A crawler traveling apparatus includes a rubber crawler belt having a plurality
of driving projections formed with a predetermined peripheral pitch on an inner
peripheral face of the belt, a drive wheel rotatable when engaged with the driving
projections of the crawler belt for driving the belt, and a plurality of free wheels
rotatable for laterally guiding the driving projections under movement. Each driving
projection has an upper half having a lateral face including an upper half lateral
face portion and a lower half having a lower half lateral face portion, the upper
half lateral face portion having an erect inclination angle smaller than an erect
inclination angle of the lower half lateral face portion. Each free wheel has an
inner lateral face opposed to the driving projection, the inner lateral face having
an inclined guide face having an inclination parallel to the lower half lateral
face portion of the driving projection. The inclined guide face has a height L3
shorter than a height L1 of the lower half lateral face portion when
an inner peripheral face of the crawler belt is placed under proper contact with
an outer peripheral face of the free wheel.
