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A balanced crankshaft mechanism for the two piston Stirling engine which permits the use of a single crankpin and eliminates side forces on the pistons. A triangular yoke has connected to its respective apexes the connecting rods for each piston and the crankpin. One end of a rocking lever is connec

A balanced crankshaft mechanism for the two piston Stirling engine which permits the use of a single crankpin and eliminates side forces on the pistons. A triangular yoke has connected to its respective apexes the connecting rods for each piston and the crankpin. One end of a rocking lever is connected to said yoke at a point between the points at which the connecting rods are attached. The other end of said rocking lever is connected to the base of the machine. As the crankpin rotates, the separate connecting rods and their respective pistons are moved with a phase relation appropriate for a two piston Stirling engine, and side forces are absorbed by the rocking lever, rather than by the pistons. A simple means of balancing the reciprocating inertial forces is described, which is also applicable to other types of Stirling engines.

대표청구항 ▼

A balance mechanism for a Stirling engine of the type which has two parallel cylinders and a yoke and which has a first piston reciprocating in one of said cylinders and a second piston reciprocating in the other of said cylinders, and which has a first connecting rod one end of which is rotatably a

A balance mechanism for a Stirling engine of the type which has two parallel cylinders and a yoke and which has a first piston reciprocating in one of said cylinders and a second piston reciprocating in the other of said cylinders, and which has a first connecting rod one end of which is rotatably attached to said first piston and the other end of which is rotatably attached to said yoke at a first point, and which has a second connecting rod one end of which is rotatably attached to said second piston and the other end of which is rotatably attached to said yoke at a second point, and which has a rocking lever one end of which is rotatably attached to a stationary pin and the other end of which is rotatably attached to said yoke at a third point equidistant between and on a line with said first and second points on said yoke, and which has a crankshaft with a single crankpin, which crankshaft is located equidistant between the extended axes of the two parallel cylinders, and which crankshaft rotates on an axis perpendicular to the plane on which said cylinder axes lie, and the crankpin of said crankshaft is rotatably attached to said yoke at a fourth point on said yoke which is equidistant from said first and second points and at a distance from said third point, and with the first piston constructed of such mass as will make the total reciprocating masses associated with one cylinder equal to the total reciprocating masses associated with said other cylinder, said balance means comprising; (a) counterbalance weight means attached to the crankshaft and rotating with it, exerting an inertial force radially opposite the crankpin of said crankshaft and in the same plane of rotation, said force being identical to that which would be exerted by a mass, equal to the reciprocating masses associated with one cylinder, rotating at the same angular velocity and at the same distance from the center of rotation as said crankpin, and; (b) a counterbalance shaft counter-rotating at the same angular velocity as said cRankshaft, on an axis parallel to that of said crankshaft and on the opposite side of said yoke from said crankshaft at a distance from said crankshaft equal to the product of the distance between the inertial centerlines of said reciprocating masses times the ratio of the distances on the yoke between said third point where the rocking lever is attached and said first point where the first connecting rod is attached, divided by the distance between said third point where the rocking lever is attached and said fourth point where the crankpin is attached, said counterbalance shaft balanced so as to exert equal radial inertial force, on the same plane, as said counterbalance weight means, and; (c) drive means for driving and synchronizing said crankshaft and said counterbalance shaft so they counter-rotate with equal angular velocity and their radial inertial forces act simultaneously in the same direction only on a line intersecting their respective axes of rotation.