Patent ID: 7614609

Claim:
A winch, comprising: a drum defining an axial central hole and being rotatable about a longitudinal axis of the axial central hole; a motor that is longitudinally disposed at an end of the drum; and a power transmission device that is longitudinally disposed at the other end of the drum and operatively connected to the motor and the drum respectively, wherein the power transmission device includes a casing mounted at the other end of the drum, a transmission gear shaft extending longitudinally in the axial central hole of the drum, a proximal end of the transmission gear shaft being connected to the motor and a distal end thereof being provided with a transmission gear and extended into the casing; a planetary mechanism assembly having first and second planetary carriers that are disposed in the casing and rotatable about the longitudinal axis, first to third planetary gears that are rotatably supported on the first and second planetary carriers via first to the third planetary gear shafts and engaged with the transmission gear, respectively, an annular gear fixed in the casing and engaged with the first to third planetary gears respectively, and a power output member that is disposed in the casing, rotatable about the longitudinal axis and formed with an input gear portion and an output gear portion, the input gear portion engages with the first to third planetary gears respectively, and the output gear portion engages with the drum.