Unisia Jecs Corporation

Atsugi Unisia Corp.

Keio University

Pentax Ricoh Imaging Company, Ltd.

Tokyo Metropolitan Industrial Technology Research Institute

Hiroaki Imai

Seiji Suga

Hiroyuki Nakayama

Seiji Tsuruta

Hiroto Watanabe

Katsuhiko Uchida

Kazuhiro Yamada

Akinobu Maeyama

Akio Akasaka

Mineta Suzuki

Hideyuki Miyasaka

Takanobu Shiokawa

Masaharu Saito

Ikuo Misumi

Noboru Egashira

Takehisa Kondoh

Seija Suga

Yuya Oaki

Hirokazau Uehara

An anti-reflection coating comprising a mesoporous silica coating composed of mesoporous silica nano-particles formed on a substrate or a dense coating formed on the substrate, the mesoporous silica coating having a refractive index of more than 1.10 and 1.35 or less.

Anti-reflection coating and its production method

In an engine valve assembly, a valve lifter comprises a cylindrical main body portion and a head wall portion by which an opening of the cylindrical main body portion is enclosed and with which a cam is brought in contact, a valve stem is contacted on an axial center of the valve lifter and is disposed obliquely with respect to a direction of gravity, an exit of a lubricating oil supply bore is opened to an inner space of the head wall portion and is revolved due to a revolution of the valve lifter caused by a friction developed on the basis of a revolution of the cam, and a spring retainer supports an end of a valve spring, the spring retainer being attached onto the valve stem.

Engine valve assembly for internal combustion engine

An internal combustion engine has a sprocket driven by a timing chain in synchronization with the engine rotation and a camshaft for driving intake or exhaust valves. A valve timing control device of the engine comprises a first rotating member on which the sprocket is integrally formed; a second rotating member capable of making a relative rotation to the first rotating member and rotated together with the camshaft; a plurality of working fluid chambers defined between the first and second rotating members; and a charging/discharging means for charging and discharging a working fluid to and from the working fluid chambers to induce the relative rotation between the first and second rotating members. The sprocket and at least a base part of the first rotating member on which the sprocket is integrally formed are constructed of a porous metal member. Thus, the working fluid led into the working fluid chambers is allowed to penetrate into the sprocket through the base part thereby to bring about a sufficient lubrication of a portion where the sprocket and the timing chain are meshed. The porous metal member may be a sintered metal.

Valve timing control device of internal combustion engine

A camshaft phase changing device has a pair of axially-spaced annular front and rear gears disposed and engaged between co-axial drive and driven members. An annular piston is mounted to the annular rear gear by a plurality of piston pins. The piston pins pass through openings of the rear gear toward the front gear. Each of the openings is dimensioned to provide a clearance around the corresponding one of the piston pins and keep the rear gear out of contact with outer surface of the corresponding piston pin.

Camshaft phase changing device

A variable cam phaser (VCP) is disclosed in various modifications. The VCP includes a piston responsive to pressure in a fluid chamber having an inlet orifice and a plurality of outlets including a first outlet and a plurality of second outlets. A valve slide is movable to cover said second outlets one after another to pressurize the fluid chamber to displace the piston against a return spring. Outer and inner splined slides are drivingly mated with an internal helical spline of a cylindrical body secured to a sprocket and an external helical spline of a stub shaft secured to a camshaft. The splined slides are disposed between the piston and the return spring. Thus, movement of the piston and splined slides assembly in response to pressurization or depressurization of the fluid chamber advances or retards the valve timing or phase angle of the camshaft relative to the sprocket.

Variabe cam phaser for internal combustion engine

A valve timing control system for an internal combustion engine is provided. This system comprises a sprocket assembly connected to a crankshaft of the engine, a camshaft assembly connected to the sprocket assembly for driving intake and/or exhaust valves of the engine, a ring gear assembly disposed between the sprocket assembly and the camshaft assembly, and a fluid power source for providing fluid pressure to a pressure chamber to axially displace the ring gear assembly to vary a phase angle relation over a range of first to second phase angles. A fluid pressure supply and drain lines are defined in the system which communicates between the fluid power source and the pressure chamber and between the pressure chamber and a drain port of the system respectively. The system further includes a solenoid operated directional control valve which is responsive to a control signal from a controller to selectively block the fluid pressure supply or drain lines according to variation in engine operating conditions for varying the valve timing.

Valve timing control system for internal combustion engine

A variable intake- and/or exhaust-valve timing control system for an internal combustion engine comprises a cam sprocket having a driven connection with an engine crankshaft, a camshaft, a ring gear provided between the camshaft and the cam sprocket for adjusting a relative phase angle between the cam sprocket and the camshaft, and a ring gear drive mechanism for drivingly controlling the ring gear via fluid pressure created by an engine oil pump, depending upon the operating state of the engine. The drive mechanism includes a subsidiary oil pump for supplying a fluid pressure greater than a designated pressure level to the ring gear, during low engine speed and high engine load.

Intake- and/or exhaust-valve timing control system for internal

A valve timing control system includes a timing sprocket, a camshaft, a sleeve secured to the camshaft and accomodated within the timing sprocket. A helical piston assembly and a floating piston are movably disposed in an annular space between the timing sprocket and the sleeve. An end plug is disposed at one end of the timing sprocket to close one end of the annular space. First and second chambers are defined between the floating piston and the end plug and between the floating piston and the helical piston assembly, respectively. A valve spool is operatively connected to an actuator and movably disposed in the sleeve. The valve spool moves among first, second and third positions. At the first position, the first and second chambers are drained. At the second position, the first chamber is communicated with a hydraulic fluid pump and the second chamber is drained. At the third position, the first and second chambers are communicated with the hydraulic fluid pump.

Growing community of inventors

Kanagawa, Japan

Hiroaki Imai