Komatsu Corporation

Nobuhito Yasuta

Masaki Shiohara

Taku Matsuo

Michihiro Aida

Kohei Izumi

Yutaka Kamatani

A multi-speed transmission includes: an input member; an output member; first to fourth planetary gear sets arranged in order in an axial direction from the input member toward the output member and each including a sun gear, a planetary carrier and a ring gear; first to third clutches; and first to third brakes. Each of the first to third clutches and the first to third brakes is operatively coupled to at least one planetary gear set of the planetary gear sets, and selectively engageable to produce a set of different gear ratios including at least ten forward gear ratios and at least two reverse gear ratios between the input member and the output member. The first clutch selectively couples the third sun gear of the third planetary gear set to the fourth planetary carrier of the fourth planetary gear set.

Multi-speed transmission

A first carrier rotates integrally with an input shaft. A third sun gear and a fourth sun gear rotate integrally with a first intermediate shaft. A third carrier rotates integrally with a second ring gear. A fourth carrier rotates integrally with a third ring gear, and outputs power. A first clutch couples a first ring gear and a second sun gear to the first intermediate shaft. A second clutch couples the first carrier to a second carrier. A third clutch couples the second carrier to the first intermediate shaft. A first brake brakes rotation of a first sun gear. A second brake brakes rotation of the second ring gear and the third carrier. A third brake brakes rotation of a fourth ring gear.

Growing community of inventors

Hakusan, Japan

Nobuhito Yasuta