Agricultural Machine Cab Chassis Gap Energy Absorber
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Solution Overview
Problem
Agricultural working machines face a high risk of tipping over on sloping or uneven ground, leading to increased stress and deformation of the driver's cab, which is exacerbated by the use of heavier machines to cover larger areas efficiently, making it challenging to ensure the cab's dimensional stability and safety.
Innovation Solution
The design incorporates a component that absorbs deformation energy, such as a crash box, which is compressible and strategically positioned between the driver's cab and chassis, allowing it to yield under external loads and reduce bending stresses during a tip-over, while being shielded from normal driving impacts by a spring mechanism that only activates under significant loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heavier machines are used to cover larger areas efficiently, then productivity increases, but the forces to which the driver's cab is exposed during tipping increase, worsening dimensional stability and safety
Solution Approach 1:
A deformation energy absorbing component (crash box) is introduced as an intermediary element between the driver's cab and the chassis. This component absorbs deformation energy during tipping events, reducing the forces transmitted to the driver's cab while allowing the machine to maintain its heavy weight for productivity purposes.
Solution Approach 2:
The deformation energy absorbing component is pre-installed between the driver's cab and chassis to provide cushioning protection before a tipping accident occurs. This component is designed to compress and absorb energy during the impact, protecting the driver's cab from direct exposure to full impact forces.
2Strength
If a deformation energy absorbing component is added between the driver's cab and chassis, then driver's cab protection improves, but device complexity increases
Solution Approach 1:
The machine structure is segmented into distinct functional zones: the driver's cab, the deformation energy absorbing component, and the chassis. This segmentation allows the deformation energy absorbing component to be designed and positioned independently to optimize its protective function without redesigning the entire machine structure.
Solution Approach 2:
The deformation energy absorbing component serves as a mediator element that connects the driver's cab and chassis while providing protective function. This intermediary approach adds only the necessary protective element rather than redesigning the entire connection system.
3Reliability
If the deformation energy absorbing component is always in contact with the driver's cab, then protection is continuous, but material fatigue occurs during normal driving due to constant loading
Solution Approach 1:
The connection between the deformation energy absorbing component and the chassis is made movable rather than fixed. A movable connection allows the component to be loaded only during tipping events when relative movement occurs, while during normal driving the component remains unloaded, preventing material fatigue.
Solution Approach 2:
The deformation energy absorbing component automatically engages only when needed - during tipping events when the driver's cab moves relative to the chassis. During normal operation, the component remains disengaged and unloaded, serving itself by activating only under the specific condition of an accident.
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
This solution effectively reduces the deformation of the driver's cab during accidents, minimizing the risk of injury and material fatigue, while maintaining the cab's structural integrity and preventing unnecessary loading during normal operation.
Implementation Method 1
at least one component absorbing deformation energy, said component being arranged in the gap and being compressible by movement of the body parts from the rest position to the loading position
Implementation Method 2
said component being compressible by movement of the body parts from the rest position to the loading position
Implementation Method 3
shielded from normal driving impacts by a spring mechanism that only activates under significant loads
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
In an agricultural machine, a chassis (1) forms a first body part (1), and a driver's cab (4) forms a second body part (4) arranged above the first body part (1). A gap (19) is provided between the body parts (1, 4). The body parts (1, 4) are movably connected to each other between a rest position and a loaded position, in which the gap (19) is narrower than in the rest position. At least one component (22) that absorbs deformation energy is arranged in the gap (19) and can be compressed by a movement of the body parts (1, 4) from the rest position to the loaded position.