STEERING DEVICE FOR VEHICLE

摘要

Front wheels (6L, 6R) a steering operation of which is possible by a steering mechanism (12) are mounted on a vehicle body (2). Steering cylinders (22L, 22R) of the steering mechanism (12) extend and contract in response to an operation of a steering handle (27) provided in a cab (5) to perform the steering operation of the front wheels (6L, 6R). The steering mechanism (12) is provided with a rotation angle sensor (28) for detecting a steering angle θ of the left front wheel (6L) and a proximity switch (29) for detecting whether or not the front wheel (6L) is in a straight-ahead state. A controller (30) determines that the rotation angle sensor (28) or the proximity switch (29) is abnormal when the steering angle (θ) detected by the rotation angle sensor (28) is different from the detection result by the proximity switch (29).

主权项

1. A steering device for vehicle comprising:
a steering handle (27) for an operator to perform a steering operation of a steering wheel (6L, 6R); a steering valve (26) for controlling supply and discharge of pressurized oil in response to the operation of said steering handle (27); and a steering cylinder (22L, 22R) for steering a vehicle by the pressurized oil supplied/discharged through said steering valve (26); characterized in that: a steering angle detecting unit (28) configured to detect a steering angle θ of said steering wheel (6L, 6R); a straight-ahead state detecting unit (29, 42) configured to determine whether or not said steering wheel (6L, 6R) is in a straight-ahead state on condition that said vehicle can take a straight-ahead driving; and an abnormality determining unit (30) configured to, when the steering angle (θ) detected by said steering angle detecting unit (28) is different from the detection result by said straight-ahead state detecting unit (29, 42), determine that at least one of said steering angle detecting unit (28) and said straight-ahead state detecting unit (29, 42) is abnormal.