Patent ID: 6889805
Filing Date: 2005-05-10
Classification: F16D,F16H

Abstract:
1. A clutch hydraulic mechanism for switching between speed gear hydraulic clutches corresponding to an operation of a clutch operating lever, the mechanism being employed in industrial trucks using torque converters, the improvement comprising: a check valve provided for each of the speed gear hydraulic clutches, said check valve being installed in a hydraulic line for hydraulic oil being fed to the speed gear hydraulic clutch; an accumulator provided for each of the speed gear hydraulic clutches, said accumulator being disposed between the check valve and the speed gear hydraulic clutch and accumulating some amount of the hydraulic oil therein; a control spool provided for each of the speed gear hydraulic clutches, said control spool being operated by the hydraulic oil fed to the speed gear hydraulic clutch shifted from another speed gear and cooperating with the check valve to hold, for a predetermined period of time, the hydraulic oil accumulated in the accumulator; and an orifice provided for each of the speed gear hydraulic clutches, said orifice being inserted in the hydraulic line for releasing the hydraulic oil held by the control spool from the control spool, thereby suppressing discharge of the hydraulic oil.