Torque transmission coupling

In a coupling for transmitting rotary power, said coupling comprising:

• a. a plurality of flexible laminar elements;
• b. first means for holding said laminar elements in facing relationship, thereby creating a coupling flexing element having a coupling axis and two axial faces;
• c. a first hub integral with or adapted to be connected to a shaft for the transmission of rotary power;
• and
• d. second means for mounting said coupling flexing element on said first hub, the improvement wherein
• e. said first hub has at least one precision-finished radially symmetric surface the axis of which is at least approximately coincident with the coupling axis and
• f. the coupling further comprises
• i. a first pilot ring alignment means having at least one precision-finished radially symmetric surface dimensioned to complement the precision-finished radially symmetric surface on said first hub for aligning said first hub and said coupling flexing element and
• ii. third means for affixing said first pilot ring to a first axial face of said coupling flexing element such that the axis of the precision-finished radially symmetric surface is coincident with the coupling axis.

A sub-assembly for a coupling for transmitting rotary power, said sub-assembly comprising:

• a. a plurality of flexible laminar elements;
• b. first means for holding said laminar elements in facing relationship, thereby creating a coupling flexing element having a coupling axis and two axial faces;
• c. a first pilot ring alignment means having at least one precision-finished radially symmetric surface for aligning said coupling flexing element with a first hub;
• and
• d. second means for affixing said first pilot ring to a first axial face of said coupling flexing element such that the axis of the precision-finished radially symmetric surface is coincident with the coupling axis.

In a sub-assembly for a coupling for transmitting rotary power, said sub-assembly comprisings:

• a. a plurality of flexible laminar elements and
• b. first means for holding said laminar elements in facing relationship, thereby creating a coupling flexing element having a coupling axis and two axial faces, the improvement wherein said sub-assembly further comprises:
• c. a first pilot ring alignment means having at least one precision-finished radially symmetric surface for aligning said coupling flexing element with a first hub and
• d. second means for affixing said first pilot ring to a first axial face of said coupling flexing element such that the axis of the precision-finished radially symmetric surface is coincident with the coupling axis.