| 摘要 |
To enable mechanically stopping a malfunction of a lock-up mechanism. A hydrostatic continuously variable transmission is configured by connecting a swash plate type plunger hydraulic pump P and a swash plate type plunger hydraulic motor M via a hydraulic dosed circuit, an inclined angle of a swas h plate of the hydraulic motor is variably controlled, and continuous shift control is executed. There is provided a lock-up mechanism that closes the hydraulic closed circuit so as to make lockup executed when the quantity of oil that flows from the hydraulic pump into the hydraulic motor decreases according to variable control over the inclined angle of the swash plate and the input rotation of the hydraulic pump and the output rotation of the hydrauli c motor are substantially synchronous. The lock-up mechanism is operated when lockup control oil pressure is applied and closes the hydraulic closed circuit, however, a lockup control oil passage that supplies the lockup control oil pressure is provided with an opening opened and closed according to the inclination of the swash plate and the opening is closed when the inclined angle of the swash plate is in the vicinity of an angle in a upright condition.
|
