Cosworth 4x4 fordelingskasse. oppgradere viscoclutchen til fordeling., Noen som har tatt billigmetoden.å boltet fast hele clutchsystemet

[dohcboy]

såpass men d som er så rart er at den funka helt normalt idag :S men kan jo hende d er pga at kassa er kald ?

[BR Racing V6]

Her er hva de skrev på Passion ford forumet. det ble litt enklere å forstå:

 

The drive is taken into the epicyclic through the planet carrier.

The planet gears have 13 teeth

The rear output anulus has 58 teeth

The front output sun has 32 teeth

 

So you have a rear output ratio of 13/58, and a front output ratio of 13/32,

or 4.46:1 versus 2.46:1

 

Wont bore you with the maths, but you end up with 0.64reccurring to the

rear, and 0.35reccurring to the front.

The viscous coupling connects between the sun and the annulus to PROMOTE

equal drive between the two.

 

The VC isn't designed to lock. There are a series of fine plates immersed in

a viscous silicon fluid.

VCs are rated dynamically, for example; 50NM/SEC. That is; You will need to

apply 50NM to gain a slippage rate of 1 revolution per second, or 60 rpm.

50NM/sec is a typical first upgrade to an MT75 centre VC.

For a torque to occur, you need an equal and opposing load.

By removing the front prop, the load is removed from the centre differential

sun gear. The planets, faced with a load at the annulus, versus an easy life

at the sun, will choose to simply spin the latter, revolving inside the

stationary annulus. Yes, there is the VC providing some encouragement to

drive the two at the same rate, but unless the VC is rated to pretty much

match the available torque at the planets against the load of the vehicle,

you will simply "fry" the VC.

Remember, if you have, say, an engine capable of supplying 300NM, then in

1st gear, with a reduction of 3.3:1 (from memory on an MT75), you will have

an available torque of 990NM

 

 

no - when all wheels have equal grip and rotate together, the sun and

annulus rotate at the same SPEED, and in this condition the VC does nothing,

as both sides of it are rotating at the same speed too.

The gear ratios between the sun/planets and planets/anulus create the TORQUE

split, not a SPEED split - however the epicyclic gear assembly does allow

differential speed to occur between sun and anulus (ie front and rear prop,

when there is loss of grip at one end), this is when the VC starts working

as it now has both halves moving with respect to each other which

effectively causes 'drag' if you like, between the front and rear outputs,

which is the bit Bernie refers to as 'promoting' equal drive.

 

Remember, the centre diff action (the epicyclic gear assembly) is TORQUE

sensitive, whereas the VC is SPEED sensitive. Apart from the viscous 'drag'

effect when the front and rear shafts turn at different speeds during

front/rear slippage conditions, the VC plays no part in the torque split

front-to-rear.

 

Rear toothcount is 13/58

Front toothcount is 13/32

To work out the relationship we must first convert to fractions of the same

total, so:

Multiply out the fractions to get 416/1856 and 754/1856 (58x32, 13x32,

13x58)

Now we have a relationship.

Add 416 and 754 together which forms our whole: 1170.

Now divide 416 by 1170 = 0.3555555555555555555555555etc

Divide 754 by 1170 = 0.64444444444444444444444etc

 

To achieve a 50:50 split you would need double planets, which are

effectively two sets of planets in the same carrier.

One set will mesh with the annulus, with the other meshing with the sun.

Toothcounts are monkeyed with to achieve identical ratios

For example: 20/40 is the same ratio as 15/30 (2:1)

 

 

.46/(2.46+4.46)=35.5 %

and

4.46/(2.46+4.46)=64.4%

[dohcboy]

er d noe hokus pokus å skifte viskosen i ei T9 fordelings kasse.. er så DRITT lei 4x2 drift nå. dvs på kaldt drivverk virker den som den skal.

[Tore_TJ]

Noen som "pumper opp" viscosen til 60nm her i norge da? vet bara gjør det men litt stress å sende til england når jeg ikke har en reserve viscose..