Abstract: An input synthesis apparatus according to the present invention includes: a first input unit which provides first rotational force; a second input unit which provides second rotational force equal to or different from the first rotational force; a gear unit which is engaged with the first input unit and the second input unit and synthesizes the first rotational force and the second rotational force; and an output unit which outputs resultant force of the first rotational force and the second rotational force, in which the gear unit sums up speeds or torque of the first rotational force and the second rotational force based on whether a rotation direction of the first input unit and a rotation direction of the second input unit are identical to each other.

Abstract: A gear system for combining inputs is provided. The gear system can includes: a first power source that generates a rotational force; a second power source that generates a rotational force identical to or different from the rotational force of the first power source; a third power source that generates a rotational force identical or different from the rotational forces of the first power source and the second power source; and a gear unit that generates a resultant output by combining the rotational forces from the first power source to the third power source, in which the gear unit generates a resultant output by combining torque of any two of the first power source to the third power source and combining a speed of the other power source. According to this configuration, it is possible to generate various outputs from various power sources having the same or different characteristics.

Abstract: Disclosed are a planetary gear system using tow input characteristics, a gear module thereof, and a method for controlling the same, which exhibit an effect of the gear shift using two motor characteristics, and also a gear module thereof, and a method for controlling the same. A gear system including a first gear unit; a second gear unit that rotates to mesh with the first gear unit; a third gear unit that rotates to mesh with at least one of the first gear unit and the second gear unit; and a driving source that generates a driving force. Two gear units of the first to third gear units serve as input parts to which driving forces from the driving source are transmitted, respectively, and the rest one gear unit serves as an output part from which a resultant force obtained by combining the driving forces is output.