JP4480806B2 - Metal fine wire string and double exhaust pipe cushion using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a metal fine wire string used for elastically supporting parts related to an exhaust pipe of an automobile engine and a double exhaust pipe using the same.
[0002]
[Prior art]
In recent years, in order to improve the exhaust gas purification level of automobiles using catalytic converters, it has become necessary to increase the heat insulation effect of the exhaust pipe, and a double exhaust pipe has been adopted.
[0003]
In this double exhaust pipe, the inner pipe is exposed to a temperature higher than that of the outer pipe and the thermal expansion increases. Therefore, if both ends of the outer pipe are fixed to the inner pipe by welding, there is a risk of distortion and damage.
[0004]
Therefore, conventionally, the outer pipe is fixed to the inner pipe by welding only at one end of the double exhaust pipe, and as shown in FIG. 5 (A), a heat-resistant metal thin wire a such as a stainless steel fine wire is formed into a cylindrical shape. A ring-shaped cushion b shown in FIG. 5B, which is formed by compressing and molding the outer ring into a ring shape, is interposed between the inner tube and the outer tube at the other end of the double tube. It was designed to absorb the difference in thermal deformation between the outer tube and the outer tube, and to prevent the two tubes from colliding due to vibration.
[0005]
[Problems to be solved by the invention]
However, such a cushion has a problem in that if the diameter of the double exhaust pipe is different, the diameter of the knitted fabric must be changed and the mold for compression molding must be changed, resulting in an increase in cost.
[0006]
[Means, actions and effects for solving the problems]
As means for solving such a problem, the metal fine wire string according to the invention of claim 1 is formed by compression-molding a knitted or woven heat-resistant metal fine wire so as to form a substantially concave cross-section continuous in the longitudinal direction . By cutting to an appropriate length, it can be wound around the inner pipe of a double pipe having an arbitrary diameter, and the cost can be reduced. In addition, a strip-shaped thin metal wire string is used as a buffer material around the exhaust pipe where heat resistance is required, and the metal thin wire string of the present invention is also cut to an appropriate length for these buffer materials. Can be used.
[0007]
The invention of the metal fine wire string according to claim 2 is excellent in elasticity because the heat-resistant metal fine wire knitted into a cylindrical shape is elongated and compression-molded so as to form a substantially concave cross section continuous in the longitudinal direction .
[0008]
The thin metal wire string of the invention of claim 1 or 2 is a thin metal wire string interposed between the first member and the second member, and has a joining surface joined to the first member by welding. the since the surface of the second member side is made of the recess other than the abutting portion and the abutment portion abutting on the second member, for example, recesses in the case of performing spot welding is wound around the inner tube of the double exhaust pipe If the electrode is pressed against the outer tube, the peripheral bulge or hardening caused by spot welding does not occur at the contact part that becomes the sliding surface with the outer tube, and the sliding with the outer tube due to thermal deformation is smooth. Done.
[0009]
Cushion dual exhaust pipe of the invention of claim 3, since the wound so that the bonding surfaces by cutting according to claim 1 or 2 SL placing the fine metal wire made of cord as appropriate length abuts against the outer periphery of the inner tube Since the joint surface and the inner pipe are joined to each other by welding , the metal fine wire string can be used effectively.
[0010]
Since the double exhaust pipe cushion of the invention of claim 4 is limited to spot welding in the invention of claim 3 , the welding operation can be performed quickly.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a manufacturing process of a thin metal wire string according to the present invention, in which a heat-resistant metal thin wire a such as a stainless steel fine wire knitted into a cylindrical shape is flattened and wound in a roll shape, and its feeding end Through a circular die 1 and then squeezed to a high density, and then passed through a corrugating roller 2 to form a corrugated flat shape. After passing through the square die 5 as a cross section, finally, it passes between the lower roller 6 on the smooth outer peripheral surface and the upper roller 7 on which the convex portion 8 is formed at the center of the outer peripheral surface. As shown in an enlarged scale, a thin metal wire string c having an approximately concave concave section with a concave portion d formed in the center is continuously manufactured.
[0012]
FIG. 2 shows a double exhaust pipe 10 in which an inner pipe 11 as a first member is fitted with an outer pipe 12 as a second member, and a reduced diameter portion 12a at one end of the outer pipe 12 is spot welded to the inner pipe 11, The other diameter-reduced portion 12b is fixed to the flange 13 by arc welding.
[0013]
On the outer periphery of the portion of the inner tube 11 corresponding to the reduced diameter portion 12b on the other side of the outer tube 12, the above-mentioned metal fine wire cord c is appropriately cut and wound around the entire circumference, as shown in FIG. As described above, the recess d is fixed by spot welding with an electrode, and is in elastic contact with the inner periphery of the reduced diameter portion 12 b of the outer tube 12.
[0014]
The double exhaust pipe 10 of the present embodiment has the above-described configuration. When high temperature exhaust gas flows through the inner pipe 11 as shown by the arrow, the inner pipe 11 becomes hotter than the outer pipe 12 and is shown in FIG. As shown by the chain line, the metal string c is elongated and the metal string c is moved outward.
[0015]
Next, when the exhaust gas stops flowing due to the stop of the engine, it is cooled and the inner tube 11 contracts, and the thin metal wire string c also returns to the position of the solid line in FIG.
[0016]
Therefore, when the engine is repeatedly operated and stopped, the fine metal wire string c reciprocates while being rubbed against the inner surface of the reduced diameter portion 12b of the outer tube 12, but is pressed by spot welding with the electrode pressed against the recess d. Therefore, the peripheral bulge or hardening due to spot welding does not occur in the abutting portion that becomes the sliding surface with the inner surface of the outer tube 12, and sliding with the outer tube due to thermal deformation is performed smoothly. The inner tube 11 is held elastically for a long period.
[0017]
The thin metal wire string of the present invention can be applied to a buffer material in a portion exposed to a high temperature in addition to the double exhaust pipe of the above embodiment, and is shown in ( B ) to (D) of FIG. As illustrated, various cross-sectional shapes can be selected depending on the application . The figure (A) is not included in the present invention.
[0018]
Moreover, the metal fine wire string of this invention can respond | correspond to the shape of various mating parts by cut | disconnecting to length suitably, and can be provided at low cost compared with a press-formed product.
[0019]
Furthermore, the fine metal wire string of the present invention can be obtained by knitting or weaving a fine metal wire other than knitting.
[Brief description of the drawings]
FIG. 1 is a perspective view of a manufacturing process of an embodiment of a thin metal wire string of the present invention.
FIG. 2 is a cross-sectional view of an embodiment of a double exhaust pipe of the present invention.
FIG. 3 is an enlarged cross-sectional view showing a state in which the metal thin wire string is spot-welded to an inner pipe.
FIG. 4 is various sectional views of the embodiment of the thin metal wire string of the present invention.
5A is a perspective view showing a manufacturing process of a cushion ring using a conventional fine metal wire, and FIG. 5B is a perspective view of the finished product.
[Explanation of symbols]
a: heat-resistant fine metal wire c: fine metal wire d: recess 10: double exhaust pipe 11: inner pipe 12: outer pipe

Claims (4)

A metal thin wire string interposed between the first member and the second member,
The metal fine wire string is formed by compression-molding a heat-resistant metal fine wire that is knitted or woven into a long and narrow cross-section that is continuous in the longitudinal direction ,
A metal having a joining surface joined to the first member by welding, wherein the surface on the second member side includes a contact portion that contacts the second member and a recess other than the corresponding contact portion. Fine wire string. A metal thin wire string interposed between the first member and the second member,
The metal thin wire string is formed by compression-molding a heat-resistant metal thin wire knitted into a cylindrical shape so as to form a substantially concave cross-section continuous in the longitudinal direction ,
A metal having a joining surface joined to the first member by welding, wherein the surface on the second member side includes a contact portion that contacts the second member and a recess other than the corresponding contact portion. Fine wire string. An inner pipe is inserted into the outer pipe, one end of the outer pipe is fixed to the inner pipe, and the other end of the outer pipe is inserted into the gap of the double exhaust pipe having a gap with the inner pipe. In the cushion,
The said thin metal wire string of Claim 1 or 2 is cut | disconnected to length suitably, and is wound so that the said joining surface may contact | abut the outer periphery of the said inner pipe, Then, the said joining surface and the said inner pipe are joined by welding. A double exhaust pipe cushion characterized by intervening in the gap.   4. The double exhaust pipe cushion according to claim 3, wherein the welding is spot welding.

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