Patent US4459945A successfully refreshed from Google Patents.
US4459945A
Expired / Lapsed
US
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Cam controlled reciprocating piston device
Assignee: Optimum Power Technology LP
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Filing: 1981-12-07
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Granted: 1984-07-17
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Expires: 2001-12-07
Abstract
Abstract A unique reciprocating piston device that uses one or more special cams and yokes to replace the functions normally provided by crankpins and connecting rods. The cams have noncircular finite jerk lift surfaces which provide continuous positive positioning of the yokes and pistons. Various cams can be configured to overcome the performance limitations imposed by crank and rod controlled pistons for a wide variety of engines and pumps. Preferred embodiments of this invention create a flexible, reliable, efficient and smooth running device for compressing, expanding and transferring fluids. In one specific application, an internal combustion engine is designed such that its pistons spend a greater portion of time near the top and bottom of each stroke than is possible with a crankshaft type engine.
Inventors
- 👤 Glen F. Chatfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:41
CPC Classifications
F; F01; F01B; F01B9/00; F01B9/02; F01B9/026; F01B9/023; F16; F16H; F16H25/00; F16H25/08; F16H25/14; F01B9/04; F01B9/06; F01B2009/061; F01B2009/063; F02; F02B; F02B1/00; F02B1/02; F02B1/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B75/16; F02B75/18; F02B75/24; F02B75/246; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18296
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
125 words
In an internal combustion engine the improvement comprising at least one cylinder and integral cam case, a camshaft, camshaft bearings for journaling the shaft in the cam case, a reciprocating piston in said at least one cylinder, a yoke comprising two cam follower surfaces, and a rod joining said piston and yoke a cam means comprising at least one noncircular, finite jerk cam mounted upon said camshaft and positioned within said yoke, said cam means configured such that it maintains positive control of the yoke at all times, such that said piston and yoke assembly makes precisely two strokes for each revolution of the camshaft and such that axial motion of the yoke near top and bottom dead center differs from just simple harmonic motion.
Claim 2
Dependent Claim
125 words
In an internal combustion engine the improvement comprising at least one cylinder and integral cam case, a camshaft, camshaft bearings for journaling the shaft in the cam case, a reciprocating piston in said at least one cylinder, a yoke comprising two cam follower surfaces, and a rod joining said piston and yoke a cam means comprising at least one noncircular, finite jerk cam mounted upon said camshaft and positioned within said yoke, said cam means configured such that it maintains positive control of the yoke at all times, such that said piston and yoke assembly makes precisely two strokes for each revolution of the camshaft and such that axial motion of the yoke near top and bottom dead center differs from just simple harmonic motion.
Claim 3
Dependent Claim
127 words
In an external combustion engine the improvement comprising at least one cylinder and integral cam case, a camshaft , camshaft bearings for journaling the shaft in the cam case, a reciprocating piston in said at least one cylinder, a yoke comprising two cam follower surfaces, and a rod joining said piston and yoke a cam means comprising at least one noncircular, finite jerk cam mounted upon said camshaft and positioned within said yoke, said cam means configured such that it maintains positive control of the yoke at all times, such that said piston and yoke assembly makes precisely two strokes for each revolution of the camshaft and such that axial motion of the yoke near the top and bottom dead center differs from just simple harmonic motion.
Claim 4
Dependent Claim
127 words
In an external combustion engine the improvement comprising at least one cylinder and integral cam case, a camshaft , camshaft bearings for journaling the shaft in the cam case, a reciprocating piston in said at least one cylinder, a yoke comprising two cam follower surfaces, and a rod joining said piston and yoke a cam means comprising at least one noncircular, finite jerk cam mounted upon said camshaft and positioned within said yoke, said cam means configured such that it maintains positive control of the yoke at all times, such that said piston and yoke assembly makes precisely two strokes for each revolution of the camshaft and such that axial motion of the yoke near the top and bottom dead center differs from just simple harmonic motion.
Claim 5
Dependent Claim
123 words
A reciprocating piston mechanism comprising at least one cylinder and integral cam case, a camshaft , camshaft bearings for journaling the shaft in the cam case, a reciprocating piston in said at least one cylinder, a yoke comprising two cam follower surfaces, and a rod joining said piston and yoke a cam means comprising at least one noncircular, finite jerk cam mounted upon said camshaft and positioned within said yoke, said cam means configured such that it maintains positive control of the yoke at all times, such that said piston and yoke assembly makes precisely two strokes for each revolution of the camshaft and such that axial motion of the yoke near top and bottom dead center differs from just simple harmonic motion.
Claim 6
Dependent Claim
123 words
A reciprocating piston mechanism comprising at least one cylinder and integral cam case, a camshaft , camshaft bearings for journaling the shaft in the cam case, a reciprocating piston in said at least one cylinder, a yoke comprising two cam follower surfaces, and a rod joining said piston and yoke a cam means comprising at least one noncircular, finite jerk cam mounted upon said camshaft and positioned within said yoke, said cam means configured such that it maintains positive control of the yoke at all times, such that said piston and yoke assembly makes precisely two strokes for each revolution of the camshaft and such that axial motion of the yoke near top and bottom dead center differs from just simple harmonic motion.
Claim 7
Dependent Claim
27 words
A reciprocating piston mechanism according to claim 3 comprising two opposed cylinders, one yoke and camshaft, two pistons and two rods connecting the pistons to said yoke.
Claim 8
Dependent Claim
41 words
A reciprocating piston mechanism according to claim 3 comprising two pairs of opposed cylinders arranged at right angles to each other and axially spaced along the camshaft, two yokes, four pistons and four connecting rods connecting piston pairs to each yoke.
Claim 9
Dependent Claim
16 words
A reciprocating piston mechanism according to claim 3 wherein the cam comprises a constant breadth cam.
Claim 10
Dependent Claim
21 words
A reciprocating piston mechanism according to claim 3 wherein a floating flat follower is located between the cam and the yoke.
Claim 11
Dependent Claim
33 words
A reciprocating piston mechanism according to claim 3 wherein the yoke includes at least one roller bearing cam follower that contacts the cam during only a portion of each revolution of the camshaft.
Claim 12
Dependent Claim
23 words
The improvement according to claim 3 wherein the piston dwells at TDC and BDC for between 0 and 60 degrees of camshaft rotation.
Claim 13
Dependent Claim
18 words
A reciprocating piston mechanism according to claim 3 comprising a plurality of cylinders, cams, pistons, yokes and rods.
Claim 14
Dependent Claim
43 words
A reciprocating piston mechanism according to claim 10 wherein the reciprocating mass of one piston yoke assembly is arranged to counterbalance the reciprocating mass of another piston yoke assembly and wherein the cams of said different yoke assemblies are at different angular orientations.
Claim 15
Dependent Claim
48 words
A reciprocating piston mechanism according to claims 3 or 10 further including a counterbalancing reciprocating mass for each yoke assembly controlled by a secondary cam disc on said camshaft, said secondary cam discs being similar to those engaging said primary yoke assemblies with a nonzero angular offset therefrom.
Claim 16
Dependent Claim
23 words
A reciprocating piston mechanism according to claims 3 or 10 wherein the cams have passages therein for slinging oil to the cam surfaces.
Claim 17
Dependent Claim
22 words
A reciprocating piston mechanism according to claim 3 comprising means for increasing the contact surface between the cam and cam follower surface.
Claim 18
Dependent Claim
22 words
A reciprocating piston device according to claim 14 wherein the means for increasing the contact surface comprises a flexible cam follower insert.
Claim 19
Dependent Claim
35 words
A reciprocating piston device according to claim 14 wherein the means for increasing contact surface comprises an arcuate surface in the cam follower surface at the location of contact when the piston is at TDC.
Claim 20
Dependent Claim
21 words
A reciprocating piston device according to claim 14 wherein the means for increasing surface contact comprise a compressible cam follower insert.
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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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |