Kia Carnival (2009+). Instruction — part 304

MECHANICAL SYSTEM

OPERATION COMPONENTS AND FUNCTION

Operating Element

Symbol

Function

Under drive clutch

UD

Connect input shaft and under drive sun gear

Reverse clutch

REV

Connect input shaft and reverse sun gear

Overdrive clutch

OD

Connect input shaft and over drive carrier

Low&Reverse brake

LR

Hold LR annulus gear and OD carrier

Second brake

2ND

Hold reverse sun gear

One way clutch

OWC

Restrict the rotating direction of low & reverse annulus gear

Operating elements

UD/C

OD/C

REV/C

2ND/B

LR/B

OWC

P

!

R

!

!

N

!

D1

!

!

"

D2

!

!

D3

!

!

D4

!

!

1) " : OWC is operated when shifts from 1st gear to 2nd gear.
2) L&R brake is released in 1st gear when the vehicle speed is more than 5KPH approximately.

Torque converter and shaft

The torque converter consists of an impeller(pump), turbine and stator assembly in a single unit. The pump is
connected to the engine crankshaft and turns as the engine turns. This drawing force is transmitted to the turbine
through the oil which is recycled by the stator.
The transmission has two parallel shafts ; the input shaft and the output shaft. Both shafts are in line with the engine
crankshaft. The input shaft includes the overdrive clutch, reverse clutch, underdrive clutch, one way clutch, 2ND brake,
low&reverse brake, overdrive planetary carrier, output planetary carrier and transfer drive gear. The output shaft
includes the transfer driven gear.

CLUTCHES

The gear changing mechanism utilizes three multi-disc clutches. The retainers of these clutches are fabricated from
high-precision sheet metal for lightness and ease of production. Also, more responsive gearshifts at high engine
speeds are achieved by a pressure-balanced piston mechanism that cancels out centrifugal hydraulic pressure. This
mechanism replaces the conventional ball check valve.

UNDERDRIVE CLUTCH

The underdrive clutch operates in 1st, 2nd, and 3rd gears and transmits driving force from the input shaft to the
underdrive sun gear(A).
The components comprising the under clutch are as illustrated below.

Hydraulic pressure acts in the piston pressure chamber(B) (between the piston(c) and retainer) and thus pushes the
piston(C). In turn, the piston depresses the clutch discs and thereby transmits driving force from the retainer(D) to the
hub(E) side.

At high speed, fluid remaining in the piston pressure chamber is subjected to centrifugal force and attempts to push
the piston.
However, fluid in the balance fluid chamber(A) (the space between the piston and return spring retainer(B)) is also
subjected to centrifugal force.
Thus, the hydraulic pressure on one side of the piston cancels out the hydraulic pressure on the other side, and the
piston does not move.

REVERSE CLUTCH AND OVERDRIVE CLUTCH

The reverse clutch(C) operates when the reverse gear is selected and transmits driving force from the input shaft to
the reverse sun gear.
The overdrive clutch(D) operates in 3rd and 4th gears and transmits driving force from the input shaft to the overdrive
planetary carrier and low-reverse annulus gear.

BRAKES

The gear changing mechanism utilizes two multi-disc brakes.

LOW&REVERSE BRAKE AND SECOND BRAKE

The low&reverse brake(A) operates in 1st and reverse gears, when the vehicle is parked, and during manual
operation. It locks the low&reverse annulus gear and overdrive planetary carrier to the case.
The second(C) brake(B) operates in 2nd and 4th gears and locks the reverse sun gear(D) to the case.
The components comprising the low&reverse brake and second brake are as illustrated below.
As shown, the discs and plates of the two brakes are arranged on either side of the rear cushion plate(E), which is
itself secured to the case(F) by a snap ring.

OWC

To improve the shift feeling from 1st to 2nd gear, OWC was adopted on the low&reverse brake annulus gear. Instead
of hydraulic fixing by Low&reverse brake at the 1st gear, this mechanical fixing device was used. This structure is not
a new concept, because this OWC already has been installed on the previous models.

ACCUMULATORS

Number

Function Name

Color

1

Low&Reverse Brake

None

2

Underdrive Clutch

Yellow

3

Second Brake

Blue

4

Overdrive Clutch

None