With simplified structure, water pump bearings are 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.
