JP2857354B2 - Bellows joint of exhaust pipe for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a bellows joint for an exhaust pipe for an internal combustion engine.

In a conventional bellows joint of an exhaust pipe for an internal combustion engine, a bellows pipe is interposed between one communication pipe and the other communication pipe of the exhaust pipe, and rings attached to both ends of the bellows pipe have outer surfaces of the bellows pipe. Is covered with a wire blade, and the displacement generated in the bellows pipe by the vibration of the internal combustion engine is suppressed by the wire blade.

In the bellows joint of the prior art described above, as the bellows pipe becomes shorter (the number of peaks of the bellows becomes smaller), the amount of displacement absorption of the bellows pipe becomes smaller, so that the stress or strain generated in the bellows pipe becomes larger, and the bellows pipe becomes smaller. There is an inconvenience that the bellows may be damaged early.Therefore, in order to improve the durability, it is necessary to increase the number of bellows of the bellows pipe. The wire blade was also made longer. Therefore, the conventional bellows joint has been expensive.

Further, the bellows joint for absorbing the thermal expansion of the crossover pipe of the V-type engine is required to be very compact due to the structure of the V-type engine, and this type of bellows joint has a large load in the bending direction. Therefore, a large displacement of the bellows in the bending direction must be suppressed, and the above-mentioned conventional bellows joint cannot be used for this kind of bellows joint.

An object of the present invention is to suppress large bending displacement of the bellows, shorten the length of the bellows, suppress displacement of the bellows in the compression direction and in the tension direction, and reduce the heat of the crossover pipe of the V-type engine. An object of the present invention is to provide a bellows joint of an exhaust pipe for an internal combustion engine that can be used to absorb expansion.

In the bellows joint for an exhaust pipe for an internal combustion engine according to the present invention, a heat-resistant elastic body is attached to one end of the bellows, one end of a ring is attached to the other end of the bellows, the bellows is covered with the ring, and the other end of the ring is heat-resistant. It is pressed against the elastic body.

Next, an embodiment of the present invention applied to a crossover pipe of a V-type engine will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a bellows joint of the present invention. The bellows joint 1 is one crossover pipe 3 and the other crossover pipe 4 of a V-type engine 2.
, And can be displaced in a bending direction, a compression direction, and a tension direction in order to absorb thermal expansion of the crossover pipes 3, 4 generated by vibration of the V-type engine 2.

The bellows joint 1 comprises a bellows 5 having one end attached to one crossover pipe 3 and the other end attached to the other crossover pipe 4, as shown in FIG. Elastic body 6
And a stopper ring 7 for supporting the heat-resistant elastic body 6, the heat-resistant elastic body 6 is formed of a metal mesh or the like,
The bellows 5 has a tubular body 8 interposed between the first bellows ridge at one end and the stopper ring 7 and has a flange 9 protruding from the tubular body 8 at the first bellows ridge side end. ing.

An inner ring 10 is attached to the other end of the bellows 5 to cover the bellows 5, and the inner ring 10 is provided with a fixed cylinder 11 attached to the other end of the bellows 5, and an upright portion 12 extending vertically from the fixed cylinder 11. And a covering tube 13 extending vertically from the upright portion 12 and extending parallel to the fixed tube 11 to cover the bellows 5.
, One end of an outer ring 14 is attached, and the inner ring 10 and the outer ring 14 cover the bellows 5.
The other end is pressed against the heat-resistant elastic body 6 attached to one end of the bellows 5, and the outer ring 14 is fitted and fixed on the outer wall of the coating tube 13 of the inner ring 10, and the coating tube 15 An upright portion 16 extends vertically from 15 and faces the upright portion 12 of the inner ring 10, and a pressure contact tube 17 extending perpendicular to the upright portion 16 and pressed against the cylindrical body 8 of the heat-resistant elastic body 6. Then, an orthogonal shoulder between the upright portion 16 and the press-contact tube 17 is engaged with an orthogonal step portion between the tubular member 8 of the heat-resistant elastic body 6 and the flange portion 9, and the press-contact tube 17 is connected to the tubular body of the heat-resistant elastic member 6. 8 is pressed against.

In the bellows joint according to the present invention, when a bending load is applied, bending displacement is suppressed by the outer ring 14 and the heat-resistant elastic body 6, and as shown in FIG.
4, the heat-resistant elastic body 6 is compressed against the press-connecting cylinder 17, the bending angle of the bellows 5 can be regulated, the bending displacement of the bellows 5 can be suppressed to the bending angle a, and the axial load can be reduced. Since the heat-resistant elastic body 6 is compressed in the axial direction and the end of the press-contact tube 17 of the outer ring 14 comes into contact with the stopper ring 7, the displacement of the bellows 6 in the compression direction can be suppressed. By compressing the flange 9 of the heat-resistant elastic body 6 between the end face of the portion and the upright portion 16 of the outer ring 14, displacement in the tensile direction can be suppressed.

FIG. 4 shows a modified example of the bellows joint of the present invention. The bellows joint of this modified example is provided with the flange 9 at only one end of the tubular body 8 and the heat-resistant elastic body 6 of the above-described embodiment. In place of the above, a heat-resistant elastic body 6 having a flange 18 at the other end facing the flange 9 at one end of the tubular body 8 is provided. Therefore, as shown in FIG. 4, the pressure contact cylinder 17 of the outer ring 14 is pressed into the concave portion of the tubular body 7 between the flange 9 and the flange 18 of the heat-resistant elastic body 6, 18 is supported by the stopper ring 7. In this modified example, the flange of the heat-resistant elastic body 6 disposed between the end of the press-contact tube 17 of the outer ring 14 and the stopper ring 7 without directly contacting the stopper ring 7 against the load in the press-contact direction. By compressing the portion 18, displacement in the compression direction can be suppressed.

Since the present invention has the above-described structure, the inner ring and the outer ring receive excessive displacement in the bending direction via the heat-resistant elastic body, and similarly receive excessive axial displacement via the heat-resistant elastic body. Since the stopper ring and the outer ring are received, the load received by the bellows is reduced, so that the durability of the bellows is improved. Similarly, the length of the bellows can be shortened, and since there is no need to use a wire blade, the cost is reduced. It can be compact.

[Brief description of the drawings]

FIG. 1 is a layout view of a bellows joint of an exhaust pipe for an internal combustion engine of the present invention.

FIG. 2 is a partial longitudinal side view of a bellows joint of an exhaust pipe for an internal combustion engine of the present invention.

FIG. 3 is a partially longitudinal side view showing a state in which a bellows joint of an exhaust pipe for an internal combustion engine of the present invention absorbs a bending load.

FIG. 4 is a partially longitudinal side view of a modified example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bellows joint 2 V type engine 3 Crossover pipe 4 Crossover pipe 5 Bellows 6 Heat resistant elastic body 7 Stopper ring 8 Tubular body 9 Flange part 10 Inner ring 11 Fixed cylinder 12 Upright part 13 Coated cylinder 14 Outer ring 15 Coated cylinder 16 Upright Part 17 Pressure contact tube 18 Flange

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-319826 (JP, A) JP-A 62-143018 (JP, U) JP-A 3-49317 (JP, U) JP-A 62-143 163392 (JP, U) 3-42018 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F01N 7/08

Claims (1)

(57) [Claims] At least one bellows is provided with a ring-shaped heat-resistant elastic body and a stopper ring for supporting the heat-resistant elastic body, and the other end of the bellows is fitted with one end of an inner ring to cover the bellows. An exhaust ring for an internal combustion engine, wherein one end of an outer ring is joined to the other end of the outer ring to cover the bellows with the inner ring and the outer ring, and the other end of the outer ring is provided with a press-contact tube for press-contacting the heat-resistant elastic body. Pipe bellows fittings.