Steering gear with varying transmission ratio

Details Steering gear with varying transmission ratio Steering gear with varying transmission ratio

1973-07-30

1977-03-15

Scott, Samuel

Machine element or mechanism

Control lever and linkage systems

Hand operated

74422, 74 32, 74 891S, B62D 120

Patent

active

040117642

ABSTRACT:
A nut on a helically threaded steering shaft, held against rotation, carries a first set of involute teeth meshing with a second set of involute teeth on an adjoining gear sector which pivots on an axis skew to that of the shaft. The two sets of teeth have centers of curvature offset from the sector axis but aligned with that axis in a midposition in which they engage each other without play; upon a shift of the nut to either side, the tooth clearance or backlash increases progressively while the transmission ratio either increases or decreases, depending upon the relative positions of the two centers of curvature and the sector axis. In a limiting case, the radius of curvature of one set of teeth is infinite.

REFERENCES:
patent: 903349 (1908-11-01), Barnes
patent: 1726621 (1929-09-01), Hart
patent: 2731277 (1956-01-01), Pearne
patent: 3161072 (1964-12-01), Le Tourneau
patent: 3250147 (1966-05-01), Barton et al.
patent: 3310990 (1967-03-01), Zettel
patent: 3710640 (1973-01-01), Stanger
patent: 3810395 (1974-05-01), Takahashi

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