Patent ID: 8517156

Claim:
A clutch actuating apparatus for a transmission, comprising: an electric unit that generates rotational force; a decelerating unit coupled to the electric unit and increasing the rotational force of the electric unit; a straight-converting unit that converts the rotational force increased by the decelerating unit into a straight motion force; a push rod that is moved straight by the straight motion force of the straight-converting unit and makes an operational stroke to selectively engage a clutch; a supplement force supplying unit engaging with the push rod to increase the straight movement force to the push rod or to remove the increased straight movement force from the push rod when the push rod engages or disengages the clutch; and a rod locating unit coupled to the push rod and changing a relative position of the push rod to the straight-converting unit; wherein the electric unit includes an electric motor, the decelerating unit includes a worm connected to a rotary shaft of the electric motor and a worm wheel engaged with the worm, wherein the worm wheel is rotatably coupled to a body housing, the straight-converting unit includes a driving pinion integrally formed with the worm wheel and a reciprocating member having a rack engaged with the driving pinion to convert a rotation of the driving pinion to a straight motion of the push rod, and the electric motor is connected to and controlled by a controller that receives output shaft velocity information of the transmission, and wherein the rod locating unit includes: a rod block fixed to the reciprocating member and receiving the push rod therein to guide the push rod to slide straight; a compensating pinion rotatably coupled to the rod block and engaged with a rack of the push rod; and a clutch rotating unit that allows for one-way rotation of the compensating pinion by a predetermined angle in accordance with a straight motion of the rod block.