Exhaust heat recovery device including engagement portion configured to rotate valve

An exhaust heat recovery device comprising:

• an exhaust pipe that has a tubular shape and that allows an exhaust gas from an internal combustion engine to be guided downstream;
• a shell member of a tubular shape that covers an outer side of the exhaust pipe;
• a heat exchange portion arranged between the exhaust pipe and the shell member, the heat exchange portion comprising a heat exchanger that performs heat exchange between (i) the exhaust gas as a high-temperature fluid and (ii) a low-temperature fluid flowing within the heat exchanger;
• an inflow portion comprising an inflow path through which the exhaust gas from the exhaust pipe flows to the heat exchange portion;
• a valve arranged downstream of the inflow portion along a flow path of the exhaust gas in the exhaust pipe, the valve opening and closing the exhaust pipe;
• a driving portion that generates a driving force for driving the valve;
• and
• a transmitting portion that transmits the driving force generated by the driving portion to the valve,
• wherein the driving portion comprises:
• an expansion portion that expands when an external electrical signal is inputted to the driving portion;
• and
• a linearly moving portion that extends according to expansion of the expansion portion,
• wherein the transmitting portion comprises:
• an engagement portion that is fixed to a shaft of the valve and that engages with the linearly moving portion;
• and
• a torsion spring that applies a biasing force to the valve, and
• wherein at least one end of the torsion spring is directed inward in a radial direction thereof,
• wherein the engagement portion comprises an engagement part having an arc-like shape,
• wherein the linearly moving portion comprises a piston, and
• wherein, in the piston, a seating face configured to engage the engagement part of the engagement portion comprises an arc-like concave shape.