Roller bearing composed of two or more bearing structures simultaneously in a set of bearings. Such as needle and thrust ,cylindrical roller bearing, needle and thrust ball bearing, needle and angular contact ball bearing.
Other bearings: rolling bearings of other structures other than those mentioned above.
Sliding bearing: sliding bearing is not divided into the inner and outer ring and there is no rolling body, which is generally made of wear-resistant materials. Often used for low speed, heavy load and lubricating oil and difficult maintenance of mechanical rotating parts.