Hydraulic traveling vehicle

摘要

A hydraulic traveling vehicle includes: an engine; wheels; a wheel shaft connected to the wheels; a hydraulic pump driven by the engine and thereby discharging a hydraulic oil; a first hydraulic motor and a second hydraulic motor actuated by a hydraulic pressure of the hydraulic oil discharged from the hydraulic pump and thereby generating drive power; a combining mechanism that can combine drive power generated by the first hydraulic motor and drive power generated by the second hydraulic motor, and a transmission mechanism that transmits drive power obtained from the combining mechanism to the wheel shaft so as to rotate the wheel shaft and the wheels. The second hydraulic motor is a variable displacement hydraulic motor that has a variable capacity; the combining mechanism includes a first rotating shaft that is connected to the transmission mechanism and is rotated by drive power generated by the first hydraulic motor, a second rotating shaft that is disposed coaxially with the first rotating shaft and is rotated in the same rotation direction as the first rotating shaft by drive power generated by the second hydraulic motor, and a first clutch having a first engagement portion that is joined to the first rotating shaft so as to rotate integrally with the first rotating shaft and a second engagement portion that is joined to the second rotating shaft so as to rotate integrally with the second rotating shaft; the first engagement portion and the second engagement portion can rotate in a rotation direction causing the hydraulic traveling vehicle to move forward when rotation power of the first engagement portion and the second engagement portion is transmitted to the wheels, and the first engagement portion is disposed with respect to the second engagement portion in such a manner that when a rotation speed of the second engagement portion in the rotation direction causing the hydraulic traveling vehicle to move forward increases and reaches a rotation speed equal to a rotation speed of the first engagement portion in the same rotation direction, the first engagement portion rotates integrally with the second engagement portion, while, when the rotation speed of the second engagement portion in the rotation direction causing the hydraulic traveling vehicle to move forward is below the rotation speed of the first engagement portion in the same rotation direction, the first engagement portion idles with respect to the second engagement portion.