Agricultural Cab Steering Layout Without a Traditional Wheel
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Solution Overview
Problem
Existing agricultural work vehicles, such as combine harvesters, lack a steering unit, leading to a sense of insecurity due to large windshields and the absence of holding points when leaning forward, compromising driver comfort and safety.
Innovation Solution
Integration of steering elements into armrests, a footrest positioned near the cab floor, a grab handle system, and a stowage device, along with a steer-by-wire system, allowing intuitive and ergonomic control without a traditional steering wheel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional steering wheel is removed to simplify the vehicle structure, then device complexity is reduced, but driver comfort and safety deteriorate due to lack of holding points and ergonomic support
Solution Approach 1:
The steering function is segmented from the traditional centralized steering wheel and distributed to multiple control elements: joysticks on armrests for primary steering, footrest for secondary control, and grab handles for stability. This segmentation allows each element to perform specific steering tasks while maintaining overall vehicle control without requiring a traditional steering wheel
Solution Approach 2:
The armrests serve multiple functions: providing ergonomic support for the driver's arms, housing joysticks for steering control, and offering additional holding surfaces. The footrest similarly provides both foot support and steering control capability, while grab handles offer both structural support and emergency steering input
2Illumination intensity
If a large windshield is installed to improve visibility, then visibility is enhanced, but driver security deteriorates due to lack of physical barriers and holding points
Solution Approach 1:
Grab handles are introduced as intermediary elements between the driver and the environment. These handles provide physical contact points that mediate the driver's interaction with the vehicle interior, offering psychological and physical security without obstructing the large windshield view. The footrest similarly acts as an intermediary providing stable footing
3Ease of operation
If steering elements are integrated into armrests to improve ergonomics, then ease of operation is enhanced, but device complexity increases due to integration requirements
Solution Approach 1:
The armrest structure is merged with steering control elements (joysticks) and support surfaces into a single integrated component. This combining of functions reduces the need for separate mounting structures and control units, as the armrest itself becomes the housing and mounting platform for the joysticks, simplifying the overall integration
Data Source
AI summary
A driver's cab for an agricultural work vehicle. The driver's cab has a driver's seat on which armrests are arranged on both sides, a windshield delimiting the front of the driver's cab and extending substantially between the cab floor and cab roof of the driver's cab, and a steering unit replacement system. The steering unit replacement system comprises: steering elements at least integrated into the armrests positioned on both sides of the driver's seat, at least one footrest associated with the driver's seat at the front in an area close to the floor, at least one grab handle system arranged at the front, and at least one storage device accessible from the driver's seat by a driver in a sitting position.