Exhaust gas recirculation valve

An exhaust gas recirculation (EGR) valve, comprising:

• a valve housing having a flow path;
• a flap configured to open and close the flow path of the valve housing, the flap having a shaft and a hub configured to receive the shaft;
• an actuator configured to generate torque for rotating the flap;
• and
• a torque transmitting mechanism configured to transmit the torque of the actuator to the flap,
• wherein the torque transmitting mechanism includes a first lever connected to an output shaft of the actuator, a second lever connected to the shaft of the flap, and an intermediate link connecting the first lever and the second lever,
• wherein a first bushing and a second bushing are symmetrically provided at both ends of the hub,
• wherein a third bushing and a fourth bushing are provided on an internal surface of the valve housing, and
• wherein as the flap moves from a closed position in which the flow path of the valve housing is closed to an open position in which the flow path of the valve housing is open, the intermediate link is configured to move from an inclined position to a vertical position, and the first bushing is configured to move from a contacting position in which the first bushing contacts the third bushing to a separated position in which the first bushing is separated from the third bushing,
• wherein one end of the intermediate link is pivotally connected to one end of the first lever through a first pivot pin, and the other end of the intermediate link is pivotally connected to one end of the second lever through a second pivot pin,
• wherein one end of the intermediate link is provided with a first through hole through which the first pivot pin passes, and the other end of the intermediate link is provided with a second through hole through which the second pivot pin passes,
• wherein an axis of the first through hole intersects with an axis of the intermediate link at a predetermined angle, and an axis of the second through hole intersects with the axis of the intermediate link at a predetermined angle,
• wherein one end of the intermediate link becomes close to the second lever and the other end of the intermediate link becomes close to the first lever in a state in which the flap is located in a closed position, such that the axis of the intermediate link is inclined at a predetermined angle of inclination,
• wherein an inner diameter of the first through hole is larger than an outer diameter of the first pivot pin such that a gap is provided between the first through hole and the first pivot pin and contact between the first through hole and the first pivot pin as the intermediate link moves from the inclined position to the vertical position is reduced, and an inner diameter of the second through hole is larger than an outer diameter of the second pivot pin such that a gap is provided between the second through hole and the second pivot pin and contact between the second through hole and the second pivot pin as the intermediate link moves from the inclined position to the vertical position is reduced.