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⚙️ How Car Differentials Split Speed

Follow a car through a corner to see how differential gears let the driven wheels turn at different speeds, then learn why that freedom cannot create traction.

4
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. The corner problemExplain why driven wheels need different speeds in a turn and identify the differential’s place in the axle.A corner gives the outside wheel a longer path, so a differential prevents forced tire scrub.
  2. The gears make the compromiseDescribe how the carrier, spider gears, and side gears create a balanced speed difference.Spider gears let one output speed up as the other slows around a shared carrier speed.
  3. Torque, traction, and the catchDistinguish the differential’s speed function from the traction limits of an open design.An open differential corners smoothly but can let a low-grip wheel limit useful torque; limited-slip designs add resistance or control.
  4. From gear set to moving carConnect the internal gear set to final drive, drivetrain layouts, and everyday driving behavior.Final-drive gearing and speed balancing fit into several axle layouts, all solving the same path-difference problem.

Questions this course answers

Why must the outside wheel turn faster in a corner?

The outside wheel follows a larger-radius path and covers more distance in the same time.

What do the spider gears allow in an open differential?

They allow one side gear to speed up while the other slows down.

What is the main weakness of a basic open differential?

The low-grip wheel can reach its traction limit while the differential still handles speed differences.

What does a limited-slip differential add?

Its clutches, cones, helical gears, or braking control can bias useful torque while preserving some speed difference.

What is the carrier’s ideal relationship to the two axle speeds?

In an ideal symmetric open differential, the outputs balance around the carrier speed.

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