| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure regulator suitable for accurate control of a fine fuel amount from a fuel injection valve. SOLUTION: A fuel chamber 7 comprises a housing body 1; and one side 4A of a small diaphragm 4, and a fuel inflow passage 8 and a fuel return passage 9 are opened in a fuel chamber 7. A negative pressure chamber 12 consists of a cover housing 3 and the other side 5B of a large diaphragm 5, and a negative pressure introduction passage 13 is opened in the negative chamber 12. An atmosphere chamber 10 is located between the fuel chamber 7 and the negative pressure chamber 12 and consists of one side 5A of the large diaphragm 5, the other side 4B of a small diaphragm 4, and an intermediate housing 2. The large diaphragm 5 and the small diaphragm 4 are integrally intercoupled through a coupling lever 6. A valve part 14 to open and close a fuel return passage 9 is arranged on the one side 4A side of the small diaphragm 4. A spring 15 contracted in the negative pressure chamber 12 energizes the large diaphragm 5 to the fuel chamber 7 side. |
