Machine element or mechanism – Mechanical movements – Rotary to rotary
Patent
1991-05-24
1993-08-31
Herrmann, Allan D.
Machine element or mechanism
Mechanical movements
Rotary to rotary
74117, F16H 2114, F16H 2904
Patent
active
052398790
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
TECHNICAL FIELD
This invention relates to a simple stepless variable transmission.
There has been a long felt but unmet need for an efficient, durable and mechanically simple stepless variable transmission, as evidenced by the number of prior inventions related to the subject. Many machines, based on a variety of principles, have been proposed or built in an effort to achieve these goals, yet to date there has not been a truly successful simple stepless variable transmission.
BACKGROUND ART
U.S. Pat. No. 3,623,376 to Call discloses a stepless variable transmission comprising an input shaft, an output shaft, a plurality of modules and overrunning clutches which transforms the rotation of an input shaft into offset sinusoidal components which are selectively recombined by the overrunning clutches to achieve a constant speed output which can be varied.
U.S. Pat. No. 2,286,694 to Talbot discloses a variable speed drive having a module with an input shaft, an input stage arm, an input arm engagement member, an intermediate stage linkage, an output stage arm, an output engagement member and control means.
U.S. Pat. No. 1,257,479 to Grant discloses a transmission mechanical providing for multiple partial rotations of a tubular shaft and disks that can be moved from concentric to eccentric positions. The disks also have yokes, cams and racks.
U.S. Pat. No. 2,254,195 to Cicin discloses a stepless mechanical torque converter that converts rotations into turning motions, linear reciprocating movements, rotating oscillations and into uniform rotation.
U.S. Pat. No. 2,691,896 to Stageberg discloses a variable speed power transmission using a crank mechanism that includes a plurality of connecting rods and ratchet mechanisms.
U.S. Pat. No. 3,448,627 to Brooks discloses a gearless variable drive mechanism utilizing a rotating disk with an eccentric groove, a plurality of one way clutches and circumferentially spaced members engaging each of the clutches and the eccentric groove, each of the clutches having cam surfaces.
U.S. Pat. No. 3,881,362 to Beezer discloses a device for transmitting controlled movements in both an X axis and a Y axis direction including a rotatable shaft with separate drive cams for separately driving levers connected through slides to a first member which is guided for movement in an X direction and also connected through a cam drive and an adjustable slide to a second member which is mounted for movement along the Y axis.
U.S. Pat. No. 3,924,478 to Takasu discloses a speed reduction mechanism utilizing an eccentric with a driving disk mounted freely for rotation on the eccentric.
U.S. Pat. No. 4,112,778 to Korosue discloses a variable speed power transmission provided with rotary units that are mounted on an input axis and an output axis and parallel with each other with a phase angle difference between the rotary units, each of the rotary units having eccentric cams and a clutch.
U.S. Pat. No. 4,411,172 to DeMarco discloses a variable speed reducing and torque transmitting mechanism including a pair of counter rotating low speed impellers being driven from a spider shaft rotating at relatively high speed.
U.S. Pat. No. 4,493,222 to Heine discloses a gearless speed and torque converter using an input member mounted on a rotatable input shaft that has an Archimedes spiral groove bearing surface with an adjacently exposed output member with a complementary Archimedes spiral groove bearing surface where the grooves have different pitches. The shafts are coaxially mounted and a plurality of balls are disposed between the respective spiral grooves.
U.S. Pat. No. 4,765,195 to Takami discloses a stepless transmission mechanism using intermeshing noncircular gears and multiple shafts.
Traction machines have shown some success in light duty applications but have failed in heavy duty service. Torque converters have been used in more demanding situations but with considerable loss of efficiency. Purely mechanical, modified motion mechanisms have suffered either from complexity of design o
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patent: 634327 (1899-10-01), Dieterich
patent: 1257479 (1918-02-01), Grant
patent: 2067513 (1937-01-01), Talbot
patent: 2178784 (1939-11-01), Ewart
patent: 2254195 (1941-08-01), Cicin
patent: 2286694 (1942-06-01), Talbot
patent: 2364393 (1944-12-01), Seeck
patent: 2547453 (1951-04-01), Egy
patent: 2691896 (1954-10-01), Stageberg
patent: 3448627 (1969-06-01), Brooks
patent: 3623376 (1971-11-01), Call
patent: 3805628 (1974-04-01), Hulin
patent: 3881362 (1975-05-01), Beezer
patent: 3924478 (1975-12-01), Takasu
patent: 4075896 (1978-02-01), Pessina et al.
patent: 4112778 (1978-09-01), Korosue
patent: 4411172 (1983-10-01), DeMarco
patent: 4493222 (1985-01-01), Heine
patent: 4765195 (1988-08-01), Takami
patent: 5113712 (1992-05-01), Economou
Herrmann Allan D.
Hsia Martin E.
Laub David W.
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