause the gears to move axially with respect to each other and thus produce a change in the phase relation between the cranks; a means of causing any change in the phase relation between the cranks to produce a change in the compression ratio of the engine; a passageway which connects the tops of the two cylinders and which is controlled by two valves which permit gases to flow between the two cylinders from the time when one piston reaches the top of its stroke until the other piston nears the top of its stroke but which prevent gases from flowing between the cylinders at all other times; and linkages which include a cam and which connect the accelerator pedal to the butterfly valve of a carburetor in a manner which will cause any changes in the pressure of gases in an intake manifold to be compensated for by changes in the compression ratio of the engine thus keeping the pressures at the time of ignition constant at all loads.
Claim 4
Dependent Claim
250 words
A split four cycle variable compression internal combustion engine comprising: cylinders which are arranged in pairs so that intake and compression strokes take place in one cylinder and power and exhaust strokes take place in a second cylinder with the pistons of the two cylinders connected to separate cranks; a pair of helical gears which are mounted on the separate cranks and which are connected by linkages to an accelerator pedal so that any motion of the accelerator pedal will cause the gears to move axially with respect to each other and thus produce a change in the phase relation between the cranks; a means of causing any change in the phase relation between the cranks to produce a change in the compression ratio of the engine; a passageway which connects the tops of the two cylinders and which is controlled by two valves which permit gases to flow between the two cylinders from the time when one piston reaches the top of its stroke until the other piston nears the top of its stroke but which prevent gases from flowing between the cylinders at all other times; and linkages which include a cam and which connect the accelerator pedal to the butterfly valve of a carburetor in a manner which will cause any changes in the pressure of gases in an intake manifold to be compensated for by changes in the compression ratio of the engine thus keeping the pressures at the time of ignition constant at all loads.
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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) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |