公开(公告)号：US20180156084A1

公开(公告)日：2018-06-07

申请号：US15813446

申请日：2017-11-15

Applicant: MAHLE FILTER SYSTEMS JAPAN CORPORATION

Inventor： Daizo ITO ,  Shin YOSHIDA ,  Atsushi NONAKA ,  Yuichi KATO

IPC: F01M11/04 ,  F16B33/00 ,  F16N31/00

CPC classification number: F01M11/0408 ,  B62D29/041 ,  F01M11/0458 ,  F01M2011/0416 ,  F16B33/006 ,  F16N31/00

Abstract: Disclosed is a structure for attachment of a drain nut to a synthetic resin cover. The cover has a nut engagement portion formed in an outer surface of the cover, a cylindrical engagement portion formed with a plurality of piece parts on an inner surface of the cover, and a stepped portion formed between the nut and cylindrical engagement portions. The drain nut has a nut portion engaged in the nut engagement portion, a female thread portion formed in the nut portion for screw-in of a drain plug, a cylindrical portion formed concentrically with the nut portion and engaged in the cylindrical engagement portion, a large-diameter portion formed between the nut and cylindrical portions and engaged in the stepped portion, with an O-ring held between the large-diameter portion and stepped portion, and a collar portion formed around the cylindrical portion and retained by front ends of the piece parts.