Abstract: A track for a tracked vehicle has a front idler wheel carried on a frame and a front double roller member carried on the frame construction rearward of the front idler wheel. The front idler wheel and the roller member are independently pivotally mounted on the frame by pivotal levers for upward and downward suspension movement in response to change in ground level. An actuating lever extends rearwardly from the front idler wheel over the pivotal lever of the double roller and a gas bag spring is located between the actuating lever and the double roller to absorb some upward movement of the front idler wheel so as to avoid transfer of a proportional downward movement to the roller member.

Abstract: A tracked-vehicle drive has a wheel rotatably driven about an axis and having an outer surface, an endless traction element spanned over and frictionally engaging the wheel so as to be advanced thereby when the wheel rotates and having an inner face formed with an endless row of spaced teeth, and an auxiliary drive member displaceable adjacent the traction element and formed with an endless row of spaced entrainment formations in constant mesh with the teeth so that the drive member is displaced synchronously with the traction element. A coupling body having entrainment formations in constant mesh with the drive-member entrainment formations is engageable with the wheel outer surface. The body can be coupled to the wheel for positive driving of the traction element from the wheel via the member and body and can be decoupled from the wheel for frictional coupling of the traction element by the wheel.

Abstract: A drive system, especially a belt drive for a multi-axial vehicle running gear, has a drive drum about which the belt is looped and provided with a ring with entrainers which engage teeth on the belt when there is slip between the belt and the drum. Limited rotation of the ring relative to the drum may be effected by elliptical spring elements coupling the ring and the drum or by clutches on the drum which frequently lock the ring to the drum so as to effect control engagement of the entrainers with the belt teeth and positive drive of the belt by the drum.