The necessity of prevention of failure mode of automobile water pump bearing

Automobile water pump bearing manufacturers briefly introduce why they should prevent the failure mode of automobile water pump bearings.

      In order to meet the development requirements of high-power and high-efficiency engines, automobile water pump bearings put forward higher performance requirements for water pump bearings. The automobile water pump is a key component of the engine cooling system. It inputs torque through a pulley at one end of the water pump bearing and drives the impeller at the other end to rotate.

      Corrosion, fracture, peeling and grease leakage are common failure modes of automotive water pump bearings. Among them, fracture is the most harmful, so it is very necessary to analyze the failure mode of automobile water pump fracture and formulate corresponding preventive measures.

     What are the requirements for the utilization environment of shaft bearings

     The selection of specifications, dimensions and accuracy according to the utilization location, utilization conditions and environmental conditions, and matching of suitable bearings are the prerequisites for ensuring the life and feasibility of the bearings.　

1. Use parts: Tapered roller bearings are actually used to withstand the combined radial and axial loads based on radial loads. Usually two sets of bearings are paired for use. The tension should be applied to the front and rear wheel hubs, active bevel gears, and differential speeds of automobiles. Transmission parts such as gearboxes and reducers.

　　2. Allowable speed: In an environment with precise placement and good lubrication, it is allowed to be 0.3-0.5 times the limit speed of the bearing. In the normal environment, 0.2 times the limit speed is the best.

　　3. Allowable tilt angle: The tapered roller bearing usually does not allow the shaft to tilt relative to the housing hole. If it is tilted, the maximum is not higher than 2′.

　　4. Allowable temperature: Under normal load, the lubricant has high temperature resistance, and the lubrication is sufficient, the normal bearing is allowed to work at an ambient temperature of -30℃-150℃.

Automotive water pump bearing manufacturers share with you why the temperature of automotive water pump bearings is too high, then let’s take a look at the reasons?

 The first possibility is that the static balance of the water pump rotor is not good. The radial force of the water pump rotor increases and the bearing load increases, causing the bearing to heat up.

 The second water pump will vibrate when operating under non-design point conditions, which will also cause the water pump bearings to heat up.

 The third water pump shaft is bent or out of concentricity, which will cause the water pump to vibrate and then cause heating or wear of the bearing.

 The fit clearance of the fourth bearing does not meet the requirements. If the fit between the inner ring of the bearing and the water pump shaft, the outer ring of the bearing and the bearing body is too loose or too tight, it can cause the bearing to heat up. (Too tight fit will make the bearing inflexible; too loose fit will make the inner ring of the bearing rotate or the entire bearing will rotate in the bearing body).

 Fifth, because the axial thrust of the water pump bearing increases (for example, when the balance plate and the balance ring in the water pump are seriously damaged), the axial load on the bearing is increased, which causes the bearing to heat up and damage it.

 Sixth, the amount of lubricating oil (grease) in the sixth bearing is insufficient or excessive, the quality is poor, and there are debris, iron filings and other debris; the sliding bearing sometimes causes the bearing to heat up because the oil ring does not rotate and does not bring the oil.

 The seventh bearing has been damaged (including the quality of the purchased bearing itself), which is often a common cause of bearing heating, such as the damage of the rolling bearing cage, the steel ball crushing the inner ring or the fracture of the outer ring; the alloy layer of the sliding bearing peels off and falls Block etc. In this case, the sound at the bearing is abnormal and the noise is loud, so the bearing should be disassembled for inspection and replaced in time.