1. Overview
timing chain
In recent years, however, an automobile engine timing drive more and more widely employed chain drive system, because of its compact structure , delivery of high power, reliability and high wear resistance, type and diverse design, maintenance-free life and other significant advantages, overcomes some of the deficiencies on the gear drive and belt drive performance, and end-users to the car adds a new value, increasingly shows its broad market prospect.
“timing belt” or “timing chain” is an important engine parts. The main role of the timing belts ‘or’ timing chain “is used to drive the valve mechanism of the engine, the intake and exhaust valve of the engine is opened or closed at the appropriate time, to ensure that the suction cylinder of the engine can be properly and exhaust. when Chiang Kai-shek and some models also responsible for driving the water pump belt, such as EFI Jetta Volkswagen models among Bora, Sagitar, Audi and other models.
2, using the principle of
[123 ] timing chain the timing chain is working against high-strength metal chain, connecting the crankshaft and camshaft sprockets like member and synchronize the operation, because a high speed between the metal wear high temperature fast, it is necessary to design appropriate lubrication system cools and lubricates the same time using a timing chain engine design there is friction between the metal noise problems, to solve this problem manufacturers need to take various measures, for example, a chain like design optimization in order to solve these problems is bound to increase the design and manufacturing cost of the engine.
3, the difference
Although the timing belt “and” fundamental role of the timing chain, “the same, but it works still have some differences.
inside the timing belt rubber has many teeth on the timing belt teeth and the use of these rubbers withShall rotary member (camshaft, pumps, etc.) with a recess on top of the engine crankshaft to pull another operation member, and the holding member driven synchronous operation. Timing belt can be seen as a soft image of the gear. At the same time also be required to work the timing belt tensioner (automatic or manual adjust its tightness) and the idler (guiding the belt running direction) or the like with the working attachment.
compared with the timing chain timing belt has a relatively simple structure, no lubrication, quiet operation, easy installation and maintenance, and low manufacturing costs. However, the timing belt belonging rubber (hydrogenated nitrile rubber) member, with the increase of engine operating time, timing belt wear and aging will occur. If not replaced, once the timing belt tooth skipping or breaking operation of the engine operating member will cause damage disorder member. The engine intake and exhaust valves of the engine piston motion and collision damage caused by uncoordinated.
timing chain manufacturing is a highly professional product. To reduce costs, this technique would pin chromizing invention, its hardness up 1300-1600HV, the pin greatly improved wear resistance and corrosion resistance. The pin can be used to make high-speed rotation of the chain, it can also be used to produce high wear resistance and needle roller bearings.
transformation of scientific and technological achievements of the project is to promote the economic development of enterprises of power products, through the application of enhancement and consolidation in the market competitiveness of enterprises, formed a business survival and sustained development of its pillar industries. Motorcycle engine is a high-speed rotation of the chain, the production process, high technical content. Currently, timing chain production accounts for the proportion of total output value of the company 62 percentage proportion of total production chain production was 42.7 percentage
China is the largest producer of motorcycles in the world, with an annual output of 20 million units, to 5 percentage each year – 10 percentage increments. Therefore, seize this opportunity to accelerate research and development of new technologies, in order to meet the needs of domestic and foreign manufacturers supporting the persistent efforts to provide high-quality high-tech products.
5, trouble and money with four timing chain runaround
BYD F0
timing chain BYD F0, thanks to this engine timing chain in the future use will save part of the maintenance costs. However, according to some owners of reaction, BYD F0 in motion, especially in reversing the process noise generated by the engine of the chain it is quite obvious, and this is a common problem many uses timing chain models.
through our real tests found BYD F0 dynamic performance remarkable, but the noise did slightly larger when the vehicle speed reaches 60km / h car noise has reached more than 70 decibels, and can significantly determine the noise from the main engine, which is a bit annoying, but overall, the use of engine timing chain more good than harm.
If you can stand the noise nuisance and in the end all the way to throttle the speed can be raised to 100km / h, then you will be able to find BYD F0 dynamic performance in the mini-car has been considered superior. Measured by that, this car look cute car’s 0-100km / h acceleration takes only 13 seconds, we’ve tested a lot of large displacement than its mini cars can not go beyond this result.
On the whole, BYD F0 is a very suitable for young consumer models, its stylish lovely shape and fully meet their favorite maverick personality, but the use of aluminum engine timing chain may be their when buying a car easy to overlook the highlights, but the benefits it brings is real.
Changhe Suzuki – Big Dipper 1.4L
can be regarded as the Big Dipper evergreens on the domestic automobile market, but this has always been the old models are also in continuous improvement in all aspects, in order to enhance their ability to survive in an increasingly tough competition, and the most obvious changes reflected in the engine, the current Big Dipper has been used before with 1.4L and 1.2L engine fully replace the 1.0L engine. And this 1.4L engine technology also has a largeAdvantage.
and Changhe Suzuki Big Dipper declared that timing chain is equipped with silent chain, but the actual driving experience and it did not feel how quiet, up to 80km / h the engine is quite restless, but with noise coming together is a good dynamic performance, as long as it opened it I am afraid no one will not admit it.
Big Dipper this 1.4L engine maximum power of 91 horsepower, an improvement of roughly 30 percentage ratio K12 engine previously used, hard to come by in this performance mini-car, plus less than a ton of weight , good acceleration performance of the Big Dipper was a little unexpected. According to our actually measured, 1.4L my hand models 0-100km / h acceleration time of just 11.79 seconds, ranked first in our measured through micro-car. After
Guangzhou Toyota Yaris
Yaris There are two power units available, but two engines are used to drive the timing chain overhead camshafts, as far as we consult 4S shop sales staff that, being on the engine Yaris chain useful life of more than 200,000 kilometers, but in the meantime require regular inspection and tuning, we believe that this argument is quite real and credible. But in any case replace the timing belt maintenance costs are certainly save a.
the low end of the Yaris is equipped with a 1.3L engine, which belongs to the Toyota NZ series was first applied in 1997, but this type of domestic Yaris is equipped with 2NZ-FE, with VVT- i variable valve timing system and using aluminum material to build, but overall this engine andNot very advanced, as the entry-level power equipment more appropriate.
If it comes Yaris 1.6L engine is mounted is relatively interesting. Listed at the beginning because the Toyota engine plant in Tianjin, limited production capacity, temporarily attend to the Yaris, so before October 2008 production of 1.6 models are equipped with imported engines, model 4ZR-FE. With the Tianjin engine plant production capacity, after production of the Yaris is equipped with 1.6 and Carola same 1ZR-FE engine. Before the original can be seen from the engine block structure is more advanced models, but both the technical point of view does not differ too much, all aluminum material and equipment DVVT-i dual variable valve timing technology, which are based on the timing chain.
Although the use of a timing chain, but that just two models and different, Yaris in very good suppression of noise on performance, which has been the Toyota models proud advantage. According to our measurement, automatic Yaris 1.6 at 80km / h or less when the car is very quiet, it is a 4-speed automatic transmission, when the vehicle reaches 120km / h due to the high speed at which the noise is a bit obvious.
and Yaris dynamic performance is also good, 1.6 displacement can burst out 118 horsepower, 4-speed automatic transmission but once again a drag, accelerating the shift test twice in the 0-100km / h actions are delayed some time, resulting in a final score of 12.91 seconds just very plain. But if cars into my hand I believe there is hope broke 12 seconds.
Yaris is Toyota that is high expectations of global strategic model, but now less than satisfactory performance in the country, which is probably its more rough interior work has a direct relationship, but the Yaris itself advantage is obvious, in addition to stylish and lovely, the 1.6 model engine technology applied can be regarded as very advanced in the current small cars, not only better dynamic performance, quiet and low maintenance costs are also highlights.
Shanghai Volkswagen Škoda Fabia
Shanghai Volkswagen POLO and Škoda Fabia has the same essence, the same engine is also equipped with both models sharing of resources practice group. In China these two cars equipped with two engines belong to the public EA111 series, however, and the foreign version, compared to the domestic engine technically lagging behind a lot.
domestic version with two engines and abroad, the abolition of stratified combustion and direct injection technology, but also by a cylinder made of aluminum alloy into a cast iron, these changes are out of the original domestic oil concerns, but now other manufacturers have launched their own direct-injection engine, hoping the public can improve their small-displacement naturally aspirated engine technology content as soon as possible, but the timing chain applications for the owners really bring benefit.
In order to verify the performance of the same engine timing chain public, we measured the crystal sharp 1.4 automatic models. In terms of crystal sharp noise test were rated very high, especially less than 50 db noise at idle, such a performance even better than in quiet known Yaris also excellent.
It is worth mentioning that, whether or POLO crystal sharp, their automatic models equipped with the 6-speed automatic transmission are relatively rare model with the level of high-end configuration, the direct benefits it brings that same speed lower speed of the engine, so that noise is suppressed naturally good, but fuel economy will be guaranteed.
but frankly the real power output of the masses of these two engines is difficult satisfactory, can be rude to say a little too weak and the same level compared to rivals. We had found 1.4 automatic crystal sharp, which 0-100km / h acceleration required 14 seconds, the test we can clearly feel the shift operation of the neat 6-speed automatic transmission, and does not become cumbersome, but the engine itself insufficient power frustration such strength is not much competition.
is not strong momentum is an indisputable fact, but POLO crystal sharp and also has its own advantages. In addition to these two models with external engine timing chain also applied the laser welding technology, and interior work is quite detailed, automatic transmission is also very dominant, if not particularly concerned about the performance of power, then, these two cars are attention-quality models target of choice for consumers.
With the continuous development of technology, many new models on the market are equipped with an engine timing chain equipment, and perhaps another 10 years we will be very difficult to find using a timing belt car, but now look at the difference in this respect is still there. Members consumers in the choice of car, in addition to care about the shape of the design, workmanship or the size of the interior space, it should pay more attention to details in these aspects like timing system, so as to avoid a lot of trouble in future vehicles.