The pericyclic variable rotor speed drive transmissiion (PVT) is a promising alternative to gear-type main transmission systems. It holds great promise in providing advanced technology features to benefit twenty-first- century rotorcraft drive system upgrades as well as the future Joint Transport Rotorcraft (JTR). As previously mentioned, these upgrades and the JTR have all been identified on DoD technology road maps. Unique PVT basic architecture features such as its pericyclic kinematic/kinetic design will permit more load- transmitting components to simultaneously share the transmitted torque under pure rolling contact, thereby facilitating a major improvement in power density not previously possible with gear-type transmission systems. Additionally, the pericyclic design feature permits customized rotor speeds not possible or practical with gear-type transmission systems. The overall basic PVT architecture can permit extensive oil-off operation (several hours) using tribological film transfer among its pure rolling torque transfer members. Geartype systems require auxiliary oil supply reservoirs resulting in a weight penalty and lower reliability. The PVT is the first serious innovative, high- efficiency, variable power transmission system to come along as an alternative to conventional gear-type transmission systems.


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