| 摘要 |
<P>PROBLEM TO BE SOLVED: To stabilize delivery flow rate at a time of load generation without excessively reducing delivery flow rate at a time of low temperature load generation in a variable displacement pump. <P>SOLUTION: In the variable displacement pump 10 in which a change over valve device 60 has a valve element 64A opening and closing to a communication path 61 connecting a pressurizing chamber 66A communicating with the upstream side of a main restrictor 58 and connected to the first fluid pressure chamber 41, the valve element 64A of the change over valve device 60 is provided with a first land part 101 opening and closing the pressurizing chamber 66A to the communication path 61, and a second land part 102 communicating with a pump suction side path, and an annular groove 103 provided over all circumference between the first land part 101 and the second land part 102. <P>COPYRIGHT: (C)2007,JPO&INPIT |
