What are the reasons for the abnormal noise of automobile water pump bearings

1. Is it caused by the water seal related parts? The key components of the water pump are the water seal and the bearing. The failure of the two is mutual. If the water pump and the shaft bearing structure are designed well, the water seal will not be eccentric due to the wear of the bearing. , Leakage and abnormal noise occur (Special attention: When assembling the belt on the pulley after repairing the water pump, it must be assembled according to the belt tension specified in the instruction manual. Generally, the belt tension of a car is 350-550N. This point must be paid attention to. Otherwise, the engine will be fatal after running for a period of time). It is recommended to rotate the bearing by hand to see if there is any seizure. If not, it is a problem with the water seal design.

   2. The structural design of the water seal itself is unreasonable. At present, it is found that the defects in the design of the water seal itself cause abnormal noise. At present, most foreign water seal manufacturers (such as Japan EKK, Germany KACO) have In the analysis of the heat dissipation problem when the pump is working at high speed, the main structural improvement is made. Simply put, the design rotation direction of the improved water seal should be consistent with the rotation direction of the pump. If the bearing is rotated by hand, abnormal noise is found. Then it must be caused by the inconsistency between the rotation direction of the water seal design and the rotation direction of the water pump.

    Secondly, in order to protect your engine from good cooling, be sure to use the coolant specified in the engine manual, because the selection of coolant is very important to the matching of the engine's water channels and cooling system components.

    How to judge the car water pump is broken? The water pump is an important part of the automobile engine cooling system. The function of the water pump is to pressurize the coolant to ensure its circulation in the cooling system and accelerate the heat dissipation. As a long-running device, the water pump will fail during use.

     One is that the water temperature is high. After eliminating other causes, you can determine whether it is a pump problem.

     The second is to look at the flow of liquid in the water tank when refueling. When refueling, the water will flow, which shows that the water pump is not a problem.

     The third is to observe whether the pump is leaking, and listen to the abnormal noise of the pump.

    In addition, first observe whether the water tank is short of water (remember, it must be a cold car to open the water tank cover), the natural temperature is high when the water is lacking; then, to observe, first drive the car, hold the accelerator for a while, and observe the water temperature gauge (usually Not more than half of 70-90 degrees), if the water temperature continues to rise (for example, near the red line), if possible, touch the slightly larger water-saving pipe near the end of the water tank with your hands. If it is cooler and does not feel hot, it must be cooling There is a problem with the system! It is also necessary to determine whether the thermostat is good, whether the cooling fan is working, etc., before determining whether the water pump is damaged.

     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. Under normal conditions, 0.2 times the limit speed is appropriate.

　　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, it 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℃.