Transmission Brake Lubrication Through Spline Groove Oil Injection
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Solution Overview
Problem
Existing automatic transmission systems require additional components like sleeves to distribute lubricating oil evenly around the circumference of friction engagement elements, leading to increased cost and weight.
Innovation Solution
An automatic transmission system with a tube that supplies lubricating oil to friction engagement elements through injection holes targeting the spline groove, allowing oil to flow along the inner peripheral surface and contact the spline teeth, thereby eliminating the need for a radial sleeve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radial sleeve is added to distribute lubricating oil evenly around the circumference of friction engagement elements, then lubrication effectiveness is improved, but device complexity and weight increase
Solution Approach 1:
The invention extracts and eliminates the radial sleeve component from the lubrication system. Instead of adding a sleeve to distribute oil, the patent uses injection holes formed directly in the tube to deliver lubricating oil to the spline groove, thereby simplifying the device structure while maintaining lubrication effectiveness
Solution Approach 2:
The invention introduces the spline groove as an intermediary structure that facilitates oil distribution. The injection holes deliver oil to the spline groove, which then serves as a channel to distribute lubricating oil to multiple friction engagement elements, replacing the need for a radial sleeve
2Reliability
If a radial sleeve is added to distribute lubricating oil, then lubrication coverage is improved, but manufacturing cost increases
Solution Approach 1:
The invention removes the radial sleeve component, thereby reducing manufacturing cost. The lubrication function is achieved through injection holes and the spline groove structure, which are integrated into the existing tube and transmission case rather than requiring additional manufactured parts
Solution Approach 2:
The invention merges the lubrication delivery function into the existing tube structure by forming injection holes directly in it. The tube combines the functions of structural support and lubricant delivery, eliminating the need for a separate radial sleeve component
3Device complexity
If injection holes are used to deliver oil to the spline groove, then device complexity is reduced, but oil distribution uniformity may be affected
Solution Approach 1:
The spline groove acts as an intermediary distribution channel that ensures uniform oil delivery. Multiple injection holes deliver oil to different positions along the spline groove, which then distributes oil evenly to multiple friction engagement elements through its groove structure
Solution Approach 2:
The injection holes are positioned at specific locations along the tube to target different sections of the spline groove. This localized injection approach ensures that each section of the spline groove receives adequate lubrication, maintaining uniform distribution across all friction engagement elements
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 solution effectively distributes lubricating oil to multiple friction engagement elements without the need for a radial sleeve, reducing cost and weight while ensuring efficient lubrication and cooling, especially during high-temperature conditions.
Implementation Method 1
a tube, which is provided in the transmission case, that supplies lubricating oil to the first friction engagement element and the second friction engagement element
Implementation Method 2
the injection holes open toward a gap, which is formed between the spline groove and the spline teeth, and inject the lubricating oil to cause the lubricating oil to contact a surface of the spline groove located above the spline teeth
Data Source
AI summary
An automatic transmission includes: a multi-disc brake including first and second friction engagement elements which are alternately arranged in an axial direction, and a tube that supplies lubricating oil to the first friction engagement element and the second friction engagement element in a transmission case. Further, the tube has injection holes that inject the lubricating oil toward a spline groove, which is fitted with spline teeth of the first friction engagement element on an inner peripheral surface of the transmission case, and the injection holes open toward a gap, which is formed between the spline groove and the spline teeth, and inject the lubricating oil to cause the lubricating oil to contact a surface of the spline groove located above the spline teeth.