Oil pump for vehicle

An oil pump for a vehicle having a housing adapted to form an outer wall of the oil pump, an outer ring adapted to control a pumping volume of the oil pump, and a regulator chamber formed between the housing and the outer ring so as to control a hydraulic pressure of the oil pump, the oil pump comprising:

• a sealing chamber formed between the outer ring and the housing;
• a sealing apparatus disposed in the sealing chamber for preventing leakage of oil from the regulator chamber, the sealing apparatus comprising:
• a contact portion disposed on the housing in the sealing chamber,
• a first sealing member having one end contacting the contact portion,
• a second sealing member having one end contacting the first sealing member and the other end contacting the outer ring;
• and
• an oil passage formed in the outer ring to facilitate a fluid communication of the sealing chamber with the regulator chamber;
• wherein the first sealing member closely contacts the contact portion if the second sealing member is pushed by the hydraulic pressure of the regulator chamber supplied thereto through the oil passage;
• wherein a first slanted surface contacting the second sealing member is formed at the first sealing member, and a second slanted surface corresponding to the first slanted surface and contacting the first slanted surface is formed at the second sealing member;
• and
• wherein the first slanted surface and the second slanted surface are configured such that the first sealing member is pushed toward the contact portion when the second sealing member is pushed by the hydraulic pressure.