Abstract: A hydraulic pressure generator having a body (1) with a first bore (11) therein for receiving a cylinder (21) of a piston assembly (2) to define a pressure chamber (12). The cylinder (21) has a second bore (211) for receiving an auxiliary piston (22) which defines a variable volume compensation chamber (23). The compensation chamber encloses a deformable member (5) which is adapted to exert an elastic force between the auxiliary piston (22) and a closed end (210) of cylinder (21). The compensation chamber (23) communicates with the pressure chamber (12) through a restriction (221) formed in a longitudinal duct (222) of the auxiliary piston (22). A sealing member (4) borne by a portion (222) of the auxiliary piston (22) closes the pressure chamber (12) such that the elastomeric member (5) dampens pressure differences between the pressure chamber (12) and compensation chamber (23).

Abstract: A rotary pump having a stator (1) pierced with a housing (11) delimited by a cylindrical sidewall (110). A cylindrical rotor (2) located tangentially inside of the housing (11) off-center to an axis (X). The cylindrical rotor (2) is driven in rotation about the axis (X). A vane which diametrally passes through the rotor (2) has first and second opposite edges (31,32). The first and second opposite edges (31,32) bear against the sidewall (110) and are separated from one another by a distance subjected to variations during rotation of the rotor (2). The vane (3) is made of a thin sheet of material which offers elastic resistance to bending. The thin sheet has an undulation part (33,34) which absorbs such variations in distance experienced by the first and second opposite edges (31,32) of the vane (3).