Twisted end interference fit flex shaft

An assembly comprising:

• a flexible shaft having at least one end portion;
• and
• a socket for cooperating with the at least one end portion, the at least one end portion has a substantially uniform cross-section defining a non-planar surface which is twisted about a reference axis for rotationally driving a cooperating planar surface in the socket, the flexible shaft having a helically wound core that rotationally biases the at least one end portion in the corresponding socket so that the non-planar surface remains in contact with the cooperating planar surface in the corresponding socket to reduce vibration and noise.

A power seat, comprising:

• a motor having a motor output for displacing a driven member;
• a gear mechanism having a gear mechanism input for transmitting a rotational torque from the motor to the driven member;
• a flexible drive shaft having at least one end portion for connecting to a socket associated with the at least one of the motor output and gear mechanism input, the at least one end portion has a substantially uniform cross-section defining a non-planar surface which is twisted about a reference axis for rotationally driving a cooperating planar surface in the corresponding socket, the flexible shaft having a helically wound core that rotationally biases the at least one end portion in the corresponding socket so that the non-planar surface remains in contact with the cooperating planar surface in the corresponding socket to reduce vibration and noise.