Neutral flow by-pass valve for hydrostatic transmission

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

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Details

F16H 61/42 (2006.01) F04B 49/12 (2006.01) B60K 17/10 (2006.01)

Patent

CA 2225700

A neutral by-pass for hydraulic fluid in a hydrostatic transmission is provided by an essentially closed conduit comprising a pair of bores and a channel communicating the pair of bores, all formed in the cam ring of the transmission.When the neutral point is attained, the bores will be communicated with oil dampening pistons in communication with the hydraulic fluid supply passages and the fluid pressure between the passages will be equalized. This will operate from either the forward or reverse direction. As the cam ring is angularly moved, essentially closed conduit is moved away from the dampening pistons, so there can be no fluid flow therethrough. When this occurs, all fluid flow goes to the motor rotor, causing output rotation.

Cette invention concerne une soupape de dérivation pour la mise au neutre d'une transmission hydrostatique qui se compose essentiellement d'un conduit fermé comprenant une paire d'alésages et un passage reliant les deux alésages, le circuit tout entier étant ménagé dans la couronne à cames de la transmission. Lorsque le point neutre est atteint, les alésages sont mis en communication avec des pistons amortisseurs eux-mêmes en communication avec les canaux d'alimentation en fluide hydraulique et servant à équilibrer les pressions dans les différents conduits. La soupape de dérivation peut être commandée aussi bien en marche avant qu'en marche arrière. Lorsque la couronne à cames est tourné, le conduit essentiellement fermé est éloigné des pistons amortisseurs, interdisant toute circulation de fluide par cette voie. Dans cet état de choses, tout le fluide est dirigé vers le rotor du moteur.

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