Is splined shaft suitable to simultaneous axial and rotational motions? 2

[Ivan Silva]

Hi folks, I have been working as a draftman in packaging machine industry. I've been studying lots of mechanism to learn a bit about machine design. Sometime ago I met the spline shaft and reading about it I learned that it is suitable for rotational and axial motion although I an question stay on my mind. Are splined bushing and shaft suitable in application which the combined axial and rotation motion is not a intermittent movement? I meaning is this suitable for 400rpm and 400mm/sec constant combined motion for example? Is there another substitute mechanism for that situation?

 

[3DDave]

It depends. Lubrication is the main issue.

 

[mfgenggear]

here is a good read about spline shafts

https://gearsolutions.com/features/the-benefits-of-splines/

 

[mfgenggear]

Ivan Silva
the spline shafts I have worked with were for torque rotational transfer, from one component to and other. there a few that use axial rotation. bot not both. up to 10K RPM for rotational transfer.

 

[Ivan Silva]

3DDave, thank you for reply! If think lubrification is not an issue if done it right. My worries is about the application itself. I know the spline is widely used in drills, clutch etc although in all that applications the axial movement is intermitent I would like to know if the splined shaft can be design to work over several hours per day...

See the video below. My idea is used an splined shaft in the capper head which is showed on the video:

https://youtu.be/GiugzLkIFD8?t=163

 

[hydtools]

Rotation of rock drills is done with rifle bar drive, a form of both rotary and axial drive.

Ted

 

[mfgenggear]

https://www.eng-tips.com/viewthread.cfm?qid=292680

 

[dvd]

Something to consider when splines slide is axial forces generated through torque transmission -

This is from literature of -

https://www.johnsonpower.com/

- for those in the market for universal joint/cardan shafts.

 

[Jacc]

Not exactly splined but with the same functionality, PTO shafts for farm tractors come in different sizes.
Just google PTO shaft.

 

[romke]

What exactly do you mean with constant axial motion? Continuous motion in the same direction, or a movement first in one direction and then reverse the direction for a equal amount of travel combined with rotation under load? If the direction of axial travel is changed frequently you might well run into difficulties resulting in mechanical wear (depending on load)unless you are able to separate the spline and the bushing through some type of lubricant. That could be quite difficult to achieve, because at the extreme points of the movement where the direction of the movement is reversed there is a momentous loss of relative speed which makes it very difficult to separate bushing and spline through lubrication.