JPH0833182B2 - Seal ring and how to assemble it - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The seal ring and its assembling method according to the present invention are
For example, when the flange fixed to the end of the exhaust pipe and the end of the catalytic converter are airtightly connected, or when the end of the exhaust manifold and the flange fixed to the turbocharger or other supercharger are airtightly connected. To use.

(Prior Art) A catalytic converter is provided in the middle of an exhaust pipe for exhausting exhaust gas of an automobile engine to detoxify harmful components contained in the exhaust gas.

The end portion of the exhaust pipe and the end portion of the inlet pipe or the outlet pipe attached to the case of the catalytic converter need to be hermetically connected to each other. The structure shown in Fig.
36953).

That is, the first flange 3 is fixed to the outer peripheral surface of the end of the first pipe 1 of the first and second pipes 1 and 2 to be connected to each other, and the outer periphery of the end of the second pipe 2 is fixed. Second flange 4 on the surface
Is fixed. First flange 3 Second flange 4
In the closed annular locking groove 5 formed as shown in FIG. 5 on the surface facing to, a seal ring 6 as shown in FIG. 6 is partially projected from the locking groove 5. The first and second flanges 3 and 4 are aligned with each other in this state, and the small circular holes 7 and 7 are bored in the first flange 3.
Nuts (not shown) are screwed into bolts (not shown) inserted in the small circular holes 8 and 8 formed in the second flange 4 and the second and third flanges 4, respectively. Four
Are joined together to join the first and second tubes 1 and 2 to each other while maintaining airtightness.

As the seal ring 6, for example, expanded graphite particles, asbestos, or a gasket material 9 as disclosed in Japanese Patent Publication No. 62-105 is wound around a heat-resistant metal thin plate 10 such as stainless steel. A closed annular shape having a shape and size that can be fitted in the locking groove 5 is used.

With the seal ring 6 thus fitted in the locking groove 5 of the first flange 3, a bolt and a nut for joining the first and second flanges 3 and 4 are screwed together and further tightened. In this case, the seal ring 6 is elastically compressed between the first and second flanges 3 and 4 and pushed into the locking groove 5 so that the first and second flanges 3 and 4 face each other. The surfaces are in close contact with each other as shown in FIG.

In such a state, the airtightness between the first and second pipes 1 and 2 is such that a part of the seal ring 6 which is projected from the locking groove 5 formed in the first flange 3 is It is held by being strongly pressed against the second flange 4.

(Problems to be Solved by the Invention) However, when the above-described connecting portion is configured, the following problems occur.

That is, in the case of configuring the connecting portion, the seal ring 6 is assembled in the locking groove 5 formed in the first flange 3 before the first and second flanges 3 and 4 are butted to each other ( It is necessary to insert the seal ring. However, in order to easily perform the associating work of the flanges 3 and 4 with each other, which is subsequent to this assembling work, the seal ring assembled in the engaging groove 5 is required. It is preferable that 6 does not accidentally drop out (do not slip out of the locking groove 5).

On the other hand, in order to facilitate the work of assembling the seal ring 6 into the locking groove 5, the outer diameter a (FIG. 6) of the cross section of the seal ring 6 is set to the above-mentioned locking groove 5. Width dimension b
It must be smaller (a <b) than (Fig. 5).

For this reason, conventionally, the work of assembling the seal ring 6 into the locking groove 5 can be easily performed, but the seal ring 6 once assembled in the locking groove 5 is likely to fall off, and the first operation is performed after the assembling work. When the second flanges 3 and 4 are butted against each other, the butting work must be carried out while holding the seal ring 6 by hand so that the seal ring 6 does not fall out of the locking groove 5, which is troublesome. is there.

The seal ring and the assembling method thereof according to the present invention eliminate the above-mentioned inconvenience.

(Means for Solving the Problems) Among the seal ring and the method of assembling the seal ring of the present invention, the invention of the method for assembling the seal ring is in the form of a true circular lock formed on the flange surface as shown in FIG. Second in groove 5
As shown in FIG. 3 to FIG.
This is a method of assembling an annular seal ring 6 having a width smaller than the width dimension b.

Further, in any of the assembling methods of the invention, the overall shape of the seal ring before assembling is an elliptical shape in which the minor axis and the major axis are slightly different from each other.

In the case of the invention of the assembling method described in claim 1, the minor diameter r (FIGS. 1 and 2) of the inner peripheral edge of the seal ring 6 before the assembling is smaller than the inner diameter l of the engaging groove 5. (For example, when the inner diameter l is 45 mm, 0.1-0.7 mm
The diameter R of the inner peripheral edge is slightly smaller than the inner diameter l of the locking groove 5 (for example, the inner diameter 1 is 45 mm, and the cross-sectional diameter a is 4 mm). In this case, it is formed large (R> l) by about 0.1 to 0.7 mm.

Then, such an elliptical seal ring 6 is inserted into the locking groove 5 while elastically expanding the minor axis r.

In the case of the invention of the assembling method described in claim 2,
The minor diameter d of the outer peripheral edge (Fig. 1) is slightly smaller than the outer diameter L of the locking groove 5 (about 0.1 to 0.7 mm when the outer diameter L is 54 mm and the cross-sectional diameter a is 4 mm). , The major axis D of the outer peripheral edge
(Figs. 1 and 3) are slightly larger than the outer diameter L of the engaging groove 5, and the seal rings 6 formed respectively are used.

Then, the seal ring 6 is inserted into the locking groove 5 while elastically shrinking the major axis D of the outer peripheral edge.

Further, each of the seal rings of the present invention is an annular ring having a cross-sectional outer diameter a smaller than the width dimension b of the locking groove 5, which is assembled to the circular locking groove 5 formed on the flange surface. The entire shape of the seal ring 6 before assembly is an elliptical shape having a minor axis and a major axis slightly different from each other.

In the seal ring 6 described in claim 3, the minor diameter r of the inner peripheral edge is slightly smaller than the inner diameter l of the locking groove 5, and the major diameter R of the inner peripheral edge is the inner diameter l of the locking groove 5. Slightly larger than each and formed respectively.

Further, in the seal ring 6 described in claim 4, the minor diameter d of the outer peripheral edge is slightly smaller than the outer diameter L of the locking groove 5,
The major axis D of the outer peripheral edge is slightly larger than the outer diameter L of the locking groove 5 and is formed.

(Operation) When the seal ring of the present invention configured as described above is assembled in the engagement groove 5 of the flange surface by the above-described assembly method of the present invention, the assembly work can be easily performed, Moreover, the seal ring 6 does not accidentally fall out of the locking groove 5 after the assembly.

That is, when the seal ring 6 described in claim 3 is used and the seal ring 6 is assembled in the engagement groove 5 on the flange surface by the assembly method described in claim 1, the elliptical seal ring 6 is used. The seal ring 6 is inserted into the locking groove 5 while elastically expanding the minor axis r of the inner peripheral edge.

However, the seal ring 6 has a circular cross section, and the difference (l−r) between the minor diameter r and the inner diameter 1 of the locking groove 5 is sufficiently smaller than the diameter a of the cross section of the seal ring 6, so that By simply pushing the seal ring 6 into the locking groove 5, the short diameter r is elastically expanded.

As a result, as shown in FIG. 2, the short-diameter r portion of the inner peripheral edge of the seal ring 6 is elastically pressed against the inner peripheral side peripheral surface of the locking groove 5 and the inner portion of the short-diameter r portion Due to the frictional force acting between the peripheral surface and the peripheral surface, the seal rig 6 is prevented from accidentally falling out of the locking groove 5 after assembly.

When the seal ring 6 described in claim 4 is used and the seal ring 6 is assembled in the engagement groove 5 on the flange surface by the assembly method described in claim 2, the seal ring 6 has an elliptical shape. The seal ring 6 is inserted into the locking groove 5 while elastically shrinking the major diameter D portion of the outer peripheral edge of the.

Also in this case, simply by pushing the seal ring 6 into the locking groove 5, the major axis D portion is elastically expanded.

As a result, as shown in FIG. 3, the major axis D portion of the outer peripheral edge of the seal ring 6 is elastically pressed against the outer peripheral side peripheral surface of the locking groove 5, and the major axis D portion and the outer peripheral side peripheral surface. The frictional force acting between and prevents the seal ring 6 from being accidentally dropped from the inside of the engaging groove 5 after the assembling.

The seal ring 6 to which the present invention is applied is not limited to the one in which the gasket material 9 is wound around the thin metal plate 10 as shown in the drawing, but may have a circular cross section to obtain a desired shape and elasticity. Other structures may be used as long as they are present.

The overall shape may be elliptical at the same time as the manufacturing of the seal ring 6, or by deforming the true circular seal ring later, it may be elliptical.

(Effect of the Invention) The seal ring and its assembling method of the present invention are configured and operate as described above, but the seal ring is not prepared after the assembling while the assembling of the seal ring into the locking groove is facilitated. Since it can be prevented from falling off, the assembling property of the connecting portion such as the exhaust pipe is improved.

[Brief description of drawings]

FIG. 1 is a front view showing the overall shape of the seal ring of the present invention, and FIG. 2 is a part of FIG. 4 showing the state in which the seal ring is assembled in the locking groove by the method described in claim 1. FIG. 3 is an enlarged sectional view corresponding to FIG. 3, FIG. 3 shows a state in which the seal ring is assembled in the locking groove by the method described in claim 2, a view similar to FIG. 2, and FIG. 5 is a perspective view of a flange incorporated in the pipe connecting portion, and FIG. 6 is a partially enlarged cross-sectional view showing an example of the seal ring. 1: First pipe, 2: Second pipe, 3: First flange, 4: Second flange, 5: Locking groove, 6: Seal ring, 7, 8: Small circular hole,
9: Gasket material, 10: Metal thin plate.

Claims (4)

[Claims] 1. A method for assembling a ring-shaped seal ring, the outer diameter of which is smaller than the width of the engaging groove, into the perfect circular engaging groove formed on the flange surface, which is before assembling. The overall shape is an elliptical shape in which the short diameter and the long diameter are slightly different, the short diameter of the inner peripheral edge is slightly smaller than the inner diameter of the locking groove, and the long diameter of the inner peripheral edge is A method of assembling a seal ring, wherein a seal ring that is slightly larger than the inner diameter is inserted into the locking groove while elastically expanding the short diameter. 2. A short diameter of the inner peripheral edge is slightly smaller than the inner diameter of the locking groove, and a long diameter of the inner peripheral edge is slightly larger than the inner diameter of the locking groove, instead of the seal rings formed respectively. , The minor diameter of the outer peripheral edge is slightly smaller than the outer diameter of the locking groove, and the major diameter of the outer peripheral edge is slightly larger than the outer diameter of the locking groove. The method for assembling the seal ring according to claim 1, wherein the seal ring is inserted into the locking groove while elastically contracting the major axis of the outer peripheral edge. 3. A ring-shaped seal ring, which has a cross-sectional outer diameter smaller than a width dimension of the engaging groove, and which is assembled in a perfect circular engaging groove formed on the flange surface, and which is before assembling. The overall shape is an elliptical shape in which the short diameter and the long diameter are slightly different, the short diameter of the inner peripheral edge is slightly smaller than the inner diameter of the locking groove, and the long diameter of the inner peripheral edge is smaller than the inner diameter of the locking groove. A slightly larger seal ring that is characterized by being formed in each case. 4. A ring-shaped seal ring, which has a cross-sectional outer diameter smaller than a width dimension of the engaging groove, and which is assembled in a perfect circular engaging groove formed on a flange surface, and which is before assembling. The overall shape is an elliptical shape in which the short diameter and the long diameter are slightly different, the short diameter of the outer peripheral edge is slightly smaller than the outer diameter of the locking groove, and the long diameter of the outer peripheral edge is the outer diameter of the locking groove. A seal ring characterized by being formed slightly larger than the diameter.