Abstract: A differential includes a drive rotating body rotatable about a rotation axis, a planetary rotating body that is rotatable and is revolvable about the rotation axis, and a driven rotating body rotatable about the rotation axis. The planetary rotating body is made to mesh with each of the drive rotating body and the driven rotating body, so that a first speed reducer is constituted between the planetary rotating body and the drive rotating body and so that a second speed reducer is constituted between the planetary rotating body and the driven rotating body. The planetary rotating body is driven by an electric motor, and the drive rotating body is driven by a driving force from an engine. The intake camshaft is provided on the driven rotating body, and the exhaust camshaft is provided on the drive rotating body.

Abstract: According to an embodiment, an electronic device includes a heat source, a discharge path, a wall internal space, and a heat conductor. The discharge path is configured to guide a gas toward the outside of the device. The wall internal space is surrounded by walls, extends vertically, and is open to a space outside the device via an upper opening and a lower opening that are in different vertical positions. The heat conductor includes a heat absorber that is positioned in the discharge path and a heat dissipater that is positioned in the wall internal space.

Abstract: According to an embodiment, an electronic device includes a heat source, a discharge path, a wall internal space, and a heat conductor. The discharge path is configured to guide a gas toward the outside of the device. The wall internal space is surrounded by walls, extends vertically, and is open to a space outside the device via an upper opening and a lower opening that are in different vertical positions. The heat conductor includes a heat absorber that is positioned in the discharge path and a heat dissipater that is positioned in the wall internal space.