Abstract: One or more radial holes in the body of the hydraulic tensioner are used to control outward hydraulic flow restriction from the hydraulic pressure chamber within the piston. The one or more holes can be arranged in different ways to allow the piston position to alter the outward oil flow of the tensioner.

Abstract: A tensioner for tensioning a chain or belt span which uses two pistons. The movement of the two pistons may be coupled together. The first piston provides damping to the chain span and a second piston provides variable, dominant and automatically adjusting spring force to the chain span. The tensioner automatically adjusts the mean tension force to keep the chain or belt tension as low as possible without sacrificing chain or belt control, significantly improving drive efficiency at new chain or belt conditions and conditions with dynamic loads.

Abstract: An apparatus and method relating to a variable compression connecting rod system (10, 110) located in an internal combustion engine including a connecting rod (28, 128) having a piston-pin-receiving aperture defining a first longitudinal axis in a first end portion and a crank-pin-receiving aperture defining a second longitudinal axis in a second end portion (36), a hydraulically actuated eccentric rotor (52) rotatable about one of the first and second longitudinal axis in response to fluid pressure acting on expandable chambers (76a, 76b, 78a, 78b, 176a, 176b, 178a, 178b) defined between the rotor (52, 152) and the connecting rod (28, 128). A hydraulic actuation system (51, 151) including a fluid pressure actuated activation valve (58, 158), at least one check valve (62, 64), and a plurality of fluid passages (66, 66a, 66b, 66c, 66d, 166) in fluid communication with the expandable chambers (76a, 76b, 78a, 78b, 176a, 176b, 178a, 178b).

Abstract: A tensioner for tensioning a chain or belt span which uses two pistons. The movement of the two pistons may be coupled together. The first piston provides damping to the chain span and a second piston provides variable, dominant and automatically adjusting spring force to the chain span. The tensioner automatically adjusts the mean tension force to keep the chain or belt tension as low as possible without sacrificing chain or belt control, significantly improving drive efficiency at new chain or belt conditions and conditions with dynamic loads.

Abstract: A tensioner system for an engine including at least one driven sprocket, at least one driving sprocket, a chain, and a tensioner for tensioning the chain. The damping of the tensioner is actively controlled by a valve that allows fluid to exit the tensioner.

Abstract: A portable, detachable headrest for easy attachment to a soft back or fully padded chair without a need for exposed framework. When the back of the chair is received between a fixed jaw and a moveable jaw of the headrest, the moveable jaw firmly compresses the back of the chair between the moveable jaw and the fixed jaw, mounting the headrest stably to the back of the chair. The headrest is adjustable in a vertical direction and an anterior and posterior direction, such that the user's shoulders and/or back have contact with the chair back in which the headrest is connected to.