A quadruped robot named “Baby Elephant” with parallel legs has been developed. It is about 1 m tall, 1.2 m long and 0.5m wide. It weighs about 130 kg. Driven by a new type of hydraulic actuating system, the Baby Elephant is designed to work as a mechanical carrier. It can carry a payload no less than 50 kg. Operating outdoors using wireless remote control, the robot will be able to traverse uneven terrain applying walking and trotting gaits and can walk up and down 10 degree inclines. The Baby Elephant carries a lithium battery fixed at the belly to supply all the power. This paper describes the structure of the legs and the application of the energy saving mechanisms on the leg. Simulations and experiments are carried out to testify the efficiency of the spring system in terms of energy saving.

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