COMPRESSION RATIO VARIABLE DEVICE FOR INTERNAL COMBUSTION ENGINE

• Main Authors: TAKI MASAFUMI, CHO MASAKI, IWAI KENTARO, OKANO NORIAKI
• Format: Patent
• Language: English; Japanese
• Published: 16.10.2023
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROLLING COMBUSTION ENGINES; CRANKCASE VENTILATING; ENGINE PLANTS IN GENERAL; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; LUBRICATING INTERNAL COMBUSTION ENGINES; LUBRICATING OF MACHINES OR ENGINES IN GENERAL; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; STEAM ENGINES; WEAPONS

To provide a compression ratio variable device for an internal combustion engine which can shorten the time required for the lubricant quantity to start increasing from the time of starting a compression ratio change or immediately before it, thereby reducing the time necessary for warmup operation, and also can reduce the overall size of the internal combustion engine.SOLUTION: A compression ratio variable device for internal combustion engines is used for changing a compression ratio of an internal combustion engine 10 and comprises: a control shaft 40 penetrating a crankshaft 20 in an axial direction and rotating an eccentric cam 31 by an intermediate gear 35; and an eccentric cam oil supply path 61 branched from an oil supply path 60, and supplying oil to slide-movement faces of the eccentric cam 31 and a crank pin 22, and the intermediate gear 35. A throttle valve 70 for changing an oil flow rate of the eccentric cam oil supply path 61 with the rotation of the control shaft 40 is arranged in the eccentric cam oil supply path 61, so that the time necessary for warmup operation can be shortened, and the overall size of the internal combustion engine can be reduced.SELECTED DRAWING: Figure 4 【課題】圧縮比の変更を開始する直前または変更開始時から潤滑油量が増加し始めるまでの時間を短くし、暖機運転にかかる時間を短縮するとともに、内燃機関全体を小型化することのできる内燃機関の圧縮比可変装置を提供する。【解決手段】内燃機関10の圧縮比を変更する内燃機関の圧縮比可変装置において、クランク軸20を軸方向に貫通して偏心カム31を中間ギア35により回動させるコントロール軸40と、給油路60から分岐し、偏心カム31とクランクピン22の摺動面と、中間ギア35とにオイルを供給する偏心カム給油路61を備え、偏心カム給油路61中に、コントロール軸40の回動に伴い偏心カム給油路61のオイル流量を変更させる絞り部70を備え、暖機運転の時間を短縮し、内燃機関全体を小型化することのできる内燃機関の圧縮比可変装置を提供する。【選択図】図４