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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Discussion and disposal of the crankshaft cracking of the initiator Analysis and treatment of the origin of crankshaft cracking
A CPB14RHH Japanese heavy-duty truck; the launcher model is Japan Nissan NE6; the third cylinder connecting rod is ablated due to the smooth oil edge when it travels 300,000 km; the crankshaft is not damaged by the flaw detector; Correction of the initiator. When traveling about 20,000 kilometers; the crankshaft cracks at the third cylinder connecting rod journal and the fourth main journal joint; we think that the traffic is poor; the crankshaft can not accept extra load after the crankshaft is enlarged; It is often formed by extra cargo or even overloading. Therefore, a new crankshaft is replaced. After more than 20,000 kilometers, the crankshaft is cracked at the joint between the second cylinder connecting rod journal and the third main journal; this incident leads to ours. Pay attention. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
1 The edge of the crankshaft cracking is summarized by the origin of the crankshaft cracking. The general conditions are as follows:
Overload travel; the initiator is often in high speed or overspeed working condition; high speed travel; often sudden braking; poor road conditions; improper operation of the driver; uneven crankshaft material; poor fatigue resistance; Poor; the main bearing loose; the main bearing housing deformation 2 analysis and detection 2. 1 inquiry based on the above reasons for crankshaft cracking; we talk with the driver and deputy; carefully know the use of the car; driver feedback After the car was modified, the launching machine was powerful and sounded. The illusion was to ease the ground and air. Recently it was running on the city road; the speed was not fast; there was no appearance of the brakes; the driver was the car of our company for 20 years. The old driver; experienced driving experience. And according to the recent operating conditions of our company, it can prove the facts of the above discussion. Therefore, it can eliminate the reasons such as “overloading, sudden braking, poor road conditionsâ€.
2. 2 detection In addition to the above "crankshaft raw material unevenness; poor fatigue strength" is temporarily unable to detect; after the initiation of the machine dissection, the cracking of the joint from the crankshaft investigation; no old scars; the connecting rod bearing and the connecting rod tile contact surface wear normal ; see the main bearing tile; remove the main bearing tile cover; tighten the bolt according to the specified force; measure the aperture with a dial gauge; the error is less than 0. 01mm; but the third and fourth seat holes There is a little scratch mark; then remove the main bearing tile cover; according to the oil passage hole as the reference; use the steel ruler to measure the seven-hole error; find that the three or four holes are different from the other holes by 0. 5mm. It can be seen that the crankshaft is cracked. The cause is caused by the scratch of the hole seat and the deformation of the hole.
3 Correction and disposal The vehicle has traveled nearly 400,000 kilometers; it is considered to be near the end of the period; if it is to replace a new cylinder; it is not economical to think from the economic point of view. But from the perspective of the overall function of the car; the car also has value Therefore, we have adopted the machining method: purchase a new crankshaft; the main bearing housing bore of the cylinder is 2mm larger; according to the 2mm crankshaft hole seat; a pair of thickened 2mm spindle bush is made from the head; the inner diameter is based on the crankshaft standard After processing, the initiator has been revised for more than 40,000 kilometers; it is evaluated from the sound, smoke color, power and fuel consumption of the initiator; the car is functioning normally.
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1. Waterproof
The aluminum profile of the cabinet door is made of aluminum alloy frame inlaid with crystal steel plate. The aluminum alloy profile, ABS plastic parts and crystal steel plate are bubble resistant materials. Therefore, the aluminum profile of the cabinet door provides 50 years of waterproof guarantee, which can be directly washed and soaked with water.
2. Fire prevention
The aluminum profile of cabinet door has strong heat resistance. The test shows that it can withstand the temperature difference of 200 ℃ without damage. Even if the whole piece is placed on it after being ignited, its surface will not be damaged after burning for a long time, which overcomes the disadvantage that ordinary plates can not stand burning.
3. Insect and ant prevention
The aluminum profile of the cabinet door is extremely hard, and even termites have nothing to do.
4. Impact resistance
The aluminum profile of cabinet door has strong impact resistance. The experiment shows that it can withstand the test of 227g steel ball falling from 3m without damage, and the bending strength is 150MPa.
5. Wear resistance
The surface of aluminum profile of cabinet door is not damaged by knife cutting. It can be used under normal conditions for 50 years.
Source: China Bearing Network Time: 2013-04-23