Automatic transmission

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

Patent

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Details

F16H 61/44 (2006.01)

Patent

CA 2398534

Automatic transmission, comprising at least one primary hydraulic pump (1) arranged to be powered by a motor, said primary pump (1) being arranged to power a number of at least two secondary hydraulic pumps (21-2n) which are mechanically connected to an outgoing propeller shaft (6), the secondary hydraulic pumps being arranged for active powering of said outgoing propeller shaft when the hydraulic pressure caused by the primary pump in a closed room (A) between the primary pump and the secondary pumps, reaches predetermined levels which are different for the various secondary pumps (21, 22 and ... 2n respectively). Each of the secondary hydraulic pumps (21 - 2n) is preferably closed by means of a mechanical spring resistance from a coil spring (213 - 2n3) against a valve (212 - 2n2) which abuts a valve seat, until the pressure from the primary pump (1) gets sufficiently high to overcome the resistance from said coil spring, the secondary hydraulic pumps (21 - 2n) having individually adapted springs (213 - 2n3) which open at mutually different pressures.

La présente invention concerne une transmission automatique qui comprend au moins une pompe hydraulique principale (1) agencée de façon à être énergisée par un moteur, cette pompe (1) principale étant agencée de façon à énergiser au moins deux pompes (2¿1?-2¿n?) hydrauliques secondaires mécaniquement connectées à un arbre (6) d'hélice. Ces pompes hydrauliques secondaires sont agencées de façon à énergiser activement ce départ d'arbre d'hélice lorsque la pression hydraulique induite par la pompe principale dans une chambre fermée (A) située entre cette pompe principale et les pompes secondaires, atteint des niveaux prédéterminés qui sont différents selon les diverses pompes secondaires (2¿1?,2¿2? et 2¿n? respectivement). Chacune de ses pompes (2¿1?-2¿n?) hydrauliques secondaires est de préférence fermée par la charge ressort mécanique d'un ressort enroulé (2¿13?-2¿n3?) agissant contre une soupape (2¿12?-2¿n2?) qui vient toucher un siège de soupape, jusqu'à ce que la pression en provenance de la pompe primaire (1) devienne suffisamment élevée pour vaincre la charge de ce ressort enroulé, ces pompes (2¿1?-2¿n?) hydrauliques secondaires possédant des ressorts individuellement adaptés (2¿13?-2¿n3?) qui s'ouvrent à des pressions différentes les unes des autres.

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