Tensioner

Abstract

A tensioner, in which an outer body and an inner body, which can deal with a tensioner mounting form required by various engines and a tension-imparting function, can be assembled. The inner body and a movement backward preventing mechanism, which form an inner body unit, can be unitized in a shape by which press-fitting and assembling is easy, and its efficient assembling production can be performed. A bodyof a tensioneris composed of outer and inner bodiesandof different members. The outer bodyis provided with a tensioner mounting means and an inner body fitting hole. The inner bodyis provided with a plunger accommodating holeinto which a plungerbiased by a compression springwas slidably fitted, and a movement backward preventing mechanismfor preventing the backward movement of the plungeris incorporated into the inner body. The movement backward preventing mechanismcomprises a rackformed on a part of the outer circumference of the plunger, a pawl bodypivotably supported with a pivot shaftin a cutaway groove formed on a front end of the inner body, and a spring, which biases a pawl of the pawl bodyso that the pawl engages the rack. An inner body side unitcomposed of at least the inner body, the movement backward preventing mechanism, the compression springand the plunger, is adapted to be press-fitted and fixed into the inner body fitting holeof the outer body