Valve device

A valve device that increases or decreases a flow rate of EGR gas, the valve device comprising:

• a housing that includes
• a first upstream passage into which the EGR gas cooled by an EGR cooler flows,
• a second upstream passage into which the EGR gas that bypasses the EGR cooler flows,
• a junction connected to each of a gas-flow downstream of the first upstream passage and a gas-flow downstream of the second upstream passage, and
• a downstream passage connected to the first upstream passage and the second upstream passage via the junction;
• a bypass valve body that is provided in the second upstream passage and opens and closes the second upstream passage;
• an EGR valve body that is provided in the downstream passage and rotates around an EGR valve axis to open and close the downstream passage;
• a motor that rotationally drives the EGR valve body;
• and
• an interlocking portion that interlocks the bypass valve body with a rotational operation of the EGR valve body, wherein
• the motor and the bypass valve body are disposed opposite to each other with the junction between the motor and the bypass valve body,
• wherein
• the bypass valve body rotates around a bypass valve axis to open and close the second upstream passage,
• the interlocking portion includes a cam that rotates with the EGR valve body and has a cam track, and a driven rotating portion that rotates with the bypass valve body and has a cam follower,
• the driven rotating portion rotates in an interlocking manner with a rotational operation of the cam while causing the cam follower to follow the cam track,
• the cam is fixed to an EGR valve shaft to integrally rotate with the EGR valve body around the EGR valve axis, and
• the cam includes a cam through-hole.