| US 7,553,253 B2 | ||
| Automatic transmission | ||
| Shinya Kamada, Hiroshima (Japan); Junichi Doi, Hiroshima (Japan); Takamichi Teraoka, Hiroshima (Japan); Tokimori Saka, Hiroshima (Japan); Tatsutoshi Mizobe, Hiroshima (Japan); Naohiro Sakaue, Hiroshima (Japan); Yoshihiko Fujita, Hiroshima (Japan); Norio Iwashita, Hiroshima (Japan); Satoshi Komori, Hiroshima (Japan); Kazuhiko Ueda, Hiroshima (Japan); and Seiji Esaki, Hiroshima (Japan) | ||
| Assigned to Mazda Motor Corporation, Hiroshima (Japan) | ||
| Filed on Aug. 31, 2006, as Appl. No. 11/513,081. | ||
| Claims priority of application No. 2005-263965 (JP), filed on Sep. 12, 2005. | ||
| Prior Publication US 2007/0060439 A1, Mar. 15, 2007 | ||
| Int. Cl. F16H 3/62 (2006.01) | ||
| U.S. Cl. 475—284 [475/276; 475/285] | 7 Claims |
| 1. An automatic transmission in which an input shaft and an output part are disposed on the same axis, first to fourth planetary
gear sets each formed of a sun gear, a carrier and a ring gear are provided and first to third clutches and first and second
brakes are selectively operated to switch between power transmission paths from the input shaft to the output part, thereby
providing at least six forward speeds, wherein
each of the first and second planetary gear sets includes a given rotation element connected to the input shaft to consistently
reduce the speed of input rotation and output the speed-reduced rotation,
the third and fourth planetary gear sets are single pinion planetary gear sets and are connected to each other to have four
rotation elements in combination, one of the four rotation elements being connected to the output part, and
the first and second planetary gear sets are arranged oppositely in the axial direction of the third and fourth planetary
gear sets with the third and fourth planetary gear sets interposed therebetween.
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