CONTROLLABLE COOLANT PUMP HAVING A FLUIDIC ACTUATOR

摘要

A controllable coolant pump (10) for a cooling circuit of an internal combustion engine having a pump housing (12) with an inner bore (14), in which a shaft (20) which can be driven via a pulley is mounted rotatably by way of a first bearing (16) and a second bearing (18), wherein the shaft (20) is configured at least partially as a hollow shaft and has a longitudinal axis, wherein a rotor is fastened to one end of the shaft (20), which rotor has an idler pulley and vanes which project into a suction chamber, wherein, by way of the rotation of the rotor, water can be sucked via a suction connector of the pump housing (12) into the suction chamber and can be delivered via the vanes into an annular channel of the pump housing (12), wherein the idler pulley can be displaced axially via a push rod (34) which is connected to an actuator. According to the invention, the actuator forms a fluidic actuator, wherein the fluidic actuator has a first pressure chamber (28) which can be loaded with pressure by way of a fluid and a second pressure chamber (30) which can be loaded with pressure by way of a fluid. The weight and the installation space requirement of the controllable coolant pump (10) can be reduced by the use of a fluidic actuator. Moreover, the energy requirement of the controllable coolant pump (10) can be lowered.