Importance

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Abstract

In order to provide a plunger retraction preventing mechanism and to reduce the outside dimension of a housing, an inner ratchet chain tensioner includes a housing in which a cylinder is formed, a cylindrical plunger having a bottom and slidable in the cylinder by oil pressure, a flanged cylindrical body erecting from a bottom of the cylinder and on an outer periphery of which the plunger is slidably fitted, a return spring contained in the flanged cylindrical body to urge the plunger in a protruding direction, and a ratchet mechanism to prevent retraction of the plunger, and the ratchet mechanism includes a register ring containing groove formed on an inner peripheral part of the plunger, plural circumferential grooves formed at constant intervals on an outer periphery of a tube part of the flanged cylindrical body, and a register ring fitted between the register ring containing groove and the circumferential groove.

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First Claim