Oil supply system in internal combustion engine

Abstract

Abstract In an internal combustion engine (E) comprising a valve operating device (1) which is disposed in a cylinder head (H c ) coupled to an upper surface of a cylinder block (E) and which includes a valve operating cam shaft (3) connected to a crank shaft (5) rotatably carried in a lower engine body (E l ) portion including the cylinder block (B c ), and valve operation characteristic changing means (4) for changing, in accordance with a variation in hydraulic pressure in a hydraulic pressure chamber (41), the operation characteristic of an engine valve (V) which is supported in the cylinder head for opening and closing, a lower oil supply system (O l ) and an upper oil supply system (O u ) are disposed independently of each other. The lower oil supply system (O l ) is comprised of a first oil pump (P₁) connected to individual oil consumption parts (9) disposed in a lower engine body portion (E l ) for supplying a first oil, and the upper oil supply system (O u ) is comprised of a second oil pump (P₂) connected to individual oil consumption parts (10) included in the valve operating device (3) as well as to the hydraulic pressure chamber for supplying a second oil. This ensures that the second oil pump (P₂) can be disposed in proximity to the hydraulic pressure chamber (41), so that an oil having a characteristic suitable for the operation of the valve operation characteristic changing means can be supplied quickly, and the cycle of replacement of the oil in the upper oil supply (O u ) system can be prolonged.

Inventors

• 👤 Yasuhiro C/O K. K. Honda Gijutsu Kenkyusho Urata
• 👤 Kazuhide C/O K. K. Honda Gijutsu Kenky. Kumagai
• 👤 Shigeru C/O K. K. Honda Gijutsu Kenkyusho Suzuki

Bibliographic Details