VALVE-OPENING/CLOSING TIMING CONTROL DEVICE

• Main Authors: NOGUCHI YUJI, ASAHI TAKEO
• Format: Patent
• Language: English; Japanese
• Published: 12.04.2018
• 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 valve-opening/closing timing control device which can suppress a variation of a relative rotation phase even if a leak amount of fluid flowing out of an advance chamber and a retardant chamber accompanied by a temperature rise is increased.SOLUTION: A first flow passage 33 for making a first port 38Ca of a cylindrical wall part 38C of an attachment member 38 for connecting a driven-side rotating body 30 to a camshaft 5 and an advance chamber Ca communicate with each other, and a second flow passage 34 for making a second port 38Cb of the cylindrical wall part 38C and a retardant chamber Cb communicate with each other are formed at the driven-side rotating body 30. A thermal expansion coefficient of the driven-side rotating body 30 is set larger than a thermal expansion coefficient of the attachment member 38, and a gap communication path 53 which circulates between a supply flow passage 35 and the first flow passage 33, between the supply flow passage 35 and the second flow passage 34, and between the first flow passage 33 and the second flow passage 34 is formed between an internal peripheral face of the driven-side rotating body 30 and an external peripheral face of the attachment member 38.SELECTED DRAWING: Figure 14 【課題】温度上昇に伴い進角室と遅角室とから流体のリーク量が増大する場合でも、相対回転位相の変動を抑制し得る弁開閉時期制御装置を構成する。【解決手段】従動側回転体３０をカムシャフト５に連結する取付部材３８の筒状壁部３８Ｃの第１ポート３８Ｃａと進角室Ｃａとを連通させる第１流路３３と、筒状壁部３８Ｃの第２ポート３８Ｃｂと遅角室Ｃｂとを連通させる第２流路３４とを従動側回転体３０に形成した。従動側回転体３０の熱膨張係数を、取付部材３８の熱膨張係数よりも大きくし、従動側回転体３０の内周面と取付部材３８の外周面との間に、供給流路３５と第１流路３３との間、供給流路３５と第２流路３４との間、および第１流路３３と第２流路３４との間、の少なくともいずれかで連通する間隙連通路５３を形成した。【選択図】図１４