Sunday, Aug 05, 2018 at 18:38
Diff gears are quite capable of withstanding serious power in reverse. How many gear sets do you hear of being busted, simply by reversing under power whilst bogged? Very, very few.
All automotive diff gears are hypoid (helical spiral bevel), where the pinion shaft is offset,
well below the centreline of the axles.
This results in a helical gear tooth which actually slides along its mating tooth on the other gear, to a certain degree.
The hypoid diff gearset has the advantage of being stronger than a regular spiral bevel gear set (where the pinion shaft is in line with the axle centreline) - because the teeth are curved, and therefore provide more inherent strength than a straight tooth, as in a regular spiral bevel gear set.
The hypoid gearset also offers advantages in vehicle design, because it reduces the diff "hump" profile, due to the ability to utilise a smaller diameter bevel (ring) gear.
As far as getting out of bogs (and I've been bogged aplenty), you are nearly always better off going straight out backwards, rather than trying to turn around, and go out forwards.
The reasons being - going out backwards, you're travelling back over tracks you've already made (instead of trying to make new ones).
Going forward usually only means you're going further into more unstable or softer ground - and trying to make new tracks, whilst doing so.
There are a few cases where you keep going forwards - when the ground behind you is softer or more unstable than the ground in front - or when someone else is bogged behind you!
Cheers, Ron.
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