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    • 9. 发明专利
    • STEERING OPERATING DEVICE FOR WORKING VEHICLE
    • JPH0270579A
    • 1990-03-09
    • JP22395488
    • 1988-09-07
    • KUBOTA LTD
    • MIZUMOTO MASAYAODAWARA TETSUKAZU
    • B62D11/12
    • PURPOSE:To improve operability at the time of manual steering by constructing the title device so as to gradually increase the driving speed difference between running gears as the elapsed time becomes longer at the time of manual steering and maintain the set quantity at the time of automatic steering. CONSTITUTION:A manual operating type steering indicating means 16 for indicating the steering direction at a manual operating time and a steering control sensor 19 for detecting the steering direction at an automatic steering time are provided so as to enable the steering operation in either form of manual or automatic steering. When the steering is manually operated, the driving speed difference between a pair of right and left running gears 1 is controlled to be gradually increased as the elapsed time from the operation starting time of the manual operating type steering indicating means 16 becomes longer. Accordingly, the longer the time for steering indication by the manual operating type steering indicating means becomes, the larger the driving speed difference between the right and left running gears becomes, and the turning radius thereby becomes smaller.