1. In the free state, the inner diameter of the oil seal lip is smaller than the shaft diameter and has a certain amount of interference.
2. After installation, the interference pressure of the oil seal edge and the contraction force of the self-tightening spring generate a certain radial pressure on the rotating shaft.
3. When working, the seal lip forms a 0.25 to 0.5 mm wide seal contact ring under radial pressure. Under the effect of lubricating oil pressure, oil penetrates between the edge of the oil seal and the shaft to form a very thin layer of oil film. The oil film is affected by the surface tension of the oil. A “crescent†surface is formed along the outer edge of the shaft and the edge of the oil seal to prevent the oil from overflowing and play a sealing role.
The front end of the car is fitted with bumper, which not only has decorative function, but also is a safety device that absorbs and moderates the external impact force to protect the body and the occupant.
At present, in addition to maintaining the original protection function of the car front and rear bumper, but also the pursuit of harmony and unity with the body shape, the pursuit of its own lightweight car front and rear bumper are made of plastic, people called plastic bumper.
The plastic bumper is made of plastics, mainly polyester and polypropylene, which are made by injection molding. For example, the bumper of Peugeot 405 car is made of polyester and made by reaction injection molding. Volkswagen audi 100 Golf Shanghai Santana Tianjin xiali model car bumpers, adopted polypropylene materials made from injection molding in Abroad have a called polyethylene carbon ester plastic, seeping into alloy composition, using the method of metal injection molding processing of bumper not only has high strength, rigid, also has the advantages of can welding and coating performance is good, in the amount of cars more and more.
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