| 摘要 |
The rotary type oil pump, as used in an engine of an automotor, includes an internal rotor(20) and an external rotor(30) which are installed eccentric to each other on a body(10) thereof. The internal rotor(20) is provided with a plunger(24) which is elastically supported by a spring(25) and is operated by means of the centrifugal force of the internal rotor(20), whereby the operation of the plunger(24) forms a bypass path(23), without any additional bypass valve. The internal rotor(20) forms an operation groove(22) in a radius direction on a tooth(21) thereof, and forms the bypass path(23) crossing to the operation groove(22) and connected to the both sides of the tooth(21). The plunger(24), which is supported by menas of the spring(25) and is covered with a cap(26), is inserted into the operation groove(22).
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