Stabilizer Bar Clutch Assembly Backlash Reduction
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Solution Overview
Problem
Traditional vehicle suspension systems with stabilizer bars face issues of increased roll instability and reduced traction due to backlash in the clutch assembly, which affects ride quality and handling, especially on uneven terrain.
Innovation Solution
A stabilizer bar assembly with a clutch mechanism that includes a coupling sleeve and rotary lock, which reduces backlash by engaging the lock members to inhibit relative movement, allowing for selective coupling and decoupling of stabilizer bar members to minimize torsional resistance and enhance traction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a relatively stiff stabilizer bar is used to reduce vehicle roll, then vehicle handling and stability are improved, but the stabilizer bar directly connects the vehicle wheels causing cross-talk that adversely affects vehicle ride
Solution Approach 1:
The stabilizer bar system transitions from a static connected state to a dynamic selectively-coupled state. The clutch assembly allows the stabilizer bar members to be rotationally coupled when stability is needed and decoupled when ride quality is prioritized, enabling the system to adapt to different driving conditions and terrain types.
Solution Approach 2:
The stabilizer bar is divided into separate members (first and second stabilizer bar members) that can be independently controlled. The clutch assembly segments the rotational connection between these members, allowing selective engagement and disengagement to prevent cross-talk between wheels while maintaining stability when needed.
2Strength
If the stabilizer bar is made stiffer to improve handling, then roll resistance is increased, but the torsional stiffness inhibits the free travel of the vehicle wheels reducing traction on uneven terrain
Solution Approach 1:
The system dynamically adjusts the torsional stiffness of the stabilizer bar by selectively coupling and decoupling the bar members through the clutch assembly. When high stiffness is needed for handling, the members are coupled; when wheel freedom of movement is needed for traction, the members are decoupled, allowing the bar to rotate independently at each end.
Solution Approach 2:
The effective torsional stiffness parameter of the stabilizer bar is changed by altering the coupling state of the bar members. The clutch assembly enables transition between a high-stiffness coupled state and a low-stiffness decoupled state, allowing the system to optimize between handling and traction requirements based on driving conditions.
3Manufacturing precision
If backlash in the clutch assembly is reduced to improve precision, then the ability of the clutch assembly to engage and disengage is impaired
Solution Approach 1:
A damping element is introduced as an intermediary component between the clutch members to absorb shocks and accommodate manufacturing tolerances. This intermediary element allows the clutch assembly to engage and disengage smoothly without requiring extremely tight tolerances, thereby reducing backlash while maintaining operational reliability.
Solution Approach 2:
The damping element provides beforehand cushioning by absorbing impact loads and compensating for clearance variations before they can cause excessive backlash or engagement problems. This pre-cushioning effect allows the clutch assembly to function reliably with reduced backlash while maintaining the ability to engage and disengage under various loading conditions.
Data Source
AI summary
A stabilizer bar assembly having a pair of bar members and a clutch assembly with a first and second couplers, which are fixedly coupled to the bar members, a coupling sleeve and a rotary lock. The coupling sleeve matingly engages the first coupler. The coupling sleeve is movable along an axis between a first position, in which the coupling sleeve is disengaged from the second coupler to permit relative rotation between the stabilizer bar members about the axis, and a second position in which the coupling sleeve is engaged to the first and second couplers. The rotary lock has lock members that are fixedly coupled to the coupling sleeve and the second coupler. The lock members engage one another when the coupling sleeve is in the second position to inhibit relative movement about the rotational axis between the coupling sleeve and the second coupler.