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
1987-12-14
1989-03-07
Bui, Thuy M.
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, 474 56, F16H 1102, F16H 5552
Patent
active
048102342
ABSTRACT:
A continuously variable transmission 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 control system. 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. Each pulley assembly includes a power consuming or producing element, such as an oil pump/motor, which is coupled through harmonic drive differential gearing to the guideway disks. When the load on the hydraulic unit operated as a 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. 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. An alternate configuration and control is disclosed for use when large pulley actuator torques are present due to the centrifugal forces acting upon heavier, stronger belt engaging elements selected for heavier duty applications.
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.
Cates Charles E.
Kumm Industries, Inc.
Phillips James H.
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