Tractor Cab Suspension Transverse Link and Roll Bar
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Solution Overview
Problem
Existing tractor cab suspensions face challenges in effectively controlling roll and transverse movement relative to the chassis, particularly in inhibiting transverse loads while allowing vertical movement.
Innovation Solution
A tractor cab suspension system where each corner of the cab is supported by a fluid damper/spring unit connected via a link of fixed length, with a roll bar to control roll, and limiting mechanisms to restrict movement, along with semi-active damping to adjust to operating parameters, ensuring robust construction and controlled movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional fluid damper/spring unit is used at each corner of the cab, then vertical movement of the cab is permitted, but control of transverse movement and roll is insufficient
Solution Approach 1:
The suspension system is segmented into distinct functional components: vertical spring/damper units for vertical movement, transverse links for lateral control, and roll bars for rotational control. Each component addresses a specific movement type, providing comprehensive stability without requiring a completely complex integrated system.
Solution Approach 2:
Transverse links act as intermediary elements connecting the cab to the chassis, mediating between vertical suspension forces and transverse movement control. These links transfer and control lateral forces while allowing the primary vertical suspension function to remain relatively simple.
2Force
If a robust construction is used to inhibit transverse loads, then transverse movement control is improved, but vertical movement may be restricted
Solution Approach 1:
The force control is segmented by direction: vertical springs handle compressive forces, transverse links handle lateral forces, and roll bars handle rotational forces. This segmentation allows each component to be optimized for its specific force type without interfering with other movement types.
Solution Approach 2:
The transverse links are designed with pivot joints that allow dynamic adaptation of their orientation and force transmission characteristics. As the cab moves vertically or rolls, the links automatically adjust their angles, maintaining effective transverse load resistance while accommodating the full range of vertical movement.
3Device complexity
If passive damping is used, then the system is simple, but adaptability to varying operating conditions is limited
Solution Approach 1:
The damping system transitions from static passive damping to dynamic semi-active damping. The damping coefficients are continuously adjusted based on real-time operating conditions such as cab height, vehicle speed, and acceleration, allowing the system to adapt optimally to varying conditions without requiring a completely complex active control system.
Solution Approach 2:
Sensors provide feedback on cab position, velocity, and acceleration to the control system, which then adjusts the damping forces accordingly. This closed-loop feedback enables the damping system to respond adaptively to changing operating conditions while maintaining relatively simple hardware architecture.
4Stability of the object's composition
If multiple components are used to control transverse and roll movement, then cab stability is improved, but the number of components increases
Solution Approach 1:
The transverse links serve multiple functions simultaneously: they connect the cab to the chassis, provide transverse load resistance, allow vertical movement through pivot joints, and contribute to roll control. This multi-functionality reduces the need for separate dedicated components for each function.
Solution Approach 2:
The suspension system merges the functions of vertical suspension, transverse control, and roll stabilization into an integrated architecture where components work together synergistically. The transverse links and roll bars are combined in a way that their interactions provide both transverse and roll control without requiring entirely separate systems.
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 improved control over transverse and roll movements, maintaining cab stability and ride height through passive or semi-active damping, effectively resisting transverse loads while allowing vertical movement.
Implementation Method 1
each corner of the cab being supported by fluid damper/spring unit
Implementation Method 2
The fluid damper of each damper/spring unit may act through a fixed damping orifice to provide passive damping of the cab relative to the chassis
Implementation Method 3
the link...is pivoted at one end on the chassis and at the other end on the cab about axes which extend generally longitudinal relative to the chassis to allow generally vertical movement of the cab relative to the chassis but resist transverse movement
Implementation Method 4
the torsion bar also being pivotally connected with the cab for pivoting about its longitudinal axis so that any tendency of the cab to roll relative to the chassis loads the torsion bar in torsion
Implementation Method 5
fluid is supplied to and exhausted from either side of the piston of each fluid damper via a solenoid operated fluid flow control valve to adjust the height of the cab relative to the chassis
Data Source
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AI summary
A tractor cab suspension for suspending a tractor cab (10) from an associated chassis (11) is provided. Each corner of the cab (10) is supported by fluid damper/spring unit (12, 13). The damper/spring unit (12) at each of the two front corners of the cab is connected with the chassis via a link (14) of a fixed length and which extends generally transverse relative to the chassis (11). The link (14) is pivoted at one end (14b) on the chassis and at the other end (14a) on the cab about axes which extend generally longitudinal relative to the chassis. This connection allows generally vertical movement (X) of the cab relative to the chassis but resists transverse movement of the cab relative to the chassis. A roll bar (41) acting between the cab and chassis is provided to control roll of the cab relative to the chassis.