Differential Gear Shaft Fixing for Pre-Weld Inspection Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing differential gear assemblies face challenges in ensuring a stable connection between the gear shaft and casing before the crown wheel is attached, making quality control and correction difficult, especially when the connection is permanently sealed by welding.
Innovation Solution
The design includes gear shafts with specific end surfaces and flats that allow for visible inspection and engagement of fastening members, such as pins, which are protected by the casing and can be inspected before the crown wheel is attached, ensuring a secure connection and simplifying quality control processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the crown wheel is permanently attached to the casing by welding, then the structural integrity is improved, but the ability to inspect and correct the connection between the casing and gear shafts is lost
Solution Approach 1:
The patent provides for inspection of the connection between the casing and gear shafts before the crown wheel is permanently attached by welding. This preliminary inspection allows detection and correction of connection issues before they are locked in by the permanent attachment, thus resolving the contradiction between structural integrity and inspection capability.
2Ease of manufacture
If the fastening member engages the gear shaft at its outer end surface, then the assembly process is simplified, but the fastening member is exposed to environmental conditions
Solution Approach 1:
The patent introduces the casing as an intermediary protective structure that encloses the fastening member and gear shaft connection. The casing acts as a barrier between the fastening member and environmental conditions, while still allowing the fastening member to engage the gear shaft effectively. This resolves the contradiction by protecting the connection from environmental factors while maintaining assembly simplicity.
3Reliability
If the gear shaft connection is made before attaching the crown wheel, then inspection and correction are possible, but the assembly sequence becomes more complex
Solution Approach 1:
The patent establishes a specific assembly sequence where the gear shaft connection with fastening members is made and inspected before the crown wheel is permanently attached. This preliminary completion of the connection allows for verification and correction, improving reliability. The sequence is structured to minimize complexity by performing critical connections early when access is available.
Data Source
Figure 1
Figure 2a~2c
AI summary
A differential gear assembly, comprising: • a casing extending along a longitudinal drive axis and adapted to receive end gears of first and second half shafts of a vehicle drive axle, the casing comprising at least one opening extending perpendicular to the drive axis between outer and inner bearing surfaces of the casing; • a first gear shaft received within the at least one opening of the casing; • a first differential side gear adapted to mesh with end gears of said first and second half shafts, the side gear being rotatably mounted on the first gear shaft; wherein the gear assembly further comprises at least one fastening member adapted to fix the first gear shaft with respect to the casing, and wherein the assembly is arranged in such a way that the at least one fastening member is visible from the outer bearing surface of the casing.