Double-Wishbone Chassis Geometry for Brake Dive Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor vehicle chassis designs do not adequately support driving comfort, particularly in terms of brake dive and pitching forces, due to the alignment of control arms in conventional double-wishbone suspensions.
Innovation Solution
The double-wishbone suspension is configured with control arms having axes of rotation that are parallel and inclined forward, forming a double connection with the vehicle body, allowing for better absorption of transversal and longitudinal forces, and incorporating pivot bearings for robust pivoting motions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control arms are configured with parallel and inclined axes of rotation in the double-wishbone suspension, then driving comfort and stability are improved through better support of brake dive and pitching forces, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies parameter changes by modifying the orientation and inclination angles of the control arm axes of rotation. The upper and lower control arms are configured with specific inclination angles relative to the horizontal plane, creating a parallel but inclined axis arrangement that optimizes force absorption characteristics while maintaining structural integrity
Solution Approach 2:
The patent employs asymmetry in the control arm configuration where the upper and lower control arms have different lengths, different inclination angles, and different positions relative to the wheel carrier. This asymmetric design allows optimized support for both brake dive and pitching forces while achieving the desired parallel axis relationship
2Stability of the object's composition
If the control arms are configured with parallel and inclined axes of rotation to support brake dive and pitching forces, then stability and steering return are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges for the control arm inclination angles and axis orientations. By defining specific angular parameters and their relationships (parallel inclination), the design achieves stable force absorption characteristics while providing clear manufacturing targets that balance precision requirements with manufacturability
3Force
If the double-wishbone suspension uses two independent wheel suspensions with double connection control arms, then transversal loads and longitudinal forces are absorbed effectively, but the device complexity and weight increase
Solution Approach 1:
The patent merges the functions of multiple control arms into an integrated double-wishbone suspension system where upper and lower control arms work together as a unified kinematic chain. The control arms are connected to the wheel carrier and vehicle body in a combined configuration that simultaneously handles both transversal loads and longitudinal forces through their parallel inclined axes
Solution Approach 2:
The control arms in the patent are designed with multi-functionality, serving simultaneously as structural support elements, force transmission paths, and kinematic guidance mechanisms. The parallel inclined axis configuration enables the same control arm structure to effectively absorb both brake dive forces and pitching forces across different loading conditions
Data Source
AI summary
A chassis of a utility motor vehicle has a double wishbone suspension having two independent wheel suspensions, each wheel suspensions has an upper control arm, a lower control arm, and a wheel carrier. The upper control arm is connected to two upper connection points on the vehicle body which define a first axis, the upper control arm being rotatable relative to the vehicle body about the first axis, and the lower control arm being connected to two lower connection points on the vehicle body which define a second axis, the lower control arm being rotatable with respect to the vehicle body about the second axis. The first and second axes are parallel to one another and inclined relative to a horizontal by an inclination angle that is greater than 0° in a forward direction of travel when the double wishbone suspension is installed in the utility motor vehicle.