Variable speed drive with no slippage between belt and sheaves

Details Variable speed drive with no slippage between belt and sheaves Variable speed drive with no slippage between belt and sheaves

1981-04-20

1984-02-07

Staab, Lawrence J.

Endless belt power transmission systems or components

Friction drive belt

Including plural interconnected members each having a drive...

474265, F16G 5180, F16G 5116

Patent

active

044300670

ABSTRACT:
V-belts and conical sheaves have long been used in variable ratio friction drive systems. In higher power applications the belts are replaced by metal chains carrying pins which lock to the sheaves. The latter systems are generally 90% efficient. The main loss is associated with the engagement and disengagement of the pins with the sheaves. Each pin slides radially along the sheave as it wedges into place. The loss is considerable because contact is along a line from which lubricant is extruded rather than over an area on which lubricant is present. To avoid this loss the present invention provides a shoe appended to the end of each pin. Coupling between shoe and pin is such that the shoe is permitted to slide relative to the pin in a direction radial to the sheave. It is prevented from sliding relative to the pin in a direction circumferential to the sheave. This arrangement causes the previous sliding along the unlubricated line contact between pin and sheave to be replaced by sliding along a well lubricated surface contact. This virtually eliminates the loss, virtually eliminates wear, and permits greater loads to be carried. Resultant system provides no slippage between pins and sheaves.

REFERENCES:
patent: 803810 (1905-11-01), Cutter
patent: 1194962 (1916-08-01), Crowe
patent: 2073846 (1937-03-01), Maurer
patent: 2406253 (1946-08-01), Reeves
patent: 2475264 (1949-07-01), Sutton
patent: 2690678 (1954-10-01), Bendall

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