Patent ID: 7717201

Claim:
An undercarriage having a shock-absorption function, comprising: a pair of roller frames ( 20 ) facing each other; a main frame ( 50 ) disposed between the roller frames ( 20 ); a bridge ( 40 ) for connecting the main frame ( 50 ) to the roller frame ( 20 ); and wherein the bridge is a shock absorption bridge ( 40 ) having a stacked structure in which a plurality of vibration-proof rubber plates ( 40 - 2 ) for bridge and a plurality of steel plates ( 40 - 3 ) are alternately stacked, and wherein the pair of roller frames ( 20 ) include a plurality of vibration-proof rollers ( 10 ) inside thereof, at a lower portion thereof, and the vibration-proof rollers comprise a cylindrical roller body ( 10 - 6 ), a roller shaft ( 10 - 5 ) installed to pass through a center portion of the roller body ( 10 - 6 ), a collar unit ( 10 - 1 ) disposed on both sides of the roller shaft ( 10 - 5 ) and processed to have dove-tails at its end portions, a nut ( 10 - 3 ) for supporting the dove-tails of the collar unit ( 10 - 1 ) and fixing the vibration-proof roller ( 10 ), a bolt ( 10 - 2 ) associated with the vibration-proof roller ( 10 ) through the nut ( 10 - 3 ), and a vibration-proof rubber ( 10 - 4 ) for roller interposed between the collar unit ( 10 - 1 ) and the nut ( 10 - 3 ).