Patent ID: 8820065

Claim:
A hydrostatic transmission closed circuit, comprising a fluid tank ( 50 ), a hydraulic pump ( 12 ; 212 ), a first engine assembly ( 20 ; 220 ) and a second engine assembly ( 30 , 40 ; 230 ), said first and second engine assemblies ( 30 , 40 ; 230 ), each comprising at least one hydraulic engine, said first engine assembly ( 20 ; 220 ) being connected to the hydraulic pump ( 12 ; 212 ) by a supply line ( 102 ; 202 ), and being mounted in series with said second engine assembly ( 30 , 40 ; 230 ) via a series line ( 104 ; 204 ), said second engine assembly ( 30 , 40 ; 230 ) being connected to the hydraulic pump ( 12 ; 212 ) by a return line ( 106 ; 206 ), a booster pump ( 14 ; 214 ) which removes fluid in the fluid tank ( 50 ) and boosts the closed circuit at the level of the series line ( 104 ; 204 ), an exchange unit ( 60 ; 260 ) connected to the closed circuit, and which extracts therefrom a volume of fluid injected by the booster pump ( 14 ; 214 ), said circuit also comprising a supplementary boosting line ( 150 ; 350 ) which removes fluid at the outlet of the exchange unit ( 60 ; 260 ) and boosts the hydrostatic transmission circuit at the level of the series line ( 104 ; 204 ).