The present invention relates to a planetary gear type transmission, the frame and the both ends are fixed to one side of the frame, and the first passage hole formed on the outer surface side, the fixed shaft having a receiving space therein, and the fixing shaft receiving space in a pivotally mounted, being the first shift groove formed along the outer periphery on the outer surface side, wherein the transmission shaft is the first shift groove in the axial direction on one side curved at least one transmission interval of the formation and, on one side of the shift shaft the connected to be moved back and forth in the fixed shaft axis direction when the the rotation force providing means for providing a rotating force to said speed change shaft, one end being inserted into the first shift groove through the first through hole, the rotation of the shift shaft the first cam member and the one side is supported at one side of the fixed shaft, the other side of the first cam member is supported on one side of the first cam member and the elastic pressure of the elastic member, the fixed shaft This is inserted into the hollow formed of a plurality of each gear and the sun gear, and a gear formed on the outer peripheral surface of the sun gear and the gear coupling formed in the outer surface and the outer surface planet gears and the inner surface is multi-stage comprising an internal gear which is gear coupled to the planet gears gear assembly and the coupling to be one which the first is supported at one side of the cam member, wherein the fixed shaft axis direction of the outer surface at a position corresponding to the sun gear is provided so as to be movable front and rear gear combination with the gear of the sun gear formed on the outer surface It is released from the position and the engaged position provides a planetary gear type speed change device comprising: a shift member to move between the release position that is engaged with the sun gear release.
In accordance with the present invention as described above, in this case, the rotating and also to the transmission member and the sun gear is the gear combination is a combination of the sun gear and the shifting member shifting efficiency greatly improved by allowing be made accurately by making a direct connection type as well as high-speed transmission shaft can be prevented, even if according to the used for the rotation is required device a large load is applied to the shift member to which the coupling state of the transmission member and the sun gear release, the effect capable of preventing in advance that the transmission member is broken or damaged is.