Crawler Travel Unit

A crawler type travel unit comprising:

• a rear axle case of a travel machine body;
• a track frame swingably supported by said rear axle case through a rocking shaft;
• a front driven wheel disposed on a front end portion of said track frame;
• a rear driven wheel disposed on a rear end portion of said track frame;
• at least three idling wheels aligned between said front driven wheel and said rear driven wheel at intervals in a longitudinal direction;
• a rear axle supported by said rear axle case;
• a drive wheel which is disposed upward of a longitudinal intermediate portion of said track frame and is configured to receive power transmitted from said rear axle;
• and
• a crawler belt wrapped around said drive wheel, said front driven wheel, said rear driven wheel and said idling wheels,
• wherein each of two idling wheels on a rear side of said at least three idling wheels is pivoted on a first rocking link, and a longitudinal intermediate portion of said first rocking link is pivoted on said track frame through a first pivot shaft.