Patent ID: 7744169
Filing Date: 2010-06-29
Classification: B62D

Abstract:
1. 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.