Pin assembly of track roller bogie in crawler type traveling apparatus and crawler type traveling apparatus with the assembly

A pin assembly of a track roller bogie in a crawler type traveling apparatus, comprising:

• a pin including a lubricant filling hole therein and a lubricant outflow hole for outflow of lubricant from the lubricant filling hole to an outer peripheral portion;
• a first ring including an abutment face for abutting with the pin at one end and fixed to the pin;
• a second ring fitted on the pin to contact with a portion of an other end face of the first ring in a pin axis direction and to be rotable thereabout;
• and
• a third ring fixed to the pin to contact with a portion of an other end face of the second ring in the pin axis direction,
• wherein outside diameters of the first ring, the second ring, and the third ring are d1, d2, and d3, respectively, a relationship between d1, d2, d3 is d1<d2<d3,
• wherein the pin assembly further comprises an annular recessed groove portion in a portion between respective contact end faces of the first, second, and third rings, and sealing means to prevent leakage of the lubricant disposed in the recessed groove portion, and
• wherein the respective adjacent end faces, excluding the respective recessed groove portions, on inner periphery sides of the first, second, and third rings directly contact with one another.