Hydrostatic continuously variable transmission

F - Mech Eng,Light,Heat,Weapons – 16 – H

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Details

F16H 39/14 (2006.01) F16H 61/66 (2006.01)

Patent

CA 2627655

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 swash 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 hydraulic 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.

Ce document décrit une méthode pour stopper mécaniquement un dispositif de verrouillage défectueux. Une transmission hydrostatique à variation continue est configurée en reliant une pompe hydraulique à piston plongeur et à plateau oscillant « P » à un moteur hydraulique à plateau oscillant « M » par l'intermédiaire d'un circuit hydraulique régulé. L'inclinaison du plateau oscillant du moteur hydraulique est contrôlée de façon variable en continu. Le dispositif comprend un mécanisme de verrouillage qui ferme le circuit hydraulique lorsque la quantité d'huile poussée de la pompe vers le moteur hydraulique tombe sous un seuil relatif au contrôle variable de l'angle du plateau oscillant, et que la vitesse de rotation d'admission de la pompe est relativement égale à la vitesse de rotation de sortie du moteur hydraulique. Le mécanisme de verrouillage est actionné quand la pression d'huile de verrouillage est appliquée pour fermer le circuit hydraulique. Le mécanisme comporte un passage d'huile de contrôle du verrouillage fournissant la pression d'huile de verrouillage; l'ouverture de ce passage est contrôlée par un clapet. L'ouverture du passage est liée à l'inclinaison du plateau oscillant; le passage est fermé lorsque le plateau oscillant se trouve presque à la verticale.

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