| 摘要 |
PROBLEM TO BE SOLVED: To provide a injection amount measuring device capable of measuring the injection amount of a fuel injection device quickly and accurately. SOLUTION: A flowmeter 22 measures the rate of flow of a test fluid supplied from a pump 20 to flow through a fluid supply passage 80, i.e., measures the injection amount of the fuel injection device 10. A volume member 50 having an enlarged capacity chamber 51 is installed in the neighbourhood upstream of the fuel inlet of the fuel injection device 10. The flow area of the chamber 51 is greater than the fluid influx passage 52 through which the test fluid flows from the pump side 20 into the chamber 51 and the fluid outflow passage 53 through which the test fluid flows out from the chamber 51 toward the fuel injection device 10. The influx passage 52 and outflow passage 53 do not lie on the same straight line but are formed in positions approximately perpendicular. Permeation waves and reflex waves are generated in the test fluid in the fuel injection device 10 when a needle 12 opens and closes a jet 13, and thereby the pressure pulsation generated in the fuel injection device 10 reduces while it propagates from the outflow passage 53 to the chamber 51.
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