Patent ID: 6851768

Claim:
A structure for standardizing at least one part of a roller assembly for a construction vehicle so that said part can be used for a same size of construction vehicles having different structural specifications of a plurality of construction vehicle makers, (a) wherein said at least one part of the roller assembly includes at least one of a shell, a shaft, a floating seal and a bushing, each of configurations and dimensions in a radial direction and in an axial direction of said roller assembly, a kind of steel or material, and a heat treatment specification or a mechanical property of said at least one of said shell, said shaft, said floating seal and said bushing is unified over said same size of construction vehicles of said plurality of construction vehicle makers, while a dimension of said shaft in the axial direction of said roller assembly is varied according to said construction vehicles of said plurality of construction vehicle makers, and (b) wherein said at least one part of the roller assembly includes a collar, each of configurations and dimensions in the radial direction and in the axial direction of said roller assembly of a portion where said shaft is inserted and a portion where said floating seal is inserted, material, and a mechanical property of said collar is unified over said same size of construction vehicles of said plurality of construction vehicle makers, while a position, a diameter and a pitch of a coupling hole of said collar for use in coupling said collar to a track frame are allowed to be varied according to said construction vehicles of said plurality of construction vehicle makers.