VARIABLE VALVE GEAR FOR INTERNAL COMBUSTION ENGINE

• Main Author: INADA HIROKI
• Format: Patent
• Language: English; Japanese
• Published: 17.11.2016
• Subjects: BLASTING; CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES; ENGINE PLANTS IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; STEAM ENGINES; WEAPONS

PROBLEM TO BE SOLVED: To provide a variable valve gear for an internal combustion engine that enables reduction in pump loss of the internal combustion engine and friction loss when a valve is operated.SOLUTION: A variable valve gear for an internal combustion engine includes: a rocker arm 5 pivotally supported by a support shaft 3 swingably and opening/closing an intake valve 4 along with the swinging operation; a swing arm 6 that has an intermediate portion pivotally supported by the rocker arm 5 swingably by using a fulcrum arm pin 8 and includes a first input roller 15 and a second input roller 13 at positions sandwiching the fulcrum arm pin 8; a cam 2 fixed to a cam shaft 1 and coming into contact with the first input roller 15 to lift the intake valve 4; and a hydraulic actuator 20 that has a tappet 23 coming into contact with the second input roller 13 and a hydraulic chamber 29 having a volume changed by working fluid and causing the tappet 23 to operate to appear/disappear in accordance with the change and that retracts the tappet 23 by contracting the volume of the hydraulic chamber 29 to close the intake valve 4 at any timing while the intake valve 4 is lifted by a cam crest of the cam 2.SELECTED DRAWING: Figure 7 【課題】内燃機関のポンプ損失を低減するとともにバルブ駆動時のフリクション損失を低減する内燃機関の可変動弁装置を提供すること。【解決手段】支持軸３に揺動自在に軸支され、揺動動作に伴って吸気バルブ４を開閉動作させるロッカアーム５と、ロッカアーム５に中間部が支点アームピン８で揺動自在に軸支され、支点アームピン８を挟む位置に第１入力ローラ１５と第２入力ローラ１３とを有する揺動アーム６と、カム軸１に固定され、第１入力ローラ１５に接触して吸気バルブ４をリフトするカム２と、第２入力ローラ１３に接触するタペット２３を有し、作動油により容積変化されて、この変化に応じてタペット２３を出没駆動させる油圧室２９を備え、カム２のカム山によって吸気バルブ４がリフトしている間に、油圧室２９の容積を縮小してタペット２３を後退させて吸気バルブ４を任意のタイミングで閉じ動作させる油圧アクチュエータ２０を備える。【選択図】図７