Patent ID: 11926184
Assignee: KUBOTA CORPORATION
Field: Transport (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 6:
7. A riding work vehicle comprising:
a traveling vehicle body;
a vehicle body frame;
a traveling wheel supported to the traveling vehicle body, with relative height thereof relative to the vehicle body frame being changeable;
a hydraulic cylinder configured to be capable of switching over the relative height of the traveling wheel relative to the vehicle body frame;
an operation amount detecting device for detecting an expansion/contraction operation amount of the hydraulic cylinder; and
a first member and a second member which move relative to each other in association with expansion/contraction of the hydraulic cylinder;
wherein the operation amount detecting device includes:
a screw shaft configured to be movable together with one of the first member and the second member, the screw shaft having a helical blade on an outer circumferential portion thereof;
a sliding contact member provided in the other of the first member and the second member, the sliding contact member coming into sliding contact with the helical blade in association with relative movement between the first member and the second member, thereby rotatably guiding the screw shaft; and
a rotation detection sensor configured to be capable of detecting a rotational count of the screw shaft; and

wherein the expansion/contraction operation amount of the hydraulic cylinder is detected based on the rotational count detected by the rotation detection sensor.