Design of a five speed gearbox

zaveri · 2012-11-22T04:46:19+00:00

The best example for such a gear box is the gear box used in all modern cars. now as far as automobile gearboxes are concerned, 1) does the reverse gear actually count as a speed ? due to which while designing a gearbox for 5 forward speeds and one reverse speed, the gearbox can then be designed as a six-speed gear box ? 2) now leaving aside the reverse gear, and considering the 5 forward speeds alone, what would be the steps of speeds and the number of shafts required ? for a four speed gearbox, steps of speeds would be 1x2x2 and hence the number of shafts are three. but then what would it be for a 5 speed GB ?steps of speeds would be 1x5 by which number of shafts again turns out to be just 2

Design of a five speed gearbox

zaveri
@zaveri-5TD6Sk

Updated: Oct 23, 2024

Views: 1.3K

The best example for such a gear box is the gear box used in all modern cars.

now as far as automobile gearboxes are concerned,

1) does the reverse gear actually count as a speed ? due to which while designing a gearbox for 5 forward speeds and one reverse speed, the gearbox can then be designed as a six-speed gear box ?

2) now leaving aside the reverse gear, and considering the 5 forward speeds alone, what would be the steps of speeds and the number of shafts required ?

for a four speed gearbox, steps of speeds would be 1x2x2 and hence the number of shafts are three.

but then what would it be for a 5 speed GB ?steps of speeds would be 1x5 by which number of shafts again turns out to be just 2

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zaveri

Member • Nov 23, 2012

come on guys .no takes on this ?

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white_hat

Member • Nov 25, 2012

A 5 speed gearbox refers to five forward speeds.In all gearboxes there are only two shafts, a lay shaft and a main shaft.And what do you mean by step of speeds , I din't understand.

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PuneetVerma

Member • Nov 26, 2012

ah...you forgot me tag..anyways I got some time to visit CE before my last exam this semester.

@topic 5 Speed Gearbox means five forward gear and one reverse gear. As reverse gear has similar working to that of 1st gear (just reverse in direction, speed wise both are same). Therefore its not called as 6 speed gearbox.

1st and Reverse are in contact with same gear but difference is that gear has one Idler gear that forms a gear train and output gets reversed.

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zaveri

Member • Nov 26, 2012

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steps of speed is nothing, but a term which has to be dealt with, while designing gear boxes. actually this is what helps you to decide the number of shafts.

the steps of speeds are obtained by decomposing the total number of speeds of a gear box into its prime factors including 1. the number of factors gives the number of shafts.

for example for a 4 speed gear box the steps of speed are 1x2x2 (4=1x2x2). hence three shafts are required.

for an 18-speed gear box, it goes as (1x2x3x3). hence 4 shafts are required. (1 motor shaft, 2 intermittent shafts, and one spindle shaft).

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zaveri

Member • Nov 26, 2012

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sorry dude, did not see your profile properly, and mistook you for an electronic guy. by the way thanks for your reply.

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