Abstract: Amphibious vehicle power train (10) comprises engine (12) mounted above, or above and to one side of (FIGS. 2, 4) transmission (14). Axis (34) of crankshaft (18) is parallel to axis (36) of transmission input shaft (26), and to longitudinal vehicle axis (38). Crankshaft (18) longitudinally overlaps input shaft (26). Engine (12) is mounted North-South, and transmission (14) South-North. Crankshaft (18) drives input shaft (26) through sprockets (20, 22), connected by belt or chain (24); or by gears. Shaft (26) drives marine propulsion means (16) through drive shaft (30) and optional decoupler (28). Transmission (14) may be manual, sequential change manual, automated manual, seem-automatic, automatic, or continuously variable. Power train (10) may be mounted towards the rear of the vehicle, driving the rear wheels through differential (42). Alternatively, (FIGS. 3 and 4) the front wheels may also be driven, through drive shaft (44) and differential (46). Either axle may be decoupled in road mode.

Abstract: Power train for amphibious vehicle has an engine aligned with longitudinal vehicle axis, transmission, and power take off mounted between engine and transmission. At least one marine propulsion unit mounted at the rear of the vehicle, is driven by shaft, which runs alongside the transmission. Either transmission is offset to axis, and marine propulsion unit is on axis; or transmission is on axis, and the marine propulsion unit(s) are offset to axis. The driven road wheels may be the front wheels, the rear wheels, or all four. The engine may be at the front of the vehicle and the transmission at the back. Alternatively, the transmission may drive forward to a differential mounted adjacent to the engine sump, with wheel drive shaft passing through said pump.

Abstract: Amphibious vehicle power train 10 comprises a prime mover 12, transfer drive 14, transmission 16, and differential 17. A marine drive power take-off (PTO) comprises chain, belt, or gear drive, and optional decoupler 22. Rotational axis 65 of marine drive shaft 64 and impeller shaft 66 of centrifugal pump 68 are substantially perpendicular to longitudinal vehicle axis 11. The driven road wheels may be the rear wheels. Alternative embodiments comprise PTO drive from differential 17 (FIG. 3); from the crankshaft timing end (80, FIG. 4); or by a sandwich PTO between engine and transmission (56, FIG. 5). FIG. 6 shows PTO's from the gearbox of a motorcycle type power train, driving centrifugal pump 102 and differential 90. At least one further decoupler may be provided in wheel driveshafts 23, 25, to disconnect drive thereto while the amphibian is used in marine mode. The prime mover 12 may be an engine or may be an electric motor.

Abstract: A PTO (power take off) sprocket 65 driving belt or chain 80 is attached to input shaft 42 of a transversely mounted vehicle gearbox 40. The driving face of sprocket 65 is outside casting 52; its driven part 58 is attached to sprocket 46 by bolts 59, running in bearing 64 in flanged spigot 55. Shaft 42 is driven through sprocket 46 by belt or chain 48. Decouplers may be fitted to wheel drive shafts, and to the PTO drive at 76. FIGS. 3, 4, and 6 show automatic and manual gearboxes mounted alongside engines; FIG. 5 also shows marine jet drive 88, bevel gears 84, and Cardan shaft 82. FIG. 7 shows in-line transmission 240. FIG. 8 shows a sandwich PTO 365 with manual gearbox 341 and clutch assembly 336; or automatic gearbox 341 and torque converter 336. Applications are disclosed to semi-automatic, sequential shit automated manual, and CVT gearboxes.