Suspension device for tracked vehicles

A suspension device for a tracked forwarder, which forwarder comprises a pair of track assemblies where one track assembly is located on each side of a center beam that is a component of a chassis of the forwarder, and each track assembly comprises a track support beam, a first wheel that is mounted in bearings in a manner that allows rotation at a forward end of the track support beam, a second wheel that is mounted in bearings in a manner that allows rotation of the second wheel at a rear end of the track support beam, and of which wheels one is a driving wheel, several support wheels and an endless track that in a driving manner runs over the wheels and support wheels in a plane of rotation, a first suspension mounting with which each support wheel is suspended at the track support beam in a manner that allows pivoting at one end of a support wheel pendulum arm, a second suspension mounting comprising a combination of a first spring strut and a first spring-damping pendulum arm and a combination of a second spring strut and a second spring-damping pendulum arm with which combinations the center beam of the chassis is spring-damped at a forward and rear end of the track support beam, wherein

• each spring strut comprises a gas hydraulic configuration comprising a hydraulic cylinder,
• the first suspension mounting comprises tandem arms levers having two legs arranged in a V-shape and equipped with support wheels which, via a hub, are pivotably suspended in the track support beam,
• each of the first and second spring-damping pendulum arms of the second suspension mounting comprises a double-armed lever, of which one lever and a second lever are mutually united at an intermediate web,
• that the intermediate web at each first and second double-armed lever formed in this way is mounted in bearings in a manner that allows pivoting at an axis at a joint in the center beam of the chassis such that the double-armed levers can pivot in planes that are parallel with the plane of rotation of the track,
• that the one lever of each first and second double-armed lever formed in this way is mounted in bearings in a manner that allows pivoting at an axis at a joint in the track support beam,
• that the second lever of each first and second double-armed lever formed in this way is united in a manner that transfers power with the center beam of the chassis through one of the first and second spring struts, and
• that the center beam that is supported in a spring-damped manner at the track support beam can pivot and its level above ground and attitude can be controlled within a pre-determined specified range of angles by the spring struts.