Vehicle Steering Mechanism with Telescopic Units and Differential
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Solution Overview
Problem
Current vehicle steering mechanisms, such as those using Ackermann geometry, impose kinematic limits on angular deviation and restrict vehicles to narrow turning radii, preventing rotation around non-steering axles or the vehicle center, and do not allow opposing rotations on driving wheels of the same axle.
Innovation Solution
The vehicle incorporates a differential system with selective engagement and blocking means, along with independent telescopic steering units, allowing for opposing rotations of driving wheels and enabling steering around the vehicle's center, and the use of independent telescopic units to modify wheel-holder group angles beyond traditional steering geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Ackermann steering geometry is used, then the vehicle can achieve stable steering, but the angular deviation of the wheel-holder support is limited within a narrow angular range
Solution Approach 1:
The steering system is divided into two independent parts: the main steering cylinder with stem for conventional Ackermann steering, and separate telescopic units (first and second telescopic units) for additional angular adjustment. This segmentation allows each component to perform its specific function without interfering with the other, enabling both stable conventional steering and extended angular deviation.
Solution Approach 2:
The telescopic units are designed to be movable relative to the wheel-holder support, allowing dynamic adjustment of the steering angle beyond the fixed limits of Ackermann geometry. The telescopic units can extend and retract to provide additional angular deviation as needed, making the steering system adaptable to various maneuvering requirements.
2Ease of operation
If a rigid rod element is integrally hinged to the wheel-holder supports, then the wheels can be steered in the same direction, but rotation around a center inside the ground-support quadrilateral is not possible
Solution Approach 1:
The steering control is segmented into the main steering stem for basic directional control and independent telescopic units for advanced maneuvering. The telescopic units can operate independently to enable the wheel-holder support to rotate around different centers, including centers inside the ground-support quadrilateral, while the main stem maintains basic steering control.
Solution Approach 2:
The telescopic units act as intermediaries between the main steering stem and the wheel-holder support. They transmit and modify the steering motion, enabling the wheel-holder support to achieve rotations around various centers by extending or retracting, thus mediating between the conventional steering input and the advanced maneuvering output.
3Ease of operation
If the steering mechanism follows Ackermann geometry, then the steering wheels can be rotated from a straight advance position, but opposing rotations on driving wheels of the same axle are not possible
Solution Approach 1:
The telescopic units are designed to be independently controllable and can move in opposite directions to enable opposing rotations of the driving wheels. While the main steering stem provides conventional steering rotation, the telescopic units can extend one side while retracting the other, allowing the vehicle to perform opposing wheel rotations for enhanced maneuverability in confined spaces.
4Device complexity
If the translatory movement of the steering stem is limited, then the steering mechanism remains simple, but the angular deviation of the wheel-holder group around the kingpin is limited
Solution Approach 1:
The steering system is segmented into the simple main steering stem with limited translatory movement and the additional telescopic units that provide extended angular deviation. This segmentation maintains the simplicity of the core steering mechanism while adding the capability for wider steering angles through the telescopic units.
Solution Approach 2:
The telescopic units add a new dimension to the steering system by providing axial extension and retraction in addition to the lateral movement of the steering stem. This dimensional addition enables the wheel-holder support to achieve greater angular deviation without complicating the fundamental steering mechanism.
Data Source
AI summary
A vehicle comprises a chassis, a pair of driving wheels, a pair of idle wheels, at least one steering group, and a differential. The steering group is capable of positioning one of the pairs of wheels in a steering geometry where an axis of each of the wheels of the pair of wheels capable of being positioned by the steering group intersects with the remaining axis within a ground-support quadrilateral formed by the pairs of wheels. The differential comprises an outer case, an inner case, a selective engagement, a selective blocking means, and a selective direct gearing means. When the inner case is coupled to the outer case a first half-shaft and a second half-shaft are driven similarly and when the inner case is coupled to the chassis and one of the half-shafts is drivingly engaged with a crown gear the first half-shaft and the second half-shaft are driven opposingly.