Differential Case and Planetary Carrier Layout for Pin Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power transmission devices face difficulties in easily detaching the fixing pin that secures the differential pinion shaft to the differential case, necessitating the breaking of the differential case for removal, which hinders reuse and maintenance.
Innovation Solution
The differential case is integrated with the planetary carrier, featuring a fixing pin insertion hole parallel to the differential case's axis and orthogonal to the pinion shaft insertion hole, allowing easy detachment of the fixing pin by aligning it with the pinion shaft insertion hole, thus enabling the differential pinion shaft to be removed without damaging the case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fixing pin is attached to the differential case to secure the pinion shaft, then the pinion shaft is firmly fixed, but the fixing pin cannot be easily detached after attachment
Solution Approach 1:
The fixing pin is divided into two functional segments: a head portion that remains in the differential case and a pin portion that protrudes and can be removed. This segmentation allows the fixing mechanism to provide reliable fixation when assembled while enabling easy detachment by simply removing the pin portion, resolving the contradiction between secure fixing and easy removal.
2Ease of operation
If the differential case is broken to remove the pinion shaft, then the pinion shaft can be detached, but the differential case cannot be reused
Solution Approach 1:
The fixing pin is extracted as a separate, removable component from the differential case structure. By using this external fixing element instead of integrating the pinion shaft directly into the case, the design allows the pinion shaft to be removed by simply taking out the fixing pin, completely avoiding the need to break or damage the differential case and enabling full reusability of the case.
3Ease of operation
If additional holes are added to the differential case for pin insertion, then the fixing pin can be attached, but the structural strength of the case is weakened
Solution Approach 1:
The through-hole in the differential case serves multiple functions: it allows the fixing pin to pass through for securing the pinion shaft, and it also serves as an access path for removing the pin during disassembly. This multi-functionality eliminates the need for separate removal holes, maintaining the case's structural integrity while enabling easy pin attachment and detachment.
Data Source
AI summary
A power transmission device includes a planetary gear mechanism and a differential gear mechanism, in which a differential case is formed in one piece with a planetary carrier in a state of being aligned with the planetary carrier in a rotation axis direction of the differential case, and is provided a fixing pin insertion hole through which a fixing pin for fixing a differential pinion shaft to the differential case is inserted, and the fixing pin insertion hole is provided at a position overlapping a pinion shaft insertion hole when the planetary carrier and the differential case are viewed from the rotation axis direction, one end of the fixing pin insertion hole communicates with the pinion shaft insertion hole, and another end thereof communicates with outside of the differential case on a side opposite to the planetary carrier.