| 摘要 |
PURPOSE:To make four wheel driven running impossible at the time of high speed running and thereby prevent the overturning of a vehicle body by installing a mechanism prohibiting shift to the four wheel driven running when the change gear is in the high speed stage. CONSTITUTION:When high speed running is executed by turning a high speed switch 53 on, and entering high speed stage command H into a change gear 13, electric current is flowing at one end of a coil 55. Therefore, when the rear wheel becomes the center, a rear wheel steering center detection switch 57 is turned on, with the coil 55 electrified and a relay 54 operated, with a switch 56 shifted to the usually opened contact 56b. For this reason, even if four wheel driven running is attempted at by turning a four wheel driven run ning change-over switch on, the solenoid 27a of a steering change-over valve 27 is not electrified, so that no shift is made to the four wheel driven position II. As a result, it becomes impossible to shift to the four wheel driven mode at the time of high speed running. |
