Utility Vehicle Cab Suspension Independent Roll and Vertical Control
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Solution Overview
Problem
Existing utility vehicle cab suspension systems compromise on controlling roll and vertical movements due to their interconnected nature, requiring a trade-off in damping and stiffness across degrees of freedom, which limits their effectiveness in improving driver comfort, especially on rough terrain.
Innovation Solution
A cab suspension system utilizing separate mechanical linkages for rolling and vertical movements, coupled with distinct spring/damper elements to independently control each degree of freedom, allowing for independent adjustment of roll and vertical stiffness and damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If spring/damper elements act upon more than one degree of freedom in existing cab suspension systems, then the system structure is simpler, but the control over roll and vertical oscillations requires compromise and cannot independently optimize each degree of freedom
Solution Approach 1:
The cab suspension system is segmented into separate mechanical linkages: a rolling linkage (comprising a longitudinal shaft) that permits only roll movement, and a vertical linkage (comprising lateral arms in a four-link arrangement) that permits only vertical movement. This segmentation allows independent control of each degree of freedom through dedicated spring/damper elements connected to each linkage, eliminating the compromise required in integrated systems.
2Adaptability or versatility
If existing cab suspension systems use interconnected linkage for both roll and vertical movement, then the device complexity is reduced, but the ability to independently adjust roll and vertical damping is compromised
Solution Approach 1:
Each linkage is equipped with its own dedicated spring/damper element: a first spring/damper element connected to the rolling linkage for controlling roll oscillations, and a second spring/damper element connected to the vertical linkage for controlling vertical oscillations. This local differentiation enables independent adjustment of damping characteristics for each degree of freedom, allowing optimization of roll damping without affecting vertical damping and vice versa.
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 approach enables independent control of roll and vertical movements, enhancing driver comfort by allowing increased roll damping without affecting vertical damping, particularly beneficial for semi-active and active suspension systems operating on rough terrain.
Implementation Method 1
a first spring/damper element connected between the frame and the rolling linkage, and a second spring/damper element connected between the frame and the vertical linkage
Implementation Method 2
The dampers employed in conjunction with such linkage control both the roll and vertical oscillations
Data Source
AI summary
A utility vehicle (10) comprising a cab (12) mounted to a frame (14) by cab suspension means (16) is provided. The cab suspension comprises rolling linkage (20) which permits only circumferential movement of the cab around a generally longitudinal axis (24;44), and vertical linkage (22) which permits only radial movement of the cab relative to said axis (24) or radial movement of the axis (44) relative to the frame. The rolling linkage and vertical linkage are connected in series between the cab and the frame thus allowing independent resolution of rolling movement and vertical movement. The cab suspension means further comprises two spring/dampers (28,38; 58,38) arranged to independently control the stiffness and damping within the two degrees of freedom, namely roll and vertical movement.