Patent ID: 8746206

Claim:
An X-engine crank train comprising: a pair of Double-Acting Scotch Yoke assemblies, each one consisting of a first yoke, a second yoke attached to the first yoke at a first interface, a first piston attached to the first yoke at a second interface, and a second, opposing piston attached to the second yoke at a third interface such that the two pistons are at opposite ends of the Double-Acting Scotch Yoke assembly, wherein one leg of the first yoke and the second yoke includes a non-threaded hole, and the other leg of the first yoke and the second yoke includes a threaded hole for receiving a threaded fastener, and wherein the first and second yokes are attached to each other using two threaded fasteners that are diagonally opposite each other, and wherein the threaded fasteners attaching the first and second yoke of one of the pair of Double-Acting Scotch Yoke assemblies are non-parallel with respect to the threaded fasteners attaching the first and second yokes of the other one of the pair of Double-Acting Scotch Yoke assemblies, wherein the two Double-Acting Scotch Yoke assemblies are coupled to a crankshaft, and wherein the two Double-Acting Scotch Yoke assemblies are angularly offset relative to each other about the axis of the crankshaft, and wherein the two Double-Acting Scotch Yoke assemblies are offset relative to each other along the axis of the crankshaft, and wherein the threaded fasteners are accessible from two diagonally opposite corners.