Planetary gear train of automatic transmission for vehicles

A planetary gear train of an automatic transmission for a vehicle comprising:

• an input shaft receiving torque;
• an output shaft disposed in parallel with and apart from the input shaft;
• a first planetary gear set including a first sun gear, a first planet carrier, and a first ring gear as rotation elements thereof;
• a second planetary gear set including a second sun gear, a second planet carrier, and a second ring gear as rotation elements thereof and disposed adjacent to the first planetary gear set;
• a first rotation shaft directly connected to the second sun gear and selectively connected to the input shaft;
• a second rotation shaft directly connected to the first ring gear and the second planet carrier and directly connected to the output shaft;
• a third rotation shaft directly connected to the first planet carrier and the second ring gear and selectively connected to the input shaft and/or selectively connected to a transmission housing;
• a fourth rotation shaft directly connected to the first sun gear and selectively connected to the input shaft and/or selectively connected to the transmission housing;
• and
• a dog clutch selectively connecting the input shaft to the fourth rotation shaft through two paths.