Mattingly & Malur, PC
Transportation vehicle
An object is to restrain a hoist shaft and a bushing of a hoist cylinder from abrading. A haulage vehicle with a pivoting vessel has a telescoping hoist cylinder provided between the vessel and the vehicle. Supply of hydraulic oil to the hoist cylinder is controlled by a valve provided between the hydraulic power source and the hoist cylinder. The haulage vehicle is provided with a bushing at one end portion of the hoist cylinder; a hoist shaft is mounted in a through bore of the bushing; a lubricant supplier supplies lubricant to a clearance between a surface of the hoist shaft and an internal surface of the through bore of the bushing; and when the vessel is seated on the vehicle, a controller controls the valve to make the hoist cylinder contract and also supply lubricant to the clearance.
HITACHI CONSTRUCTION MACHINERY CO., LTD.
B B B
B60P B60P B60P
inventional inventional inventional
Toshikazu Akira Hirokazu
Minoshima Ohno Shimomura