VALVE DRIVE DEVICE WITH DIFFERENTIAL GEAR

摘要

PROBLEM TO BE SOLVED: To provide a valve drive device in which the handle shaft is in line with the output shaft (valve drive shaft), the shafts rotate in the same direction, and which is assembled easily due to the reduced number of part items of the device including inner gear and outer gear. SOLUTION: An eccentric disk cam is provided on the handle shaft on which the handle is installed. The differential gear rotatably installed to the disk cam has an inner gear on internal surface of bow shape revolving round the handle shaft and is engaged with the fixed outer gear which has a smaller number of teeth. The rotation of differential gear associated with its revolution caused by the rotation of the handle shaft is transferred to the output shaft through Oldham's Coupling provided between the differential gear and the output shaft.