DOUBLE ECCENTRIC VALVE

• Main Authors: ITO SHIGETO, YOSHIOKA MAMORU, KAWAI SHINJI, INAGAKI TAKAKI, KITAMURA SUNAO
• Format: Patent
• Language: English; Japanese
• Published: 11.01.2018
• Subjects: ACTUATING-FLOATS; BLASTING; COCKS; COMBUSTION ENGINES; DEVICES FOR VENTING OR AERATING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; TAPS; THERMAL INSULATION IN GENERAL; VALVES; WEAPONS

PROBLEM TO BE SOLVED: To suppress the contact wear of a valve body and a valve seat by suppressing the vibration of the valve body even if a negative pressure fluid acts on the valve body at a valve-opening from a full-closed state, and to stabilize a fluid flow rate characteristic.SOLUTION: An EGR valve including a double eccentric valve comprises a valve seat 38, a valve body 39, a rotating shaft 40 and a flow passage. The flow passage is branched to an upstream-side flow passage 36A and a downstream-side flow passage 36B with the valve seat 38 as a boundary, and the valve body 39 is arranged at the downstream-side flow passage 36B. The valve body 39 includes a first side part 39A and a second side part 39B with a virtual face V1 extending in parallel with a direction in which an axial line L2 of the valve body 39 extends from an axial line L1 of the rotating shaft 40 as a boundary. When the valve body 39 turns to a valve-opening direction from the full-closed state, the first side part 39A turns to the upstream-side flow passage 36A, and the second side part 39B turns to the downstream-side flow passage 36B. In order to regulate the turn of the valve body 39 in the full-closed state to a valve-closing direction, a valve-closing stopper 65 is arranged at the first side part 39A so as to be lockable. A spring for turning and energizing the valve body 39 in the full-closed state to the valve-closing direction is arranged.SELECTED DRAWING: Figure 6 【課題】全閉状態からの開弁時に弁体に負圧流体が作用しても、弁体の振動を抑えることで、弁体と弁座の接触摩耗を抑え、流体流量特性の安定化を図ること。【解決手段】二重偏心弁を含むＥＧＲ弁は、弁座３８、弁体３９、回転軸４０及び流路を備える。流路は、弁座３８を境に上流側流路３６Ａと下流側流路３６Ｂに分かれ、下流側流路３６Ｂに弁体３９が配置される。弁体３９は、回転軸４０の軸線Ｌ１から弁体３９の軸線Ｌ２が伸びる方向と平行に伸びる仮想面Ｖ１を境とする第１側部３９Ａと第２側部３９Ｂを含む。弁体３９が全閉状態から開弁方向へ回動するとき、第１側部３９Ａは上流側流路３６Ａへ回動し、第２側部３９Ｂは下流側流路３６Ｂへ回動する。全閉状態の弁体３９の閉弁方向への回動を規制するために閉弁ストッパ６５が第１側部３９Ａに係合可能に設けられる。全閉状態の弁体３９を閉弁方向へ回動付勢するスプリングが設けられる。【選択図】図６