Automatic transmission

An automatic transmission comprising first, second, and third planetary gear sets, each including

• a sun gear,
• a ring gear,
• a pinion meshing with the sun gear and the ring gear, and
• a carrier supporting the pinion, and including a pinion shaft rotatably supporting the pinion, and a carrier body supporting two ends of the pinion shaft, wherein
• the second planetary gear set is located on an outer periphery of the first planetary gear set so that the first and second planetary gear sets form a two-stage planetary gear set,
• the third planetary gear set is adjacent to the two-stage planetary gear set on one axial side of the automatic transmission,
• the carrier body of the second planetary gear set is integral with the carrier body of the third planetary gear set,
• the automatic transmission further comprises a lubricant feed passage for the second planetary gear set feeding a lubricant to a bearing between the pinion and pinion shaft of the second planetary gear set,
• the lubricant feed passage for the second planetary gear set includes
• a first oil passage in the carrier body of the third planetary gear set, the first oil passage extending from a first inlet axially toward the two-stage planetary gear set and radially outside, the first inlet being formed on a side of the carrier body of the third planetary gear set axially opposite to the two-stage planetary gear set and on an inner periphery of the carrier body of the third planetary gear set, and
• an oil passage in the pinion shaft of the second planetary gear set, the oil passage communicating with the first oil passage and the bearing of the second planetary gear set, and
• the lubricant feed passage for the second planetary gear set feeds the lubricant from the first inlet to the bearing of the second planetary gear set via the first oil passage and the oil passage in the pinion shaft of the second planetary gear set.