Separate Guide Valve Apparatus Deformation Control
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Solution Overview
Problem
Existing pressure reducing valves in common rail fuel injection systems face issues with deformation due to tightening loads and high temperature processing, leading to potential interference in slide movement and leakage, and increased flow resistance due to narrow slide clearances, which limits the movability of the armature and pushrod.
Innovation Solution
A valve apparatus with a slidably holding guide separate from the valve body, providing a clearance between the guide and the valve body to absorb deformation and maintain axial alignment, and a larger breathing passage to reduce flow resistance and improve movability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve body is strongly tightened to the common rail to prevent deformation, then the connection reliability is improved, but the valve body may still deform due to tightening loads and high temperature processing
Solution Approach 1:
The guide is separated from the valve body, forming an independent component. This segmentation allows the guide to maintain precise dimensions independently while the valve body absorbs deformation from tightening and thermal processing, preventing deformation transmission to critical functional surfaces.
Solution Approach 2:
The guide acts as an intermediary component between the valve body and the pushrod. It receives the pushrod and provides precise guidance while being positioned at a location that isolates it from the deformation-prone valve body, thereby mediating the mechanical connection without transmitting deformation.
2Device complexity
If the slide hole is directly formed in the valve body, then the structure is simplified, but the slide hole deforms when the valve body deforms causing interference in pushrod movement
Solution Approach 1:
The guide is separated from the valve body, forming an independent component. This segmentation allows the guide to maintain precise dimensions independently while the valve body absorbs deformation from tightening and thermal processing, preventing deformation transmission to critical functional surfaces.
Solution Approach 2:
The guide containing the slide hole is extracted from the valve body as a separate component. This extraction removes the slide hole from the deformation-prone valve body, ensuring that pushrod movement is not interfered with by valve body deformation while maintaining structural simplicity through modular design.
3Manufacturing precision
If the slide clearance is made narrow to limit pushrod deviation, then the alignment precision is improved, but the flow resistance increases and movability of armature and pushrod is limited
Solution Approach 1:
The guide is positioned in a different spatial dimension relative to the valve body, creating a clearance between them. This dimensional arrangement allows the slide clearance to be sufficiently large for smooth pushrod movement and armature responsiveness, while the guide's positioning maintains alignment precision without requiring narrow clearances.
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 solution effectively limits deformation-related issues in slide movement, maintains proper alignment, and enhances the responsiveness of the pressure reducing valve by reducing flow resistance and improving the movability of the armature and pushrod, thereby preventing leakage and maintaining efficient operation.
Implementation Method 1
The solenoid 146 magnetically attracts the armature 143 upon receiving electric power through the connector 147
Implementation Method 2
The spring 141 urges the armature 143 and the pushrod 122 in the downward direction (a valve closing direction)
Implementation Method 3
a ball 123, which receives the axial drive force of the pushrod 122
Data Source
AI summary
A pushrod is slidably received in a slidably holding guide, which is formed separately from a valve body of a valve apparatus. A clearance is provided between an inner peripheral surface of a small diameter tube portion of the valve body and an outer peripheral surface of the guide. The clearance is provided to absorb deformation of the small diameter tube portion.