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A drive system for a tracked vehicle includes a composite transmission having a primary transmission unit and a secondary transmission unit which is driven by components of the primary transmission unit. The primary transmission unit includes a propulsion gear and a steering gear both of which are d

A drive system for a tracked vehicle includes a composite transmission having a primary transmission unit and a secondary transmission unit which is driven by components of the primary transmission unit. The primary transmission unit includes a propulsion gear and a steering gear both of which are driven from an engine drive shaft. The secondary transmission unit includes a pair of planetary gear sets which drive a pair of output wheels, tracks or chains of the vehicle. In order to conserve space, the transmission is configured such that the propulsion gear and the steering gear are positioned alongside the engine adjacent the drive shaft end of the engine and the secondary transmission components extend in front of the drive shaft end of the engine with a portion of each planetary gear set projecting alongside the engine. In an alternate embodiment, the propulsion gear and steering gear are positioned alongside the engine adjacent the drive shaft end while the secondary transmission components are positioned adjacent the opposite end of the engine.

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A drive system for a vehicle having an engine with a drive shaft, the engine extending a distance from end to end in a direction coincident with the drive shaft axis, the drive system including a transmission for both propulsion and steering of the vehicle by control of the rotational speed of vehic

A drive system for a vehicle having an engine with a drive shaft, the engine extending a distance from end to end in a direction coincident with the drive shaft axis, the drive system including a transmission for both propulsion and steering of the vehicle by control of the rotational speed of vehicle drive wheels, the transmission comprising a propulsion gear and a steering gear, means for drivingly interconnecting the propulsion gear and the steering gear with the engine drive shaft, a pair of planetary differential gear sets, the planetary gear sets being spaced from one another, a main shaft, means for drivingly interconnecting the main shaft and one segment of each planetary gear set, means for drivingly interconnecting the propulsion gear with the main shaft, a zero shaft, means for drivingly interconnecting the steering gear with the zero shaft, means for drivingly interconnecting the zero shaft with another segment of each planetary gear set, a pair of output shafts for propulsion of the vehicle drive wheels, and means for drivingly interconnecting a further segment of each planetary gear set with one of the output shafts, the main shaft and the zero shaft having axes parallel to one another and perpendicular to the axis of the drive shaft, the propulsion gear being mounted alongside the engine and projecting in a horizontal direction a distance between the ends of the engine, the steering gear being mounted alongside the engine and extending in a horizontal direction a distance between the ends of the engine, the main shaft being positioned adjacent one end of the engine and being spaced from the one end in a direction away from the engine, the propulsion gear and the steering gear being spaced from the main shaft in a direction toward the engine, the propulsion gear including an input shaft and an output shaft and the steering gear including an input shaft and an output shaft, the output shafts of the propulsion gear and the steering gear being parallel to the drive shaft axis, portions of the planetary gear sets projecting perpendicular to the axis of the main shaft, the drive system further including means forming a space between the projecting planetary gear set portions adjacent one side of the main shaft, the one end of the engine being positioned within the space, whereby an efficient drive system of reduced length is provided.