Cooler of an exhaust gas recirculation system and exhaust gas recirculation system including one such cooler

A cooler of an exhaust gas recirculating system comprising

• a housing including coolant inflow and outflow ports for cooling fluid,
• at least one bypass pipe for hot exhaust gas, said bypass pipe being arranged within said housing, wherein said cooler comprises a sole inflow and/or outflow for said exhaust to be recirculated as well as an actuator for closing off at least said bypass pipe, said bypass pipe is a double-walled pipe, and
• a vacuum is formed between both walls of said double-walled pipe to minimize cooling of the hot bypass exhaust gas flowing through the bypass pipe.

A cooler of an exhaust gas recirculating system comprising

• a housing including coolant inflow and outflow ports for cooling fluid,
• at least one bypass pipe for hot exhaust gas, said bypass pipe being arranged within said housing, wherein said cooler comprises a sole inflow for said exhaust gas to be recirculated and said bypass pipe as viewed flow-technically is located in the extension of said inflow, said bypass pipe is a double-walled pipe, and
• a vacuum is formed between both walls of said double-walled pipe to minimize cooling of the hot exhaust gas flowing through the bypass pipe.