Pump assembly using a shell bearing with a partial groove

A pump assembly, comprising:

• a bearing housing having a bore configured to receive a crankshaft;
• a connecting rod connected to the bearing housing at a first end of the connecting rod and connected to a crosshead at a second end of the connecting rod via a wrist pin,
• the connecting rod including a lubrication channel that extends within the connecting rod;
• a shell bearing in the bore of the bearing housing retaining the crankshaft, the shell bearing having an inner surface and an outer surface;
• and
• a lubrication conduit fluidly connected to the lubrication channel in the connecting rod between the second end of the connecting rod and an end of the lubrication channel at the first end of the connecting rod, wherein the shell bearing has a groove that extends only partially around the inner surface of the shell bearing where the inner surface of the shell bearing, on a side of the shell bearing opposite the connecting rod, is uncontacted by the crankshaft in a forward stroke of the crosshead, and the groove extends halfway or 1 less than halfway around the inner surface of the shell bearing.

A pump assembly, comprising:

• a bearing housing having a bore;
• a connecting rod connected to the bearing housing at a first end of the connecting rod and connected to a crosshead at a second end of the connecting rod via a wrist pin,
• the connecting rod including a lubrication channel that extends within the connecting rod;
• and
• a shell bearing in the bore of the bearing housing, the shell bearing having an inner surface and an outer surface,
• wherein a portion of the inner surface of the shell bearing that contacts a crankshaft in a forward stroke of the crosshead is uninterrupted by a groove or an aperture configured to direct lubrication fluid to the lubrication channel of the connecting rod, and wherein another portion of the inner surface of the shell bearing which is uncontacted by the crankshaft in the forward stroke of the crosshead has the groove and the aperture.