Sprint motor
Flecc,
No, have a look at the picture below.
The orbital gears engage in the black coloured ring gear. What isn't obvious from photos is that the ring gear is not fixed inside the hub. It can rotate relative to the wheel (in one direction at least).
The black coloured ring gear forms the side of a shallow steel cup. You are looking into the cup in the photo. All of the black colour is this heavy steel item. The bottom of the cup is pierced at the centre and the outside race of the sprag clutch is interference fitted into this bore. There is a peg between the bore of the cup and the outside race to transfer the torque.
The inside race of the sprag clutch is interference fitted onto a thin-walled steel sleeve, visible in the photo. The sleeve extends out of the far side of the sprag clutch and is rigidly attached to the wheel.
There is another bearing inside the steel sleeve. The stationary axle passes through the bore of this bearing so the wheel and sleeve and inner race of the sprag clutch can turn freely on the axle.
So, in the particular motor I've taken apart, the sprag clutch is between the orbital gears and the wheel.
I've just checked and I believe it is possible to feel more drag on the Quando than the Chopper just by turning the wheels by hand.
I've tried spinning the wheels by hand and recording the time to stop. Not a very exact measure of drag I suppose, but the best I could get from the Quando with a firm push on the spokes was 19 seconds, whereas the Chopper's Sprint motor manged 59 seconds.
Peter
Flecc,
No, have a look at the picture below.
The orbital gears engage in the black coloured ring gear. What isn't obvious from photos is that the ring gear is not fixed inside the hub. It can rotate relative to the wheel (in one direction at least).
The black coloured ring gear forms the side of a shallow steel cup. You are looking into the cup in the photo. All of the black colour is this heavy steel item. The bottom of the cup is pierced at the centre and the outside race of the sprag clutch is interference fitted into this bore. There is a peg between the bore of the cup and the outside race to transfer the torque.
The inside race of the sprag clutch is interference fitted onto a thin-walled steel sleeve, visible in the photo. The sleeve extends out of the far side of the sprag clutch and is rigidly attached to the wheel.
There is another bearing inside the steel sleeve. The stationary axle passes through the bore of this bearing so the wheel and sleeve and inner race of the sprag clutch can turn freely on the axle.
So, in the particular motor I've taken apart, the sprag clutch is between the orbital gears and the wheel.
I've just checked and I believe it is possible to feel more drag on the Quando than the Chopper just by turning the wheels by hand.
I've tried spinning the wheels by hand and recording the time to stop. Not a very exact measure of drag I suppose, but the best I could get from the Quando with a firm push on the spokes was 19 seconds, whereas the Chopper's Sprint motor manged 59 seconds.
Peter
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