| 摘要 |
A slewing system for an excavating implement (6) has, in addition to two symmetrically arranged lateral pivot cylinders (8, 9), an additional pivot cylinder (16) located in a plane of symmetry therebetween and lying on a different level from the lateral cylinders (8, 9) and the pivot shaft (5) of the excavating implement (6). The centre cylinder (16) is jointed to a point of attachment (19) on the excavating implement (6) located on its centre line. The lever arm of the centre cylinder (16) about the axis of rotation (5) of the implement (6) is thus zero when the implement is in its centre position (as shown) and increases with increasing slewing angle. When the implement is swung out 90 DEG , the centre cylinder (16) has a maximum slewing effect. Flow limitors (33, 35) in the feeder lines (31, 32) of the centre cylinder, cause the centre cylinder to be used at the same time as a brake for automatically reducing the speed of slewing as the excavating implement approaches its end positions. <IMAGE> |
