Patent ID: 7856819

Claim:
A hydraulic circuit ( 20 ) for a public works vehicle, comprising: a hydraulic pump ( 21 ) having an outlet and driven by a combustion engine ( 22 ) using a “load sensing” logic; a hydraulic motor ( 10 ) with a boost port and responsible for moving a part ( 8 ) of the vehicle, and also a set of hydraulic actuators ( 12 - 14 ); a distributor ( 29 ) having a return line and being responsible for a controlled supply of hydraulic fluid to said hydraulic actuators ( 12 - 14 ); a cooling device ( 45 ) for the fluid circulating in said circuit; a pressure-reducing device ( 33 ) connected to the outlet of said hydraulic pump ( 21 ) and delivering a first pressure level, said pressure-reducing device ( 33 ) being connected to the boost port ( 34 ) of said hydraulic motor ( 10 ); and an assembly connecting a nonreturn valve ( 40 ) and a calibrated restriction ( 41 ) in parallel, said assembly being connected downstream of said boost port ( 34 ) of the hydraulic motor and the return line ( 36 ) of said distributor ( 29 ) and being located upstream of said cooling device ( 45 ).