US 4,589,295 AGranted

Eight speed drop box transmission

AssigneeChampion Road Machinery Limited

InventorsJames H. Jerry, Garry J. VanderEyk

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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.

Claims24

Dependent claims

A drop box transmission comprising a casing, an input shaft and an output shaft said input shaft and said output shaft being selectively interconnected by a plurality of gears at least some of which are controlled by clutches, said input shaft carrying thereon a high gear and an associated clutch and a low gear and associated clutch, said high and low input gears each meshing with a further gear fixed on a first intermediate shaft, said first intermediate shaft also supporting first intermediate shaft high and low gears each having an associated clutch, a second intermediate shaft located between said first intermediate shaft and said output shaft carrying at least 3 fixed gears on said second intermediate shaft two of which are in mesh with said high and low gears of said first intermediate shaft and two of said at least 3 gears being in mesh with high and low gears on said output shaft with all said at least 3 gears being in mesh with at least one other gear, said high and low gears on said output shaft each being controlled by an associated clutch, said clutches by selective activation of three thereof providing 8 different combinations of gears for driving said output shaft at various speeds relative to said input shaft.

A drop box transmission comprising an input shaft, a first intermediate shaft, a second intermediate shaft and an output shaft, said input and output shafts being interconnected by gears such that said input shaft drives said first intermediate shaft which drives said second intermediate shaft which drives said output shaft for selectively driving said output shaft at various speeds relative to said input shaft, said input shaft carrying thereon a high gear meshing with a first driven gear on said first intermediate shaft and including

first clutch means associated therewith for selectively driving said first intermediate shaft and said input shaft carrying thereon a low gear meshing with a second driven gear on said first intermediate shaft;
second clutch means associated therewith for selectively driving said first intermediate shaft;
said first intermediate shaft also supporting first intermediate shaft high and low gears, said second intermediate shaft carrying at least 3 gears thereon two of which are in mesh with said high and low gears of said first intermediate shaft, at least two of said at least 3 gears being in mesh with high and low gears on said output shaft such that at least one of said two gears only meshes with a gear on said output shaft;
third clutch means associated with said high gear of said intermediate shaft and said gear on said second intermediate shaft in mesh therewith for selectively driving said second intermediate shaft;
fourth clutch means associated with said low gear of said intermediate shaft and said gear on said second intermediate shaft in mesh therewith for selectively driving said second intermediate shaft;
fifth clutch means associated with said high gear of said output shaft and said gear on said second intermediate shaft in mesh therewith for selectively driving said output shaft;
and
sixth clutch means associated with said low gear of said output shaft and said gear on said second intermediate shaft in mesh therewith for selectively driving said output shaft;
said clutch means by selective activation of three thereof providing 8 different combinations of gears for driving said output shaft at various speeds relative to said input shaft.

6 more elements

Dependencies are inferred from the claim text.