Patent ID: 6811505
Filing Date: 2004-11-02
Classification: F16H

Abstract:
A hydraulic tensioner comprising a body having a cylindrical hole with a bottom at its inner end provided with an inlet hole smaller in diameter than the diameter of said cylindrical hole, and a hollow cup-shaped metallic cylinder fitted to said cylindrical hole, said hollow cylinder having a hollow cylindrical wall and a bottom plate formed as one piece with said cylinder, an external diameter corresponding to the diameter of said cylindrical hole, and said wall having an internal diameter providing an interior wall around said hollow cylinder, a plunger provided within the cylinder, and a compression spring within said internal diameter to engage said plunger and urge an outer end of the plunger to protrude from the body, the inner end of the plunger forming a pressure oil chamber within said interior wall between the inner end of the plunger and the cylinder bottom plate,said cylinder bottom plate having a through-hole allowing the inflow of oil into the inner end of said pressure chamber, said through-hole registering with said inlet hole, the outer end of said pressure chamber being closed by said plunger, and the bottom plate being prevented from dropping out from the body by said compression spring bearing against the outward surface of said bottom plate between said hollow cylindrical wall and said through-hole, and and a check valve mechanism abutting the inward surface of said bottom plate of said cylinder, fitted to the inlet hole and prevented from dropping out by the abutment on the bottom plate of said cylinder.