Vacuum Cleaner Rear-Weighted Layout for Stable Posture Detection
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Solution Overview
Problem
Vacuum cleaners with a center of gravity located at the rear portion maintain stability and allow for accurate detection of stopping and moving states, enabling automatic travel based on posture and slope detection, regardless of dust amount or weight changes in the dust container.
Innovation Solution
The vacuum cleaner design includes moving wheels on both sides, a wheel motor assembly, a rear-mounted main motor, and a battery positioned behind the rotating center, with a detecting part to monitor inclination and control wheel operation, ensuring the center of gravity is rearward, allowing for stable support and automatic movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the main motor and battery are positioned at the rear of the cleaner body, then the center of gravity shifts backward improving stability, but the device complexity increases due to precise positioning requirements
Solution Approach 1:
The patent applies local quality by concentrating heavy components (main motor and battery) at specific rear positions of the cleaner body. This creates a localized weight distribution that shifts the center of gravity backward to improve stability, while the rest of the body maintains a lighter, simpler structure. The differential weighting strategy resolves the contradiction by achieving stability enhancement without requiring complete redesign of the entire device structure.
Solution Approach 2:
The patent resolves the positioning complexity issue by transitioning from two-dimensional placement to three-dimensional spatial arrangement. The main motor and battery are positioned at vertically staggered locations (main motor above horizontal extension line, battery below it), creating a balanced rear weight distribution that achieves stable center of gravity positioning while simplifying the overall mounting structure through vertical space utilization.
2Measurement precision
If the center of gravity is located at the rear portion, then accurate detection of stopping and moving states is enabled, but the ease of operation decreases due to altered handling characteristics
Solution Approach 1:
The patent applies self-service by enabling the cleaner body to automatically detect and respond to its own motion state changes. The detecting part monitors the inclination angle caused by center of gravity shifts, and the control unit automatically adjusts wheel motor operation accordingly. This self-detection and self-adjustment mechanism improves measurement precision while reducing the operational burden on the user, as the system autonomously compensates for the altered handling characteristics.
Solution Approach 2:
The patent implements feedback control where the detecting part continuously monitors the cleaner body's inclination angle, which changes with motion state. This detection information feeds back to the control unit, which adjusts wheel motor torque to maintain stable operation. The feedback mechanism resolves the contradiction by automatically adapting to the rear-weighted configuration, improving detection accuracy while maintaining ease of operation through automated compensation.
3Ease of operation
If automatic travel control is implemented based on posture detection, then user convenience is enhanced, but the device complexity increases due to additional control systems
Solution Approach 1:
The patent applies universality by designing the detecting part and control unit to serve multiple functions. The same inclination detection system is used both for accurate motion state detection and for automatic travel control. The wheel motors function both as drive units and as actuators for automatic posture adjustment. This multi-functionality approach enhances user convenience through automatic travel while avoiding the need for separate dedicated control systems, thereby limiting the increase in device complexity.
4Stability of the object's composition
If the battery protrudes backward further than the main motor, then the center of gravity shifts more rearward improving stability, but the length of the cleaner body increases
Solution Approach 1:
The patent resolves the length-stability contradiction by utilizing the vertical dimension for component arrangement. The main motor and battery are positioned at different vertical levels (above and below the horizontal extension line) rather than only horizontally. This three-dimensional arrangement allows the battery to protrude backward further than the main motor to shift the center of gravity rearward for stability, while the vertical staggering prevents excessive increase in overall body length by efficiently using available spatial volume.
Data Source
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AI summary
Provided is a vacuum cleaner including a cleaner body; a moving wheel provided at each of both side surfaces of the cleaner body, rotated for travelling of the vacuum cleaner and configured to support the cleaner body to be rotatable in normal and reverse directions; a wheel motor assembly connected to the moving wheel and configured to rotate the moving wheel for the travelling of the vacuum cleaner; a main motor provided inside the cleaner body, located at a rear side further than a vertical extension line of a rotating center of the moving wheel and driven to suction dust; and a battery provided inside the cleaner body, located at the rear side further than the vertical extension line of the rotating center of the moving wheel and configured to provide electric power to the main motor and the wheel motor assembly, wherein a center of gravity of the cleaner body is located at a rear of the vertical extension line of the rotating center of the moving wheel due to an arrangement of the main motor and the battery.