Pump unit with integrated piston pump and electric motor

A pump unit for pressurising a hydraulic actuating system in particular for pressurising an automotive actuating system, like a convertible roof system, boot lid, hood cover system or wheel suspension of a vehicle, wherein the pump unit comprises a pump housing including a pump chamber for housing a piston pump and wherein the pump unit further comprises an electric motor for driving the piston pump,

• wherein the electric motor comprises:
• a motor rotor wherein the motor rotor comprises a longitudinal motor rotor body including several magnets at an outer surface, wherein the motor rotor body defines an axial axis;
• a field coil which is positioned opposite the magnets of the motor rotor body for rotationally driving the motor rotor body;
• wherein the piston pump comprises:
• a pump stator which is stationarily positioned inside the pump chamber, which pump stator has a longitudinal stator body, in which the pump stator body includes at least two channels serving respectively as an inlet or outlet channel;
• a pump rotor positioned around the pump stator body, which pump rotor has a pump rotor body which is driveable in a rotational direction about the axial axis, wherein the pump rotor body includes several cylinder holes for each receiving a piston which is slidable with respect to the pump rotor body in a radial direction;
• an eccentric ring positioned around the pump rotor body in which the eccentric ring is eccentrically positioned at an eccentricity with respect to the pump rotor body to provide a pump capacity;
• wherein the motor rotor and the pump rotor are incorporated into a common rotor which is a one piece item including a motor and a pump rotor portion and wherein the common rotor is fully supported by the pump stator;
• wherein the pump stator is fixed to the pump housing as a cantilever.

A pump unit for pressurising a hydraulic actuating system, in particular for pressurising an automotive actuating system, like a convertible roof system, boot lid, hood cover system or wheel suspension of a vehicle, wherein the pump unit comprises a pump housing including a pump chamber for housing a piston pump and wherein the pump unit further comprises an electric motor for driving the piston pump;

• wherein the electric motor comprises:
• a motor rotor, wherein the motor rotor comprises a longitudinal motor rotor body including several magnets at an outer surface, wherein the motor rotor body defines an axial axis;
• a field coil which is positioned opposite the magnets of the motor rotor body for rotationally driving the motor rotor body;
• wherein the piston pump comprises:
• a pump stator which is stationary positioned inside the pump chamber, which pump stator has a longitudinal stator body, in which the pump stator body includes at least two channels serving respectively as an inlet or outlet channel;
• a pump rotor positioned around the pump stator body, which pump rotor has a pump rotor body which is driveable in a rotational direction about the axial axis, wherein the pump rotor body includes several cylinder holes for each receiving a piston which is slidable with respect to the pump rotor body in a radial direction;
• an eccentric ring positioned around the pump rotor body, in which the eccentric ring is eccentrically positioned at an eccentricity with respect to the pump rotor body to provide a pump capacity;
• characterised in that, the motor rotor and the pump rotor are incorporated into a common rotor which is a one piece item including a motor and a pump rotor portion and wherein the common rotor is fully supported by the pump stator and the pump stator extends through the rotor.

A pump unit for pressurising a hydraulic actuating system, in particular for pressurising an automotive actuating system, like a convertible roof system, boot lid, hood cover system or wheel suspension of a vehicle, wherein the pump unit comprises a pump housing including a pump chamber for housing a piston pump and wherein the pump unit further comprises an electric motor for driving the piston pump;

• wherein the electric motor comprises:
• a motor rotor, wherein the motor rotor comprises a longitudinal motor rotor body including several magnets at an outer surface, wherein the motor rotor body defines an axial axis;
• a field coil which is positioned opposite the magnets of the motor rotor body for rotationally driving the motor rotor body;
• wherein the piston pump comprises:
• a pump stator which is stationary positioned inside the pump chamber, which pump stator has an elongated stator body, which is beam shaped in which the pump stator body includes at least two channels serving respectively as an inlet or outlet channel;
• a pump rotor positioned around the pump stator body, which pump rotor has a pump rotor body which is driveable in a rotational direction about the axial axis, wherein the pump rotor body includes several cylinder holes for each receiving a piston which is slidable with respect to the pump rotor body in a radial direction;
• an eccentric ring positioned around the pump rotor body, in which the eccentric ring is eccentrically positioned at an eccentricity with respect to the pump rotor body to provide a pump capacity;
• wherein the motor rotor and the pump rotor are incorporated into a common rotor which is a one piece item including a motor and a pump rotor portion and wherein the common rotor is fully supported by the pump stator.

A pump unit for pressurising a hydraulic actuating system, in particular for pressurising an automotive actuating system, like a convertible roof system boot lid, hood cover system or wheel suspension of a vehicle, wherein the pump unit comprises a pump housing including a pump chamber for housing a piston pump and wherein the pump unit further comprises an electric motor for driving the piston pump;

• wherein the electric motor comprises:
• a motor rotor, wherein the motor rotor comprises a longitudinal motor rotor body including several magnets at an outer surface, wherein the motor rotor body defines an axial axis;
• a field coil which is positioned opposite the magnets of the motor rotor body for rotationally driving the motor rotor body;
• wherein the piston pump comprises:
• a pump stator which is stationary positioned inside the pump chamber, which pump stator has a longitudinal stator body, in which the pump stator body includes at least two channels serving respectively as an inlet or outlet channel;
• a pump rotor positioned around the pump stator body, which pump rotor has a pump rotor body which is driveable in a rotational direction about the axial axis, wherein the pump rotor body includes several cylinder holes for each receiving a piston which is slidable with respect to the pump rotor body in a radial direction;
• an eccentric ring positioned around the pump rotor body, in which the eccentric ring is eccentrically positioned at an eccentricity with respect to the pump rotor body to provide a pump capacity;
• characterised in that, the motor rotor and the pump rotor are incorporated into a common rotor which is a one piece item including a motor and a pump rotor portion and wherein the common rotor is fully supported by the pump stator and the common rotor is positioned inside said pump chamber.