Two-Piece Standpipe for Accurate Transmission Oil Fill Level
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Solution Overview
Problem
Current stand-pipe designs in automobile transmission oil pans provide false indications of oil fill levels due to oil flowing directly into the stand-pipe before the desired level is reached, leading to insufficient oil volume, and are limited to single transmission designs as they are one-piece units with fixed lengths.
Innovation Solution
A two-piece stand-pipe system with a clinch nut and a stand-pipe, featuring side-wall ports that allow oil entry at a predetermined level, an end cap to prevent false entry, and a threaded plug for sealing, enabling accurate oil fill level indication and adaptability to different transmission designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a one-piece stand-pipe with fixed length is used, then the structure is simple and easy to manufacture, but it provides false oil level indications and cannot adapt to different transmission designs
Solution Approach 1:
The stand-pipe is divided into two separate pieces: a clinch nut that remains fixed in the oil pan, and a stand-pipe section that can be removed and replaced. This segmentation allows the stand-pipe length to be adjusted for different transmission designs while maintaining a simple fixed structure for the mounting component, thus resolving the contradiction between manufacturing simplicity and reliability.
Solution Approach 2:
The stand-pipe system transitions from a static fixed-length design to a dynamic adjustable design where the stand-pipe section can be removed from the clinch nut. This allows the system to adapt to different transmission configurations while keeping the clinch nut as a permanent, simple mounting structure.
2Ease of operation
If an open top stand-pipe is used, then oil can freely enter and provide visual indication, but oil flowing downward during fill provides false discharge indication before desired fill level
Solution Approach 1:
The end cap is removed from the stand-pipe, extracting the obstruction that prevented accurate measurement. By opening the top of the stand-pipe, oil can freely enter and provide accurate visual indication of the true oil level, eliminating false indications while maintaining ease of operation.
Solution Approach 2:
The stand-pipe acts as an intermediary channel that allows oil to flow from the transmission interior to the exterior in a controlled manner. The side discharge port positioned at the desired fill level serves as an intermediate indication point that accurately reflects the true oil level without being affected by downward-flowing oil.
3Device complexity
If the stand-pipe length is fixed, then the structure is simplified, but it cannot accommodate different transmission designs requiring different oil fill levels
Solution Approach 1:
The stand-pipe system is segmented into a permanent clinch nut component and a removable stand-pipe section. This allows different length stand-pipe sections to be used with the same clinch nut, providing adaptability to different transmission designs while keeping the overall device complexity low through standardization of the mounting component.
Solution Approach 2:
The clinch nut is designed as a universal mounting component that can accommodate different stand-pipe lengths and potentially different transmission designs. This multi-functional design allows a single clinch nut type to serve multiple purposes across various transmission configurations, enhancing adaptability without increasing device complexity.
Data Source
AI summary
An automobile transmission hydraulic oil fill system includes a transmission oil pan and a two-piece standpipe system. The two-piece stand-pipe system includes a clinch nut connected to the oil pan and having a threaded bore opening through the oil pan. A stand-pipe is fixed to the clinch nut. The stand-pipe includes a longitudinal bore in fluid communication with the threaded bore. An end cap defining a free end of the stand-pipe prevents entrance of hydraulic oil into the longitudinal bore of the stand-pipe during hydraulic oil fill of the transmission. Multiple ports created in a side wall of the stand-pipe allow entrance of the hydraulic oil into the longitudinal bore and to flow out of the threaded bore of the clinch nut. Each of the ports include an edge. The edges of the ports define a hydraulic oil fill level of the transmission.