Endless belt power transmission systems or components – Pulley with expansible rim means or pulleys with alternately... – Structure for variably adjusting radius of rim section
Patent
1987-05-19
1988-09-06
Novosad, Stephen J.
Endless belt power transmission systems or components
Pulley with expansible rim means or pulleys with alternately...
Structure for variably adjusting radius of rim section
474 53, F16H 5552
Patent
active
047689960
ABSTRACT:
A continuously variable transmission of the type employing a flat belt extending between driving and driven pulley assemblies, each having a circumferential array of radially adjustable belt engaging elements, is disclosed in conjunction with a self-energized control system for establishing the instantaneous radial position of the belt engaging elements. The radial positions of the belt engaging elements of each pulley assembly depend upon the angular relationship between inner and outer guideway disk structures carrying logarithmic spiral guideways oriented in the opposite sense, the resulting intersections of the spiral guideways supporting bearing regions at the ends of the belt engaging elements. Each pulley assembly includes a power consuming element, such as an oil pump, which is coupled through differential gearing, such as a harmonic drive, to the inner and outer guideway disks and to the power consuming element. When the load on the oil pump is changed by changing the output pressure against which it pumps, the angular relationship between the inner and outer guideway disk structures changes to correspondingly change the positions of the guideway intersections and hence the radial positions of the belt engaging elements. Since the belt is of fixed length, the other pulley assembly must change its effective diameter in the opposite direction, and this response is facilitated by changing the output pressure of its oil pump in the opposite direction. Very fast ratio changes may be expedited by supplying oil to the appropriate one of the oil pumps in sufficient quantity to permit it to transiently motor.
REFERENCES:
patent: 672962 (1901-04-01), Seymour
patent: 4024772 (1977-05-01), Kumm
patent: 4295836 (1981-10-01), Kumm
patent: 4591351 (1986-05-01), Kumm
patent: 4714452 (1987-12-01), Kumm et al.
Bui Thuy M.
Kumm Industries, Inc.
Novosad Stephen J.
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