Sealing structure and design method in engine mode selecting mechanism

The invention discloses a sealing structure and a design method in an engine mode selecting mechanism belonging to the technical field of engines. The sealing structure comprises a sealing frame, a linkage block, a pushing block and a regulating valve, wherein a front case is fixedly arranged on the left side of the top part of the sealing frame; a valve port is fixedly and integrally formed in the bottom part of the sealing frame; the linkage block is inserted into the middles of the front case and the sealing frame; a driving rod is fixedly connected to the left side of the linkage block; apushing block is fixedly connected to the right side wall of the linkage block; a connecting hole is formed in the right side of the pushing block; an adjusting valve is fixedly arranged on the rightside wall of the sealing frame and comprises a connecting piece, a first connecting ring, a second connecting ring and a sealing plate; the sealing plate is integrally formed on the bottom part of theconnecting piece; and the