METERLESS HYDRAULIC SYSTEM HAVING FLOW SHARING AND COMBINING FUNCTIONALITY

摘要

A hydraulic system (56) includes a variable-displacement first pump (68A, 68D), a variable-displacement second pump (68B, 68C), and a first actuator (32, 34, 42L, 42R) selectively connected either to the first pump in a closed loop manner and not the second pump, or to the first and second pumps in a closed loop manner. The hydraulic system also includes a second actuator (26, 32, 34) selectively connected either to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner. The hydraulic system further includes a variable-displacement rotary actuator (43, 42L, 42R) selectively connected either to the first pump in a closed loop manner and not the second pump, or to the first and second pumps in a closed loop manner.