Location for auto grease lube on linear slide bearing 1

[marmecheng]

I am trying to determine the best location for an automatic grease lubrication system on a linear sliding journal bearing (correct name??). It is a large shaft travelling linearly at relatively slow speeds (10-20 ft/min) through a fixed smooth journal/bush. Where is the best location for a grease injection hole? I would assume underneath where the load is carried would be ideal; however, blockage and pressure becomes an issue. Is on top or on the side more appropriate; without a rotating element will grease be entrained under the shaft?

Thanks for the insight.

 

[rnd2]

It is important to remember that provided there is always sufficient supply, grease will stick to and drag between sliding surfaces. Your job as designer is to identify and set the design conditions to enable this.
I would consider internal circumferential grease grooves approximately 10% in from each end of the bearing and connected to a common grease entry hole.

 

[rnd2]

This method ensures the linear bearing is always able to "ramp" over a fresh supply of grease no matter which direction it is travelling.