Vehicular Transmission Strainer Positioning for Valve Stick Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In vehicle transmissions with a valve body on the front or rear side, reducing valve clearance to improve fuel efficiency leads to increased risk of valve stick due to foreign material entry, and enlarging the strainer to mitigate this causes mounting issues as transmissions shrink in size.
Innovation Solution
A strainer is positioned between the side cover and valve body, with an inflow portion above the oil surface and an outflow portion below, allowing gravity-driven filtration without expanding the side cover, and optionally including a filter in the space formed between the side cover and strainer to enhance filtering efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the valve clearance is made smaller to reduce consumption flow rate and improve fuel efficiency, then energy efficiency is improved, but the risk of valve stick increases due to foreign material entry
Solution Approach 1:
The patent changes the parameters of the strainer including its size, mesh density, and positioning to optimize the balance between maintaining small valve clearance for energy efficiency and preventing foreign material entry that causes valve stick. The strainer is designed with specific dimensions and placement to filter contaminants effectively while allowing sufficient hydraulic flow.
2Reliability
If the strainer is made larger to improve filtering efficiency and prevent valve stick, then reliability is improved, but it becomes difficult to mount the strainer on a compact transmission
Solution Approach 1:
The patent positions the strainer in the vertical dimension between the side cover and valve body, utilizing the height space rather than expanding the horizontal footprint. This allows a larger effective filtering area to be achieved without increasing the transmission's overall width or length, thereby maintaining compact dimensions while improving filtering capability.
Solution Approach 2:
The strainer is nested within the existing transmission structure, specifically positioned in the space between the side cover and valve body. This nested arrangement allows the strainer to be integrated into the compact transmission design without requiring additional external space, enabling effective filtering within limited internal volume.
3Reliability
If a larger strainer is used to ensure filtering efficiency, then reliability is improved, but the transmission size increases making it difficult to mount
Solution Approach 1:
The strainer is oriented vertically and positioned between the side cover and valve body, utilizing the vertical space dimension. This allows the strainer to have sufficient filtering area without increasing the transmission's horizontal dimensions, thereby maintaining a compact overall size while achieving effective filtering performance.
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 configuration allows for a larger, more effective strainer without expanding the side cover, reducing hydraulic pressure loss and improving filtering efficiency while preventing valve interference, thus enhancing mountability and performance.
Implementation Method 1
a strainer for removing a foreign material in a hydraulic oil is disposed between the side cover and the valve body
Implementation Method 2
a filter for filtering is disposed in the first space, the hydraulic oil flowing into the first space from the inflow portion passes through the filter and flows out from the outflow portion
Data Source
AI summary
A vehicle transmission having a valve body disposed adjacently to and in parallel with a side cover covering a front or rear side or a side surface of a transmission case in a vehicle width direction in a vehicle-mounted state, the side cover connected to the transmission case, in which an electromagnetic valve is included on the side cover side of the valve body, when viewed in a direction horizontal and parallel to mating surfaces of the transmission case and the side cover, a strainer for removing a foreign material in a hydraulic oil is disposed between the side cover and the valve body to overlap with at least a portion of the electromagnetic valve, and the strainer has an inflow portion for allowing the hydraulic oil to flow in disposed vertically above an oil surface.