Road construction machine, crawler track unit of a road construction machine, as well as method for tensioning a chain of a crawler track unit

摘要

In a road construction machine, in particular a road milling machine (1), with a machine frame (2), and a chassis (4) with preferably several crawler track units (6), said chassis (4) carrying the machine frame (2), where the crawler track units (6) comprise a chain (12) which continuously revolves around at least one guide wheel (8) and at least one drive wheel (10), as well as several track rollers (14) which roll on the chain (12) and carry the machine frame (2), where the drive wheel (10) or preferably the guide wheel (8) is provided with an adjustment device (18), which enables the reciprocal spacing of the axles (20,22) of the drive wheel and guide wheel (8,10) to be adjusted for adaptation to a current lengthening of the chain (12), and where in addition to the adjustment device (18), a spring element (24) is provided which allows, using the adjusted spacing as a basis, a shortening of the spacing between the axles (20,22) of the drive wheel and guide wheel (8,10) against the spring force in the event of an operation-related increase of the chain tension to prevent any tension peaks in the chain (12), it is provided that the adjustment device (18) comprises a piston-cylinder unit (28) with a piston (30) to which a preferably hydraulic operating pressure can be applied in order to generate a predetermined force of the piston (30), and that, upon reaching the predetermined chain tension, a locking device (34) locks the end position of the piston (30) of the piston-cylinder unit (28) reached under the operating pressure applied.

主权项

1. A road construction machine, with
a machine frame, and a chassis with a plurality of crawler track units, said chassis carrying the machine frame, where the crawler track units comprise a chain which continuously revolves around at least one guide wheel and at least one drive wheel, as well as a plurality of track rollers which roll on the chain and carry the machine frame, where an adjustment device acts on the drive wheel or on the guide wheel, enabling a reciprocal spacing of axles of the drive wheel and guide wheel to be adjusted for adaptation to a lengthening of the chain, and where in addition to the adjustment device, a spring element is provided which allows, using the adjusted spacing as a basis, a shortening of the spacing between the axles of the drive wheel and guide wheel against the spring force in the event of an operation-related increase of the chain tension to prevent any tension peaks in the chain,wherein
the adjustment device comprises a piston-cylinder unit with a piston to which a hydraulic adjusting pressure can be applied in order to generate a predetermined force of the piston, and the adjustment device is configured such that, upon reaching a predetermined chain tension and prior to engaging the crawler track units to drive the road construction machine, a locking device locks an end position of the piston of the piston-cylinder unit reached under the adjusting pressure applied.