| 摘要 |
PURPOSE:To prevent occurrence of compression of liquid and to ensure the operation of a brake booster by connecting, via a check valve, a vacuum tank for an idling-up equipment to the immediate front of the delivery port of a vacuum vane pump for a brake booster. CONSTITUTION:A vacuum tank 10 connected to a brake booster 11 is connected to the suction opening of an vane-type vacuum pump by means of a connecting pipe 14 via a check valve 6. On the other hand, a vacuum tank 12 for a vacuum control equipment like an idling-up equipment is connected to the immediate front of the delivery port 4 of a vane-type vacuum pump via a check valve 6a. With this, the oil stagnating in the vicinity of the delivery port of the pump is forcibly discharged by the air inflow from the vacuum tank 12. Therefore, the oil is prevented from being compressed. In addition, since the brake booster vacuum pump 10 and the vacuum tank 12 serving as a vacuum control equipment are independent from each other, sure operation of the brake booster 11 can be obtained.
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