Torque transfer coupling

A coupling comprising:

• a first coupler rotatable about an axis, the first coupler defining first connections circumferentially distributed about the axis;
• a second coupler defining second connections circumferentially distributed about the axis, the second connections radially offset from the first connections relative to the axis;
• and
• segments circumferentially distributed about the axis and extending radially from the first connections to the second connections, a segment of the segments having a first end engaging a first connection of the first connections and a second end engaging a second connection of the second connections, the first end circumferentially offset from the second end,
• a face of the segment abutting against a face of the first coupler when the segment is inserted into the first connection in a first orientation of the segment relative to the first coupler such that a penetration depth of the segment into the first connection in the first orientation is less than the penetration depth in a second orientation opposite the first orientation, the penetration depth being taken in an axial direction relative to the axis.

A coupling comprising:

• a first coupler rotatable about an axis, the first coupler defining first connections circumferentially distributed about the axis;
• a retaining ring secured to the first coupler;
• a second coupler defining second connections circumferentially distributed about the axis, the second connections radially offset from the first connections relative to the axis;
• and
• segments circumferentially distributed about the axis and extending radially from the first connections to the second connections, a segment of the segments having a first end engaging a first connection of the first connections and a second end engaging a second connection of the second connections, the first end circumferentially offset from the second end,
• the segment including a retaining tab protruding from an axial end face of the segment, the retaining ring engaging the retaining tab to bias the retaining tab in a radial direction relative to the axis when the segment is received in the first connection in a first orientation, the retaining tab abutting a face of the first coupler to prevent insertion of the segment in the first connection in a second orientation opposite the first orientation.