1、 附录 Bus chassis Summary Bus chassis is the most important part, it has a direct bearing on the performance of bus. Chinas bus industry started late, so far only 20 or so, on our bus chassis development, can be summarized as: late start, poor foundation, rapid development, and gradually narrow the ga
2、p between foreign and other features. Before the 1980s, Chinas main passenger vehicle chassis modifications. Since slower vehicle speed, vehicle ride is not too high, thus converted into a low-speed bus (maximum 75 kilometers), comfort poor. In 1981 the original factory in Yangzhou Bus (now Yangzhou
3、 Yaxing Bus Co., Ltd.) the successful development of the first bus chassis JT663, and its truck chassis compared to the past, Speed (90 km / h), using a wide front axle for Lunju bus, cycle-ball steering gear and dual-circuit brake system pressure, when the system is also a breakthrough has been abl
4、e to find a people-oriented Design concept. JT663 Preparation of success, marking the birth of Chinas bus chassis, is of epoch-making significance. In the 1990s, the development of Chinas highway speed of vehicles by the new requirements, the requirements of the largest vehicles more than 120 kilome
5、ters per hour, normal driving speed of 90 km above. Although at this time many of the domestic passenger business through joint ventures, cooperation or technology transfer and other means to start producing high-speed bus, but due to high cost of these vehicles only on the strength of passenger tra
6、ffic, operating in economically developed areas, the economy in underdeveloped regions The number of road mixed lines, the lack of suitable vehicles. At this point buses and chassis business JT66 3 chassis design from the successful experiences of, To reduce the body to relieve themselves, reduce th
7、e maximum gross vehicle quality, increased engine power, improve power vehicles than measures such as using integrated power steering and noise, cooling fast, long service life of the radial tire, designed to produce Regular rate is greater than 90 km and a maximum speed reached 10 km above the JS68
8、20 and bus chassis. Because the main assembly of the car were domestic cases, the price of only 30 million, higher cost performance, the general passenger business in about six months to recover the cost, so welcomed by domestic users. 9th Five-Year period, the industrial development of Chinas passe
9、nger by the State attaches great importance to the State Economic and Trade Commission will require high standards of the two passenger buses JT6890 Development as a 9th Five-Year technology projects. At the same time with the development and bus chassis production capacity of enterprises, for domes
10、tic auto parts production lag, and some trains were unable to meet the needs of the actual situation of international procurement, give priority to the forthcoming joint venture in China of products, as well as the domestic auto parts Production enterprises to participate in international economic c
11、ooperation matchmaking. Due to international against the procurement methods, and new development of chassis JT6890 control of the lower cost, the price of imports than the same type of chassis low 45 percent. The end of 1998, JT6890 after 30,000 km of the road test, a comprehensive national identif
12、ication. Although JT6890 chassis assembly were chosen by the United States, Germany, Sweden, Britain and other six countries over 20 kinds of assembly, but a perfect match, it is commendable. Although China-made bus chassis in recent years developed very quickly, but compared with other countries, w
13、hether from the design level or from the assembly of the reliability, the gap is still great, particularly the assembly of the quality and reliability of the more prominent issues . With Chinas accession to the WTO is approaching, international cooperation will be further expanded, this will benefit
14、 Chinas passenger bus chassis design and assembly of raising the level of production, as soon as possible with the advanced world level to narrow differences in opportunities. Since the chassis is the largest body parts, body is good or bad is bound to lead the chassis completely good or bad, a good
15、 body is to have high rigidity, the so-called high-rigidity is not deformed. Traffic on the road, with the naked eye looks like no deformation, but in fact will be the impact of the road because of constant deformation, but a body deformation, vehicles will not be obedient, do not think that the 1 2
16、 mm no deformation, it will You it difficult to control in high-speed vehicles, because in high-speed, you do not control the vehicle to 10 mm, which is why the automotive media often say that the body rigid for high-speed stability on the absolute nature of the impact. But here referred to the rigi
17、d body has nothing to do with security, if really want to make, of course, can make a very good control with no security of the body, and vice versa. Therefore, the manipulation of rigid body is not seen by the impact test, usually rigid body with the manipulation of the distorted rigid test of a fi
18、xed endpoint of a body, then the diagonal line endpoint SHI Li, the deformation obtained vehicles Point of view, in units of Nm / deg, this is the depot in the vehicle, often said to the rigid body and raise the number percent of the units of measurement, It is a pity that the world depot for the nu
19、mber of confidentiality home, making relatively rigid body can only be subjective impression of the test, but no scientific data, coupled with the suspension and shock absorbers of the fuzzy, into the old rigid body Wang Maigua traders puff, lies in constantly attacking Jie of the Rashomon. However,
20、 regardless of rigid body again, if the suspension arm directly to the car body, also because of stress concentration, and have too many local deformation, so the best equipment on the rigid frame of a higher, will be suspended from The strength of the crane through the frame, distributed to more ca
21、rs on the body to reduce the deformation, so that the high-priced cars will not mean trailers loaded deputy, to reduce the pressure faced by the body. Chassis suspension system has always been the most volatile areas, because in addition to consider the rigid, point of control is a major challenge,
22、said the first briefing when the steering control, and some cars can be done near real-time responses to some After turning the steering wheel cars only about one second reaction (AOL really tried this car), there is such a major difference between the issue or rigid, less than the rigid body and su
23、spension will absorb deformation out to you the action, and then Rebound out, the car will be open to such people do not have a sense of stability, is actually not trust, Another will be because of early action to be eaten, the driver of the steering wheel will turn some more, leading to the latter part of the centrifugal force caused too much out of control, this car for a long time driving skills will be wrong, leading to vulnerable low-speed out of control. Of course, in addition to the most basic of steering control, suspension system
