Electric Steering Axle for Compact Sweeper Maneuverability
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Solution Overview
Problem
Existing self-propelled sweepers are large and difficult to maneuver in narrow areas due to their size and hydraulic steering systems, which are cumbersome and require frequent maintenance.
Innovation Solution
A compact self-propelled sweeper design with electric steering and traction, featuring a frame with a box-shaped structure, oscillating rear axle, and individual traction motors, along with an electric steering control system using microprocessors and sensors for precise control and reduced maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hydraulic steering apparatuses are used in power-operated machines, then steering function is achieved, but the drivers cabin becomes uncomfortable due to oil leaks and high heat released
Solution Approach 1:
The patent replaces the hydraulic steering system with an electric steering system. The electric steering actuator uses an electric motor instead of hydraulic components, eliminating oil leaks and heat generation from hydraulic fluid. This substitution maintains the steering function while removing the harmful effects associated with hydraulic systems.
2Adaptability or versatility
If a central pivot is used to allow the sweeper to go around corners, then steering capability is improved, but the space in the machine cannot be fully exploited and the machine is not very versatile
Solution Approach 1:
The patent resolves the space conflict by moving the steering pivot point vertically - the front axle is positioned at a higher level than the maximum wheel height. This allows the inner wheel to rotate beyond the right-angle position during cornering, achieving enhanced steering capability without compromising horizontal space utilization for the refuse container and other components.
3Adaptability or versatility
If the upper arms of the suspension are arranged at a higher level than the maximum height of the wheel, then the inner wheel can rotate beyond the right-angle when cornering, but the structure becomes more complex
Solution Approach 1:
The upper suspension arms serve multiple functions: they support the front axle, enable the wheel to rotate beyond right-angle for improved cornering capability, and provide structural support for the electric steering actuator. This multi-functionality reduces overall system complexity despite the elevated arm positioning.
4Productivity
If large self-propelled sweepers are used, then cleaning capacity is improved, but it is difficult to use them in narrow areas
Solution Approach 1:
The patent segments the machine into compact modular components arranged efficiently around the central frame. The refuse container, electric motors, and steering mechanism are positioned to minimize the machine's footprint while maintaining adequate cleaning capacity, enabling operation in narrow areas.
Data Source
AI summary
The self-propelled sweeper with electrical steering comprises a frame suitable for receiving the refuse container (13), waste collection and suction members (2; 4, 6), a suction and filtering unit, a driving position in the cabin (16) of the machine equipped with steer control members, and has the steer actuator of these members consisting of an electric motor (22). The sweeper also has the front steering axle (5) supported by arms of the suspension (20, 21) of which the upper ones (21) are arranged at a higher level than the maximum height of the wheel (18) of the same axle, the steer linkages (24, 25, 28) are also arranged at said upper-level; in the same way the lower arms (20) are shaped to receive said inner wheel in the position of maximum curvature; moreover, said container (13) is housed on a U-shaped plan rear axle (9).