Exhaust gas heat exchanger

An exhaust gas heat exchanger comprising:

• a tube bundle composed of exhaust-gas tubes,
• a bypass passage in a common housing, and
• an exhaust gas valve comprising a flexurally rigid, moveable closure member,
• wherein the tube bundle is arranged in a first space, through which liquid coolant flows, and the bypass passage is arranged in a second, separate space,
• wherein the tube bundle and the bypass passage open into a common exhaust gas inlet region and a common exhaust gas outlet region,
• wherein the exhaust gas valve is arranged in the inlet region and is actuated by an actuating drive and guides the flow of exhaust gas through the tube bundle or the bypass passage,
• wherein the closure member is designed as a pivot flap with an approximately centrally arranged pivot axle and two opposite sealing edges,
• wherein a partition with a concave sealing surface facing the pivot flap is arranged between the pivot axle and the inlet cross sections of the tube bundle and of the bypass passage, and
• wherein the downstream sealing edge slides along the sealing surface over the pivoting range.

An exhaust gas heat exchanger comprising:

• a tube bundle composed of exhaust-gas tubes,
• a bypass passage in a common housing, and
• an exhaust gas valve comprising a flexurally rigid, moveable closure member,
• wherein the tube bundle is arranged in a first space, through which liquid coolant flows, and the bypass passage is arranged in a second, separate space,
• wherein the tube bundle and the bypass passage open into a common exhaust gas inlet region and a common exhaust gas outlet region,
• wherein the exhaust gas valve is arranged in the inlet region and is actuated by an actuating drive and guides the flow of exhaust gas through the tube bundle or the bypass passage,
• wherein the closure member is designed as an angle flap with two limbs fixedly arranged approximately at right angles to one another and having a common apex, at which the closure member is mounted for rotation about a pivot axle, and
• wherein one limb selectively pivots about the pivot axle to respectively cover an inlet cross section of the tube bundle or the bypass passage while the other limb is oriented parallel to the exhaust gas flow (A).

An exhaust gas heat exchanger comprising:

• a tube bundle composed of exhaust-gas tubes,
• a bypass passage in a common housing, and
• an exhaust gas valve comprising a flexurally rigid, moveable closure member,
• wherein the tube bundle is arranged in a first space, through which liquid coolant flows, and the bypass passage is arranged in a second, separate space,
• wherein the tube bundle and the bypass passage open into a common exhaust gas inlet region and a common exhaust gas outlet region,
• wherein the exhaust gas valve is arranged in the inlet region and is actuated by an actuating drive and guides the flow of exhaust gas through the tube bundle or the bypass passage, wherein the closure member is designed as a plate slide that can move transversely with respect to the exhaust gas direction of flow (A) and has a cross-sectional area which approximately corresponds to half the cross section of flow.