轿车轮胎型号变更的设计管理(国外英文资料).docVIP

轿车轮胎型号变更的设计管理(国外英文资料) 1 re determination of tire specifications As a result of the design vehicles complete vehicle parameter and the chassis posture is according to the standard vehicle tire specification to determine. In order to ensure the vehicle parameters and chassis posture unchanged, in the re selection of tires, you must ensure that the tire radius of the new tire is basically the same as the benchmark tire. The contact area can be reduced by reducing the nominal section width of the tire, thereby reducing rolling resistance and reducing cost. According to the relevant parameters of national standard GB/T2978-1997; Tyre specification 215/65R16235/60R16 Load index standard 98100 Enhancement - Basic parameters standard rims 6.5J7J Allow use of rims 6J, 7J6.5J, 7.5J Main size, new tyre Inflation Rear section width 221mm240 mm The outer diameter is 686 mm688 mm The static radius is 312 mm313 mm under load Scroll radius 333 mm334 mm Most Ambassador Use dimension section width 230 mm250 mm The outer diameter is 698 mm699 mm Load capacity Kg standard 750800 Enhancement - Inflation pressure Kpa standard 250kPa The static radius of 235/60R16 is 313mm, the rolling radius is 334mm, the outer diameter is 688mm, and the section width is 240mm. Through look-up table, it is found that 215/65R16 meets the requirements: static radius is 312mm, rolling radius is 333, mm, outer diameter is 686mm, section width is 221mm. The tire radius is basically the same, and the width of the section is reduced, which meets the initial requirements of the specifications. 2 load index and determination of air pressure The load capacity of a tire is related to the amount of inflation in the tire. Standard tires are also specified in terms of size and air pressure. According to the national standard GB/T2978, the standard load index of 235/60R16 is 100, the standard charging pressure is 250kPa, the standard load index of 215/65R16 is 98, and the standard charging pressure is 250kpa. As the c