| 摘要 |
PURPOSE:To make it possible to facilitate the coincidence of rotational speeds of two hydraulic motors for two right and left crawlers, by communicating the suction side and discharge side of each hydraulic motor through an orifice restrictor. CONSTITUTION:There are provided two hydraulic motors 1 for driving right and left crawlers in a small size construction vehicle such as for example, a mini-back hoe. A travelling hydraulic circuit for driving and controlling these two hydraulic motors 1 includes, for each hydraulic motor, a counterbalance valve 2, a selector valve 4, a hydraulic pump 5 which is driven by a common prime mover E, and the like. In the above-mentioned hydraulic circuit, a circuit for communicating the suction side and the discharge side of each hydraulic motor is provided between the counterbalance valve and the selector valve, and is disposed therein with an orifice restrictor 3 which is adjusted so that the rotational speeds of the right and left hydraulic motors coincide with each other if the speeds filter from each other.
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