HIGH-PRESSURE PUMP STRUCTURE OF INTERNAL COMBUSTION ENGINE

• Main Authors: OMIYA SATOSHI, NAMBA MASAHARU
• Format: Patent
• Language: English; Japanese
• Published: 22.10.2015
• Subjects: BLASTING; COMBUSTION ENGINES; CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES; ENGINE PLANTS IN GENERAL; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; STEAM ENGINES; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; WEAPONS

PROBLEM TO BE SOLVED: To provide a high-pressure fuel pump structure of an internal combustion engine which can secure a fuel discharge amount without enlarging a size.SOLUTION: A high-pressure fuel pump 1 boosts pressure by using a plunger 3 which reciprocates in a plunger chamber 2 in conjunction with the rotation of a drive cam 10 arranged at a cam shaft 9, and pressure-sends the boosted pressure to fuel injection means. The drive cam 10 is selectively held to a first crest cam 11 which is fastened to the cam shaft 9, a second crest cam 21 which is relatively and rotatably arranged at the first crest cam 11 so as to be coaxial therewith, a reference position in which mutual cam crests 15a, 25a continue to an axial direction with the second crest cam 21 set to face the first crest cam 11, and a movable position in which the cam crest 25a of the second crest cam 21 is located between the adjacent cam crests 15a of the first cam 11. 【課題】大形化を伴うことなく燃料吐出量が確保できる内燃機関の高圧燃料ポンプ構造を提供する。【解決手段】カムシャフト９に配置された駆動用カム１０の回転に連動してプランジャ室２内を往復駆動するプランジャ３によって昇圧して燃料噴射手段に圧送する高圧燃料ポンプ１であって、駆動用カム１０を、カムシャフト９に固着された第１山カム１１と、第１山カム１１と同軸上で相対回転可能に配置された第２山カム２１と、第２山カム２１を第１山カム１１に対して互いのカム山１５ａ、２５ａが軸方向に連続する基準位置と、第１カム１１の隣接するカム山１５ａ間に第２山カム２１のカム山２５ａが位置する可動位置とに選択的に保持する。【選択図】図２