Electromagnetic Actuator Sealing Structure Against Plunger Jamming
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Solution Overview
Problem
Conventional electromagnetic actuators face issues with foreign matter entering the movement space of the plunger and shaft pin, leading to jamming and malfunction due to the press-fitting of core parts into a collar, which can introduce dust and shavings into the reciprocating mechanism.
Innovation Solution
The electromagnetic actuator design incorporates a stator with an annular groove and protrusion for positioning, along with annular seal members to prevent foreign matter entry, and a bobbin with through holes and positioning parts to facilitate smooth assembly and operation, reducing the risk of jamming and ensuring smooth movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the first core part and the second core part are press-fitted into the collar for positioning, then the positioning accuracy is improved, but foreign matter such as dust and shavings may enter the movement space of the plunger and shaft pin causing jamming
Solution Approach 1:
The collar is divided into two separate parts: a positioning collar for accurate positioning and a protective collar for sealing. This segmentation allows the positioning function to be separated from the sealing function, enabling both accurate positioning and protection against foreign matter entry.
Solution Approach 2:
A seal member is introduced as an intermediary element between the collar and the bobbin. This seal member prevents foreign matter from entering the movement space while allowing the press-fitting operation to proceed for accurate positioning. The seal member acts as a barrier that mediates between the positioning requirement and the contamination risk.
2Device complexity
If the seal members are only interposed between the bobbin and the case, then the structure is simple, but foreign matter can still enter through the gap between the collar and bobbin
Solution Approach 1:
The sealing system is segmented into multiple locations: seal members are placed both between the bobbin and case, and between the collar and bobbin. This multi-location segmentation ensures comprehensive sealing coverage without requiring a complex single sealing mechanism.
Solution Approach 2:
The collar is designed with a built-in sealing structure that preliminarily prevents foreign matter entry before the plunger and shaft pin movement. The seal member is pre-positioned in the collar structure, creating a barrier against foreign matter before it can contaminate the movement space.
3Ease of manufacture
If the outer wall surfaces of the core parts are inserted while pressing the inner wall surface of the collar, then the assembly is easy to manufacture, but shavings from scraping may cause jamming
Solution Approach 1:
The seal member serves as a protective intermediary during the press-fitting assembly process. It is positioned to intercept and contain any shavings generated during scraping, preventing them from entering the movement space. This allows the simple press-fitting method to be used without the harmful effect of shavings causing jamming.
Solution Approach 2:
The potential harmful effect of scraping during press-fitting is converted into a beneficial sealing action. The seal member, which would normally just be a passive barrier, becomes actively engaged during the press-fitting process to contain and manage the shavings, transforming the harmful scraping action into a controlled process that doesn't compromise reliability.
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 configuration simplifies the structure, reduces costs, and prevents foreign matter entry, ensuring reliable and smooth operation of the mover by positioning the stator accurately and sealing the assembly effectively.
Implementation Method 1
a coil for excitation, wound around the bobbin
Implementation Method 2
an electromagnetic actuator using electromagnetic force of a solenoid as a driving force
Data Source
AI summary
An electromagnetic actuator includes: a mover, reciprocating along an axis line; a stator, accommodating the mover to be capable of reciprocating; a bobbin, arranged around the stator and around which a coil for excitation is wound; and a first annular seal member, interposed between the bobbin and the stator. The bobbin includes a through hole through which the stator passes, and a protrusion formed protruding from an inner wall surface near an end opening of the through hole. The stator includes an outer peripheral surface that is formed to be insertable into the through hole without contacting the inner wall surface and the protrusion and faces the inner wall surface in an area deviated from the protrusion, and an outer peripheral fitting part fitted into the protrusion. The first annular seal member is arranged in an area of the outer peripheral surface within the through hole.