I was wondering (again)

[TWINSET]

How do 2 speed (or 3) gears work on modern cars?

From photos it looks like both pinions are meshed with their respective spurs anyway, so how do they changed gear?[:I]

[miramar]

Oneway bearing for the large spur and centrifugal clutch for the small spur. Both pinions are fixed on the same axle. When starting, the oneway bearing will "grip" the axle and power will transferred by the small pinion and large spur. As rpm increases, the centrifugal clutch of the small spur will engage, the oneway bearing of the large spur will glide on the faster rotating axle as power is transferred by the large pinion and small spur.

[TWINSET]

Cheers Miramar[]

[bholio]

Thanks.

(I've been wondering that myself)

[Oldschooltamiya]

Very good[8D]

We really need a new forum called "ask miramar" []

maybe it could be in the FAQ

Thanks for all the info,

Steve

[TWINSET]

All we need is his phone number - it'd save a lot of typing[]

[WillyChang]

quote:

Originally posted by miramar

Oneway bearing for the large spur and centrifugal clutch for the small spur. Both pinions are fixed on the same axle. When starting, the oneway bearing will "grip" the axle and power will transferred by the small pinion and large spur. As rpm increases, the centrifugal clutch of the small spur will engage, the oneway bearing of the large spur will glide on the faster rotating axle as power is transferred by the large pinion and small spur.

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id="quote">id="quote">

These are the "expensive" ones. []

The cheaper ones have a cam/arm instead of the clutch. Centrifugal force throws the cam out and that engages against a notch in the clutchbell.

The changepoint is adjustable... springs hold the clutch or cam in (against the force) and there's a screw that adjusts the spring's loading.

HPI's site is always good for a browse:

http://www.hpiracing.com/graphics/instr/a297.pdf