Mazda Motor Corporation

Mazda Motor Corporat Ion

Ikuma Takahashi

Masaki Fukuma

Masahiro Naito

Kouichi Shimizu

Akira Asai

Kenya Ishii

Kazuhiro Tomizawa

Masahiro Koizumi

Takeyoshi Iwagami

Shota Kabasawa

An accessory drive system for an engineincludes: a drive shaft (a crankshaft); a driven shaft (an oil pump drive shaft); an endless transmission member (a drive chain); a first tensioner disposed on a slack side of the endless transmission member (a first hydraulic tensioner); and a second tensioner disposed on a tight side of the endless transmission member (a second hydraulic tensioner). The second tensioner has a damping function to damp pushing force applied to the second tensioner by the endless transmission member in a direction opposite to a biasing direction.

Accessory drive device for engine

In the variable valve timing system according to the present invention, portions of the intake-side advancing hydraulic line and a retarding hydraulic line respectively constitute annular groovesandfor advancing and retarding provided on the intake camshaftbearing surfaceof the cam capwhich supports the camshaftsand. In addition, portions of the advancing hydraulic line and the retarding hydraulic line for exhaust respectively constitute annular grooves for advancing and retardingandprovided on the exhaust camshaftbearing surfaceof the cam cap. Moreover, the annular groove for retardingon the intake camshaftbearing surfaceand the annular groove for advancingon the exhaust camshaftbearing surfaceare respectively provided in the center in the width direction of their respective bearing surfacesand

Engine variable valve timing system

Growing community of inventors

Hiroshima, Japan

Ikuma Takahashi