| 摘要 |
<P>PROBLEM TO BE SOLVED: To attain a reverse gear ratio, which needs a large driving force, in a low gear side continuously variable gear mode without relying on a low gear ratio fixed mode, enabling omission of the low gear ratio fixed mode. <P>SOLUTION: In a hybrid transmission with a carrier Cf being fixed by a low brake L/B, a revolution of a sun gear Sr turns to a reverse one for the sun gears Sc and Sf as shown by a lever GF (G3). Therefore, an output Out linked to a carrier Cr as shown by a lever GR (G2) turns to a lower revolution speed (including reverse revolution) than the revolution speeds of a carrier Cc on a lever GC (G1) and an input (In) of a ring gear Rr, and power transmission can be attained in the low gear side continuously variable gear mode. By forming a relation so that a formula, δ>α*β/(1+α+β) is established among displacements in elements 1, α, β, δ and without a large output generation by a motor/generator MG1, MG2, the reverse gear ratio of outputting a required large torque in the low gear side continuously variable gear mode can be selected. Thus the reverse gear ratio which needs a large driving force can be attained without relying on the low gear ratio fixed mode, and this mode can be omitted. <P>COPYRIGHT: (C)2007,JPO&INPIT |
