| 主权项 |
1. A pump device for delivering a medium, the pump device comprising:
a pressure region (7, 21, 26); a vane pump (1, 17), having:
a stator (2, 19) having a cam contour (10), anda rotor (3), rotatable in the stator (2, 19) and having vanes (4, 5) extendable radially outward out of vane slots (8, 9) in the direction of the cam contour (10) of the stator (2, 19), and under-vane regions (11, 12, 23, 24), connected to the pressure region (7, 21, 26) of the pump device by a fluid duct (14, 27, 29) such that the under-vane regions (11, 12, 23, 24) are subjected to pressure to hydraulically extend the vanes (4, 5), wherein the under-vane regions are connected to one another; and a temperature-dependent hydraulic resistance (32) arranged in the fluid duct (27, 29), wherein the resistance value of the temperature-dependent hydraulic resistance (32) is greatest at low temperatures, the hydraulic resistance being configured such that maximum leakage losses occurring during operation of the under-vane regions produce a pressure difference below a minimum operating pressure of the pump device, the temperature dependence of the hydraulic resistance being sufficient to enable the under-vane regions to be decoupled from the pressure region during a starting of the pump device, wherein the fluid duct (14, 27, 29) is closed from the under-vane regions (11, 12, 23, 24) in the direction of the pressure region (7, 21, 26) at least during the starting of the vane pump (1, 17). |
