| 摘要 |
PURPOSE: To avoid the occurrence of such an inconvenience that a machine stops without turning when switching from a straight forward run to a turning run. CONSTITUTION: When a turning run in which one claw clutch 23 is switched to a transmission state from a straight forward run in which both right and left claw clutches 23 are switched to the transmission state is started, a friction clutch 29 is switched gradually from a connected state to a disconnected state according to the switching of one claw clutch 23 to a non-transmission state. When the turn running in which one claw clutch 23 is switched from a non- transmission state to the transmission state is terminated, the friction clutch 29 is switched gradually from the disconnected state to the connected state at a stage before one claw clutch 23 is switched to the transmission state. In the straight forward running state, the disconnected state of the friction clutch 29 is produced. When turning is started, the connected state of the friction clutch 29 is produced at a stage before one claw clutch 23 is switched from the transmission state to the non-transmission state.
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