Piston Pump Valve Damping via Radial Flow Channels
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Solution Overview
Problem
Existing valve designs for hydraulic vehicle brake systems with two-part closing bodies and damping pistons face challenges in achieving optimal damping behavior, leading to inert responses and excessive hydraulic damping, which affects the efficiency and assembly of the valve assembly.
Innovation Solution
Incorporating flow channels around the damping piston and piston guide, specifically radially directed slots or grooves, to enhance fluid flow and reduce damping, allowing for quicker reaction times and improved centering of the closing body on the valve opening, while preventing excessive hydraulic damping and enabling the use of smaller drive motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the damping piston is guided in a cylindrical piston guide without flow channels, then the damping behavior is excessive and the response is inert, but adding flow channels increases fluid flow and reduces damping
Solution Approach 1:
The piston guide is segmented with multiple radially directed slots that divide the fluid flow path into multiple channels. This segmentation allows fluid to flow around the damping piston through multiple pathways, reducing the overall hydraulic damping while maintaining controlled damping behavior. The slots are distributed around the circumference to ensure uniform flow distribution.
Solution Approach 2:
The piston guide has different local properties: the regions with slots allow free fluid flow to reduce damping, while the solid regions between slots provide structural support and controlled damping. This local differentiation of properties enables the system to achieve both reduced excessive damping and maintained structural integrity.
2Loss of time
If the closing body is configured to be quicker to react, then the valve response time is reduced, but the damping piston requires precise centering on the valve opening
Solution Approach 1:
The damping piston automatically centers itself on the valve opening through the fluid flow generated by the slots in the piston guide. The fluid pressure distribution created by the slots provides a self-centering force that eliminates the need for high manufacturing precision. The system uses the operating fluid itself to achieve the centering function.
Solution Approach 2:
The fluid flow parameters (flow rate, pressure distribution) are changed dynamically to achieve centering. The slots allow fluid to flow in a manner that creates pressure differences, which in turn create forces that center the damping piston on the valve opening, enabling quick response without requiring tight manufacturing tolerances.
3Ease of manufacture
If the two-part closing body is used for selective closing of valve openings, then assembly is favorable and automatable, but the damping behavior needs optimization for efficient operation
Solution Approach 1:
The closing body is divided into two separate parts (damping piston and closing element) that can be manufactured and assembled independently. The damping piston with slots is manufactured separately and then assembled with the closing element, allowing for automated assembly processes while optimizing the damping behavior through the slot configuration.
Solution Approach 2:
The damping characteristics are optimized by changing the geometric parameters of the slots (number, size, distribution) to achieve the desired damping behavior. This allows the valve to operate efficiently with reduced internal pressures while maintaining the favorable two-part construction for automated manufacturing.
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
The modified geometry with flow channels improves the damping behavior and efficiency of the valve assembly, reducing internal pressures and allowing for more efficient operation with smaller drive motors, while maintaining cost-neutrality and automatability in production.
Implementation Method 1
excessive hydraulic damping of the damping piston can be prevented by means of the encircling flow according to the disclosure
Data Source
AI summary
A valve of a piston pump for a vehicle brake system having a closing body which is resiliently preloaded against a sealing seat. The closing body is formed in two parts with a damping piston and a closing element inserted therein. The damping piston is axially displaceably guided in a cylindrical piston guide. At least one flow channel is provided between the damping piston and the piston guide. The at least one flow channel is configured such that fluid can flow around the damping piston in the longitudinal direction thereof through the at least one flow channel.