INTERNAL COMBUSTION ENGINE CRANKSHAFT MAIN BEARING
PROBLEM TO BE SOLVED: To provide an internal combustion engine crankshaft main bearing having an excellent foreign matter discharge function while reducing oil leakage.SOLUTION: According to the present invention, a main bearing 19 constituted by a pair of semi-cylindrical bearings 17 and 18 is prov...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To provide an internal combustion engine crankshaft main bearing having an excellent foreign matter discharge function while reducing oil leakage.SOLUTION: According to the present invention, a main bearing 19 constituted by a pair of semi-cylindrical bearings 17 and 18 is provided. An oil groove 17a extending in a circumferential direction and arranged so that a center of an axial width matches that of an inlet opening 26 of a lubricant path 10a formed in a journal part 10 of a crankshaft is provided on an inner circumferential surface 17S of one semi-circular bearing 17. The oil groove 17a does not extend up to an axial groove 24A formed in a joint portion between the pair of semi-cylindrical bearings 17a and 18, so that a divided inner circumferential surface 17S' extends between a circumferential end portion 17E of the oil groove 17a and a circumferential end surface 17A of the semi-cylindrical bearing 17. A circumferential length L1 of the divided inner circumferential surface 17S' is smaller than a circumferential length L2 of the inlet opening 26, so that the oil groove 17a is communicable with the axial groove 24A via the inlet opening 26.
【課題】油の漏れ量を低減しつつ優れた異物排出機能を有する内燃機関のクランク軸用主軸受を提供すること。【解決手段】本発明によれば、一対の半円筒形軸受17、18から構成される主軸受19が提供される。一方の半円筒形軸受17の内周面17S上には、円周方向に延びる油溝17aであって、軸線方向幅の中央が、クランク軸のジャーナル部10に形成された潤滑油路10aの入口開口26の中心と整合するように配置される油溝17aが設けられる。油溝17aは、一対の半円筒形軸受17、18の接合部に形成された軸線方向溝24Aまで延びておらず、したがって油溝17aの円周方向端部17Eと半円筒形軸受17の円周方向端面17Aとの間には分離内周面17S'が延びている。分離内周面17S'の円周方向長さL1は入口開口26の円周方向長さL2より小さく、したがって油溝17aは入口開口26を介して軸線方向溝24Aと連通可能である。【選択図】図5 |
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