Coupled Torsion Beam Axle Suspension Toe Control
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Solution Overview
Problem
Conventional coupled torsion beam axle type suspension systems face issues with turning stability due to toe angle changes in rear wheels during vehicle turns, leading to over-steering and decreased impact and roll characteristics, as well as NVH performance and durability.
Innovation Solution
The system incorporates a link bracket with a pocket portion, a horizontal portion, and a vertical portion, featuring upper and lower mounting bushes offset in predetermined directions to position the instantaneous rotational center behind the wheel centers, enhancing toe control and connecting strengths in series and parallel to improve impact and roll characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the instantaneous rotational center point is positioned in front of the wheel centers in a conventional CTBA, then the structure is simpler, but the rear outer wheel tends to toe-out and the rear inner wheel tends to toe-in during turns, causing over-steering and deterioration of turning stability
Solution Approach 1:
The patent positions the instantaneous rotational center point behind the wheel centers by adjusting the spatial arrangement of the lower and upper mounting bushes in the link bracket. This dimensional repositioning in the vertical and horizontal planes changes the geometric relationship between the rotational center and wheel centers, thereby altering the toe angle characteristics during turns to achieve under-steering and improve turning stability
2Stability of the object's composition
If the instantaneous rotational center point is positioned behind the wheel centers by adding a link bracket with upper and lower mounting bushes, then turning stability is improved through under-steering, but the device complexity increases
Solution Approach 1:
The link bracket is segmented into distinct functional portions: a pocket portion for engaging the trailing arm bush, a horizontal portion for mounting the lower mounting bush, and a vertical portion for mounting the upper mounting bush. This segmentation allows each portion to perform its specific function efficiently while maintaining overall structural coherence, thereby managing complexity through functional decomposition
3Device complexity
If the trailing arm bush is used as the sole vehicle body-engaging unit, then the structure is simpler, but the impact characteristics against thrust and drag forces as well as NVH performance and durability are decreased
Solution Approach 1:
The link bracket merges multiple functions into a single component: it engages the trailing arm bush through the pocket portion, provides mounting points for both lower and upper mounting bushes to connect with the vehicle body, and positions the instantaneous rotational center behind the wheel centers. This merging of functions into one integrated component improves impact characteristics and durability while managing structural complexity
Data Source
AI summary
A coupled torsion beam axle type suspension system may include trailing arms respectively coupled to opposite ends of a torsion beam, a trailing arm bush coupled to a front end portion of the trailing arm, a link bracket mounted in front of the trailing arm bush and engaged therewith in a width direction of a vehicle, and a lower mounting bush mounted outside of the trailing arm bush in front thereof, installed in the link bracket, and engaged with a lower part of the vehicle body in a height direction of the vehicle, and an upper mounting bush offset, with respect to the lower mounting bush, by a predetermined width in the width direction of the vehicle, a predetermined height in a height direction thereof, and a predetermined length in a length direction of the vehicle body.