Abstract: A rubber track assembly comprising a driving wheel, an idler wheel, an endless rubber track extending around the driving wheel and the idler wheel and having a plurality of rubber lugs formed on its outer circumference and a plurality of rubber guide projections formed on its inner surface, and a plurality of roller wheels arranged in contact with inner surface of the rubber track in a ground contact region thereof, each of the wheels has a pair of wheel portions formed at its opposite sides and spaced apart to be disposed at opposite sides of the guide projection for engaging the inner surface of the rubber track at the opposite sides of the guide projection. The rubber guide projection is provided with at least one low friction surface having a coefficient of friction lower than that of the rubber material of the rubber guide projection.

Abstract: A rubber track assembly comprising a driving wheel, an idler wheel, an endless rubber track extending around the driving wheel and the idler wheel and having a plurality of rubber lugs formed on its outer circumference and a plurality of rubber guide projections formed on its inner surface, and a plurality of roller wheels arranged in contact with inner surface of the rubber track in a ground contact region thereof, each of the wheels has a pair of wheel portions formed at its opposite sides and spaced apart to be disposed at opposite sides of the guide projection for engaging the inner surface of the rubber track at the opposite sides of the guide projection. The rubber guide projection is provided with at least one low friction surface having a coefficient of friction lower than that of the rubber material of the rubber guide projection.

Abstract: A core bar for a rubber track includes wings on both sides to be embedded in an elastic member of the rubber track, a bridging center for connecting the wings, and driving protrusions provided on both sides of the bridging center and projecting from the inner circumferential surface of the rubber track. The bridging center has at least one projection projecting from the wings in a longitudinal direction of the rubber track. Projections of the core bars embedded in the elastic member overlap with each other to form a continuous passage for a track roller. As an alternative, the core bar includes a driving center protrusion provided at the center of the core bar and adapted to engage a sprocket wheel for driving the rubber track and track roller traveling surfaces extending along the driving center protrusion on both sides thereof.

Abstract: A vibration isolating device is disclosed, which comprises a main vibration-absorbing body provided with a hollow chamber containing a vibration-damping liquid, and plural partition members each provided with a restricted passage to divide the hollow chamber into at least three small liquid chambers. In this device, one of the partition members is provided with a restricted passage having a sectional area larger than that of the restricted passage formed in the other remaining partition members.