Endless belt power transmission systems or components – Pulley having circumferentially spaced portions of drive...
Patent
1988-09-08
1989-09-12
Bui, Thuy M.
Endless belt power transmission systems or components
Pulley having circumferentially spaced portions of drive...
29159R, 745942, 280259, F16H 5530
Patent
active
048655775
ABSTRACT:
Noncircular drives, including chain drives with noncircular sprockets, achieve a desired functional relationship and minimize slack variation in the elongate flexible member thereof. Noncircular gears having the desired functional relationship are first designed. Noncircular members having the same pitch curve or operative surface configuration as the pitch curves of the noncircular gears are theoretically located at the desired center-to-center distance of the noncircular rotational members of the drive being designed. The noncircular members are manipulated such that points initially in contact on the gears are not joined by a common tangent. Using a computer, the drive is incremented with the common tangent acting as the driving span of the flexible member. At each increment functional relationship error and overall length of a taut elongate flexible member are calculated. The variation in taut flexible member length is the slack variation. In the event of excess functional relationship error, the design procedure is iterated modifying the functional relationship on which the original gear pair was based by adding the functional relationship error. This iterative procedure is continued until functional relationship is acceptable. If the slack variation is excessive, the same procedure continues with the other span, i.e., common tangent, driving until again the functional relationship is acceptable. If slack variation is still unacceptable, the design procedure continues using first the one run of the flexible member and then the other until both functional relationship and slack variation is acceptable.
REFERENCES:
patent: 431529 (1890-07-01), Redlinger
patent: 513589 (1894-01-01), Metz
patent: 515449 (1894-02-01), Scovell
patent: 528145 (1894-10-01), Carr
patent: 530058 (1894-11-01), Schaum et al.
patent: 599211 (1898-02-01), Williams
patent: 611170 (1898-09-01), Howard
patent: 613756 (1898-11-01), Buddle
patent: 885982 (1908-04-01), Delacroix
patent: 1906801 (1933-05-01), Mather
patent: 1963314 (1934-06-01), Savell et al.
patent: 2277458 (1942-03-01), Schultze
patent: 2693119 (1954-11-01), Payberg et al.
patent: 2711221 (1955-06-01), Kopczynski
patent: 2994216 (1961-08-01), Morton
patent: 3259398 (1966-07-01), Hattan
patent: 4181034 (1980-01-01), Daniel
patent: 4522610 (1985-06-01), Nagano
Anonymous, Elliptical Sprocket Boosts Biker's Mileage, Machine Design 46, Feb. 7, 1974, p. 43.
Whitt, F. R. and Wilson, D. G., Bicycling Science and Ergonomics and Mechanics, 2d 3d., M.I.T. Press, Cambridge, MA, 1982, pp. 288-290.
Shimano Industrial Co., Ltd., The New Shape for Pedaling Efficiency, undated product literature in product packaging.
Miller, N. R. and Ross, D., The Design of Variable-Ratio Chain Drives for Bicycles and Ergometers--Application to a Maximum Power Bicycle Drive, Trans. ASME 105, J. of Mechanical Design, 1980.
Sadler, J. P. and Krump, M. A., Synthesis of Band Mechanisms with Variable Velocity Ratios, ASME Paper 84-DET-51, 1984.
Bloomfield, B., When you Need Noncircular Gears, Product Engineering, Mar. 14, 1960.
Bui Thuy M.
Trustees of Columbia University in the City of New York
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