Abstract: A chain tensioner apparatus includes a mounting bracket adapted for connection to an associated engine block. The mounting bracket defines a pivot point and a support surface. A blade is connected to the bracket and includes: (i) first and second opposite end portions joined together by a central portion; (ii) a hub defined by the first end portion; and, (iii) a first end wall connecting the hub to the central portion. The hub of the blade is pivotably connected to the bracket at the pivot point and the second end of the blade abuts the support surface. The blade defines an exterior chain guide surface adapted for slidingly abutting an associated chain of an associated chain drive system. The chain tensioner apparatus further includes a tensioning spring connected to the blade, the spring having opposite first and second ends located respectively adjacent the first and second opposite end portions of the blade. The spring contacts and exerts a biasing force on the central portion of the blade.

Abstract: A chain tensioner apparatus utilizes a synthetic plastic (e.g. nylon) bracket that permits a fastener at a pivot end of the bracket to serve as a pivot pin for a shoe sub-assembly as well as a bracket fastener. A free end fastener can be positioned very close to, or substantially below, a reaction surface of the bracket. An interlocking feature is provided at a pivot end of the bracket/shoe sub-assembly and serves to maintain an interlock of the shoe-to-bracket in cooperation with an installation pin. Additionally, a positioning feature is used at the pivot end of the bracket. In order to permit the free rotation of the shoe relative to the bracket, the pivot end of the bracket is not clamped rigidly to the engine case when a pivot end bolt is installed. Further, a dowel pin can be used at the pivot end of the bracket.

Abstract: A chain tensioner apparatus includes a mounting bracket adapted for connection to an associated engine block. The mounting bracket defines a pivot point and a support surface. A blade is connected to the bracket and includes: (i) first and second opposite end portions joined together by a central portion; (ii) a hub defined by the first end portion; and, (iii) a first end wall connecting the hub to the central portion. The hub of the blade is pivotably connected to the bracket at the pivot point and the second end of the blade abuts the support surface. The blade defines an exterior chain guide surface adapted for slidingly abutting an associated chain of an associated chain drive system. The chain tensioner apparatus further includes a tensioning spring connected to the blade, the spring having opposite first and second ends located respectively adjacent the first and second opposite end portions of the blade. The spring contacts and exerts a biasing force on the central portion of the blade.

Abstract: A mechanical chain tensioner for automotive engine timing drives. This invention relates to a tensioner that must be packaged in a confined space and having limited access for installation. This tensioner with a shoe and spring is the last timing component to be installed and fastened to the engine using a shoulder bolt, and this is done after its support bracket, if used, and the timing chain and sprockets are already in place. In addition, the tensioner includes a retaining feature that assures the spring will remain within the shoe during shipping, installation, and use of the tensioner.