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

Claim 0:
1. A riding work vehicle comprising:
a traveling vehicle body;
a vehicle body frame included in the traveling vehicle body and configured to support a vehicle body side case;
a plurality of traveling wheels supported to the vehicle body frame to be changeable in direction about a rotational axis of a vertically oriented transmission shaft;
an engine provided in the traveling vehicle body for driving the respective traveling wheels with power transmitted via the vertically oriented transmission shaft;
a vertically oriented transmission case configured to cover the circumference of the vertically oriented transmission shaft;
each of the vertically oriented transmission shaft and the vertically oriented transmission case is provided as an inner/outer double structure which is expandable/contractible while sliding in a direction of an axis of the vertically oriented transmission shaft;
the vertically oriented transmission case being supported to the vehicle body side case to be pivotable together with the traveling wheels about the rotational axis of the vertically oriented transmission shaft; and
a vehicle height adjustment mechanism capable of switching a relative height of the traveling wheels relative to the vehicle body frame in a plurality of steps by expanding/contracting the vertically oriented transmission shaft and the vertically oriented transmission case in the direction of the axis of the vertically oriented transmission shaft,
wherein:
the vehicle height adjustment mechanism includes a plurality of hydraulic cylinders extending along the direction of the axis of the vertically oriented transmission shaft and a base member for supporting the plurality of hydraulic cylinders;
the vertically oriented transmission case is provided as an inner/outer double structure that can be expanded/contracted in association with mutual sliding between an inner tubular member and an outer tubular member thereof; and
when the vertically oriented transmission case is expanded maximally, an outer circumferential side of an overlap portion where the inner tubular member and the outer tubular member are overlapped with each other is supported by the base member.