Differential Gear Case Fixing Portion for Precision Assembly
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Solution Overview
Problem
Conventional differential gear cases face challenges in high-precision assembly and machining due to relative displacement between mating surfaces of dies during casting, leading to difficulties in assembling the differential gear and machining the inside wall with high precision.
Innovation Solution
Incorporating a fixing portion on the container housing with parallel flat surfaces around the axis of rotation, which allows for precise positioning and fixing of the differential case, eliminating the need for reinforcing ribs and enabling high-precision assembly and machining without vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing ribs are added to increase mechanical strength, then strength is improved, but device complexity increases
Solution Approach 1:
The fixing portion is merged with the outer surface of the container housing to form an integrated structure. This combining of functions (fixing + structural integrity) eliminates the need for separate reinforcing ribs, thereby improving strength without increasing device complexity
Solution Approach 2:
The fixing portion serves multiple functions: it provides fixing capability for the differential case and simultaneously acts as a structural reinforcement element. This multi-functionality replaces the need for dedicated reinforcing ribs, resolving the contradiction between strength and complexity
2Manufacturing precision
If fixing portion is provided on the opening-possessed area, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The fixing portion is formed as an integral part of the container housing outer surface, combining the housing structure with the fixing function. This integration provides precise positioning for assembly and machining without adding separate complex components
Solution Approach 2:
The fixing portion is pre-formed on the container housing during the casting process, establishing precise positioning features before assembly operations. This preliminary formation of fixing features ensures high manufacturing precision without requiring additional complex assembly steps
3Ease of manufacture
If relative displacement between dies occurs during casting, then ease of manufacture deteriorates, but manufacturing precision worsens
Solution Approach 1:
The fixing portion is designed to compensate for and counteract the effects of relative displacement between dies during casting. By providing a robust fixing feature that maintains functional precision despite positional variations, the invention prevents the worsening of manufacturing precision while preserving ease of casting
Data Source
AI summary
A differential gear case is provided that includes a container housing of a differential gear, the container housing having on an outer surface thereof an annular flange that extends around an axis of rotation of the container housing, and one of two areas of the container housing that are separated by the annular flange being formed with an opening that is communicated with a containing space formed in the container housing. The area of the container housing that is formed with the opening is provided with a fixing portion used for fixing the differential gear case. The fixing portion includes two flat surfaces that are in parallel with a plane surface containing the axis of rotation of the container housing and arranged around the axis of rotation keeping a space therebetween.