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Mengjuan Zhu

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Mengjuan Zhu last won the day on August 10 2018

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  1. According to the engineer's statement of Feilong Jiangli .Automobile water pump is the key component of the engine cooling system. One end of the pump bearing inputs torque through the pulley, which drives the other end of the blade to rotate. In order to meet the development requirements of high power and high efficiency of the engine, higher performance requirements for pump bearings are put forward. Fracture, corrosion, peeling and grease leakage are common failure modes of automobile water pump bearings. Fracture is the most harmful. Therefore, it is necessary to analyze the failure modes
  2. Engine cooling water pump is the main part of the cooling system of automobile engine. Its function is to force the cooling fluid in the engine to circulate in the cooling system and reduce the influence of high temperature on the engine during the working process of the engine. Water seal is the core of the work of the pump. The movement of the water seal itself is very simple, just rotates with the shaft. . Water seal, pump body and bearing are super-hard matching mechanical seals. This kind of seals is composed of static rings and dynamic rings, which are perpendicular to the shaft, and the
  3. When the pump is damaged, we should pay attention to the following items when replacing. (1) The real cause of the pump damage should be clear. Before replacing the pump, the radiator fan, thermostat and coolant should be determined. (2) It is likely that pumps with similar shapes but suitable for different types of engines will occur, so before installing the pumps, a comparison should be made between the new pump and the old pump removed, or a check should be made on the part number of the pump and the type of the engine to determine whether the selected pump is suitable for th
  4. It is unavoidable that the breakdown of the automobile water pump is in use. Common faults are as follows: (1) Bearing locking and fracture The causes of bearing failure may be the following aspects: bearing itself quality defects; bearing excessive impact load; product structure design defects; improper pump installation (such as knocking installation, belt tension, etc.) (2) Leakage of installation surface The possible reasons for leakage of installation surface are as follows: uneven application of sealant, resulting in leakage of seam; improper installation of seali
  5. One of the categories of automotive rubber products is belt products. Belt products are mainly used in automobiles to transfer torque power and speed, power from the power source engine to the need for power systems and places. It is installed in cooling fan, cooling water pump, brake compressor, booster pump, air conditioning system and steering system. The car belt is mainly V belt. Usually there are three kinds, that is, wrapped V belt, cutting V and multi wedge belt to cut W belt. Cutting V-belt has no coating on both sides, good flexibility, friction coefficient, with a large force,
  6. Due to the limitation of installation space and performance requirement, automobile engine cooling water pump has the characteristics of small volume, simple manufacture, and is conducive to mass production. The cooling water pump is usually made up of main parts such as pump body, impeller, shaft, bearing, water seal and pulley. According to the different structure of the engine cylinder block, the pump pressurized water chamber can be integrated on the engine cylinder block, and the impeller can also be separately configured as the core functional components of the pump, its diameter, o
  7. Automobile rubber products are indispensable components in automobile parts. According to the different types of cars, each car needs to install about 100-200 kinds of rubber products, to use more than 200-500 rubber accessories. In addition to tires, different sizes of cars vary, and the consumption of rubber materials is about 15-60 kilograms. A car's rubber products (excluding tyres) account for about 6% of the total vehicle cost. There are more than 1000 kinds of non tire rubber products in automobile industry, and there are about 8000 specifications. According to statistics, the automotiv
  8. This power assembly mounting arrangement design uses more mature left, right engine side and transmission side three-point mounting arrangement, are rubber mounting. In the road test of NVH performance of mounting system, one measuring point (three-way sensor) is arranged on the active side (i.e. connecting engine side mounting bracket) and the passive side (i.e. connecting body side mounting bracket) of each mounting. The noise measuring points are located in the driver's right ear, the right ear of the non-left seat and the right ear of the rear left seat respectively. Set up a measuring poi
  9. Test steps (1) oil release: unscrew the oil bolts and put the oil in the right container. If all the oil in the oil pan can not be dried through the oil drain bolt hole, the remaining lubricating oil in the oil pan must be drained through the oil pumping equipment. (2) install the oil drain plug, tightening torque is generally 25±3N • m (3) refueling: oil can be added from the oil filler cap or scale pipe orifice. But if you add oil from the top of the oil filler, it takes more than 10 minutes to keep the oil flowing to the oil pan. If you add oil from the caliper nozzle, the
  10. When calculating the scale of the oil scale, it is best to choose the flange face of the ruler tube. The reason why the flange is chosen as the measuring reference is that the ruler's position in the engine is completely determined by it. (1) B is the length of the axis of the ruler. After the scale tube is arranged on the engine, it can be directly measured from the digital module. (2) C is the length of the ruler tube inserted into the flange installation surface. The length is set according to the length of the ruler. If the condition is allowed, it is best to keep the ruler
  11. (1) Complete the modeling of the oil storage space in the lubrication system according to the relevant parts of the lubrication system. (2) Through the automatic measurement function of ProE software, the oil storage volume of oil pan is cut to find the defined volume at the normal loading angle. It is assumed that the maximum oil injection amount of an engine is 5L (3) Assuming that the ruler's direction in the ruler tube is consistent with the direction of the ruler tube, the mark value of the maximum scale of the oil scale is to select (2) the intersection point of the middl
  12. The measuring rod part of the oil gauge generally has three structures: steel wire, steel belt (Bian Chi), and many winding wires. Among them, spring steel wire is commonly used in steel wire structure, and the material is hard, which is suitable for the relatively slow bending ruler tube. The multi strand wire is easy to insert and plugged in the bending scale tube, but the price is higher. The material of flat ruler generally chooses 0.8mm~1.2mm stainless steel strip, and the price is relatively low. As the core part of the ruler, the head of a ruler is the most important part of the ruler.
  13. The oil dipstick is a common part in the engine lubrication system. Its core function is to ensure that the oil of the engine oil bottom is in a reasonable range, and also has the function of sealing the crankcase and providing support for other accessories. Although the structure is simple, it is essential on the engine. Oil gauge is widely used by automobile manufacturers at home and abroad because of its cost advantage over oil level sensor. The oil dipstick is usually used in combination with the ruler tube, so that the user can easily understand the oil level in the engine and ensure the
  14. The motor torque is through the silicon (stator) on the coil after the electricity generated magnetic field LED permanent magnet (rotor) operation. A magnetic system with a complete coupling of n (n-even)-filled magnets to make the parts of a magnet mutually integral. When the magnetic pole of the stator coil is opposite to the magnet's magnetic pole, that is, the displacement angle between the two poles is φ=0, the magnetic energy is the lowest, and the magnetic energy is the largest when the magnetic pole rotates to the same pole, i.e. the displacement angle between the two poles is φ=2π/n.
  15. According to the different driving mode, the pump is generally divided into mechanical pumps and electric pumps. Most of the engines now use mechanical pumps, and electric pumps have been used in some newly developed, technologically high engines, such as the BMW 6-series (E63) engine. (1)Mechanical pumps The mechanical water pump is driven by the engine crankshaft through the driving tape, and its rotational speed is proportional to the engine speed. The working methods of mechanical pumps have both advantages and disadvantages. When the engine is working under high speed and he



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