Lock-up device

Abstract

A device, preferably hydraulic, is connectable to a first body and a second body selectively forming a rigid connection therebetween or allowing relative motion. The device includes a cylinder having a chamber. The cylinder is connectable to one of the bodies. A piston rod is connectable to the other body. A tension rod has a piston slidable in the chamber and is coupled to the piston rod for slidable movement relative thereto. A second piston is slidable in the chamber and slidable relative to the tension rod.

What is claimed is:  
     
         1 . A lock-up device comprising: 
 a cylinder having a chamber, the cylinder being connectable to one of the bodies;    a piston rod connectable to the other body; a tension rod having a piston slidable in the chamber and coupled to the piston rod for slidable movement relative thereto; and    a piston slidable in the chamber and slidable relative to the tension rod. Additional aspects include features like a port formed in the piston rod and passageway in the tension rod fluidly coupling the chamber to the port, and means for adjusting the length to achieve a desired lock-up force in combination with some or all of the aforementioned elements.