Patent ID: 6203461
Filing Date: 2001-03-20
Classification: F16H

Abstract:
A hydraulic tensioner comprising:a tensioner body having a plunger receiving hole;a plunger slidably fitted in said plunger receiving hole and urged by a spring so that one end of said plunger projects outwards from said plunger receiving hole, said plunger defining within said plunger receiving hole a high-pressure chamber; anda ball check valve having a hollow bore defining an oil passage allowing oil to be introduced into said high-pressure chamber, and a check ball disposed between said oil passage and said high-pressure chamber to permit the flow of oil only in a direction from said oil passage toward said high-pressure chamber;said ball check valve hollow bore terminating in a valve seat, said check ball resting on said valve seat when the valve is closed, said oil passage extending through said valve seat, said valve seat having an outwardly diverging tapered seating surface having a divergent angle of at least 60.degree. and less than 90.degree., said check ball having a mass of 0.1 g or less.