Truck Rear Wheel Suspension Layout for Ground-Level Loading
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Solution Overview
Problem
Existing wheel suspension systems for cargo bikes and flatbed trucks face challenges in maintaining stability and efficiency while minimizing width and allowing for easy loading and unloading of heavy payloads without additional aids, due to limited space and legal width restrictions.
Innovation Solution
A wheel suspension system where each rear wheel is mounted on a separate axle projecting outwards, with a combination of shock absorbers and guides attached to the vehicle frame, allowing for independent movement and efficient force distribution, reducing bending moments, and enabling the loading area to be lowered to the ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a narrow wheel suspension system is used to meet width restrictions, then the vehicle can operate on cycle paths and maneuver in limited spaces, but the strength and stability of the wheel suspension are insufficient to handle heavy payloads
Solution Approach 1:
The wheel suspension system is divided into separate functional components: guide rails that constrain movement, shock absorbers that provide damping, and a modular wheel carrier assembly. This segmentation allows each component to be optimized independently, achieving high strength-to-width ratio.
Solution Approach 2:
The patent transitions from traditional lateral suspension expansion to a longitudinal arrangement where the suspension travel occurs primarily in the vertical dimension. The guide rails constrain movement to a narrow lateral envelope while allowing full suspension travel vertically, effectively moving the suspension function to another dimension.
2Stability of the object's composition
If the loading area is positioned high for structural stability, then the vehicle maintains stability, but additional aids such as ramps or lifting equipment are required for loading and unloading
Solution Approach 1:
The loading area height is made dynamically adjustable through the suspension system. The wheel carrier can be positioned at different heights by controlling the shock absorbers, allowing the loading area to be lowered for easy access during loading/unloading operations and raised for stable transport.
Solution Approach 2:
The suspension system serves multiple functions: it provides structural support for vehicle stability, enables height adjustment for easy loading/unloading, and acts as the primary suspension mechanism. This multi-functionality eliminates the need for separate loading aids while maintaining stability.
3Reliability
If traditional suspension systems are used, then the system provides adequate damping and strength, but the width of the vehicle increases beyond legal restrictions
Solution Approach 1:
The guide rails and shock absorbers are merged into an integrated assembly where the guide rails serve both as structural support and as constraints for suspension travel. This merging eliminates redundant components and reduces the lateral width while maintaining damping performance.
Solution Approach 2:
The patent changes the operational parameters of the suspension system by constraining lateral movement through guide rails while allowing full vertical travel. This parameter change enables the same damping performance to be achieved within a narrower width envelope by redirecting the suspension motion to the vertical dimension.
4Ease of operation
If the wheel suspension system is designed to lower the loading area to the ground, then loading and unloading becomes easier, but the structural stability and strength are compromised
Solution Approach 1:
The shock absorbers act as intermediaries between the wheel carrier and the vehicle frame. They provide the necessary structural strength and control forces while allowing the loading area to be lowered close to the ground. The guide rails simultaneously provide lateral constraint to maintain structural integrity during low-position operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides high strength, stability, and damping while minimizing width, allowing for easy loading and unloading without additional aids, and is modular and cost-effective to produce.
Implementation Method 1
supported in front of and behind the rear wheel (4 view direction) by a combination of separate spring-damper systems (10) and separate guides (11)
Data Source
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AI summary
Wheel suspension system (19) for a cargo vehicle with a wheel housing (9), a wheel suspension device (8) for receiving a wheel axle (7), comprising at least two connecting sections (16), at least two guides (11) wherein the guides (11) are connected to the wheel housing (9), at least two spring-damper units (10), at least two piston-cylinder units (12) wherein at least one guide (11), one spring-damper unit (10) and one piston-cylinder unit (12) are located at two opposite ends of the wheel suspension device (8) and are connected to it.In order to ensure, on the one hand, a loading area with the greatest possible clear width for a given vehicle width and, on the other hand, the ability to lower the loading area to the ground, each rear wheel (5) is mounted on a separate axle (7) provided in a wheel suspension device (8) extending in the longitudinal direction of the cargo vehicle and projecting outwards from the loading area, wherein the wheel suspension device (8) is housed in a wheel housing (9) attached to the vehicle frame and is height-adjustable by at least one combination of shock absorber (10) and guide (11) provided in front of and behind the rear wheel (5) - viewed in the direction of travel.