Multi-Piece Cross-Pin Assembly for Differential Pinion Securing
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Solution Overview
Problem
Existing differential assemblies face complexity and cost issues in securing multiple pinion shafts relative to the differential housing efficiently.
Innovation Solution
A differential assembly with a cross-pin assembly that includes a center spider and multiple pins, where each pin is axially translated and coupled to the spider for rotation, with features like stepped posts and chamfered surfaces to prevent axial translation and rotation, ensuring robust and cost-effective securing of pinion gears.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple pinion shafts are secured using traditional coupling methods, then the differential assembly can function properly, but the structural complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple pinion shafts (first, second, and third pinion shafts) into a single integrated cross-pin assembly that rotates together about a common axis. This merging of previously separate components into one unified structure reduces the number of individual parts and simplifies the overall coupling mechanism while maintaining the differential's functional reliability.
Solution Approach 2:
The cross-pin assembly serves multiple functions simultaneously: it supports three pinion gears, provides a common rotation axis, and couples all pinion shafts to the differential case through a single integrated structure. This multi-functionality eliminates the need for separate coupling mechanisms for each pinion shaft, thereby reducing structural complexity.
2Reliability
If multiple pinion shafts are secured using traditional coupling methods, then the differential assembly can function properly, but the manufacturing cost increases
Solution Approach 1:
By merging multiple pinion shafts into a single cross-pin assembly, the patent reduces the number of manufacturing operations, assembly steps, and fastening components required. This consolidation lowers manufacturing complexity and associated costs while ensuring reliable securing of all pinion shafts through the unified structure.
3Stability of the object's composition
If pinion shafts are securely coupled to the differential housing, then rotational stability is improved, but the device complexity increases
Solution Approach 1:
The cross-pin assembly provides a universal coupling mechanism that simultaneously ensures rotational stability for three pinion shafts. By designing a single multi-functional component that handles multiple shafts together, the patent achieves rotational stability without proportionally increasing complexity, as the stabilizing function is integrated rather than replicated across multiple separate mechanisms.
Data Source
AI summary
A differential assembly can include a case, a first side gear, a second side gear, a first pinion gear, a second pinion gear, a third pinion gear, and a cross-pin assembly. The case can be adapted to be supported for rotation about an output axis. The first and second side gears can be disposed within the case and rotatable about the output axis relative to the case. The first, second, and third pinion gears can be disposed within the case and meshingly engaged with the first and second side gears. The cross-pin assembly can include a spider, first, second, and third pins. The proximal end of the first pin can define a first bore that can receive a post of the spider to couple the first pin to the spider. Each pinion gear can be supported by one of the pins for rotation relative to the case.