Patent ID: 8757123
Filing Date: 2014-06-24
Classification: F01B,F02B,Y10T

Abstract:
1. An internal combustion engine, comprising: a first cylinder having a central axis; a second cylinder having a central axis parallel to the central axis of the first cylinder; a unitary crankshaft situated between the two cylinders and having at least five journals and four webs: a first piston disposed in the first cylinder and coupled to the central eccentric journal via a first pushrod; a second piston disposed in the second cylinder and coupled to the central eccentric journal via a second pushrod; a third piston disposed in the first cylinder and coupled to the front eccentric journal via a first pullrod and coupled to the rear eccentric journal via a second pullrod; and a fourth piston disposed in the second cylinder and coupled to the front eccentric journal via a third pullrod and coupled to the rear eccentric journal via a fourth pullrod, wherein: reciprocation of the pistons, the pushrods, and the pullrods generates an unbalanced inertia force; the front inner web includes a first counterweight; the rear inner web includes a second counterweight; the first and second counterweights cause the center of gravity to be displaced from the axis of rotation of the crankshaft to at least partially counteract the unbalanced inertia force; a crankshaft pulley coupled to the crankshaft; an accessory pulley counter rotating at the same speed as the crankshaft pulley with the crankshaft pulley and the accessory pulley engaged via a flexible member; an accessory shaft and an accessory coupled to and rotating with the accessory pulley; and a counterweight coupled to the accessory shaft.