FORESTRY MACHINE HYDRAULIC DRIVE Russian patent published in 1995 - IPC

FIELD: forestry, wood industry. SUBSTANCE: hydraulic drive of machine has two hydraulic motors and control unit installed in delivery line of one of hydraulic motors. Control unit is made in form of two bypass valve installed in parallel relative to each other and hydraulically coupled, and non-return valve connected in series with bypass valves. In one position non-return valve disconnects, through bypass valves, the delivery lines of hydraulic motors and connects, through non-return valve, return line of one hydraulic motor with delivery line of other motor. In other position non-return valve connects delivery lines of hydraulic motors first through one and then through other bypass valves and disconnects by non-return valve the return line of one hydraulic motor from delivery line of other hydraulic motor. EFFECT: enlarged operating capabilities. 1 dwg