Orbiting crankshaft drive pin and associated drive pin sleeve geometry

A compressor crankshaft assembly comprising:

• a crankshaft;
• a cylindrical orbital bearing;
• a cylindrical main bearing;
• and
• an eccentric drive pin extending from one end of the crankshaft, wherein a shape of the drive pin viewed into an end of the drive pin is defined by a common portion formed by a first cylinder overlapping with a second cylinder, the common portion includes a first arcuate portion which is defined by a radius of the first cylinder and a second arcuate portion which is defined by a radius of the second cylinder, the radius of the second cylinder is greater than the radius of the first cylinder, a cross section of the common portion is asymmetrical relative to a horizontal central axis of the first cylinder and is asymmetrical relative to a horizontal central axis of the second cylinder, and the first cylinder is coaxial with the cylindrical orbital bearing, and the second cylinder is coaxial with the cylindrical main bearing.

A compressor assembly comprising:

• a horizontal main bearing housing comprising a fluid inlet and a fluid outlet;
• a first, input stage disposed within the horizontal main bearing housing and configured to receive and compress a fluid via the fluid inlet, the first, input stage comprising:
• a first, fixed scroll member;
• and
• a first, orbiting scroll member in meshing engagement with the fixed scroll member;
• a second, output stage disposed within the horizontal main bearing housing and configured to further compress and discharge the fluid via the fluid outlet, the second, output stage comprising:
• a second, fixed scroll member;
• and
• a second orbiting scroll member in meshing engagement with the second, fixed scroll member;
• a cylindrical main bearing;
• a cylindrical orbital bearing;
• and
• a crankshaft rotatably journaled in the cylindrical main bearing, which is disposed within the horizontal main bearing housing, the crankshaft comprising:
• a first eccentric drive pin extending from a first end of the crankshaft such that the first eccentric drive pin engages the first, orbiting scroll member;
• and
• a second eccentric drive pin extending from a second end of the crankshaft such that the second eccentric drive pin engages the second, orbiting scroll member,
• wherein a shape of at least one of the first eccentric drive pin and the second eccentric drive pin viewed into an end thereof is defined by a common portion formed by a first cylinder overlapping with a second cylinder, the common portion includes a first arcuate portion which is defined by a radius of the first cylinder and a second arcuate portion which is defined by a radius of the second cylinder, the radius of the second cylinder is greater than the radius of the first cylinder, a cross section of the common portion is asymmetrical relative to a horizontal central axis of the first cylinder and is asymmetrical relative to a horizontal central axis of the second cylinder, the first cylinder is coaxial with the cylindrical orbital bearing, which is journaled and installed to receive the at least one of the first eccentric drive pin and the second eccentric drive pin, and the second cylinder is coaxial with the cylindrical main bearing, which is journaled and installed to rotatably receive the crankshaft.

A compressor crankshaft assembly comprising:

• a main bearing housing;
• a cylindrical main bearing;
• a cylindrical orbital bearing;
• and
• a crankshaft rotatably journaled in the cylindrical main bearing, the cylindrical main bearing being disposed within the main bearing housing, the crankshaft comprising:
• a first eccentric drive pin extending from one end of the crankshaft, wherein a shape of the first eccentric drive pin viewed into an end of the first eccentric drive pin is defined by a common portion formed by a first cylinder overlapping with a second cylinder, the common portion includes a first arcuate portion which is defined by a radius of the first cylinder and a second arcuate portion which is defined by a radius of the second cylinder, the radius of the second cylinder is greater than the radius of the first cylinder, a cross section of the common portion is asymmetrical relative to a horizontal central axis of the first cylinder and is asymmetrical relative to a horizontal central axis of the second cylinder, the first cylinder is coaxial with the cylindrical orbital bearing, which is journaled and installed to receive the first eccentric drive pin, and the second cylinder is coaxial with the cylindrical main bearing, which is journaled and installed to rotatably receive the crankshaft.

A parallel-flow compressor assembly comprising:

• a horizontal main bearing housing;
• a first stage disposed within the horizontal main bearing housing and configured to receive and compress a fluid via a fluid inlet and discharge the fluid via a fluid outlet, the first stage comprising:
• a first, fixed scroll member;
• and
• a first, orbiting scroll member in meshing engagement with the fixed scroll member;
• a second stage disposed within the horizontal main bearing housing and configured to receive and compress a fluid via a fluid inlet and discharge the fluid via a fluid outlet, the second stage comprising:
• a second, fixed scroll member;
• and
• a second orbiting scroll member in meshing engagement with the second, fixed scroll member;
• one or more cylindrical main bearings;
• a cylindrical orbital bearing;
• and
• a crankshaft rotatably journaled in the one or more cylindrical main bearings, the one or more cylindrical main bearings being disposed within the horizontal main bearing housing, the crankshaft comprising:
• a first eccentric drive pin extending from a first end of the crankshaft such that the first eccentric drive pin engages the first, orbiting scroll member;
• and
• a second eccentric drive pin extending from a second end of the crankshaft such that the second eccentric drive pin engages the second, orbiting scroll member,
• wherein a shape of at least one of the first eccentric drive pin and the second eccentric drive pin viewed into an end thereof is defined by a common portion formed by a first cylinder overlapping with a second cylinder, the common portion includes a first arcuate portion which is defined by a radius of the first cylinder and a second arcuate portion which is defined by a radius of the second cylinder, the radius of the second cylinder is greater than the radius of the first cylinder, a cross section of the common portion is asymmetrical relative to a horizontal central axis of the first cylinder and is asymmetrical relative to a horizontal central axis of the second cylinder, the first cylinder is coaxial with the cylindrical orbital bearing, which is journaled and installed to receive the at least one of the first eccentric drive pin and the second eccentric drive pin, and the second cylinder is coaxial with the one or more cylindrical main bearings, journaled and installed to rotatably receive the crankshaft.