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We studied the propriety of finite element method (FEM) analysis by using the Mooney-Rivlin quadratic model. A Mooney-Rivlin number can be analyzed by software attached to FEM software. But the degree of agreement with an experimental value is poor. And software is in a black box. Therefore, we had to originally develop an analysis software anew. The measurement data are tensile test data of one axis. As for the Mooney-Rivlin quadratic model, calculation is complicated, but the precision and the power of expression are good enough. About the deformation force of a product, the calculated value agrees well with measured value.

We developed the method to reduce the sliding friction of power steering rod seals by changing a lip configuration without lowering any interference and radial load. The data of various items and friction on several kinds of samples were analyzed in order to obtain how to reduce sliding friction. The sliding friction can be possibly analyzed in using the lubrication theory. The contact width and oil film thickness are important factors.