CRANK SHAFT BEARING STRUCTURE

To provide a crank shaft bearing structure capable of reducing an amount of oil leakage from a part between a crank journal and a journal bearing at both ends of a shaft, even in being applied to an engine with an odd number of cylinders.SOLUTION: A crank shaft bearing structure 100 is applied to a...

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Bibliographic Details
Main Authors KUMAGAI KOJI, WADA SHIGERU, ONDA TAKAHIRO, MISAKI YUKIO, TAMASATO HIROTAKA, SASAKI TATSUNORI
Format Patent
LanguageEnglish
Japanese
Published 20.03.2023
Subjects
ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
BEARINGS
BLASTING
COMBUSTION ENGINES
CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES
ELEMENTS OR CRANKSHAFT MECHANISMS
ENGINEERING ELEMENTS AND UNITS
FLEXIBLE SHAFTS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MECHANICAL ENGINEERING
ROTARY BODIES OTHER THAN GEARING ELEMENTS
SHAFTS
THERMAL INSULATION IN GENERAL
WEAPONS
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Summary:To provide a crank shaft bearing structure capable of reducing an amount of oil leakage from a part between a crank journal and a journal bearing at both ends of a shaft, even in being applied to an engine with an odd number of cylinders.SOLUTION: A crank shaft bearing structure 100 is applied to a five-cylinder engine. A crank shaft 1 extends in a direction along a shaft center Ax1 and has six crank journals 11-16 and five crank pins 27-31. The crank journals 12, 13, 15 are connected to in-shaft oil passages 56-62 for supplying oil to the crank pins 27-31 respectively adjacent thereto. A journal bearing having a peripheral groove extending in a circumferential direction and connected to an oil hole on an inner peripheral surface is annularly mounted on the crank journals 12, 13, 15, and a journal bearing not having a peripheral groove on an inner peripheral surface is annularly mounted on the crank journals 11, 14, 16.SELECTED DRAWING: Figure 2 【課題】奇数気筒のエンジンに適用される場合においても、軸両端におけるクランクジャーナルとジャーナルベアリングとの間からのオイルの漏れ量の低減を図ることができるクランクシャフト軸受構造を提供する。【解決手段】クランクシャフト軸受構造１００は、５気筒のエンジンに適用される。クランクシャフト１は、軸心Ａｘ１に沿った方向に延び、６つのクランクジャーナル１１～１６と、５つのクランクピン２７～３１とを有する。クランクジャーナル１２，１３，１５には、それぞれに隣接するクランクピン２７～３１にオイルを供給するシャフト内油路５６～６２が接続されている。クランクジャーナル１２，１３，１５には、内周面に周方向に延びるとともに、油孔に繋がる周溝を有するジャーナルベアリングが環装され、クランクジャーナル１１，１４，１６には、内周面に周溝を有さないジャーナルベアリングが環装される。【選択図】図２
Bibliography:Application Number: JP20210145879