US3686972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine variable throw crankshaft
Assignee: Individual
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Filing: 1970-05-28
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Granted: 1972-08-29
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Expires: 1990-05-28
Abstract
Abstract A crankshaft for an internal combustion engine comprising a plurality of crank throws whose crank radii are made to vary throughout the crankshaft revolution. The crankshaft and varying radii crank throws are interconnected by four gears which rotate an eccentric which is placed between the connecting rod and crankpin. Rotation of the eccentric may be clock-wise or counterclockwise depending on the arrangement of gears used to generate either epicycloidal or hypocycloidal motion in which the cuspated motion is attenuated by incorporating a pair of noncircular gears which also rotate the eccentric upon the crankpin in a manner which causes the piston to move in the cylinder to a precalculated position during the combustion independent of the uniform speed of the crankpin.
Inventors
- 👤 Edward M Mcwhorter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:39
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/32; F01; F01B; F01B9/00; F01B9/02; F16; F16C; F16C23/00; F16C23/10; F16C3/00; F16C3/04; F16C3/22; F16C3/28; F16H; F16H21/00; F16H21/10; F16H21/16; F16H21/18; F16H21/22; F16H21/30; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19555; Y10T74/21; Y10T74/2173; Y10T74/2181
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
273 words
In engines of the character described, a. An engine block, b. A plurality of equally spaced and axially aligned main journal bearings affixed to said engine block, c. a plurality of stationary gears centrally positioned over the axial center-line of said main journal bearings and being affixed to said engine block, d. a crankshaft rotatably mounted in said main journal bearings, e. said crankshaft having a plurality of shafts and a plurality of arms fixed at the (end) ends of said shafts, f. said arms being radially aligned in respective pairs and each said pair affixed in this position by a (common) piN, said pin being firmly affixed to each said arm, in a respective pair, g. an eccentric rotatably mounted on each said pin, h. a connecting rod rotatably mounted upon each said eccentric said connecting rod being connected to a piston at its opposite end, i. a non-circular gear attached to each said eccentric, j. each said non-circular gear being enmeshed with (its) a duplicate non-circular gear, k. each said duplicate non-circular gear being rotated by a fixedly attached connecting shaft rotatably mounted on an extension protruding from the edge of one of the said arms comprising each of the said pair of radially aligned arms, l. the opposite end of each said connecting shaft being fixedly attached to and rotated by a running gear enmeshed in one of said stationary (gear) gears, m. each said enmeshed running (gear) gears being caused to turn by the revolution of said crankshaft, n. said rotation causing each said eccentric to be rotated in the opposite clockwise direction as the rotation of said crankshaft.
Claim 2
Dependent Claim
273 words
In engines of the character described, a. An engine block, b. A plurality of equally spaced and axially aligned main journal bearings affixed to said engine block, c. a plurality of stationary gears centrally positioned over the axial center-line of said main journal bearings and being affixed to said engine block, d. a crankshaft rotatably mounted in said main journal bearings, e. said crankshaft having a plurality of shafts and a plurality of arms fixed at the (end) ends of said shafts, f. said arms being radially aligned in respective pairs and each said pair affixed in this position by a (common) piN, said pin being firmly affixed to each said arm, in a respective pair, g. an eccentric rotatably mounted on each said pin, h. a connecting rod rotatably mounted upon each said eccentric said connecting rod being connected to a piston at its opposite end, i. a non-circular gear attached to each said eccentric, j. each said non-circular gear being enmeshed with (its) a duplicate non-circular gear, k. each said duplicate non-circular gear being rotated by a fixedly attached connecting shaft rotatably mounted on an extension protruding from the edge of one of the said arms comprising each of the said pair of radially aligned arms, l. the opposite end of each said connecting shaft being fixedly attached to and rotated by a running gear enmeshed in one of said stationary (gear) gears, m. each said enmeshed running (gear) gears being caused to turn by the revolution of said crankshaft, n. said rotation causing each said eccentric to be rotated in the opposite clockwise direction as the rotation of said crankshaft.
Claim 3
Dependent Claim
312 words
In engines of the character described, a. an engine block, b. a plurality of equally spaced and axially aligned main journal bearings affixed to said engine block, c. a plurality of stationary internal tooth annular gears centrally positioned over the axial center line of said main journals and fixedly attached to said engine block at a point approximately one third the distance of the working span between said main journal bearings, d. a crankshaft rotatably mounted in said main journal bearings, e. said crankshaft having a plurality of shafts and a plurality of arms fixed at the (end) ends of said shafts, f. said arms being radially aligned in respective pairs and each said pair affixed in this position by a (common) pin, said pin being fixedly attached to each said arm in a respective pair, one arm of each said radially aligned pair of arms (contain) containing an instep to accommodate clearance of said stationary internal tooth annular gears, g. an eccentric rotatably mounted on each said pin, h. a connecting rod rotatably mounted upon each said eccentric, each said connecting rod being connected to a piston at its opposite end, i. a non-circular gear attached to each said eccentric, each said non-circular gear enmeshed with a duplicate non-circular gear, j. each said duplicate non-circular gear being rotated by a fixedly attached connecting shaft each said shaft being rotatably mounted on the said arm of each said radially aligned pair of arms containing said instep, k. the opposite end of each said connecting shaft being fixedly attached to and rotated by a running gear enmeshed in a respective said stationary internal tooth (gears) gear, l. each said enmeshed running gear being caused to turn by the revolution of said crankshaft, m. said revolution causing each said eccentric to be rotated in the same clockwise direction as the revolution of said crankshaft.
Claim 4
Dependent Claim
312 words
In engines of the character described, a. an engine block, b. a plurality of equally spaced and axially aligned main journal bearings affixed to said engine block, c. a plurality of stationary internal tooth annular gears centrally positioned over the axial center line of said main journals and fixedly attached to said engine block at a point approximately one third the distance of the working span between said main journal bearings, d. a crankshaft rotatably mounted in said main journal bearings, e. said crankshaft having a plurality of shafts and a plurality of arms fixed at the (end) ends of said shafts, f. said arms being radially aligned in respective pairs and each said pair affixed in this position by a (common) pin, said pin being fixedly attached to each said arm in a respective pair, one arm of each said radially aligned pair of arms (contain) containing an instep to accommodate clearance of said stationary internal tooth annular gears, g. an eccentric rotatably mounted on each said pin, h. a connecting rod rotatably mounted upon each said eccentric, each said connecting rod being connected to a piston at its opposite end, i. a non-circular gear attached to each said eccentric, each said non-circular gear enmeshed with a duplicate non-circular gear, j. each said duplicate non-circular gear being rotated by a fixedly attached connecting shaft each said shaft being rotatably mounted on the said arm of each said radially aligned pair of arms containing said instep, k. the opposite end of each said connecting shaft being fixedly attached to and rotated by a running gear enmeshed in a respective said stationary internal tooth (gears) gear, l. each said enmeshed running gear being caused to turn by the revolution of said crankshaft, m. said revolution causing each said eccentric to be rotated in the same clockwise direction as the revolution of said crankshaft.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |