Seamless Annular Interaxle Differential Case for Lower Wear
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Solution Overview
Problem
Existing interaxle differential units often require multiple parts and assembly steps, leading to increased weight and potential wear from high-speed pinion gear friction, which affects durability and efficiency.
Innovation Solution
A seamless annular case is formed through piercing, ring roll forging, and heat treatment to create a one-piece interaxle differential unit, reducing assembly steps and weight while enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple parts are used in interaxle differential units, then assembly flexibility is improved, but device complexity and weight increase
Solution Approach 1:
The patent merges multiple separate components (case, cover, pinion gears, bearings) into a single integrated differential unit. The case and cover are formed as one piece through ring roll forging, and the pinion gears are permanently attached to the case during the forging process, eliminating the need for separate assembly steps and reducing the total number of parts while maintaining functional flexibility
2Adaptability or versatility
If multiple assembly steps are used, then manufacturing flexibility is improved, but productivity decreases and weight increases
Solution Approach 1:
The pinion gears and bearings are pre-positioned and permanently attached to the case during the ring roll forging process itself, before the final product is completed. This preliminary action eliminates subsequent assembly steps for installing these components, significantly improving productivity while maintaining the flexibility to produce different differential unit configurations through variations in the forging process
3Ease of manufacture
If traditional multi-part construction is used, then ease of manufacture is improved, but durability decreases due to friction wear
Solution Approach 1:
By permanently attaching the pinion gears to the case through the ring roll forging process, the patent eliminates the relative motion and friction wear that occurs between separate mating parts. The integrated construction removes interfaces where wear could occur, significantly improving durability and reliability while the forging process itself remains a well-established manufacturing method
4Reliability
If seamless ring construction is used, then durability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses ring roll forging, which fundamentally changes the manufacturing approach from assembling multiple parts to forming a seamless structure in one piece. While the forging process itself is specialized, it eliminates the need for welding, bolting, or other complex joining operations, and the process parameters can be adjusted to produce different differential unit configurations, maintaining manufacturing flexibility
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
The method results in a more efficient, lightweight interaxle differential unit with improved durability and reduced wear from high-speed pinion gear friction, enhancing the unit's operational life and efficiency.
Implementation Method 1
The workpiece may be ring roll forged to form an annular case that is a seamless ring
Implementation Method 2
An annular case may be heat treated after ring roll forging
Data Source
AI summary
An interaxle differential unit and an axle assembly comprising an interaxle differential unit. The interaxle differential unit comprises an annular case and an interaxle differential unit gear nest. The annular case comprises first and second enlarged lips extending from first and second end surfaces, respectively. The interaxle differential unit gear nest is disposed in the annular case.