Multi-molded-line cam shaft and engine with multi-molded-line cam shaft

The utility model discloses a multi-molded-line cam shaft and an engine with the multi-molded-line cam shaft. The multi-molded-line cam shaft comprises a shaft body. A first high-lift cam part, a second high-lift cam part, a low-speed large-lift cam part and a low-speed small-lift cam part which have the same radial structure are arranged on the shaft body; the lift of the low-speed large-lift cam part and the lift of the low-speed small-lift cam part in the working section are both lower than that of the first high-lift cam part, and the lift of the low-speed small-lift cam part in the working section is smaller than that of the low-speed large-lift cam part; and a cam switching structure is also arranged on the shaft body. According to the multi-molded-line cam shaft and the engine with the multi-molded-line cam shaft, switching of the high-lift cam and the low-lift cam can be achieved through matching of the cam switching structure and the external driving structure according to different rotating speed wo