| 摘要 |
PURPOSE:To simplify construction of a device further surely perform its operation, by additionally providing a lubricating circuit on the side, where the Pitot pressure of a speed change control valve acts corresponding to an engine speed, and changing a Pitot pressure characteristic according to the existance labsence of lubricating back pressure. CONSTITUTION:A piston 62 is inserted, via a spring 61 toward a spool 46, in a chamber 45A, communicated to a Pitot pressure port 45a of a speed change control valve 44, and a lubricating oil supply chamber 63, is formed on the side of the piston 62 opposite to the spool 46, and a lubricating circuit 65 having a changing mechanism 60 of Pitot pressure characteristic is additionally provided. In this way, construction of a device is simplified further its operation is surely performed because a lubricating oil pressure obtained on the drain side is utilized to change the Pitot pressure characteristic by the existence labsence of lubricating back pressure. |
