Piston Pump Sealing Element Radial Expansion Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Modern piston pumps in motor vehicle dynamics control systems face challenges in extending useful life and operating under high system pressure, particularly due to insufficient resistance to slot extrusion and wear of sealing elements, which are exacerbated by temperature and pressure variations.
Innovation Solution
The seat for the sealing element is designed to generate radial forces expanding the sealing element, producing elastic deformation and enhanced sealing contact pressure, with a structure featuring intermittent abutment surfaces and varying profiles to accommodate changing hydraulic pressures, allowing for a fluid-tight elastic clamping arrangement and reduced frictional resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the sealing element is expanded into a wedge-shaped slot to increase extrusion resistance, then the resistance to slot extrusion is improved, but the contact pressure between cylinder and sealing element is reduced
Solution Approach 1:
The seat for the sealing element is segmented into multiple levels with varying abutment surfaces. The first level has a first abutment surface that contacts the sealing element at a first radial position, while the second level has a second abutment surface that contacts the sealing element at a second radial position. This segmentation allows different regions of the sealing element to be supported at different radial positions, maintaining both extrusion resistance and contact pressure.
Solution Approach 2:
Different regions of the seat are designed with different local qualities - the first level provides support at a first radial position with specific abutment characteristics, while the second level provides support at a second radial position with different abutment characteristics. This local differentiation allows the sealing element to maintain proper contact pressure in critical areas while having space to deform in other areas for extrusion resistance.
2Reliability
If the sealing element is supported within the groove to maintain sealing effect, then the sealing effect is improved, but the resistance to slot extrusion is reduced
Solution Approach 1:
The support structure is segmented into two levels with different abutment surfaces. The first level provides support for sealing effect maintenance, while the second level provides additional support for extrusion resistance. This segmentation allows both functions to be optimized independently in different radial positions.
Solution Approach 2:
The problem is solved by adding a dimensional aspect - the seat is structured with two distinct levels at different radial positions rather than a single support surface. This multi-level structure provides both sealing support and extrusion resistance simultaneously by distributing support functions across different radial dimensions.
3Productivity
If the system pressure is increased to improve pump performance, then the productivity is improved, but the slot extrusion of sealing element is exacerbated
Solution Approach 1:
The multi-level seat structure provides preliminary support to the sealing element before high pressure acts on it. The first and second abutment surfaces are positioned to prevent extrusion from the outset, counteracting the extrusion force before it can cause damage. This preliminary protective action allows the system to operate at high pressures without compromising seal integrity.
Solution Approach 2:
The structured seat with multiple levels acts as a cushioning structure that absorbs and distributes the extrusion forces before they reach the sealing element. The varying abutment surfaces provide progressive support that cushions the seal against high pressure-induced extrusion, allowing high productivity operation without seal failure.
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 design improves sealing effectiveness, increases resistance to slot extrusion, and extends the useful life of the pump by ensuring a progressive and automated assembly process while maintaining a precise support for the sealing element.
Implementation Method 1
producing elastic deformation and enhanced sealing contact pressure between piston and cylinder
Implementation Method 2
the sealing element is required to exhibit a certain ability of bridging the slot or a certain shearing resistance
Data Source
AI summary
A piston pump for the hydraulic energy supply in a motor vehicle, comprising a piston that is movably arranged in a stepped bore of an accommodating member that is provided with a closure, the piston carries a seat for an elastic sealing element which accommodates the sealing element with axial play, and with radial elastic preload for the purpose of sealing between piston and cylinder. The seat for the sealing element has a structure which generates forces pointing radially towards a piston axis and expanding the sealing element in a radial direction, and that the structure produces an elastic deformation of the sealing element for an increased and dosed sealing contact pressure between piston and cylinder.