JP5924369B2 - Sphere-shaped sealing body and method for manufacturing the same - Google Patents

Description

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

  For example, JP-A-54-76759, JP-A-6-123362, JP-A-10-9396, and JP-A-10-9397 are known as spherical belt-like sealing bodies used for spherical pipe joints of automobile exhaust pipes. Various proposals have been made in publications and the like.

  All of the proposed ball-shaped seals can reduce the manufacturing cost compared to the bellows type joint and are excellent in durability, but these are both heat-resistant materials made of expanded graphite and the like. The ratio of the reinforcing material to the heat-resistant material is formed by compressing the reinforcing material made of the wire mesh and filling the mesh of the reinforcing material with the heat-resistant material and integrating the heat-resistant material and the reinforcing material together, In addition to the problem of exhaust gas leakage through the ball-shaped seal body itself depending on the degree of compression of the heat-resistant material and reinforcing material, abnormal noise is generated due to the presence of the heat-resistant material on the partially convex spherical surface that slidably contacts the counterpart material. For example, if the ratio of the reinforcing material to the heat-resistant material is too large, or if the degree of pressurization to the heat-resistant material is low, sealing with the heat-resistant material against the micro-path generated around the reinforcing material In addition to causing the initial leakage by reducing the degree of There is a risk of early exhaust gas leakage due to oxidative consumption of the heat-resistant material at high temperatures, and the heat-resistant material on the partially convex spherical surface is heavily pressurized, or the heat-resistant material against the reinforcing material on the partially convex spherical surface When the exposure ratio is extremely large, stick slip may be caused and abnormal noise may be generated.

  The present invention has been made in view of the above-mentioned points. The object of the present invention is to eliminate the leakage of exhaust gas through the ball-shaped seal body itself, to eliminate the generation of abnormal noise, and to be stable. An object of the present invention is to provide a ball-shaped seal body having a sealing property and a method for manufacturing the same.

The ball-shaped seal body according to the first aspect of the present invention has an annular sliding surface, and at least a heat-resistant material and a reinforcing material made of a wire mesh are compressed, and the heat-resistant material is filled in the mesh of the reinforcing material. The seal body includes a seal body in which the heat-resistant material and the reinforcing material are mixed and integrated. Here, the seal body includes 15 to 80% by weight of the reinforcing material and 20 to 85% of the heat-resistant material. are in a ratio of weight percent, the heat-resistant material in the seal body has a density of 2.00 g / cm ³ from 1.20 g / cm ^3.

  In many cases, the seal body, in which heat-resistant materials and reinforcing materials made of wire mesh are mixed and integrated, contains more than 80% by weight of reinforcing material and less than 20% by weight of heat-resistant material. As a result of the fact that sealing (filling) with a heat-resistant material is not completely performed with respect to a large number of minute passages (gap) generated around the reinforcing material, initial leakage of exhaust gas is caused, and provisional sealing with respect to minute passages is accidentally completed. Even if such, the sealing disappears early due to oxidative consumption of the heat-resistant material at a high temperature, thus leading to an early exhaust gas leakage, while the reinforcing material is less than 15% by weight and heat-resistant. If the material is contained in a proportion higher than 85% by weight, the reinforcing material is extremely small in the vicinity of the annular sliding surface and the annular sliding surface, and the reinforcement to the heat resistant material in the vicinity of the annular sliding surface and the annular sliding surface is not preferable. Whilst on the peeling of the heat-resistant material occurs noticeably, reinforcing effect by the reinforcing member is hardly expected.

In the above seal body, if the heat-resistant material is not strongly compressed at the manufacturing stage and the density of the heat-resistant material is less than 1.20 g / cm ³ , a micro-cavity is generated in the heat-resistant material over a long period of use, which is entirely As a result of spreading, while causing leakage of exhaust gas, if the heat-resistant material has a density greater than 2.00 g / cm ³ because it is extremely strongly compressed in the manufacturing stage, there is almost no transfer of the appropriate heat-resistant material to the counterpart material. As a result, the difference between the coefficient of dynamic friction and the coefficient of static friction with the counterpart material becomes extremely large.

  In view of the above, the ball-shaped seal body of the first aspect has no leakage of exhaust gas through the seal body itself, and does not generate abnormal noise when sliding with the counterpart material, and has stable sealing characteristics. It will have.

The ball-like seal body of the second aspect of the present invention has an annular sliding surface, and at least a heat-resistant material and a reinforcing material made of a wire mesh are compressed, and the heat-resistant material is filled in the mesh of the reinforcing material. A seal body in which the heat-resistant material and the reinforcing material are mixed and integrated; and a coating layer formed integrally with the outer peripheral surface of the seal body and made of at least a lubricant. An exposed sliding surface forms an annular sliding surface. Here, the seal body and the coating layer have a reinforcing material of 15 wt% to 80 wt%, and a heat resistant material and a lubricant of 20 wt% to 85 wt%. are in a ratio, the heat-resistant material and the lubricating material in the seal body and the coating layer has a density of 2.00 g / cm ³ from 1.20 g / cm ^3.

  Since the spherical belt-shaped sealing body of the second aspect has an annular sliding surface constituted by the exposed surface of the coating layer, further smooth sliding with the mating member in contact with the annular sliding surface is achieved. In addition, as with the ball-shaped seal body of the first aspect, there is no leakage of exhaust gas through the seal body itself, and no noise is generated when sliding with the mating member.

The ball-shaped seal body of the third aspect of the present invention has an annular sliding surface, and at least a heat-resistant material and a reinforcing material made of a wire mesh are compressed, and the heat-resistant material is filled in the mesh of the reinforcing material. A seal body in which a heat-resistant material and a reinforcing material are mixed and integrated, and a reinforcing material made of at least a lubricant, a heat-resistant material, and a wire mesh is compressed and reinforced, and is integrally formed on the outer peripheral surface of the seal body. The metal wire mesh is filled with a lubricant and a heat-resistant material, and has a coating layer in which the lubricant, the heat-resistant material, and the reinforcing material are mixed and integrated. An annular sliding surface is constituted by the exposed surface of the coating layer mixed with the surface to be formed. Here, the seal body and the coating layer are composed of 15 to 80% by weight of a reinforcing material, and a heat-resistant material and a lubricant. It is included at a rate of 20% to 85% by weight, Heat-resistant material and the lubricating material have a density of 2.00 g / cm ³ from 1.20 g / cm ³ in the reel body and the coating layer.

  Since the spherical belt-shaped sealing body of the third aspect has an annular sliding surface constituted by an exposed surface in which a surface made of a reinforcing material of the coating layer and a surface made of a lubricant are mixed, the second aspect As in the case of the spherical belt-shaped seal body, it is possible to ensure further smooth sliding with the mating member in contact with the annular sliding surface, and it is possible to hold the surface made of the lubricant on the exposed surface with the surface made of the reinforcing material. Furthermore, as a result of appropriately performing the transfer of the lubricant from the annular sliding surface to the counterpart material and the scraping of the lubricant transferred to the counterpart material, a smooth sliding over a long period of time can be secured, Similar to the ball-shaped seal body of the first aspect, there is no leakage of exhaust gas through the seal body itself, and no noise is generated when sliding with the mating member.

The ball-like seal body of the fourth aspect of the present invention has an annular sliding surface, and at least a heat-resistant material and a reinforcing material made of a wire mesh are compressed, and the heat-resistant material is filled in the mesh of the reinforcing material. A seal body in which a heat-resistant material and a reinforcing material are mixed and integrated, and a reinforcing material made of at least a lubricant, a heat-resistant material, and a wire mesh is compressed and reinforced, and is integrally formed on the outer peripheral surface of the seal body. The metal wire mesh is filled with a lubricant and a heat-resistant material, and has a coating layer in which the lubricant, the heat-resistant material, and the reinforcing material are mixed and integrated. An annular sliding surface is constituted by the exposed surface of the coating layer mixed with the surface to be formed. Here, the reinforcing material is included in the annular surface layer portion of the ball-shaped seal body from the annular sliding surface to 1 mm from 60% by weight. 75% by weight, 25% by weight of heat-resistant materials and lubricants Included in a proportion of 40 wt%, the reinforcing material in the surface layer portion of the annular, has a density of 5.00 g / cm ³ the heat-resistant material and lubricant from 3.00 g / cm ^3, an annular surface The other annular portion excluding the portion contains the reinforcing material in a proportion of 20% to 70% by weight and the heat-resistant material in a proportion of 30% to 80% by weight.

  The thickness of the coating layer in which the lubricant, the heat-resistant material and the reinforcing material are mixed and integrated in the spherical belt-shaped sealing body may be empirically within 1 mm from the viewpoint of the service life due to the wear, and thus the annular layer If the annular surface layer portion of the ball-shaped seal body from the sliding surface to 1 mm contains less than 60% by weight of the reinforcing material and more than 40% by weight of the heat-resistant material and the lubricant, the surface layer portion It is difficult to sufficiently obtain the effect of the reinforcing material at the surface, and peeling and dropping off at the surface layer portion are likely to occur, while the reinforcing material is more than 75% by weight, and the heat-resistant material and the lubricant are more than 25% by weight. If it is contained in a small proportion, sealing (filling) with a heat-resistant material to a large number of micro passages (gap) generated around the reinforcing material is not completely performed. As a result, initial leakage of exhaust gas through the surface layer portion is prevented. Invite and tentatively fine Also as a sealing against the passage has been made to even people completely disappeared such sealing is early by oxidation loss or the like of the heat-resistant material at high temperatures, leakage of the early exhaust gases may occur Thus.

Further, if the reinforcing material, heat-resistant material and lubricant in the annular surface layer portion have a density smaller than 3.00 g / cm ^3, it will not be strongly compressed in the production stage, and this will be used for long-term use. As a result of the micro-cavity formed in the annular surface layer portion and spreading as a whole, leakage of exhaust gas is caused, while the reinforcing material, the heat-resistant material and the lubricant have a density higher than 5.00 g / cm ^3. If it is, it will be compressed very strongly in the manufacturing stage, transfer of the appropriate heat-resistant material to the counterpart material will hardly occur, and the difference between the dynamic friction coefficient and the static friction coefficient between the counterpart material will be extremely large As a result, abnormal noise is likely to occur during sliding.

  Furthermore, in other annular portions of the ball-shaped seal body excluding the annular surface layer portion, if the reinforcing material is contained in a proportion of less than 20% by weight and the heat-resistant material is contained in a proportion of more than 80% by weight, Reinforcement of the heat-resistant material in the annular portion is not preferably performed, and the heat-resistant material is peeled off remarkably, and it is difficult to expect a reinforcing effect by the reinforcing material, but the reinforcing material is more than 70% by weight and the heat-resistant material is 30%. If it is contained in a proportion less than% by weight, in many cases, sealing (filling) with a heat-resistant material with respect to a large number of minute passages (gap) generated around the reinforcing material will not be completed. Even if the microchannels are completely sealed by chance due to leakage, the sealing disappears early due to oxidative consumption of the heat-resistant material at high temperatures, so that the early exhaust gas Leakage So as to.

Therefore, according to the spherical belt-shaped sealing body of the fourth aspect, the reinforcing material is included in the annular surface layer portion in a proportion of 60% to 75% by weight, and the heat-resistant material and the lubricant are included in a proportion of 25% to 40% by weight. Since the reinforcing material, heat-resistant material and lubricant in the annular surface layer portion have a density of 3.00 g / cm ³ to 5.00 g / cm ³ , the surface layer portion can be peeled off and dropped off. In addition, there is no initial leakage of exhaust gas through the surface layer portion, and it is possible to prevent leakage of exhaust gas not only in the early stage but also in the long term. It can be made not to make sound.

  Further, according to the spherical belt-shaped sealing body of the fourth aspect, the reinforcing material is 20% by weight to 70% by weight and the heat-resistant material is 30% by weight in the other annular portions excluding the annular surface layer portion. To 80% by weight, it is possible to surely prevent the exhaust gas from leaking through the other annular portion, and the heat resistant material is preferably reinforced, and the heat resistant material is preferably peeled off. Can be prevented.

  The ball-like seal body of the fifth aspect of the present invention has an annular sliding surface, and at least a heat-resistant material and a reinforcing material made of a wire mesh are compressed, and the mesh of the reinforcing material wire mesh is filled with the heat-resistant material. A seal body in which a heat-resistant material and a reinforcing material are mixed and integrated, and a reinforcing material made of at least a lubricant, a heat-resistant material, and a wire mesh is compressed and reinforced, and is integrally formed on the outer peripheral surface of the seal body. The metal wire mesh is filled with a lubricant and a heat-resistant material, and has a coating layer in which the lubricant, the heat-resistant material, and the reinforcing material are mixed and integrated. An annular sliding surface is constituted by the exposed surface of the coating layer mixed with the surface to be formed, wherein the coating layer is composed of 60% to 75% by weight of the reinforcing material and 25% by weight of the lubricant and the heat-resistant material. To 40% by weight.

  According to the spherical belt-shaped sealing body of the fifth aspect, similar to the spherical belt-shaped sealing body of the fourth aspect, the covering layer is composed of 60% to 75% by weight of the reinforcing material and 25% by weight of the heat-resistant material and the lubricant. Since it is contained at a ratio of 40% by weight to 40% by weight, it is difficult for the coating layer to peel off and drop off, and it is possible to reliably prevent early and early leakage of exhaust gas through the coating layer.

  The spherical belt-like sealing body of the sixth aspect of the present invention has an annular sliding surface, and at least a heat-resistant material and a reinforcing material made of a wire mesh are compressed, and the heat-resistant material is filled in the mesh of the reinforcing material. A seal body in which a heat-resistant material and a reinforcing material are mixed and integrated, and a reinforcing material made of at least a lubricant, a heat-resistant material, and a wire mesh is compressed and reinforced, and is integrally formed on the outer peripheral surface of the seal body. The metal wire mesh is filled with a lubricant and a heat-resistant material, and has a coating layer in which the lubricant, the heat-resistant material, and the reinforcing material are mixed and integrated. An annular sliding surface is formed by the exposed surface of the coating layer mixed with the surface to be formed. Here, in the annular sliding surface, the surface made of the reinforcing material is 0.5% to 30%, and the surface made of the lubricant is Exposed with 70% to 99.5% area ratio

  In the annular sliding surface, if the surface made of the reinforcing material is less than 0.5% and the surface made of the lubricating material is exposed with an area ratio larger than 99.5%, the annular sliding surface is almost made of the lubricating material. The surface made of the lubricant is easily peeled and dropped off, and the lubricant is transferred from the annular sliding surface to the counterpart material even though it is more than necessary. However, when the surface made of the reinforcing material is exposed more than 30% and the surface made of the lubricant is exposed less than 70%, the effect of the lubricant is reduced. Wear of the mating material that slides relative to the annular sliding surface in a slidable manner becomes remarkable, and smooth sliding cannot be obtained by long-term use.

  Therefore, according to the spherical belt-like seal body of the sixth aspect, it is possible to prevent the surface made of the lubricant on the annular sliding surface from being peeled off, and to be smoothly removed from the counterpart material even in long-term use. In addition to being able to obtain sliding, the generation of abnormal noise can be eliminated.

  In the spherical band-shaped sealing body of each aspect described above, the heat-resistant body preferably contains expanded graphite as in the seventh aspect of the present invention, but the present invention is not limited thereto. For example, in addition to or instead of expanded graphite, one selected from one or more of mica and asbestos may be included.

  In the spherical belt-shaped seal body of each of the above aspects, the annular sliding surface preferably includes a partial convex spherical surface, a partial concave spherical surface, or a frustoconical surface as in the spherical belt-shaped seal body according to the eighth aspect of the present invention. In such a partial convex spherical surface, partial concave spherical surface or frusto-conical surface, the spherical belt-shaped sealing body is slidably in contact with the mating member. Even if it has an outer peripheral surface including an annular sliding surface as in the ball-shaped seal body of the ninth aspect of the present invention, it is annular as in the ball-shaped seal body of the tenth aspect of the present invention. An inner peripheral surface including a sliding surface may be provided.

  The annular sliding surface of the spherical belt-shaped sealing body may be configured to be slidably contacted with the counterpart material as a whole. The annular sliding surface is not limited to one including a partial convex spherical surface, a partial concave spherical surface, or a truncated conical surface, and the curvature center position or the radius of curvature is different. One or more partial convex spherical surfaces or partial concave spherical surfaces or frustoconical surfaces having different degrees of inclination may be included.

  The method of the present invention for manufacturing the spherical belt-shaped sealing body according to any one of the above aspects includes a step of preparing a heat-resistant sheet member containing a heat-resistant material and a reinforcing sheet member made of a wire mesh, and the reinforcing sheet member as a heat-resistant sheet member. The cylindrical base material is formed by winding the polymer into a cylindrical shape, and the cylindrical base material is inserted into the outer peripheral surface of the mold core. And a step of compression molding in the core axial direction.

  In addition, the method of the present invention for producing the spherical belt-shaped sealing body according to any one of the first to ninth aspects described above, after superposing a reinforcing sheet member containing a heat-resistant material on a heat-resistant sheet member made of a wire mesh, A step of winding the polymer into a cylindrical shape to form a tubular base material, another heat-resistant sheet member containing a heat-resistant material, and a lubricant applied to one surface of the other heat-resistant sheet member A pre-cylindrical molded body is formed by winding a covering layer forming member composed of a lubricating layer and another reinforcing sheet member made of a metal mesh disposed on the lubricating layer, with the lubricating layer facing outwards on the outer peripheral surface of the cylindrical base material. And a step of inserting the preliminary cylindrical molded body into the outer peripheral surface of the core of the mold and compressing the preliminary cylindrical molded body in the mold in the core axial direction.

  Furthermore, the method of the present invention for producing the spherical band-shaped sealing body according to any one of the first to eighth and tenth aspects described above includes a heat-resistant sheet member and lubrication applied to one surface of the heat-resistant sheet member. Forming a cylindrical base material by winding a covering layer forming member comprising a lubricating layer containing a material and a reinforcing sheet member made of a metal mesh disposed in the lubricating layer with the surface of the lubricating layer facing inside; A step of superposing another reinforcing sheet member made of the above on another heat-resistant sheet member containing a heat-resistant material and then winding the polymer on the outer peripheral surface of the cylindrical base material to form a preliminary cylindrical molded body, and A step of inserting the preliminary cylindrical molded body into the outer peripheral surface of the core of the mold and compression molding the preliminary cylindrical molded body in the core axial direction in the mold.

  According to the present invention, it is possible to provide a spherical belt-shaped sealing body that can eliminate the leakage of exhaust gas through the spherical belt-shaped sealing body itself, and can eliminate generation of abnormal noise, and a method for manufacturing the same.

FIG. 1 is a longitudinal sectional view showing an example of an embodiment of a ball-shaped seal body of the present invention. FIG. 2 is a perspective view of the heat-resistant sheet member in the manufacturing process of the example of FIG. FIG. 3 is an explanatory diagram of a method for forming a reinforcing sheet member made of a wire mesh in the manufacturing process of the example of FIG. FIG. 4 is a plan view of the cylindrical base material in the manufacturing process of the example of FIG. FIG. 5 is a longitudinal sectional view showing a state in which a cylindrical base material is inserted into a mold in the manufacturing process of the example of FIG. 6 is a longitudinal sectional view of an exhaust pipe spherical joint incorporating the example of FIG. FIG. 7 is a longitudinal sectional view showing another example of the embodiment of the ball-shaped seal body of the present invention. FIG. 8 is a longitudinal sectional view showing still another example of the embodiment of the ball-shaped seal body of the present invention. FIG. 9 is a partially enlarged cross-sectional view of the example shown in FIG. FIG. 10 is a longitudinal sectional view of a heat-resistant sheet member on which a lubricating layer is formed in the manufacturing process of the example shown in FIG. FIG. 11 is an explanatory diagram of a method for forming a coating layer forming member in the manufacturing process of the example shown in FIG. FIG. 12 is an explanatory diagram of a method for forming a coating layer forming member in the manufacturing process of the example shown in FIG. FIG. 13 is a plan view of a preliminary cylindrical molded body in the manufacturing process of the example shown in FIG. FIG. 14 is a longitudinal sectional view showing still another example of the embodiment of the ball-shaped seal body of the present invention. FIG. 15 is a longitudinal sectional view of an exhaust pipe spherical joint incorporating the example of FIG. FIG. 16 is a longitudinal sectional view showing a state in which a cylindrical base material is inserted into a mold in the manufacturing process of the example of FIG. FIG. 17 is a longitudinal sectional view showing a state of compression molding in the manufacturing process of the example of FIG. FIG. 18 is a longitudinal sectional view of an exhaust pipe spherical joint incorporating still another example of the embodiment of the ball-shaped seal body of the present invention. FIG. 19 is a longitudinal sectional view of an exhaust pipe spherical joint incorporating still another example of the embodiment of the ball-shaped seal body of the present invention.

  Hereinafter, the present invention and its embodiments will be described based on preferred examples shown in the drawings. The present invention is not limited to these examples.

In FIG. 1, the ball-shaped seal body 1 of this example includes a heat-resistant material 2 and a reinforcing material 3 made of a wire mesh that are compressed, and the wire mesh of the reinforcing material 3 is filled with the heat-resistant material 2 to reinforce the heat-resistant material 2 and the reinforcing material 3. In this example, the seal body 4 itself has a cylindrical inner peripheral surface 6 that defines the through-hole 5 and a partial protrusion as an annular sliding surface. An outer peripheral surface 10 including the spherical surface 7, in this example, an outer peripheral surface 10 consisting only of the partially convex spherical surface 7, and annular end surfaces 8 and 9 on the large diameter side and the small diameter side of the partial convex spherical surface 7, respectively. Such a seal body 4 includes the reinforcing material 3 in a ratio of 15 to 80% by weight and the heat-resistant material 2 in a ratio of 20 to 85% by weight. It has a density of 20 g / cm ³ to 2.00 g / cm ³ .

  The heat-resistant material 2 containing expanded graphite is formed by pressurizing and compressing an expanded graphite sheet formed with expanded graphite particles as a heat-resistant sheet member. The heat-resistant material 2 may contain other oxidation inhibitors such as phosphorus pentoxide and phosphate as required.

  The reinforcing material 3 is made of stainless steel wire such as austenitic SUS304 or SUS316 or ferritic SUS430, iron wire (JIS-G-3532) or galvanized iron wire (JIS-G-3547), and copper as copper. -Nickel alloy (white copper), copper-nickel-zinc alloy (white and white), brass, weaving using one or more thin wires with a wire diameter of about 0.10 to 0.32 mm made of beryllium copper, It consists of a metal mesh with a mesh of about 3 to 6 mm formed by knitting and compressed and compressed.

  As the reinforcing material 3, in addition to the above-described wire mesh, a notch is cut into a stainless steel sheet or phosphor bronze sheet having a thickness of about 0.3 to 0.5 mm, and at the same time, the notch is expanded to have a regular order of about 3 to 6 mm. A so-called expanded metal having a mesh line of the above may be used as a wire mesh.

  Next, a method for manufacturing the ball-shaped seal body 1 shown in FIG. 1 will be described. First, it is formed by weaving or knitting a strip-shaped heat-resistant sheet member 11 as shown in FIG. 2 made of expanded graphite as the heat-resistant material 2 and cut into a predetermined width and length, and a thin metal wire. A reinforcing sheet member obtained by cutting the wire mesh into a predetermined width (substantially the same as the width of the heat-resistant sheet member) and a predetermined length, or a cylindrical metal mesh 12 formed by knitting fine metal wires as shown in FIG. And 14 is prepared, and a reinforcing sheet member 16 having a predetermined width (substantially the same as the width of the heat-resistant sheet member) is prepared, and the belt-shaped metal mesh 15 is cut into a predetermined length. Next, the heat-resistant sheet member 11 and the reinforcing sheet member 16 are overlapped, and the polymer is spirally wound with the heat-resistant sheet member 11 on the inside so that the heat-resistant sheet member 11 is increased once, As shown in FIG. 4, a cylindrical base material 17 is formed. Furthermore, a cylindrical inner wall surface 21, a partially concave sphere inner wall surface 22 that continues to the cylindrical inner wall surface 21, and a through hole 23 that continues to the partially concave sphere inner wall surface 22, and by inserting a stepped core 24 into the through hole 23, A mold 27 as shown in FIG. 5 in which a hollow cylindrical portion 25 and a spherical hollow portion 26 connected to the hollow cylindrical portion 25 are formed is prepared, and the cylindrical base material 17 is attached to the stepped core 24 of the mold 27. insert. A cylindrical base material 17 positioned in the hollow cylindrical portion 25 and the spherical belt-shaped hollow portion 26 of the mold 27 is compression-molded at a predetermined pressure in the core axial direction, and has a partially convex spherical surface 7 as shown in FIG. A spherical belt-like seal body 1 composed of the seal body 4 is formed.

Then, the thickness of the heat-resistant sheet member 11 to be the heat-resistant material 2, the type of wire rod of the wire mesh to be the reinforcing material 3, the wire diameter, the degree of mesh, the degree of pressure to the cylindrical base material 17, and the like are appropriately selected for reinforcement. 80 wt% wood 3 from 15 wt%, the heat-resistant material 2 is contained in a proportion of 20 wt% to 85 wt%, the heat-resistant material is a density of 2.00 g / cm ³ from 1.20 g / cm ³ A spherical belt-like seal body 1 including the seal body 4 it has can be obtained.

  Such a spherical belt-like seal body 1 is used by being incorporated into an exhaust pipe spherical joint 31 shown in FIG. 6, for example. That is, the flange 34 is fixed to the outer peripheral surface of the upstream side exhaust pipe 32 connected to the engine side by welding or the like, leaving the pipe end 33, and the ball-shaped seal body 1 is attached to the pipe end 33. The inner circumferential surface 6 that defines the through hole 5 is fitted, the spherical belt-like seal body 1 is seated against the flange 34 on the large-diameter side end surface 8, and is opposed to the upstream exhaust pipe 32. The exhaust pipe is connected to the muffler side, and has a concave spherical portion 41 at its end and a flange portion 42 at the periphery of the opening of the concave spherical portion 41, and a downstream exhaust pipe integrally formed with a diameter expanding portion 43 as a counterpart material. 44 is arranged in such a manner that the concave spherical surface portion 41 is slidably brought into contact with the partially convex spherical surface 7 of the ball-shaped seal body 1.

  In the exhaust pipe spherical joint 31 shown in FIG. 6, a pair of bolts 51 having one end fixed to the flange 34 and the other end inserted through the flange portion 42 of the enlarged diameter portion 43 and a huge head and flange of the bolt 51. A spring force is always applied to the downstream exhaust pipe 44 in the direction of the upstream exhaust pipe 32 by the pair of coil springs 52 disposed between the portions 42. The exhaust pipe spherical joint 31 is formed at the partial convex spherical surface 7 of the spherical seal 1 and the end of the downstream exhaust pipe 44 with respect to the relative angular displacement generated in the upper and downstream exhaust pipes 32 and 44. Further, it is configured to allow this by sliding with the concave spherical surface portion 41 of the enlarged diameter portion 43.

The spherical band-shaped sealing body 1 applied to the exhaust pipe spherical joint 31 includes the reinforcing material 3 in a ratio of 15 wt% to 80 wt% and the heat resistant material 2 in a ratio of 20 wt% to 85 wt%. Since the heat-resistant material 2 is composed of the seal body 4 having a density of 1.20 g / cm ³ to 2.00 g / cm ³ , there is no leakage of exhaust gas through the seal body 4 itself, and the concave material is the counterpart material. No noise is generated when sliding with the spherical portion 41.

  In the above description, the ball-shaped seal body 1 is composed of the seal body 4, but the ball-band seal body may be composed of a seal body and a coating layer as shown in FIG. That is, the spherical belt-like sealing body 61 shown in FIG. 7 includes an outer peripheral surface 60 including a partially convex spherical surface 62 as an annular sliding surface, in this example, an outer peripheral surface 60 consisting of only the partial convex spherical surface 62. The main body 4 has a coating layer 63 made of a lubricant and formed integrally with the outer peripheral surface 7 (the aforementioned partial convex spherical surface 7) of the seal body 4, and the partially convex spherical surface is formed by the exposed surface of the coating layer 63. 62 is configured.

  The coating layer 63 is exposed after the lubricant is applied to the outer peripheral surface 7 of the seal body 4 formed in the same manner as described above by brushing, dipping, spraying or the like to a thickness of about 10 to 300 μm and dried. The surface is smooth and formed with a partially convex spherical surface 62 made of such a smooth exposed surface.

  The lubricant as a material for forming the coating layer 63 is mainly composed of polytetrafluoroethylene resin or polytetrafluoroethylene resin, and boron nitride may be added to the main component as necessary. The coating layer 64 is formed by applying John.

  A spherical belt-like sealing body 61 shown in FIG. 7 has a coating layer 63 made of a lubricant on the outer peripheral surface 7 of the seal body 4 and has a partially convex spherical surface 62 constituted by the exposed surface of the coating layer 63. Therefore, when applied to the exhaust pipe spherical joint 31, it is possible to ensure further smooth sliding with the mating member in contact with the partially convex spherical surface 62, and, similar to the ball-shaped seal body 1, the seal body In addition, there is no leakage of exhaust gas through 4 itself, and no noise is generated during sliding with the concave spherical surface portion 41 which is the counterpart material.

The spherical belt shaped sealing body 71 of the present invention may be a spherical belt shaped sealing body 71 as shown in FIGS. 8 and 9 instead of the spherical belt shaped sealing bodies 1 and 61 shown in FIGS. 8 and 9 includes an outer peripheral surface 70 including a partially convex spherical surface 72 as an annular sliding surface, in this example, an outer peripheral surface 70 including only the partial convex spherical surface 72. The main body 4 is integrally formed with the outer peripheral surface 73 of the seal main body 4 (corresponding to the partial convex spherical surface 7 described above but having irregularities) and is made of a lubricant 74, a heat-resistant material 75, and a wire mesh. The reinforcing material 76 is compressed and the mesh 74 of the reinforcing material 76 is filled with the lubricant 74 and the heat-resistant material 75 so that the lubricant 74, the heat-resistant material 75, and the reinforcing material 76 are mixed and integrated. A partially convex spherical surface 72 is constituted by the exposed surface of the covering layer 77 in which the surface 78 made of the reinforcing material 76 and the surface 79 made of the lubricant 74 are mixed, and the seal body 4 and the covering layer 77 have , Reinforcements 3 and 76 from 15% by weight 0% by weight, the heat-resistant materials 2 and 75 and the lubricant 74 are contained in a proportion of 20% to 85% by weight, and the heat-resistant materials 2 and 75 and the lubricant 74 in the seal body 4 and the coating layer 77 are 1 It has a density of 20 g / cm ³ to 2.00 g / cm ³ .

  The manufacturing method of the spherical belt-shaped sealing body 71 shown in FIGS. 8 and 9 will be described next. First, the cylindrical base material 17 as shown in FIG. Next, another heat-resistant sheet member 11 as shown in FIG. 2 is prepared, and an aqueous dispersion containing a polytetrafluoroethylene resin as a lubricant is brushed on one surface of the other heat-resistant sheet member 11. Then, it is coated by means of roller coating, spraying, etc., and dried to form a lubricating layer 80 as shown in FIG. 10, and a reinforcing sheet member 81 comprising a strip-shaped metal mesh 15 as shown in FIG. 3 is prepared separately. As shown in FIG. 11, the heat-resistant sheet member 11 having the lubricating layer 80 is inserted into the reinforcing sheet member 81, and these are integrated between the rollers 82 and 83 as shown in FIG. And another reinforcing sheet comprising a heat-resistant sheet member 11, a lubricating layer 80 containing a lubricant applied to one surface of the heat-resistant sheet member 11, and a wire mesh 12 disposed on the lubricating layer 80. A covering layer forming member 84 made of the material 81 is formed, and the covering layer forming member 84 thus obtained is wound around the outer peripheral surface of the cylindrical base material 17 with the lubricating layer 80 on the outside, as shown in FIG. A preliminarily cylindrical molded body 85 is produced. The pre-cylindrical molded body 85 is placed on the mold 27 in the same manner as described above and compression-molded to obtain a spherical belt-shaped seal body 71.

Then, the thickness of both heat-resistant sheet members 11 to be the heat-resistant materials 2 and 75, the type of wire rod 12 of the wire mesh 12 to be the reinforcing materials 3 and 76, the wire diameter, the degree of mesh, the thickness of the lubricating layer 80, and the preliminary cylindrical molded body 85 By appropriately selecting the degree of pressure, etc., the seal body 4 and the covering layer 77 are provided, and the reinforcing members 3 and 76 are 15 wt% to 80 wt% in the seal body 4 and the covering layer 77. Further, the heat-resistant materials 2 and 75 and the lubricant 74 are contained in a ratio of 20% to 85% by weight, and the heat-resistant materials 2 and 75 and the lubricant 74 in the seal body 4 and the coating layer 77 are 1.20 g / cm. A spherical belt-like sealing body 71 having a density of ³ to 2.00 g / cm ³ can be obtained.

  The spherical belt-like seal body 71 includes a coating layer 77 formed by mixing and integrating a lubricant 74, a heat-resistant material 75, and a reinforcing material 76 on the outer peripheral surface 73 of the seal body 4, and a surface 78 made of the reinforcing material 76. Since the surface 79 made of the lubricant 74 has a partially convex spherical surface 72 constituted by the exposed surface of the covering layer 77 mixed and integrated, the partially convex spherical surface 72 In addition to ensuring further smooth sliding with the concave spherical surface portion 41 that is a contact material, the surface 79 made of the lubricant 74 on the exposed surface can be held by the surface 78 made of the reinforcing material 76. As a result of appropriate transfer of the lubricant 74 from the partially convex spherical surface 72 to the concave spherical surface portion 41 and scraping of the lubricant 74 transferred to the concave spherical surface portion 41, a smooth sliding over a long period can be ensured. And, like the ball-shaped seal body 1, the seal Body 4 no leakage of exhaust gases through itself, becomes no abnormal noise during sliding between the concave spherical portion 41.

Moreover, while using the manufacturing method similar to the spherical belt-shaped sealing body 71, the thickness of both the heat-resistant sheet members 11 to be the heat-resistant materials 2 and 75, the kind of wire rod 12 of the wire mesh 12 to be the reinforcing materials 3 and 76, the wire diameter, and the degree of mesh The thickness of the lubricating layer 80 and the degree of pressure applied to the pre-cylindrical molded body 85 are appropriately selected, and the seal body 4 and the covering layer 77 are provided. In the annular surface layer portion 91 of up to 1 mm, the reinforcing materials 3 and 76 are included in a ratio of 60 wt% to 75 wt%, and the heat resistant materials 2 and 75 and the lubricant 74 are included in a ratio of 25 wt% to 40 wt%. The reinforcing materials 3 and 76, the heat-resistant materials 2 and 75, and the lubricant 74 in the annular surface layer portion 91 have a density of 3.00 g / cm ³ to 5.00 g / cm ³ , and the annular surface layer 91 Ball-like seal excluding part 91 Other annular portion of the reinforcing member 3 with 70 wt% to 20 wt%, the heat-resistant material 2 may be a spherical annular seal member which is included in a proportion of 80 wt% to 30 wt%.

  In such a ball-shaped seal body, the surface layer portion 91 is hardly peeled off or dropped off, and there is no initial leakage of exhaust gas through the surface layer portion 91, and it is possible to eliminate the leakage of exhaust gas not only in the early stage but also in the long term. In addition, it is possible to prevent abnormal noise from sliding when sliding with the concave spherical surface portion 41 which is the counterpart material, and to reliably prevent the exhaust gas from leaking through the other annular portion. The heat-resistant material is preferably reinforced, and the heat-resistant material can be preferably prevented from peeling off.

  Further, the manufacturing method similar to that of the ball-shaped seal body 71 is used, the thickness of another heat-resistant sheet member 11 that becomes the heat-resistant material 75, the type of wire rod 12 of the wire mesh 12 that becomes the reinforcing material 76, the wire diameter, the degree of mesh, the lubricating layer The seal body 4 and the covering layer 77 are appropriately selected by selecting a thickness of 80, etc. The reinforcing layer 76 is 60 wt% to 75 wt% in the covering layer 77, and the lubricant 74 and the heat resistant material 75. May be included in a ratio of 25 wt% to 40 wt%, and in such a ball band seal body, the covering layer 77 is less likely to be peeled off or dropped off, It is possible to reliably prevent the early and early leakage of the exhaust gas passing through.

  In addition, while using the same manufacturing method as the ball-shaped seal body 71, the thickness of another heat-resistant sheet member 11 to be the heat-resistant material 75, the type of wire rod 12 of the wire mesh 12 to be the reinforcing material 76, the wire diameter, the degree of mesh, The thickness and the like of the lubricating layer 80 are appropriately selected, and the seal body 4 and the covering layer 77 are provided. In the partially convex spherical surface 72, the surface 78 made of the reinforcing material 76 is 0.5% to 30%, and lubrication is performed. A spherical band-shaped sealing body in which the surface 79 made of the material 74 is exposed with an area ratio of 70% to 99.5% may be used. In such a spherical band-shaped sealing body, the surface made of the lubricant 74 on the partially convex spherical surface 72. 79 can be prevented from peeling off and falling off, and smooth sliding with the concave spherical surface portion 41 can be obtained even in long-term use.

  By the way, in the above, it is an example of the ball-shaped seal body 1, 61 or 71 provided with the outer peripheral surface 10, 60 or 70 including the partially convex spherical surface 7, 62 or 72 as the annular sliding surface. In the present invention, as shown in FIG. 14, a spherical belt-like seal body 101 having an inner peripheral surface 100 including a frustoconical surface 102 as an annular sliding surface may be used. 14 includes an inner peripheral surface 100 including a cylindrical inner surface 103 connected to the frustoconical surface 102 in addition to the frustoconical surface 102, and a fringe corresponding to the frustoconical surface 102. An outer peripheral surface 106 including a cylindrical outer surface 105 connected to the conical outer surface 104 and the frustoconical outer surface 104, and annular end surfaces 108 and 109 on the large diameter side and the small diameter side of the frustoconical surface 102, respectively. The ball-shaped seal body 1, 61 or 71 is configured in the same manner.

  A spherical belt-like seal body 101 shown in FIG. 14 having an inner peripheral surface 100 including a truncated conical surface 102 as an annular sliding surface is used by being incorporated in an exhaust pipe spherical joint 131 shown in FIG. 15, for example. That is, the flange member 132 is fixed to the outer peripheral surface of the upstream side exhaust pipe 32 connected to the engine side by welding or the like, and the annular surface 134 and the truncated conical surface 135 of the truncated cone portion 133 of the flange member 132. The end surface 109 of the outer peripheral surface 106, the frustoconical outer surface 104, and the cylindrical outer surface 105 are in close contact with the inner peripheral surface 137 including the cylindrical surface 136, and the spherical belt-like seal body 101 is fitted to the outer peripheral surface 106. The convex spherical member 140, which is connected to the muffler side so as to face the upstream exhaust pipe 32 and integrally has the convex spherical portion 138 and the flange portion 139, is welded or the like. The fixed downstream exhaust pipe 44 is disposed so that the convex spherical surface portion 138 is slidably brought into contact with the truncated conical surface 102 of the ball-shaped seal body 101.

  In the exhaust pipe spherical joint 131 shown in FIG. 15, one end is fixed to the flange portion 139, and the other end of the pair of bolts 51 and 51 is disposed through the flange portion 141 of the flange member 132 with a sufficient gap. A spring force is always applied to the downstream exhaust pipe 44 in the direction of the upstream exhaust pipe 32 by the pair of coil springs 52 disposed between the enormous head and the flange portion 141. The exhaust pipe spherical joint 131 is welded to the frustoconical surface 102 of the ball-shaped seal body 101 and the end of the downstream exhaust pipe 44 with respect to the relative angular displacement generated in the upper and downstream exhaust pipes 32 and 44. The convex spherical member 140 fixed by, for example, is allowed to slide with the convex spherical portion 138.

  Since the ball-shaped seal body 101 applied to the exhaust pipe spherical joint 131 is configured in the same manner as the ball-shaped seal body 1, 61 or 71, the same effects as the ball-shaped seal body 1, 61 or 71 are used. Give rise to

  In order to manufacture the ball-shaped seal body 101 shown in FIG. 14 corresponding to the ball-shaped seal body 1 or 61, first, the strip-shaped heat-resistant sheet member 11 as shown in FIG. 2 and the above-mentioned FIG. The reinforcing sheet member 16 is prepared. Next, the heat-resistant sheet member 11 and the reinforcing sheet member 16 are overlapped, and this polymer is spirally wound with the heat-resistant sheet member 11 inside, and the heat-resistant sheet member 11. Is wound so as to increase once, and a cylindrical base material 17 as shown in FIG. 4 is formed. Furthermore, a cylindrical inner wall surface 145, a frustoconical surface 146 that continues to the cylindrical inner wall surface 145, and a circular hole 148 that continues to the frustoconical surface 146 via a step portion 147 are provided, and a stepped core 149 is fitted into the circular hole 148. Thus, a mold 153 as shown in FIG. 16 in which a hollow cylindrical portion 151 and a frustoconical hollow portion 152 connected to the hollow cylindrical portion 151 are formed is prepared, and the stepped core 149 of the mold 153 is prepared. The cylindrical base material 17 is inserted into the hollow cylindrical portion 151 on the outer peripheral surface and attached to the cylindrical inner wall surface 145. After the cylindrical base material 17 is attached to the cylindrical inner wall surface 145, a cylindrical pressing member 162 having a truncated conical surface 161 as shown in FIG. 16 is inserted into the hollow cylindrical portion 151 of the mold 153. Then, as shown in FIG. 17, the cylindrical base material 17 is compression-molded at a predetermined pressure in the core axial direction by the pressing member 162 to form a seal body, and the seal body 1 is used as it is to form the ball-shaped seal body 1. A corresponding spherical belt-like seal body 101 as shown in FIG. 14 is obtained, and a lubricant is applied by brushing, dipping, spraying, etc. on the inner peripheral surface of the seal body obtained after compression molding by the pressing member 162 of the cylindrical base material 17. Then, after drying, the exposed surface of the coating layer is smoothed, and the coating layer is formed with the truncated conical surface 102 made of such a smooth exposed surface, whereby the sphere shown in FIG. band It is possible to obtain a seal member 101.

  In order to manufacture the spherical belt-shaped sealing body 101 shown in FIG. 14 corresponding to the spherical belt-shaped sealing body 71, the coating layer forming member 84 as shown in FIG. A cylindrical base material similar to that of the base material 17 is formed, and another reinforcing sheet member 16 made of a strip-shaped wire mesh as shown in FIG. 3 is added to a heat-resistant material as shown in FIG. After being superposed on the heat-resistant sheet member 11, this polymer is wound around the outer peripheral surface of the cylindrical base material made of the coating layer forming member 84 to form a preliminary cylindrical molded body similar to the preliminary cylindrical molded body 85. Similarly to this, this preliminary cylindrical molded body is inserted into the hollow cylindrical portion 151 at the outer peripheral surface of the stepped core 149 of the mold 153 shown in FIG. As shown in FIG. Obtaining a spherical annular seal member 101 by compression molding at a predetermined pressure in the A-axis direction.

  By the way, in the spherical belt-like seal body 101, the annular sliding surface of the inner peripheral surface 100 is configured by the truncated conical surface 102, and the convex spherical surface portion 138 is slidably brought into contact with a part of one portion of the truncated conical surface 102. However, instead of this, as shown in FIG. 18, the annular sliding surface of the inner peripheral surface 100 is constituted by a partially concave spherical surface 171, and the convex spherical surface portion 138 slides over almost the entire area of the partially concave spherical surface 171. As shown in FIG. 19, the annular sliding surface of the inner peripheral surface 100 is constituted by two connecting truncated conical surfaces 172 and 173, and the truncated conical surfaces 172 and 173 are formed as shown in FIG. 19. The convex spherical surface portion 138 may be slidably contacted partially at two locations.

  The ball-shaped seal body 101 shown in FIGS. 18 and 19 is also configured in the same manner as the ball-shaped seal body 1, 61, or 71, so that the same effect as that of the ball-shaped seal body 1, 61, or 71 is produced. Can do.

DESCRIPTION OF SYMBOLS 1 Sphere-shaped sealing body 2 Heat-resistant material 3 Reinforcement material 4 Seal body 7 Partial convex spherical surface

Claims (1)

It has an annular sliding surface, and at least the heat-resistant material and the reinforcing material made of the wire mesh are compressed, and the heat-resistant material is filled into the mesh of the reinforcing material, and the heat-resistant material and the reinforcing material are mixed and integrated. The seal body is integrally formed on the outer peripheral surface of the seal body, and at least the lubricant and heat-resistant material and the reinforcement made of the wire mesh are compressed, and the mesh of the reinforcement mesh is filled with the lubricant and the heat-resistant material. And a coating layer in which the lubricant, the heat-resistant material, and the reinforcing material are mixed and integrated, and an annular surface is formed by the exposed surface of the coating layer in which the surface made of the reinforcing material and the surface made of the lubricating material are mixed. A ball-shaped seal body having a sliding surface, wherein the seal body includes 15 to 80% by weight of a reinforcing material and 20 to 85% by weight of a heat-resistant material, 1.20 g / cm of heat-resistant material in the seal body ^It has a density of ³ to 2.00 g / cm ³ , and the annular surface layer portion of the ball-shaped seal body from the annular sliding surface to 1 mm has a reinforcing material of 60% to 75% by weight, Lubricant is included at a ratio of 25% to 40% by weight, and the reinforcing material, heat-resistant material and lubricant in the annular surface layer portion have a density of 3.00 g / cm ³ to 5.00 g / cm ^3. A ball-shaped seal body.

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