Front wheel of crawler type traveling unit, crawler type traveling unit and working machine

摘要

The shaft 21 has a concave portion 21ea for storing the cooling medium on the outer peripheral surface 21aa. The roller 22a is rotatable with respect to the outer peripheral surface 21aa of the shaft 21 . The radial sliding bearing 23aa rotatably supports the roller 22a with respect to the outer peripheral surface 21aa of the shaft 21 . The floating seal 26a has a rotation-side member 26aR supported by the roller 22a, and a fixed-side member 26aF that slides with the rotation-side member 26aR. In the radial direction of the shaft 21, the concave portion 21ea is disposed on both the sliding portion of the rotating member 26aR and the stationary member 26aF in the floating seal 26a and the radial sliding bearing 23aa. are facing