Transmission Oil Supply via Segmented Power Extraction Case
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Solution Overview
Problem
Conventional vehicle transmissions face challenges in efficiently supplying oil to gear type power extraction mechanisms due to potential interference from bearings in the intermediate transmission chamber.
Innovation Solution
A vehicle transmission design featuring a power extraction case with an oil communication passage between the transmission case and gear accommodation chamber, along with a switching mechanism for power transmission between two-wheel and four-wheel drive, and an oil passage formed by a recess and rib in the transmission case to ensure consistent oil supply to the gear type power extraction mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bearing is arranged in the intermediate transmission chamber to support the gear shaft, then the gear shaft can be properly supported, but oil supply from the transmission case to the gear accommodation chamber is interfered with
Solution Approach 1:
The patent divides the power extraction case into two separate chambers: the gear accommodation chamber for housing the power extraction mechanism and the intermediate transmission chamber for housing the bearing and facilitating fluid communication. This segmentation allows the bearing to be positioned in the intermediate chamber where it supports the gear shaft while the oil communication passage is routed through this chamber to supply oil to the gear accommodation chamber without being blocked by the bearing.
Solution Approach 2:
The intermediate transmission chamber acts as an intermediary space that mediates between the transmission case and the gear accommodation chamber. It provides a pathway for oil flow (through the oil communication passage) while housing the bearing that supports the power extraction shaft, thus facilitating both mechanical support and fluid communication without direct interference.
2Reliability
If oil is supplied through the intermediate transmission chamber to the gear accommodation chamber, then the gear mechanism can be lubricated, but the bearing interferes with the oil flow path
Solution Approach 1:
By segmenting the power extraction case into distinct chambers with dedicated functions, the patent creates a clear oil flow path through the intermediate transmission chamber that bypasses the bearing. The oil communication passage is specifically routed through this intermediate chamber, ensuring that lubrication reaches the gear accommodation chamber without the bearing obstructing the flow.
3Volume of moving object
If the power extraction case is integrated with the transmission case, then space is saved, but oil supply to the power extraction mechanism becomes difficult
Solution Approach 1:
The patent integrates the power extraction case with the transmission case while maintaining internal segmentation through the creation of distinct chambers. The power extraction case is linked to the transmission case side wall, saving external space, while internally it is divided into the gear accommodation chamber and intermediate transmission chamber. This internal segmentation facilitates the oil communication passage routing, making oil supply easier despite the integrated external structure.
Solution Approach 2:
The patent utilizes the internal three-dimensional space of the integrated power extraction case to create vertical or lateral chamber divisions. The intermediate transmission chamber is positioned to facilitate oil flow from the transmission case through the power extraction case to the gear accommodation chamber, effectively using spatial dimensionality to resolve the oil supply challenge within the integrated structure.
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
Facilitates easy oil supply to the gear type power extraction mechanism, even during vehicle acceleration, while maintaining efficient power transmission switching between two-wheel and four-wheel drive modes.
Implementation Method 1
the power extraction case is provided with an oil communication passage for establishing fluid communication between the inside of the transmission case and the gear accommodation chamber
Implementation Method 2
an intermediate transmission chamber for establishing fluid communication between the gear accommodation chamber and an inside of the transmission case
Implementation Method 3
the recess and the rib are formed such that rear parts thereof are higher than front parts thereof
Data Source
AI summary
A vehicle-use transmission includes a transmission case accommodating a transmission mechanism; and a power extraction case linked to a side wall of the transmission case and accommodating a gear type power extraction mechanism linked to a power extraction shaft of the transmission mechanism. The power extraction case includes: a gear accommodation chamber for accommodating the gear type power extraction mechanism; and an intermediate transmission chamber for establishing fluid communication between the gear accommodation chamber and the inside of the transmission case. The power extraction case is provided with an oil communication passage for establishing fluid communication between the inside of the transmission case and the gear accommodation chamber.