Mazda Motor Corporation

Satoshi Komori

Shinya Kamada

Tatsutoshi Mizobe

Kazuhiko Ueda

Junichi Doi

Norio Iwashita

Takamichi Teraoka

Tokimori Saka

Seiji Esaki

Naohiro Sakaue

Yoshihiko Fujita

Tatsuhiko Iwasaki

Shizuo Sumida

Yasuhiro Harada

Hiroyuki Arakawa

Shigeki Hiramatsu

Esaki Seiji

There is provided an automatic transmission comprising a first shaft capable of receiving torque from an engine, and four planetary gear sets arranged coaxially on the first shaft and in series in an axial direction of the first shaft. Each of the four planetary gear sets has a single sun gear and a single ring gear. Further, the automatic transmission comprises an output wheel arranged coaxially on the first shaft, and capable of outputting torque transmitted from the engine through some of the four planetary gear sets. The output wheel is arranged between two of the four planetary gear sets. Accordingly, the noise or vibration from the planetary gear sets in the automatic transmission may be reduced, while the overall length of the first shaft may be made shorter, and the overall size of the automatic transmission may be made smaller.

Automatic transmission for automotive vehicles

In an automatic transmission (AT) in which an input shaft (Input) and an output gear (Output) are disposed on the same axis and three clutches (C-C) and two brakes (B, B) are selectively operated to provide six forward speeds, first and second planetary gear sets (GS, GS) are configured to consistently reduce the speed of input rotation and output the speed-reduced rotation, thereby enabling downsizing of them. The first and second planetary gear sets (GS, GS) are arranged in a transmission case at both the axial ends thereof. Third and fourth planetary gear sets (GS, GS) are connected to each other to have four rotation elements in combination, thereby constituting a Simpson planetary gear train. One of the four rotation elements (a fourth carrier (PC) in an illustrated example) is connected to the output gear (Output). Rotations input and reduced in speed by the first and second planetary gear sets (GS, GS) are input to sun gears (S, S) of the third and fourth planetary gear sets (GS, GS), respectively. First to third clutches (C-C) and a first brake (B) are arranged to surround the first and second planetary gear sets (GS, GS).

Automatic transmission

This invention proposes a simulation apparatus which can simulate by easily coping with changes in component and model. A simulation apparatus simulates, using a system model, the dynamic performance of a target apparatus to be simulated, which includes a driving source and is constructed by a plurality of units for transmitting the driving force output from the driving source, and expresses the target apparatus by functional and data models. The functional model expresses each of units that construct the target apparatus by exchange of energy by the dynamic performance of that unit, and a parameter which determines that dynamic performance. The parameter for each unit is computed using static characteristic data read out from a memory, thus expressing each unit as a data model.

Simulation system using model

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Hiroshima, Japan

Satoshi Komori