| 摘要 |
<p>GEARED STEERING MEANS A geared steering clutch mechanism (18) for use in a vehicle having left and right side propelling devices(11,12), such as tracks, a power drive (16), and a final drive (15) connecting the power drive to the respective left and right propelling devices. The steering clutch mechanism includes a first clutch (24) selectively operable to connect the power drive to the associated final drive to provide a high speed connection therebetween, a speed reduction gear assembly (55,56,58), a second clutch (45) selectively operable to connect the power drive to the associated final drive through the speed reduction gear assembly to provide a reduced speed connection therebetween, and a brake (38) for braking the final drive concurrently with arranging the clutches to positively disconnect the power drive from the final drive. The final drive may be a multispeed drive so that the use of the clutch mechanism provides a two-time multiplication of the number of available output speeds as a function of the selective operation of the clutches. The speed reduction gear assembly may include a planetary gear (56) in meshing engagement with a sun gear (55) connected to the second clutch. The first clutch may be arranged to provide a substantially direct one-to-one driving connection between the power drive and final drive.</p> |
