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As robots take on a wider range of environments, demand is growing for mobile platforms that can move reliably and adapt to their surroundings. This is why four legged robots, which walk on four legs like animals, are drawing attention across a variety of industrial settings.
Wheeled mobile robots such as AGVs perform efficiently on flat floors, but they run into limits in environments where the ground isn’t consistent, such as stairs or gravel paths. Quadruped robots, by contrast, can adjust their foot placement and stride through the joints in each leg, letting them respond to a wide range of terrain.
Bringing this kind of terrain response to life requires sensor technology that can read the surrounding environment and control technology that can determine a path forward. At the same time, the actuators that convert control commands into actual motion, and that bear the robot’s own weight, need to deliver strong performance as well.
In this article, we’ll look at the industries where four legged robots are most likely to be adopted, and examine the joint and actuator technology that makes stable walking possible.
Where Are Robot Dogs Being Put to Work?
Quadruped robots are mobile robots designed by mimicking the skeletal structure and gait of four-legged animals. They can take on tasks in environments that wheeled robots struggle to access, and support workers by handling repetitive inspection or transport work. Because of these traits, quadruped robots are being considered for industrial settings where mobility and accessibility matter most.
In large logistics warehouses, four legged robots are being considered for patrolling wide work areas and inspecting facilities. While AGVs focus on carrying goods along a set path, robot dogs can carry cameras and sensors to check conditions inside a warehouse or inspect spaces that normally require a person to walk through, such as the area around equipment or between storage zones.
Outdoors, quadruped robots’ mobility becomes even more valuable. In agriculture, they’re already being used to carry harvested crops repeatedly from the field to the road. Conventional transport equipment struggles to move through narrow paths and uneven ground, but quadruped robots use their leg joints to respond to changes in terrain and move steadily. This is reducing the workload on sections that used to require people to carry loads by hand, while improving overall efficiency.
As AI and sensor technology continue to advance, quadruped robots are expected to expand into remote work in environments that are hard for people to reach or too dangerous to enter. For quadruped robots to be adopted across such a wide range of industrial settings, joint drive technology that can deliver stable walking will be essential.
The BCSA V4: A Slim Actuator for Stable Robot Dog Movement
A four legged robot coordinates multiple joints to adjust the position of all four legs. While one leg moves forward, the others support the body, maintaining posture as they respond to the load changes that come from contact with the ground.
The component that actually carries out this motion inside the joint is the robot actuator. Based on control signals, the actuator generates rotational motion and force, and delivers it to the joint so the robot dog can support its body and generate the drive force it needs to move.
Because a four legged robot has to drive several joints at once, an actuator’s size and weight matter just as much as its performance. Since a joint houses a range of components, including the actuator, a larger drive unit can affect the leg structure and overall weight of the robot, which can in turn slow down how quickly the robot shifts posture and how well it moves.
To meet this need, Bonsystems developed the BCSA series, a slim actuator built to fit into tight joint spaces. Based on our proprietary cycloidal reduction technology, the BCSA is designed to deliver the torque a robot needs even with a thin profile.
Because its slim structure reduces the actuator’s thickness and overall size, it opens up more design flexibility inside the joint. With the drive unit taking up less space, there’s more room for sensors, control components, and other surrounding parts, allowing the robot’s overall structure to be arranged more efficiently.
Inside the actuator, we apply a pinless cycloidal structure for reduction. Cycloidal reduction structures are well suited to delivering high torque and durability, but the number of internal parts can make assembly more complex. The BCSA applies pinless technology to a conventional cycloidal structure, removing the roller pins and simplifying the internal components. This keeps torque transmission performance high while reducing part count and simplifying assembly, which improves productivity.
With these advantages in a slim profile, high torque, durability, and productivity, the BCSA V4 is an actuator solution that can be applied to robot dogs and a wide range of other next-generation robots.
Right now, four legged robots are mainly being considered for movement and observation based tasks like transporting goods or security patrols, but going forward, they’re expected to evolve toward handling a broader range of missions by combining purpose-built sensors and work equipment.
Bonsystems develops drive solutions based on slim actuators and cycloidal reduction technology, tailored to the joint structure and application environment of four legged robots. If you’re designing the joint drive unit for a robot dog, or reviewing actuator specifications for your application, please reach out to us through our website.
FAQ
Q. How is a four legged robot different from a wheeled mobile robot?
Quadruped robots move using legs and joints instead of wheels, which lets them adjust their posture and move steadily even in environments with uneven ground, such as stairs, ramps, or unpaved roads. This makes them a promising platform for inspection and transport tasks in settings where conventional mobile robots have struggled to operate.
Q. What industrial settings are quadruped robots most likely to be used in?
Quadruped robots are being considered for tasks such as patrolling large work areas, inspecting facilities, and transport work that’s repetitive or hard to access safely. In particular, they’re expected to expand into hazardous settings like power plants or construction sites, where they can pair with sensors and equipment to gather on-site data.
Q. How do quadruped robots move steadily over uneven terrain?
Quadruped robots use the joints in each leg to adjust foot placement and stride, maintaining posture as they respond to changes in the ground. This requires sensors that can read the surrounding environment and control technology that can determine a path, along with a joint drive unit that can turn those commands into actual movement.
Q. Why do an actuator’s size and weight matter so much in a robot dog’s joint design?
Because a four legged robot moves several joints at the same time, the size and weight of the actuator in each joint can affect the robot’s overall structure. Using a slim actuator makes better use of the limited space inside a joint, which also makes it easier to fit in sensors and control components.
Q. What advantages does the BCSA V4 actuator bring to a quadruped robot’s joint design?
The V4 is built on a slim structure and cycloidal reduction technology, letting it deliver the torque needed even within a tight joint space. It also applies pinless technology to simplify its internal design, which brings advantages in assembly convenience and manufacturing efficiency, both important considerations in repeated production.
References
1. China’s Deep Robotics Deploys Quadruped Robot at Rural Harvest Sites (iRobot News)
