Planetary gear transmission systems or components – Nonplanetary variable speed or direction transmission... – Nonplanetary transmission is belt or chain gearing
Patent
1991-07-05
1993-07-27
Braun, Leslie A.
Planetary gear transmission systems or components
Nonplanetary variable speed or direction transmission...
Nonplanetary transmission is belt or chain gearing
475208, 475211, F16H 3706
Patent
active
052306690
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates generally to power transmissions, and more particularly to continuously variable power transmissions.
BACKGROUND ART
It is known to provide a continuously variable transmission in which the rotation of an output shaft is dependent upon the difference between the speeds of rotation of an input shaft and an alternate shaft. Andrus, U.S. Pat. No. 2,745,297 discloses a reversible speed changer with a drive shaft and a counter shaft. The drive shaft is connected to a sun gear and the counter shaft is connected to a ring gear. A planetary gear system is connected between the ring gear and the sun gear. An output shaft is operatively connected to the planetary gears such that rotation of the planetary gears will result in rotation of the output shaft. The speed of rotation of the output shaft is dependent upon the difference between the linear speeds of rotation of the sun gear and the ring gear. This difference in speeds of rotation can be controlled by a variable power take-off which variably couples the counter shaft to the input shaft. The transmission disclosed by Andrus produces relatively show speeds and relatively low torque.
Gillade, U.S. Pat. No. 4,406,178, discloses a power transmission in which an input shaft is connected to a sun gear. The input shaft is coupled to a driven shaft which is variably coupled to a disk on which planetary gears are mounted. The planetary gears mesh with the sun gear and with an output gear which is connected to an output shaft. Rotation of the output shaft is dependent upon the difference in linear speeds of rotation of the disk and the sun gear.
DISCLOSURE OF INVENTION
It is an object of the invention to provide a stepless transmission which will change from the neutral position to full speed and power without interruption.
It is another object of the present invention to provide a stepless transmission which will reverse the output direction without the necessity of disconnecting the output temporarily from the power.
It is yet another object of the present invention to provide a stepless transmission with high speed at the output.
It is another object of the invention to provide a stepless transmission with high torque at the output.
It is still another object of the invention to provide a stepless transmission with an output control.
It is another object of the invention to provide a stepless transmission with a brake system.
It is yet another object of the invention to provide a stepless transmission wherein variator means between an input shaft and variator shaft regulates both output speed and direction by restraining variator shaft rotation with variator shaft rotation being driven by a planetary gear system.
Continuously variable transmissions operate by transferring rotational power from an input shaft to an output shaft. The rotational speed that is transferred to the output shaft is variable owing to a speed varying system, presently referred to as the variator system. The variator system may comprise a variable diameter pulley on each of the input shaft and a variator shaft, so called because its rate of rotation is controlled by the input shaft through the variator system. The variator system can comprise variable width pulleys on each of the input shaft and the variator shaft, and a pulley belt connected therebetween. The inside surface of each face of the variable-width pulleys is typically beveled outward toward the center of each face, such that movement of opposing faces toward one another will increase the effective diameter of the pulley, and movement of the faces away from one another will decrease the effective diameter. The speed of rotation that is transferred from the input shaft to the variator shaft can be controlled by varying the effective diameter of one or both of the pulleys.
First gear means operatively connected to the input shaft meshes with third gear means operatively connected to an output shaft. Second gear means operatively connected to the variator shaft also meshes with the third gear
REFERENCES:
patent: 2745297 (1956-05-01), Andrus
patent: 2889716 (1959-06-01), Doty
patent: 3128636 (1964-04-01), Graybill
patent: 3257867 (1966-06-01), Pennick
patent: 3479908 (1969-11-01), Kress et al.
patent: 3538789 (1970-11-01), Quick et al.
patent: 3552232 (1971-01-01), Kress
patent: 4290320 (1981-09-01), Abbott
patent: 4406178 (1983-09-01), Gillade
patent: 4589303 (1986-05-01), Roberts
patent: 4644820 (1987-02-01), Macey et al.
patent: 4644821 (1987-02-01), Sumiyoshi et al.
patent: 4729261 (1988-03-01), Tervola
patent: 4913003 (1990-04-01), Tervola
patent: 5073157 (1991-12-01), Herscovici
patent: 5112283 (1992-05-01), Miyata et al.
Blum Alvin S.
Braun Leslie A.
Ta Khoi Q.
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