Spherical annular seal member and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-10184384-B2
Application number	US-201113878527-A
Country	US
Kind code	B2
Filing date	Oct 12, 2011
Priority date	Oct 19, 2010
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

In a spherical annular seal member 38, a spherical annular base member 36 is constructed so as to be provided with structural integrity as a heat-resistant material 6 and a reinforcing member 5 are compressed to each other and intertwined with each other. In an outer layer 37, the heat-resistant material 6, a sintered solid lubricant constituted by a lubricating composition, and the reinforcing member 5 made from a metal wire net are compressed such that the sintered solid lubricant and the heat-resistant material 6 are filled in meshes of the metal wire net of the reinforcing member 5, and the solid lubricant, the heat-resistant material 6, and the reinforcing member 5 are integrated in mixed form, an outer surface 39 of that outer layer 37 being thus formed into a smooth surface 42 in which a surface 40 constituted by the reinforcing member 5 and a surface 41 constituted by the sintered solid lubricant are present in mixed form.

First claim

The invention claimed is:

1. A spherical annular seal member for use in an exhaust pipe joint, comprising: a spherical annular base member defined by a cylindrical inner surface, a partially convex spherical surface, and large- and small-diameter side annular end faces of said partially convex spherical surface; and an outer layer formed integrally on said partially convex spherical surface of said spherical annular base member,
wherein said spherical annular base member includes a first reinforcing member made from a metal wire net and a first heat-resistant material containing expanded graphite and compressed in such a manner as to fill meshes of the metal wire net of said first reinforcing member and to be integrated with said first reinforcing member in mixed form,
wherein, in said outer layer, a second heat-resistant material containing expanded graphite, a sintered solid lubricant of a lubricating composition, and a second reinforcing member made from a metal wire net are compressed such that said solid lubricant and said second heat-resistant material are filled in meshes of said second reinforcing member, and such that said solid lubricant, said second heat-resistant material, and said second reinforcing member are integrated in mixed form, an outer surface of said outer layer being formed into a smooth surface in which a surface constituted by said second reinforcing member and a surface constituted by said solid lubricant are present in mixed form,
wherein said lubricating composition consists of 45% by mass of hexagonal boron nitride and 55% by mass of a tetrafluoroethylene-hexafluoropropylene copolymer (FEP),
wherein each of said first heat-resistant material and said second heat-resistant material contains an aluminum primary phosphate at a ratio of 4 to 8% by mass, and
wherein each of said first heat-resistant material and said second heat-resistant material contains phosphorus pentoxide at a ratio of 0.05 to 5% by mass.

2. A spherical annular seal member for use in an exhaust pipe joint, comprising:
a spherical annular base member defined by a cylindrical inner surface, a partially convex spherical surface, and large- and small-diameter side annular end faces of said partially convex spherical surface; and
an outer layer formed integrally on said partially convex spherical surface of said spherical annular base member,
wherein said spherical annular base member includes a first reinforcing member made from a metal wire net and a first heat-resistant material containing expanded graphite and compressed in such a manner as to fill meshes of the metal wire net of said first reinforcing member and to be integrated with said first reinforcing member in mixed form,
wherein, in said outer layer, a second heat-resistant material containing expanded graphite, a sintered solid lubricant of a lubricating composition, and a second reinforcing member made from a metal wire net are compressed such that said solid lubricant and said second heat-resistant material are filled in meshes of said second reinforcing member, and such that said solid lubricant, said second heat-resistant material, and said second reinforcing member are integrated in mixed form, an outer surface of said outer layer being formed into a smooth surface in which a surface constituted by said second reinforcing member and a surface constituted by said solid lubricant are present in mixed form,
wherein said lubricating composition consists of 41 to 45% by mass of hexagonal boron nitride, 50 to 55% by mass of a tetrafluoroethylene-hexafluoropropylene copolymer (FEP) and not more than 9% by mass of graphite,
wherein each of said first heat-resistant material and said second heat-resistant material contains an aluminum primary phosphate at a ratio of 4 to 8% by mass, and
wherein each of said first heat-resistant material and said second heat-resistant material further contains phosphorus pentoxide at a ratio of 0.05 to 5% by mass.

3. A spherical annular seal member for use in an exhaust pipe joint, comprising:
a spherical annular base member defined by a cylindrical inner surface, a partially convex spherical surface, and large- and small-diameter side annular end faces of said partially convex spherical surface; and
an outer layer formed integrally on said partially convex spherical surface of said spherical annular base member,
wherein said spherical annular base member includes a first reinforcing member made from a metal wire net and a first heat-resistant material containing expanded graphite and compressed in such a manner as to fill meshes of the metal wire net of said first reinforcing member and to be integrated with said first reinforcing member in mixed form,
wherein, in said outer layer, a second heat-resistant material containing expanded graphite, a sintered solid lubricant of a lubricating composition, and a second reinforcing member made from a metal wire net are compressed such that said solid lubricant and said second heat-resistant material are filled in meshes of said second reinforcing member, and such that said solid lubricant, said second heat-resistant material, and said second reinforcing member are integrated in mixed form, an outer surface of said outer layer being formed into a smooth surface in which a surface constituted by said second reinforcing member and a surface constituted by said solid lubricant are present in mixed form,
wherein said lubricating composition consists of 23 to 75% by mass of hexagonal boron nitride, 23 to 75% by mass of molten fluorocarbon resin and not more than 16% by mass of graphite, and
wherein either one of a tetrafluoroethylene-hexafluoropropylene copolymer (FEP) and a tetrafluoroethylene-perfluoroalkylvinylether copolymer (PFA) is used as said molten fluorocarbon resin in said lubricating composition.

4. The spherical annular seal member according to claim 3 , wherein each of said first heat-resistant material and said second heat-resistant material contains a phosphate at a ratio of 0.1 to 16% by mass.

5. The spherical annular seal member according to claim 3 , wherein each of said first heat-resistant material and said second heat-resistant material further contains phosphorus pentoxide at a ratio of 0.05 to 5% by mass.

6. A spherical annular seal member for use in an exhaust pipe joint, comprising:
a spherical annular base member defined by a cylindrical inner surface, a partially convex spherical surface, and large- and small-diameter side annular end faces of said partially convex spherical surface; and
an outer layer formed integrally on said partially convex spherical surface of said spherical annular base member,
wherein said spherical annular base member includes a first reinforcing member made from a metal wire net and a first heat-resistant material containing expanded graphite and compressed in such a manner as to fill meshes of the metal wire net of said first reinforcing member and to be integrated with said first reinforcing member in mixed form,
wherein, in said outer layer, a second heat-resistant material containing expanded graphite, a sintered solid lubricant of a lubricating composition, and a second reinforcing member made from a metal wire net are compressed such that said solid lubricant and said second heat-resistant material are filled in meshes of said second reinforcing member, and such that said solid lubricant, said second heat-resistant material, and said second reinforcing member are integrated in mixed form, an outer surface of said outer layer being formed into a smooth surface in which a surface constituted by said second reinforcing member and a surface constituted by said solid lubricant are present in mixed form,
wherein said lubricating composition consists of 23 to 75% by mass of hexagonal boron nitride and 23 to 75% by

Assignees

• Kaida Hidetoshi
• Kurose Kouhei
• Oiles Industry Co Ltd

Inventors

• Kaida Hidetoshi
• Kurose Kouhei

Classifications

• F16J15/121

  with metal reinforcement · CPC title

• F01N2530/00

  Selection of materials for tubes, chambers or housings · CPC title

• F01N2310/14

  Wire mesh fabric, woven glass cloth or the like · CPC title

• F01N13/1827 Primary

  Sealings specially adapted for exhaust systems (sealings in general F16J15/00) · CPC title

• F01N13/1811

  with means permitting relative movement, e.g. compensation of thermal expansion or vibration · CPC title