Hydrostatic transmission apparatus making improved braking possible

摘要

Hydrostatic transmission apparatus having an elementary motor with a feed enclosure and a discharge enclosure; a displacement selector suitable for taking up a bypass position, in which the feed and discharge enclosures are interconnected via a bypass link; and constriction means for constricting said bypass link. When the selector is in the bypass position, the constriction means can be activated to restrict the flow of fluid through the bypass link when the discharge pressure in the discharge enclosure exceeds a constriction threshold, said threshold being a function of a control pressure prevailing in a control chamber.

主权项

1. Hydrostatic transmission apparatus comprising at least a first elementary motor fed via a feed enclosure and from which fluid is discharged via a discharge enclosure, and a displacement selector, the displacement selector being suitable for taking up a bypass position, in which said feed enclosure is put into communication with said discharge enclosure via a bypass link, the apparatus further comprising constriction means for constricting said bypass link, and wherein, when the selector is in the bypass position, said constriction means are suitable for being activated to restrict the flow of fluid through the bypass link when a discharge pressure prevailing in the discharge enclosure exceeds a constriction threshold, said threshold being a function of a control pressure prevailing in a control chamber, and said constriction means are suitable for being deactivated to enable fluid to flow substantially freely through the bypass link when the discharge pressure is less than said constriction threshold.