OIL DRAIN PLUG

PROBLEM TO BE SOLVED: To efficiently adsorb and capture iron powder included in oil efficiently by a magnet while avoiding the magnet provided at a tip of an oil drain plug interfering with other members.SOLUTION: As at least one part of an iron powder adsorption surface 22c of a magnet 22 provided...

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Bibliographic Details
Main Authors INOUE NORIYUKI, INOMATA KOJI, SHUTO NORIMASA
Format Patent
LanguageEnglish
Japanese
Published 16.03.2015
Subjects
BLASTING
CRANKCASE VENTILATING
ENGINE PLANTS IN GENERAL
HEATING
LIGHTING
LUBRICATING INTERNAL COMBUSTION ENGINES
LUBRICATING OF MACHINES OR ENGINES IN GENERAL
MACHINES OR ENGINES IN GENERAL
MECHANICAL ENGINEERING
STEAM ENGINES
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To efficiently adsorb and capture iron powder included in oil efficiently by a magnet while avoiding the magnet provided at a tip of an oil drain plug interfering with other members.SOLUTION: As at least one part of an iron powder adsorption surface 22c of a magnet 22 provided at a tip of an oil drain plug 20 is configured by a three-dimensional convex surface, a sharp corner portion is prevented from being formed on the iron powder adsorption surface 22c and interference with other members is hard to occur, so that the magnet 22 can be enlarged as much as possible to increase an adsorption amount of the iron powder. Also, as a tip part of the iron powder adsorption surface 22c is configured by a sphere, magnetic flux density in a tip center portion of the iron powder adsorption surface 22c becomes the highest, and not only increase of the adsorption amount of the iron powder by adsorbing the iron powder on the whole iron powder adsorption surface 22c becomes possible but also a distance L2 from the portion where the magnetic flux density is the highest to a plug body 21 becomes larger than that of a conventional one. Thus, magnetic flux leakage to the plug body 21 decreases and adsorption efficiency of the iron powder improves. 【課題】 オイルドレンプラグの先端に高けたマグネットが他部材と干渉するのを回避しながら、マグネットでオイル中に含まれる鉄粉を効率的に吸着して捕捉する。【解決手段】 オイルドレンプラグ２０の先端に設けたマグネット２２の鉄粉吸着面２２ｃの少なくとも一部は三次元凸曲面で構成されるので、鉄粉吸着面２２ｃに尖った角部が形成されるのを防止して他部材と干渉し難くすることで、マグネット２２をできるだけ大型化して鉄粉の吸着量を増加することが可能になる。また鉄粉吸着面２２ｃの先端部は球面で構成されるので、鉄粉吸着面２２ｃの先端中心部の磁束密度が最も高くなり、鉄粉吸着面２２ｃの全体に鉄粉を吸着して鉄粉の吸着量を増加することが可能になるだけでなく、磁束密度が最も高い部分からプラグ本体２１までの距離Ｌ２が従来のものよりも大きくなることで、プラグ本体２１への磁束漏れが減少して鉄粉の吸着効率が向上する。【選択図】 図２
Bibliography:Application Number: JP20130178538