splines, slip yoke, and vibration question
11-12-2014, 12:27 PM
#1
splines, slip yoke, and vibration question would like an engineering response to the following:
if a slip yoke fits loosely on a rotating splined shaft, will that result in vibration?
the context is a drive shaft in a car having a universal joint on each end, with the slip yoke sliding over the transmission output shaft.
with a u-joint on each end of the drive shaft, the operating angle at each has to be the same to cancel out vibration, or so it is said.
my understanding is when there is some operating angle at a u-joint other than zero, the rotation of that "cardan joint" becomes more elliptical which causes the vibration, so having the operating angle the same at the other end of drive shaft cancels out that vibration. and as operating angle increase, and the greater difference between the two operating u-joints (phase angle) and greater rotation speed all increase magnitude and frequency of vibration.
ideally you set your pinion angle such that the phase angle is zero between the two u-joints. so if that were truly the case then if the transmission yoke fits sloppy on the transmission output shaft will that or can that be a cause for vibration?
do the type of splines on the slip yoke or output shaft matter regarding vibration? can one type of spline prevent vibration from happening, or allow for a sloppy mating of yoke to shaft?
what type of splines are cut into slip yokes and into the output shaft of the transmission?
http://www.gearsolutions.com/article...inside-splines
by sloppy i mean with slip yoke fully on shaft you can push up/down left/right on the yoke 0.030" up to 0.100" and make it click and feel obvious movement of the slip yoke. This is with the yoke that's fully on the shaft, with not more than half an inch of travel before yoke bottoms out on something against the transmission... so the yoke is fully on the output shaft.
if a slip yoke fits loosely on a rotating splined shaft, will that result in vibration?
the context is a drive shaft in a car having a universal joint on each end, with the slip yoke sliding over the transmission output shaft.
with a u-joint on each end of the drive shaft, the operating angle at each has to be the same to cancel out vibration, or so it is said.
my understanding is when there is some operating angle at a u-joint other than zero, the rotation of that "cardan joint" becomes more elliptical which causes the vibration, so having the operating angle the same at the other end of drive shaft cancels out that vibration. and as operating angle increase, and the greater difference between the two operating u-joints (phase angle) and greater rotation speed all increase magnitude and frequency of vibration.
ideally you set your pinion angle such that the phase angle is zero between the two u-joints. so if that were truly the case then if the transmission yoke fits sloppy on the transmission output shaft will that or can that be a cause for vibration?
do the type of splines on the slip yoke or output shaft matter regarding vibration? can one type of spline prevent vibration from happening, or allow for a sloppy mating of yoke to shaft?
what type of splines are cut into slip yokes and into the output shaft of the transmission?
http://www.gearsolutions.com/article...inside-splines
by sloppy i mean with slip yoke fully on shaft you can push up/down left/right on the yoke 0.030" up to 0.100" and make it click and feel obvious movement of the slip yoke. This is with the yoke that's fully on the shaft, with not more than half an inch of travel before yoke bottoms out on something against the transmission... so the yoke is fully on the output shaft.
