Rotational support for an interdigitated rotor assembly

A turbine section of a turbomachine, the turbine section comprising:

• a turbine, the turbine comprising a first plurality of turbine rotor blades and a second plurality of turbine rotor blades, the first plurality of turbine rotor blades and second plurality of turbine rotor blades alternatingly spaced along the axial direction, at least one turbine blade of the first plurality of turbine blades attached to a first support member assembly and at least one turbine blade of the second plurality of turbine blades attached to a second support member assembly;
• a first rotational support, both the first support member assembly and the second support member assembly attached to the first rotational support;
• a gearbox, both the first support member assembly and the second support member assembly coupled to the gearbox such that the first plurality of turbine rotor blades and second plurality of turbine rotor blades are rotatable with one another through the gearbox;
• and
• a turbine center frame having an inner center frame support member extending axially aft from a forward end of the turbine section to the gearbox,
• wherein the first support member assembly is connected to a spool, and
• wherein the inner center frame support member is disposed between the first rotational support and the spool.

A turbine section of a turbomachine, the turbine section comprising:

• a low pressure turbine, the low pressure turbine comprising a first plurality of turbine rotor blades and a second plurality of turbine rotor blades, the first plurality of turbine rotor blades and second plurality of turbine rotor blades alternatingly spaced along the axial direction, at least one turbine blade of the first plurality of turbine blades attached to a first support member assembly and at least one turbine blade of the second plurality of turbine blades attached to a second support member assembly;
• a ball bearing, each of the first support member assembly and the second support member assembly attached to the ball bearing;
• a gearbox, each of the first support member assembly and the second support member assembly coupled to the gearbox such that the first plurality of turbine rotor blades and second plurality of turbine rotor blades are rotatable with one another through the gearbox;
• and
• a turbine center frame having an inner center frame support member extending axially from a forward end of the turbine section aft to the gearbox,
• wherein the first plurality of turbine rotor blades are configured to rotate in a first circumferential direction and the second plurality of turbine rotor blades are configured to rotate in a second circumferential direction, the second circumferential direction opposite the first circumferential direction,
• wherein the first support member assembly is connected to a low speed spool, the low speed spool drivingly connected to a low pressure compressor disposed forward of the turbine section, and
• wherein the inner center frame support member is disposed between the ball bearing and the low speed spool.