| 摘要 |
PROBLEM TO BE SOLVED: To provide a gear pump for easily adjusting a delivery flow rate with a simple constitution. SOLUTION: This gear pump has a first pump 20 having a first driving gear 21 rotating by driving of a driving shaft 11 and a first driven gear 22 coaxially rotatably arranged with a rotary shaft 12, and a second pump 30 having a second driving gear 31 coaxially rotatably arranged with the rotary shaft 12 and a second driven gear 32 coaxially rotatably arranged with the driving shaft 11. The rotary shaft 12 can engage-disengage the first driven gear 22 and the second driving gear 31 in the rotational direction by moving in the axial direction in response to delivery pressure of the first pump 20. When the delivery pressure of the first pump 20 is high, rotation of the first driven gear 22 is not transmitted to the second driving gear 31, and only the first pump 20 is operated, and when the delivery pressure of the first pump 20 becomes a predetermined value or less, the rotation of the first driven gear 22 is transmitted to the second driving gear 31, and both the first and second pumps 20 and 30 are operated. COPYRIGHT: (C)2011,JPO&INPIT
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