Impact power tool

An impact power tool comprising:

• a motor having a drive gear shaft,
• a first planetary gear set including a first planet carrier, and a plurality of first planet gears pivotally connected with the first planet carrier and engaged with the drive gear shaft;
• a second planetary gear set including a second planet carrier having an internal gear, a plurality of second planet gears pivotally connected with the second planet carrier, and a clutch having a sun gear;
• wherein the second planet gears engage with the sun gear, and the clutch connects with the first planet carrier;
• a transmission shaft comprising a round shaft at one end, a polygonal shaft at the other end, and a small gear disposed between the round shaft and the polygonal shaft;
• wherein the round shaft passes through a central hole of the sun gear of the clutch;
• an intermediate shaft having an axial polygonal hole;
• wherein the polygonal shaft of the transmission shaft is fitted into the polygonal hole of the intermediate shaft;
• an impact seat including a plurality of hammer blocks on an end surface;
• wherein the intermediate shaft is fitted into and drives the impact seat to rotate;
• and
• an output shaft comprising a polygonal hole at one end corresponding to the polygonal shaft of the transmission shaft, and a plurality of projections to be struck by the hammer blocks.