What are the components of the combined roller bearing?

What are the components of the combined roller bearing
1) Main roller
The main roller is the main bearing body of a set of composite rollers, which mainly bears the vertical load and impact load, and has strong impact resistance, wear resistance and corrosion resistance. As the main roller is full loaded roller bearing, it can also be used as one-way bearing.
2) Side roller
The side roller is the second bearing body of a set of composite rollers, which mainly bears the horizontal load, and also has strong impact resistance, wear resistance and corrosion resistance. The side roller is designed with full needle without inner ring, and a mandrel is used to replace the inner ring and connect with the shaft head to carry the load.
3) Shaft head
The shaft head is used as the connecting part between the compound roller and the machine equipment. Generally, the shaft head is designed with chamfering, which is convenient for installation. The shaft head can be directly welded on the equipment, or the shaft head can be welded on the connecting plate with round hole, and then the connecting plate and the equipment can be assembled.
4) Cover plate
The cover plate is an important part of fixing the side roller inside the shaft head and the main roller outside the shaft head at the end of the shaft head with nuts and screw glue.