JPH0988575A - Bellows joint for exhaust pipe for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress excess displacement in the bending direction of a bellows, to suppress even excess displacement in a compression direction and a tensile direction of a bellows, and to shorten the length of a bellows. SOLUTION: A heat resisting elastic substance 6 is attached to one end of a bellows 5, the ends on one side of rings 10 and 14 are attached to the other end of the bellows 5 to cover the bellows 5 with the rings 10 and 14, and the ends on the other side of the rings 10 and 14 are brought into pressure contact with the heat resisting elastic substance 6.

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 for an exhaust pipe for an internal combustion engine, a bellows pipe is interposed between one communication pipe of the exhaust pipe and the other communication pipe, and rings attached to both ends of the bellows pipe are used to form an outer surface of the bellows pipe. Was covered with a wire blade, and the displacement caused in the bellows pipe by the vibration of the internal combustion engine was suppressed by the wire blade.

In the above-mentioned conventional bellows joint, as the bellows tube becomes shorter (the number of bellows becomes smaller), the amount of absorption of the displacement of the bellows tube becomes smaller, and the stress or strain generated in the bellows tube becomes large. There is an inconvenience of being damaged early, so it is necessary to increase the number of bellows peaks in the bellows tube in order to improve durability, and to increase the overall length of the bellows tube and increase the number of bellows peaks. It also lengthened the wire braid. Therefore, the conventional bellows joint is 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 is required to have a large load in the bending direction. Therefore, the large displacement in the bending direction of the bellows must be suppressed, and the bellows joint of this type cannot be used for the bellows joint of this type.

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

In the bellows joint of the 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 to cover the bellows with the ring, and the other end of the ring is heat-resistant. It is pressed against an elastic body.

Next, a detailed description will be given of attached drawings showing an embodiment in which the present invention is applied to a crossover pipe of a V-type engine.

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

As shown in FIG. 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, and the heat resistant elastic body 6 is attached to one end of the bellows 5. And a stopper ring 7 supporting the heat resistant elastic body 6, the heat resistant elastic body 6 is formed of a metal mesh or the like, and the stopper ring 7 and the first bellows mountain portion at one end of the bellows 5 are attached.
It has a tubular body 8 and a collar portion 9 projecting from the tubular body 8 at the end portion on the side of the first bellows mountain portion which is interposed between the tubular body 8 and the tubular body 8.

An inner ring 10 is attached to the other end of the bellows 5 to cover the bellows 5. The inner ring 10 is attached to the other end of the bellows 5, a fixed cylinder 11 and an upright portion 12 extending vertically from the fixed cylinder 11. And a covering cylinder 13 that extends vertically from the upright portion 12 and extends parallel to the fixed cylinder 11 to cover the bellows 5, and the covering cylinder 13 of the inner ring 10
One end of the outer ring 14 is attached to the outer ring 14 and the inner ring 10 and the outer ring 14 cover the bellows 5.
The other end of which 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 covering cylinder 13 of the inner ring 10, and the covering cylinder 15, 15 includes an upright portion 16 that extends vertically from 15 and faces the upright portion 12 of the inner ring 10, and a pressure contact tube 17 that extends vertically to the upright portion 16 and that presses against the tubular body 8 of the heat resistant elastic body 6. Then, the orthogonal shoulder between the upright portion 16 and the pressure contact cylinder 17 is engaged with the orthogonal step portion between the cylindrical body 8 of the heat resistant elastic body 6 and the flange portion 9 to move the pressure contact cylinder 17 into the cylindrical body of the heat resistant elastic body 6. It is pressed against No. 8.

The bellows joint according to the present invention suppresses the bending displacement by the outer ring 14 and the heat-resistant elastic body 6 when a bending load is applied. As shown in FIG.
The heat-resistant elastic body 6 is compressed against the pressure contact cylinder 17 of No. 4, the bending angle of the bellows 5 is regulated, and the bending displacement of the bellows 5 can be suppressed to the bending angle a. When the heat resistant elastic body 6 is compressed in the axial direction and the end portion of the pressure contact cylinder 17 of the outer ring 14 and the stopper ring 7 come into contact with each other, the displacement of the bellows 6 in the compression direction can be suppressed, and the first peak of the bellows 6 can be suppressed. By compressing the collar portion 9 of the heat resistant elastic body 6 between the end surface of the portion and the upright portion 16 of the outer ring 14, the displacement in the pulling direction can be suppressed.

FIG. 4 shows a modified example of the bellows joint of the present invention. The bellows joint of the modified example has a heat-resistant elastic body 6 of the above-mentioned embodiment in which a flange 9 is provided only at one end of a cylindrical body 8. Instead, the heat-resistant elastic body 6 is provided with a flange 18 at the other end facing the flange 9 at one end of the tubular body 8. 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 portion 9 and the flange portion 18 of the heat resistant elastic body 6, and the flange portion of the heat resistant elastic body 6 is pressed. 18 is supported by the stopper ring 7. In this modification, the end of the pressure contact cylinder 17 of the outer ring 14 and the stopper ring 7 do not directly abut against the load in the pressure contact direction, and the collar of the heat resistant elastic body 6 disposed between them is not directly contacted. By compressing the portion 18, the displacement in the compression direction can be suppressed.

Since the present invention has the above-mentioned structure, the inner ring and the outer ring receive the excessive displacement in the bending direction through the heat resistant elastic body, and similarly, the excessive displacement in the axial direction is received through the heat resistant elastic body. Since the stopper ring and the outer ring receive the load on the bellows, the durability of the bellows is improved, and the length of the bellows can be shortened as well. Can be made compact.

[Brief description of 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 partially 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 where the bellows joint of the 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]

 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 Collar part 10 Inner ring 11 Fixed cylinder 12 Upright part 13 Covered cylinder 14 Outer ring 15 Covered cylinder 16 Upright Part 17 Crimping cylinder 18 Collar

Claims (3)

[Claims] 1. A heat resistant elastic body is attached to one end of a bellows,
A bellows joint for an exhaust pipe for an internal combustion engine, wherein 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 pressed against a heat resistant elastic body. 2. A bellows has a heat-resistant elastic body attached to one end and a stopper ring for supporting the heat-resistant elastic body, one end of the ring attached to the other end of the bellows to cover the bellows with the ring, and the other end of the ring. A bellows joint for an exhaust pipe for an internal combustion engine, characterized in that the above is pressed against a heat resistant elastic body. 3. A bellows is fitted with a 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 and the other end of the inner ring. A bellows joint for an exhaust pipe for an internal combustion engine, wherein one end of an outer ring is joined to a bellows to cover a bellows with an inner ring and an outer ring, and the other end of the outer ring is pressed against a heat resistant elastic body.