Differential Carrier Assembly Without Snap Ring Retention
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Solution Overview
Problem
The existing axle assembly differential systems incur increased manufacturing costs and complexity due to the use of snap rings, which also introduce a weak point and require additional maintenance, affecting customer satisfaction.
Innovation Solution
A system where a planet carrier is coupled to a differential carrier, with planet shafts featuring a cutout interfacing with a pilot interface of the differential carrier, eliminating the need for a snap ring to fixly hold the planet shafts in place, thereby reducing manufacturing costs and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a snap ring is used to hold the planet shafts in place, then the planet shafts are secured, but manufacturing costs and complexity increase
Solution Approach 1:
The patent removes the snap ring component from the assembly, extracting the problematic element that caused increased manufacturing complexity and cost. The planet shafts are secured through an alternative design integrated into the carrier structure itself, eliminating the need for separate retaining elements.
Solution Approach 2:
The patent integrates the planet shaft securing function directly into the carrier structure by forming recesses and protrusions as integral parts of the carrier. This merging of functions reduces the total number of components and simplifies manufacturing while maintaining the securing capability.
2Reliability
If a snap ring is used to hold the planet shafts in place, then the planet shafts are secured, but manufacturing costs increase
Solution Approach 1:
The snap ring is completely removed from the design, eliminating the material cost, manufacturing cost, and assembly cost associated with this separate component. The securing function is achieved through the integrated carrier geometry.
Solution Approach 2:
The carrier structure itself provides the securing mechanism through its own geometric features (recesses and protrusions), making the system self-sufficient and eliminating the need for additional securing components that would increase manufacturing cost.
3Reliability
If a snap ring is used to hold the planet shafts in place, then the planet shafts are secured, but maintenance requirements increase
Solution Approach 1:
By removing the snap ring, the patent eliminates a potential failure point and a component that would require inspection and replacement during maintenance. The integrated design reduces maintenance complexity.
Solution Approach 2:
Instead of using a separate removable element (snap ring) to provide security, the patent inverts the approach by making the carrier structure itself provide the securing function through integral geometric features, thereby eliminating maintenance of separate securing components.
4Reliability
If a snap ring is used to hold the planet shafts in place, then the planet shafts are secured, but the assembly introduces a weak point
Solution Approach 1:
The snap ring, identified as a weak point in the assembly, is removed entirely. The integrated carrier design eliminates the stress concentration and potential failure points associated with separate retaining elements.
Solution Approach 2:
By merging the securing function into the carrier structure itself, the patent creates a more unified and structurally sound assembly. The integral design distributes stresses more evenly and eliminates weak points associated with separate components and their connections.
Data Source
AI summary
Systems are provided for a differential carrier assembly for a vehicle. In one example, a system includes a planet carrier coupled to a differential carrier and a planet carrier comprising a plurality of planet shafts including a cutout interfacing with a pilot interface of the differential carrier.