| 摘要 |
Provided is a hydraulic circuit for transmissions with which, while suppressing the hydraulic circuit from becoming complicated, it is possible to suppress an operational failure and a drop in the oil pressure of the hydraulic circuit, and to stabilize an oil pressure in the hydraulic circuit. The CVT 1 includes a part to be lubricated and a hydraulic control part for controlling transmission. The hydraulic circuit for transmissions includes a hydraulic oil pathway 3 for supplying oil from the pump apparatus 8 to the hydraulic control part 2, and a lubricating oil pathway 5 for supplying oil containing an air bubble to the part to be lubricated 4. The pump apparatus 8 includes a multi-stage trochoid pump 9 and has an air bubble-containing oil discharging part 11 for discharging the oil containing an air bubble to the first stage trochoid pump part 6. The air bubble-containing oil discharging part 11 is connected to the lubricating oil pathway 5. The second stage trochoid pump part 7 increases pressure of the oil discharged from the first stage trochoid pump part 6, and discharges it from the high-pressure oil discharging part 13. The hydraulic oil pathway 3 is connected to the high-pressure oil discharging part 13. |
