Controllable mechanical motor vehicle coolant pump

A controllable mechanical motor vehicle coolant pump comprising:

• a drive shaft which extends in an axial pump direction and which is configured to rotate and to be mechanically driven by an engine of a motor vehicle;
• a coolant pump wheel which is co-rotatably connected with the drive shaft and which is configured to pump a liquid coolant;
• a transverse housing surface which extends substantially transversely with respect to the drive shaft and which radially surrounds the drive shaft;
• a cylindrical inner slider support surface which radially surrounds the drive shaft and which is coaxial to the drive shaft;
• a first housing element which defines both the transverse housing surface and the cylindrical inner slider support surface;
• a separate second housing element which is arranged between the coolant pump wheel and the transverse housing surface;
• a control slider which is substantially pot-shaped and which is configured to be axially shiftable with respect to the coolant pump wheel so as to control an effective discharge flow cross-section of the coolant pump wheel, the control slider comprising,
• a substantially cylindrical slider side wall which is configured to radially surround the coolant pump wheel, and
• a slider bottom wall which extends substantially transversely with respect to the drive shaft and which is arranged axially between the coolant pump wheel and the transverse housing surface, the slider bottom wall comprising a radially inner bottom wall surface which is shiftably supported by the cylindrical inner slider support surface;
• a push-out pressure chamber which,
• is arranged between the slider bottom wall and the transverse housing surface,
• is defined at one axial side by the transverse housing surface and radially inwardly by the cylindrical inner slider support surface, and
• is configured to be hydraulically pressurized so as to generate a hydraulic push-out push force which pushes the slider bottom wall toward the coolant pump wheel;
• and
• a push-in pressure chamber which is located axially between the coolant pump wheel and the slider bottom wall, the push-in pressure chamber being configured to be hydraulically pressurized so as to generate a hydraulic push-in push force which pushes the slider bottom wall away from the coolant pump wheel,
• wherein,
• no contact interface exists between the first housing element and the separate second housing element at a radially inner side of the push-out pressure chamber, and
• a contact interface is arranged between the first housing element and the separate second housing element at the push-in pressure chamber.

A controllable mechanical motor vehicle coolant pump comprising:

• a drive shaft which extends in an axial pump direction and which is configured to rotate and to be mechanically driven by an engine of a motor vehicle;
• a coolant pump wheel which is co-rotatably connected with the drive shaft and which is configured to pump a liquid coolant;
• a transverse housing surface which extends substantially transversely with respect to the drive shaft and which radially surrounds the drive shaft;
• a cylindrical inner slider support surface which radially surrounds the drive shaft and which is coaxial to the drive shaft;
• a control slider which is substantially pot-shaped and which is configured to be axially shiftable with respect to the coolant pump wheel so as to control an effective discharge flow cross-section of the coolant pump wheel, the control slider comprising,
• a substantially cylindrical slider side wall which is configured to radially surround the coolant pump wheel, and
• a slider bottom wall which extends substantially transversely with respect to the drive shaft and which is arranged axially between the coolant pump wheel and the transverse housing surface, the slider bottom wall comprising a radially inner bottom wall surface which is shiftably supported by the cylindrical inner slider support surface;
• a push-out pressure chamber which,
• is arranged between the slider bottom wall and the transverse housing surface,
• is defined at one axial side by the transverse housing surface and radially inwardly by the cylindrical inner slider support surface, and
• is configured to be hydraulically pressurized so as to generate a hydraulic push-out push force which pushes the slider bottom wall toward the coolant pump wheel;
• and
• a cylindrical outer slider support surface,
• wherein,
• the transverse housing surface and the cylindrical inner slider support surface are both defined by a first housing element,
• the substantially cylindrical slider side wall comprises a radially outer side wall surface,
• the cylindrical outer slider support surface shiftably supports the radially outer side wall surface of the substantially cylindrical slider side wall, and
• the first housing element further defines the cylindrical outer slider support surface.