FUEL PUMP

• Main Authors: SAITO JUNJI, HASHIDA MINORU, USUI SATOSHI, KONO TATSUO
• Format: Patent
• Language: English; Japanese
• Published: 13.12.2021
• Subjects: BLASTING; COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; WEAPONS

To provide a fuel pump capable of maintaining discharge performance even when fuel pressure is increased.SOLUTION: A fuel pump of this invention includes a reciprocating plunger 2, a cylindrical cylinder 6 having a guide hole 6a extending in an axial direction so as to guide the reciprocating movement of the plunger 2, and a pump body 1 for holding the cylinder 6. The cylinder 6 has a contact surface 61a which is pressed by the pump body at one end in the axial direction. The contact surface 61a is annularly formed around an axis of the cylinder 6, and an outside diameter D4 of the contact surface 61a is smaller than an outside diameter D3 of the cylinder 6.SELECTED DRAWING: Figure 5 【課題】燃料圧力を高めても吐出性能を維持することができる燃料ポンプを提供する。【解決手段】本発明の燃料ポンプは、往復運動するプランジャ２と、プランジャ２の往復運動をガイドするガイド孔６ａが軸方向に延びる円筒状のシリンダ６と、シリンダ６を保持するポンプボディ１とを備える。シリンダ６は、軸方向の一端部にポンプボディに押圧される接触面６１ａを有する。接触面６１ａは、シリンダ６の軸を中心とする円環状に形成され、接触面６１ａの外径Ｄ４は、シリンダ６の外径Ｄ３よりも小さい。【選択図】図５