CONFLUENCE STYLE VARIABLE CAPACITY TYPE TWO-PUMP HYDRAULIC CIRCUIT

摘要

PURPOSE:To improve speed controllability by adopting a detection pilot line to detect a pump-out pressure of the other side through a confluence valve inside each unit hydraulic circuit as well as providing a confluence valve between two of unit hydraulic circuits. CONSTITUTION:A confluence valve control device 300 is provided between two of unit hydraulic circuits 100 and 200. This confluence valve control device 300 consists of two of confluence valves 312 and 313 connecting each of pump- out lines 26 and 126 to respective pump-out lines 126 and 26 of their respective opposite side unit hydraulic circuits 200 and 100, and opposite side pump pressure detection pilot lines 314 and 315 connected to the pump-out lines 26 and 126 of respective circuits 100 and 200 through these confluence valves 312 and 313 and detecting a pump-out pressure of the opposite side in the respective circuits 200 and 100 thereby. Consequently, it is possible to smoothly drive it at an ordinary driving speed up to the desired high speed.