Browse Publications Technical Papers 2018-32-0026
2018-10-30

Development of Joint Sheet Gasket with Reduced Amount of Aramid Fibers 2018-32-0026

Gasket made of joint sheet is widely used for mating surfaces of an engine and a transmission. Ahead of the law enforcement of banning of asbestos usage, Honda had already started to apply non-asbestos gasket using aramid fibers as the substitute material for asbestos all over the world. However, aramid fiber is very expensive while the sealing performance of a joint sheet largely depends on the added amount of aramid fibers. Therefore, when it is adopted, the resulting cost increase becomes an issue. Accordingly, we designed a material aiming at the cost reduction while maintaining the required reliabilities for a joint sheet in real applications mainly by reducing the amount of aramid fibers. According to the required characteristics for a joint sheet, the constituent materials of the middle layer were optimized by combining glass fibers with coarse-grained silica as a reinforcement substance into highly fibrillated aramid fibers as the base material. In addition, the material structure was optimized by adding a skin layer superior in shape-following and sealing against the fastened object. By combining these measures, reduction of aramid fiber amount was achieved without sacrificing required properties. Furthermore, by constructing a dynamic evaluation method considering the operating environment of the engine, it was made possible to evaluate the joint sheet specific performances with high accuracy. As a result, it enabled the development of a joint sheet using a less amount of aramid fibers, realizing low cost together with superior sealing performance with the long lasting durability.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Attention: This item is not yet published. Pre-Order to be notified, via email, when it becomes available.
Members save up to 43% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.
X