Chapter 3 Ventilation system Section 1 Valve train 2.2 Valve transmission group tappet、push rod、rocker、camshaft、timing gear et al. (1)Tappet ~3 mm -3 mm (a) (b) Figure 3.8 Tappet automatic rotational structure 业机械持电子工程度 Automobile and Tractor Northwest A&F UniversityAutomobile and Tractor Northwest A&F University Chapter 3 Ventilation system 2.2 Valve transmission group tappet 、 push rod 、 rocker 、 camshaft 、 timing gear et al. (1) Tappet Figure 3.8 Tappet automatic rotational structure Section 1 Valve train