With a simplified structure. Water pump bearing are a double support auto bearings without the inner ring hold. They feature a groove for a rolling element. Directly made on the shaft while the outer rings of its two bearings are combined and closed by rubber seals.
Water pump bearings consist of two design types:
1) The ball-ball which has two rows of balls
2) The ball-roller which has one row of balls only (a one-row roller). In the same loading capacity conditions, the radial dimensions are usually lower compared with heavier loading capacity conditions.