| US 7,517,297 B2 | ||
| Multistage transmission | ||
| Atsushi Tabata, Okazaki (Japan); Akira Hoshino, Nishikamo-gun (Japan); Terufumi Miyazaki, Toyota (Japan); Hirofumi Ota, Toyota (Japan); Atsushi Honda, Seto (Japan); and Akiharu Abe, Toyota (Japan) | ||
| Assigned to Toyota Jidosha Kabushiki Kaisha, Toyota-shi (Japan) | ||
| Filed on Jul. 17, 2007, as Appl. No. 11/778,687. | ||
| Application 11/778687 is a division of application No. 10/832422, filed on Apr. 27, 2004, granted, now 7,267,630. | ||
| Claims priority of application No. 2003-149539 (JP), filed on May 27, 2003; application No. 2003-346250 (JP), filed on Oct. 03, 2003; and application No. 2003-408270 (JP), filed on Dec. 05, 2003. | ||
| Prior Publication US 2008/0261749 A1, Oct. 23, 2008 | ||
| Int. Cl. F16H 3/62 (2006.01) | ||
| U.S. Cl. 475—276 | 9 Claims |
| 1. A planetary-gear-type multistage transmission comprising:
a first transmission portion including a first intermediate output path for outputting rotations of an input member at a fixed
transmission ratio determined in advance, and a second intermediate output path for outputting rotations of said input member
after reducing the rotations at a greater transmission ratio than said first intermediate output path; and
a second transmission portion having a single-pinion type second planetary gear set, a single-pinion type third planetary
gear set, and a double-pinion type fourth planetary gear set, in which a first rotary element being composed of a sun gear
of said second planetary gear set and a sun gear of said third planetary gear set connected to each other, a second rotary
element being composed of a carrier of said second planetary gear set, a carrier of said third planetary gear set and a carrier
of said fourth planetary gear set connected to each other, a third rotary element being composed of a ring gear of said second
planetary gear set, a fourth rotary element being composed of a ring gear of said third planetary gear set and a ring gear
of said fourth planetary gear set connected to each other, a fifth rotary element being composed of a sun gear of said fourth
planetary gear set; and said first rotary element being selectively brought to a stationary state by a first brake, said second
rotary element being selectively brought to a stationary state by a second brake, said third rotary element being selectively
brought to a stationary state by a third brake, said fifth rotary element being selectively connected to said second intermediate
output path via a first clutch, said first rotary element being selectively connected to said second intermediate output path
via a second clutch, said second rotary element being selectively connected to said first intermediate output path via a third
clutch; and having a fourth clutch for causing said five rotary elements to rotate integral with said first intermediate output
path by being engaged with said third clutch; and outputting rotations by said fourth rotary element being connected to an
output member;
wherein a plurality of gear stages are established by changing engagement and disengagement of said clutches and brakes.
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