Manual Transmissions Lec [Compatibility Mode]

8/9/2019 Manual Transmissions Lec [Compatibility Mode]

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ey express e

mathematical relationship.

They express the amount

between gears.

The tell how man timesone gear turns in relation

to the other.

Copyright 2007 by Nelson, a division of Thomson Canada Limited.


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Calculating Transmission Gear

Ratios

ep -

Calculate the ratio of the first set of gears by

v ng e r ven ou pu gear y e r ve

(input) gear.

Example:

If the drive ear has 20 teeth and the drivengear has 40 teeth, the gearset ratio would be

2 to 1 or 2:1



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Ratios

Calculate the ratio of the second set of gears

by the drive (input) gear.Example:

If the drive gear has 20 teeth and ther ven gear as ee , e gearse ra o

would be 3 to 1 or 3:1



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Ratios

ep -

Multiply the answer from the first calculation

w e answer rom e secon ca cu a on.

Gearset 1 Gearset 2 = Total gear ratio

=



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Synchromesh transmissions

Gears are constant mesh and collar shifted.

Collars are equipped with synchronizers.

Synchronizers eliminate the need to equalize.

They are used on all current models of cars.



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Sleeve

Inserts or spring-and-ball detent devices



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Neutral The in ut shaft drives the counter shaft.

All of the gears on the main shaft rotate.

The synchronizers are not engaged with any gear.

No power is transferred to the output shaft.



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Forward Gears

The power enters transmission through the input

.

The synchronizer sleeve is engaged with the dog

teeth of the selected gear.

The power is transferred from the input shaft,

through the counter shaft, and up to the selected

.

The gear drives the output shaft.



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everse

The power enters transmission through the input

The reverse gear synchronizer sleeve is engaged

with the reverse gear dog teeth. The power is transferred from the input shaft,

through the counter shaft, through the reverse idler

, . The reverse gear drives the output shaft in

reverse.



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Neutral

The input shaft is being turned by the engine.

The synchronizer collars are centered

between their gear positions.

shaft.

.



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Forward Gears

The gears on the input shaft are in constant mesh

w ose on e ou pu s a .

The synchronizer hub is splined to the output

shaft.

When a gear is selected, the synchronizer collar

engages the hub.

The power flows from the gear on the input shaft

through the selected gear on the output shaft.



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Most transaxles use a sliding reverse gear.

mesh with a gear on the input shaft and one

on the output shaft. The additional gear causes the output shaft

to turn in the direction opposite to the input

.


continued


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n erna - ype

- May be located at the top or side of the

.

- The shift fork and

located in the

transmission cover.



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maintain gear selection.



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-

- Uses levers and rods that are connected to

transmission.



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meshed gears of various sizes to givethe en ine a mechanical advanta e over

its driving wheels.

the differential gearing needed to

roduce the final drive ear ratios.



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ransm ss ons are norma y use on rear-

wheel drive vehicles.

ears n e ransm ss on ransax e

transmit power and motion from an input.

When a small gear drives a larger gear,

u u u u wincreases.



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different speeds to the same speed forsmooth clash-free shifting.

Gear ratios indicate the number of times

the input drive gear rotates for every.

Idler gears are used to reverse the

rotational direction of the output shaft foroperating the vehicle in reverse.


Manual Transmissions Lec [Compatibility Mode]

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