Underwater robotic device

An underwater robotic device movable in water, comprising:

• a housing unit including a base seat and an upper cover in liquid-tight engagement with said base seat;
• a control unit disposed within said housing unit, and including a circuit module and a center-of-gravity transferring module which is electronically connected with said circuit module, said center-of-gravity transferring module having a weight member which is movable relative to said base seat in a front-rear direction, and a transfer driving mechanism which is coupled with said weight member to drive movement of said weight member in the front-rear direction so as to vary a position of a center of gravity of said underwater robotic device and to control downward and upward moving directions of said underwater robotic device in the water;
• and
• a propelling unit connected with said housing unit and electronically connected with said control unit to produce a propelling force to move said underwater robotic device forward in the water,
• wherein said base seat has a front housing which defines a front compartment therein, and two front mounting cassettes which are connected with and extend from said front housing in the front-rear direction, and
• wherein said propelling unit includes two front limb mechanisms which are connected with said front housing, said front housing having two front wire passages each of which extends to intercommunicate said front compartment and a respective one of said front mounting cassettes, and
• each of said front limb mechanisms including a front limb motor which is mounted in the respective one of said front mounting cassettes and which has a front motor part that projects forwardly from said respective front mounting cassette, and a front waterproof cover which is in liquid-tight engagement with said respective front mounting cassette and which covers said front motor part of said front limb motor, a front limb rotating axle which is in liquid-tight engagement with said front waterproof cover, which is coupled with said front limb motor and which has a front axle part that projects forwardly of said front waterproof cover, and a front limb module which is connected with said front limb rotating axle to be rotated therewith, wherein said front limb motor is electronically connected with said control unit through a wire which extends through a respective one of said front wire passages, and is controlled and operated to drive rotation of said front limb rotating axle about a front axis.