Disclosed are a linkage control device and a blood gas analyzer adopting the linkage control device. The linkage control device comprises a power unit and a rotating component (4) provided with bosses (41, 42). The power unit generates power to drive the rotating component (4) to rotate. The linkage control device further comprises valve components (5, 6, 7, 8), a signal control unit, sensing switches, and sensing pins (43, 44, 45, 46). The valve components (5, 6, 7, 8) are matched with the bosses (41, 42) of the rotating component (4) in a pushing manner. The signal control unit controls the start or stop of the power unit. The sensing switches are connected to the signal control unit via signals. The sensing pins (43, 44, 45, 46) are arranged in pair with the sensing switches and are arranged on the rotating component (4).

A compact power unit with a sufficient clearance between a stud bolt and a fixing shaft of a cam chain tensioner pivot mechanism for supporting a cam chain tensioner guide. The power unit including a crankshaft, a stud bolt configured to fix a crankcase and a cylinder body to each other, a cam chain, a cam chain tensioner mechanism including a cam chain tensioner guide, and a cam chain tensioner pivot mechanism including a pivot plate, a fixing shaft, and a swinging shaft, the fixing shaft and the swinging shaft are arranged so as to straddle the axis of the stud bolt as viewed in the axial direction of the crankshaft.