The first commercial robot (* 1) to overcome this situation is the "Spot" from Boston Dynamics in the United States. By walking like a dog with four legs, you can go to almost any place where people can walk, such as construction sites where construction materials are scattered, stairs, mountain roads, sandboxes, etc. In addition, it is possible to carry luggage up to 14 kg.

With Boston Dynamics showing that a four-legged walking robot can be realized as a commercial product, this area, which can be said to be a blank area for robot utilization, is heating up at once. China Unitree Robotics has already launched a four-legged walking robot on the market, and smartphone giant Xiaomi China has also started offering four-legged walking robots for developers. It can be said that there is a high possibility that entry will occur one after another in the future.

What kind of mechanism is used to realize this complicated four-legged walking? What kind of sensors, motors and reducers do you need? How do you ensure weight reduction and rigidity? Where are the points to be improved in Spot? This book clarifies these questions from the decomposition. Since the distribution volume of Spot is small and there are no disassembled books yet, it is a valuable book unlike any other in the world (* 1).

* 1) According to Nikkei Cross-Tech research (as of August 31, 2021)