SEALING MECHANISM As for the contact portion of the seal and bushing the wear groove advances with the following mechanism. Sealing film When parts are new Shallow sealing groove Sealing groove Sealing groove is transferred is formed is larger toward the bore The contact portion of the seal and bushing gradually move inside while forming the seal groove as shown in the picture above. The sealing film becomes possible only by the seal part without damage that are formed inside this seal groove with bushing surface finished precisely. The oil film is only formed during oil is supplied normally.
The contact surface of seal and bushing are damage once sealed oil is leaked and it becomes dry internally with some causes, and oil film is not formed even if oil is refilled again. If dirt, sand etc. enter the sealing areas, the surfaces of seals and bushing will be easily impaired with dirt, sand etc. thereby deteriorating the sealing function. OK NG Seal surface These areas must be free of flaws Sealing surfaces are easily impaired - 5 - Sealing film Sealing film Sealing film