Compound Steering Mechanism for Tractor Axle Maneuverability
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Solution Overview
Problem
Conventional steering systems in agricultural vehicles with large steerable wheels face limitations in maneuverability due to a small radius of turn, which restricts movement in tight spaces and increases the area flattened during turns, especially with larger tractor sizes and implements.
Innovation Solution
A front axle mounting assembly with a steerable axle that uses a pair of support arms and a crosslink member to increase the effective pivot radius, allowing greater sideways movement and integration of axle sluing means to enhance angular and transverse displacement, facilitated by a dual-acting hydraulic ram or struts for steering and sideways motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional steering systems with single support arm are used, then device complexity is reduced, but the radius of turn is too large and maneuverability is limited
Solution Approach 1:
The steering mechanism is segmented into multiple independent components: a first support arm pivotally connected to the chassis, a second support arm pivotally connected to the first support arm, and a steerable axle connected to the second support arm. This segmentation allows each component to move independently, enabling the axle to achieve both angular displacement and transverse displacement, thereby reducing the turning radius and improving maneuverability while maintaining manageable complexity through modular design
Solution Approach 2:
The invention adds another dimension of movement by introducing the second support arm that provides transverse displacement in addition to the angular displacement provided by the first support arm. This dimensional change transforms the steering motion from a single-plane rotation to a compound motion involving both rotation and lateral movement, significantly reducing the effective turning radius
2Length of moving object
If larger steerable wheels are used on conventional steering systems, then the tractor size increases, but the turning radius becomes even larger and the wheels may catch on the engine compartment
Solution Approach 1:
The compound support arm mechanism introduces transverse displacement as an additional degree of freedom, allowing the axle and wheels to move laterally relative to the chassis in addition to rotating. This dimensional change enables larger wheels to turn without their inner edges catching on the engine compartment or frame, as the entire axle assembly shifts sideways during the turning motion
Solution Approach 2:
The system transitions from a static, fixed-geometry steering arrangement to a dynamic system where the support arms can pivot and adjust the axle position. This dynamic capability allows the wheel path to be optimized during turning, preventing the wheels from contacting the engine compartment while accommodating larger wheel sizes
3Device complexity
If the axle pivot radius is small, then the steering mechanism is simpler, but the maximum pivot angle is inhibited and the inner wheel comes closer to the vehicle frame
Solution Approach 1:
The pivot mechanism is segmented into two sequential pivot points: the first support arm pivots relative to the chassis, and the second support arm pivots relative to the first support arm. This segmentation of the pivoting function allows the system to achieve a larger effective pivot angle and greater transverse displacement without requiring an overly complex single-point pivot mechanism
Solution Approach 2:
The compound support arm mechanism provides more transverse displacement and pivot angle than a simple single-arm system, achieving excessive action in terms of movement range. This partial over-engineering of the displacement capability ensures that the inner wheel maintains sufficient clearance from the vehicle frame even at maximum steering angles
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 design significantly increases the maximum pivot angle and distance between the inner wheel and the vehicle frame, enabling larger wheels and reduced turning radius, improving maneuverability and minimizing area flattening during turns.
Implementation Method 1
The rear part of the axle 20 is connected to the support through a further ball-and-socket joint allowing the axle to pivot in an arc about this joint
Implementation Method 2
a dual-acting hydraulic ram or struts for steering and sideways motion
Data Source
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AI summary
In summary, there is provided a front axle mounting assembly (100) which is suitable for a tractor or a construction vehicle for example. The assembly comprises a steerable front axle (130), which is typically the front axle on a tractor, and a pair of support arms (120) which extend forwardly from the main body of the vehicle. The arms are pivotally mounted to the body of the vehicle, for example, at the front of the chassis, at transversely spaced mounting points (121). The other ends of the arms (120) are pivotally attached to, and maintained at a fixed spacing, by a crosslink member (124). The axle (130) is mounted to the crosslink member (124) so as to be parallel thereto when viewed from above. By mounting the axle (130) on two support arms (120) instead of one, the effective radius of pivot of the axle is significantly increased, thereby allowing the axle to move sideways to a greater extent for a given angular displacement.