PURPOSE: To improve the durability of a hose, simplify the hose connection structure, and reduce the manufacturing cost by suppressing the deformation of the hose due to turn of a front bucket so as to give regularities to its movement and connecting the other end with a joint pin oil passage.
CONSTITUTION: When a pin joint section moves due to turn of a front bucket 1, one end of a hose 8 which leads lubricating oil is fixed on a rear bucket 3 through another relay member 7. In this case, only the other end of the hose 8 moves in the interlocking relationship with the travel of a pipe 14 which is accompanied by the turn of the front bucket 1 due to the travel of a relay member 10 in a long hole. That is, the length of the hose 8 is set to the length which corresponds to a predetermined dimension from the position of the relay member 7 to the vicinity of the long hole in advance to suppress the deformation of the hose 8 to the minimum extent. Moreover, regularities are given to the movement of the hose 8 to make it the movement similar to neck oscillation movement. The contact between the hose 8 and the front bucket 1 or the rear bucket 3 is prevented to prevent damage of the hose 8.
TAKAHASHI YUTAKA
WATANABE TOMONORI
HASHIMOTO AKIRA
HANEDA KIYOSHI
Next Patent: LUBRICATING OIL SUPPLY DEVICE IN PIN JOINT SECTION