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袁春凤 (Tiffany)

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About 袁春凤 (Tiffany)

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  1. Fatigue fracture failure of automotive parts and its mechanism First, definition: Fracture of parts under alternating stress is called fatigue fracture. It is the most common and harmful way of automobile parts. In automobile, about 90% of the fracture can be attributed to fatigue failure of parts. Second,classification of fatigue fracture failure According to the characteristics of the parts and the total number of stress cycles during failure, it can be divided into crack-free parts and cracked parts of the fatigue fracture failure. When high cycle fatigue occurs, the stress is below the yield strength, and the life of parts is mainly controlled by the nucleation life of cracks. The stress of low cycle fatigue is higher than that of yield limit, and its life is greatly influenced by the crack propagation life. Generally, automobile parts are low stress and high cycle fatigue fracture. Third, fatigue fracture failure mechanism Fatigue fracture of metal parts is essentially a cumulative damage process. It can be divided into slip, crack nucleation, microcrack propagation, macroscopic crack propagation and final fracture. Feilong jiangli will update analysis of more auto parts failure models.
  2. Fretting wear and its failure mechanism Definition: There is no macroscopic relative motion between the two contact surfaces, but there is a small amplitude of relative vibration (generally less than 100um) under the influence of external variable load. At this time, a large number of Micro-Oxide wear powders are produced between the contact surfaces, so the wear caused is called fretting wear. Fretting causes damage to components in three ways; for example, fretting corrosion wear occurs when the chemical reaction between two surfaces plays a major role in fretting wear. Fretting fatigue wear is called fretting fatigue wear if micro-cracks occur on Fretting surface or subsurface layer and develop into fatigue cracks under repeated stress. Feilong jiangli will update analysis of more auto parts failure models.
  3. In 2018, the Great Wall launched the innovation of supporting operation mode, initially realizing the independent operation of the four major parts companies, and truly facing the market. Component companies combine their own business characteristics, through innovation and implementation of diversified operation mode, enhance market competitiveness, promote the overall efficiency of the group growth. According to the plan, the Great Wall will develop toward cleanliness, intellectualization, networking and sharing in the future. While improving the quality of traditional vehicles, it will increase investment in new energy, intelligence and sharing. More vehicles will be launched in the field of hybrid power and pure electric power. At the same time, more vehicles will be launched through the development of hydrogen energy technology. Green and energy-saving products. In the new energy sector, the Great Wall will launch 12 models of pure electric vehicles, plug-in hybrid vehicles and fuel cell vehicles on five platforms by 2025, including three small pure electric vehicles (ME platform), one cross-border pure electric vehicle, and two compact pure electric vehicles (beam vehicles jointly owned with BMW). ), 4 medium and large plug-in hybrid cars and 2 large pure electric / fuel cell vehicles. Chongqing Feilong Jiangli auto parts is also in line with the changes of the times and the progress of science and technology, according to the company's development planning line research and development of electronic water pumps-high efficiency pump plus thermal management valve-variable/electronic oil pump-electric water pump+TMM-TMM+
  4. On August 29, LMC, the global auto market forecaster, said global auto sales were expected to reach 97 million in 2018, but growth slowed to 1.8% year-on-year, far below the 5% annual growth rate since 2010. Since 2010, global car sales have expanded steadily at an annual rate of over 5%. Global auto sales are still relatively strong, boosted by the global economic recovery, but the outlook is starting to change. The slowdown in growth in China and Europe is the main reason for the slowdown in global car sales in 2018. The pressure of US tariff policy is the key to trigger the slowdown in the car market in China and Europe, affecting consumer confidence in many non-US markets. According to BBC analysis, the automotive industry is probably the most affected area by US trade policy so far. Ford, General Motors, Fiat and three other major auto makers have recently warned that changes in trade policy are beginning to affect performance. Among them, Ford and general motors have lowered their profit forecasts for 2018. The anticipation of a cut in car import tariffs also prevented Chinese consumption, causing Fiat's sales to decline in China, and Fiat lowered its profit forecast for 2018. China, as the world's largest car sales market, is not optimistic. According to Bloomberg News Agency in early August, China's passenger car sales fell for the second month in a row, slowing economy and tit-for-tat trade frictions between the United States and China made consumers cautious. Sales of generalized passenger vehicles, including cars, SUVs and multi-purpose vehicles (MPVs), fell 5.4 percent to 1.6 million in July from a year earlier, the National Joint Committee on Passenger Car Market Information said on August 8. Sales in the world's largest auto market have shrunk to 2% year-on-year growth since June, down 3.7%.
  5. 袁春凤 (Tiffany)

    Car body rubber parts: body rubber tube

    Car body rubber parts: body rubber tube 1.Use for car body Fuel hose: made of fluorine rubber. Oil injection pipe: nitrile rubber. Air conditioner hose: made of butyl rubber or nitrile rubber. 2. use for chassis AT oil cooler hose: propylene rubber. Power steering tube: acrylic rubber Brake hose: three yuan ethylene propylene rubber. Clutch hose: three yuan EPDM system. Hose: made of epichlorohydrin rubber.
  6. 袁春凤 (Tiffany)

    Car body rubber parts classifications

    Chongqing Feilong Jiangli tells you that the average car has more than 100 rubber parts, 200 to 500, and the rubber consumption can reach 60 kg. Automobile accessories for rubber products account for about 6% of total vehicle cost. Rubber fittings for automobiles, except tires, are small fittings, but they are all installed in key parts, such as automotive engines, gearboxes, axles and other parts of the oil seal are used, but rubber seal is the key to ensure the normal operation of these parts, for the safety of automobiles, durable use and maintenance So, rubber parts can be called "functional cells" of automobiles. 1. Hose type 1) use for engine Fuel hose: made of fluoroadhesive or Chloroether rubber. Injection control tube: made of acrylic rubber or nitrile rubber. Air duct: made of TPO or acrylic rubber. Water supply hose: three yuan ethylene propylene rubber manufacturing
  7. 袁春凤 (Tiffany)

    Analysis of common faults of engines

    Analysis of common faults of electronically controlled engines Common failures of electronic-controlled engines are as follows: difficult starting; unstable idle speed; unstable idle speed of hot vehicles; engine tempering; engine running weakness; engine intermittent failure; cylinder starvation; excessive fuel consumption; poor acceleration and other symptoms. There are various reasons for every failure. 1.6 The reasons for engine tempering are: (1) too thin mixture, slow burning rate (2) poor ignition system or ignition time too late (3) poor fuel supply system, insufficient fuel supply (4) air intake system leakage, too thin mixture (5) valve clearance is not appropriate, valve action is abnormal; (6) exhaust system is not smooth (7) ignition sequence disorder Feilong Jiangli will share other faults analysis of electronically controlled engine.
  8. 袁春凤 (Tiffany)

    Analysis of common faults of engines

    Analysis of common faults of electronically controlled engines Common failures of electronic-controlled engines are as follows: difficult starting; unstable idle speed; unstable idle speed of hot vehicles; engine tempering; engine running weakness; engine intermittent failure; cylinder starvation; excessive fuel consumption; poor acceleration and other symptoms. There are various reasons for every failure. 1.6 The reasons for engine tempering are: (1) too thin mixture, slow burning rate (2) poor ignition system or ignition time too late (3) poor fuel supply system, insufficient fuel supply (4) air intake system leakage, too thin mixture (5) valve clearance is not appropriate, valve action is abnormal; (6) exhaust system is not smooth (7) ignition sequence disorder Feilong Jiangli will share other faults analysis of electronically controlled engine.
  9. 袁春凤 (Tiffany)

    How to do daily maintenance of car engine?

    Daily maintenance of engine 1. Enhancing the maintenance of the air filter, oil filter and fuel filter to maintain a good working condition is very important to reduce the wear of the air dimple sleeve. Strengthening the maintenance of the "three filters" is an important measure to prevent mechanical impurities from entering the cylinder, reduce cylinder wear and tear, and prolong the service life of the engine. It is absolutely wrong that some drivers do not install air filters in order to save fuel in rural and sandy areas. 2. keep engine working temperature. The normal working temperature of the engine should be too low. Failure to maintain good lubrication will increase the wear and tear of the cylinder wall. The water vapor in the cylinder is easy to condense into waste acidic electrons and produce acidic substances, which will cause the cylinder wall to be corroded and worn. The test shows that when the temperature of the gas wall decreases from 9 to 50 degrees, the wear rate of the cylinder is 4 times that of 90 degrees. If the temperature is too high, the strength of the cylinder will be reduced and worn, and even the piston may be over-expanded and cause the accident of "expanding cylinder". Feilong Jiangli will share other kind of maintenance of engine.
  10. features of power-train mounting structure Rectangular hydraulic mount 1 design of automatic fault prevention device 2 in the vertical direction, the stiffness is adjustable and the stiffness is adjustable in the vertical direction. 3 lower static stiffness (front and rear direction, vertical direction) 4 the lateral stiffness is high ((a) of the left side. The lateral static stiffness is low. 5 good vibration isolation performance in vertical direction.
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