I Beam Trolley Bearing Type

[sbaseball]

I am having trouble finding the difference between and I beam Trolley with a roller bearing and a sleeve bearing?

I know that the roller bearing has 4 wheels that sit on the bottom base of the I Beam and roll back and forth but I am not sure how a sleeve bearing is different from that?

Thanks

 

[Mech_Engineer]

Sounds like it's describing the bearings for the wheels on the I-beam roller itself, one type having a roller bearing and the other being a sleeve bearing.

Roller bearing:

Sleeve bearing:

 

[sbaseball]

I never got to thank you for your help, but those pictures really cleared up the difference between the two bearings.

Thank you