Patent ID: 8851583

Claim:
Track ( 10 ) for track-type vehicles, comprising a continuous sequence of articulated joints ( 12 , 12 ′) of the hinge type, and comprising pins ( 36 , 36 ′) oriented according to a first axis (A-A) substantially perpendicular to the longitudinal central axis (B-B) of the track ( 10 ), said articulated joints ( 12 , 12 ′) being connected to each other and maintained at a constant distance through pairs of links ( 14 ) having longitudinal development, arranged laterally and symmetrically with respect to said longitudinal central axis (B-B), each link ( 14 ) being provided with a first end flange ( 16 ) facing outwards of the track ( 10 ), with reference to said longitudinal central axis (B-B), and with a second end flange ( 18 ) facing inwards of the track ( 10 ), with reference to said longitudinal central axis ( 13 -B), each link ( 14 ) being provided with a first upper surface ( 20 ) and a second lower guide surface ( 24 ), opposite with respect to said first upper surface ( 20 ), made on said first end flange ( 16 ) being a first through hole ( 26 ), oriented according to said first axis (A-A) , fur the non-rotatable connection of said link ( 14 ) with one of the pins ( 36 , 36 ′) of said articulated joint ( 12 , 12 ′), and made on said second end flange ( 18 ) being a second through hole ( 32 ), oriented according to said first axis (A-A), for the rotatable connection of said link ( 14 ) with one of said pins ( 36 , 36 ′), at least an annular sliding bearing ( 44 ) being housed inside said second through hole ( 32 ) of each link ( 14 ), characterized in that said sliding bearing ( 44 ) is made from a composite material consisting of a natural or synthetic fiber and a binding resin, and in that: the ratio (R 0 ) between the internal diameter (D 2 )of the second through hole( 32 ) of the second end flange ( 18 ) of each link ( 14 ) and the internal diameter(D 1 ) of the first through hole ( 26 ) of the first end flange ( 16 ) of each link ( 14 ) is smaller than 1.25, the ratio (R 1 ) between the thickness (S) and the internal diameter (D) of said sliding bearing ( 44 ) is comprised in the range between 0.02 and 0.1, the ratio (R 2 ) between the overall width (L 1 )of said second lower guide surface ( 24 ) and the overall thickness (L 2 ) of said first end flange ( 16 ) is greater than 1, the ratio (R 3 ) between the overall width (L 1 ) of said second lower guide surface ( 24 ) and an offset (L 3 ) between an external surface of said first end flange ( 16 ) and an external edge of said second lower guide surface ( 24 ) is greater than 1.35, and the ratio (R 4 ) between the overall thickness (L 2 ) of said first end flange ( 16 ) and the overall thickness (L 4 ) of said second end flange ( 18 ) is smaller than 1.25.