Oil Passage Control Valve Filter Fixation With Notched Sleeve Alignment
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Solution Overview
Problem
Conventional oil passage control valves face challenges in complex manufacturing processes and increased costs due to intricate filter designs, and there is a risk of misalignment and material wastage in filter positioning, leading to potential operational issues.
Innovation Solution
An oil passage control valve design featuring a sleeve with protrusions and a filter member with notches allows for easy assembly and secure fixation, reducing complexity and costs while enhancing positional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the mask part of the filter is formed as a concave part or concave groove to cover the convex part of the valve body, then the filter can be positioned in the circumferential direction, but the molding or machining becomes complex and costs increase
Solution Approach 1:
Instead of forming a complex concave groove in the filter to match a convex regulation part, the invention inverts the approach by forming a simple protrusion on the regulation part that fits into a corresponding notch on the filter. This simplifies the filter structure while maintaining positioning accuracy.
Solution Approach 2:
The invention uses a simple, easily manufacturable filter structure with a notch that can be produced through basic punching or molding processes, replacing the complex concave groove design that requires sophisticated molding or machining operations.
2Reliability
If the engagement part of the filter member is formed as an extending piece from a metal plate, then the filter can be engaged with the sleeve, but unnecessary regions are discarded and material costs increase
Solution Approach 1:
The filter is designed as a continuous strip-like structure with a notch cut out to form the engagement portion, rather than creating separate extending pieces that would require discarding material. This segmentation approach allows the filter to be formed from a single strip with minimal waste.
Solution Approach 2:
Instead of discarding unnecessary regions when punching extending pieces from metal plates, the invention uses a notch cut approach where the removed material is minimal and the remaining structure forms the complete filter with integrated engagement features.
3Reliability
If the filter member is stretched and extended against elastic force to fit into the annular grooves, then the filter can be fixed securely, but a relatively thick metal plate is required and costs increase
Solution Approach 1:
Instead of requiring the entire filter to be made of thick material to provide sufficient rigidity, the invention uses a thin strip-like structure where rigidity is provided only at the engagement portion (the notch), allowing the rest of the filter to remain thin and lightweight.
Solution Approach 2:
The filter structure exhibits local quality by having a notch (engagement portion) with specific geometric properties that provide rigidity and engagement capability, while the rest of the strip maintains a thin profile for cost-effectiveness and ease of installation.
Data Source
AI summary
An oil passage control valve include: a sleeve, including an internal passage extending in an axis direction and through which hydraulic oil passes, an annular groove formed on an outer periphery, and an opening penetrating in a radial direction in a region of the annular groove and through which hydraulic oil passes; a valve body, slidably housed in the internal passage and opening and closing the opening; a filter member of a strip-like shape, annularly wrapped around and fixed to the annular groove; and a drive element, driving the valve body. The sleeve includes a protrusion protruding from a bottom surface and a side surface of the annular groove at a position offset from the opening within the region of the annular groove. The filter member includes a notch engaged with the protrusion, a filtration part facing the opening, and a joint where both end regions overlap.