Locking Differential Assembly with Segmented Dog Mechanism
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Solution Overview
Problem
Existing locking differential assemblies are susceptible to improvements in their locking mechanism, particularly in the engagement and disengagement of side gears with the differential case, which affects their ability to inhibit relative rotation effectively.
Innovation Solution
A locking differential assembly with a differential case and gearset, featuring a locking mechanism with frusto-conically shaped lock apertures and radially extending locking tabs on a second locking dog that engages with first dog teeth to inhibit rotation, allowing for selective locking and unlocking modes through an actuator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking dog is used to engage side gears to the differential case, then the ability to inhibit relative rotation is improved, but the complexity of the locking mechanism increases
Solution Approach 1:
The locking mechanism is segmented into multiple locking dogs (first locking dog with first dog teeth, second locking dog with second dog teeth and locking tabs). This segmentation allows the locking function to be distributed across multiple components, improving reliability through redundancy while managing complexity through modular design.
Solution Approach 2:
The locking tabs on the second locking dog are received within lock apertures in the differential case, creating a nested structure. The second locking dog is positioned such that its locking tabs engage with the case structure, providing a compact arrangement that improves locking effectiveness without proportionally increasing overall mechanism complexity.
2Manufacturing precision
If locking tabs are received in lock apertures with frusto-conical locking surfaces, then engagement precision and torque transmission are improved, but manufacturing precision requirements increase
Solution Approach 1:
The lock apertures incorporate frusto-conical (truncated conical) locking surfaces instead of flat or cylindrical surfaces. This curved geometric form provides self-aligning properties that improve engagement precision and torque transmission capability. The conical shape allows for gradual engagement and better load distribution, though it does require precision machining of the lock apertures.
Data Source
AI summary
A locking differential assembly having a locking dog that is mounted in a differential case in a manner that permits the locking dog to be translated along an axis between a first position, in which the locking dog is disengaged from a side gear in the differential case, and a second position in which the locking dog is engaged to the side gear. The locking dog is coupled to the differential case in a manner that permits an increasing range of rotation of the locking dog relative to the differential case with axial movement of the locking dog toward the second position. An axle assembly with the locking differential assembly and a related method for forming a locking differential assembly are also provided.