Transmission Coupling Element Recess Layout for Gearset Lubrication
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Solution Overview
Problem
Existing coupling elements in transmissions do not efficiently enhance the lubricating function and operational efficiency during mechanical coupling of planetary gearsets.
Innovation Solution
A coupling element with an inner toothing, outer toothing, and recesses is designed to improve torque transmission and lubrication. The recesses, which can extend radially and axially, enhance oil flow and distribution, while the circumferential grooves facilitate the positioning of securing elements and thrust washers for improved axial positioning and lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coupling element connects two planetary gearsets with torque-proof connection, then the mechanical coupling and torque transmission are improved, but the lubricating function and oil distribution are insufficient
Solution Approach 1:
The coupling element is segmented with multiple recesses (at least two) distributed along its circumference, creating separate oil reservoirs that distribute lubricating oil to different regions of the planetary gearset, thereby improving lubrication coverage while maintaining torque transmission capability
Solution Approach 2:
The coupling element features localized oil supply zones created by circumferentially distributed recesses, providing targeted lubrication to specific bearing and gear contact areas without compromising the overall structural integrity and torque transmission function
2Ease of manufacture
If the coupling element has a simple annular structure with inner and outer toothing, then the manufacturing is simplified, but the oil flow and lubrication distribution are inadequate
Solution Approach 1:
The coupling element incorporates multiple circumferentially distributed recesses that segment the oil flow path, enabling improved lubrication distribution while maintaining a relatively simple annular structure that can be manufactured using conventional machining processes
Solution Approach 2:
The recesses are positioned at different axial locations (first end region and second end region) of the coupling element, creating three-dimensional oil distribution channels that enhance lubrication coverage without significantly complicating the basic annular structure
3Reliability
If recesses are added to the coupling element for oil distribution, then the lubricating function is enhanced, but the structural complexity increases
Solution Approach 1:
The coupling element uses a moderate number of recesses (at least two) that are circumferentially distributed, providing effective lubrication enhancement while avoiding excessive structural complexity that would complicate manufacturing and assembly
Solution Approach 2:
The recesses serve multiple functions: they act as oil reservoirs, guide oil flow paths, and potentially serve as positioning features for securing elements, thereby enhancing lubrication without proportionally increasing structural complexity
Data Source
AI summary
A coupling element for coupling a first gearset and a second gearset of a transmission. The coupling element having an annular body, an inner circumference of the annular body defining an inner toothing, an outer circumference of the annular body defining an outer toothing, and a first end region of the annular body in an axial direction defining a recess.