JPS62218110A - Manufacture of member for sealing exhaust pipe joint section - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] a1 Objective of the Invention (Industrial Application Field) The sealing member for an exhaust pipe joint produced by the manufacturing method of the present invention dissipates exhaust gas emitted from an automobile engine into the atmosphere. The end of the exhaust pipe for L
+ S ata Miya R "Today; entering λ 7's 4 Hiroshi Kogu Rh) ^" 11 This is to prevent the information from leaking.

(Prior Art) Exhaust gas discharged from an automobile engine is released into the atmosphere through a long exhaust pipe provided along the underfloor. An exhaust purifier and a muffler are installed in the middle of the exhaust pipe to detoxify harmful components contained in the exhaust gas and attenuate noise components.

Engine vibrations are transmitted to the exhaust pipe, which has one end connected to the exhaust port of the engine, which vibrates when the engine rotates, but if these vibrations are transmitted to the entire exhaust pipe, the exhaust purifiers and mufflers, which are relatively heavy, will become bulky. This is undesirable because the vibration may damage the connection between the exhaust pipe and these devices, or cause abnormal noise under the floor.

For this reason, conventionally, a vibration-proof joint 1 as shown in FIG. 3 has been provided in the middle of the exhaust pipe near the engine to prevent engine vibrations from being transmitted directly to the entire exhaust pipe. This anti-vibration joint 1 has two exhaust pipe elements 2 and 3 to be connected.
A holder 5 having a flange-like shape as a whole and having a spherical receiving surface 4 on the opposite side from the exhaust pipe element 2 is fixed to the end of one of the exhaust pipe elements 2, and the other end of the exhaust pipe element 3 is fixed. on the receiving surface 4 of the above-mentioned receiver 5.
An annular sealing member 7 having a sliding surface 6 in close contact with the flange piece 8 is fixed. A bolt 10110 inserted from the side opposite to the flange piece 8 into a through hole 9.9 drilled in a portion closer to the outer periphery than the receiving surface 4 of the receiver 5 is inserted into a screw hole 11.9 provided in a portion closer to the outer periphery of the flange piece 8. 11 and fixed with lock nuts 12 and 12, each bolt 1
．． A compression spring 14.14 is provided between the head 13.13 of the 0, 10 and the receiver to press the sliding surface 6 of the sealing member 7 against the receiving surface 4 of the receiver 5.

The exhaust pipe elements 2 and 3 connected to each other by such an anti-vibration joint 1 can be freely displaced in the direction in which the connecting portion is bent by sliding the receiving surface 4 and the sliding surface 6 against each other. Even if the vibration is transmitted to one exhaust pipe element 2, this vibration will not be directly transmitted to the other exhaust pipe element 3.

By the way, in order to effectively prevent vibrations from being transmitted from one exhaust pipe element 2 to the other exhaust pipe element 3 with the vibration-proof joint 1 configured and operated in this way, it is necessary to adjust the sliding surface of the sealing member 7. 6 must slide on the receiving surface 4 of the receiver 5 with a light force.

For this reason, sealing members 7 made of various materials have been used or proposed.

Among these, the sealing member disclosed in Japanese Patent Publication No. 58-21144 is a sealing member in which a band-shaped refractory material 15 made of graphite or the like and a wire mesh 16 are aligned as shown in FIG. As shown, it is wound into a cylindrical shape and press-molded in a mold to form a sealing member 7 as shown in FIG. During this press molding, the refractory material is evenly filled into the inside of the mesh of the wire mesh that is the core material.

However, in the conventional sealing member manufactured by winding a sheet-shaped refractory material and press-forming it as described above, the refractory material is not completely integrated even after press-forming. Sheet-like refractory material tends to peel off.

A seal-like member for an exhaust pipe joint and a method for manufacturing the same that eliminates such inconveniences are disclosed in Japanese Patent Application No. 59-204077. The sealing member for the exhaust pipe joint according to the present invention is entirely annular and has a sliding surface that makes close sliding contact with the spherical receiving surface of the vibration-proof exhaust pipe joint, and is made of stockinette knitted wire mesh. It is made by press-molding expanded graphite powder as a core material.

When manufacturing the sealing material according to the earlier invention as described above, as shown in FIG.
Wire mesh 2 wound into a cylindrical shape with expanded graphite particles 19.19 inside.
0 and fits tightly into the molding space 18.
1, the expanded graphite particles 19, 19 and the wire mesh 20 are pressed toward the bottom of the molding space 18, the expanded graphite particles are brought into close contact with each other, and the individual particles are crushed to form an annular sealing member 7 integrally. Form into. At this time, in order to cover the surface of the sealing member 7 after molding with graphite and to prevent the wire mesh from being exposed on the surface of the sealing member 7 as much as possible, it is necessary to A small amount of expanded graphite particles 19 and 19 are placed in the space 18, and then a cylindrical wire mesh 20 is inserted into the space 18. After inserting the gold w420 into the space 18 in this way, this wire mesh 2
It is preferable to fill the molding space 18 with expanded graphite particles 19 and 19 until the 0 is completely hidden.

Once the molding space 18 is filled with a sufficient amount of expanded graphite particles 19,19, the male die 21 is then inserted into the molding space 1.
8 and insert the wire mesh 20 and expanded graphite particles 19 described above into
．． 19 toward the bottom of the molding space 18.

(Problems to be Solved by the Invention) However, when a sealing member is manufactured by the method according to the previous invention as described above, the following disadvantages occur.

That is, if the wire mesh 16 wound into a cylindrical shape is simply placed in the molding space 18 of the female mold 17 as shown in FIG.
Not only will the density of the expanded graphite particles filled in the female mold 17 together with the wire mesh 16 become non-uniform, but also when the expanded graphite particles filled in the female mold 17 together with the wire mesh 16 are press-molded, Part of the wire mesh 16 is the 8th
As shown in the figure, the wire mesh deforms so that it sticks to each other, and the adhesion in this area becomes poor, making it easy to peel off. In addition, the density of the wire mesh as a core material becomes uneven. A portion of the wire mesh 16 may be exposed on the surface of the sealing material, deteriorating the sealing performance, or the strength of the portions of the wire mesh where the density is low may be insufficient.

In the specification of the earlier invention, as shown in FIGS. 9 and 10,
When the wire mesh 16 is formed into a wave shape in a direction perpendicular to the winding direction and inserted into the molding space 18 of the female mold 17, the metal I! A method is also shown in which expanded graphite particles are evenly filled in the molding space 18 located on the outer and inner circumferential sides of 416. Even when a wire mesh formed in the above is press-molded together with expanded graphite particles, the wire mesh may deform so that parts of the wire mesh 16 are in close contact with each other, as shown in FIG. 11, and may easily peel off. Disadvantages still exist.

The method for manufacturing a sealing member for an exhaust pipe joint of the present invention involves forming a waveform on a wire mesh placed in a female mold together with expanded graphite particles, which is inclined with respect to the moving direction of a male mold that presses the wire mesh during press molding. This solves the above-mentioned inconvenience.

b. Structure of the invention (means for solving the problem) The method for manufacturing a sealing member for an exhaust pipe joint according to the present invention is different from the method for manufacturing a sealing member for an exhaust pipe joint according to the earlier invention. Similarly, expanded graphite particles and a cylindrical wire mesh are inserted into a molding space with an annular cross section in the upper opening formed in the female mold, and then a male mold with a circular cross section is pushed into the molding space. A sealing member is produced by press-molding expanded graphite particles and a wire mesh between the lower surface of the male mold and the inner surface of the molding space of the female mold.

In the method for manufacturing a sealing member for an exhaust pipe joint of the present invention, gold 1i41 is placed in a female mold together with expanded graphite particles.
6 is formed into a waveform as shown in FIG. 2, and this waveform is characterized by being inclined at 20 to 90 degrees, more preferably 30 to 70 degrees with respect to the direction of movement of the male die. .

The expanded graphite particles placed in the female mold together with the wire mesh having such an inclined waveform are the same as those used in the sealing member of the previous invention described above, and the graphite particles are placed in the female mold in the absence of an adhesive. It is an expanded version, for example, the
No. 3966.

These expanded graphite particles have a small bulk density (e.g. o, ooa
~0.40 g/c), and when press-molded, the volume decreases significantly and the individual particles interlock with each other and solidify as one piece. Therefore, in the case of a sealing member made by press-molding expanded graphite particles using a wire mesh as a core material, the expanded graphite particles are integrally bonded to each other through the holes of the wire mesh, and sufficient strength can be obtained.

In particular, in the case of the sealing member manufactured by the manufacturing method of the present invention, since the wire mesh serving as the core material of expanded graphite is inclined with respect to the pressing direction (the direction of movement of the male mold), the male mold 2 As it enters the molding space 18 of the female mold 17, the wire mesh 16 is crushed uniformly, and the wire mesh 16 is placed inside the completed sealing member after pressing is completed, as shown in FIG. It will appear to exist evenly.

It should be noted that up to 50% by weight of Teflon powder can be added to the expanded graphite particles as a friction reducing agent, and that the expanded graphite particles 19.19 can be added to the expanded graphite particles in an amount of up to 50% by weight as a friction reducing agent.
In order to efficiently fill the
It is effective to apply fine vibrations to the molding space 18 of the female mold 17, and the expanded graphite particles 19.19 to be integrally molded by pressing are used as they are, commercially available expanded graphite particles. Alternatively, a sheet of expanded graphite commercially available as NIKA FILM (trade name of Nippon Carbon Co., Ltd.) can be crushed into granules and used. Wire mesh 1, which serves as the core material, can be used by crushing the attached expanded graphite.
The points other than the shape of 6 are completely the same as in the case of the previous invention.

C1 Effects of the Invention The method for manufacturing a sealing member for an exhaust pipe joint according to the present invention is configured as described above, but since the expanded graphite particles stick together and become integral after press molding, conventional graphite The graphite does not peel off like when press forming a sheet, and the wire mesh, which is the core material of the expanded graphite, is uniformly present inside the sealing member, so a part of the wire mesh is used for sealing. There is no risk of deterioration of sealing performance due to exposure to the surface of the component, or lack of strength in areas where the density of the wire mesh is low, or even peeling of the sealant in areas where the density of the wire mesh is too high. .

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a seal-like member manufactured by the manufacturing method of the present invention, Fig. 2 is a perspective view showing the state before press molding of the wire mesh used as the core material of this seal member, and Fig. 3 is Cross-sectional view of the exhaust pipe joint incorporating the sealing member, No. 4~
Fig. 6 shows an example of a conventional sealing member, Fig. 4 is a perspective view showing the wire mesh and refractory material before forming, and Fig. 5 is a plan view showing the state in which they are rolled into a cylindrical shape prior to forming. Fig. 6 is a partially cutaway perspective view showing the state after molding, Fig. 7 is a half longitudinal sectional view showing the state in which the sealing member according to the earlier invention is manufactured, and Fig. 8 is a partially cutaway perspective view showing the state after molding. The first sealing member made
A sectional view showing an example, FIG. 9 is a perspective view of a wire mesh formed in a wave shape in a direction perpendicular to the winding direction, FIG. The figure is a sectional view showing a sealing member made using this wire mesh as a core material. 1: Anti-vibration joint, 2.3: Exhaust pipe element, 4: Reception surface, 5: Receptacle, 6: Sliding surface, 7: Seal member, 8: Flange piece, 9
: Through hole, 10: Bolt, 11: Screw hole, 12: Lock nut, 13: Head, 14: Compression spring, 15: Fireproof material, 1
6: wire mesh, 17: female mold, 18: molding space, 19: expanded graphite particles, 21: male mold. Patent Applicant Nippon Reinz Co., Ltd. Agent Kinzo Koyama (and 1 other person) Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] Expanded graphite particles and a cylindrical wire mesh are inserted into a molding space with an annular cross section in the upper opening formed in the female mold, and then a male mold with a circular cross section is pushed into the molding space. In a method for manufacturing a sealing member for an exhaust pipe joint in which expanded graphite particles and a wire mesh are press-molded between the lower surface and the inner surface of the molding space of the female mold, the wire mesh is 9
A method for manufacturing a sealing member for an exhaust pipe joint, which is characterized by a wire mesh formed in a corrugated shape inclined at 0 degrees.