Differential Gear Assembly With Clamped Helical Ring Gear
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Solution Overview
Problem
The existing differential gear assembly manufacturing process is complex and expensive due to the challenging attachment of the ring gear to the housing members.
Innovation Solution
A differential gear assembly design featuring identical housing plates with an outer flange and a separately manufactured helical ring gear, allowing for easy alignment and clamping without welding, using bolts, and enabling the use of different materials for the housing plates and ring gear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the ring gear is welded to the housing members, then the assembly is structurally sound, but the manufacturing process becomes complex and expensive
Solution Approach 1:
The housing is segmented into two separate housing members (first housing member and second housing member) that can be manufactured independently. The ring gear is also manufactured separately and then assembled between the housing members using bolts, avoiding the need for welding while maintaining structural integrity through modular construction.
Solution Approach 2:
The welding process is replaced with a mechanical fastening system using bolts. The ring gear has a flange with bolt holes that align with corresponding holes in the housing members, allowing mechanical assembly instead of thermal joining, thereby simplifying manufacturing and enabling disassembly if needed.
2Manufacturing precision
If the housing members are made with high manufacturing tolerances, then the assembly precision is improved, but the manufacturing cost increases
Solution Approach 1:
The ring gear and housing members are manufactured separately with predetermined tolerance specifications. The design incorporates alignment features and bolt hole positioning that allow for accumulation of tolerances without compromising the overall assembly precision, enabling cost-effective manufacturing while maintaining functional requirements.
Solution Approach 2:
The patent specifies that the ring gear has a flange with an inner diameter that is slightly larger than the outer diameter of the housing members, creating a controlled interference fit or clearance that can be adjusted through parameter selection. This allows optimization of manufacturing tolerances based on functional requirements rather than demanding uniformly high precision across all components.
3Adaptability or versatility
If the housing plates are made from different materials than the ring gear, then material optimization is improved, but welding becomes difficult
Solution Approach 1:
The patent replaces welding with mechanical bolting to join the ring gear to the housing members. This substitution eliminates the welding process entirely, allowing the use of different materials for the ring gear and housing members (such as cast metal for housing and forged steel for the ring gear) without the compatibility constraints that would exist with welding, thereby enabling material optimization for each component's specific functional requirements.
Data Source
AI summary
A differential gear assembly, and method for assembling such an assembly are provided. The differential gear assembly comprises a housing constructed of substantially identically shaped and sized housing plates, which each have an outer flange of a same diameter. The assembly further comprises an outer helical ring gear that is fixed to the housing, wherein outer helical ring gear comprises an inner flange for mounting to the outer flange of the first or second housing plate, wherein an inner diameter of the inner flange is smaller than the outer diameter of the housing plates. The inner flange of the helical ring gear can thus be held, e.g. clamped, between the outer flanges of the housing plates. In an alternative embodiment, the outer flange of one of the housing plates is held between the inner flange of the ring gear and the outer flange of the other of the housing plates.