FUEL PUMP

To provide a fuel pump capable of suppressing fatigue fracture of a fixing portion for supporting a cylinder.SOLUTION: A high-pressure fuel supply pump 100 includes: a plunger 2 performing reciprocating motion; a cylinder 6 in which a guide hole 6a for guiding the reciprocating motion of the plunger...

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Bibliographic Details
Main Authors HASHIDA MINORU, USUI SATOSHI
Format Patent
LanguageEnglish
Japanese
Published 22.05.2023
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Summary:To provide a fuel pump capable of suppressing fatigue fracture of a fixing portion for supporting a cylinder.SOLUTION: A high-pressure fuel supply pump 100 includes: a plunger 2 performing reciprocating motion; a cylinder 6 in which a guide hole 6a for guiding the reciprocating motion of the plunger 2, extends in an axial direction; and a pump body 1 having a third chamber 1c (cylinder insertion hole) to which the cylinder 6 is pressure-fitted, and a pressurization chamber 11 whose volume is increased and decreased by the reciprocating motion of the plunger 2, the pressurization chamber 11 being connected to the third chamber 1c. The pump body 1 has a fixing portion 1x projecting from an opening portion of the third chamber 1c and supporting the cylinder 6. A surface kept into contact with the fixing portion 1x of the pump body 1, of the cylinder 6 is formed into a smooth continuous surface.SELECTED DRAWING: Figure 7 【課題】シリンダを支持する固定部の疲労破壊を抑制することができる燃料ポンプを供給する。【解決手段】本発明の高圧燃料供給ポンプ100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が軸方向に延びるシリンダ6と、シリンダ6が圧入される第3室1c(シリンダ挿入孔)と、第3室1cに連通し、プランジャ2の往復運動により容積が増減する加圧室11とを有するポンプボディ1とを備える。ポンプボディ1は、第3室1cの開口部から突出してシリンダ6を支持する固定部1xを有する。そして、シリンダ6におけるポンプボディ1の固定部1xに接触する面は、滑らかに連続する面に形成されている。【選択図】図7
Bibliography:Application Number: JP20210183646