Pneumatic Valve Slide Adjusting Axial Tolerance
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Solution Overview
Problem
Pneumatic valves of the slide type for commercial vehicles face challenges in manufacturing and assembly due to tolerance issues, which affect the axial position and preload of control edge units, leading to variability in valve characteristics, potential functional impairments, and increased manufacturing costs.
Innovation Solution
An adjustable adjusting element is used to compensate for tolerances by allowing adjustment of the axial position and preload of control edge units and spacer elements, with a securing element to maintain the desired position, reducing manufacturing and assembly efforts and enhancing operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If control edge units are used with predetermined axial positions via spacer elements, then assembly is simplified, but tolerance variations lead to changes in preload and functional impairments
Solution Approach 1:
The patent introduces an adjustable element that enables dynamic adjustment of the axial position of control edge units after assembly. This allows the system to adapt to tolerance variations and maintain proper preload, resolving the contradiction between simplified assembly and functional reliability by making the previously static position adjustable.
Solution Approach 2:
The invention allows changing the axial position parameter of control edge units through the adjustable element. By enabling parameter adjustment after assembly, the system can compensate for tolerance variations in spacer elements and maintain optimal preload conditions, thus ensuring functional reliability while keeping assembly simple.
2Manufacturing precision
If tolerance specifications are tightened to ensure consistent axial positioning, then valve characteristics become more consistent, but manufacturing costs and complexity increase
Solution Approach 1:
The adjustable element enables operators to self-correct position deviations during assembly or maintenance without requiring tight manufacturing tolerances. The system provides its own adjustment capability, eliminating the need for complex tolerance control measures and reducing manufacturing precision requirements while maintaining consistent valve characteristics.
3Ease of manufacture
If multiple control edge units are assembled in sequence with intermediate spacers, then valve chambers are properly formed, but cumulative tolerance errors affect axial positioning
Solution Approach 1:
The adjustable element introduces a dynamic correction capability that compensates for cumulative tolerance errors from multiple spacer elements. By allowing post-assembly adjustment of control edge unit positions, the system maintains the benefits of modular assembly while eliminating the precision loss from cumulative tolerances.
Solution Approach 2:
The adjustable element provides a feedback mechanism where the actual position of control edge units can be observed and corrected. This allows operators to detect and compensate for cumulative tolerance errors, ensuring accurate axial positioning despite the use of multiple intermediate spacers in the modular assembly process.
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 solution ensures precise axial positioning and prestressing of control edge units, improving the reliability and fatigue strength of the pneumatic valve, reducing manufacturing costs, and maintaining operational safety even under varying operational conditions.
Implementation Method 1
durch eine axiale Vorspannung des Dichtelements zwischen den beiden Stützringscheiben, dass das Dichtelement radially auf der Innenseite mit Abdichtung an der Mantelfläche des Ventilschiebers aufliegt
Implementation Method 2
mit einer auf das Steuerkanteneinheit und auf das Abstandselement wirkenden Vorspannkraft des in der Ausnehmung des Gehäuses angeordneten Federelements
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The pneumatic valve (1) has a valve slide portion (31) that is displaced in axial direction of recess (9) formed in housing (3). The outer surface (34) of valve slide portion is sealed corresponding to axial positions of valve slide portion adjacent to valve chambers (39,40) by using a bypass portion (37). The axial position of a spacer element (20) is set based on control edges (25b-25d) of sealing elements (21b-21d) inserted into recess. The axial positions of control edges, spacer element and/or a bias unit are adjusted by the operation of a screw (23). An independent claim is included for a method for assembling slide type pneumatic valve.