Differential Preload Adjustment for Torque Consistency
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Solution Overview
Problem
Limited slip differential assemblies lack adjustable frictional engagement, which can result in inconsistent torque distribution between driven wheels, affected by manufacturing variances and varying coefficients of friction.
Innovation Solution
Incorporation of an adjustable coupling mechanism with a biasing member, such as a compression spring, that allows for variable preload force adjustment between the side gears and the differential housing, enabling independent adjustment of coupling assemblies to optimize torque distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring applies a predetermined engagement force to provide frictional engagement between the side gear and differential housing, then limited slip differential function is achieved, but the engagement force is not adjustable leading to inconsistent torque distribution
Solution Approach 1:
The patent transforms the static spring engagement force into a dynamic, adjustable system by introducing an adjustment member that modifies the spring's preload. This allows the engagement force to be dynamically tuned to compensate for manufacturing variances and achieve consistent torque distribution, directly resolving the contradiction between reliability and adaptability.
Solution Approach 2:
The adjustment member changes the physical parameter of spring preload force by varying the initial compression of the biasing member. This parameter adjustment enables the frictional engagement force to be optimized for consistent torque distribution while maintaining the limited slip differential function, addressing both the reliability and adaptability requirements.
2Productivity
If manufacturing variances are present in differential assembly components, then production efficiency is improved, but frictional engagement becomes inconsistent affecting torque distribution
Solution Approach 1:
The adjustment member provides a post-manufacturing parameter tuning capability that compensates for dimensional variances in assembled components. By adjusting the spring preload, the system achieves consistent frictional engagement despite manufacturing tolerances, resolving the contradiction between production efficiency and engagement consistency.
Solution Approach 2:
The adjustment mechanism allows field adjustment and tuning without requiring precision manufacturing of every component. The system self-corrects for manufacturing variances through adjustable preload, enabling both high production efficiency and consistent frictional engagement.
3Reliability
If a biasing member provides frictional engagement between output assemblies and housing, then torque distribution is achieved, but the preload force cannot be independently adjusted for each coupling assembly
Solution Approach 1:
The patent divides the differential assembly into independent coupling assemblies, each with its own adjustment member. This segmentation allows independent adjustment of each side's engagement force, enabling precise control over torque distribution and improving both reliability and ease of operation through individualized tuning.
Solution Approach 2:
Each coupling assembly becomes a dynamically adjustable unit with its own preload control. The adjustment members enable independent modification of engagement forces on each side, providing operational flexibility and ensuring consistent torque delivery through balanced or asymmetric adjustment as needed.
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
Enables flexible and precise control of frictional engagement, accommodating manufacturing variances and ensuring consistent torque delivery to both wheels, thereby improving the vehicle's traction and reducing resistance to relative rotation.
Implementation Method 1
The frictional engagement may be provided by a spring applying a predetermined engagement force
Data Source
AI summary
A vehicle differential assembly may include a differential housing rotatable about an axis, a first output assembly, a pinion gear, and a first coupling assembly. The first output assembly may include a first side gear and a first output member. The first side gear may be disposed within the differential housing and may be rotatable about the axis. The first output member may be coupled to the first side gear for rotation therewith. The first coupling assembly may be engaged with the first output assembly and may include a coupling mechanism and a biasing member. The coupling mechanism may extend through an opening in the first output member and may be displaceable relative to the differential housing in a direction generally parallel to the axis. The biasing member may be engaged with the coupling mechanism and may urge the first output assembly into frictional engagement with the differential housing.