Differential Case Groove Layout for Gear Back-Side Lubrication
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Solution Overview
Problem
Existing differential cases fail to effectively lubricate the sliding contact portions between gears and the differential case, leading to potential seizure and reduced durability due to inadequate lubricant distribution.
Innovation Solution
A differential case design featuring grooves on the inner surface of the outer shell wall portion guides lubricant to the back surface of the gears, ensuring proper lubrication of the sliding contact areas between the gears and the differential case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional smooth inner surface is used in the differential case, then the manufacturing is simple, but the lubricant cannot be effectively guided to the sliding contact portions
Solution Approach 1:
The inner surface of the differential case is designed with grooves at specific locations where lubricant guidance is needed, while other areas maintain their conventional smooth surface. This localized modification ensures effective lubricant delivery to sliding contact portions without unnecessarily complicating the entire inner surface structure.
Solution Approach 2:
The continuous inner surface is segmented by introducing grooves that divide the surface into distinct regions. These grooves act as channels to guide lubricant flow to specific sliding contact areas, improving lubrication effectiveness while maintaining relative structural simplicity.
2Speed
If high-speed differential rotation is enabled, then the vehicle can navigate turns effectively, but the sliding contact portions experience increased wear due to inadequate lubrication
Solution Approach 1:
The grooves are pre-formed in the differential case inner surface to establish lubricant flow paths before the differential device operates. This preliminary structural preparation ensures that when high-speed differential rotation occurs, lubricant is already positioned to effectively lubricate the sliding contact portions, preventing wear even at high speeds.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances lubrication of the sliding contact portions, preventing seizure and improving the durability of the differential case by ensuring consistent lubricant distribution, even under high-speed conditions.
Implementation Method 1
a groove is formed in an inner surface of the outer shell wall portion on a back surface side of the gear... a lubricant in the outer shell wall portion is easily guided to the back surface side of the gear through the groove
Data Source
AI summary
A differential case includes an outer shell wall portion configured to accommodate a pinion gear therein, and a first groove is formed in an inner surface of the outer shell wall portion on a back surface side of the pinion gear. In addition, a convex portion is formed on the inner surface of the outer shell wall portion on the back surface side of the pinion gear, and the first groove is formed in the convex portion. Further, a diameter of the convex portion is equal to or larger than a diameter of a back surface of the pinion gear.