The Principle Of Hydraulic Tensioner

The bearing body is provided on the bearing surface of the housing that supports the end of the rotating body, and precision grinding is performed on the contact surface of the bearing body with the end of the rotating body to make the initial surface accuracy and the surface roughness after use The same degree, and the flatness of the contact surface is flattened with high precision to prevent the change of performance and stabilize the performance. It has: a housing; a rotating body, which is rotatably and accommodated in the housing in a state in which movement along the axis direction is restricted; a pressing body, which is in threaded engagement with the rotating body, can move in the axis direction, and is relative to the housing The rotation of is constrained and subjected to the axial load from the force transmission member; the spring is housed inside the housing and applies a rotating force to the rotating body, and the tensioner converts the rotating force of the rotating body into The thrust force in the axial direction of the pressing body is characterized in that the end of the rotating body is rotatably supported by a bearing body provided on the receiving surface of the housing to receive the load acting on the pressing body, and the bearing The accuracy of the contact surface on the body with the end of the rotating body is such that the surface roughness is Rmax 4.0S or less and the flatness is 2 μm or less.