Automobile Gearboxgaurang

8/13/2019 Automobile Gearboxgaurang

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1. Range Change Group Double H Shift

Mechanism

2. Range Change Group Superimposed H ShiftMechanism

Shift ctuation


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SHIFT PATTERN

Selector patent-1

Selector patent-2

Selector patent-1

Selector patent-2

Double H Pattern

Superimposed

H shift pattern

Superimposed

H shift pattern

Double H Pattern


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DOUBLE H SHIFT MECHANISM

This shift mechanism divided into 5 adjacent gates.

There is spring loaded neutral position in both gates 3/4 and 5/6.

Different strengths of spring detent enable the driver to navigate effectively through the

transmission shift pattern.

The pneumatic selection feature operates automatically when changing from gate 3/4 to

5/6 or back again.


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Superimposed H Shift Mechanism

The shift mechanismdivided into 3 adjacent

gates.

There is spring loadedNeutral position in

gates 3/4 and 7/8.


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Superimposed H Shift MechanismThe pneumatic selection feature operated

via the preselection switch on the shiftlever when changing from gate 3/4 to gate

5/6 or back again.


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Shifting of TransmissionZF-Ecomid transmissions are synchro-

mesh transmission.A synchromesh transmission is one which

enables all gears to rotate in the same

direction at synchronous speeds.This system makes process quicker and

more reliable.


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Shifting of TransmissionThere isnt any problem of double

declutching during up shifts.No intermediate throttle application and no

double declutching when shifting down,

even when driving downhill and in difficultsituations.


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Transmission Shift Pattern1. Double H Shift Pattern.

2. Superimposed H Shift pattern.


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Double H Shift PatternThe double H shift pattern has what is

known as neutral position in gates 3/4 (lowrange ) and 5/6 (High Range).

1R

3

5

2

46

7

8

N

N

C


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Double H Shift PatternTo select gates 1/2 or 7/8, move the

selector level against spring force in therelevant direction and hold against this

force when selecting.

The selector lever jumps back to theneutral when released from mid-position of

the gate.


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Double H Shift PatternGate 3/4 and 5/6 are separated by a more

powerful spring detent.During this gate change, an automatic

changeover is performed in the range

change group.The gate for reverse gear is protected by a

pawl stop and requires more force to be

applied.


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Double H Shift PatternThe different level of spring force provided

good orientation within the shift pattern ,i.e. the gates can be located with reliable

certainty.


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Superimposed H Shift PatternThe superimposed H shift pattern has a spring

loaded return to neutral (idling) in the 3/4 (low

range change group) and 7/8 (high range

change group) gates.

R

1

3

2

4

N

C

6

8

5

7

N


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Superimposed H Shift PatternTo select gates 1/2 or 5/6, move the

selector lever jumps against spring force inthe relevant direction and hold against this

spring force when selecting.

The selector level jumps back to theneutral when released from the mid-

position of the gate.


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Superimposed H Shift PatternThe reverse gear is secured by means of

a bolt detent and additional force has to beexerted to select it.


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Gear SelectionMove the selector rapidly without too

much force. This is important when thetransmission oil is still cold.

When selecting gear, hold the selector

lever against the pressure point until thesynchronizing process is complete and the

gear has engaged properly.


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Gear SelectionFor Double H Change out of the gate

into 5/6 gate or vice versa by brieflystriking the shift lever with your palm of

your hand and swiftly moving the shift

lever into the gear required without

exerting too much force.


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Gear Selection

Down Shifting Up Shifting

Gate change


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Gear SelectionFor superimposed H if someone wants to shift from 4thgear into the 5thgear in the basic transmission then he

1. must Preselect high ratio (high range group) on selector switch2. Disengage the clutch pedal3. Shift into neutralat which point the range change group starts

to change over.4. Select gate .5. Shift the basic transmission into 1stgearthe range change

group will by now have shifted into high ratio6. Engage the clutch7. Leave preselector switch in the selected range group


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Bleeding the TransmissionThe transmission oil heats up during

travel.This results in formation of excess

pressure which is continuously removed

via a bleed valve

Why???

Automobile Gearboxgaurang

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