Importance

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Abstract

Provided is an automatic transmission capable of reducing friction loss. A first element (Sa) is coupled with an input shaft (2), a second element Ca is coupled with a first driving gear (G1a). A first driven gear (G1b) is pivotally supported on an output shaft (3), a seventh element (Rc) is coupled with a second driving gear (G2a), and a second driven gear (G2b) is fixed to the output shaft (3). A third element (Ra) and a fifth element (Cb) are coupled to form a first coupling body, a sixth element (Rb) and a ninth element (Sc) are coupled to form a second coupling body. The automatic transmission includes a first engagement mechanism (C1) coupling the input shaft (2) and the eight element (Cc) releasably, a second engagement (C2) fixing the first driven gear (G1b) to the output shaft (3) releasably, a third engagement mechanism (C3) coupling the second element (Ca) with the second coupling body releasably, and a fourth to a sixth engagement mechanisms (B1 to B3) fixing respectively the first coupling body, a fourth element (Sb) and the eighth element (Cc) to a transmission case (1) releasably.

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