Rotary seal

Patent metadata

Field	Value
Publication number	US-2018347632-A1
Application number	US-201815992872-A
Country	US
Kind code	A1
Filing date	May 30, 2018
Priority date	May 31, 2017
Publication date	Dec 6, 2018
Grant date	—

Abstract

There is provided a rotary seal capable of delaying a progress of corrosion of a steel-made member without increasing manufacturing cost even when a solution containing an electrolyte is present around a contact portion between a stainless steel-made member and the steel-made member. At least one of (i) a metal fitting portion A between a sleeve 2 A of a stainless steel-made slinger 2 of a rotary seal 1 A and an inner ring 12 that is a steel-made radially inner member, and (ii) an outside-air side surface of the slinger 2 , which includes an outside-air side end portion of the fitting portion A, is provided with at least one of a silane-based adhesive layer containing powder of metal having a higher ionization tendency than iron, a thermosetting resin adhesive layer containing powder of metal having a higher ionization tendency than iron, and a coating film containing powder of metal having a higher ionization tendency than iron.

First claim

What is claimed is:

1 . A rotary seal comprising:
a stainless steel-made slinger including a cylindrical sleeve and a flange extending radially outward from one end in an axial direction of the sleeve; a core metal including a core metal cylinder that is cylindrical and a core metal flange extending radially inward from one end in an axial direction of the core metal cylinder; and a seal member including a base portion joined to the core metal and a seal lip portion extending from the base portion, wherein the rotary seal is used in a state where the sleeve is attached to a steel-made radially inner member and the core metal cylinder is attached to a steel-made radially outer member, and at least one of (i) a metal fitting portion between the sleeve and the radially inner member, and (ii) an outside-air side surface of the slinger including an outside-air side end portion of the metal fitting portion, is provided with at least one of a silane-based adhesive layer containing powder of metal having a higher ionization tendency than iron, a thermosetting resin adhesive layer containing powder of metal having a higher ionization tendency than iron, and a coating film containing powder of metal having a higher ionization tendency than iron.

2 . The rotary seal according to claim 1 , wherein
the core metal is made of stainless steel, and at least one of (i) a metal fitting portion between the core metal cylinder and the radially outer member, and (ii) an outside-air side surface of the core metal including an outside-air side end portion of the fitting portion, is provided with at least one of the silane-based adhesive layer containing powder of metal having a higher ionization tendency than iron, the thermosetting resin adhesive layer containing powder of metal having a higher ionization tendency than iron, and the coating film containing powder of metal having a higher ionization tendency than iron.

3 . A rotary seal comprising:
a stainless steel-made core metal including a core metal cylinder that is cylindrical and a core metal flange extending radially inward or outward from one end in an axial direction of the core metal cylinder; and a seal member including a base portion joined to the core metal and a seal lip portion extending from the base portion, wherein the rotary seal is used in a state where the core metal cylinder is attached to a steel-made radially outer member or a steel-made radially inner member, and at least one of (i) a metal fitting portion between the core metal cylinder and the radially outer member or between the core metal cylinder and the radially inner member, and (ii) an outside-air side surface of the core metal including an outside-air side end portion of the metal fitting portion, is provided with at least one of a silane-based adhesive layer containing powder of metal having a higher ionization tendency than iron, a thermosetting resin adhesive layer containing powder of metal having a higher ionization tendency than iron, and a coating film containing powder of metal having a higher ionization tendency than iron.

4 . The rotary seal according to claim 1 , wherein the metal having a higher ionization tendency than the iron is zinc, aluminum, or magnesium, and each of the silane-based adhesive layer, the thermosetting resin adhesive layer, and the coating film contains one kind or a plurality of kinds of powders of the zinc, the aluminum, and the magnesium.

5 . The rotary seal according to claim 4 , wherein each of the silane-based adhesive layer, the thermosetting resin adhesive layer, and the coating film contains the powder of the metal having a higher ionization tendency than the iron, a content of the powder when dried being 75% by weight or more and 98% by weight or less.

Assignees

• Nakanishi Metal Works Co

Inventors

• Sato Takahiko
• Akashi Shinichi
• Iizawa Yusuke

Classifications

• F16C33/7826

  of the opposing surface cooperating with the seal, e.g. a shoulder surface of a bearing ring · CPC title

• F16J15/3264

  the elements being separable from each other · CPC title

• F16C33/782

  of the sealing region · CPC title

• F16C33/7879

  with a further sealing ring · CPC title

• F16C33/783 Primary

  of the mounting region · CPC title