Quadruped robots jump poorly because their motors cannot deliver enough peak power for explosive leaps. The standard solution is bigger motors or geared transmissions — more power at the actuator. Chen, Liu, Zhou, Wang, Bu, Sun, and Cheng go the other direction: leave the motors the same, add compliance.
Their leg mechanism uses a 3D-printed elastic lattice in PEBA material that functions like a biological tendon. During the squat phase, the elastic structure stores energy as the robot crouches. During the leap, the stored energy releases simultaneously with the motor output, augmenting peak power without changing the motor. The result: 17.1% improvement in vertical jumping height from the same actuators.
The design draws from froghopper biomechanics, where tiny insects achieve extraordinary launch accelerations by pre-loading elastic resilin pads and releasing them with a latch mechanism. The robot's lattice structure serves the same function — a temporal energy buffer that accumulates power over a long squat and releases it in a short burst.
The through-claim is about what limits explosive performance. The bottleneck in robotic jumping is not energy — the battery has plenty. It is power: the rate of energy delivery. Motors are power-limited, not energy-limited. The elastic element changes nothing about the total energy budget. It changes the temporal distribution — spreading the energy input over a long phase and concentrating the output into a short one. The same motor, the same energy, a different time profile. Peak performance is a scheduling problem, not a capacity problem.