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1. A modular crawler-track unit for a forest machine having an engine and a chassis with a pivot bearing, comprising:
a crawler-track frame; a sleeve axle attached to the crawler-track frame supporting the crawler-track frame on the pivot bearing belonging to the chassis of the forest machine; a crawler mat arranged in a circulation to distribute surface pressure of the crawler-track unit; at least one drive wheel, mounted in bearings in the crawler-track frame inside the circulation of the crawler mat, to rotate and support the crawler mat; at least one idler wheel, mounted in bearings in the crawler-track frame inside the circulation of the crawler mat, to support the crawler mat; a support structure arranged in the crawler-track frame, inside the circulation of the crawler mat, to support a part of the crawler mat that is against the ground, which support structure is arranged to conform according to a shape of a surface of the ground, to distribute surface pressure of the crawler-track unit evenly; a drive shaft mounted in bearings in the crawler-track frame, coaxially with the sleeve axle, to transmit power from the forest machine to the crawler-track unit and to pivot the crawler-track unit to the chassis of the forest machine; a shaft mounted in bearings on the crawler-track frame to pivot the drive wheel to the crawler-track frame at a distance from the drive shaft; and a power-transmission fitted between the shaft and the drive shaft to transmit power from the drive shaft to the drive wheel. |
