Three-Stage Oil Filter Element With Spacer-Guided Centering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing filter elements for lubricating oil face challenges such as difficulty in centering during replacement, inadequate separation of water and oil aging products, and excessive pressure drop due to varying fluid viscosity and temperature.
Innovation Solution
A three-stage filter element with cylindrical fine, main, and protective filter bodies, each with distinct filter fineness, and a bypass valve system, supported by spacer elements that maintain centering and minimize pressure drop, while incorporating superabsorbents and filter layers to absorb water and adsorb oil aging products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the filter element is supported only by fixing tabs that engage with the cover, then the filter element is centered in the filter housing when closed, but the filter element contacts the filter housing inner walls when the cover is removed, making element replacement difficult
Solution Approach 1:
Spacer elements are introduced as intermediary components between the filter element and filter housing. These spacers maintain the centered position of the filter element within the housing during both installation and replacement operations, preventing contact with the housing inner walls while the cover is removed.
Solution Approach 2:
The centering function is segmented from the fixing tabs and assigned to dedicated spacer elements. This separation allows the fixing tabs to focus on securing the filter element to the cover, while the spacers independently maintain the radial positioning and prevent wall contact during maintenance operations.
2Manufacturing precision
If multiple filter bodies with different fineness are used to achieve different purity levels, then filtration performance improves, but pressure drop increases
Solution Approach 1:
Different filter bodies are assigned different local filtration qualities (fineness levels) matched to specific contamination types. The coarse filter handles large particles and water, the main filter handles medium particles, and the fine filter handles small particles and oil aging products. This localized quality differentiation optimizes the pressure-purity trade-off by directing different fluid streams through appropriately sized filters.
Solution Approach 2:
The bypass valve dynamically adjusts fluid flow distribution based on operating conditions such as temperature and viscosity. When oil viscosity is high (cold operation), the bypass valve opens to allow more flow through the bypass, reducing pressure drop. When viscosity decreases (warm operation), the bypass valve closes to direct flow through all filter stages for maximum purity.
3Productivity
If the bypass valve is designed to open at high pressure, then fluid flow is maintained during cold startup, but the bypass valve may remain open during normal operation, reducing filtration effectiveness
Solution Approach 1:
The bypass valve is designed with a specific pressure threshold parameter that triggers opening only under extreme conditions (cold startup with high viscosity). Once the oil warms up and viscosity decreases, the pressure differential drops below the threshold and the valve automatically closes, restoring full filtration effectiveness without manual intervention.
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 filter element replacement, enhances filtration performance by adapting to fluid viscosity and temperature changes, and effectively separates water and oil aging products, maintaining uniform filtration and low resistance.
Implementation Method 1
The fine filter body (2) is designed to absorb water from the fluid flow
Implementation Method 2
a filter layer arrangement (30) for adsorbing oil aging products
Implementation Method 3
a cylindrical fine filter body (2) forming a fine filter stage (2')
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a cylindrical filter element (1) for filtering a fluid flow, in particular for filtering lubrication oil, wherein the filter element (1) has a cylindrical fine filter body (2), which forms a fine filter stage (2'), a cylindrical main filter body (3), which forms a main filter stage (3'), and a cylindrical protection filter body (4), which forms a protection filter stage (4'), wherein the fine filter body (2) and the main filter body (3) are axially sequential and enclose a cavity (5) of the filter element (1), such that the fine filter stage (2') and the main filter stage (3') are arranged fluidically parallel, wherein the protection filter body (4) is arranged in said cavity (5) such that the protection filter stage (4') is fluidically downstream of the fine filter stage (2') and the main filter stage (3'), having a first end plate (6), on which at least one bypass valve (7) for circumventing the fine filter stage (2') and the main filter stage (3') is formed, having an intermediate plate (9), which axially connects the fine filter body (2) to the main filter body (3). It is essential to the invention that at least two radially protruding spacer elements (10), which are spaced apart from each other in the circumferential direction, are formed on the intermediate plate (9), distributed over the circumference of the intermediate plate (9).