McPherson Strut Coupling Geometry for Wheel Suspension
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Solution Overview
Problem
Conventional wheel suspensions experience reduced driving comfort due to stick-slip effects and unwanted bearing migration in the McPherson strut unit during wheel deflection and rebound, leading to inefficient spring response and damping.
Innovation Solution
The front lower transverse arm is positioned such that the McPherson strut unit's coupling point runs parallel to its longitudinal axis during wheel deflection, preventing rubber-metal sleeve bearing compression, and the rear lower transverse arm is tilted approximately 45°, with body-side bearing points aligned horizontally to avoid unwanted migration, enhancing the structural arrangement and damping properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the McPherson strut unit is tilted to match the wheel-guiding transverse arms, then structural arrangement is improved, but squeezing of the lower rubber-metal sleeve bearing occurs during wheel deflection
Solution Approach 1:
The patent changes the geometric parameters of the transverse arm arrangement, specifically positioning the front lower transverse arm such that the coupling point runs parallel to the longitudinal axis of the McPherson strut unit during wheel deflection. This parameter adjustment eliminates the squeezing effect on the rubber-metal sleeve bearing while maintaining the necessary structural arrangement for matching the transverse arms to the strut unit.
2Adaptability or versatility
If the coupling point of the McPherson strut unit migrates during spring path, then adaptation to wheel movement is improved, but stick-slip effects occur on the telescoping shock absorber
Solution Approach 1:
Instead of allowing the coupling point to migrate freely during spring path, the patent inverts the approach by designing the transverse arm arrangement so that the coupling point maintains a consistent parallel relationship with the longitudinal axis of the McPherson strut unit. This inverted constraint eliminates stick-slip effects on the telescoping shock absorber while still providing necessary adaptation to wheel movement through the parallel geometry.
3Adaptability or versatility
If the lower bearing point of the McPherson strut unit migrates over the spring path, then wheel guidance flexibility is improved, but driving comfort is reduced
Solution Approach 1:
The patent changes the positional parameters of the transverse arms, specifically aligning the body-side bearing points horizontally at the same height and positioning the front lower transverse arm with the coupling point running parallel to the strut unit axis. This parameter optimization prevents unwanted migration of the lower bearing point throughout the spring path, thereby improving driving comfort while maintaining adequate wheel guidance flexibility.
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 configuration improves driving comfort and damping properties by eliminating stick-slip effects and ensuring consistent spring response without compromising guiding properties, resulting in better overall vehicle performance.
Implementation Method 1
a rubber-metal sleeve bearing which couples the lower end of the strut unit to the forward lower transverse arm
Implementation Method 2
a telescoping shock absorber
Implementation Method 3
damping of the motor vehicle
Data Source
AI summary
The invention relates to a wheel suspension for motor vehicles, with at least one upper transverse arm and two lower separated transverse arms per wheel, which are each arranged at a defined angle to one another and are articulated to the body of the vehicle and also to a wheel carrier, furthermore with a track rod which acts on the steering lever of the wheel carrier and with a McPherson strut unit which, aligned at a defined angle to the vertical, is coupled to the body of the vehicle and to the forward lower transverse arm via a rubber-metal sleeve bearing. To achieve improved driving comfort of the motor vehicle it is suggested that at least the forward lower transverse arm (12) is arranged such that the coupling point (12c) of the McPherson strut unit (20) on the transverse arm (12) when the wheel is deflected viewed in the transverse direction of the vehicle (30) runs parallel to the longitudinal axis (28) of the McPherson strut unit (20).