Patent ID: 9470295
Filing Date: 2016-10-18
CPC Classification: F01L,F16H

Claim Text:
1. A hydraulic tensioner device used in a driving force-transmission mechanism for internal combustion engine including an endless transmission belt that transmits power while being wound around a driving member and a driven member, comprising: a plunger biased toward said endless transmission belt side to tighten looseness of the endless transmission belt; and a tensioner body in which a plunger accommodation hole for slidably accommodating the plunger is formed, a high hydraulic pressure chamber being configured by reserving oil fed through a check valve between said plunger and said plunger accommodation hole to attenuate reactive force acting on said plunger, wherein: said tensioner body includes, in a discharge oil passage for discharging oil leaked from said high hydraulic pressure chamber, a pressure maintenance valve for opening and closing the discharge oil passage; an air release passage is formed inside said pressure maintenance valve; and an air release valve for releasing air and preventing air from back flowing is provided in the air release passage.