A swashplate hydraulic steering gear, also known as a swashplate hydraulic rudder system, is a device used in marine and aerospace applications to control the steering of a ship or aircraft. The system uses a hydraulic cylinder with an oscillating (swashplate) motion to control the angle of the rudder. The swashplate design enables smooth, efficient motion and provides high torque output, making it ideal for large vessels that require precise and powerful steering. Its compact structure and efficient hydraulic power transmission ensure reliable performance under a variety of operating conditions.