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📘 A corner gives the wheels unequal journeys

Picture a car tracing a left-hand bend. The left tire is closer to the center of the curve, while the right tire sweeps around a larger arc. In the same few seconds, the outer tire must cover more ground. If both tires have the same diamete

3
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. The problem a turn createsExplain why the inside and outside driven wheels need different rotational speeds in a turn.Wheel paths have different radii, so a rigid axle would force scrub or slip; the differential preserves connected drive while permitting the mismatch.
  2. Inside the gearsetIdentify the carrier, planet gears, side gears, and average-speed relationship.The ring gear drives a carrier, and planet gears spin when the two axle outputs need unequal speeds.
  3. Power, traction, and trade-offsConnect differential speed freedom to final-drive ratio, traction limits, limited-slip systems, and four-wheel drive.A differential redirects and multiplies torque, but its easy speed split can need resistance or extra differentials when traction and axle paths diverge.

Questions this course answers

Why must the outside wheel rotate faster in a turn?

The outer wheel covers a greater distance in the same time, so an equal-diameter tire must rotate faster.

What do the planet gears do when a car turns?

Their self-rotation lets one side gear speed up relative to the case while the other slows down.

In an ideal open differential, what does the carrier speed equal?

The carrier speed is the mean of the left and right output speeds.

Why can an open differential struggle when one wheel is on ice?

An open design permits the low-resistance side to spin, so the other side may not receive enough useful drive.

Why can a four-wheel-drive vehicle need a center differential?

Front and rear axles trace different paths in a turn, creating a second speed difference beyond left versus right.

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