JP2008267356A - Mounting structure for exhaust system ball joint gasket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrict the turn of an exhaust system ball joint gasket and prevent occurrence of chattering noise or the like. <P>SOLUTION: In this mounting structure for the exhaust system ball joint gasket, non-sliding part at an outer circumference side of the exhaust system ball joint gasket 1 is fitted in a metal cylinder 2 as one unit, and a hooking part 3 projectingly provided on the metal cylinder is hooked on a flange MF provided on an exhaust system end part pipe or a fastening member B installed on the flange. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mounting structure for an exhaust system ball joint gasket used in an exhaust system of a vehicle engine or the like.

  The exhaust system ball joint gasket is used by being inserted into the exhaust system exhaust manifold (exhaust manifold) such as a vehicle engine or the end pipe of the catalytic converter. At that time, the inner periphery of the exhaust system ball joint gasket is used. If the tightening force between the pipe and the pipe is weak, the exhaust system ball joint gasket rotates in the circumferential direction of its end pipe due to the swinging motion that has a rotational moment when it works to absorb displacement, and excessive wear occurs. May occur, or the clearance between the exhaust system ball joint gasket and the end pipe thereof may increase to generate chattering noise or the like.

Conventionally, the following structures are known as a structure for solving such a problem.
1. An R-shaped protrusion is provided on the inner diameter of the ball joint gasket.
As shown in FIG. 21A and an enlarged view of FIG. 21B, an exhaust pipe as the end pipe is formed by forming an R-shaped protrusion 1a on the inner diameter portion of the exhaust system ball joint gasket 1. When attached to the pipe MP, the tip of the projection 1a is attached while being deformed when the exhaust manifold MP is inserted, and the clearance between the exhaust system ball joint gasket 1 and the exhaust manifold MP is eliminated.

2. Press-fit the ball joint gasket into the exhaust pipe.
As shown in FIG. 22A and an enlarged view of FIG. 22B, the exhaust system ball joint gasket 1 has a negative tolerance with respect to the outer diameter of the exhaust manifold MP, and the exhaust system ball joint gasket 1 1 is press-fitted into an exhaust manifold MP fixed to the exhaust manifold flange MF. At that time, a layer 1b formed of a stainless mesh is provided on the inner peripheral portion of the exhaust system ball joint gasket 1 to facilitate press-fitting.

3. The inner periphery of the ball joint gasket and the inner periphery of the exhaust pipe are polygonal and elliptical.
As shown in FIG. 23 (a), the inner periphery of the exhaust system ball joint gasket 1 is formed into a polygon, an ellipse, an ellipse, or the like, which cannot be rotated, as shown in FIG. 22 (b). In addition, the outer peripheral portion of the exhaust manifold MP is subjected to tube reduction processing to an equivalent similar shape.

  However, each of the conventional structures has the following problems. That is: In the structure in which the R-shaped protrusion is provided on the inner diameter portion of the ball joint gasket, the tightness of the R-shaped protrusion 1a on the inner diameter portion of the exhaust system ball joint gasket 1 to the exhaust pipe MP is small, and it is used for a long time in the exhaust system of an automobile. As a result, the R-shaped protrusion 1a is almost eliminated and has a rotational moment. Further, the exhaust system ball joint gasket 1 rotates with respect to the swinging motion, and excessive wear occurs. Further, when used in a high-temperature environment or in a high-frequency vibration region, the R-shaped protrusion 1a is worn away and a large clearance is generated between the exhaust system ball joint gasket 1 and the exhaust manifold MP. Productivity such as quietness may be deteriorated.

  2. In the structure in which the ball joint gasket is press-fitted into the exhaust manifold, there are problems in terms of economy (such as an increase in price), such as an increase in the assembly process for press-fitting the gasket into the exhaust manifold. Further, when a press-fitting tool such as a compressed air impact tool is used, there is a risk that the exhaust manifold EM is damaged. Furthermore, it is necessary to process the inner diameter dimension of the exhaust system ball joint gasket 1 and the outer dimension of the exhaust manifold MP with high accuracy, which causes problems in manufacturing technology and quality control. In addition, the exhaust system ball joint gasket 1 undergoes an irreversible expansion phenomenon with respect to the temperature rise, and the press-fitting allowance of the exhaust system ball joint gasket 1 is reduced when used at a high temperature for a long time. It may not be obtained (see the left column in Table 1 below).

  3. In the structure in which the inner peripheral part of the ball joint gasket and the inner peripheral part of the exhaust pipe are polygonal and elliptical, the exhaust system ball joint gasket 1 having the inner peripheral polygon is positioned to be inserted into the outer peripheral polygonal exhaust pipe MP. Advanced assembly technology such as matching is required, which is not suitable for industrially assembling automobiles. In addition, forming the inner circumference of the exhaust system ball joint gasket 1 into a highly accurate polygon has a high manufacturing difficulty such as management of the amount of spring back after compression processing. Furthermore, in the case of a mounting structure using a combination of a polygon or an ellipse, it is effective in preventing the exhaust system ball joint gasket 1 from rotating, but a clearance between the exhaust system ball joint gasket 1 and the exhaust pipe MP is generated. Therefore, no effect can be expected in reducing chatter noise.

  The present invention has been made in order to advantageously solve the above-mentioned problems. The exhaust system ball joint gasket mounting structure according to the present invention is such that the non-sliding portion on the outer peripheral side of the exhaust system ball joint gasket is a metal cylinder. The engaging portion that is integrally fitted and protruded from the metal cylinder is engaged with a flange provided on the exhaust system end pipe or a fastening member attached to the flange.

  According to the exhaust ball joint gasket mounting structure of the present invention, when the vibration has a rotational moment when the engine rolls or when the vibration is input from the road surface while the vehicle is running, the exhaust system ball joint gasket is connected to the end of an exhaust pipe or the like. However, the non-sliding part on the outer peripheral side of the exhaust system ball joint gasket protrudes into a metal cylinder that is integrally fitted by, for example, press-fitting or fitting structure. Since the engaging portion provided is engaged with a flange provided on the exhaust system end pipe or a fastening member attached to the flange, rotation of the exhaust system ball joint gasket is restricted.

  Even if there is a clearance between the exhaust system ball joint gasket and the end pipe, the exhaust system ball joint gasket is attached to the flange provided on the exhaust system end pipe or its flange via a metal cylinder. Since it is engaged with the fastening member, the occurrence of minute repeated displacement of the exhaust system ball joint gasket due to the swing input is restrained, and chatter noise and the like can be prevented.

  Since the outer periphery of the exhaust system ball joint gasket is fitted to the metal cylinder, the exhaust system ball joint gasket undergoes irreversible thermal expansion with respect to temperature rise when subjected to a thermal load, thereby A decrease in the tightening force of the cylindrical gasket is suppressed. Further, even when the engine is stopped and the outside air temperature is reached, the tightening force is maintained by the irreversible thermal expansion of the exhaust system ball joint gasket.

  Furthermore, according to the mounting structure of the exhaust system ball joint gasket of the present invention, in addition to the gasket fixing characteristics described above, the metal cylinder covers the outer peripheral exposed part other than the sliding part of the exhaust system ball joint gasket. There is also an effect that the salt corrosion resistance of the exhaust system ball joint gasket can be improved against splash exposure while the vehicle is running. Furthermore, by folding back the outer end of the hooking portion protruding from the metal cylinder to serve as a splash cover that covers more than half of the metal cylinder, it is possible to further improve the salt corrosion resistance of the exhaust system ball joint gasket it can.

  Stainless steel plates, cold-rolled steel plates, plated steel plates, brass plates, and aluminum alloy plates are suitable for the material of the metal cylinder. When exposed to a high temperature environment of 400 ° C. or higher, stainless steel plates SUS304, SUS316L, SUS310S. And SUS430 is suitable, and when the temperature environment is relatively low, a brass plate or an aluminum alloy plate can also provide a sufficient effect. The thickness of the metal plate is preferably 0.2 mm to 1.0 mm.

  The metal cylinder can be formed into an arbitrary cylinder by deep drawing of the above metal plate, precision welding such as laser welding of a strip-shaped metal plate, or pipe expansion processing of a metal thin plate pipe, The metal plate can be provided by firmly joining the metal plate by precision welding, brazing or the like.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1A and 1B are a front view showing an embodiment of an exhaust system ball joint gasket mounting structure according to the present invention and a cross-sectional view taken along the line A-A, FIG. (B) is the front view and sectional drawing which show the state which applied the attachment structure of the exhaust system ball joint gasket of the Example to an exhaust manifold.

  In the mounting structure of the exhaust system ball joint gasket of this embodiment, the non-sliding portion on the outer peripheral side of the exhaust system ball joint gasket 1 is integrally fitted into the metal cylinder 2 by light press fitting, and projects into the metal cylinder 2. Here, the bolt holes 3a respectively provided in the two tongue-shaped engaging portions 3 are mounted on the exhaust flange MF provided in the exhaust manifold MP at the end of the exhaust manifold EM as the exhaust system end pipe. The two bolts B as fastening members are engaged with each other.

  These bolts B are formed by pressing a flare flange FF provided at the end of the exhaust pipe EP with a spring S against a sliding portion on the outer peripheral side of the exhaust system ball joint gasket 1 mounted on the exhaust manifold MP. In order to make the sliding contact, the spring is held by being fastened to the exhaust manifold MF.

  FIG. 3 is a sectional view showing another embodiment of an exhaust system ball joint gasket mounting structure according to the present invention, and FIG. 4 shows a state where the exhaust system ball joint gasket mounting structure of the embodiment is applied to an exhaust pipe. FIG.

  In the mounting structure of the exhaust system ball joint gasket of this embodiment, the non-sliding portion on the outer peripheral side of the exhaust system ball joint gasket 1 is integrally fitted into the metal cylinder 2 by light press fitting, and projects into the metal cylinder 2. Here, the bent portions 3b provided in the three tongue-shaped engaging portions 3 extend along the outer shape of the exhaust manifold flange MF provided in the exhaust manifold MP, and are formed on the outer peripheral surface of the exhaust manifold flange MF. Each is closely related.

  FIGS. 5A and 5B are a front view and a sectional view showing a state in which still another embodiment of the exhaust ball joint gasket mounting structure of the present invention is applied to an exhaust manifold.

  In the mounting structure of the exhaust system ball joint gasket of this embodiment, the non-sliding portion on the outer peripheral side of the exhaust system ball joint gasket 1 is integrally fitted into the metal cylinder 2 by light press fitting, and projects into the metal cylinder 2. Here, the two bolt holes 3a respectively provided in the substantially disc-shaped engaging portion 3 are engaged with the two bolts B mounted on the exhaust manifold flange MF, and the substantially disc-shaped engaging portion 3 is provided. The folded portion 3c provided at the outer end of the metal cover 3/4 or more of the metal cylinder 2 serves as a splash cover. The exhaust manifold flange MF is provided with a tongue-like projection P for connecting the vehicle body of the vehicle and the exhaust manifold flange MF, and the folded-back portion 3c is formed so as to avoid the tongue-like projection P.

  According to the exhaust ball joint gasket mounting structure of the embodiment shown in FIGS. 1 and 2, when the vibration has a rotational moment when the vibration is input from the road surface while the engine is running or the vehicle is running, the exhaust ball The joint gasket 1 receives a frictional reaction force that tries to rotate in the circumferential direction of the exhaust pipe MP, but a hooking portion 3 that protrudes from a metal cylinder 2 fitted with the exhaust system ball joint gasket 1 by press-fitting, for example, Since it is engaged with the bolt B mounted on the exhaust manifold flange MF, the rotation of the exhaust system ball joint gasket 1 is restricted.

  Further, even if there is a clearance between the exhaust system ball joint gasket 1 and the exhaust manifold MP, the exhaust system ball joint gasket 1 is attached to the exhaust manifold flange MF provided on the exhaust manifold MP via the metal cylinder 2. Since it is engaged with the bolt B, the occurrence of minute repeated displacement of the exhaust system ball joint gasket 1 due to the swing input is restrained, and chatter noise and the like can be prevented.

  Further, since the outer periphery of the exhaust system ball joint gasket 1 is fitted to the metal cylinder 2, the exhaust system ball joint gasket 1 undergoes irreversible thermal expansion with respect to temperature rise when subjected to a thermal load. And the fall of the gasket tight force of the metal cylinder 2 is suppressed. Further, even when the engine is stopped and the outside air temperature is reached, the tension force is maintained by the irreversible thermal expansion of the exhaust system ball joint gasket 1 (see the right column of Table 1).

  FIG. 6 is a block diagram showing test equipment for a hot endurance fluctuation test of the exhaust system ball joint gasket mounting structure of the embodiment shown in FIG. 1 and FIG. 2, and here, it is discharged from the kerosene burner BN. The combustion gas G passes through the exhaust manifold EM and the exhaust system ball joint gasket 1 and is sequentially sent to the catalytic converter CC, the prechamber PC and the silencer SC via the exhaust pipe EP, and is exhausted to the outside from the silencer SC. The exhaust pipe EP, the pre-chamber PC and the silencer SC in front of the catalytic converter CC in the exhaust system are floatingly supported by the lifting jig HT via the rubber mount RM, and the exhaust manifold EM Support frame SF Is swingably supported is swung by a hydraulic swivel SM via the crank C.

  FIG. 7 shows a mounting structure of the exhaust system ball joint gasket of the embodiment shown in FIGS. 1 and 2 and FIG. 21 as a comparative example under the conditions shown in Table 2 below using the test equipment shown in FIG. FIG. 23 is an explanatory diagram showing a result of a hot rocking durability test performed on the conventional mounting structure shown in FIG. In FIG. 7, the left end shows the mounting structure of FIG. 21, the center shows the mounting structure of FIG. 22, and the right end shows the mounting structure of the above embodiment.

  Also from the results shown in FIG. 7, the above-described effects of the mounting structure of the above embodiment are clear. 3 and FIG. 4 and the embodiment shown in FIG. 5 are also presumed to have the same effect.

  In addition to the fixing characteristics of the gasket described above, the metal cylinder 2 covers the outer peripheral exposed part other than the sliding part of the exhaust system ball joint gasket 1, so that the exhaust system ball joint gasket against splash exposure while the vehicle is running. 1 salt corrosion resistance can also be improved.

  FIG. 8 shows an exhaust system ball joint gasket mounting structure of the embodiment shown in FIGS. 1 and 2, an exhaust system ball joint gasket mounting structure of the embodiment shown in FIG. 5, and FIG. 22 as a comparative example. FIG. 9 is an explanatory diagram showing a method for measuring the corrosion depth of a gasket after the corrosion resistance test. FIG. 9 is an explanatory diagram showing test conditions when a corrosion resistance test is performed on the conventional mounting structure shown.

  That is, as shown in FIG. 8, the corrosion resistance test was performed under the condition of combining 500 ° C. hot rocking and salt spray + drying, and the corrosion resistance was evaluated in three cycles. Hot rocking is temperature = 500 ° C., rocking angle = 2.5 °, rocking speed = 8 Hz, and 3.0E + 05 times (12 hr). Salt water corrosion is temperature = 80 ° C. After spraying in the form of a mist, the process of holding for 3 hr and then drying at 100 ° C. for 1 hr was repeated 3 cycles. As shown in Fig. 9, the gasket corrosion depth is measured by cutting and polishing the gasket after completion of the test, then observing the cross section with a metal microscope and starting from the reinforced metal wire (mesh) where corrosion has occurred. The distance up to is the corrosion depth.

  FIG. 10 is an explanatory diagram showing the results of a corrosion resistance test performed under the above test conditions and measurement method. 10, the left end shows the mounting structure of FIG. 22, the center shows the mounting structure of the embodiment of FIGS. 1 and 2, and the right end shows the mounting structure of the embodiment of FIG.

  From the results shown in FIG. 10, it is clear that the mounting structure of the embodiment shown in FIGS. 1 and 2 has better corrosion resistance than the conventional structure. Moreover, it is estimated that the Example shown in FIG. 3 and FIG. 4 also has the same effect. And it became clear that the Example shown in FIG. 5 is more excellent in corrosion resistance.

  FIG. 11 shows an example of a metal cylinder 2 provided with two tongue-shaped engaging portions 3 having bolt holes 3a, which can be used in the mounting structure of the exhaust system ball joint gasket of the embodiment shown in FIGS. FIGS. 12A to 12C are explanatory views showing a method of manufacturing the metal cylinder 2 shown in FIG.

  That is, here, it is assumed that the metal cylinder 2 is produced by deep drawing from the raw material plate 4 of the material SUS304 having a thickness of 0.5 t, and the inner diameter portion is formed using the flat raw material plate 4 cut into a predetermined shape. I do. As shown in FIGS. 12 (a) and 12 (b), the forming method at that time is a deep drawing of the raw material original plate 4 by setting a flat raw material plate 4 on a press die 5 and pressing the punch 6 down. After the deep drawing process, as shown in FIG. 12 (c), the piercing die 7 is used to punch out the cylindrical top plate portion of the raw material plate 4, and the tongue-shaped engaging portion 3 The excess surrounding part is cut off to form the metal cylinder 2 with the flange 2a. At the same time, the bolt hole 3a of the tongue-shaped hook 3 is also blanked, and finally the tongue-shaped hook 3 is bent. Then, two tongue-shaped engaging portions 3 having bolt holes 3a are formed as projecting metal cylinders 2. The inner diameter dimension of the metal cylinder 2 manufactured by the above-described deep drawing process has a tolerance of ± 0.05 mm or less, so that highly accurate and stable processing can be performed.

  FIG. 13 shows a metal cylinder 2 having two tongue-shaped engaging portions 3 with bolt holes 3a protruding therefrom, which can be used in the exhaust ball joint gasket mounting structure of the embodiment shown in FIGS. FIGS. 14A to 14F are explanatory views showing a method of manufacturing the metal cylinder 2 shown in FIG.

  That is, here, the strip-shaped raw material plate 4 is cut from the raw material plate 4 of the material SUS304 having a thickness of 0.5 t, and the strip-shaped raw material plate 4 is used by using a bending roll BR as shown in FIG. 14 (b), the strip-shaped raw material plate 4 is fixed along the cylindrical jig CT, and the joint portion 2b is integrated by laser welding or plasma welding, as shown in FIG. The metal cylinder 2 is produced as shown in FIG. Next, as shown in the side view and the front view in FIGS. 14 (e) and 14 (f), the bolt hole 3a is blanked with a piercing die and the end 3d is bent into the metal cylinder 2 in advance. The tongue-shaped hooking portion 3 bent in step 2 is integrally fixed to an arbitrary portion of the metal cylinder 2 by spot welding, plasma welding, or laser welding, so that two tongue-shaped portions having bolt holes 3a are formed. The engaging portion 3 is a protruding metal cylinder 2. The inner diameter of the metal cylinder 2 produced by this welding process has a tolerance of ± 0.05 mm or less, so that highly accurate and stable processing can be performed.

(Example using SUS304, metal cylinder by 0.5t deep drawing)
15A and 15B are a front view and a side view showing the material of the exhaust system ball joint gasket 1 used in still another embodiment of the exhaust system ball joint gasket mounting structure of the present invention. These are the perspective views which show the metal cylinder 2 by which the two tongue-shaped engaging parts 3 with the bolt hole 3a were projectedly used for the Example.

  In this embodiment, as shown in FIGS. 15 (a) and 15 (b), expanded graphite sheets 1c and SUS304 demister mesh 1d are alternately stacked and wound in a sawtooth shape, and compressed in a mold, An exhaust system ball joint gasket 1 having a spherical sliding portion on the side and a cylindrical non-sliding portion or a cylindrical non-sliding portion which also forms a part of a spherical surface connected thereto, and a cylindrical inner peripheral portion is provided. The non-sliding part on the outer peripheral side of the exhaust system ball joint gasket 1 is press-fitted into a metal cylinder 2 produced by deep drawing SUS304 0.5t plate material as shown in FIGS. After that, as shown in FIG. 2 (b), the exhaust system ball joint gasket 1 is inserted into the exhaust manifold pipe MP on the exhaust manifold side, and the flare flange FF is set on the sliding portion. Rare flange FF with fastening by spring S in the exhaust manifold flange MF, tongue-shaped engaging portion 3 of the metal cylinder 2, concluded two locations in the exhaust manifold flange MF with bolts B for fixing the spring 2.

  The mounting structure of this example was subjected to a hot swing durability test under the test conditions shown in Table 3 below, and the rotation prevention effect of the metal cylinder 2 was verified.

  The slip torque, which is the tightening force of the ball joint gasket 1 after the hot rocking durability test, showed a favorable result of 31.8 N · m. In addition, during the hot rocking endurance test, there was no occurrence of abnormal vibration noise due to gasket chattering, etc., and stable gasket mounting was maintained.

(Example using metal cylinder by SUS430, 0.4t precision welding process)
FIG. 17 is a perspective view showing a metal cylinder 2 provided with three tongue-like engaging portions 3 having bent portions 3b, which is used in still another embodiment of the exhaust system ball joint gasket mounting structure of the present invention. It is.

  In this embodiment, as shown in FIGS. 15 (a) and 15 (b), expanded graphite sheets 1c and SUS304 demister mesh 1d are alternately stacked and wound in a sawtooth shape, and compressed in a mold, An exhaust system ball joint gasket 1 having a spherical sliding portion on the side and a cylindrical non-sliding portion or a cylindrical non-sliding portion which also forms a part of a spherical surface connected thereto, and a cylindrical inner peripheral portion is provided. The non-sliding portion on the outer peripheral side of the exhaust system ball joint gasket 1 was cut into a strip shape of SUS430 in the same manner as shown in FIGS. 13 and 14, and then YAG laser welding. After press-fitting into the metal cylinder 2 as shown in FIG. 17 where the joint portion 2b is welded and the three tongue-like engaging portions 3 are fixed, as shown in FIG. 2 (b), the exhaust system ball joint gasket 1 The inner peripheral portion is inserted through the exhaust manifold pipe MP of Ekimaniria side sets a flared flange FF in the sliding portion, it entered into a flared flange FF at the spring S in the exhaust manifold flange MF. At that time, in order to prevent rotation of the exhaust system ball joint gasket 1, as shown in FIG. 4, the bent portion 3 b of the tongue-like engagement portion 3 provided on the metal cylinder 2 is engaged with the outer periphery of the exhaust manifold MF at three locations ( The exhaust system ball joint gasket 1 was fixed to the exhaust manifold flange MF.

  The mounting structure of this example was subjected to a hot swing durability test under the test conditions shown in Table 4 below to verify the effect of preventing rotation of the metal cylinder 2.

  The slip torque, which is the tightening force of the ball joint gasket after the hot rocking durability test, showed a good result of 33.8 N · m. In addition, during the hot rocking endurance test, there was no occurrence of abnormal vibration noise due to gasket chattering, etc., and stable gasket mounting was maintained.

(Example using a metal cylinder by deep drawing of aluminized steel sheet)
FIG. 18 is a perspective view showing a metal cylinder 2 provided with two tongue-like engaging portions 3 having bolt holes 3a, which is used in still another embodiment of the exhaust system ball joint gasket mounting structure of the present invention. It is.

  In this embodiment, as shown in FIGS. 15 (a) and 15 (b), expanded graphite sheets 1c and SUS304 demister mesh 1d are alternately stacked and wound in a sawtooth shape, and compressed in a mold, An exhaust system ball joint gasket 1 having a spherical sliding portion on the side and a cylindrical non-sliding portion or a cylindrical non-sliding portion which also forms a part of a spherical surface connected thereto, and a cylindrical inner peripheral portion is provided. The non-sliding portion formed on the outer peripheral side of the exhaust system ball joint gasket 1 is formed into a metal cylinder 2 made by deep drawing a 0.5 t plate material of an aluminized steel plate as shown in FIGS. 2 (b), the inner peripheral portion of the exhaust system ball joint gasket 1 is inserted into the exhaust manifold MP on the exhaust manifold side, and a flare flange FF is set in the sliding portion. And, with fastening the flare flange FF in the exhaust manifold flange MF at the spring S, the tongue-shaped engaging portion 3 of the metal cylinder 2, concluded two locations in the exhaust manifold flange MF with bolts B for fixing the spring 2.

  The mounting structure of this example was subjected to a hot swing durability test under the test conditions shown in Table 5 below, and the rotation prevention effect of the metal cylinder 2 was verified.

  The slip torque, which is the tight force of the ball joint gasket after the hot rocking endurance test, showed a good result of 30.8 N · m. In addition, during the hot rocking endurance test, there was no occurrence of abnormal vibration noise due to gasket chattering, etc., and stable gasket mounting was maintained.

(Example using brass plate, metal cylinder by brazing of 0.6t)
FIG. 19 is a perspective view showing a metal cylinder 2 provided with two tongue-like engaging portions 3 having bolt holes 3a, which is used in yet another embodiment of the exhaust ball joint gasket mounting structure of the present invention. It is.

  In this embodiment, as shown in FIGS. 15 (a) and 15 (b), expanded graphite sheets 1c and SUS304 demister mesh 1d are alternately stacked and wound in a sawtooth shape, and compressed in a mold, An exhaust system ball joint gasket 1 having a spherical sliding portion on the side and a cylindrical non-sliding portion or a cylindrical non-sliding portion which also forms a part of a spherical surface connected thereto, and a cylindrical inner peripheral portion is provided. After molding, the non-sliding portion on the outer peripheral side of the exhaust system ball joint gasket 1 is cut into a strip shape by cutting a 0.6 ton of C2801 brass plate in the same manner as shown in FIGS. After the joint portion 2b is joined at 3 and the three tongue-like hooking portions 3 are fixed by brazing joining, the metal cylinder 2 as shown in FIG. 19 is press-fitted, and then the exhaust as shown in FIG. Ball join The inner peripheral portion of the gasket 1 is inserted into the exhaust manifold pipe MP on the exhaust manifold side, a flare flange FF is set on the sliding portion, the flare flange FF is fastened to the exhaust manifold MF with a spring S, and the metal cylinder 2 The tongue-shaped engaging portion 3 was fastened to the exhaust manifold flange MF at two locations together with the bolt B for fixing the spring 2.

  The mounting structure of this example was subjected to a hot swing durability test under the test conditions shown in Table 6 below, and the rotation prevention effect of the metal cylinder 2 was verified.

  The slip torque, which is the tightening force of the ball joint gasket 1 after the hot rocking durability test, showed a favorable result of 26.2 N · m. In addition, during the hot rocking endurance test, there was no occurrence of abnormal vibration noise due to gasket chattering, etc., and stable gasket mounting was maintained.

(Example using aluminum plate, metal cylinder by 0.5t deep drawing)
FIG. 20 is a perspective view showing a metal cylinder 2 provided with two tongue-like engagement portions 3 having bolt holes 3a, which is used in still another embodiment of the exhaust system ball joint gasket mounting structure of the present invention. It is.

  In this embodiment, as shown in FIGS. 15 (a) and 15 (b), expanded graphite sheets 1c and SUS304 demister mesh 1d are alternately stacked and wound in a sawtooth shape, and compressed in a mold, An exhaust system ball joint gasket 1 having a spherical sliding portion on the side and a cylindrical non-sliding portion or a cylindrical non-sliding portion which also forms a part of a spherical surface connected thereto, and a cylindrical inner peripheral portion is provided. The non-sliding portion formed on the outer peripheral side of the exhaust system ball joint gasket 1 is formed into a metal cylinder 2 made by deep drawing a 0.5 ton plate material of an A5052 aluminum plate as shown in FIGS. 2 (b), the inner peripheral portion of the exhaust system ball joint gasket 1 is inserted into the exhaust manifold MP on the exhaust manifold side, and the flare flange FF is inserted into the slide portion. Set, with fastening the flare flange FF in the exhaust manifold flange MF at the spring S, the tongue-shaped engaging portion 3 of the metal cylinder 2, concluded two locations in the exhaust manifold flange MF with bolts B for fixing the spring 2.

  The mounting structure of this example was subjected to a hot swing durability test under the test conditions shown in Table 7 below, and the effect of preventing rotation of the metal cylinder 2 was verified.

  The slip torque, which is the tightening force of the ball joint gasket 1 after the hot rocking durability test, showed a good result of 25.9 N · m. In addition, during the hot rocking endurance test, there was no occurrence of abnormal vibration noise due to gasket chattering, etc., and stable gasket mounting was maintained.

  Although the present invention has been described above based on the illustrated examples, the present invention is not limited to the above-described examples, and can be appropriately changed within the scope of the claims. The fitting method between the non-sliding portion on the outer peripheral side of the exhaust system ball joint gasket and the metal cylinder may be fitting by fitting between uneven portions instead of light press fitting. Further, the exhaust system ball joint gasket itself is not limited to the configuration of the above example.

  Thus, according to the mounting structure of the exhaust system ball joint gasket of the present invention, when the vibration has a rotational moment at the time of engine roll or vibration input from the road surface while the vehicle is running, the exhaust system ball joint gasket can be There is a frictional reaction force that tries to rotate in the circumferential direction of the end pipe, but there is a hooking part protruding from a metal cylinder fitted integrally with the non-sliding part on the outer peripheral side of the exhaust system ball joint gasket. Since it is engaged with a flange provided on the exhaust system end pipe or a fastening member attached to the flange, rotation of the exhaust system ball joint gasket can be restricted.

  Even if there is a clearance between the exhaust system ball joint gasket and the end pipe, the exhaust system ball joint gasket is attached to the flange provided on the exhaust system end pipe or its flange via a metal cylinder. Since it is engaged with the fastening member, it is possible to restrain the occurrence of chattering noise by restraining the occurrence of minute repeated displacement of the exhaust system ball joint gasket due to the swing input.

  Since the outer periphery of the exhaust system ball joint gasket is fitted to the metal cylinder, the exhaust system ball joint gasket undergoes irreversible thermal expansion with respect to temperature rise when subjected to a thermal load, thereby It is possible to suppress a decrease in the cylindrical gasket tightening force, and it is possible to maintain the tightening force by the irreversible thermal expansion of the exhaust system ball joint gasket even when the engine is stopped and the outside air temperature is reached.

  Furthermore, according to the mounting structure of the exhaust system ball joint gasket of the present invention, in addition to the gasket fixing characteristics described above, the metal cylinder covers the outer peripheral exposed part other than the sliding part of the exhaust system ball joint gasket. There is also an effect that the salt corrosion resistance of the exhaust system ball joint gasket can be improved against splash exposure while the vehicle is running. Furthermore, by folding back the outer end of the hooking portion protruding from the metal cylinder to serve as a splash cover that covers more than half of the metal cylinder, it is possible to further improve the salt corrosion resistance of the exhaust system ball joint gasket it can.

(A), (b) is the front view which shows one Example of the attachment structure of the exhaust system ball joint gasket of this invention, and sectional drawing which follows the AA line. (A), (b) is the front view and sectional drawing which show the state which applied the attachment structure of the exhaust system ball joint gasket of the said Example to the exhaust manifold. It is sectional drawing which shows another Example of the attachment structure of the exhaust system ball joint gasket of this invention. It is a front view which shows the state which applied the attachment structure of the exhaust system ball joint gasket of the said Example to the exhaust pipe. (A), (b) is the front view and sectional drawing which show the state which applied another one Example of the attachment structure of the exhaust system ball joint gasket of this invention to the exhaust pipe. It is a block diagram which shows the test equipment of the hot endurance rocking | fluctuation test of the attachment structure of the exhaust system ball joint gasket of the Example shown in the said FIG. 1 and FIG. 6 using the test equipment shown in FIG. 6 under the conditions shown in Table 1 below, the exhaust system ball joint gasket mounting structure of the embodiment shown in FIG. 1 and FIG. It is explanatory drawing which shows the result of having done the hot oscillation endurance test about the conventional attachment structure shown, respectively. The exhaust system ball joint gasket mounting structure of the embodiment shown in FIGS. 1 and 2, the exhaust system ball joint gasket mounting structure of the embodiment shown in FIG. 5, and the conventional mounting shown in FIG. 22 as a comparative example. It is explanatory drawing which shows the test conditions at the time of performing a corrosion resistance test about a structure. It is explanatory drawing which shows the method of the corrosion depth measurement of the gasket after the said corrosion resistance test. It is explanatory drawing which shows the result of having performed the corrosion resistance test on the said test conditions and the measuring method. It is a perspective view which shows an example of the metal cylinder which protruded and provided the two tongue-shaped engaging parts with a bolt hole which can be used for the attachment structure of the exhaust system ball joint gasket of the Example shown in the said FIG. 1 and FIG. (A)-(c) is explanatory drawing which shows the manufacturing method of the metal cylinder shown in the said FIG. FIG. 3 is a perspective view showing another example of a metal cylinder projecting two tongue-shaped engaging portions having bolt holes, which can be used for the exhaust system ball joint gasket mounting structure of the embodiment shown in FIGS. 1 and 2. is there. (A)-(f) is explanatory drawing which shows the manufacturing method of the metal cylinder shown in the said FIG. (A), (b) is the front view and side view which show the raw material of the exhaust system ball joint gasket used for another Example of the attachment structure of the exhaust system ball joint gasket of this invention. It is a perspective view which shows the metal cylinder which protruded the two tongue-shaped engaging part with a bolt hole used for the said Example. It is a perspective view which shows the metal cylinder which projected three tongue-shaped engaging parts with a bending part used for another one Example of the attachment structure of the exhaust system ball joint gasket of this invention. It is a perspective view which shows the metal cylinder which protruded the two tongue-shaped engaging parts with a bolt hole used for another one Example of the attachment structure of the exhaust system ball joint gasket of this invention. FIG. 6 is a perspective view showing a metal cylinder 2 provided with two tongue-like hooking portions having bolt holes, which is used in still another embodiment of the exhaust system ball joint gasket mounting structure of the present invention. It is a perspective view which shows the metal cylinder which protruded the two tongue-shaped engaging parts with a bolt hole used for another one Example of the attachment structure of the exhaust system ball joint gasket of this invention. (A), (b) is a top view of the gasket which shows an example of the attachment structure of the conventional exhaust system ball joint gasket, and the top view which expands the part and shows with an exhaust manifold. (A), (b) is sectional drawing which shows another example of the attachment structure of the conventional exhaust system ball joint gasket, and the top view which expands and shows a part. (A), (b) is the top view of the gasket which shows another example of the attachment structure of the conventional exhaust system ball joint gasket, and the top view of an exhaust pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exhaust system ball joint gasket 1a R-shaped protrusion 1b Stainless steel mesh forming layer 1c Expanded graphite sheet 1d Demister mesh 2 Metal cylinder 2a Flange 2b Joint part 3 Engagement part 3a Bolt hole 3b Bending part 3c Folding part 3d
4 Raw material plate 5 Die 6 Punch 7 Pierce type B Bolt BN Kerosene burner BR Bending roll C Crank CC Catalytic converter CT Cylindrical jig EM Exhaust manifold EP Exhaust pipe FF Flare flange G Combustion gas HT Suspension jig MF Exhaust manifold pipe MP Nut P Tongue projection PC Prechamber RM Rubber mount S Spring SC Silencer SF Support frame SM Hydraulic rocker

Claims (6)

The non-sliding part on the outer peripheral side of the exhaust system ball joint gasket is integrally fitted to the metal cylinder,
A mounting structure for an exhaust system ball joint gasket, in which a hook portion projecting from the metal cylinder is engaged with a flange provided on an exhaust system end pipe or a fastening member attached to the flange.   The exhaust system ball joint gasket mounting structure according to claim 1, wherein the non-sliding portion on the outer peripheral side of the exhaust system ball joint gasket is integrally fitted into the metal cylinder by press fitting.   3. The exhaust ball joint gasket mounting structure according to claim 1, wherein the plate material forming the metal cylinder is a stainless steel plate, a cold-rolled steel plate, a plated steel plate, a brass plate, or an aluminum alloy plate.   4. The metal cylinder according to claim 1, wherein the metal cylinder is formed by deep drawing of a metal plate, precision welding of ends of a strip-shaped metal plate rounded into a cylindrical shape, or pipe expansion of a metal thin plate pipe. The mounting structure of the exhaust system ball joint gasket as described above.   The exhaust system ball joint gasket mounting structure according to any one of claims 1 to 4, wherein the metal plate forming the fitting portion is joined to the metal cylinder by precision welding or brazing.   6. The exhaust system ball joint gasket according to any one of claims 1 to 5, wherein the metal plate forming the fitting portion has, at its outer end, a folded portion that covers more than half of the metal cylinder as a splash cover. Construction.

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