VALVE BRIDGE AND MANUFACTURING METHOD OF THE SAME

To provide a valve bridge which is further improved to enable an oil to be collected sufficiently from a vent hole to supply air and the oil to a guide hole part properly and prevent scuffing of a fixed shaft by comprehensive reviewing including reviewing of a structure, a shape, and a forming method of the vent hole.SOLUTION: A valve bridge has a bridge body 5 which slidably fits on a fixed shaft 14 and transmits motion of a rocker arm 8 to a plurality of valves 1, 1. A guide hole part 16 in which the fixed shaft 14 is fitted is formed at the bridge body 5. A vent hole 17 which allows an upper end of the guide hole part 16 and the outside of the bridge 5 to communicate is provided. The vent hole 17 is set as an externally expanding hole in which a cross sectional area becomes larger in a direction away from the guide hole part 16.SELECTED DRAWING: Figure 5 【課題】通気孔の構造や形状、並びにその作り方までも含めた総合的な見直しにより、案内孔部へ適切に空気及びオイル供給できるように、通気孔から十分なオイル捕集が行え、かつ、固定軸のスカッフも生じないように、より改善されたバルブブリッジを提供する。【解決手段】固定軸１４に摺動可能に外嵌されるブリッジ本体５を有してロッカアーム８の動作を複数のバルブ１，１に伝えるバルブブリッジであって、固定軸１４を内嵌する案内孔部１６がブリッジ本体５に形成され、案内孔部１６の上端部とブリッジ５の外部とを連通させる通気孔１７が設けられ、通気孔１７は、案内孔部１６から遠ざかるに連れて断面積が大きくなる外拡がり状の孔に設定されている。【選択図】図５