Page 134 - Automotive Engineering

Transmissions and driveline CHAPTER 5.1

B Primary shaft Input
A shaft

Output shaft

Secondary shaft First gear

Second gear

Third gear

Fourth gear

Fifth gear

Fig. 5.1-22 Power flow paths for different gears in JF506E (courtesy of Jatco).

combined motion increases the output to about a half of driven by the carrier and rotates in the same sense at
the primary speed. about 1.5 times the primary speed.
Third gear – the annulus and the sun of epicyclic B are Fifth gear – the path from input to the secondary is
now locked together (via the carrier of A) and all of the the same as fourth gear but now the reduction brake is
components rotate at the same speed. dis-engaged and the carrier and sun locked together.
Fourth gear – drive comes entirely from epicyclic A Again, this means that the whole reduction epicyclic set
with the sun gear locked. The annulus of this gear is will rotate as a single unit.

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