For everyday use in terms of tires , tire pressure should pay attention to the problem . Some people think that caused the puncture is too full of cheer , that tire undervoltage big problem , which is very one-sided.
If insufficient tire pressure : Average travel speed is very fast car , the shape of the tire in a high-frequency alternating state , if the pressure will increase less deformation , on both sides of the tread excessively worn tread , carcass inability ground against pressure and distortion , high temperatures and accelerated tire wear , resulting in a puncture.
According Hengding wheel hub bearing noted , if the tire pressure is too large : if the tire pressure is too large will also lose their flexibility and excellent shock-absorbing ability , not only grip deteriorates , central tread excessive wear will produce uneven tread depth phenomenon, even under high speed tires may not withstand excessive expansion due to the pressure of a puncture occurs .
Puncture is the number one killer in road traffic accidents , according to statistics , 46 percent on the highway due to accidents caused by tire failure , which would puncture a tire accounted for 70 % of the total accidents . When cars , tire temperature rises due to friction with the ground , especially at high speeds and the emergency brake , the gas temperature will rise rapidly in the tires, tire pressure surge, so there may be a puncture . The high temperatures cause tire rubber aging , fatigue strength decreased , tread wear dramatic , but also important factors that could puncture . Compared with the general high pressure air , high-purity nitrogen substantially free of moisture and oxygen-free because no oil , low coefficient of thermal expansion , low thermal conductivity , heat slowly , reducing the speed of the tires generate heat , then no aid etc. However not characteristics, so can greatly reduce the chance of a puncture .
So the tire pressure is too high or too low has a puncture hazard , not inconsiderable pressure problems. Manufacturers should be required to maintain in accordance with standard tire pressure , including the spare tire pressure . The tire with tire pressure measurement can be measured themselves , but measured at the tire temperature necessary for the state as the result of heat in the tire state is not accurate measurement .
Are inert with nitrogen gas , dry nitrogen at the temperature change , volume expansion than air having a low moisture , high speed so that when the tire temperature , tire pressure less increase , reducing the chance of a puncture . Further, since a moisture-free nitrogen gas , and therefore to protect the rim from the internal oxidation , thereby effectively extending the life of the tire.
Nitrogen, under constant conditions is an odorless, colorless, odorless gas , and generally non-toxic, accounting for 78.12% of atmospheric nitrogen, total ( volume fraction ) , is the main ingredient of air. Is a gas at normal temperature under normal atmospheric pressure , when cooled to -195.8 ℃, no color becomes liquid when cooled to -209.86 ℃, liquid nitrogen into snow -like solid. Nitrogen does not support combustion nonflammable , chemically very stable , the reaction occurs at room temperature is difficult with other substances.
According Hengding wheel hub bearing is understood that the use of nitrogen , tire pressure stable volume change is small, greatly reducing the possibility of irregular tire friction , such as the crown grinding, shoulder milling , eccentric wear , improve the life of the tire ; rubber aging is molecular oxygen in the air caused by oxidation , and strength after aging decreased flexibility and cracking phenomena will , when one of the causes of shortening the life of the tire . Nitrogen separation device can greatly limit the exclusion of air oxygen , sulfur , oil, water and other impurities to reduce the tire inner liner rubber, the degree of corrosion and oxidation phenomena , will not corrode the metal rim , the extension of the tire life, but also greatly minimize rim rusty condition .
Nitrogen is almost inert diatomic gas , chemically very inert , oxygen than large molecules of gas molecules , not the heating or cooling , the amplitude of deformation is small , the penetration of the tire sidewall than the air velocity of about 30 to 40% slower , can be maintained tire stability , improving driving stability of the tire to ensure driving comfort ; nitrogen audio low conductivity , corresponding to a normal air / 5 , the use of nitrogen to reduce the noise of the tire can effectively improve the quietness of running .
