Independent Rear Suspension Dynamic Toe-In Adjustment
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Solution Overview
Problem
Existing rear wheel suspensions have limited dynamic toe-in adjustment capabilities, which affect the vehicle's dynamic response during braking and accelerating, leading to suboptimal handling and stability.
Innovation Solution
An independent rear wheel suspension design featuring a single wheel control arm and wishbone with strategically positioned and designed bearing devices, allowing for dynamic wheel control angle adjustment through flexible and rigid components, enhancing toe-in adjustment and overall vehicle dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional multi-link rear wheel suspension with upper wishbone and lower trapezoidal link is used, then the structural stability is maintained, but the dynamic toe-in adjustment capability is limited
Solution Approach 1:
The suspension system is divided into functionally independent segments: the lower wheel control arm handles primary wheel guidance and support, while the upper wishbone provides additional stability. This segmentation allows each component to be optimized for its specific function, improving dynamic toe-in adjustment without requiring complete redesign of the entire suspension system.
Solution Approach 2:
The patent implements dynamic toe-in adjustment by making the wheel control angle adjustable during vehicle operation. The wheel control arm and wishbone are designed with specific geometric relationships and bearing arrangements that allow the toe-in angle to change dynamically in response to vehicle motion, rather than being fixed throughout operation.
2Speed
If the lower wheel control arm and upper wishbone are designed with flexible bearing devices, then the dynamic response during braking and accelerating is improved, but the manufacturing precision requirements increase
Solution Approach 1:
Different bearing devices are implemented at different locations in the suspension system. The inner bearings and outer bearings have different flexibility characteristics tailored to their specific functional requirements. This local differentiation allows the system to achieve overall dynamic responsiveness while managing manufacturing precision requirements through targeted design at each bearing location.
Solution Approach 2:
The bearing devices are designed with specific flexibility parameters that can be adjusted during design and manufacturing. By carefully selecting bearing stiffness, damping characteristics, and geometric parameters, the system achieves optimal dynamic response while keeping manufacturing precision within practical limits through parameter optimization rather than extreme precision requirements.
3Ease of operation
If the wheel control arm and wishbone are designed to provide dynamic wheel control angle adjustment, then the vehicle handling is improved, but the device complexity increases
Solution Approach 1:
The patent combines the wheel control arm and wishbone into an integrated wheel guidance mechanism where both components work together to provide dynamic toe-in adjustment. Rather than adding separate adjustment mechanisms, the design merges the control functions into the existing structural elements, improving handling while limiting the increase in overall device complexity.
Solution Approach 2:
The lower wheel control arm and upper wishbone are designed to serve multiple functions simultaneously: they provide structural support, guide wheel motion, enable dynamic toe-in adjustment, and contribute to vehicle stability. This multi-functionality reduces the need for additional dedicated components, thereby improving handling without proportionally increasing device complexity.
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 design improves dynamic toe-in adjustment and vehicle response by providing better control and handling characteristics, including increased lateral stiffness, camber stiffness, and wheel caster stiffness, reducing understeer and enhancing cornering stability.
Implementation Method 1
these are at least partially elastically deformable elastomer bearings or rubber-metal sleeve bearings, whereby the type of elastic deformability on the respective bearings can be selected in the sense of the fulfilling purpose
Implementation Method 2
the bearings used here can be of different designs. Preferably, these are at least partially elastically deformable elastomer bearings or rubber-metal sleeve bearings
Data Source
Figure 1~2
Figure 3~4
AI summary
To simplify the construction of conventional independent motor vehicle rear suspensions, the invention proposes an independent rear suspension (1) of a motor vehicle (8, 9) with a wheel guidance device (4), with a wheel hub carrier (5) and with a dynamic wheel steering angle adjustment (10), in which the wheel hub carrier (5) is mounted on the motor vehicle side by means of the wheel guidance device (4), wherein the wheel guidance device (4) has only a single wheel steering arm (6) with a front inner wheel steering arm bearing (13), with a front outer wheel steering arm bearing (14), with a rear inner wheel steering arm bearing (15) and with a rear outer wheel steering arm bearing (16) and a single control arm (7) with an inner control arm bearing (19) and with an outer control arm bearing (20), and the dynamic wheel steering angle adjustment (10) is formed by the single wheel steering arm (6) and the single control arm (7).