Eight speed drop box transmission

Details Eight speed drop box transmission Eight speed drop box transmission

1984-01-30

1986-05-20

Krizmanich, George H.

Machine element or mechanism

Gearing

Interchangeably locked

74331, 74333, F16H 308

Patent

active

045892954

ABSTRACT:
A drop box transmission suitable for drawbar pull vehicles or vehicles adapted to push obstacles or non-powered equipment and of a simplified construction. The transmission provides 8 different forward speeds and is easily adapted to provide either 4 or 8 reverse speeds. In one embodiment 8 forward speeds, 4 reverse speeds and full power shift capability is provided using of 14 gears, 5 shafts and 7 clutches. The reverse shaft is in constant mesh with the input shaft and includes at least one clutch controlled gear for driving the first intermediate shaft. Two clutched controlled gears are provided on the input shaft and are disengaged in the reverse mode. The output shaft having two clutch controlled gears is driven by a secondary intermediate shaft having at least 3 fixed gears thereon. In the case of only 3 gears on the secondary shaft one of the gears is in mesh with a clutch controlled gear on the first intermediate shaft and a clutch controlled gear on the output shaft.

REFERENCES:
patent: 2804780 (1957-09-01), Gerst
patent: 2953942 (1960-09-01), Schwartz et al.
patent: 2958231 (1960-11-01), Gerst
patent: 2972901 (1961-02-01), Gerst
patent: 3181385 (1965-05-01), Siler
patent: 3248971 (1966-05-01), Lee et al.
patent: 3344679 (1967-10-01), Zeller
TD-122-1402, "Powershift Transmission for Four Wheel Drive Farm Tractors", Twin Disc, Inc., Feb. 1980.

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