F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
74/194
F16H 3/08 (2006.01) F16H 3/091 (2006.01) F16H 37/04 (2006.01) F16H 63/18 (2006.01)
Patent
CA 1209376
a) Title Incrementally Variable Single Countershaft Transmission. b) Abstract of the Disclosure Incrementally Variable Transmissions with single countershaft structures, and series structures that combine two or more single countershaft structures are disclosed herein. A single countershaft structure consists of coaxially mounted input and and output shafts, with one gear element in each pair of a sequence of gear-pairs fixed to the countershaft, with the second gear element of the first two pairs free to rotate on the input shaft, and the remaining second gear elements free to rotate on the output shaft. The ratios of the 1st and 2nd pair are referenced from the input to the countershaft with the ratios of the remaining pairs referenced from the countershaft to the output shaft. The ratios of any single countershaft structure are selected by a mechanism, consisting of a shift gate with profiled slots that move the shift forks of sliding dog couplers between each gear-pair, so that either the 1st, or 2nd gear-pair is coupled to the input shaft, in combinations with the remaining gear-pairs that are coupled to the output shaft, begining with the last pair of the sequence. The order of mutual dependency in the combinations of gear-pairs, requires that the ratios in the sequence be substantially X*y, y, X2/y, . . X2(N-1)-2/y, X2N-2/y, where: N is the total number of gear-pairs, y is the ratio of the 2nd gear-pair, and X is the basic increment of change in the effective ratios of the combinations, and is the inverse root of the number of ratios less one, of the maximum ratio of the structure. The disclosed single countershaft transmissions may be either output speed decreasing or increasing, with the decrements of change -1- in the continuum ratios respectively from either a minimum when X is less than one, or a maximum when X is greater than one, to unity. The total number of continuum ratios in the transmissions with the disclosed series arrangements is the product of the number of ratios in each of the single countershaft structures, with the ratios in the sequence of gear-pairs of any added structure of the same order of those of any single countershaft structure, but with the value of X in the sequence substantially equal to X multiplied by the maximum ratio of the series up to the addition of the next structure in the ar- rangement. The mutual dependency in the combinations of each struct- ure is maintained, with the ratios of each structure permuted in combinations with those of the other structures to provide the con- tinuum ratios in the transmission. c) Background of the invention (i) Field of the invention The present invention relates to manual countershaft transmissions that are used in road and off-road vehicles, machinery, and other drive applications, where there is a need to alter either the torque or the speed of the output from the prime mover. (ii) Description of the Prior Art The structures of present manual countershaft transmissions in- corporate one gear-pair for each selectable ratio, with the gear-pairs selected independently either in or out of continuum. This method of selecting the ratio changes in countershaft transmissions requires a large number of gearpairs and relatively complex selecter mechanisms when more than five ratios are required. The following patents reflect the state-of-the-art techniques used to select the ratios in present manual countershaft transmissions: US 329,332 "Four Speed Change Speed Gear" Molly-January 10,33 Can 720,214 "Gear Changing Mechanism" Gronau-October 26, 1965 -2-
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