ESC Pump Filter Placement and PEEK Piston Design
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Solution Overview
Problem
Piston pump assemblies for electronic stability control in automobiles often require separate inlet filters and struggle with debris from manufacturing, leading to inefficiencies and increased costs.
Innovation Solution
A filter is positioned downstream of the check valves in the fluid flow path, and the pump assembly incorporates a PEEK piston with carbon filler, a metal sleeve with varying wall thicknesses for reduced manufacturing costs and improved durability, and a damper cup with an adjustable orifice for noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pump inlet filter is used to filter debris from the fluid, then the fluid cleanliness is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the inlet filter and outlet filter into a single integrated filter assembly. The filter is positioned downstream of the check valves and serves dual purposes: filtering debris from the fluid before it enters the pump (inlet function) and filtering debris generated during pump operation (outlet function). This merging eliminates the need for separate inlet and outlet filters, reducing device complexity while maintaining fluid cleanliness.
Solution Approach 2:
The single filter assembly performs multiple functions: it acts as both an inlet filter and an outlet filter, and also serves as a debris collection point for manufacturing debris. This multi-functional design reduces the overall number of components needed in the pump assembly while maintaining comprehensive filtration capability.
2Reliability
If separate inlet filters are used for each check valve, then the filtering effectiveness is improved, but the manufacturing cost and device complexity increase
Solution Approach 1:
Instead of providing separate inlet filters for each check valve, the patent merges the filtration function into a single filter assembly positioned downstream of both check valves. This consolidated filter design reduces manufacturing complexity and cost while still providing effective filtration for the fluid passing through both valve paths.
3Reliability
If a large filter is positioned upstream of the check valves, then all debris is filtered, but the filter size and manufacturing cost increase
Solution Approach 1:
The check valves perform preliminary action by filtering out large debris particles before the fluid reaches the main filter. This preliminary filtration allows the downstream filter to be smaller in size, as it only needs to handle the finer debris that passes through the check valves, rather than needing to filter all debris from the beginning.
Solution Approach 2:
The filtration system is segmented into two stages: first, the check valves provide coarse filtration of large debris particles; second, the downstream filter provides fine filtration of smaller debris. This segmentation allows each component to be optimized for its specific function, resulting in a more compact overall filter size compared to a single large filter handling all filtration tasks.
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 eliminates the need for a pump inlet filter, reduces manufacturing costs, enhances durability, and minimizes noise while maintaining high performance and efficiency.
Implementation Method 1
A filter is disposed in the bore of the pump housing downstream of each of the check valves for filtering debris from the fluid
Implementation Method 2
an eccentric engages and drives the piston to propel the fluid through the fluid flow path
Data Source
Figure 1
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Figure 4
AI summary
A piston pump assembly for pumping a fluid including a pump housing defining a bore. The pump housing further defines a fluid inlet and a fluid outlet and a fluid flow path extending therebetween for conveying the fluid from the fluid inlet to the fluid outlet. A piston is slidably disposed in the bore of the pump housing, and an eccentric engages the piston to propel the fluid through the fluid flow path. An inlet check valve and an outlet check valve body are disposed in the bore for only allowing the fluid to flow in one direction from the fluid inlet to the fluid outlet. A filter is disposed in the fluid flow path downstream of the inlet check valve and the outlet check valve body and adjacent to a damper orifice for filtering debris from the fluid before the fluid is conveyed to the fluid outlet.