Pump body with oil guide channel for lubricating between the end face of the inner ring and the contact face of the flange structure

A pump body, comprising:

• a flange structure;
• a bearing, the bearing being provided with an inner ring and an outer ring, the inner ring being rotatably disposed on the flange structure, and an end face of the inner ring being abutted against a contact face of the flange structure;
• and
• an oil guide channel provided inside a side wall of the inner ring, or inside the flange structure, or both inside the side wall of the inner ring and inside the flange structure, an outlet of the oil guide channel being positioned between the end face of the inner ring and the contact face of the flange structure, so as to introduce lubricating oil between the end face of the inner ring and the contact face of the flange structure;
• wherein the bearing further comprises:
• a retainer disposed between the outer ring and the inner ring;
• and
• a rolling element rotatably disposed on the retainer, a third channel being disposed in the rolling element, and the third channel being configured to introduce lubricating oil between an end face of the rolling element and a contact face of the retainer.