The age of robots we once saw only in cartoons and movies is now becoming reality. Artificial intelligence, autonomous vehicles, drones, and various types of robots have begun making their way into everyday life and industrial settings. Among them, the focus of today’s discussion is the quadruped robot, which is entering real-world applications even faster than humanoid robots. Multi-legged robots have been attracting growing attention from companies and research institutions both at home and abroad. Let’s explore why this animal-inspired form is being chosen among the many types of robots available, and what conditions must be met for quadruped robots to be deployed effectively in real-world environments.
Table of Contents
Robots That Replicate Animal Movement
Key Summary A quadruped robot moves on four legs, much like an animal, and is also widely known as a “robot dog.” Its most notable characteristic is terrain adaptability, and having multiple points of support makes it easier to maintain balance both while stationary and while walking.
A quadruped robot is a robot that moves on four legs, much like an animal. Designed to mimic the movement of animals such as dogs, horses, and cheetahs, they are also widely known as “robot dogs.” This structure gives quadruped robots a distinctive set of advantages.
The most notable characteristic is terrain adaptability. These robots can move stably even in environments that are difficult for conventional automated equipment to navigate, such as rugged mountain terrain, staircases, or piles of debris. Having multiple points of support also makes it easier to maintain balance both while stationary and while walking.
It is these characteristics that have drawn attention to quadruped robots as a complement to the limitations of car-type automated robots.
How Far Can Quadruped Robots Go?
Key Summary Quadruped robots are being evaluated across a wide range of industries, especially environments difficult or dangerous for humans to access — facility monitoring and patrol, disaster zones, defense applications, and last-mile delivery in spaces existing delivery equipment struggles to navigate.
As an emerging next-generation technology, multi-legged robots are being evaluated for potential use across a wide range of industries. They are particularly valued in environments that are difficult or dangerous for humans to access. One representative application is facility monitoring and patrol. These robots can take on the role of monitoring for abnormalities at construction sites, power plants, and large factories where access is hazardous or repeated checks are required.
This role becomes even more critical in extreme environments such as disaster zones or military settings. In situations like building collapses or fires where human entry is difficult, quadruped robots can assist in rescue operations by scouting interiors and identifying the locations of survivors. In the defense sector, research is underway in multiple countries on the concept of robots that can carry supplies or conduct reconnaissance in place of personnel.
There are also applications closer to everyday life. Last-mile delivery is one example, where robots could deliver packages directly to front doors in environments that existing delivery equipment struggles to navigate, such as apartment stairwells or narrow alleyways. In this way, multi-legged robots are expected to play a growing role in improving human work efficiency across a wide range of industrial environments.
Key Performance Requirements for Stable Operation
Key Summary For quadruped robots to operate reliably in the field, durability, high torque output, responsiveness, weight reduction, and thermal management all matter. The component that has the greatest influence on all of these factors is the actuator.
What conditions must be met for quadruped robots to carry out their missions reliably in the field? Given that they are designed to operate in rough terrain, durability is an essential requirement. The robot must be able to move as intended without falling over, even when subjected to external impacts or sudden changes in the environment.
High torque output is also necessary for a robot to support its own weight while climbing stairs or performing jumping motions that require instantaneous bursts of force. Equally important is responsiveness, the ability to instantly adjust direction and power output in response to changing terrain.
From a design perspective, weight reduction and thermal management also matter. As the weight of the legs increases, energy consumption during movement rises accordingly, making a light yet robust structure a key requirement. The design must also account for effectively dissipating the heat generated during operation.
The component that has the greatest influence on all of these factors, including durability, high-torque output, and lightweight construction, is the actuator. Which actuator is installed determines how well these conditions are realized, and ultimately affects the overall quality and capability of the quadruped robot.
A Core Solution for Next-Generation Robot Drive Systems
Key Summary Bonsystems has developed the BCSA V4 robot actuator. It adopts a cycloidal gear mechanism that evenly distributes impact loads, and a pinless gear structure that minimizes the number of components for compactness, reduced weight, and long-term durability, while delivering high torque within a slim profile.
Bonsystems has developed the BCSA V4 robot actuator, keeping pace with the advancing landscape of robotic technology. The V4 series adopts a cycloidal gear mechanism that evenly distributes impact loads during repetitive motion and maintains stable performance over time. In particular, the application of a pinless gear structure minimizes the number of components, achieving both compactness and reduced weight, while lowering the likelihood of wear to support long-term operational stability and durability.
In terms of weight, an aluminum anodized housing has been applied to simultaneously achieve lightweight construction and a robust external structure. The design is also capable of delivering high torque even within a slim profile, improving the efficient use of space inside the robot.
We remain committed to pushing beyond the BCSA V4, with ongoing research and development into even more advanced robotic actuators. If you are interested in exploring the potential applications of our actuators or discussing specific implementation conditions, we invite you to consult with us directly. We are ready to discuss a well-matched configuration for your product and propose solutions that can be applied to actual robot systems. For more details on robot module development or drivetrain design using our actuators, please reach out through the Bonsystems website.
FAQ
Q: What are the advantages of deploying quadruped robots in outdoor field environments?
A: Wheeled automated robots move quickly and efficiently on flat, even surfaces, but actual industrial environments often present very different conditions. In situations where wheels get caught or stall, such as staircases, debris piles, or uneven outdoor terrain, four-legged robots can respond flexibly using their legs.
Q: In what types of environments will multi-legged robots primarily be used?
A: The first areas where adoption is expected are those that are difficult for people to access directly, are hazardous, or require repeated monitoring. In large, complex facilities such as power plants or factories, periodic checks for anomalies are necessary, and having people perform these tasks manually is time- and labor-intensive, so robots can take over this patrol and monitoring role. Their potential role in disaster scenarios is also noteworthy. In situations involving building collapses or fires, it is critical to understand the internal conditions before rescue workers enter, and robots can go in first to confirm survivor locations or detect hazardous elements.
Q: Is there a reason robots are developed by mimicking living organisms?
A: Animals such as dogs, horses, and cheetahs have been optimized over time to move quickly and efficiently across a wide variety of terrain. Their ability to run along uneven mountain paths, squeeze through narrow gaps, and maintain balance under sudden impacts has already been validated through nature. Rather than designing an entirely new mode of locomotion from scratch, referencing already-validated biological structures can be a practical approach. Multi-legged robots are one of the most prominent examples of this.
Q: Why are quadruped robots easier to deploy than bipedal robots?
A: Humanoid robots most closely resemble the human form, giving them the advantage of being able to use human tools and spaces as they are. However, maintaining balance on two legs is technically challenging to implement. Since stability can be affected by even a slight shift in center of gravity, the control technology required to correct this in real time demands a very high level of accuracy. Four-legged robots have four points of support, making them more stable both while standing still and while walking. This structural stability is what makes them well positioned to be deployed in real-world environments first.
Q: What is most important for a quadruped robot to operate stably?
A: For a robot to move reliably over extended periods in real-world conditions, the performance of the actuator, the core component that drives each leg, is a critical factor. Actuators move each of the robot’s joints and serve a function analogous to human muscles. How much force they can generate, how well they can withstand external impacts, and how light and compact they are will determine the overall quality of the robot as a whole.
