Power end of a pump

A single-piece cast frame, comprising:

• an outer wall;
• a plurality of bearing supports positioned at least partially within the outer wall, wherein the bearing supports are configured to surround at least a portion of a shaft;
• a plurality of ribs positioned at least partially between the outer wall and the bearing supports, wherein the ribs have a varying thickness;
• a plurality of crosshead tubes positioned at least partially within the outer wall, wherein a first radius exists between a first of the ribs and a first of the crosshead tubes, and wherein the first radius is from about 0.1 inches to about 3.0 inches;
• a lube rail positioned at least partially within the outer wall and defining an opening through the ribs, wherein the lube rail extends between the crosshead tubes, and wherein the lube rail is configured to provide lubricant to the crosshead tubes;
• and
• a nose plate, wherein the crosshead tubes are positioned at least partially between the bearing supports and the nose plate, wherein the nose plate varies in thickness, wherein a second radius exists between the first rib and the nose plate, and wherein the second radius is from about 0.1 inches to about 3.0 inches,
• wherein the outer wall, the bearing supports, the ribs, the crosshead tubes, the lube rail, and the nose plate are cast together in a mold to form the single-piece cast frame.

A single-piece cast frame for a power end of a pump, the frame comprising:

• an outer wall;
• a plurality of crankshaft bearing supports positioned at least partially within the outer wall, wherein the crankshaft bearing supports are configured to surround at least a portion of a shaft;
• a plurality of ribs positioned at least partially between the outer wall and the crankshaft bearing supports, wherein a first radius is defined between a first of the crankshaft bearing supports and a first of the ribs, wherein the first radius is from about 0.5 inches to about 20 inches, wherein the first rib comprises a first portion and a second portion, wherein the first portion of the first rib is thicker than the second portion of the first rib, wherein the first portion of the first rib has a thickness from about 2.5 inches to about 8.0 inches, wherein the second portion of the first rib has a thickness from about 0.5 inches to about 5.0 inches;
• a plurality of crosshead tubes positioned at least partially within the outer wall and at least partially radially-outward from the crankshaft bearing supports, wherein a first axial end of a first of the crosshead tubes is positioned proximate to the crankshaft bearing supports, wherein a second radius is defined between the first rib and the first crosshead tube, and wherein the second radius is from about 0.1 inches to about 3.0 inches;
• a lube rail positioned at least partially within the outer wall and defining an opening through the ribs, wherein the lube rail extends between the crosshead tubes, wherein the lube rail is configured to provide lubricant to the crosshead tubes, and wherein the second portion of the ribs is integral with and between the first portion of the ribs and the lube rail;
• and
• a nose plate positioned proximate to a second axial end of the first crosshead tube, wherein a third radius is defined between the first rib and the nose plate, and wherein the third radius is from about 0.1 inches to about 3.0 inches, wherein the nose plate comprises a first portion and a second portion, wherein the first portion of the nose plate is thicker than the second portion of the nose plate, wherein the first portion of the nose plate has a thickness from about 1.0 inch to about 12.0 inches, wherein the second portion of the nose plate has a thickness from about 0.25 inches to about 3.0 inches, wherein the first portion of the nose plate is integral with the second portion of the nose plate and the first rib, wherein a plane through the first portion of the nose plate is aligned with the first rib, and wherein a plane through the second portion of the nose plate is not aligned with the first rib,
• wherein the outer wall, the crankshaft bearing supports, the ribs, the crosshead tubes, the lube rail, and the nose plate are cast together in a mold, and wherein none of the crankshaft bearing supports, the ribs, the crosshead tubes, the lube rail, and the nose plate are fastened or welded together.