Audi Ag

Dieter Lachner

Steffen Triebe

Markus Störmer

Stephan Adam

Lars Helling

Michael Staiger

Stefan Rank

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.

Rotary slide valve with a thermostatic bypass

Coolant circuit, in particular a coolant circuit having a plurality of sub-circuitsof an internal combustion engineincludes a primary cooling circuitand a heating circuitas well as a coolant delivery pumpdisposed on a rotary actuator, with the rotary actuatorhaving a rotary-slide housingwith several portsthrough which coolant can flow, and a first and at least one second rotary slideandwhich are rotatably supported in the rotary-slide housingand have each at least one rotary-slide pass-through openingforming a flow path, wherein the portscan be brought into at least partial coincidence with the rotary-slide pass-through openingsby a rotary motion of the respective rotary slideand/or), wherein a first branchof the primary cooling circuitleads from the internal combustion enginevia a main radiatorto a main radiator portof the first rotary slide and can be controlled by the first rotary slide, and that a second branchof the primary cooling circuitleads from an outletof the coolant delivery pumpto the internal combustion engineand can be controlled by the second rotary slide

Coolant circuit

Growing community of inventors

Gaimersheim, Germany

Dieter Lachner