|
|
AUTOMATIC TRANSAXLE K69 K Fourth Gear (D range) Outline • Shift solenoids A and B are OFF, and only C is ON in fourth gear. • As shift valve B moves to the lower side, operation pressure of the low clutch is drained. Then, as the shift valve C moves to the upper side, operation pressure is supplied to the 2-4 brake. Operation • The driving force of the input shaft is transmitted to the front planetary carrier via the high clutch causing it to revolve the front pinion counterclockwise. However, as the load from the vehicle is applied, the front pinion tries to rotate clockwise and the front sun gear tries to rotate counterclockwise. • Since the front sun gear is fixed by engagement of the 2-4 brake, the front pinion tries to rotate counterclockwise, while revolving counterclockwise because the front sun gear is fixed. • Due to this, the driving force of the front pinion overcomes the load from the vehicle to rotate the front internal gear counterclockwise faster than the counterclockwise rotation speed of front planetary carrier (input). (Rotation speed of the output gear is faster than that of the input shaft.) • The driving force transmission of the reduction gear is the same as that in first gear. • During deceleration, engine braking is not applied for the same reason as that of first gear. AMU0517A571 |