Chain tensioning device

B - Operations – Transporting – 62 – D

Patent

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Details

B62D 55/30 (2006.01) B62D 55/112 (2006.01)

Patent

CA 2661427

The invention relates to a device for tensioning the chains of crawler vehicles, in particular the chains of hydraulic excavators, containing a first cylinder (6) which is arranged in the region of a chassis (2) of the tracked vehicle and which is operatively connected by means of a piston rod to a guide wheel (3) and which forms a tensioning cylinder, and a second cylinder (7) which is operatively connected to the first cylinder and which forms a spring cylinder, wherein the second cylinder (7) concentrically surrounds the first cylinder (6) so as to form a double cylinder, and each cylinder has a separate hydraulic connection, wherein when the tracked vehicle is started, the hydraulic connections of the double cylinder are pressurized with a predefinable pre-tensioning pressure, the spring cylinder can, on account of its relatively large cross-sectional area, be moved into its end position with maximum spring travel, and the tensioning cylinder pre-tensions the chain with a force which corresponds to the pre-tensioning pressure.

Dispositif pour tendre les chaînes de véhicules à chenilles, notamment les chaînes de pelles excavatrices hydrauliques. Il comprend un premier cylindre (6), constituant un cylindre tendeur, qui est disposé dans la région du train de roulement (2) du véhicule à chenilles et se trouve en liaison fonctionnelle avec une roue directrice (3) par l'intermédiaire d'une tige de piston, et un deuxième cylindre (7) constituant un cylindre de suspension et fonctionnellement relié au premier cylindre. Le deuxième cylindre (7) entoure concentriquement le premier cylindre (6) pour former un cylindre double, et chaque cylindre dispose d'un propre branchement hydraulique. Lors du démarrage du véhicule à chenilles, les branchements hydrauliques du cylindre double sont alimentés avec une pression de précontrainte prédéfinissable ; du fait de sa plus grande superficie de section, le cylindre de suspension peut être conduit dans sa position finale avec un débattement maximal, et le cylindre tendeur précontraint la chaîne avec une force qui correspond à la pression de précontrainte.

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