Hydraulic control device for working vehicle

• Main Authors: YAMASHITA RYOUHEI, KOBAYASHI YOSHINOBU, KOBAYASHI TAKESHI, MATSUZAKI HIROSHI, ANDOU MASAAKI, UENO KATSUMI
• Format: Patent
• Language: Chinese; English
• Published: 27.02.2013
• Subjects: BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; DREDGING; ENGINE PLANTS IN GENERAL; FIXED CONSTRUCTIONS; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; FOUNDATIONS; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; HYDRAULIC ENGINEERING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; SOIL SHIFTING; STEAM ENGINES; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; WEAPONS

The invention provides a hydraulic control device for a working vehicle. A control valve (29) for a boom and a pulsation absorption control valve (33) are provided in the middle of a center bypass conduit (21). The pulsation absorption control valve (33) is disposed at a position downstream of the control valve (29) for a boom. The pulsation absorption control valve (33) is switched between a shut-off position (d) and a connected position (e) by a pilot pressure from a remote operation valve (51). The pulsation absorption control valve (33) is configured in such a manner that one main conduit (32A) of a pair of main conduits (32A, 32B) is connected to or shut off from an accumulator (38) through one connection conduit (36A) and the other main conduit (32B) is connected to or shut off from the tank (11) side through the other connection conduit (36B). The accumulator (38) is caused to operate as a dynamic damper during the travel of the vehicle. The configuration can simplify the structure of the connection co