Audi Ag

Michael Staiger

Dieter Lachner

Steffen Triebe

Lars Helling

The invention relates to a fail-safe rotary actuator () for a coolant circuit, in particular for a coolant circuit of an internal combustion engine () having a plurality of sub-circuits () and (), includes a coolant delivery pump () for circulating the coolant within the coolant circuit, and having a rotary-slide housing () which has a plurality of housing pass-through openings () and () and in which at least one rotary slide () having at least one rotary slide pass-through opening () and () is rotatably supported, wherein the housing pass-through openings () and/or () are fluidly connected to at least one sub-circuit () and/or (), and can be brought into at least partial coincidence with the rotary slide pass-through openings () and/or () by a rotary motion of the rotary slide (), wherein a thermostat valve () opens a flow path running parallel to the rotary slide () from one of the sub-circuits () or () to the coolant delivery pump (), when a temperature limit of the coolant is exceeded.

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Brackenheim, Germany

Michael Staiger