Mechanical System

Mechanical system

COMPONENTS




Function






Front clutch










Rear clutch










End clutch










Kick down brake



















Low&Reverse brake



















One Way Clutch (O.W.C)










Planetary Gear
The planetary gear set incorporated in this transaxle consists of a forward sun gear, a reverse sun gear, a short pinion, a carrier to support both pinions, and an annulus gear.
The reverse sun gear is connected to the front clutch retainer via the kickdown drum, while the forward sun gear is connected to the rear clutch hub.
The carrier is built in one unit with the low reverse brake's hub and the outer race of the one-way clutch. The carrier is connected to the end clutch via the end clutch shaft.
The annulus gear, to which the output flange is connected, conveys driving force to the transfer drive gear installed on the output flange. And the parking sprag is provided on the outer circumference of the annulus gear.
The Ravigneaux type planetary gear set consists of two sun gears, each meshing with one of two sets of planetary pinion gears in a single carrier, and a single annulus gear that meshes with one of the sets of pinions. The two sun gears are called the forward and the reverse sun gears, for the gear conditions they operate in. Power input is to either of these two sun gears. Power output is through the annulus gear, which has the parking sprag on the outer circumstance. Various holding elements are built into gear set components.- Ravigneaux type planetary gear ratio.





Parking Mechanism
When the shaft is in the "P" range, the parking pawl engages with the parking sprag provided on outer circumference of the annulus gear to fasten the output shaft, to prevent the wheels from rotating. In other words, when the select lever is set to the "P" range, the detent plate and the parking sprag rod move in the direction of arrow, causing the cam on the parking sprag rod to push up the parking pawl to engage with the sprag.
In case the parking pawl collides against a crest of the sprag, only the rod moves because the parking pawl cannot be moved upward, and the cam, while pressing the spring, collides with the parking pawl and the support, and is with held in this condition. If the car is moved even slightly in this condition, the turning of wheels causes the annulus gear to turn as well. Since the cam is pressed in the direction of arrow, the parking pawl is pushed up as a bottom of the sprag aligns with the parking sprag to engage with the sprag.
In this way, the parking mechanism eliminates any chances of the vehicle from being.










Power flow





* - Engine start possible
+ - Parking mechanism
o - Element engaged in each gear position
x - Pre-engaged element
1) F/C : Front Clutch
2) R/C : Rear Clutch
3) E/C : End Clutch
4) OWC : One Way Clutch
5) K/D : Kickdown brake
6) L&R : Low&Reverse brake
For each shift condition, certain holding units in the transaxle are used. Knowing which holding element is used and how they are connected in the transaxle, we can trace the power flow through the transaxle for each shift condition. One set of pinions, the short pinions, meshes with the reverse sun gear.
The other set, the long pinions, meshes with both the forward sun gear and with the annulus gear. The two sets of pinions also mesh with each other in pairs. The pinion carrier is built as a unit with the low reverse brake hub and the outer race of the one-way clutch. Power input is to either of the two sun gears.
The reverse sun gear is connected to the front clutch retainer through the kick-down drum. The forward sun gear is connected to the rear clutch hub. So by engaging either the front or the rear clutch, power is directed to either the reverse or the forward sun gear. When both front and rear clutches are engaged, the gear set is locked, and power passes directly through the transaxle. Power output is through the annulus gear, which has the parking sprag on the outer circumference and is connected to the output flange.

1st Gear ("D" and "2" range)
Operating elements: Rear Clutch, One-Way Clutch





1st Gear ("L" range)
Operating elements: Rear Clutch, Low & Reverse Brake





2nd Gear ("D" and "2" range)
Operating elements: Rear Clutch, Kick Down Brake





3rd Gear ("D" range)
Operating elements: Front Clutch, Rear Clutch, End Clutch





4th Gear ("D" range)
Operating elements: Front Clutch, Rear Clutch, End Clutch





"R" range
Operating elements: Front Clutch, Low & Reverse Brake