Locking Differential Wear Pads for Spring Binding
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Solution Overview
Problem
Internally pre-loaded locking differentials experience wear and binding issues due to the interaction between compression springs and clutch members, leading to potential damage and reduced operational smoothness.
Innovation Solution
The implementation of cylindrical wear pads at the end of compression springs, which are piloted within a bore, allows the springs to be acted upon by only a single clutch member, preventing shear and wedging effects and ensuring intentional contact at the sliding interface, thus reducing wear and binding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If compression springs are used to provide pre-load forces between clutch members, then the necessary slip resistance is achieved to energize the ramping effect, but sliding wear occurs on both the compression spring and clutch members due to relative motion
Solution Approach 1:
A wear pad is introduced as an intermediary component between the compression spring and the clutch member. The wear pad absorbs the sliding wear through its sacrificial material (such as PTFE or other low-friction materials), protecting the compression spring and clutch member from direct contact and wear. This mediator allows the pre-load force to be maintained while significantly reducing wear on critical components.
2Stability of the object's composition
If compression springs are worked between two clutch members, then pre-load is maintained, but binding of spring coils to cavity edges occurs due to relative motion and unintended forces
Solution Approach 1:
The wear pad serves as a mediator that prevents direct interaction between the compression spring and the clutch member cavity edges. By placing the spring against the wear pad rather than directly against the moving clutch member, the spring's path of motion is stabilized and binding to cavity edges is prevented. The wear pad absorbs the lateral forces and prevents the spring coils from binding.
Solution Approach 2:
The function of the spring support surface is segmented into two separate components: the wear pad and the clutch member. This segmentation allows the spring to interact with the stationary wear pad while the clutch member moves independently, preventing the binding issues that occur when the spring must accommodate the full range of motion between two moving parts.
3Ease of operation
If clutch members are allowed to rotate relative to each other during differential rotation, then over-running condition is achieved, but unintended forces increase the propensity of differential damage
Solution Approach 1:
The wear pad acts as a mediator that controls and manages the forces generated during differential rotation. By providing a low-friction, wear-resistant interface, the wear pad allows the clutch member to rotate relative to the housing while minimizing the generation of unintended forces. The wear pad absorbs lateral loads and prevents these forces from being transmitted to the compression spring and other critical differential components.
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 design enhances the operational smoothness and reduces the likelihood of spring breakage and differential damage by controlling the interaction between clutch members and compression springs, providing a more reliable and durable locking differential mechanism.
Implementation Method 1
The interaction can also cause binding of the coils of the compression spring to the edges of the corresponding cavity or pocket. These conditions result in unintended forces acting within the interface that can increase the propensity of the differential being damaged.
Implementation Method 2
At least one biasing member is disposed between the clutch members and at least one wear pad is disposed at the end of the at least one biasing member to preload the at least one biasing member
Data Source
AI summary
A locking differential for a vehicle includes a rotatable housing and a differential mechanism supported in the housing. The differential mechanism includes a pair of clutch members wherein each of the clutch members presents an inwardly directed face. Each face includes a groove disposed in spacing relationship with respect to the other. A cross pin is received in each groove and is operatively connected for rotation with the housing. At least one biasing member is disposed between the clutch members and at least one wear pad is disposed at an end of the at least one biasing member to preload the at least one biasing member and to allow the at least one biasing member to be acted upon by only a single one of the clutch members.