Pump device for a brake system of a motor vehicle, brake system

A brake system for a motor vehicle comprising:

• at least one brake circuit comprising at least one hydraulically actuable wheel brake;
• and
• at least one pump device configured to generate hydraulic pressure in the at least one brake circuit, the at least one pump device comprising:
• a housing;
• a pressure piston that defines a pressure chamber in the housing and is mounted in said housing in a longitudinally displaceable manner in such a way that a first hydraulic pressure in the pressure chamber is increased by a longitudinal movement of the pressure piston;
• a return spring assigned to the pressure piston;
• a non-return valve configured to hydraulically separate the pressure chamber from a pressure connection and to allow flow between the pressure chamber and the pressure connection only when the first hydraulic pressure in the pressure chamber is greater than a second hydraulic pressure in the pressure connection;
• and
• an electromagnetic actuator comprising an armature and an electrically energizable solenoid, the armature arranged on the pressure piston and the solenoid is arranged in and/or on the housing,
• wherein the pressure piston defines an axial through-channel having a first end and a second end, the axial through-channel opens out into the pressure chamber at the first end and is assigned to the non-return valve at the second end, and
• wherein the pressure piston has a pressure piston casing wall that defines at least one radial opening assigned to an intake connection and that, in at least one slide position of the pressure piston, hydraulically connects the intake connection to the pressure chamber, the radial opening being hydraulically connected to the intake connection in all slide positions of the pressure piston.

A pump device for a brake system of a motor vehicle, comprising:

• a housing;
• a pressure piston that defines a pressure chamber in the housing and is configured to produce hydraulic pressure, the pressure piston mounted in said housing in a longitudinally displaceable manner;
• a return spring assigned to the pressure piston;
• a non-return valve configured to hydraulically separate the pressure chamber from a pressure connection and to allow flow between the pressure chamber and the pressure connection only when a first hydraulic pressure in the pressure chamber is greater than a second hydraulic pressure in the pressure connection;
• and
• an electromagnetic actuator comprising an armature and an electrically energizable solenoid, the armature arranged on the pressure piston and the solenoid is arranged in and/or on the housing,
• wherein the pressure piston defines an axial through-channel having a first end and a second end, the axial through-channel opens out into the pressure chamber at the first end and is assigned to the non-return valve at the second end, and
• wherein the pressure piston includes an inlet valve that connects connect an intake connection to the pressure chamber, the inlet valve comprising a valve sleeve that partially defines the axial through-channel and is mounted in the pressure piston in a longitudinally displaceable manner.