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Based on the theoretical calculation of the stiffness, stress and fatigue life of the spring vent, the spring fatigue life of three kinds of materials is simulated by the finite element method, and it is concluded that the service life of 65Mn materials is 59% and 41% higher than that of ordinary carbon steel (70) and Si bronze (QSi3-1) respectively. Spring vent’s main component is the spring, whose good or bad performance directly affect its exhaust performance and service life, Spring vent structure is shown in Figure 1. Spring material: Ordinary carbon spring wire, Grade 70; spring steel, grade 65Mn;silicon bronze, brand QSi3-1. The spring structure parameters are shown in Table 1. Figure 1 Structure diagram of Spring vent. Table 1 Spring structural parameter. Program Numerical value Spring middle diameter(D) 1.6 mm Material diameter (d) 0.2 mm Spring stroke(δ) 0.5 mm Precompressed spring length (λ) 2 mm Max Free Testable Length (L) 8.5 mm Design cycle times 10000 1. Theoretical analysis 1.1. The Theory of Stiffness The stiffness calculation formula of spring :

Analysis on the Spring’s Fatigue Life of Spring Vent