Double row roller cam transmission mechanism with backlash adjustment means

A backlash-free double row roller cam transmission mechanism, comprising:

• a first passive wheel comprising a first rotating wheel and a plurality of first rollers, said first rotating wheel comprising a first wheel body providing a circular periphery, said first rollers being pivotally arranged on the circular periphery of said first wheel body away from the center of said first passive wheel;
• a second passive wheel comprising a second rotating wheel and a plurality of second rollers, said second rotating wheel comprising a second wheel body providing a circular periphery, said second rollers being pivotally arranged on the circular periphery of said second wheel body away from the center of said second passive wheel;
• and
• a transmission camshaft connected between said first passive wheel and said second passive wheel, said transmission camshaft comprising a spiral protrusion, said spiral protrusion comprising an inner surface and an outer surface respectively located on two opposite sides thereof, said inner surface being abutted against said first rollers of said first passive wheel, said outer surface being abutted against said second rollers of said second passive wheel;
• wherein when said transmission camshaft is driven, said first passive wheel and said second passive wheel are relatively pivoted, and the reverse thrust of said first rollers and said second rollers is generated by the principle of oblique wedge adjustment, thereby eliminating the backlash between said first rollers and said inner surface and the backlash between said second rollers and said outer surface.