Bevel gear load balance in a hydrostatic transmission

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

Patent

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F16H 39/00 (2006.01) B60K 17/10 (2006.01) F16H 39/18 (2006.01)

Patent

CA 2114392

An apparatus for balancing and supporting various loads exerted on the pump cylinder block and associated bevel gear in a radial piston type hydraulic transmission for assuring concentric rotation about the pintle during operation. A hydraulic pressure pad, acting as a hydraulic piston, is located on the outer surface of the pintle at least partially underneath the pump cylinder block hub portion for counteracting the loads exerted against the pump cylinder block and associated bevel gear. A groove circumferentially disposed in the outer surface of the pintle supplies oil to the pressure pad from a bore disposed in the groove and in communication with the high pressure passage of the pintle. The pressure pad is preferably disposed 90° from the input shaft and associated input bevel gear. Additional grooving on the outside circumferential surface of the pintle provides lubrication between the rotating cylinder blocks of the pump and motor, and the pintle.

Dispositif d équilibrage et de support de différentes charges exercées sur le bloc-cylindres d'une pompe et sur la roue conique correspondante d'une transmission hydraulique à pistons radiaux de façon à assurer une rotation concentrique autour d'un axe pendant le fonctionnement. Une plaque de pression hydraulique, agissant comme un piston hydraulique, est située sur la surface extérieure de l'axe au moins en partie sous la partie centrale du bloc-cylindres de la pompe de façon à neutraliser les forces exercées contre le bloc-cylindres et la roue conique correspondante. Une rainure circulaire placée sur la surface extérieure de l'axe assure la distribution d'huile sur la plaque de pression depuis un alésage placé dans la rainure et en communication avec la plaque de haute pression de l'axe. La plaque de pression est, de préférence, placée à 90.degrés. Par rapport à l'arbre d'entrée et la roue conique d'entrée correspondante. Une rainure supplémentaire située sur la surface circulaire extérieure de l'axe assure une lubrification entre les blocs-cylindres rotatifs de la pompe et du moteur, et l'axe.

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