HIGH PRESSURE PUMP AND METHOD FOR MANUFACTURING THE SAME

• Main Author: NAKAOKA SEIJI
• Format: Patent
• Language: English; Japanese
• Published: 25.07.2016
• 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

PROBLEM TO BE SOLVED: To provide a high pressure pump capable of preventing falling of a plunger irrespective of an attachment direction of the plunger to a cylinder.SOLUTION: A pump body 11 of a high pressure pump has a pressurizing chamber 15 formed in a deep portion of a cylinder 10, and closes a side opposite from a plunger 40 of the pressurizing chamber 15. The plunger 40 reciprocatingly arranged inside the cylinder 10 varies the volume of the pressurizing chamber 15. A large diameter portion 41 provided on an end of the plunger 40 which is protruded to the pressurizing chamber 15 has an outside diameter larger than an inside diameter of the cylinder 10 and smaller than an inside diameter of the pressurizing chamber 15. Accordingly, the large diameter portion 41 is fitted to a step portion 36 between the cylinder 10 and the pressurizing chamber 15 before the high pressure pump is attached to an internal combustion engine, and falling of the plunger 40 from the cylinder 10 can be prevented.SELECTED DRAWING: Figure 1 【課題】 プランジャのシリンダへの組み付け方向に関わらずプランジャの脱落を防ぐことの可能な高圧ポンプを提供する。【解決手段】高圧ポンプのポンプボディ１１は、シリンダ１０の深部に形成される加圧室１５を有し、加圧室１５のプランジャ４０とは反対側を塞ぐ。シリンダ１０の内側に往復移動可能に設けられるプランジャ４０は、加圧室１５の容積を可変する。加圧室１５に突出するプランジャ４０の端部に設けられる大径部４１は、シリンダ１０の内径よりも大きく加圧室１５の内径よりも小さい外径を有する。これにより、内燃機関に高圧ポンプを取り付ける前の状態で、シリンダ１０と加圧室１５との段差部分３６に大径部４１が係止され、プランジャ４０はシリンダ１０からの脱落が防がれる。【選択図】図１