CHAIN TENSIONER

• Main Authors: SATO SEIJI, TAKANO TAKEHIRO
• Format: Patent
• Language: English; Japanese
• Published: 26.09.2022
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

To provide a chain tensioner capable of effectively suppressing the mixture of air into a cylinder at starting an engine.SOLUTION: The chain tensioner includes an oil supply passage 31 provided in a cylinder 10 for introducing oil from an oil hole 30 opened to an engine cover 9 into a cylinder body part 10A, the oil supply passage 31 having an oil groove 32 formed in the surface of the cylinder 10 in opposition to the oil hole 30, and an oil introduction hole 33 formed in communication with the inside of the cylinder body part 10A through the oil groove 32, the oil introduction hole 33 being provided with an oil inlet 33a at a position on the lower side further than the oil hole 30, the oil groove 32 having a branch part 35 for the oil to flow therein while branching into an upward flow path 36 and a downward flow path 37.SELECTED DRAWING: Figure 2 【課題】エンジン始動時にシリンダの内部にエアが混入するのを効果的に抑制することが可能なチェーンテンショナを提供する。【解決手段】エンジンカバー９に開口する油孔３０からシリンダ本体部１０Ａの内部にオイルを導入するようにシリンダ１０に設けられた給油通路３１を有するチェーンテンショナにおいて、給油通路３１は、シリンダ１０の表面に油孔３０と対向して形成されたオイル溝３２と、オイル溝３２からシリンダ本体部１０Ａの内部に連通して形成されたオイル導入孔３３とを有し、オイル導入孔３３は、油孔３０よりも下側の位置にオイル入口３３ａをもつように設けられ、オイル溝３２は、上向き流路３６と下向き流路３７とに分岐して流す分岐部３５を有する。【選択図】図２