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1. A valve drive apparatus installed to a supercharger that includes a first valve, which is rotatable about an axis of a first valve shaft, and a second valve, which is rotatable about an axis of a second valve shaft, the valve drive apparatus being configured to drive the first valve and the second valve, the valve drive apparatus comprising:
an actuator that includes an output shaft, which is rotatable about an axis of the output shaft; a first drive lever that includes a first drive lever shaft, which is rotatable integrally with the output shaft, wherein an axis of the first drive lever shaft is parallel to the axis of the output shaft and is placed at a location that is spaced from the axis of the output shaft by a first predetermined distance; a second drive lever that includes a second drive lever shaft, which is rotatable relative to the output shaft, wherein an axis of the second drive lever shaft is parallel to the axis of the output shaft and is placed at a location, which is spaced from the axis of the output shaft by a second predetermined distance; a first valve lever that includes a first valve lever shaft, which is rotatable integrally with the first valve shaft, wherein an axis of the first valve lever shaft is parallel to the axis of the first valve shaft and is placed at a location, which is spaced from the axis of the first valve shaft by a third predetermined distance; a second valve lever that includes a second valve lever shaft, which is rotatable integrally with the second valve shaft, wherein an axis of the second valve lever shaft is parallel to the axis of the second valve shaft and is placed at a location, which is spaced from the axis of the second valve shaft by a fourth predetermined distance; a first rod that is rotatably connected to the first drive lever shaft at one end part of the first rod and is rotatably connected to the first valve lever shaft at another end part of the first rod, which is opposite from the one end part of the first rod; a second rod that is rotatably connected to the second drive lever shaft at one end part of the second rod and is rotatably connected to the second valve lever shaft at another end part of the second rod, which is opposite from the one end part of the second rod; a first predetermined shape portion that is formed at a corresponding location of the first drive lever, which is spaced from the axis of the output shaft by a predetermined distance; a second predetermined shape portion that is formed in the second drive lever and is contactable with the first predetermined shape portion; and an urging device that is placed between the actuator and the second drive lever and urges the second drive lever in a predetermined direction, which coincides with a closing direction of the second valve and an approaching direction of the second predetermined shape portion toward the first predetermined shape portion. |
