A variable velocity universal joint changes speed every how many degrees?

Prepare for the Automotive Service Technician Period 1 exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

A variable velocity universal joint changes speed every how many degrees?

A single universal joint does not transmit motion at a constant velocity because the cross and yokes create a changing geometry as the input shaft rotates. This causes the driven shaft to speed up and slow down during each turn. The velocity variation repeats in a cycle that occurs every 90 degrees of input rotation, so the speed changes at every quarter turn of the input. This is why, without a true CV joint or properly phased two joints, the drive shaft ends up with fluctuating speed.

A single universal joint does not transmit motion at a constant velocity because the cross and yokes create a changing geometry as the input shaft rotates. This causes the driven shaft to speed up and slow down during each turn. The velocity variation repeats in a cycle that occurs every 90 degrees of input rotation, so the speed changes at every quarter turn of the input. This is why, without a true CV joint or properly phased two joints, the drive shaft ends up with fluctuating speed.

More practice questions