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By 袁春凤 (Tiffany)
The measuring rod part of the oil gauge
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. In the drawing, it is easy to rub with the ruler tube that matches with it. The particles produced by the friction will fall into the lubricating oil. The unclean lubricating oil will cause great wear to the bearings of the engine. In the indicator part of the scale, the head can be designed as a roller structure, which is not only effective. The scale has reduced the tube pulling force of the ruler and reduced the scraping of the ruler head and the ruler tube.
For the oil gauge with steel strip structure, in order to make the gauge clearly indicate the position of the liquid level, it is easier for users to read the oil gauge. Generally, the head of the flat ruler is treated with sand blasting or press mesh, and some rhombic pits can be set on the head of the plastic. These pits are disconnected from each other, so that the oil can climb up the trough under the siphon effect, which affects the accurate reading of the scale.
By Charlie Duan
The rubber material determines the service range and service life of the rubber soft connection. Different rubber materials correspond to different medium environments, and the use of rubber materials not suitable for pipeline circulation media greatly shortens the use effect of the rubber soft connection, which may also have a great impact on the service life of the whole pipeline. Chongqing Feilong Jiangli has many years' experience in manufacturing rubber auto parts. Pls feel free to contact me if you have any interest in us. [email protected]
By Mengjuan Zhu
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 to protect the head of the ruler, so that the measuring head of the ruler is parallel to the wall of the ruler, and the scraping of the scale section of the ruler is reduced.
(3) D is the value from the flange surface to the maximum scale, corresponding to L1 in Figure 6. Similarly, the value from the flange surface to the minimum scale is L2.
It is easy to get the theoretical distance of the ruler: the distance between the handle of the ruler and the mouth of the ruler to the maximum level of the level of the level of the level of the oil level: AMAX=B-C+L1, the same, the distance between the yardstick and the ruler's pipe mouth to the minimum level of the level of the level of the oil level: AMIN=B-C+L2.
By Mengjuan Zhu
（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 middle line of the liquid level and the ruler tube. Note the distance from the flange flange to the maximum liquid level from the scale tube L4.
（4） similarly, according to steps (2) and (3), the measured minimum oil capacity is defined L2
L1 and L2 are the values of maximum liquid level and minimum liquid level calculated by scale theory.
By Charlie Duan
Structure of water pump
The water pump used in automobile engine is centrifugal water pump, which consists of shell, impeller, bearing, pump shaft, water seal and transmission belt wheel.
(1) water pump housing is made of cast iron or cast aluminum.
The wall of cast iron case is thick and its quality is large. With the improvement of the requirement of engine lightweight, only some large engines of commercial cars are still using the pump of cast iron case.
Many cast iron cases also have some water channels and thermostat installation rooms, which further increase the weight of the case.
Most water pumps in cars use cast aluminum shells, and the size of the shells is getting smaller, many of the shells no longer have the function of water channels.
(2) the impeller of the impeller pump is made of metal or engineering plastics, such as cast iron. The impeller is made of semi-circular arc, double circular arc or multi-circular arc blades that bend backwards.
Pump impeller made of cast iron is of high quality, but its mechanical strength is high.
The plastic impeller is easy to realize miniaturization and lightweight, and has good corrosion resistance and easy shape processing. Therefore, more and more car engine pumps use plastic impeller.
(3) bearing water pump bearing is an important part of water pump, and the failure of a considerable part of water pump is caused by the damage of water pump bearing.
As the engine gradually develops towards high power, the pump bearing needs to have higher thermal stability, greater bearing capacity and better sealing, so some automobile pumps use axial bearing.
Shaft bearing is actually a kind of double supported bearing with simplified structure. Two supporting bearings have no inner ring. The raceway of the rolling body is directly processed on the pump shaft.
Under the same bearing capacity, the size of shaft bearing is smaller than that of general type bearing.
Under the condition of the same size, the bearing capacity of shaft bearing is greater than that of general type bearing.
(4) pump shaft pump shaft is generally made of forged steel.
The pump impeller is installed on one end of the pump shaft, which is supported on the pump housing by bearing.
The other end of the pump shaft is equipped with a transmission belt wheel, which is driven by the engine crankshaft through toothed tape or v-shaped tape.
(5) water seal is used to seal the cooling fluid so as to avoid leakage. Meanwhile, the cooling fluid is separated from the pump bearing to protect the bearing.
At present, two-layer ceramic water seal has been widely used in water pumps. Two ceramic water seals installed on the same axis are pressed together by a spiral spring.
Compared with rubber water seal, ceramic water seal is more wear-resistant and has a longer service life, but it is also prone to abrasion by hard particles in the cooling fluid.
Although the processing of water seal has been improved continuously, water seal damage caused water pump leakage is still the main reason for water pump damage.
(6) according to the tooth shape of the belt, the belt wheel can be divided into toothed belt wheel and v-shaped belt wheel.
With less and less transmission tape on the engine, more and more pumps share one toothed belt drive with generators, air conditioning compressors, steering pumps, etc. Therefore, more and more toothed transmission belt wheels are added.