Honda Giken Kogyo Kabushiki Kaisha

Toshiaki Hiro

Koichi Fukuo

Mitsuhiro Shibata

Masahiko Matsumoto

Toshihiko Matsubara

Toshinari Sonoda

Hiroshi Shirai

Kazuhide Kumagai

Takashi Tatsumi

Hisashi Kanda

Masahiko Motsumoto

A valve operating device for operating an intake or exhaust valve in an internal combustion engine includes a cam having a cam profile including a valve lifting portion for applying a force to open the engine valve and a base circle portion for allowing the valve to be closed, the cam profile having a valve opening point and a valve closing point between the valve lifting portion and the base circle portion, a cam follower slidably engaging the cam, and a hydraulic lash adjuster combined with the cam follower for eliminating any gap between the means and the engine valve. The base circle portion has a gradient cam surface or a combination of different gradient cam surfaces for canceling out valve-lifting radial displacement of the base circle portion.

Valve operating device for use in internal combustion engine

A hydraulic circuit for a valve operation timing control device for an internal combustion engine which has a low-speed cam having a shape suited for low-speed operation of the engine, a high-speed cam having a shape suited for high-speed operation of the engine, the low- and high-speed cams being integrally formed on a camshaft rotatable in synchronism with a crankshaft, a first rocker arm held in slidable contact with the low-speed cam, a second rocker arm held in slidable contact with the high-speed cam. The first and second rocker arms are adjacent to and in slidable contact with each other and pivotably supported on a rocker shaft for relative angular displacement. There is a first oil feed passage for lubricating the low-speed cam and a second oil feed passage for lubricating the high-speed cam. The first rocker arm has a hydraulic lash adjuster and a relief valve is disposed in the oil passage for supplying oil pressure to said hydraulic lash adjuster for maintaining a predetermined oil pressure on the hydraulic lash adjuster.

Hydraulic circuit for a valve operating timing control device for an

A valve operating mechanism for an internal combustion engine has a low-speed cam for operating the intake or exhaust valves during low-speed operation of the engine and a high-speed cam for operating the intake or exhaust valves during high-speed operation of the engine. A low-speed lubricating oil passage is provided for supplying lubricating oil to the low-speed cam and a separate high-speed lubricating oil passage is provided for supplying lubricating oil to the high-speed cam. A control valve is connected to said low-speed and high-speed lubricating oil passages for selectively supplying maximum oil pressure to the high-speed lubricating oil passage during high-speed operation while restricting the rate of flow of oil during low-speed operation of the engine and supplying maximum oil pressure to the low-speed lubricating oil passage during low-speed operation of the engine while restricting or eliminating the oil supplied thereto during high-speed operation.

Valve operating device for internal combustion engine

Oil is supplied from an oil pump as working oil to hydraulic lash adjusters and also as lubricating oil to journals and cams of a camshaft. The oil passage system includes a first supply passage connected to the oil pump, a second supply passage connected between the first supply passage and a first distribution passage coupled to a group of hydraulic lash adjusters, a joint passage connected to the first distribution passage, and a second distribution passage coupled to the joint passage and connected to another group of hydraulic lash adjusters. The second distribution passage is connected by air vent passages to a lubricating oil passage which supplies the camshaft with the lubricating oil. The joint passage is connected to one of the camshaft journals by a relief passage having a relief valve.

Oil supply system for a valve operating mechanism in internal combustion

Growing community of inventors

Saitama, Japan

Toshiaki Hiro