Stepless speed variator of a belt type
 Rotation speed of automotive auxiliary machines is controlled by a drive pulley provided on a crank shaft and a driven pulley communicating with the drive pulley through a V-belt. The drive pulley comprises a rigid pulley secured on a drive shaft, a guide holder to be rotated together with the drive shaft by a mount bolt, and a slide pulley axially-movably located between the guide holder and the rigid pulley. The slide pulley provides a power piston to be moved along a guide holder shaft. The power piston, the guide holder flange, and the slide pulley define a power piston chamber. Inside of the power piston chamber are located a flyweight to be moved by centrifugal force and a servo valve to be axially moved by the flyweight. The servo valve is fitted on the outer peripheral surface of the power piston. The engine oil, supplied from an oil pan to the drive shaft, is conducted from a mount bolt into a power piston chamber through a power piston and a servo valve and conversely is returned from the power piston chamber to the oil pan through the passage on the outer peripheral surface of the mount bolt depending upon the action of the servo valve. 
Diesel Kiki Co., Ltd.
F
F16H
inventional
Hideya Tadashi Hachiro Junya
Kikuchi Kobayashi Aoki Kuronuma