OIL LEAK PREVENTIVE STRUCTURE OF VACUUM PUMP

摘要

PROBLEM TO BE SOLVED: To enhance the oil intrusion preventive effect by an oil intrusion preventing member used to prevent the oil from leaking into the pump chamber of a vacuum pump. SOLUTION: A shaft sealing ring 49 is fitted fast on a rotary shaft 19 in a fitting hole 47 formed in a rear housing 14, and an oil intrusion preventing ring 66 is fastened to the shaft sealing ring 49. Oil recovery chambers 70 and 71 are formed around the oil intrusion preventing ring 66. The oil recovery peripheral wall surfaces 702 and 712 is a tapered form as the wall surfaces of the oil recovery chambers 70 and 71 are arranged approaching the axis 191 of the rotary shaft 19 as going apart from the pump chamber 43 toward a gear storage chamber 331.