hp loss

[Greg Hermann]

>Of course a hypoid has more friction than a bevel gear but how much?
>Viscous drag from the lube also has a great influence and is greater with a
>hypoid.  I suspect the differences between hypoid and bevel are measurable
>but small.
>
>Gary Derian <gderian at oh.verio.com>

Well- a hypoid does have sliding contact between the gear teeth, where a
bevel, even a spiral bevel does not (all rolling tooth contact with these).
So there should be at least a LITTLE more friction in a hypoid. The sliding
contact is the whole reason why you need the EP additives in the gear oil
for hypoids.

Greg
>
>>>
>>>A big factor is the rear axle gearset and especially if it is a hypoid
>>>design and also [I think] how much the actual offset is between the ring
>>>and pinion centreline; the greater the offset, the longer the pinion tooth
>>>becomes, thus increasing friction. I notice spiral bevel gearsets coming
>>>back into production and I believe it is because of the greater drag of
>>>the hypoid design.
>>
>>Yep!!
>>
>>Greg
>>