Gear hinge device for portable apparatus

A gear hinge device for connecting first and second housings of a portable terminal in such a manner that the first and second housings can be rotated about first and second hinge axes, respectively, wherein the gear hinge device comprises:

• a first driving unit comprising a first driving cam gear that is rotated about the first hinge axis, and a first auxiliary gear;
• and
• a second driving unit comprising a second driving cam gear that is engaged with the first driving cam gear and rotated about the second hinge axis that is parallel to the first hinge axis, and a second auxiliary gear,
• wherein each of the first driving cam gear, the first auxiliary, the second driving cam gear and the second auxiliary gear is provided with a set of gear teeth, and
• wherein the first and second driving cam gears are arranged coaxially to the first and second auxiliary gears, respectively, and the first and second auxiliary gears are arranged to be engaged with each other.