| 摘要 |
PROBLEM TO BE SOLVED: To restrain abrasion of a seal material by preventing the shakes of a cap in a simple structure. SOLUTION: This resonator device for a high-pressure fuel pump is mounted among a casing 18 forming a fuel passage 22, a cover 29 mounted on the casing 18, the casing 18 and the cover 29, and forms a fuel passage chamber 32 between it and the fuel passage 22 of the casing 18. A volume chamber 33 is formed between it and the cover 29, a cap 23 for communicating the volume chamber 33 with the fuel passage chamber 32 through an orifice 23b is provided, and the outside diameter ϕB on the fuel passage chamber 32 side in the cap 23 is set to the outside diameter smaller than the outside diameter ϕA on the volume chamber 33 side. |
