Power train device for electric vehicle

A power train device for an electric vehicle, the power train device comprising:

• a first planetary gear set comprising a first sun gear coupled to an input shaft connected to a drive motor, a first ring gear surrounding the first sun gear, a first planet gear configured to engage with the first sun gear and the first ring gear between the first sun gear and the first ring gear, and a first carrier configured to support the first planet gear so that the first planet gear is rotatable;
• and
• a sleeve having an inner-diameter portion having a first engagement part thereon, the first engagement part being configured to:
• engage with a third engagement part disposed on an outer-diameter portion of the first ring gear;
• move along an axial direction of the input shaft while engaging with the third engagement part toward a casing to implement a first shift operation for a first speed range;
• and
• move along the axial direction of the input shaft while engaging with the third engagement part toward the first carrier to implement a second shift operation for a second speed range,
• wherein a second engagement part is disposed on one surface of the sleeve, a fourth engagement part is disposed in the casing, a fifth engagement part is disposed on one surface of the first carrier, and a sixth engagement part is disposed on another surface of the sleeve facing the fifth engagement part,
• wherein the second engagement part and the fourth engagement part have first radial dog- type teeth facing one another, and the fifth engagement part and the sixth engagement part have second radial dog-type teeth facing one another.