A steering device for a vehicle includes a planet gear mechanism which can vary transmission ratio, and a lock mechanism for fixing the transmission ratio. The planet gear mechanism includes a first sun gear connected to a steering member, a second sun gear connected to turning wheels, a planet gear which is meshed with both the first and second sun gears and a carrier in an annular shape which supports the planet gear. The lock mechanism includes a restraining member which is engageable with the carrier thereby to restrain rotation of the carrier.

 
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< Steering angle sensor arrangement structure of vehicle intended for rough road use

> Transmission box for a wheeled machine particularly of the walking type

> Common pipelayer frame for multiple machine configurations

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