JP6337462B2 - Ball-shaped seal - Google Patents

Description

  The present invention relates to a ball-shaped seal body used for a spherical pipe joint of an automobile exhaust pipe.

  In FIG. 42, which shows an example of the exhaust system of the automobile engine, the exhaust gas of the automobile engine is collected in the exhaust manifold catalytic converter 600 in the exhaust cylinder catalytic converter 600, and the exhaust pipe 601 and the exhaust pipe 601 The exhaust gas sent to the sub-muffler 603 through the exhaust pipe 602 and passed through the sub-muffler 603 is further sent to the muffler (silencer) 606 through the exhaust pipe 604 and the exhaust pipe 605, and is released into the atmosphere through the muffler 606. .

  These exhaust pipes 601 and 602, 604 and 605, and exhaust system members such as the sub-muffler 603 and muffler 606 are repeatedly subjected to stress due to the roll behavior and vibration of the engine, particularly in the case of a high-power engine at high speed rotation. The stress applied to the exhaust system member is considerably large. Therefore, there is a possibility of causing fatigue failure of the exhaust system member, and engine vibration may cause the exhaust system member to resonate and deteriorate indoor silence. In order to solve such a problem, the exhaust manifold catalytic converter 600 By connecting the connecting portion 607 between the exhaust pipe 601 and the connecting portion 608 between the exhaust pipe 604 and the exhaust pipe 605 by a vibration absorbing mechanism such as an exhaust pipe spherical joint or a bellows type joint, the roll behavior and vibration of the automobile engine are obtained. The stress that is repeatedly applied to the exhaust system member due to the above is absorbed, the fatigue failure of the exhaust system member is prevented, and the problem that the vibration of the engine causes the exhaust system member to resonate and deteriorates the quietness in the passenger compartment. Has the advantage.

JP 54-76759 A JP-A-58-34230 JP-A-6-123362

  The sealing body used in the exhaust pipe joint described in Patent Document 1 as an example of the vibration absorbing mechanism can reduce the manufacturing cost as compared with the bellows-type joint, and has an advantage of excellent durability. However, this sealing body is formed by compressing a heat-resistant material made of expanded graphite and a wire mesh as a reinforcing material, filling the mesh of the wire mesh with the heat-resistant material, and integrating the heat-resistant material and the wire mesh together. In addition to the problem of exhaust gas leakage through the seal body itself due to the ratio of the wire mesh to the heat-resistant material, the degree of compression of the heat-resistant material and the wire mesh, etc., a partially convex spherical surface that slidably contacts the counterpart material There is a problem of the occurrence of abnormal frictional noise due to the presence of heat-resistant materials on the surface of the metal.For example, if the ratio of the wire mesh to the heat-resistant material is large and the degree of pressurization to the heat-resistant material is low, Resistant to minute passages (gap) In addition to reducing the degree of sealing by the material and causing initial leakage, there is a risk of early exhaust gas leakage due to oxidation consumption of the heat-resistant material at high temperatures, and against the metal mesh on the partially convex spherical surface When the exposure ratio of the heat-resistant material is extremely large, there is a possibility that a stick-slip phenomenon is caused and abnormal frictional noise due to the stick-slip phenomenon is generated.

  The sliding surface (partially convex spherical surface) in the sealing body described in Patent Document 2 that solves the drawbacks of such a sealing body is a solid lubrication filled and held in the mesh of the deformed and entangled wire mesh and the mesh of the wire mesh. Due to the presence of the heat-resistant material on the partially convex spherical surface that is slidably in contact with the mating material of the sealing body described in Patent Document 1 Although having the advantage of avoiding the disadvantage of the occurrence of abnormal frictional noise as much as possible, the problem of exhaust gas leakage inherent in the sealing body is still not solved.

  In the sealing body described in Patent Document 3, as in the sealing body described in Patent Document 2, the partially convex spherical surface which is the sliding surface is filled and held in the mesh of the deformed and intertwined wire mesh and the wire mesh. Since the solid lubricant contains boron nitride in particular, it is formed on a smooth surface in which the solid lubricant is mixed and integrated. It has excellent dynamic characteristics and has the advantage that abnormal frictional noise does not occur when sliding against the mating material, but a minute rocking motion that occurs on the seal body, for example, when idling or waiting for a signal When excessive input in the axial direction is applied continuously for a long period of time, the metal mesh attacks the surface of the mating material due to sliding friction with the mating material, and induces abrasive friction to scrape the mating material surface. Damage like Roughened, fear and significantly reducing the sealing properties, abnormal frictional noise there is a fear of occurrence.

  As a result of intensive studies in view of the above circumstances, the present inventors focused on the partially convex spherical outer surface of the ball-shaped seal body that becomes a sliding friction surface with the counterpart material, and the wire mesh exposed on the partially convex spherical outer surface and the counterpart When the sliding friction surface with the concave spherical surface portion of the material was observed, the intersection of adjacent loops of the braided wire mesh forming the wire mesh became a large lump-like lump, which caused the mating material surface to slide against the mating material. The knowledge that it was damaged was obtained.

  The present invention has been made on the basis of the above knowledge, and the object of the present invention is to prevent damage to the mating material surface or roughening as much as possible in sliding friction with the mating material, An object of the present invention is to provide a spherical belt-like sealing body that can prevent the deterioration of sealing performance and the generation of abnormal frictional noise as much as possible.

  The spherical belt-like sealing body of the present invention used for an exhaust pipe joint has a cylindrical inner surface, a partially convex spherical outer surface, and annular end surfaces on the large diameter side and the small diameter side of the partially convex spherical outer surface. A plain weave wire mesh having a plurality of vertical lines and horizontal lines to form a plurality of layers between the partially convex spherical outer surface and the cylindrical inner surface and disposed between the partially convex spherical outer surface and the cylindrical inner surface; The plain weave wire mesh is filled with a heat-resistant material containing expanded graphite mixed and integrated with this plain weave wire mesh, and the partially convex spherical outer surface forms each mesh in the plain weave wire mesh forming the outermost layer Of a pair of diagonal lines located on one diagonal line of a pair of diagonal lines that connect the intersection points of adjacent vertical lines and adjacent horizontal lines, and the pair of diagonal lines Located on the other diagonal of And having a surface of the plain weave wire mesh comprising a surface consisting of the other intersection points arranged circumferentially with.

  According to the spherical belt-shaped sealing body of the present invention, one diagonal line of a pair of diagonal lines connecting the intersections of adjacent vertical lines and adjacent horizontal lines forming a rectangular mesh in a plain woven wire mesh forming the outermost layer. A plane consisting of one intersection point group located on the upper side and arranged in the axial direction, and a surface consisting of the other intersection point group located on the other diagonal line of the pair of diagonal lines and arranged in the circumferential direction Since the outer surface of the partially convex spherical surface is provided, the sliding friction with the counterpart material can eliminate the sliding with a large lump-like lump, and the abrasive wear between each intersection and the counterpart material surface can be eliminated. Induction can be reduced as much as possible, roughening due to damage on the surface of the counterpart material can be reduced to prevent deterioration of sealing performance, and a plain weave wire mesh forms multiple layers Because of the partial convex spherical outer surface wear sequentially Even if, the sliding between the such large lumps, such as lumps and the mating member surface is avoided, it is possible to prevent the generation of abnormal frictional noise as much as possible.

  In the spherical belt-shaped seal body of the present invention, the partially convex spherical outer surface may include a surface made of a heat-resistant material filled in the mesh of a plain weave wire mesh that forms the outermost layer. The convex spherical outer surface may be a smooth surface in which a surface made of a heat-resistant material and a surface of a plain woven wire mesh including a surface made of one and the other intersection group of the plain woven wire mesh are mixed. The body may further comprise a solid lubricant, in which case the partially convex spherical outer surface comprises a surface made of a solid lubricant filled in a plain weave wire mesh that forms the outermost layer. In such a case, the partially convex spherical outer surface may be a smooth surface in which a surface made of a solid lubricant and a surface of a plain weave wire mesh are mixed.

  When the partially convex spherical outer surface is a smooth surface in which the surface of the heat-resistant material and the surface of the plain weave wire mesh including the surface consisting of one and the other intersection group of the plain weave wire mesh are mixed, The mating material slides at least between the surface of the heat-resistant material and the surface of the plain-woven wire mesh including the intersection group of the plain-woven wire mesh, so that induction of abrasive wear and generation of abnormal frictional noise can be avoided, and the coating of the heat-resistant material Even if it is about to be excessively deposited on the surface of the mating material, only an appropriate film is deposited on the mating material surface due to the scraping action of the coating by the surface consisting of the intersection group of the plain weave wire mesh. Therefore, the generation of frictional noise can be prevented as much as possible due to the sliding friction through such an appropriate coating, and the partially convex spherical outer surface is a point of intersection between the surface of the solid lubricant and one and the other of the plain weave wire mesh. Including plain weave wire mesh In addition to the above, in the ball-shaped seal body of the present invention, when it is a smooth surface, the mating material can reduce the initial frictional resistance by the surface of the solid lubricant and perform smooth sliding. Can do.

  In order to exert the above effect more, in the ball-shaped seal body of the present invention, the surface of the plain weave wire mesh including the surface formed by one and the other intersection group of the plain weave wire mesh on the partially convex spherical outer surface is a partially convex spherical shape. It is good to expose with the partially convex spherical outer surface with an area ratio of 10 to 60% with respect to the entire outer surface.

  When the surface of the plain woven wire mesh including the surface formed by one and the other intersection group of the plain woven wire mesh on the partially convex spherical outer surface has an area ratio of 10 to 60% with respect to the entire partially convex spherical outer surface, In this sliding friction, in addition to the above effects, the roughening due to the damage on the surface of the counterpart material can be further reduced to prevent the deterioration of the sealing performance as much as possible.

  In the spherical belt-shaped sealing body of the present invention, the annular end surface on the large diameter side may include a surface of a plain woven wire mesh and a surface made of a heat-resistant material containing expanded graphite and filled in the mesh of the plain woven wire mesh. In such a case, the annular end surface on the large diameter side may be a smooth surface in which the surface of expanded graphite and the surface composed of one and the other intersection group of the plain weave wire mesh are mixed. Further, the annular end surface on the large diameter side of the partially convex spherical outer surface is formed by an annular flat end surface portion connected to the annular edge on the large diameter side of the partially convex spherical outer surface by an annular large diameter edge, and an annular flat surface. An annular inner tapered surface portion connected to the annular small-diameter edge of the end surface portion with a large-diameter edge and an annular one-side edge of the cylindrical inner surface at the small-diameter edge may be provided. In such a case, in the insertion of the one end of the exhaust pipe into the through hole defined by the inner surface of the cylinder, it becomes a positioning guide part for the ball-shaped seal body with respect to the one end of the exhaust pipe, and the through hole in the one end of the exhaust pipe Improves the workability of insertion.

  When the large-diameter annular end surface is a smooth surface in which the surface of the heat-resistant material and the plane consisting of one and the other of the plain weave wire mesh are mixed, the annular end surface on the large-diameter side of the partially convex spherical outer surface Even if relative rotational sliding occurs with the flange member in the exhaust pipe joint in contact with the annular end surface, excessive transfer of the heat-resistant material to the surface of the flange member is avoided, and an appropriate heat-resistant material coating is provided. Can be formed on the surface of the flange member, and the relative rotational sliding between the annular end surface on the large diameter side and the flange member can be performed through the heat-resistant material coating properly transferred to the surface of the flange member. Since shifting to rotational sliding occurs, the stick-slip phenomenon does not occur, and no abnormal frictional noise is generated on the sliding surface between the flange member surface and the large-diameter annular end surface due to the stick-slip phenomenon.

  In the spherical belt-shaped sealing body of the present invention, the cylindrical inner surface may have a surface made only of a heat-resistant material containing expanded graphite. According to such a spherical belt-shaped sealing body, the spherical belt-shaped sealing body is an exhaust pipe. When fixed to the outer surface, the sealing performance of the contact surface between the inner surface of the cylinder and the outer surface of the exhaust pipe is enhanced by a heat-resistant material containing expanded graphite, so that leakage of exhaust gas from the contact surface can be prevented as much as possible. it can.

  In the spherical belt-shaped sealing body of the present invention, the inner surface of the cylinder includes a surface made of a plain weave wire mesh that forms the innermost layer, and a surface made of a heat-resistant material containing expanded graphite and filled in the mesh of the plain weave wire mesh. According to such a ball-shaped seal body, when the ball-shaped seal body is fitted and fixed to the outer surface of the exhaust pipe, the friction between the inner surface of the cylinder and the outer surface of the exhaust pipe is expanded on the inner surface of the cylinder. The surface is enhanced by the mixed surface of the heat-resistant material containing graphite and the plain woven wire mesh, and as a result, the ball-shaped seal body is firmly fixed to the outer surface of the exhaust pipe.

  In a preferred example of the spherical belt-shaped sealing body of the present invention, the solid lubricant is a tetrafluoroethylene resin (hereinafter abbreviated as PTFE), a tetrafluoroethylene-hexafluoropropylene copolymer (hereinafter abbreviated as FEP). ) And hexagonal boron nitride (hereinafter abbreviated as “h-BN”).

  The composition ratio of the solid lubricant of PTFE, FEP and h-BN is a composition point of PTFE 10 mass%, FEP 10 mass% and h-BN 80 mass% in the ternary composition diagram of PTFE, FEP and h-BN, PTFE 10 Composition point of mass%, FEP 45 mass% and h-BN 45 mass%, PTFE 45 mass%, FEP 45 mass% and h-BN 10 mass%, and composition point of PTFE 40 mass%, FEP 10 mass% and h-BN 50 mass% It may be within a numerical range corresponding to a region bounded by a quadrangle having a composition point as a vertex.

  According to a preferred example of the ball-shaped seal body of the present invention in which the composition ratio of the solid lubricant is in a numerical range corresponding to a region bounded by a quadrangle having four composition points as vertices in the ternary composition diagram There is no risk of damaging the mating material surface. In particular, since the solid lubricant contains h-BN in addition to PTFE and FEP having different melting points, self-excited vibration can be reduced and abnormal noise can be prevented. In addition, excellent slidability can be obtained in a high temperature region.

  That is, according to such an example, the FEP melts and softens, and elasticity is exhibited by its viscosity. On the other hand, in the use of the ball-shaped seal body in the temperature range where the PTFE does not melt and is in the solid state, the PTFE in the solid state This prevents the elasticity of the FEP, suppresses stick-slip in sliding with the mating material, and uses the ball-shaped seal body at a temperature higher than the temperature at which PTFE melts and softens and the elasticity develops due to its viscosity. Due to the melting, the viscosity is greatly reduced and the lubricity is increased, the elasticity due to the viscosity of PTFE is suppressed, and similarly, the stick-slip is suppressed in sliding with the counterpart material. The use of a ball-shaped seal body from a low temperature region where PTFE and FEP do not melt to a high temperature region where PTFE and FEP each melt, Self-excited vibration can be reduced by the effect and the occurrence of abnormal noise can be prevented, and the lubricity of PTFE, FEP and h-BN, particularly the high lubricity of h-BN at high temperatures. However, it can slide smoothly with the counterpart material with low frictional resistance, and can exhibit stable sealing characteristics in cooperation with expanded graphite and plain woven wire mesh.

  More preferably, the composition ratio of PTFE, FEP and h-BN in the solid lubricant is a composition point of PTFE 25% by mass, FEP 15% by mass and h-BN 60% by mass, PTFE 12% by mass, FEP28 in the ternary composition diagram. Composition point of mass% and h-BN 60 mass%, composition point of PTFE 10 mass%, FEP 40 mass% and h-BN 50 mass%, composition of PTFE 20 mass%, FEP 40 mass% and h-BN 40 mass%, PTFE 38 Numerical value corresponding to a region bounded by hexagons having apexes at composition points of mass%, FEP 22 mass% and h-BN 40 mass% and PTFE 35 mass%, FEP 15 mass% and h-BN 50 mass%. More preferably, PTFE 25% by mass, FEP 25% by mass and h-BN5 % By mass.

  In the present invention, the solid lubricant may contain 20% by mass or less of alumina hydrate, preferably 0.05 to 10% by mass, and more preferably 0.05 to 10% by mass. Such an alumina hydrate itself does not exhibit any lubricity, but improves the adherence of the solid lubricant on the partially convex spherical outer surface and forms a strong partially convex spherical outer surface. The effect of exerting the role of pulling out the lubricity of h-BN by promoting the slip between the layers of the h-BN plate-like crystal.

Alumina hydrate is a compound represented by the composition formula Al ₂ O ₃ .nH ₂ O (in the composition formula, 0 <n <3). In the composition formula, n is usually 0 (zero). The number is more than less than 3, preferably 0.5 to 2, and more preferably about 0.7 to 1.5. The alumina hydrate, for example, boehmite _{(Al 2} O 3 · _H 2 O) and diaspore _{(Al 2} O 3 · _H 2 O) alumina monohydrate such as (aluminum hydroxide oxide), gibbsite _(Al 2 O ₃ · _3H 2 O) and bayerite _{(Al 2 O 3 · 3H 2} O) alumina trihydrate, such as, such as pseudo-boehmite and the like, one of these at least are suitably used.

  In the present invention, the solid lubricant may not be fired, but may be fired at a temperature equal to or higher than the melting point of FEP.

  In a preferred example of the spherical belt-shaped sealing body of the present invention, the heat-resistant material contains compressed expanded graphite, and in addition to expanded graphite, phosphate 0.1 to 16.0 mass as an oxidation inhibitor. % Or phosphorus pentoxide 0.05 to 5% by weight or phosphate 0.1 to 16.0% by weight and phosphorus pentoxide 0.05 to 5.0% by weight.

  The heat-resistant material containing at least one of phosphate and phosphorus pentoxide as an oxidation inhibitor and expanded graphite can improve the heat resistance and oxidation consumption resistance of the ball-shaped seal body itself, and the ball-shaped seal body It can be used in the high temperature range.

  In the ball-shaped seal body of the present invention, in the plain woven wire mesh, the vertical and horizontal lines preferably have a wire diameter of 0.15 to 0.50 mm, more preferably 0.15 to 0.32 mm. The mesh width may be about 1.5 to 5.0 mm in length and about 1.5 to 5.0 mm in width, and such a plain woven wire mesh is formed in a lattice shape so as to form a large number of square meshes. It has a woven vertical line and a horizontal line, and is a parallelogram shape defined by a pair of parallel sides parallel to each other and a pair of inclined sides parallel to each other. The direction in which one group of intersections located on one of the pair of diagonal lines connecting the intersections in each mesh in the group of intersections between adjacent vertical lines and adjacent horizontal lines is orthogonal to the parallel sides. The other intersection group located on the other diagonal is parallel to the parallel side. Preferably used parallelogram plain weave wire mesh, which is arranged.

  In the present invention, in a plain woven wire mesh that is a layer subsequent to the outermost layer and that forms at least a layer adjacent to the outermost layer, a pair of diagonal lines connecting intersections of adjacent vertical lines and adjacent horizontal lines forming each mesh One intersection group located on one of the diagonal lines is arranged in the axial direction, and the other intersection group located on the other diagonal line of the pair of diagonal lines is arranged in the circumferential direction. If the plain weave wire mesh forming the layer adjacent to the outermost layer is like this, even if the outermost plain weave wire mesh on the partially convex spherical outer surface is worn, Since the transition is made to sliding, sliding between the large lumpy mass of the braided wire mesh and the surface of the mating material can be avoided, the occurrence of abnormal frictional noise can be prevented as much as possible, and the outermost layer can be In the plain weave wire mesh that forms the inner layer, each mesh is formed One intersection group located on one diagonal line of a pair of diagonal lines connecting the intersection points of adjacent vertical lines and adjacent horizontal lines is arranged in the axial direction, and the other of the pair of diagonal lines is The intersections of plain weaves located on the diagonal line may be arranged in the circumferential direction.In this case, even if the plain weave wire mesh of each layer is worn sequentially on the partially convex spherical outer surface, the plain weave of the next layer Since the transition to the sliding with the wire mesh is performed one after another, the smooth sliding between the plain weave wire mesh and the mating material surface can be maintained over a long period of time.

  According to the present invention, in the sliding friction with the counterpart material, the partially convex spherical outer surface can attack the counterpart material to reduce the induction of abrasive friction as much as possible, and the roughening caused by the damage of the counterpart material surface Thus, it is possible to provide a ball-shaped seal body that can prevent the deterioration of the sealing performance as much as possible and prevent the occurrence of abnormal frictional noise as much as possible.

FIG. 1 is a longitudinal sectional explanatory view of a preferred example of an embodiment of the present invention. FIG. 2 is a partially enlarged cross-sectional explanatory view of the example shown in FIG. FIG. 3 is an external explanatory view of the example shown in FIG. FIG. 4 is an explanatory view of a plain weave wire mesh in the manufacturing process of the example shown in FIG. 1, (a) is an explanatory plan view thereof, and (b) is an explanatory side view thereof. FIG. 5 is a plan view of a parallelogram plain weave wire mesh in the manufacturing process of the example shown in FIG. FIG. 6 is a perspective explanatory view of the expanded graphite sheet in the manufacturing process of the example shown in FIG. FIG. 7 is a perspective explanatory view of a polymerization sheet in the manufacturing process of the example shown in FIG. FIG. 8 is an explanatory side view of the polymerization sheet shown in FIG. FIG. 9 is an explanatory diagram of a method for forming a composite sheet in the manufacturing process of the example shown in FIG. FIG. 10 is a perspective explanatory view of the composite sheet in the manufacturing process of the example shown in FIG. FIG. 11 is an explanatory plan view of a cylindrical molded body in the manufacturing process of the example shown in FIG. FIG. 12 is a cross-sectional explanatory view taken along line XII-XII of the cylindrical molded body shown in FIG. FIG. 13 is an external explanatory view of the cylindrical molded body shown in FIG. FIG. 14 is a cross-sectional explanatory view of a mold in a state where a cylindrical molded body is inserted in the manufacturing process of the example shown in FIG. FIG. 15 is a cross-sectional explanatory view of a pressing punch fitted into the mold shown in FIG. FIG. 16 is a perspective explanatory view of a polymerization sheet in the production process of another preferred example of the embodiment of the present invention. FIG. 17 is a perspective explanatory view of a composite sheet in the manufacturing process of another preferred example of the embodiment of the present invention. FIG. 18 is an explanatory plan view of a cylindrical body in the manufacturing process of the example shown in FIG. FIG. 19 is a plan view of the cylindrical base material in the manufacturing process of the example shown in FIG. FIG. 20 is a perspective explanatory view of the polymerization sheet in the manufacturing process of the example shown in FIG. FIG. 21 is a plan view of the outer surface forming member in the manufacturing process of the example shown in FIG. FIG. 22 is an explanatory plan view of a composite cylindrical molded body in the manufacturing process of the example shown in FIG. FIG. 23 is an explanatory front view of the composite cylindrical molded body shown in FIG. 24 is an explanatory cross-sectional view showing a state where the composite cylindrical molded body shown in FIG. 23 is inserted into a mold. FIG. 25 is a perspective explanatory view of an expanded graphite sheet provided with a coating layer of a solid lubricant in the manufacturing process of an example of another embodiment of the present invention. FIG. 26 is an explanatory side view of the expanded graphite sheet shown in FIG. FIG. 27 is a perspective explanatory view of a polymerization sheet in the manufacturing process of the example shown in FIG. FIG. 28 is an explanatory plan view of the composite sheet in the manufacturing process of the example shown in FIG. FIG. 29 is an explanatory plan view of a cylindrical molded body in the manufacturing process of the example shown in FIG. FIG. 30 is a perspective explanatory view showing a production process of a polymer sheet in a production process of an example of another embodiment of the present invention. FIG. 31 is an explanatory plan view of the composite sheet in the manufacturing process of the example shown in FIG. FIG. 32 is an explanatory plan view of a cylindrical molded body in the manufacturing process of the example shown in FIG. FIG. 33 is an explanatory plan view of a cylindrical molded body in a manufacturing process of an example of another embodiment of the present invention. FIG. 34 is a cross-sectional explanatory view of an expanded graphite sheet provided with a coating layer of a solid lubricant in the manufacturing process of an example of another embodiment of the present invention. FIG. 35 is a perspective explanatory view of a polymerization sheet in the manufacturing process of the example shown in FIG. FIG. 36 is an explanatory plan view of the outer surface forming member in the manufacturing process of the example shown in FIG. 34. FIG. 37 is a partially enlarged cross-sectional explanatory view of a ball-shaped seal body manufactured in another example of the embodiment. FIG. 38 is a ternary composition explanatory diagram relating to the composition ratio of the solid lubricant in the ball-shaped seal body of the present invention. FIG. 39 is an explanatory plan view of a braided wire mesh in Comparative Example 1. FIG. 40 is an explanatory plan view of a plain weave wire mesh in Comparative Example 2. FIG. FIG. 41 is a longitudinal cross-sectional explanatory view of an exhaust pipe spherical joint incorporating a preferred example of the present invention. FIG. 42 is an explanatory diagram of an engine exhaust system.

  Next, the present invention and its embodiments will be described in more detail based on preferred embodiments shown in the drawings. In addition, this invention is not limited to these Examples at all.

  An example of the constituent material of the spherical belt-shaped sealing body and the method of manufacturing the spherical belt-shaped sealing body of the present invention will be described.

<About heat-resistant material I and its manufacturing method>
While stirring concentrated sulfuric acid having a concentration of 98%, a 60% aqueous solution of hydrogen peroxide as an oxidant is added to make a reaction solution. The reaction solution is cooled and maintained at a temperature of 10 ° C., and scale-like natural graphite powder having a particle size of 30 to 80 mesh is added to the reaction solution and reacted for 30 minutes. After the reaction, the acid-treated graphite powder is separated by suction filtration, and the washing process of stirring the acid-treated graphite powder with water for 10 minutes and suction-filtering is repeated twice to sufficiently remove the sulfuric acid content from the acid-treated graphite powder. . Next, the acid-treated graphite powder from which sulfuric acid has been sufficiently removed is dried in a drying furnace maintained at a temperature of 110 ° C. for 3 hours to obtain an acid-treated graphite powder.

  The acid-treated graphite powder is heated (expanded) at a temperature of 950 to 1200 ° C. for 1 to 10 seconds to generate decomposition gas, and expanded between graphite layers by the gas pressure (expansion magnification 240). ~ 300 times). The expanded graphite particles are supplied to a twin roller device adjusted to a desired roll gap and roll-formed to produce an expanded graphite sheet I having a desired thickness, and the heat-resistant material formed from the expanded graphite sheet I is used as a heat-resistant material. I.

<About heat-resistant material II and its manufacturing method>
A solution prepared by diluting an aqueous solution of primary aluminum phosphate [Al (H ₂ PO ₄ ) ₃ ] having a concentration of 50% as a phosphate salt with methanol into the acid-treated graphite powder obtained in the same manner as described above was added in a spray form. A mixture having wettability is prepared by stirring uniformly, and the mixture is dried for 2 hours in a drying oven maintained at a temperature of 120 ° C., and then expanded by the same method as described above to expand expanded graphite particles ( (Expansion magnification of 240 to 300 times). In this expansion treatment step, water in the structural formula is released from the primary aluminum phosphate. An expanded graphite sheet II is produced from the expanded graphite particles in the same manner as described above, and the heat-resistant material formed from the expanded graphite sheet II is referred to as a heat-resistant material II. .1 to 16% by mass.

In the heat-resistant material II containing phosphate in addition to expanded graphite, the heat resistance of expanded graphite itself is improved and an oxidation inhibiting action is imparted, so that it can be used in a high temperature range, for example, from 600 ° C to over 600 ° C. It becomes. As the phosphate, in addition to primary aluminum phosphate, secondary lithium phosphate (Li ₂ HPO ₄ ), primary calcium phosphate [Ca (H ₂ PO ₄ ) ₂ ], secondary calcium phosphate (CaHPO ₄ ), second Aluminum phosphate [Al ₂ (HPO ₄ ) ₃ ] can be used.

<About heat-resistant material III and its manufacturing method>
A solution obtained by diluting an acid-treated graphite powder obtained in the same manner as described above with a 50% aqueous solution of primary aluminum phosphate as phosphate and an aqueous solution of orthophosphoric acid (H ₃ PO ₄ ) as phosphoric acid with methanol as a spray is sprayed. And the mixture is uniformly stirred to prepare a wettable mixture. The mixture is dried in a drying oven maintained at a temperature of 120 ° C. for 2 hours, and then expanded in the same manner as described above. By processing, expanded graphite particles (expansion magnification of 240 to 300 times) are formed. In this expansion treatment step, water in the structural formula is eliminated with primary aluminum phosphate, and dehydration reaction occurs with orthophosphoric acid to produce phosphorus pentoxide. An expanded graphite sheet III is produced from the expanded graphite particles in the same manner as described above, and the heat-resistant material formed from the expanded graphite sheet III is referred to as a heat-resistant material III. 0.1-16 mass% and phosphorus pentoxide are contained in the ratio of 0.05-5 mass%.

In the heat-resistant material III containing phosphate and phosphorus pentoxide in addition to expanded graphite, the heat resistance of the expanded graphite itself is improved and an oxidation inhibiting action is imparted, so that, for example, in a high temperature region exceeding 600 ° C. to 600 ° C. Can be used. As phosphoric acid, in addition to orthophosphoric acid, metaphosphoric acid (HPO ₃ ), polyphosphoric acid, and the like can be used.

Each of the expanded graphite sheets I, II and III has a density of about 0.3 to 1.5 Mg / m ³ , a thickness of about 0.3 to 1.5 mm and a pair of parallel parallel to each other. It is good to form in the elongate parallelogram shape prescribed | regulated by the side and a pair of inclined side which inclines with respect to this pair of parallel side, and mutually parallel.

<About plain weave wire mesh as a reinforcing material>
Stainless steel wire such as austenitic SUS304, SUS310S, SUS316, ferritic SUS430, iron wire (JISG3532) or galvanized steel wire (JISG3547) or copper-nickel alloy (white copper) wire, copper-nickel -It consists of a zinc alloy (white and white) wire, a brass wire, and a beryllium copper wire, preferably a wire diameter of 0.15 to 0.50 mm, more preferably a wire diameter of 0.15 mm to 0.32 mm. A plurality of vertical lines using a thin metal wire and a plurality of horizontal lines are woven in a lattice pattern, and a rectangular mesh surrounded by adjacent vertical lines and adjacent horizontal lines, preferably vertical A plain woven wire mesh having a mesh width of about 1.5 to 5 mm in both width and width, and a pair of parallel sides parallel to each other and the pair of parallel sides A pair of crossing points at each mesh in a group of intersections of adjacent vertical lines and adjacent horizontal lines forming a rectangular mesh and having a parallelogram shape defined by a pair of inclined sides. One intersection point group located on one of the diagonal lines is arranged parallel to the parallel side, while the other intersection point group located on the other diagonal line is orthogonal to the parallel side. The long parallelogram shaped plain woven wire mesh arranged may be used for the plain woven wire mesh as a reinforcing material.

<About solid lubricant and coating layer>
The content ratio of PTFE, FEP and h-BN in the solid lubricant is preferably the content (mass%) of PTFE with the right side in FIG. 38 regarding the composition ratio (mass%) of PTFE, FEP and h-BN. In the ternary composition diagram of an equilateral triangle showing the content (mass%) of FEP at the bottom and the content (mass%) of h-BN at the left side, PTFE 10 mass%, FEP 10 mass% and h -Composition point A with BN 80% by mass, composition point B with PTFE 10% by mass, FEP 45% by mass and h-BN 45% by mass, composition point C with PTFE 45% by mass, FEP 45% by mass and h-BN 10% by mass and PTFE 40% by mass %, FEP 10% by mass and h-BN 50% by mass, the numerical value corresponding to the region P bounded by the square 80 with the composition point D at the apex More preferably, in the ternary composition diagram shown in FIG. 38, the composition point E, PTFE 12 mass%, FEP 28 mass%, and h-BN 60 mass are defined as PTFE 25 mass%, FEP 15 mass% and h-BN 60 mass%. Composition point F, PTFE 10 mass%, FEP 40 mass% and h-BN 50 mass% composition point G, PTFE 20 mass%, FEP 40 mass% and h-BN 40 mass% composition point H, PTFE 38 mass%, FEP22 Numerical value corresponding to the region Q bounded by the hexagon 81 with the composition point J as mass% and h-BN 40 mass% and the composition point K as PTFE 35 mass%, FEP 15 mass% and h-BN 50 mass%. Is in range.

  In the production process, the solid lubricant is PTFE powder having an average particle diameter of 0.01 to 1 μm, FEP powder having an average particle diameter of 0.01 to 1 μm, and h-BN powder having an average particle diameter of 0.1 to 20 μm. Is used in the form of an aqueous dispersion comprising a solid lubricant powder containing a surfactant, a surfactant and water.

  In the aqueous dispersion, the content ratio of PTFE powder, FEP powder and h-BN powder exhibiting excellent lubricity particularly in a high temperature region is preferably bounded by a square 80 in the ternary composition diagram shown in FIG. More preferably within a numerical range corresponding to the region within the region, more preferably within a numerical range corresponding to the region bounded by the hexagon 81 in the ternary composition diagram, and even more preferably, PTFE powder. 25% by mass, FEP powder 25% by mass and h-BN powder 50% by mass.

  An aqueous dispersion in which, for example, 4% by mass of a surfactant and 57% by mass of water are mixed with 39% by mass of the solid lubricant powder containing PTFE powder, FEP powder and h-BN powder having such a content ratio. However, the water content of the aqueous dispersion may be increased or decreased depending on the mode of application of the aqueous dispersion to the expanded graphite sheets I, II, and III by means of roller coating, brush coating, spraying, or the like. Also good.

  The surfactant contained in the aqueous dispersion may be any surfactant that can uniformly disperse the solid lubricant powder in water. Anionic surfactants, cationic surfactants, nonionic surfactants, amphoteric surfactants Any surfactant can be used. For example, anionic surface activity such as sodium alkyl sulfate, sodium alkyl ether sulfate, triethanolamine alkyl sulfate, triethanolamine alkyl ether sulfate, ammonium alkyl sulfate, ammonium alkyl ether sulfate, sodium alkyl ether phosphate, sodium fluoroalkylcarboxylate Agents; cationic surfactants such as alkyl ammonium salts and alkyl benzyl ammonium salts; addition of polyoxyethylene alkyl ether, polyoxyethylene phenyl ether, polyoxyethylene alkyl ester, propylene glycol-propylene oxide copolymer, perfluoroalkyl ethylene oxide Product, 2-ethylhexanol ethyleneoxy Nonionic surfactants such as adducts, alkyl betaine, alkyl amido betaines, and ampholytic surfactants such as imidazolium betaine. In particular, anionic and nonionic surfactants are preferred. A particularly preferable surfactant is a nonionic surfactant having an oxyethylene chain with a small amount of thermal decomposition.

  In the aqueous dispersion, the surfactant content is, for example, 4% by mass with respect to 39% by mass of the solid lubricant powder. If the surfactant content is too small, the dispersion of the solid lubricant powder is not achieved. If the surfactant is not uniform and the surfactant content is too high, the decomposition residue of the surfactant due to baking increases and coloring occurs, and the heat resistance and non-adhesiveness of the coating layer decrease.

  The solid lubricant powder replaces a part of the content of h-BN powder, and the alumina hydrate powder is in a proportion of 20% by mass or less, preferably 0.05 to 10% by mass, more preferably 0.05. You may contain in the ratio of -5 mass%.

  Aqueous dispersion containing PTFE powder, FEP powder, h-BN powder, surfactant and water or PTFE powder, FEP powder, h-BN powder, alumina hydrate powder, aqueous dispersion containing surfactant and water John may further contain a water-soluble organic solvent. Examples of the water-soluble organic solvent include alcohol solvents such as methanol, ethanol, butanol, isopropyl alcohol, and glycerin; ketone solvents such as acetone, methyl ethyl ketone, and methyl isobutyl ketone; ether solvents such as methyl cellosolve, cellosolve, and butyl cellosolve; Examples include glycol solvents such as ethylene glycol, propylene glycol, triethylene glycol, and tetraethylene glycol; amide solvents such as dimethylformamide and dimethylacetamide; and lactam solvents such as N-methyl-2-pyrrolidone. The content of the water-soluble organic solvent is 0.5 to 50% by mass, preferably 1 to 30% by mass, based on the total amount of water. The water-soluble organic solvent has a function of wetting the PTFE powder and the FEP powder, and forms a uniform mixture with the h-BN powder. The water-soluble organic solvent evaporates during drying and does not adversely affect the coating layer.

As an aqueous dispersion of solid lubricant powder,
(1) PTFE powder having an average particle size of 0.01 to 1 μm, FEP powder having an average particle size of 0.01 to 1 μm, and h-BN powder having an average particle size of 0.1 to 20 μm and shown in FIG. In the ternary composition diagram, from 39% by mass of solid lubricant powder having a composition ratio within the numerical range corresponding to the region P bounded by the rectangle 80, 4% by mass of surfactant and 57% by mass of water Aqueous dispersion,
(2) In the solid lubricant powder having the composition ratio of (1) above, alumina hydration is ensured by securing a content of h-BN powder of 45% by mass or more in place of part of the h-BN powder content. An aqueous dispersion comprising 39% by mass of the solid lubricant powder (1) containing 20% by mass or less of a product powder, 4% by mass of a surfactant, and 57% by mass of water;
(3) An aqueous dispersion containing 0.1 to 22.5% by mass of a water-soluble organic solvent in addition to the aqueous dispersion of (1) above,
(4) In the aqueous dispersion of (2), any one of aqueous dispersions containing 0.1 to 22.5% by mass of a water-soluble organic solvent is used.

  The aqueous dispersion is a roller coating, brush coating on one surface of one end portion of the expanded parallel graphite sheet in plan view which is a heat-resistant material, or on one entire surface of the expanded expanded graphite sheet in plan view. It is applied by means such as spraying. After the aqueous dispersion is dried, a coating layer of a solid lubricant is formed on one surface of one end of the expanded graphite sheet or on the entire surface of the expanded graphite sheet. After drying, the coating layer of the solid lubricant is, in a heating furnace, (T) to (T + 150 ° C.), preferably (T + 5 ° C.) to (T + 135 ° C.) with respect to the melting point T (= 245 ° C.) of FEP. More preferably, it may be fired for 10 to 30 minutes at a temperature within the range of (T + 10 ° C.) to (T + 125 ° C.). By firing the coating layer of this solid lubricant, A fired coating layer of the solid lubricant is formed on the surface or on one surface of the expanded graphite sheet.

  Next, the manufacturing method of the spherical belt shaped sealing body which consists of an above-described constituent material is demonstrated.

<First manufacturing method>
(First step)
As shown in FIG. 4, a plurality of vertical lines 1 and horizontal lines 2 are woven in a lattice shape using fine metal wires having a wire diameter of 0.15 to 0.50 mm, and a pair of adjacent vertical lines 1. And a pair of horizontal lines 2 adjacent to each other, a plain weave wire mesh 4 having a square mesh 3 having a mesh width of P and Q is prepared. And a parallelogram shape defined by a pair of parallel sides 5 extending in the direction X and a pair of parallel sides 5 and parallel to each other, and forming a mesh 3. One of a pair of diagonal lines connecting the intersection points 7a, 7b, 7c and 7d in each mesh 3 in a group of intersection points 7a, 7b, 7c and 7d between a pair of adjacent vertical lines 1 and a pair of adjacent horizontal lines 2 One intersection group 7b and 7c located on the diagonal line of Are columns, to prepare the other intersection points 7a 7d is elongated are arranged in a direction Y perpendicular to the direction X and the parallelogram-like plain woven metal wire net 8 located on the other diagonal line two.

(Second step)
As shown in FIG. 6, the direction X has a width d in the same direction Y as the width D in the direction Y of the long parallelogram-shaped plain weave wire mesh 8 and is longer than the length L in the direction X of the parallelogram-shaped plainweave wire mesh 8. Are formed in a parallelogram shape defined by a pair of parallel sides 10 extending in the direction X and being inclined with respect to the parallel sides 10 and being parallel to each other. A long expanded graphite sheet 12 to be a heat-resistant material I, II or III containing expanded graphite having a density of 0.3 to 1.5 Mg / m ³ , preferably 0.5 to 1.2 Mg / m ³ is prepared. .

(Third process)
As shown in FIGS. 7 and 8, the expanded graphite sheet 12 is placed between two parallelogram-shaped plain weave wire meshes 8, and the remaining inclined side 11 except for one inclined side 11 is replaced with one of the parallelogram-shaped plainwoven wire meshes 8. A pair of parallel sides 10 are sandwiched between the inclined sides 6 so as to match each pair of parallel sides 5, and two parallelogram-shaped plain weave wire meshes 8 overlapped on the front and back surfaces of the expanded graphite sheet 12 and the expanded graphite sheet 12. 9, the polymer sheet 13 is pressed through a gap δ between a pair of rollers 14 and 15 as shown in FIG. 9, and only the expanded graphite sheet 12 is shown in FIG. And a portion B in which the surface 16 of expanded graphite sheet 12 made of expanded graphite sheet 12 filled in a square mesh 3 and the surface 17 of plain weave wire mesh 4 made of parallelogram-shaped plain weave wire mesh 8 are exposed on both sides. And the slope of the part A Forming the composite sheet 19 of the parallelogram-shaped elongated having an inclined edge 18 of the inclined sides 18 and site matching inclined side 6 and 11 of the B consisting of 11.

(Fourth process)
As shown in FIGS. 11, 12, and 13, in the composite sheet 19, the inclined side 18 of the part A is positioned on the innermost periphery, and the inclined part 18 is not overlapped with the inclined side 18 of the part A in the radial direction. The long composite sheet 19 is wound into a cylindrical shape so that the side 18 is positioned on the outermost periphery, thereby forming a cylindrical molded body 20.

(Fifth process)
As shown in FIG. 14, a cylindrical wall surface 21, a partially concave spherical wall surface 22 continuous to the cylindrical wall surface 21, and an annular wall surface 23 continuous to the partially concave spherical wall surface 22 are provided. A stepped core 24 of the mold 27 is prepared by inserting a stepped core 24 into a mold 27 in which a cylindrical hollow portion 25 and a sphere-shaped hollow portion 26 connected to the cylindrical hollow portion 25 are formed. The cylindrical molded body 20 is inserted into the outer peripheral surface of

(Sixth process)
As shown in FIG. 15, a disk having a cylindrical inner surface 30 that defines a cylindrical outer surface 28 that fits into the cylindrical wall surface 21 of the mold 27 and a circular hole 29 that fits into the cylindrical outer surface of the small-diameter circle of the stepped core 24. An annular projection having a cylindrical inner surface 31 connected to the cylindrical inner surface 30 at the periphery of one opening of the cylindrical body 30a and the circular hole 29 and projecting from one annular end surface 32 of the disk-shaped main body 30a and having an annular tapered surface portion 33 on the outer surface. The pressing punch 35 provided with 34 is fitted to the cylindrical wall surface 21 of the mold 27 and disposed, and the cylindrical molded body 20 disposed in the cylindrical hollow portion 25 and the spherical belt-shaped hollow portion 26 of the mold 27 is Compression molding is performed at a pressure of 98 to 294 N / mm ² (1 to 3 ton / cm ² ) in the axial direction of the stepped core through the pressing punch 35, and the center portion as shown in FIGS. It has a through hole 36 and penetrates A spherical belt-like seal body 41 having a cylindrical inner surface 37 defining a through hole 36, a partially convex spherical outer surface 38, and annular end surfaces 39 and 40 on the large diameter side and small diameter side of the partial convex spherical outer surface 38 is produced.

  The spherical belt-like sealing body 41 has a plurality of vertical lines 1 and horizontal lines 2 forming a plurality of rectangular meshes 3 and forms a plurality of layers between the partially convex spherical outer surface 38 and the cylindrical inner surface 37. A plain woven wire mesh 4 as a reinforcing material comprising a parallelogram plain woven wire mesh 8 wound and compressed between the partially convex spherical outer surface 38 and the cylindrical inner surface 37, and the mesh 3 of the plain woven wire mesh 4 And a heat-resistant material 42 containing expanded graphite made of expanded graphite sheet 12 which is mixed and integrated with and compressed by plain woven wire mesh 4, and these woven wire mesh 4 and heat-resistant material 42 containing expanded graphite are mutually connected. The plain weave wire mesh 4 is uniformly dispersed in the heat-resistant material 42 so that the plain-woven wire mesh 4 and the heat-resistant material 42 have structural integrity, and the partially convex spherical outer surface 38 forms the outermost layer. Parallelogram flat woven wire mesh to be formed The outermost layer is formed with the surface 43 of the heat-resistant material 42 including expanded graphite made of expanded graphite sheet 12 filled with the mesh 3 of the compressed plain woven wire mesh 4 and mixed with the plain woven wire mesh 4. In a compressed plain woven wire mesh 4 composed of parallelogram-shaped plain woven wire mesh 8, a pair of intersection points 7a, 7b, 7c and 7d between adjacent vertical lines 1 and adjacent horizontal lines 2 forming a rectangular mesh 3 are formed. Located on one of the diagonal lines and arranged on the other diagonal of the pair of diagonal lines and the surface of one of the intersection groups 7a and 7d arranged in the axial direction Z and in the circumferential direction R The surface 44 of the plain woven wire mesh 4 including the surface of the other intersecting point groups 7b and 7c arranged is a smooth surface 45. In the partially convex spherical outer surface 38, the intersecting point groups 7a and 7d and the array 7b and Including 7c The surface 44 of the plain weave wire mesh 4 has an area ratio of 10 to 60% with respect to the whole of the partially convex spherical outer surface 38, and the cylindrical inner surface 37 is composed of only the surface of the heat-resistant material 42 containing the expanded graphite of the part A. In the plain woven wire mesh 4 that forms the innermost layer from the outermost layer, the intersection groups 7a7d are arranged in the axial direction Z, and the intersection groups 7 and 7c are arranged in the circumferential direction.

<Second production method>
(First step)
Two parallelogram-shaped plain weave wire meshes 8 similar to the parallelogram-shaped plain weave wire mesh 8 prepared in the first step in the first manufacturing method are prepared.
(Second step)
The long expanded graphite which is the same as the expanded graphite sheet 12 prepared in the second step in the first manufacturing method and has the same length l as the length L of the parallelogram plain woven wire mesh 8 prepared in the first step. A sheet 12 is prepared.

(Third process)
Similar to the expanded graphite sheet 12 prepared in the second step, a short expanded graphite sheet 12 having a length l shorter than the length l of the expanded graphite sheet 12 is prepared.

(Fourth process)
As shown in FIG. 16, a long expanded graphite sheet 12 prepared in the second step is sandwiched between two parallelogram-shaped plain woven wire meshes 8 prepared in the first step, with each side being matched and polymerized. After the polymerized sheet 13 is formed, the polymerized sheet 13 is pressurized through a gap δ between a pair of rollers 14 and 15 shown in FIG. 9, and expanded graphite filled in a square mesh 3 as shown in FIG. A parallelogram shape having a surface 16 of expanded sheet made of sheet 12 and a surface 17 of plain weave wire mesh 4 made of parallelogram-shaped plain weave wire mesh 8 are exposed on both sides and have inclined sides 46 made of coincident inclined sides 6 and 11. The long composite sheet 47 is formed.

(Fifth process)
As shown in FIG. 18, the short expanded graphite sheet 12 prepared in the third step is arranged such that one inclined side 11 is positioned at the innermost periphery and the other inclined side 11 is formed so as to form an overlapping portion 48. After being positioned over one inclined side 11 and wound once in a cylindrical shape, on the outer periphery of a short expanded graphite sheet 12 wound in a cylindrical shape, on the other inclined side 11 of the expanded graphite sheet 12 One of the inclined sides 46 is abutted and the other inclined side 46 parallel to one of the inclined sides 11 of the expanded graphite sheet 12 is not overlapped with the one inclined side 46 in the radial direction on the outermost periphery. Is formed into a cylindrical shape to form a cylindrical molded body 49.

(Sixth process)
The cylindrical molded body 49 is inserted into the outer peripheral surface of the stepped core 24 of the mold 27 shown in FIG. 14, and the cylindrical molded body 49 disposed in the cylindrical hollow portion 25 and the spherical belt-shaped hollow portion 26 of the mold 27 is pressed. A spherical belt-like sealing body as shown in FIGS. 1, 2 and 3 which is compression-molded with a pressure of 98 to 294 N / mm ² (1 to 3 ton / cm ² ) in the axial direction of the stepped core through the punch 35. 41 is produced.

  Such a spherical belt-shaped sealing body 41 is formed in the same manner as the spherical belt-shaped sealing body 41 manufactured by the first manufacturing method.

<Third production method>
(First step)
Two parallelogram-shaped plain weave wire meshes 8 similar to the parallelogram-shaped plain weave wire mesh 8 prepared in the first step in the first manufacturing method are prepared.

(Second step)
A long expanded graphite sheet 12 similar to the expanded graphite sheet 12 prepared in the second step in the first production method is prepared.

(Third process)
In the same manner as in the fourth step of the second manufacturing method, the inclined sides 46 are formed from two parallelogram-shaped plain woven wire meshes 8 prepared in the first step and the long expanded graphite sheet 12 prepared in the second step. The long composite sheet 47 having a parallelogram shape in plan view is formed.

(Fourth process)
As shown in FIG. 19, in the long composite sheet 47, one inclined side 46 is positioned on the innermost periphery, and the other inclined side 46 parallel to the one inclined side 46 does not overlap in the radial direction on the outermost periphery. In this way, it is wound into a cylindrical shape, and the sides 16 parallel to the surface 16 containing expanded graphite comprising the expanded graphite sheet 12 filled in the rectangular mesh 3 of the parallelogram-shaped plain weave wire mesh 8 on each of the innermost circumference and the outermost circumference. A cylindrical base material 52 in which the surface 17 of the plain weave wire mesh 4 composed of the shape plain weave wire mesh 8 is exposed is formed.

(Fifth process)
The expanded graphite sheet 12 is the same as the expanded graphite sheet 12 in the second step of the first manufacturing method, and has a length for winding the outer peripheral surface of the cylindrical base material 52 once and the expanded graphite sheet 12 forming the cylindrical base material 52. A short expanded graphite sheet 12 having a parallelogram shape in plan view having a width smaller than the width, and two parallel four sides having a short length in parallel plan view in plan view having the same length and the same width as the expanded graphite sheet 12 having a short shape. A plain plain wire mesh 8 is prepared.

(Sixth process)
As shown in FIG. 20, the short expanded graphite sheet 12 prepared in the fifth step is sandwiched between the two short parallelogram-shaped plain weave metal meshes 8 prepared in the fifth step. After the polymerization sheet 13 was produced by polymerization, the polymerization sheet 13 was pressurized through a gap δ between the pair of rollers 14 and 15 shown in FIG. 9, and filled into a square mesh 3 as shown in FIG. A surface 16 including expanded graphite made of expanded graphite sheet 12 and a surface 17 of plain woven wire mesh 4 made of parallelogram-shaped plain woven wire mesh 8 are exposed on both sides and have inclined sides 53 made of coincident inclined sides 6 and 11. A short parallel surface-shaped outer surface forming member 54 similar to the composite sheet 47 shown in FIG. 17 is formed.

(Seventh step)
As shown in FIGS. 22 and 23, on the outer peripheral surface of the cylindrical base material 52, one parallel side is made to coincide with the lower end of the cylindrical base material 52 so that the outer surface forming member 54 is connected to the parallel inclined sides 53 and A composite cylindrical molded body 55 wound with a gap in the circumferential direction is formed between it and 53.

(Eighth process)
The composite cylindrical molded body 55 is inserted into the outer peripheral surface of the stepped core 24 of the mold 27 as shown in FIG. 24, and the stepped core 24 is disposed in the mold 27 and the composite cylindrical molded body is placed in the mold 27. 55 is compression-molded at a pressure of 98 to 294 N / mm ² (1 to 3 ton / cm ² ) in the core axial direction through the pressing punch 35, and has a spherical band shape as shown in FIGS. 1, 2, and 3. The seal body 41 is produced.

  The spherical belt-shaped sealing body 41 is the first except that the surface of the plain woven wire mesh 4 made of the parallelogram-shaped plain woven wire mesh 8 and the surface of the heat-resistant body containing expanded graphite made of the expanded graphite sheet 12 are mixed on the cylindrical inner surface 37. It is formed in the same manner as the spherical belt-like seal body 41 manufactured by the manufacturing method.

<Fourth manufacturing method>
(First step)
Two long parallelogram shaped plain woven wire meshes 8 prepared in the first step in the first manufacturing method are prepared.

(Second step)
It is the same as the expanded graphite sheet 12 prepared in the second step in the first manufacturing method, and is at least the innermost of the cylindrical molded body 62 described later than the length L of the parallelogram plain woven wire mesh 8 prepared in the first step. A long expanded graphite sheet 12 having a length l which is longer by a length corresponding to one circumference is prepared. As shown in FIGS. 25 and 26, the expanded graphite sheet 12 has a cylindrical molded body 62 to be described later. A solid lubricant is applied to one surface 57 of one end portion 56 having a length corresponding to one round of the outermost periphery to form a coating layer 58 made of the solid lubricant on the surface 57.

(Third process)
As shown in FIG. 27, the expanded graphite sheet 12 with the coating layer 58 produced in the second step is placed between one end portion 56 of the expanded graphite sheet 12 between the two plain woven wire meshes 8 prepared in the first step. Each side with the one end of the plain weave wire mesh 8 is matched and sandwiched and polymerized to produce a polymer sheet 13, and then the polymer sheet 13 is passed through a gap δ between the pair of rollers 14 and 15 shown in FIG. 28, as shown in FIG. 28, intersection points 7a, 7b, 7c between the portion A of the expanded graphite sheet 12 only and the adjacent vertical lines 1 and the adjacent horizontal lines 2 forming the rectangular mesh 3; One pair of intersection points 7b and 7c located on one of the pair of diagonal lines connecting the intersections at each mesh 3 in 7d are arranged in the direction X parallel to the parallel side 6, while the pair of diagonal lines The other on the other diagonal The groups 7a and 7d include expanded graphite composed of expanded graphite sheets 12 filled in the mesh 3 of a plain weave wire mesh 4 composed of parallelogram-shaped plain weave wire mesh 8 arranged in the direction Y perpendicular to one of the intersection groups 7b and 7c. The portion B where the surface 17 of the plain woven wire mesh 8 filled with expanded graphite composed of the surface 16 and the expanded graphite sheet 12 is exposed, the intersection groups 7a and 7d are arranged in the direction X, and the intersection groups 7a and 7d are arranged in the direction Y, respectively. The surface 3 of the plain woven wire mesh 4 filled with the coating layer 58 on the mesh 3 of the plain woven wire mesh 4 composed of the parallelogram-shaped plain woven wire mesh 8 and the portion C where the surface 59 made of the solid lubricant of the coating layer 58 is exposed. The long composite sheet 61 having a parallelogram shape in plan view having inclined sides 60 inclined in the same direction at both ends in the direction X is formed.

(Fourth process)
As shown in FIG. 29, the composite sheet 61 is provided with the inclined side 60 of the part A on the innermost periphery and the inclined side 60 of the part C on the outermost periphery, and the part A is wound on the innermost peripheral side. A cylindrical molded body 62 is formed by winding C in a cylindrical shape with the surface 59 made of a solid lubricant facing outside and winding it around the outermost periphery.

(Fifth process)
The cylindrical molded body 62 is inserted into the outer peripheral surface of the stepped core 24 of the mold 27 shown in FIG. 14, the stepped core 24 is disposed in the mold 27, and the cylindrical molded body 62 is pressed and punched in the mold 27. 35, compression molding is performed at a pressure of 98 to 294 N / mm ² (1 to 3 ton / cm ² ) in the core axial direction, and a spherical belt-shaped sealing body 41 shown in FIGS. 1, 3, and 37 is manufactured.

  The spherical belt-like sealing body 41 is filled with the plain woven wire mesh 4 and the mesh 3 of the plain woven wire mesh 4 on the partially convex spherical outer surface 38 side, and is compressed together with the plain woven wire mesh 4 so as to be mixed and integrated with the plain woven wire mesh 4. And a solid lubricant composed of the coating layer 58 of the portion C instead of the surface 43 of the heat-resistant material 42 containing expanded graphite on the partially convex spherical outer surface 38. It is formed in the same manner as the ball-shaped seal body 41 obtained by the first manufacturing method except that the agent surface 59 is provided.

<Fifth manufacturing method>
(First step)
Two parallelogram-shaped plain weave wire meshes 8 similar to the parallelogram-shaped plain weave wire mesh 8 prepared in the first step in the first manufacturing method are prepared.

(Second step)
A long expanded graphite sheet 12 similar to the expanded graphite sheet 12 prepared by the first manufacturing method is prepared, and this long expanded graphite sheet 12 corresponds to one round of the outermost circumference of a cylindrical molded body 65 described later. A solid lubricant is applied to one surface 57 of one end portion 56 having a length to form a coating layer 58 made of the solid lubricant on the surface 57.

(Third process)
As shown in FIG. 30, the expanded graphite sheet 12 produced in the second step is sandwiched between two plain woven wire meshes 8 prepared in the first step so that each side is matched and polymerized by being sandwiched. After producing the sheet 13, the polymerization sheet 13 is pressurized through the gap δ between the pair of rollers 14 and 15 shown in FIG. 9, and as shown in FIG. 31, it is the same as the parts B and C in the fourth manufacturing method. A long composite sheet 64 having a parallelogram shape in plan view, which includes portions B and C and has parallel inclined sides 63 whose both ends are inclined in the same direction, is formed.

(Fourth process)
As shown in FIG. 32, the short expanded graphite sheet 12 is the same as the expanded graphite sheet 12 prepared by the first manufacturing method and has a length corresponding to one round of the innermost circumference of the cylindrical molded body 65. One of the inclined sides 11 is positioned on the innermost circumference, and the other inclined side 11 is positioned with the overlapping portion 48 beyond the one inclined side 11 to wind the short expanded graphite sheet 12 once in a cylindrical shape. After that, the one inclined side 63 is opposed to the other inclined side 11 of the short expanded graphite sheet 12, and the other inclined side 63 is not overlapped with the one inclined side 63 at the outermost periphery. Is cylindrically wound around the short expanded graphite sheet 12 which has been wound in a cylindrical shape first, and the surface 17 of the plain weave wire mesh 4 and the surface 59 of the coating layer 58 are exposed on the outermost outermost surface. Form.

(Fifth process)
The cylindrical molded body 65 is inserted into the outer peripheral surface of the stepped core 24 of the mold 27 shown in FIG. 14, the stepped core 24 is disposed in the mold 27, and the cylindrical molded body 65 is pressed into the press punch in the mold 27. 35, compression molding is performed at a pressure of 98 to 294 N / mm ² (1 to 3 ton / cm ² ) in the core axial direction, and a spherical belt-shaped sealing body 41 shown in FIGS. 1, 3, and 37 is manufactured.

  The spherical belt-like sealing body 41 is filled with the plain woven wire mesh 4 and the mesh 3 of the plain woven wire mesh 4 on the partially convex spherical outer surface 38 side, and is compressed together with the plain woven wire mesh 4 so as to be mixed and integrated with the plain woven wire mesh 4. And a solid lubricant composed of the coating layer 58 of the portion C instead of the surface 43 of the heat-resistant material 42 containing expanded graphite on the partially convex spherical outer surface 38. It is formed in the same manner as the ball-shaped seal body 41 obtained by the first manufacturing method except that the agent surface 59 is provided.

<Sixth manufacturing method>
(First step)
A parallelogram plain woven wire mesh 8 prepared in the first step of the first manufacturing method, having the same width and length as the long expanded graphite sheet 12 prepared in the second step of the first manufacturing method. Two long parallelogram shaped plain woven wire meshes 8 are prepared.

(Second step)
25 and 26 produced in the second step of the fourth manufacturing method, the same length as that of the expanded graphite sheet 12 provided with a coating layer 58 of a solid lubricant on one surface 57 of one end 56 shown in FIGS. An expanded graphite sheet 12 is prepared.

(Third process)
After sandwiching the expanded graphite sheet 12 prepared in the second step between the two plain woven wire meshes 8 prepared in the first step with each side matched, the same as in the third step in the fifth manufacturing method. Thus, the composite sheet 64 is formed.

(Fourth process)
As shown in FIG. 33, the composite sheet 64 is provided with an inclined side 63 on the part B side on the innermost periphery, an inclined side 63 on the part C side on the outermost periphery, and the inclined side 63 on the part B side in the radial direction. The cylindrical molded body 68 is formed so as not to overlap and wound into a cylindrical shape.

(Fifth process)
The cylindrical molded body 68 is inserted into the outer peripheral surface of the stepped core 24 of the mold 27 shown in FIG. 14, the stepped core 24 is disposed in the mold 27, and the cylindrical molded body 68 is pressed into the press punch in the mold 27. 35, compression molding is performed at a pressure of 98 to 294 N / mm ² (1 to 3 ton / cm ² ) in the core axial direction, and a spherical belt-shaped sealing body 41 shown in FIGS. 1, 3, and 37 is manufactured.

  The spherical belt-like sealing body 41 is filled with the plain woven wire mesh 4 and the mesh 3 of the plain woven wire mesh 4 on the partially convex spherical outer surface 38 side, and is compressed together with the plain woven wire mesh 4 so as to be mixed and integrated with the plain woven wire mesh 4. A solid lubricant composed of the coating layer 58 of the portion C formed, and a surface of the plain woven wire mesh 4 composed of the parallelogram plain woven wire mesh 8 and a surface of expanded graphite composed of the expanded graphite sheet 12 on the cylindrical inner surface 37. The first manufacturing is performed except that a partially convex spherical outer surface 38 is provided with a surface 59 of a solid lubricant composed of a coating layer 58 of the portion C instead of the surface 43 of the heat-resistant material 42 containing expanded graphite. It is formed in the same manner as the ball-shaped seal body 41 obtained by the method.

<Seventh manufacturing method>
(First step)
A cylindrical base material 52 shown in FIG. 19 is formed by a method similar to the third manufacturing method.

(Second step)
A short expanded graphite sheet 12 prepared in the fifth step in the third manufacturing method and two parallelogram-shaped plain woven wire meshes 8 having the same length and width as the short expanded graphite sheet 12 are prepared.

(Third process)
As shown in FIG. 34, a solid lubricant is applied to the entire surface of one of the short expanded graphite sheets 12 to form a coating layer 58 of the solid lubricant on the entire surface.

(Fourth process)
As shown in FIG. 35, a short expanded graphite sheet 12 provided with a coating layer 58 of a solid lubricant is polymerized by sandwiching each side between two short plain woven wire meshes 8 so as to be polymerized. 13 is prepared, the polymerization sheet 13 is pressed through the gap δ between the pair of rollers 14 and 15 shown in FIG. 9, and as shown in FIG. 36, adjacent vertical lines 1 forming a square mesh 3 are formed. One intersection group 7b and 7c located on one diagonal line of the pair of diagonal lines connecting the intersections at each mesh 3 in the intersection group 7a, 7b, 7c and 7d with the adjacent horizontal line 2 is parallel side 6 A parallelogram plain woven wire mesh in which the other intersection groups 7a and 7d located on the other diagonal line of the pair of diagonal lines are arranged in the direction Y orthogonal to the direction X. 8 of plain weave wire mesh 4 and covering 17 It ends with the surface 59 is exposed for 58 to form a plan view a parallelogram-shaped outer surface forming member 70 having an inclined edge 69 which is inclined in the same direction.

(Eighth process)
As shown in FIGS. 22 and 23, the outer surface forming member 70 is formed on the outer peripheral surface of the cylindrical base material 52 so that one parallel side coincides with the lower end of the cylindrical base material 52, and parallel inclined sides 69 at both ends thereof. A composite cylindrical molded body 71 wound with a gap in the circumferential direction is formed.

(Ninth process)
As shown in FIG. 24, the composite cylindrical molded body 71 is inserted into the outer peripheral surface of the stepped core 24 of the mold 27, and the stepped core 24 is disposed in the mold 27 and the composite cylindrical molded body 71 is placed in the mold 27. Is pressed with a pressure of 98 to 294 N / mm ² (1 to 3 tons / cm ² ) in the axial direction of the stepped core through the press punch 35, and a spherical belt shape as shown in FIGS. 1, 3 and 37. The seal body 41 is produced.

  The spherical belt-shaped sealing body 41 is formed in the same manner as the spherical belt-shaped sealing body 41 manufactured by the sixth manufacturing method.

  In the first to seventh production methods, any of the expanded graphite sheets I, II and III may be used as the expanded graphite sheet 12, and the spheres obtained by the first to seventh production methods. In the band-shaped seal body 41, the annular end surface 39 has a plane of a plain weave wire mesh 4 made of a parallelogram-shaped plain weave wire mesh 8 and a surface of expanded graphite made of an expanded graphite sheet 12 filled with a square mesh 3 of the plain weave wire mesh 4. The annular end surface 39 includes an annular flat end surface portion 74 connected to the annular end 73 on the large diameter side of the partially convex spherical outer surface 38 by an annular large diameter edge 72, and an annular shape. An annular inner tapered surface portion 79 connected to the annular small diameter edge 75 of the flat end surface portion 74 with a large diameter edge 76 and connected to the annular one end edge 78 in the axial direction Z of the cylindrical inner surface 37 at the small diameter edge 77. And may have a book In Jo end surface 39, the inner tapered surface portion 79, an annular tapered surface part 33 of the pressing punch 35 shown in FIG. 15, an annular flat end face portion 74 may be respectively formed in an annular tapered surface part 33 of the pressing punch 35.

  In the exhaust pipe spherical joint shown in FIG. 41 in which the ball-shaped seal body 41 is incorporated, the flange 200 stands on the outer peripheral surface of the upstream exhaust pipe 100 connected to the engine side, leaving the pipe end portion 101. A spherical band-shaped seal body 41 is fitted to the tube end portion 101 at a cylindrical inner surface 37 that defines the through hole 36, and the spherical band-shaped seal body 41 is flanged 200 on the annular end surface 39 on the large diameter side. Is connected to the upstream exhaust pipe 100 and connected to the muffler side, and is connected to the concave spherical surface portion 302 and the concave spherical surface portion 302. The enlarged diameter portion 301 integrally provided with the flange portion 303 is fixed, and the inner surface 304 of the concave spherical surface portion 302 is in sliding contact with the partially convex spherical outer surface 38 of the spherical belt-shaped seal body 41.

  In the exhaust pipe spherical joint shown in FIG. 41, a pair of bolts 400 having one end fixed to the flange 200 and the other end inserted through the flange portion 303 of the enlarged diameter portion 301 and the enormous head and flange portion of the bolt 400. A spring force is always applied to the downstream side exhaust pipe 300 in the direction of the upstream side exhaust pipe 100 by the pair of coil springs 500 arranged between 303. The exhaust pipe spherical joint is used as a sliding surface of the partially convex spherical outer surface 38 of the spherical seal 41 and against the relative angular displacement generated in the upper and downstream exhaust pipes 100 and 300. This is allowed by sliding contact with the inner surface 304 of the concave spherical surface portion 302 of the enlarged diameter portion 301 formed at the end portion.

  Next, the present invention will be described in detail based on examples. The present invention is not limited to these examples.

Example 1
A plain woven wire mesh woven with a square mesh having a mesh width of 1.5 mm and a width of 1.5 mm using a single austenitic stainless steel wire (SUS304) having a wire diameter of 0.28 mm as a thin metal wire and a density of 1. A spherical belt-shaped sealing body was manufactured by a first manufacturing method using an expanded graphite sheet as a heat-resistant material I having 12 Mg / cm ³ and a thickness of 0.28 mm.

  In the obtained spherical belt-shaped sealing body, the surface of the plain woven wire mesh on the partially convex spherical outer surface had an area ratio of 43% with respect to the entire partial convex spherical outer surface.

Example 2
First using a plain woven wire mesh woven with a square mesh having a mesh width of 2.0 mm and a width of 2.0 mm using the same fine metal wire as in Example 1 and the expanded graphite sheet as in Example 1. A spherical belt-like seal body was manufactured by the manufacturing method of.

  In the obtained spherical belt-shaped sealing body, the surface of the plain weave wire mesh on the partially convex spherical outer surface had an area ratio of 35% with respect to the entire partially convex spherical outer surface.

Example 3
Using a plain woven wire mesh woven with a square mesh having a mesh width of 2.5 mm and a width of 2.5 mm using the same fine metal wire as in Example 1, and an expanded graphite sheet similar to that in Example 1, A ball-shaped seal body was manufactured by the second manufacturing method.

  In the obtained spherical belt-shaped sealing body, the surface of the plain woven wire mesh on the partially convex spherical outer surface had an area ratio of 28% with respect to the entire partially convex spherical outer surface.

Example 4
A cylindrical base material using the same plain woven wire mesh and expanded graphite sheet as in Example 1 and a single austenitic stainless steel wire (SUS304) having a wire diameter of 0.15 mm as a fine metal wire are used. A spherical belt-like seal body was obtained by a third production method from a plain woven wire mesh woven with a square mesh of 0 mm and a width of 2.0 mm and an outer surface forming member using an expanded graphite sheet similar to Example 1.

  In the obtained spherical belt-shaped sealing body, the surface of the plain woven wire mesh on the partially convex spherical outer surface had an area ratio of 20% with respect to the entire partial convex spherical outer surface.

Example 5
Example 1 A plain woven wire mesh woven with a square mesh having a mesh width of 2.5 mm and a width of 2.5 mm using one austenitic stainless steel wire (SUS304) having a wire diameter of 0.32 mm as a thin metal wire Using a cylindrical base material using the same expanded graphite sheet and a single austenitic stainless steel wire (SUS304) with a wire diameter of 0.28 mm as a fine metal wire, the mesh width is 2.5 mm long and 2.5 mm wide A spherical belt-like seal body was obtained by a third production method from a plain woven wire mesh woven with a square mesh and an outer surface forming member using the same expanded graphite sheet as in Example 1.

  In the obtained spherical belt-shaped sealing body, the surface of the plain woven wire mesh on the partially convex spherical outer surface had an area ratio of 28% with respect to the entire partially convex spherical outer surface.

Example 6
25% by mass of PTFE powder with an average particle size of 0.20 μm, 15% by mass of FEP powder with an average particle size of 0.15 μm, 39% by mass of powder for solid lubricant containing 60% by mass of h-BN powder with an average particle size of 8 μm, Aqueous dispersion (PTFE 9.75 mass%, FEP 5.85 mass%, h-BN 23.4 mass%) comprising 4 mass% polyoxyethylene alkyl ether (nonionic surfactant) and 57 mass% water as a surfactant. , 4% by weight of nonionic surfactant and 57% by weight of water) are roller-coated and dried at a temperature of 100 ° C., and PTFE, FEP and h-BN solid lubricants (PTFE 25% by weight, FEP 15% by weight) And an expanded graphite sheet similar to Example 1 in which a coating layer of h-BN 60 mass%) is formed on one surface of one end, and a plain woven wire mesh similar to Example 1. To obtain a spherical annular seal member in fourth production process.

  In the obtained spherical belt-shaped sealing body, the surface of the plain woven wire mesh on the partially convex spherical outer surface had an area ratio of 40% with respect to the entire partially convex spherical outer surface.

Example 7
12% by mass of PTFE powder having an average particle size of 0.20 μm, 28% by mass of FEP powder having an average particle size of 0.15 μm, 39% by mass of powder for solid lubricant containing 60% by mass of h-BN powder having an average particle size of 8 μm, Aqueous dispersion composed of 4% by mass of polyoxyethylene alkyl ether (nonionic surfactant) and 57% by mass of water as a surfactant (4.68% by mass of PTFE, 10.92% by mass of FEP, 23.4% by mass of h-BN) 4% by weight of a nonionic surfactant and 57% by weight of water) and dried at a temperature of 100 ° C. to obtain a solid lubricant of PTFE, FEP and h-BN (12% by weight of PTFE, 28% by weight of FEP and h-BN (60 mass%) coating layer formed on one surface of one end, and the same expanded graphite sheet as in Example 1 and a fine metal wire having a wire diameter of 0.42 mm -Using a single austenitic stainless steel wire (SUS304), a spherical belt-shaped seal body is produced by a fourth manufacturing method from a plain weave wire mesh woven with a square mesh having a mesh width of 2.5 mm and a width of 2.5 mm. Obtained.

  In the obtained spherical belt-shaped sealing body, the surface of the plain woven wire mesh on the partially convex spherical outer surface had an area ratio of 38% with respect to the entire partially convex spherical outer surface.

  Example 8

  PTFE powder having an average particle size of 0.20 μm, 10% by mass, FEP powder having an average particle size of 0.15 μm, 40% by mass, and 39% by mass of powder for solid lubricant containing 50% by mass of h-BN powder having an average particle size of 8 μm, Aqueous dispersion (PTFE 3.9% by mass, FEP 15.6% by mass, h-BN 19.5% by mass) comprising 4% by mass of polyoxyethylene alkyl ether (nonionic surfactant) and 57% by mass of water as a surfactant. , 4% by weight of a nonionic surfactant and 57% by weight of water) and dried at a temperature of 100 ° C. to obtain a solid lubricant of PTFE, FEP and h-BN (PTFE 10% by weight, FEP 40% by weight and h-BN 50 mass%) is formed from an expanded graphite sheet similar to Example 1 in which a coating layer is formed on one surface of one end and a plain woven wire mesh similar to Example 2. And a composite sheet, to obtain a spherical annular seal member in the fifth production method using an expanded graphite sheet similar short as in Example 1.

  In the obtained spherical belt-shaped sealing body, the surface of the plain woven wire mesh on the partially convex spherical outer surface had an area ratio of 32% with respect to the entire partially convex spherical outer surface.

Example 9
A plain woven wire mesh woven with a square mesh having a mesh width of 3.0 mm and a width of 3.0 mm using one austenitic stainless steel wire (SUS304) having a wire diameter of 0.28 mm as a fine metal wire, and an average grain size Solid lubricant powder 39% by mass containing 20% by mass of PTFE powder having a diameter of 0.20 μm, 40% by mass of FEP powder having an average particle size of 0.15 μm and 40% by mass of h-BN powder having an average particle size of 8 μm, surface activity As an agent, an aqueous dispersion comprising 4% by mass of polyoxyethylene alkyl ether (nonionic surfactant) and 57% by mass of water (7.8% by mass of PTFE, 15.6% by mass of FEP, 15.6% by mass of h-BN, non) 4% by weight of ionic surfactant and 57% by weight of water) are roller coated and dried at a temperature of 100 ° C. to obtain a solid lubricant of PTFE, FEP and h-BN (PT E20% by mass, FEP40% by mass and h-BN40% by mass) using the same expanded graphite sheet as in Example 1 in which a coating layer was formed on one surface of one end portion, and the sphere by the sixth production method A belt-like seal body was obtained.

  In the obtained spherical belt-shaped sealing body, the surface of the plain woven wire mesh on the partially convex spherical outer surface had an area ratio of 24% with respect to the entire partially convex spherical outer surface.

Example 10
A plain woven wire mesh woven with a square mesh having a mesh width of 2.5 mm and a width of 2.5 mm using one austenitic stainless steel wire (SUS304) having a wire diameter of 0.32 mm as a thin metal wire, and average grain size PTFE powder with a diameter of 0.20 μm, 39% by mass of a powder for solid lubricant containing 22% by mass of FEP powder with an average particle size of 0.15 μm and 40% by mass of h-BN powder with an average particle size of 8 μm, surface activity Aqueous dispersion comprising 4% by mass of polyoxyethylene alkyl ether (nonionic surfactant) and 57% by mass of water as an agent (PTFE 14.82% by mass, FEP 8.58% by mass, h-BN 15.6% by mass, non-aqueous) PTFE, FEP and h-BN solid lubricants (P) 4% by weight of ionic surfactant and 57% by weight of water) and dried at a temperature of 100 ° C. Spheres by the sixth production method using an expanded graphite sheet similar to Example 1 in which a coating layer of FE 38 mass%, FEP 22 mass% and h-BN 40 mass%) is formed on one surface of one end. A belt-like seal body was obtained.

  In the obtained spherical belt-shaped sealing body, the surface of the plain woven wire mesh on the partially convex spherical outer surface had an area ratio of 27% with respect to the entire partial convex spherical outer surface.

Example 11
A plain woven wire mesh woven with a square mesh having a mesh width of 2.0 mm and a width of 2.0 mm using one austenitic stainless steel wire (SUS304) having a wire diameter of 0.5 mm as a thin metal wire, Contains 22% by mass of PTFE powder having a diameter of 0.20 μm, 22% by mass of FEP powder having an average particle size of 0.15 μm, 53% by mass of h-BN powder having an average particle size of 8 μm, and 3% by mass of boehmite powder as an alumina hydrate. Aqueous dispersion (PTFE 8.58% by mass, FEP 8.58% by mass) comprising 39% by mass of powder for solid lubricant, 4% by mass of polyoxyethylene alkyl ether (nonionic surfactant) as a surfactant and 57% by mass of water %, H-BN 20.67% by weight, nonionic surfactant 4% by weight and water 57% by weight) and dried at a temperature of 100 ° C. Example 1 in which a coating layer of FE, FEP and h-BN solid lubricant (PTFE 22 mass%, FEP 22 mass%, h-BN 53 mass% and boehmite 3 mass%) was formed on one surface of one end. Using the same expanded graphite sheet, a spherical belt-like seal body was obtained by the sixth production method.

  In the obtained spherical belt-shaped sealing body, the surface of the plain woven wire mesh on the partially convex spherical outer surface had an area ratio of 55% with respect to the entire partial convex spherical outer surface.

Example 12
A cylindrical base material produced using the same expanded graphite sheet as in Example 1 and a plain weave wire mesh as in Example 10, and one austenitic stainless steel wire (SUS304) having a wire diameter of 0.15 mm as a thin metal wire A plain woven wire mesh woven with a square mesh having a length of 1.5 mm and a width of 1.5 mm, and 35% by mass of PTFE powder having an average particle size of 0.20 μm and FEP powder 15 having an average particle size of 0.15 μm. 39% by mass of powder for solid lubricant containing 50% by mass of h-BN powder having an average particle size of 8 μm, 4% by mass of polyoxyethylene alkyl ether (nonionic surfactant) as a surfactant and 57 of water Aqueous dispersion consisting of mass% (PTFE 13.65 mass%, FEP 5.85 mass%, h-BN 19.5 mass%, nonionic surfactant 4 mass% and water 57 mass% A coating layer of a solid lubricant of PTFE, FEP and h-BN (35% by weight of PTFE, 15% by weight of FEP and 50% by weight of h-BN) that has been roller-coated and dried at a temperature of 100 ° C. is formed on one entire surface. Using the outer surface forming member formed of the same expanded graphite sheet as in Example 1, a spherical belt-shaped seal body was obtained by the seventh manufacturing method.

  In the obtained spherical belt-shaped sealing body, the surface of the plain weave wire mesh on the partially convex spherical outer surface had an area ratio of 21% with respect to the entire partially convex spherical outer surface.

Example 13
In the same manner as in Example 12, a cylindrical base material and a single austenitic stainless steel wire (SUS304) having a wire diameter of 0.28 mm as a fine metal wire are used, and the mesh width is 2.5 mm long and 2.5 mm wide. Plain woven wire mesh woven with a mesh of shape and aqueous dispersion similar to Example 6 (PTFE 9.75 mass%, FEP 5.85 mass%, h-BN 23.4 mass%, nonionic surfactant 4 mass% and 57% by weight of water) is roller-coated, dried at a temperature of 100 ° C., and further baked in a heating furnace at a temperature of 340 ° C. for 20 minutes to form a solid lubricant of PTFE, FEP and h-BN (25% by weight of PTFE, FEP 15 And an outer surface forming member formed of the same expanded graphite sheet as in Example 1 in which a coating layer of 60% by mass and 60% by mass of h-BN is formed on one surface of one end. To obtain a spherical annular seal member in the manufacturing method.

  In the obtained spherical belt-shaped sealing body, the surface of the plain woven wire mesh on the partially convex spherical outer surface had an area ratio of 27% with respect to the entire partial convex spherical outer surface.

Comparative Example 1
Using one austenitic stainless steel wire (SUS304) with a wire diameter of 0.28 mm as a thin metal wire, a cylindrical braided wire mesh with a mesh width of 4 mm and a width of 5 mm is produced, and this is passed between a pair of rollers. After using the expanded graphite sheet similar to Example 1 having a density of 1.12 Mg / cm ³ and a thickness of 0.38 mm as the heat-resistant material I, and winding the expanded graphite sheet in a spiral shape, A tubular base metal was produced in which a band-shaped wire mesh was superposed on the inner side of the expanded graphite sheet and wound in a spiral shape to locate the expanded graphite sheet on the outermost periphery. In this cylindrical base material, both end portions in the width direction (direction Y) of the expanded graphite sheet respectively protrude (extrude) in the width direction of the belt-shaped wire mesh.

  Separately preparing an expanded graphite sheet similar to the above expanded graphite sheet, 100 parts by mass of a solid lubricant composed of 85% by mass of h-BN powder and 15% by mass of alumina powder on one surface of the expanded graphite sheet was obtained. An aqueous dispersion (h-BN of 10.2% by mass) containing a solid lubricant (h-BN of 34% by mass, PTFE of 60% by mass and alumina of 6% by mass) dispersed in an amount of 30% by weight as a solid content. , PTFE 18% by mass, alumina 1.8% by mass, moisture 70% by mass), and the coating operation of drying at a temperature of 100 ° C. was repeated three times, and a solid lubricant was applied to one surface of the expanded graphite sheet. A coating layer (34% by mass of h-BN, 60% by mass of PTFE, and 6% by mass of alumina) was formed.

  After forming a cylindrical braided wire mesh comprising a braided wire mesh (see FIG. 39) having a mesh width of 3.5 mm and a width of 2.5 mm using an austenitic stainless steel wire (SUS304) having a wire diameter of 0.28 mm This is passed through between the rollers to form a strip metal mesh, and an expanded graphite sheet provided with a coating layer is inserted into the strip metal mesh and these are integrated by passing between the rollers, so that the surface of the solid lubricant and the surface of the braided wire mesh An outer surface forming member having one surface mixed with was produced.

On the outer peripheral surface of the cylindrical base material, the outer surface forming member is wound with one surface where the surface of the solid lubricant and the braided wire mesh are mixed, and a wound composite cylindrical molded body is produced. After the body is disposed in the hollow portion of the mold, the composite cylindrical molded body is compression-molded in the mold at a pressure of 294 N / mm ² (3 ton / cm ² ) in the core axial direction, and the inner surface of the cylinder is partially convex. A spherical belt-shaped sealing body having annular end surfaces on the large diameter side and the small diameter side of the spherical outer surface and the partially convex spherical outer surface was obtained.

  The obtained spherical belt-like sealing body is composed of a wire mesh made of a compressed braided wire mesh, and an expanded graphite sheet as a heat-resistant material that is filled and mixed with the braided wire mesh and compressed. The partially convex spherical outer surface has a smooth surface in which a braided metal mesh made of a wire mesh and a solid lubricant are mixed, and the braided metal mesh on the partially convex spherical outer surface is 43.4. % Area ratio.

Comparative Example 2
A cylindrical base material in which both end portions in the width direction of the expanded graphite sheet similar to Comparative Example 1 protrude (extrude) in the width direction of the braided wire mesh similar to Comparative Example 1 was produced.

  Using an austenitic stainless steel wire (SUS304) with a wire diameter of 0.28 mm as a thin metal wire, a plurality of vertical lines and horizontal lines are woven in a lattice pattern, and adjacent vertical lines and adjacent horizontal lines A rectangular plain woven wire mesh was produced using a plain woven wire mesh woven with a square mesh having a width of 2.0 mm in length and 2.0 mm in width.

  A solid dispersion containing 34% by mass of h-BN, 60% by mass of PTFE, and 6% by mass of alumina was applied to one surface of the same expanded graphite sheet as in Example 1 by using an aqueous dispersion comprising the same solid lubricant as in Comparative Example 1. An expanded graphite sheet provided with a lubricant coating layer was prepared. The expanded graphite sheet provided with the coating layer of the solid lubricant is sandwiched between two plain weave metal meshes with each side matched, and then the expanded graphite sheet and the two plain weave metal meshes are placed in a gap between a pair of rollers. A flat line in which a flat woven wire mesh is filled with expanded graphite and a solid lubricant, and a vertical line that forms a square mesh of the plain woven wire mesh is in the direction Y in cooperation with the vertical line. A rectangular outer surface forming member was produced in which horizontal lines forming a square mesh of a plain weave wire mesh were arranged in parallel to the direction X, respectively.

  A composite cylindrical molded body was produced in which the outer surface forming member was wound around the outer peripheral surface of the cylindrical base material with the surface where the surface of the plain woven wire mesh and the surface made of the solid lubricant were mixed.

  Thereafter, in the same manner as in Example 1, a spherical belt-shaped sealing body having annular end surfaces on the large diameter side and the small diameter side of the cylindrical inner surface, the partially convex spherical outer surface, and the partially convex spherical outer surface was obtained.

  The obtained spherical belt-shaped sealing body is formed such that expanded graphite and plain weave wire mesh are compressed and entangled with each other to have structural integrity, and the expanded graphite and plain weave wire mesh are compressed to form a mesh of plain weave wire mesh. Is filled with a solid lubricant containing expanded graphite and PTFE 60% by mass, h-BN 34% by mass and alumina 6% by mass, and the expanded graphite and the solid lubricant are mixed and integrated. A plane made of a solid lubricant and a plane of a plain woven wire mesh in which a group of vertical lines forming a mesh are arranged in the direction Y and a group of horizontal lines forming the mesh in the circumferential direction R (see FIG. 40) are mixed. The surface of the plain woven wire mesh was exposed with an area ratio of 25%.

  Next, the ball-shaped seal bodies obtained in Examples 1 to 13 and Comparative Examples 1 and 2 described above are incorporated into the exhaust pipe joint shown in FIG. 41, and the surface roughness of the mating member surface is determined by a rocking test. Changes, presence / absence of frictional noise, and gas leakage (l / min) were tested.

<Test conditions for rocking test>
Temperature (temperature of the surface of the enlarged diameter portion 301 shown in FIG. 41) 300 ° C.
Amplitude (oscillation angle) ± 2 °
Excitation frequency 25Hz
Excitation time 42Hr
Set load by coil spring 650N
Number of vibrations 3,740,000 Counterpart material (material of enlarged diameter portion 301 shown in FIG. 41) SUS304

<Test conditions for presence / absence of frictional noise>
Temperature (temperature of the surface of the enlarged diameter portion 301 shown in FIG. 41) Room temperature (25 ° C.) to 500 ° C.
Excitation frequency 25Hz
Sliding distance (amplitude) ± 0.05 to ± 2.05mm
Excitation time 40 minutes (1 cycle)
Set load by coil spring 650N

<Test method>
41, the upstream side exhaust pipe 100 of the exhaust pipe joint shown in FIG. 41 is fixed, and high temperature gas is circulated through the upstream side exhaust pipe 100 to raise the surface temperature of the counterpart material (diameter enlarged portion 301 shown in FIG. 41) to 300 ° C. After the surface temperature of the counterpart material reaches 300 ° C., the other exhaust pipe 300 is subjected to a swinging motion with an excitation frequency of 25 Hz and an amplitude of ± 2 ° for 42 hours (the number of times of excitation is 374 times). First, the temperature is lowered to room temperature (rocking test). Subsequently, the surface temperature of the counterpart material is raised to 500 ° C. in 10 minutes, and when the surface temperature of the counterpart material reaches 500 ° C., vibration is performed for 10 minutes under conditions of a frequency of 25 Hz and an amplitude of ± 0.05 mm. Next, the amplitude of the mating material was varied from ± 0.05 mm to ± 2.05 mm while lowering the surface temperature of the counterpart material from 500 ° C. to room temperature, and the presence or absence of frictional noise at the amplitude was measured (frictional abnormality). Test for the presence of sound).

<Test conditions for gas leakage>
Pressing force with a coil spring (spring set force): 650 N
Oscillation angle: ± 2 °
Excitation frequency (oscillation speed): 5Hz
Temperature (diameter enlarged portion 301 shown in FIG. 41): Room temperature (RT = 25 ° C.) to 500 ° C.
Number of swings: 1 million times Counterpart material (material of the enlarged diameter portion 301 shown in FIG. 41): SUS304

<Test method>
After performing the rocking test under the rocking test conditions, the surface temperature of the mating member is raised to 500 ° C while continuing the rocking motion of ± 2 ° at an excitation frequency of 5 Hz at room temperature. The swinging motion is continued while being held, (1) before starting the test, (2) after 250,000 swings, (3) after 500,000 swings, and (4) 1 million swings. The amount of gas leakage at the time of arrival was measured.

<Measurement method of gas leakage>
The opening part of the upstream exhaust pipe 100 of the exhaust pipe joint shown in FIG. 41 is closed, and dry air is introduced from the downstream exhaust pipe 300 side at a pressure of 49 kPa (0.5 kgf / cm ² ). A sliding contact portion between the partially convex spherical outer surface 38 of the belt-shaped seal body 41 and the inner surface 304 of the concave spherical surface portion 302, and a fitting portion between the cylindrical inner surface 37 of the spherical belt-shaped seal body 41 and the pipe end portion 101 of the upstream exhaust pipe 100. And (1) before the start of the test, (2) when the number of swings reaches 250,000 times, and (3) the number of swings, from the contact portion between the annular end surface 39 and the flange portion 200 erected on the upstream side exhaust pipe 100 The amount of gas leakage when reaching 500,000 times and (4) reaching 1 million times of rocking was measured with a flow meter.

  Tables 1 to 4 show the above test results, and Tables 5 to 8 show the test progress and test results of frictional noise for Example 2, Example 8, Example 12, and Comparative Example 2. The determination of frictional noise was made according to the following criteria.

<Determination of frictional noise>
Symbol: 0 No friction noise was generated.
Symbol: 0.5 Friction noise can be confirmed on the sound collecting pipe.
Symbol: The generation of frictional noise can be confirmed at a position about 0.2 m away from the sliding part of the exhaust pipe spherical joint.
Symbol: 1.5 Generation of abnormal noise can be confirmed at a position about 0.5 m away from the sliding part of the exhaust pipe spherical joint.
Symbol: 2 Friction noise can be confirmed at a position about 1 m away from the sliding part of the exhaust pipe spherical joint.
Symbol: 2.5 The generation of abnormal noise can be confirmed at a position about 2 m away from the sliding part of the exhaust pipe spherical joint.
Symbol: 3 The generation of frictional noise can be confirmed at a position about 3 m away from the sliding part of the exhaust pipe spherical joint.
Symbol: 3.5 Generation of abnormal noise can be confirmed at a position about 5 m away from the sliding part of the exhaust pipe spherical joint.
Symbol: 4 Friction noise can be confirmed at a position about 10 m away from the sliding part of the exhaust pipe spherical joint.
Symbol: 4.5 Generation of abnormal noise can be confirmed at a position about 15 m away from the sliding part of the exhaust pipe spherical joint.
Symbol: 5 Generation | occurrence | production of friction noise can be confirmed in the position about 20m away from the sliding part of the exhaust pipe spherical joint.

  In the above determination, it was determined that the symbol 0 to the symbol 2.5 is no occurrence of friction noise (pass), and the symbol 3 to the symbol 5 was determined to be occurrence of friction noise (fail). .

  From the test results shown in Tables 1 to 8, the spherical belt-like sealing bodies obtained in Examples 1 to 13 were compared with Comparative Example 1 in terms of roughening of the mating material surface, evaluation of frictional noise, and gas leakage. And it turns out that it is superior to the spherical belt shaped sealing body obtained in Comparative Example 2. And, on the partially convex spherical outer surface of the spherical belt-shaped sealing body of Comparative Example 2, although the plain weave wire mesh similar to the spherical belt-shaped sealing body obtained in Example 1 to Example 13 is exposed, The roughening of the surface of the mating material increased because the adjacent vertical line groups forming the rectangular mesh of the plain weave wire mesh are arranged along the axial direction, and the adjacent horizontal line groups are arranged along the circumferential direction. It is inferred that the surface of the mating member is caused by sliding in direct contact with the vertical line group and horizontal line group of the plain weave wire mesh always in the sliding direction.

  As described above, in the spherical belt-like seal body of the present invention, the plain weave wire mesh and the expanded graphite integrated with the plain weave wire mesh are intertwined with each other, and the plain weave wire mesh is universal. The internal homogenization is enhanced, and the partially convex spherical outer surface can eliminate a large nodule-like mass at the intersection point group, and in the sliding friction with the counterpart material, the mesh It is possible to reduce the induction of abrasive wear between the intersection group and the surface of the mating member as much as possible, to reduce the roughening due to the damage of the mating material surface and to prevent the deterioration of the sealing performance as much as possible.

  In addition, even when the plain weave wire mesh of the partially convex spherical outer surface forming the outermost layer is worn, the friction sliding with the plain weave wire mesh forming the next layer located inside is followed by the plain weave wire mesh located in the outermost layer. It moves one after another, and the sliding with the heat-resistant material containing expanded graphite and the surface of plain woven wire mesh is always sliding with the counterpart material, Since it is avoided, the occurrence of abnormal frictional noise can be prevented as much as possible.

DESCRIPTION OF SYMBOLS 1 Vertical line 2 Horizontal line 3 Mesh 4 Plain woven wire mesh 5, 10 Parallel side 6, 11, 18, 46, 53, 60, 63, 69 Inclined side 7a, 7b, 7c, 7d Intersection 8 Parallelogram shape plain woven wire mesh 12 Expanded graphite sheet 13 Polymerized sheet 16, 17, 43, 44, 45, 59 Surface 19, 47 Composite sheet 20, 49, 62, 65, 68 Cylindrical molded body 36 Through hole 37 Cylindrical inner surface 38 Partially convex spherical outer surface 39, 40 Annular end surface 41 Ball-shaped seal body 42 Heat-resistant material 48 Superposition part 61, 64 Composite sheet 52 Cylindrical base material 54, 70 Outer surface forming member 55, 71 Composite cylindrical molded body 57 Surface 58 Covering layer

Claims (18)

A spherical inner seal body having a cylindrical inner surface, a partially convex spherical outer surface, an annular end surface on the large diameter side and a small diameter side of the partially convex spherical outer surface, and used for an exhaust pipe joint, and having a plurality of rectangular meshes A plain woven wire mesh having a plurality of vertical lines and horizontal lines to be formed and forming a plurality of layers between the partially convex spherical outer surface and the cylindrical inner surface, and disposed between the partially convex spherical outer surface and the cylindrical inner surface; A plain woven wire mesh is filled and a heat-resistant material containing expanded graphite mixed and integrated with the plain woven wire mesh, and the partially convex spherical outer surface forms each mesh in the plain woven wire mesh forming the outermost layer. Of a pair of diagonal lines located on one diagonal line of a pair of diagonal lines connecting the intersection points of adjacent vertical lines and adjacent horizontal lines and of the pair of diagonal lines Located on the other diagonal Both are having a surface of the plain weave wire mesh comprising a surface consisting of the other intersection points arranged circumferentially, the partially convex spherical outer surface, heat filled in meshes of the plain weave wire mesh forming the outermost layer A ball-shaped seal body having a surface made of a material . A spherical inner seal body having a cylindrical inner surface, a partially convex spherical outer surface, an annular end surface on the large diameter side and a small diameter side of the partially convex spherical outer surface, and used for an exhaust pipe joint, and having a plurality of rectangular meshes A plain woven wire mesh having a plurality of vertical lines and horizontal lines to be formed and forming a plurality of layers between the partially convex spherical outer surface and the cylindrical inner surface, and disposed between the partially convex spherical outer surface and the cylindrical inner surface; A plain woven wire mesh is filled and a heat-resistant material containing expanded graphite mixed and integrated with the plain woven wire mesh, and the partially convex spherical outer surface forms each mesh in the plain woven wire mesh forming the outermost layer. Of a pair of diagonal lines located on one diagonal line of a pair of diagonal lines connecting the intersection points of adjacent vertical lines and adjacent horizontal lines and of the pair of diagonal lines Located on the other diagonal A spherical belt-like seal having a plane of the plain woven wire mesh including a plane composed of the other intersection group arranged in the circumferential direction, and a cylindrical inner surface having a plane composed only of a heat-resistant material including expanded graphite body. A spherical inner seal body having a cylindrical inner surface, a partially convex spherical outer surface, an annular end surface on the large diameter side and a small diameter side of the partially convex spherical outer surface, and used for an exhaust pipe joint, and having a plurality of rectangular meshes A plain woven wire mesh having a plurality of vertical lines and horizontal lines to be formed and forming a plurality of layers between the partially convex spherical outer surface and the cylindrical inner surface, and disposed between the partially convex spherical outer surface and the cylindrical inner surface; A plain woven wire mesh is filled and a heat-resistant material containing expanded graphite mixed and integrated with the plain woven wire mesh, and the partially convex spherical outer surface forms each mesh in the plain woven wire mesh forming the outermost layer. Of a pair of diagonal lines located on one diagonal line of a pair of diagonal lines connecting the intersection points of adjacent vertical lines and adjacent horizontal lines and of the pair of diagonal lines Located on the other diagonal Both surfaces of the plain weave wire mesh including the surface of the other intersection group arranged in the circumferential direction are provided, and the inner surface of the cylinder has a surface composed of the plain weave wire mesh forming the innermost layer and the mesh of the plain weave wire mesh. A ball-shaped sealing body that is filled with a surface made of a heat-resistant material containing expanded graphite. A spherical inner seal body having a cylindrical inner surface, a partially convex spherical outer surface, an annular end surface on the large diameter side and a small diameter side of the partially convex spherical outer surface, and used for an exhaust pipe joint, and having a plurality of rectangular meshes A plain woven wire mesh having a plurality of vertical lines and horizontal lines to be formed and forming a plurality of layers between the partially convex spherical outer surface and the cylindrical inner surface, and disposed between the partially convex spherical outer surface and the cylindrical inner surface; A plain woven wire mesh is filled and a heat-resistant material containing expanded graphite mixed and integrated with the plain woven wire mesh, and the partially convex spherical outer surface forms each mesh in the plain woven wire mesh forming the outermost layer. Of a pair of diagonal lines located on one diagonal line of a pair of diagonal lines connecting the intersection points of adjacent vertical lines and adjacent horizontal lines and of the pair of diagonal lines Located on the other diagonal Both have a plane of the plain weave wire mesh that includes a surface composed of the other intersection point group arranged in the circumferential direction, and the large-diameter-side annular end surface includes a surface composed of one and the other intersection point group of the plain weave wire mesh A spherical belt-like seal body comprising a plain woven wire mesh surface and a surface made of a heat-resistant material containing expanded graphite and filled with the plain woven wire mesh. 5. The spherical belt-shaped sealing body according to claim 1, wherein the cylindrical inner surface has a surface made of only a heat-resistant material containing expanded graphite. The cylindrical inner surface includes a surface made of a plain woven wire mesh forming an innermost layer, and a surface made of a heat-resistant material containing expanded graphite and filled in the mesh of the plain woven wire mesh. Sphere-shaped seal body. 7. A solid lubricant is further provided, and the partially convex spherical outer surface is provided with a surface made of a solid lubricant filled in a mesh of a plain weave wire mesh forming the outermost layer. The spherical belt-shaped sealing body according to one item. The ball-shaped seal body according to claim 7, wherein the solid lubricant contains a tetrafluoroethylene resin, a tetrafluoroethylene-hexafluoropropylene copolymer, and a hexagonal boron nitride. The composition ratios of the tetrafluoroethylene resin, tetrafluoroethylene-hexafluoropropylene copolymer and hexagonal boron nitride in the solid lubricant are tetrafluoroethylene resin, tetrafluoroethylene-hexafluoropropylene copolymer and hexagonal crystal. In the ternary composition diagram of boron nitride, a composition point of 10% by mass of tetrafluoroethylene resin, 10% by mass of tetrafluoroethylene-hexafluoropropylene copolymer and 80% by mass of hexagonal boron nitride, tetrafluoroethylene resin 10 mass%, composition point of 45 mass% tetrafluoroethylene-hexafluoropropylene copolymer and 45 mass% hexagonal boron nitride, 45 mass% tetrafluoroethylene resin, tetrafluoroethylene-hexafluoropropylene copolymer 45 Composition points of 10% by mass and hexagonal boron nitride 10% by mass Numerical range corresponding to a region bounded by a quadrangle whose apex is a composition point of 40% by mass of tetrafluoroethylene resin, 10% by mass of tetrafluoroethylene-hexafluoropropylene copolymer and 50% by mass of hexagonal boron nitride. The spherical belt-shaped sealing body according to claim 8, which is inside. The composition ratios of the tetrafluoroethylene resin, tetrafluoroethylene-hexafluoropropylene copolymer and hexagonal boron nitride in the solid lubricant are tetrafluoroethylene resin, tetrafluoroethylene-hexafluoropropylene copolymer and hexagonal crystal. In the ternary composition diagram of boron nitride, the composition point of 25% by mass of tetrafluoroethylene resin, 15% by mass of tetrafluoroethylene-hexafluoropropylene copolymer and 60% by mass of hexagonal boron nitride, tetrafluoroethylene resin 12 mass%, composition point of tetrafluoroethylene-hexafluoropropylene copolymer 28 mass% and hexagonal boron nitride 60 mass%, tetrafluoroethylene resin 10 mass%, tetrafluoroethylene-hexafluoropropylene copolymer 40 4% by mass and a composition point of hexagonal boron nitride 50% by mass, Composition point of ethylene fluoride resin 20% by mass, tetrafluoroethylene-hexafluoropropylene copolymer 40% by mass and hexagonal boron nitride 40% by mass, tetrafluoroethylene resin 38% by mass, tetrafluoroethylene-hexafluoropropylene A composition point of 22% by mass of copolymer and 40% by mass of hexagonal boron nitride, 35% by mass of tetrafluoroethylene resin, 15% by mass of tetrafluoroethylene-hexafluoropropylene copolymer and 50% by mass of hexagonal boron nitride; The spherical belt-shaped sealing body according to claim 8, which is in a numerical range corresponding to a region bounded by a hexagon having a composition point as a vertex. The solid lubricant according to claim 9 or 10, wherein the solid lubricant further contains alumina hydrate at a ratio of 20% by mass or less. The ball-shaped seal body according to any one of claims 7 to 11, wherein the solid lubricant is unfired. The ball-shaped seal body according to any one of claims 7 to 11, wherein the solid lubricant is baked. The surface of the plain weave wire mesh including the surface composed of one and the other intersection group of the plain weave wire mesh on the partially convex spherical outer surface has an area ratio of 10 to 60% with respect to the entire partially convex spherical outer surface. The spherical belt-shaped sealing body according to any one of 13. The ball-shaped seal body according to any one of claims 1 to 14, wherein the heat-resistant material contains a phosphate in a proportion of 0.1 to 16% by mass. The ball-shaped seal body according to any one of claims 1 to 15, wherein the heat-resistant material contains phosphorus pentoxide in a proportion of 0.05 to 5 mass%. One of a pair of diagonal lines connecting the intersections of adjacent vertical lines and adjacent horizontal lines forming each mesh in a plain woven wire mesh that is a layer following the outermost layer and forming at least a layer adjacent to the outermost layer. The one intersection group located on the diagonal line is arranged in the axial direction, and the other intersection group located on the other diagonal line of the pair of diagonal lines is arranged in the circumferential direction. The spherical belt-shaped sealing body according to any one of 1 to 16. In the plain woven wire mesh forming the innermost layer from the outermost layer, one intersection group located on one diagonal line of a pair of diagonal lines connecting the intersection points of adjacent vertical lines and adjacent horizontal lines forming each mesh is The other group of intersections arranged in the axial direction and located on the other diagonal line of the pair of diagonal lines is arranged in the circumferential direction. Sphere-shaped seal body.

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