Patent ID: 9272729
Filing Date: 2016-03-01
CPC Classification: B62D

Claim Text:
1. A steering device for vehicle comprising: a steering handle for an operator to perform a steering operation of a steering wheel; a steering valve for controlling supply and discharge of pressurized oil in response to the operation of said steering handle; a steering cylinder for steering a vehicle by the pressurized oil supplied/discharged through said steering valve; a steering angle detecting unit configured to detect a steering angle θ of said steering wheel; a straight-ahead state detecting unit configured to determine whether or not said steering wheel is in a straight-ahead state; an abnormality determining unit configured to, when the steering angle θ detected by said steering angle detecting unit is different from a detection result by said straight-ahead state detecting unit, determine that at least one of said steering angle detecting unit and said straight-ahead state detecting unit is abnormal; and a steering mechanism for steering said steering wheel that is comprised of a trailing arm having a base side attached to a vehicle body of said vehicle, a spindle that is attached to a tip side of said trailing arm to be rotatable in a front-rear direction to rotatably support said steering wheel, a knuckle arm that is provided in said spindle, and said steering cylinder that is provided between said knuckle arm and said trailing arm to rotate said spindle to said trailing arm, wherein said steering angle detecting unit comprises a rotating part rotating together with said spindle, and a fixing part that is fixed to said trailing arm to detect a rotating displacement between said rotating part and said fixing part, wherein said straight-ahead state detecting unit is comprised of a detecting part that is attached to said trailing arm, and a detecting plate that rotates together with said spindle and has a length corresponding to an angle range of the steering angle θ in which said steering wheel is in the straight-ahead state, wherein said detecting plate opposes said detecting part when said steering wheel is in the straight-ahead state, and is away from a position opposing said detecting part when said steering wheel is in a non-straight-ahead state.