Abstract: Track roller for track-laying vehicles such as excavators having a shaft, a roller body rotatably supported thereon, two caps for limiting relative axial movement of shaft and roller body, and end pieces for attaching the track roller to the frame. The shaft has at its center a relatively large diameter, laterally thereof, spaced axially from each other, two relatively wide cylindrical bearing surfaces of larger diameter and, on its sides, ends of reduced diameter with elastic packings at suitable places between the end pieces and the caps and between the caps and the roller body, and an antifriction metal washer arranged between shaft and caps for the feeding of oil to those packings requiring lubrication which is effected from the oil space arranged between the bearing surfaces of the shaft and serves as an oil reservoir.

Abstract: A bumper for a suspension of a tracklaying vehicle has a first plate formed with a throughgoing hole through which engages one longitudinal end of a bolt. The other longitudinal end of this bolt is screwed into a second plate that is therefore held at a maximum spacing from the first plate. A helical compression spring having in unstressed condition an overall length greater by a predetermined distance than this maximum spacing is braced in compressed condition between the plates. Two telescoping sleeves, one fixed to each of the plates, coaxially surrounds the rod and have free ends extending past each other. Each of these ends has a respective abutment and these two abutments are spaced apart by a distance substantially equal to the difference between the length of the spring in the compressed and uncompressed condition. Thus should this rod break the two abutments will engage each other and prevent the first plate from being violently ejected.