Electromagnetic Valve Mounting Structure for Vibration Suppression
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Solution Overview
Problem
Conventional mounting structures for electromagnetic valves on intake manifolds face issues with increased part count, reduced grommet effectiveness due to thickness constraints, and potential deformation leading to vibration propagation and durability problems.
Innovation Solution
A resilient mounting structure using an O-ring and a grommet with depressions and projections to reduce abrasion force and maintain compression, eliminating the need for a metallic sleeve, which allows for stable vibration suppression without increasing the number of parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metallic sleeve is disposed in the grommet hole to prevent direct contact between the grommet and bolt, then the grommet is protected from abrasion and deformation, but the number of parts increases and the grommet thickness in the radial direction must be reduced
Solution Approach 1:
The patent introduces a metallic insert as an intermediary component disposed within the grommet hole. This insert serves as a mediator between the grommet and the bolt, preventing direct contact and abrasion while allowing the grommet to maintain sufficient thickness for effective vibration suppression. The insert is retained by the grommet's inner wall structure, eliminating the need for additional fastening parts.
2Volume of moving object
If the grommet thickness is reduced to accommodate a metallic sleeve, then the mounting space on the intake manifold is efficiently utilized, but the effectiveness of the grommet in suppressing vibration is reduced
Solution Approach 1:
The patent segments the mounting structure into distinct functional zones: the metallic insert handles the fastening and abrasion-resistant functions, while the grommet maintains sufficient radial thickness dedicated solely to vibration suppression. This segmentation allows each component to optimize its thickness independently, with the grommet retaining adequate material for effective vibration damping without being constrained by the need to accommodate the metallic sleeve.
3Stability of the object's composition
If the supporting position is placed close to the gravity center of the electromagnetic valve, then the electromagnetic valve is stable against vibration, but the shape of the intake manifold becomes complex
Solution Approach 1:
The patent uses a standardized bolt connection structure that can be replicated at different locations on the intake manifold. Rather than designing a complex integrated support structure, the solution copies the proven grommet-bolt mounting pattern to appropriate locations, maintaining simplicity in the intake manifold design while achieving stable electromagnetic valve mounting through proper positioning.
4Device complexity
If the rod portion of the bolt directly contacts the inner wall of the grommet hole without a metallic sleeve, then the number of parts is reduced, but the grommet is deformed by abrasion force during bolt installation
Solution Approach 1:
The metallic insert acts as an intermediary protective layer between the bolt's rod portion and the grommet's inner wall. During bolt installation, the insert absorbs the abrasion forces that would otherwise deform the grommet, preventing manufacturing defects while eliminating the need for a separate metallic sleeve component.
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 suppresses vibration, maintains the electromagnetic valve's upright posture, and enhances durability by minimizing grommet deformation, while reducing manufacturing costs and maintaining effective vibration absorption.
Implementation Method 1
a resilient member such as a grommet made of resin is coupled to a stay connected to a main body of the electromagnetic valve... The grommet disposed between the bolt and the electromagnetic valve suppresses propagation of vibration between the intake manifold and the electromagnetic valve
Implementation Method 2
Depressions and projections are formed on the inner surface of the grommet hole to reduce a contacting area between the rod portion of the bolt and the grommet hole and to reduce rotational torque transfer from the rod portion to the grommet hole
Data Source
AI summary
An object such as an electromagnetic valve is resiliently mounted (or in a floating manner) on a mounting base such as an intake manifold of an internal combustion engine. A valve port of the electromagnetic valve is connected to a connecting hole of the intake manifold via an O-ring, and a stay connected to the electromagnetic valve is coupled to a bolt via a resilient member such as a grommet. The bolt is rotated to be fastened to the intake manifold by screwing. A rod portion of the bolt is inserted into a hole of the grommet. Projections and depressions such as grooves extending along the rotational direction of the rod portion are formed on the inner surface of the grommet hole to reduce a contacting area and abrasion force between the grommet and the rod portion. In this manner, deformation of the grommet caused by rotation of the rod portion is suppressed.