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Automobile Gearboxgaurang

Jun 04, 2018

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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???

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