| 摘要 |
<p>A hydraulic system (12) is designed to control the movement between a frame member (24) and an agricultural work unit (16) pivotally coupled thereto. A first hydraulic cylinder 34 includes a cylinder housing (44), a ram (46) with a head (48) reciprocally disposed within the cylinder housing (44), a first chamber (47) on one side of the head (48), and a second chamber (49) on another side of the head (48). A first end of the first hydraulic cylinder (34) is attached to the frame member (24). A preload spring (36) has a first end (56) which is attached to the frame member (24), and a second end (60) which is attached to the second end (52) of the first hydraulic cylinder (34). A second hydraulic cylinder (38) is coupled between the frame member (24) and the work unit (16). The second hydraulic cylinder (38) includes a cylinder housing (64), a ram (66) with a head (68) reciprocally disposed within the cylinder housing (64) a first chamber (70) on one side of the head (68) and a second chamber (72) on another side of the head (68). A first fluid line (40) interconnects the first chamber (47, 70) of the first and second hydraulic cylinders (34) and (38). A second fluid line (42) interconnects the second chamber (49, 72) of the first and second hydraulic cylinders (34, 38). <IMAGE></p> |
