Hydraulic Valve Sealing Element for Robust Control
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Solution Overview
Problem
Hydraulic valves in mechatronic transmission controls require a balance between robustness and control quality, where high robustness often compromises control quality due to large play in parts, and contamination of the operating medium can impair magnetic and hydraulic functions, leading to potential failure.
Innovation Solution
A hydraulic valve design featuring a sealing element for spatial separation of magnetic and hydraulic parts, reducing the exchange of dirt particles and minimizing magnetic transverse forces, achieved through a cost-effective and simple pressing-in process of the sealing element into the valve sleeve, which forms a gap seal with the piston tappet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of play is provided in the parts to be moved to achieve high robustness, then the valve can tolerate contamination and wear, but the control quality deteriorates due to imprecise positioning
Solution Approach 1:
The valve is divided into two separate parts: a magnetic part containing the armature and pole tube, and a hydraulic part containing the valve piston and bushing. These parts are separated by a sealing element, allowing each to be optimized independently - the magnetic part can have tight clearances for precision while the hydraulic part handles contamination
Solution Approach 2:
A sealing element acts as an intermediary barrier between the magnetic and hydraulic parts. This sealing element prevents contaminated hydraulic fluid from entering the magnetic part while still allowing the valve piston to transmit forces effectively, thus protecting the sensitive magnetic components from dirt particles
2Manufacturing precision
If a very thin separating layer is used to reduce lateral forces between armature and pole tube, then control quality improves, but the layer becomes sensitive to contamination and manufacturing variations
Solution Approach 1:
The separation between magnetic and hydraulic parts is achieved through a distinct sealing element rather than a thin coating or plating layer. This segmentation allows the armature to run in the pole tube with minimal lateral forces while the sealing element provides robust protection against contamination
Solution Approach 2:
The sealing element serves as an intermediary that eliminates the need for very thin separating layers. It provides a reliable barrier that is not susceptible to the same contamination and manufacturing variation issues that affect thin chemical or galvanic coatings
3Device complexity
If the magnetic and hydraulic parts are directly connected to allow fluid exchange, then the system remains simple, but dirt particles can impair both magnetic and hydraulic functions
Solution Approach 1:
The direct connection between magnetic and hydraulic parts is replaced by a segmented design with a sealing element in between. This segmentation prevents dirt particle exchange while maintaining a relatively simple overall structure
Solution Approach 2:
The sealing element acts as an intermediary barrier that prevents the exchange of contaminated medium between magnetic and hydraulic parts, thereby protecting both functions from impairment by dirt particles while still allowing the valve to operate effectively
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
Enhances the overall robustness and durability of the hydraulic valve by minimizing dirt entry into the magnetic part, reducing valve hysteresis and maintaining high control quality while allowing for efficient fluid exchange.
Implementation Method 1
an electromagnetic actuator (5) of the hydraulic valve, in particular of the magnetic part, having an armature (7) which can be moved in the longitudinal direction
Implementation Method 2
a sealing element for the spatial separation of the magnetic and hydraulic parts is arranged in the valve bushing, through which an end of the valve piston designed as a piston tappet projects without contact
Data Source
Figure 1
Figure 2~4
Figure 3
AI summary
The invention relates to a hydraulic valve (1, 100) with a valve bushing (2, 102) and a valve piston (3, 103) axially displaceable in the valve bushing (2, 102) along a longitudinal axis (4, 104) of the valve bushing (2, 102), with a supply port (P) for supplying a hydraulic fluid, at least one working port (A) and at least one tank outlet (T) for discharging the hydraulic fluid, wherein the valve piston (3, 103) is displaceable by means of an electromagnetic actuator (5, 105) of the hydraulic valve (1, 101) and the valve bushing forms a hydraulic part and the actuator a magnetic part of the hydraulic valve. According to the invention, a sealing element (37, 137) is arranged in the valve bushing (2, 102) for spatial separation of the magnetic and hydraulic parts, which is penetrated by an end of the valve piston (3, 103) designed as a piston tappet (39, 139).