mercedes a-b-class cvt transmission-1

8/17/2019 Mercedes a-B-Class CVT Transmission-1

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Information partly provided by EuroMatic

Mercedes A, B-ClassCVT transmission


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Cut away view


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Cut away view


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Primary pulley

Torque converter Pushbelt

Sectional view

Forward clutch

Reverse clutch

Final reduction ear

!ifferential

Secondary pulley


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Forward and reverse clutch


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"alve body


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"alve body


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"alve body #


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"alve body


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Crac$ in valve body


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Crac$ in valve body


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BMW-MINI Cooper CVT transmission


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Sectional view

Primary pulley

%ilpump

Forward clutch

Reverse clutch

"alve body

Planetary earset

Final reductionears and differential

Pushbelt


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2000

3000

4000

5000

000

T a r ! e t e n ! i n e

s p e e d

Tar!et en!ine speed

"o#

$%erdri%e

Vario!ram

!rive off full throttle

throttle &

'ever position &

Enine speed &

I variator &

"ehicle speed &

()) *

!rive

+)))

low

)

0 20 40 0 &0 100 120 140 10 1&0 200

0

Ve'icle speed ()m*'+

,,))

top

(-)

,)))

medium

(+)

.)))

low

/0

0)))

low

+.


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2000

3000

4000

5000

000


s p e e d

Tar!et en!ine speed

"o#

$%erdri%e

(

+0 . , /

Vario!ram

Chanin from ! to step mode

throttle &

'ever position &

Enine speed &

I variator &

"ehicle speed &

.) *

!

++))

%verdrive

()) $m1h

0 20 40 0 &0 100 120 140 10 1&0 200

0


.) *

Step

0())

/th ear

()) $m1h


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2000

3000

4000

5000

000


s p e e d

Tar!et en!ine speed

"o#

$%erdri%e

(

+

0 . , /

Vario!ram

0 20 40 0 &0 100 120 140 10 1&0 200

0


!own shiftin

throttle &

'ever position &

Enine speed &

I variator &

"ehicle speed &

.) *

Step mode

++)) rpm

/

-) $m1h

.-))

0

-) $m1h

02))

.

-) $m1h

0)))

,

-) $m1h


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2000

3000

4000

5000

000


s p e e d

Tar!et en!ine speed

"o#

$%erdri%e

(

+

0 . , /

Vario!ram

0 20 40 0 &0 100 120 140 10 1&0 200

0


3ic$ down mode

throttle &

'ever position &

Enine speed &

I variator &

"ehicle speed &

$d

Step

++))

,

/)

$d

Step

.-))

,

(0)

$d

Step

.,))

.

4-

$d

Step

.+))

0

2)

$d

Step

,+))

+

/)


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5daption C"TC"T adaption 6M7 Mini&5fter repair or replacement of valve body8 adaption

of the C"T is hihly recommended96efore adaption run8 the adaption should be


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5daption :Clutch=For the followin steps t'e ra)e should be used9

(9 Start with cold enine9 7ith an increasedstationary rpm shift in P durin () seconds anddurin () seconds in !9 The display shows .

in P position9+9 Repeat the followin steps () times9

a9 Shift in N for 0 seconds

b9 Shift in / for 0 secondsThe display shows . in P position9


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5daption :Clutch=

09 Repeat the followin steps () times9a9 Shift in N for 0 seconds

b9 Shift in for 0 seconds

c9 The display shows . in P position


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5daption :Ratio=(9 'et the car accelerate to &5 )m*'9 Release

the throttle pedal and let the car rol out to astop9 The transmission will adapt from .,))8.)))8 >98 (,)) and (.)) rpm9 The display

shows . in P position9+9 The enine is now on wor$in temperature9

The stationary rpm is -))1min9 epeat step 2

and 3 rom t'e cltc' adaption09 Turn the car$ey in position )9


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5daption C"TATTNTI$N

7ait for at least () minutes before

sconnec n e a ery9The battery should be disconnected forminimum 2 mintes?


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Problems@ Aard shift B

@ Eratic shift between -) (() $ph9@ Bo upshift

@ Bo downshift

This $ind of problems could be also solvedby adaption9


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Secondary pressure

Plus

Clutch pressure

P


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Pressures

Clutch pressure at stall& 2- -, psi 1 ,8, /8) bar +)))


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Plus

%il level control plu


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Connector plu6tepper motor Resistance&

6etween pin 5 and 6 # D+08, 6etween pin C and ! # D+08,

Resistance&6etween pin ( and + # (8-

6econdar7 pressre solenoid

Resistance&6etween pin 0 and . # 08,


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"alve body


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"alve body


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"alve body


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"alve body


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"alve body


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8onda Ci%icCVT transmission

Pushbelt Primary pulley


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y p y

Reverse clutch

Planetary earset

Forward clutch

%ilpump

Torsional damper

Inputshaft

Secondary pulley

!ifferential

!rivin ear

Par$in ear

Ta$e off clutch

6ectional %ie#


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Cause of clutch udder


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Adi MltitronicA4*A and A5


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5udi Multitronic@ Introduction

@ Gearbo;modules

@ Gearbo; control@ +nd eneration


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MH'TI


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Introduction

Adi Mltitronic9@ C"T@ Pull chain

@ Can be used incombination with +9-


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Introduction& Multitronic and ,


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Introduction& The earbo; concept


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Introduction& Specifications


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Gearbo; modules

Gearbo; modules& Sectional view


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Gearbo; modules& Sectional view

%il pump andtransfer case areshown folded9


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Common failures

@ Forward clutch judder

@ Slip of chain

@ Instabilit of en ine s eed at 50 – 70 h

@ !o dri"e at all@ #wo$mass dri"e damper


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Gearbo; modules& The flywheel damper unit

.


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Gearbo; modules& Forward clutch1reverse clutch and planet ear set


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G b d l F d l t h1 l t h d l t t


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Gearbo; modules& Forward clutch modiication


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Gearbo; modules& Forward clutch modiication

Modiication or#ard cltc'9

From / to 2 plates End clearance& (8/ to (8- mm Part number& )(J 04- 4.. :2 frictions=

Pressure plates :shims=& (8- +8(, +8/, +8-, 08(, Part number& )(J 04- +.(

G b d l F d l t h1 l t h d l t t


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Gearbo; modules& Pump a;le


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Gea bo odu es o a d c u c 1 e e se c u c a d p a e ea se

Gearbo; modules& Clutch control1


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Gearbo; modules& Clutch control1

Gearbo; modules& Clutch control


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B+(, # pressure reulatin valve"ST" # pilot pressure value3S" # clutch control valveSI" # safety valveAS # manual selector valve


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Gearbo; modules&Clutch control

B+(, # pressure reulatin valveB-- # solenoid valve ("ST" # pilot pressure value3S" # clutch control valveSI" # safety valveAS # manual selector valve



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Gearbo; modules& Clutch coolin system


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Gearbo; modules& 5u;iliary reduction ear step


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Gearbo; modules& "ariator


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Gearbo; modules&


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"ariator

Gearbo; modules& Transmission control


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Gearbo; modules& Transmission control


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B+(/ # Pressure reulatin valve

"ST" # Pilot pressure valve" # reduction valve

Gearbo; modules&


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Torque sensor

Gearbo; modules&Torque sensor


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q

Gearbo; modules& Grooved earin :Torque sensor=


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Gearbo; modules& Grooved earin :Torque sensor=


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Gearbo; modules& Chain


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Gearbo; modules& Chain


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Bew chain

!amaed chain

Gearbo; modules& Chain :new and damaed=


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Bew chain

!amaed chain

Gearbo; modules& Chain :new and damaed=


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Bew chain

!amaed chain

Gearbo; modules& Chain removal


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To release the nut8turn cloc$wise



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Gearbo; modules& %il supply


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Gearbo; modules& %il pump


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Gearbo; modules& Suction et pump :entrainment pump=


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Gearbo; modules& Suction et pump :entrainment pump=


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Part number& )(J


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Gearbo; modules& Electrohydraulic control :oil pump=


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Gearbo; modules&Aydraulic control unit



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B-- # solenoid valve ( :Clutch coolin1safety valve=B+(, # pressure reulatin valve (:actuates clutch control valve=B+(/ # pressure reulatin valve +:actuates reduction valve "=

Gearbo; modules& Aydraulic control unit

Piston

%il inection

hole for splashil Piston rins

Screw insert for

pulley no (


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PistonRins

hole for splashoil cover Piston rins pulley no9 (

Screw insert forpulley no9 +

Gearbo; modules& Selector shaft and par$in loc$


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Gearbo; modules& Gearbo; housin1 ductin and sealin systems


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Gearbo; modules& 5TF coolin


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Renew allways after repair ???

:earo; control& Multitronic control unit J+(2


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Gearbo; control

1n!ine Tor


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4 Cltc' .rotection

5 Cltc' 6tats

:ear le%er position

= oad 6peed

& Crrent :ear

> Tar!et :ear

10 $n-Board /ia!nostics

3 n!ine Tor


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Multitronic +nd eneration


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Multitronic +nd eneration& !ifferences with (st eneration

+ d ti


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+nd eneration5udi 5,

(st eneration5udi 5.15/



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7ith than$s to Eur

mercedes a-b-class cvt transmission-1

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