Patent ID: 7032378

Claim:
A flow divider system used in a hydraulic circuit for a work machine including a boom cylinder for operating a boom and a bucket cylinder for operating a bucket, the boom cylinder having one-boom chamber and an other-boom chamber operative in response to a pressured oil supplied into the chambers thereof, the bucket cylinder having one-bucket chamber and an other-bucket chamber operative in response to a pressured oil supplied into the chambers thereof, the flow divider system comprising; a first passage disposed between said one-boom chamber and said other-bucket chamber and connecting with said one-boom chamber; a second passage connecting with said first passage and leading to said other-bucket chamber; a third passage connecting with said first passage and leading to a tank; a first orifice interposed between said first and second passages; a second orifice interposed between said first and third passages; and a flow dividing valve disposed downstream of said first and second orifices so as to maintain a specified pressure difference between a pressure downstream of said first orifice and a pressure downstream of said second orifice, wherein the pressured oil drained from said one-boom chamber is divided into a flow to said other-bucket chamber and a flow to a tank respectively via said first and second orifices and said flow dividing valve, and said first and second orifices are configured of variable orifices so as to reduce respective opening degrees of the first and second orifices when a flow amount of the pressured oil drained from said one-boom chamber decreases.