Differential Gear Unit Radial Fit Layout for Reduced Axial Size
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Solution Overview
Problem
Existing differential gear units face challenges in reducing their size in the axial direction due to the arrangement of components, which are difficult to minimize in this dimension.
Innovation Solution
The differential gear unit is designed with a configuration where the first and second fitted portions overlap the clamped portion radially, allowing for a reduction in axial size by arranging the fastening members and gear components to minimize overlap in the axial direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first fitted portion and the first fitting portion are arranged offset in the axial direction from the clamped portion, then the assembly process is simpler, but the axial size of the differential gear unit increases
Solution Approach 1:
The patent transitions from an axial arrangement (offset in axial direction) to a radial arrangement (overlapping in radial direction) of the fitted portions relative to the clamped portion. This dimensional change allows the fastening members to engage through the clamped portion while the fitted portions are positioned radially inward, thereby reducing axial size without compromising assembly feasibility
2Length of moving object
If the first fitted portion and the first fitting portion are arranged to overlap the clamped portion radially, then the axial size is reduced, but the structural complexity increases
Solution Approach 1:
The patent merges the functions of multiple components by positioning the first fitted portion and first fitting portion to overlap the clamped portion radially. The fastening members pass through all these overlapping portions simultaneously, combining the clamping and fitting functions into a unified structural arrangement that reduces axial size while managing complexity through functional integration
Data Source
AI summary
A differential gear unit includes a first case member, a second case member, and an outer peripheral gear member. The first case member includes a clamped portion, a first fitted portion, and a second fitted portion. The second case member includes a first clamping portion and a first fitting portion. The outer peripheral gear member includes a second clamping portion and a second fitting portion. The clamped portion, the first clamping portion, and the second clamping portion are fixedly fastened together by a fastening member. The first fitted portion and the first fitting portion are located inward of the clamped portion, the second fitted portion, and the second fitting portion in a radial direction, and are arranged so as to overlap the clamped portion as viewed radially in the radial direction.