BEARING MEMBER FOR VALVE GEAR

• Main Authors: YUDA KEIJI, KAMIYA SHU
• Format: Patent
• Language: English; Japanese
• Published: 03.08.2015
• 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 bearing member for a valve gear, capable of reducing friction.SOLUTION: A bearing member 34 for a valve gear 1 includes a cam shaft 20 having a cam 30 for opening/closing at least one of an intake valve and an exhaust valve and a plurality of journal parts 36. The bearing member 34 has a cam cap 38 downward supporting the journal parts 36 of the cam shaft 20 so as to encircle them, and a bearing base part 40 upward supporting them. On the inner peripheral face of the cam cap 38 opposed to the journal parts 36, a step part 46a is provided extending to the inner periphery side. An upstream side end 46c of the step part 46a is provided on the further downstream side than an upstream side mating face 38a of the cam cap 38, and a downstream side end 46d of the step part 46a is provided on the further upstream side than a downstream side mating face 38b of the cam cap 38. 【課題】フリクションを低減させることができる動弁装置の軸受部材を提供する。【解決手段】吸気バルブ、排気バルブの少なくとも一方を開閉させるカム３０と、複数のジャーナル部３６とを有するカムシャフト２０を備える動弁装置１の軸受部材３４において、軸受部材３４は、カムシャフト２０のジャーナル部３６を囲むように上方から支持するカムキャップ３８と、下方から支持する軸受基部４０と、を有し、カムキャップ３８のジャーナル部３６と対向する内周面に内周側へ張り出した段差部４６ａを設け、段差部４６ａの上流側端部４６ｃは、カムキャップ３８の上流側合わせ面３８ａよりも下流側に設けられ、段差部４６ａの下流側端部４６ｄは、カムキャップ３８の下流側合わせ面３８ｂよりも上流側に設けられる。【選択図】図５