Piston engine balancing

Abstract

A piston assembly includes first and second pistons, a transition arm coupled to each of the pistons, and a rotating member rotating in a first direction about a first axis. The transition arm includes a drive member coupled to the rotating member off-axis of the rotating member. A first counterbalance is mounted to rotate in the first direction, and a second counterbalance is mounted to rotate in a second direction opposite the first direction. The second counterbalance rotates about a second axis offset and parallel to the first axis. Alternatively, the second counterbalance rotates about the first axis. A method of counterbalancing a piston assembly includes mounting a first counterbalance to the piston assembly to rotate in the first direction, and mounting a second counterbalance to the piston assembly to rotate in the second direction.

1 . A piston assembly, comprising: 
 first and second pistons,    a transition arm coupled to each of the pistons, the transition arm including a drive member,    a rotating member, the drive member being coupled to the rotating member off-axis of the rotating member, the rotating member rotating in a first direction,    a first counterbalance mounted to rotate in the first direction, and    a second counterbalance mounted to rotate in a second direction opposite the first direction.    
   
   
       2 - 36 . (canceled)