HYDRAULIC DRIVE WITH RAPID STROKE AND LOAD STROKE

摘要

A hydraulic drive including at least one hydraulic cylinder that includes a piston chamber, an annulus and a piston that separates the piston chamber from the annulus. The hydraulic drive further includes a first hydraulic pump that has a pump intake and a pump outlet, a directional control valve that has a first and a second switching position, and a second hydraulic pump. The second hydraulic pump has a direction of delivery that is consistent with the direction of delivery of the first hydraulic pump at the pump outlet, wherein the second hydraulic pump in the first switching position of the directional control valve is hydraulically connected with the piston chamber and the second hydraulic pump in the second switching position of the directional control valve is not hydraulically connected with the piston chamber.

主权项

1. A hydraulic drive for a hydraulic press, said hydraulic drive comprising:
at least one hydraulic cylinder, including:
a piston chamber and an annulus; anda piston that separates said piston chamber from said annulus; a first hydraulic pump having a direction of delivery, said first hydraulic pump including:
a pump intake hydraulically connected with said annulus; anda pump outlet hydraulically connected with said piston chamber; a second hydraulic pump having a direction of delivery that is consistent with said direction of delivery of the first hydraulic pump at said pump outlet; and a directional control valve that has a first switching position and a second switching position, wherein said second hydraulic pump in said first switching position of the directional control valve is hydraulically connected with said piston chamber and wherein said second hydraulic pump in said second switching position of the directional control valve is not hydraulically connected with said piston chamber.