Abstract: A chain tensioner has a plunger (14) slidably fitted in a bottomed cylinder (12) formed in a housing (11), and configured to resiliently urge the plunger (14) by a return spring (13) in the direction along which the plunger (14) is projected out from the cylinder (12), wherein the chain tensioner is configured to attach an engagement clip (19) to the opening of the cylinder (12), and to provide an engagement portion engageable with the engagement clip (19) to the end of the plunger (14) on the projection side thereof, so as to allow the engagement clip (19) and the engagement portion to engage with and disengage from each other corresponding to the position of rotation of the plunger (14).

Abstract: A chain tensioner (1) having a plunger (12) slidably assembled in a cylinder portion (13) together with a return spring (11), the chain tensioner (1) further has a stopper plate (22) having a through-hole (22a) formed therein, through which the plunger (12) is inserted; and a biasing member (24) disabling movement of the plunger (12), by applying a biasing force to the end of the stopper plate (22) so as to incline the stopper plate (22), the chain tensioner is configured to apply a hydraulic pressure of a hydraulic oil of an engine to the stopper plate (22), so as to reduce the inclination of the stopper plate (22) against the biasing force applied by the biasing member (24), to thereby allow movement of the plunger (12).

Abstract: A chain tensioner (1) having a plunger (12) slidably assembled in a cylinder portion (13) together with a return spring (11), the chain tensioner (1) further has a stopper plate (22) having a through-hole (22a) formed therein, through which the plunger (12) is inserted; and a biasing member (24) disabling movement of the plunger (12), by applying a biasing force to the end of the stopper plate (22) so as to incline the stopper plate (22), the chain tensioner is configured to apply a hydraulic pressure of a hydraulic oil of an engine to the stopper plate (22), so as to reduce the inclination of the stopper plate (22) against the biasing force applied by the biasing member (24), to thereby allow movement of the plunger (12).

Abstract: A chain tensioner has a plunger (14) slidably fitted in a bottomed cylinder (12) formed in a housing (11), and configured to resiliently urge the plunger (14) by a return spring (13) in the direction along which the plunger (14) is projected out from the cylinder (12), wherein the chain tensioner is configured to attach an engagement clip (19) to the opening of the cylinder (12), and to provide an engagement portion engageable with the engagement clip (19) to the end of the plunger (14) on the projection side thereof, so as to allow the engagement clip (19) and the engagement portion to engage with and disengage from each other corresponding to the position of rotation of the plunger (14).

Abstract: The invention provides a tensioner initial position setting device for a tensioner having a housing, a plunger slidably mounted within the housing, and shoes mounted opposite the bottom of the plunger and the top of the housing, wherein it further including concave grooves or penetration holes formed on both lateral sides of each shoe, and a set wire inserted into said concave grooves or holes with both ends of said set wire tied together, thereby preventing the plunger from projecting. The tensioner initial position setting device can easily release an initial position of a tensioner mounted in a limited space in a state in which an initial position is set so as to prevent the plunger from projecting.