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Automatic transmission-41
In automatic 4 th -Gear (overspeed gear), the drive of transmission is sent to the front clutch cylinder through the input shaft. The
operation principle of each function assembly of transmission is shown as follows:
The engagement of clutch C1 drives the planetary gear carrier rotates in clockwise rotation.
The engagement of B1 brake belt makes the reverse sun gear to stop.
When the planetary gear carrier rotates, the long planetary gear rotates around the static reverse sun gear, at the same time, it
rotates around its axial line to drive the gear ring and output shaft to generate the forward movement in the speed higher than
that of input shaft (i.e. overspeed) clockwise.
The forward central gear rotates in the speed higher than input shaft and is more than the speed when 3-4 one-way clutch
(OWC) is engaged.
The engagement of clutch C2 is used to reduce the speed difference generated by 3-4 one-way clutch (OWC).
Control:
In the stable status, the status of solenoid valve and valve is shown as follows:
The solenoid valve S1 is powered on ; S2 is powered off.
When the solenoid valve S1 is powered on, the small end of 3-4 shift valve is in 4
th
-Gear position for the pressure of line 500.
When the solenoid valve S2 is powered off, the large opening of 2-3 shifting valve is in 4 th - Gear position for the pressure of
line 500.
The 1-2 Gear shifting valve is kept in 4
th
-Gear position for the pressure of S2 oil loop.
The 2
nd
-Gear loop oil (line pressure) from the 1-2 shift valve flows into the brake belt combination regulating valve and 2-3
shift valve directly.
The brake belt combination regulating valve provides the 2
nd -Gear loop oil for the brake belt attachment loop (BAF) (adjusted
by product of line pressure and valve ratio)
The brake belt combination lip oil is directly supplied to:
External combination part of front servo
Enter into the internal combination part of front servo piston through 3-4 shift valve
The 1st-Gear-2 switch valve provides a oil-drain port when the transmission is switched to 1st-Gear.
The 2nd-Gear loop oil in 2-3shift valve flows into the 3rd-Gear loop directly.
The 3rd-Gear loop oil from the 2-3 shift valve flows into the clutch combination regulating valve and 4th-Gear-3 sequence
valve directly
The clutch combination regulator valve supplies the oil for the clutch combination loop (CAF) (Regulated by the product of
line pressure and valve rate)
CAF oil is directly supplied to:
clutch C1
4th-Gear-3 sequence valve
The drive oil(line pressure) form the manual-operated valve forces the engagement of clutch C2
Refer to Figure 5.8 and Table 5.9.
Table 5.9 Participating condition of each unit in automatic 4 th –Gear (overspeed Gear)
clutch
Name of participation unit
Automatic 4
th
-Gear
(overspeed Gear)