(hit the 2x) This is a Cardan Joint (or Universal Joint). Its velocity is not constant -- check out the attachment to see the math describing the variation in speed.
Universal joint 1 || animated mechanism || Download free 3D cad models #100024
Axles of the two shafts may be 1. Parallel and coincident 2. Parallel and distinct (with eccentricity) 3. Intersecting 4. Skew It is a constant velocity joint for cases 1, 2 and 3.
Universal Joint shaft coupling
Two different universal joint shaft couplings connect a motor to a worm gear. One the two designs works better than the other one. I designed in in OpenSCAD ...
Understanding Universal Joint
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Symptoms of a Bad or Failing Universal Joint (U-Joint) | YourMechanic Advice
Common signs of a faulty u-joint include a squeaking noise, clunking sound when shifting, vibrations in the car, and transmission fluid leaking.