Diamond bearing for high-speed drag bits

A diamond bearing for a rotary rock bit comprising:

• a main bit body forming a first pin end and a second cutting end, said bit body further forms a chamber therein open to said first pin end to direct a source of coolant through said bit body;
• at least one support means for a rotary cutter adjacent said second cutting end of said bit, said support means forming a journal with bearing surfaces thereon;
• a rotary cutter mounted on said journal, said rotary cutter forming bearing surfaces opposing respective bearing surfaces formed by said journal;
• and
• said bearing surfaces having a multiplicity of separated diamond segments strategically positioned on and around said bearing surfaces, each of said diamond segments having at least one flat surface substantially aligned with a surface formed by said bearings, each of said diamond segments is attached to its respective bearing surface by a matrix material metallurgically bonded to said bearing surface, said source of coolant is directed through a passage formed between said bit body and said bearing surfaces to cool said diamond bearing segments during operation of said rotary rock bit.