Rotary shaft lubricating structure

• Main Authors: NOBUYOSHI, TAKAMATSU, KENSUKE, NAKAMURA, MASAKAZU, YAMAZAKI, HIDEO, UESHIMA, CHIHARU, SHIMIZU, TORU, KANO, FUMINORI, KAWASHIMA, TOMOKI, OKITA
• Format: Patent
• Language: English; French; German
• Published: 13.08.1997
• Edition: 6
• Subjects: BEARINGS; BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CRANKCASE VENTILATING; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINE PLANTS IN GENERAL; 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; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; LUBRICATING INTERNAL COMBUSTION ENGINES; LUBRICATING OF MACHINES OR ENGINES IN GENERAL; MACHINES OR ENGINES IN GENERAL; MEANS FOR DAMPING VIBRATION; MECHANICAL ENGINEERING; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; SHOCK-ABSORBERS; SPRINGS; STEAM ENGINES; THERMAL INSULATION IN GENERAL; WEAPONS

An engine (E) has two balancer shafts (21,22) supported on two bearing bushings (52a,52b) which are made of the same material and mounted to a balancer holder. Lubricating oil passages (293,294,295) for supplying oil to the bearing bushings are defined offset upwards from the centers O of the bearing bushings (52) and by a distance delta . Each of the bearing bushings has two oil bores (52a1,52b2) having a center angle other than 180 DEG . The two oil bores in the bearing bushing of one balancer shaft communicate with the lubricating oil passages, and one of the oil bores in the bearing bushing of another balancer shaft communicates with the lubricating oil passage, while the other oil bore of that another balancer shaft is closed to keep out of the lubricating oil passage. Thus, downstream ends of the lubricating oil passages for supplying the oil to the bearing bushings of the plurality of rotary shafts can be closed without use of a special closing member such as a blind plug.