CN1270059C - Tube-like exhaust pipe with internal-external layers - Google Patents

Abstract

The purpose of the invention is to prevent a chattering sound in an exhaust pipe of inner-outer double-tube type exhaust pipe caused by wear generated between a separate protrusion and its contact part due to long-time use. An inner-outer double-tube type structure is provided by constituting an exhaust pipe 1 of an outer pipe 10 and an inner pipe 11 coaxially arranged inside it, and at its rear end, a separate protrusion 15 is protruded inward from the outer pipe 10 and brought into contact with the inner pipe 11, and the inner pipe 11 is made capable of sliding. The separate protrusion 15 is provided in plural in the circumferential direction, and a suppressing member 18 is slightly pressed into a clearance 17 of an outward projection 16 formed between the adjacent separate protrusions 15 and plug welded to the outer pipe 10.

Description

Tube-like exhaust pipe with internal-external layers

Technical field

The present invention relates to the tube-like exhaust pipe with internal-external layers that a kind of automatic two-wheeled cycle etc. uses, even particularly relate to the long-time tube-like exhaust pipe with internal-external layers that vebrato also can not take place that uses.

Background technique

Make inside and outside two-layer tubular construction with being connected motor to the outlet pipe between the baffler, form the separation projection of protruding towards radial direction in its back-end on the outer tube of portion, make described separation projection and interior pipe butt and the interior pipe of support, thereby pipe keeps predetermined distance with outer tube in making, simultaneously, for pipe relatively moving in when thermal expansion produces elongation (hereinafter referred to as thermal stretching), allowing to outer tube, and sliding freely with interior pipe butt, this be well-known (with reference to Japanese kokai publication hei 11-303632 number).

Summary of the invention

But, even in said structure,, separate the abrasion gap that also can produce pettiness because of abrasion between projection and the interior pipe through using for a long time, interior pipe is because of described abrasion gap self-excited vibration generation vebrato.The objective of the invention is to effectively prevent the generation of this vebrato.

In order to solve above-mentioned problem, the tube-like exhaust pipe with internal-external layers that the present invention relates to, be provided with the interval of regulation at circumferencial direction and a plurality ofly between outer tube and interior pipe, protrude and the separation projection of butt from a direction the opposing party, make the interior pipe and the inboard of outer tube keep predetermined gap by the described projection of separating, simultaneously, can be slidably supported the other side's one side that connects at the aforementioned abutting part of separating projection, it is characterized in that, in the gap that between aforementioned inner and outer pipes, forms, be pressed into and be used for making aforementioned interior pipe and the protruding compacting part that connects airtight of aforementioned separation.

At this moment, also can form aforementioned separation projection towards interior pipe from outer tube, and, by welding aforementioned compacting part is fixed on the outer tube.

Compacting part is pressed in the gap between outer tube and the interior pipe, like this, by described compacting part interior pipe effectively is squeezed in and separates on the projection.After the long-time use of described state, even wear away between the other side of separation projection and butt, interior Guan Buhui generation self-excited vibration keeps connecting airtight owing to manage in the extruding of compacting part makes and separate projection, so consequently can prevent the generation of vebrato.

At this moment, as long as compacting part is welded on the position that just can determine compacting part on the outer tube really, thereby can be pressed into compacting part simply.And, because can residual weld mark on the slip surface, so need not implement special fine finishing to the slip surface of compacting part in order to ensure the slip of interior pipe.

Description of drawings

Fig. 1 is the profile that has adopted the automatic two-wheeled cycle of tube-like exhaust pipe with internal-external layers of the present invention.

Fig. 2 is the profile of tube-like exhaust pipe with internal-external layers.

Fig. 3 is the 3-3 line sectional view of Fig. 2.

Fig. 4 is the 4-4 line sectional view of Fig. 3.

Fig. 5 is the figure of expression compacting part weld part.

Fig. 6 is the welded enlarged cross section figure of presentation graphs 5.

Fig. 7 relates to second embodiment's figure.

Fig. 8 relates to the 3rd embodiment's figure.

Fig. 9 relates to the 4th embodiment's figure.

Embodiment

First embodiment is described below with reference to the accompanying drawings.Fig. 1 is the profile of automatic two-wheeled cycle that adopts the tube-like exhaust pipe with internal-external layers of present embodiment, Fig. 2 is the profile of vent systems device that comprises the tube-like exhaust pipe with internal-external layers of present embodiment, Fig. 3 is the 3-3 line sectional view of Fig. 2, Fig. 4 is the 4-4 line sectional view of Fig. 3, Fig. 5 is the figure of expression compacting part weld part, and Fig. 6 is the welded enlarged cross section figure of presentation graphs 5.

As shown in Figure 1, the end (hereinafter referred to as front end) of exhaust upstream one side of outlet pipe 1 is connected to the relief opening of motor 2, from extended part here from the place ahead of motor 2 around downwards, and to the vehicle body rear extension, the end (hereinafter referred to as rearward end) of exhaust downstream one side is connected to baffler 3, thereby the gas of motor 2 discharging is directed to baffler 3 and then from arranging space here to the vehicle body rear.

Symbol 4 among the figure is head pipes, the 5th, vehicle body frames, the 6th, pivot, the 7th, rear-swing arm, 8 is arranged on the back buffer parts between vehicle body frames and the rear-swing arm, the front end of described rear-swing arm 7 by pivot 6 swings be supported on freely on the vehicle body, and in its back-end portion support diagram abridged trailing wheel.

Among Fig. 2, outlet pipe 1 forms the inside and outside two-layer tubular construction of outer tube 10 and interior pipe 11.Flange 12 is arranged on the front end of outlet pipe 1, here outlet pipe 1 is installed on the relief opening of motor 2.The rear end of outlet pipe 1 is connected with connecting tube 13 setting-ins.

Connecting tube 13 stretches out to exhaust downstream one side from the inside of baffler 3, exhausting air is directed in the main part of baffler 3.The small diameter part 14 that forms in front end one side of baffler 3 is coated on the joint of outlet pipe 1 and connecting tube 13, together is welded on the outer surface of outer tube 10 with connecting tube 13.

As Fig. 3 and shown in Figure 4, outer tube 10 and interior pipe 11 form the pipe shape by the suitable metal of iron etc. respectively, in the inboard of 11 pairs of outer tubes 10 of pipe keep specified gap D, with outer tube 10 concentric arrangement roughly, in order to keep described concentric, form projectedly towards interior pipe 11 from outer tube 10 and will separate projection 15 rearward end at outlet pipe 1.

Separate projection 15 and be the rearward end of outer tube 10 protruded integratedly by impact briquetting, to the inboard of radial direction and form and butt is managed 11 periphery in being supported on, occasion at present embodiment, circumferencial direction at outer tube 10 forms equally spaced four, and the height of its protrusion roughly clearance D with outer tube 10 and interior pipe 11 is identical.In addition, in order to stretch when interior pipe 11 thermal stretchings, the abutting part of separating pipe 11 in 15 pairs of the projectioies can slide freely.

As can be seen from Figure 4, outer tube 10 and interior pipe 11 are integrated partly in separating projection 15 in rearward end, and in its place ahead, interior pipe 11 disposes and keep specified gap D towards the inner concentric of outer tube 10.

As can be seen from Figure 3, form the foreign side's protuberance 16 that protrudes from the foreign side of interior pipe 11 1 side direction radial directions between adjacent separation projection 15,15, side forms gap 17 within it.Foreign side's protuberance 16 is the statements during from interior pipe 11 unilateral observation outer tubes 10, is to form to separate protruding 15 o'clock in the rearward end of outer tube 10, as the residual part of non-forming part.Therefore, the peripheral part of foreign side's protuberance 16 is the original outer radius portion of outer tube 10, and gap 17 is specified gap D at the width of radial direction.

Compacting part 18 is pressed in one of described gap 17, by stick harness 19 and 16 plug weldings of foreign side's protuberance.Compacting part 18 is formed by the suitable metallic material of iron etc., and set the width of the radial direction that makes its wall thickness T and gap 17 for, it is big to be that the specified gap D of outer tube 10 and interior pipe 11 compares some degree ground, by tunk gently being pressed into of the degree that just can be pressed into hammer, is pressed into compacting part 18.

As Fig. 4 and shown in Figure 6, the end that at first is pressed into of compacting part 18 is formed the thin type that " R " shape or taper etc. are pressed into easily, and, as shown in Figure 5, has the length of comparing short some degree with the length of separating projection 15, in addition, as shown in Figure 3, bend to circular-arc that periphery with interior pipe 11 is slidingly connected.

Fig. 5 is that compacting part 18 is by the stick harness 19 and outer tube 10 plug weldings of the through hole 20 of formation on the foreign side's protuberance 16 that inserts outer tube 10 rearward end from the separation projection 15 of direction indication outer tube 10 shown in the arrow Y of Fig. 4 and the figure of compacting part 18.The A of Fig. 6 is the 6-6 line sectional view of the described welded Fig. 5 of modal representation.

And, compacting part 18 fixedly be not limited to plug welding, also can adopt other suitable welding methods.Compacting part 18 with the mutual fillet welding of end face of outer tube 10 among the B of Fig. 6.Even like this, if weld seam do not arrive in pipe 11 just no problem, thereby compacting part 18 can slide with interior pipe 11.

The following describes the effect of present embodiment.As shown in Figure 3, by compacting part 18 is pressed into gap 17, interior pipe 11 can be followed separation projection 15 extruding of some resiliently deformables to an opposite side.Under described state, interior pipe 11 is by thermal stretching during to outer tube 10 relative elongations, and to separating projection 15 and compacting part 18 slides, and cooling is still slided when shrinking.

Therefore, during long-time the use, in pipe 11 separation projection 15 and with the abutting part abrasion of compacting part 18, even produce such abrasion, by being pressed into the compacting part 18 of pipe 11 in gap 17 and the extruding in advance, interior pipe 11 is kept contact towards separation projection 15 extruding of the radially opposition side that is positioned at this compacting part 18.Therefore, do not produce abrasion between interior pipe 11 and the separation projection 15, the self-excited vibration of pipe 11 in not taking place, so, can prevent contingent vebrato after long-term use.

And, integrally formed by separating projection 15 with outer tube 10, can simply form and separate projection 15.In addition, only, just can prevent vebrato by a compacting part 18 being pressed into the simple structure of separating in projection 15 gaps that produce 17 because of forming.

And, by plug welding compacting part 18 is fixed on the outer tube 10, make that to be pressed into compacting part 18 gently just passable, thereby make assembly operation become easy.And, compacting part 18 positively can be located in outer tube 10 1 sides by plug welding, even do not carry out special following process, also outer tube 10 can be inlaid in the inboard of connecting tube 13, and, not can with the slip surface of interior pipe 11 on residual weld mark, so, need not be in order to ensure the slip of interior pipe 11, and the slip surface of compacting part 18 is implemented special fine finishing.

Fig. 7 is second embodiment and figure Fig. 3 same area of expression.In the present embodiment, will separate projection and 15 along the circumferential direction form equally spaced three, the result is, compacting part 18 is pressed in three gaps 17 of same formation.The structure of compacting part 18 and fixed structure identical with previous embodiment (omitting the diagram of weld part).And the part common with previous embodiment adopts common symbol.Following embodiment too.

Fig. 8 relates to the 3rd embodiment, and outer tube 10 and interior pipe 11 are identical with first embodiment (Fig. 3), among this embodiment, compacting part 18,18 is pressed in adjacent two gaps 17,17.So, can be more effectively with interior pipe 11 across the center, towards separation projection 15,15 extruding that are positioned at compacting part 18,18 opposite sides.

Fig. 9 is the 4th embodiment, among the described embodiment, across the position, opposite at the center of outer tube 10, form two with 180 ° of intervals and separate projection 15.But, described separate projection 15 crooked projectedly towards radial direction, more inwardly protrude the side than the internal diameter R11 of interior pipe 11, and, corresponding with it in the part of pipe 11, also form more inwardly square recessed curved part 21, separate projection 15 and curved part 21 and connect airtight than described internal diameter R11.

Foreign side's protuberance 16 and gap 17 with separate projection 15 stagger 90 ° of positions, still still at interval 180 ° be configured to a pair ofly relatively, compacting part 18,18 is pressed into each gap 17,17.R10 is the external diameter of outer tube 10, and is same with embodiment hereto forming outside the rearward end of separating projection 15, and the inboard of interior pipe 11 and outer tube 10 separates predetermined distance and disposes with one heart.

Like this, in separating projection 15 and curved part 21, outer tube 10 can connect airtight with interior pipe 11 well, simultaneously, even long-term the use by the compacting part 18,18 of relative configuration, makes the separation projection 15,15 of relative configuration and curved part 21,21 keep respectively connecting airtight, so, can similarly prevent vebrato with aforementioned each embodiment.

And, the invention is not restricted to the foregoing description, can in same inventive principle, carry out many variations and use.For example, the purposes of outlet pipe is not limited to automatic two-wheeled cycle, goes on motor-car or other motor.The use number of compacting part 18 is as long as just can there is no other greater than one limits, and can be pressed into the whole of gap 17 shown in above-mentioned each embodiment or it is a part of.In addition, its material is not limited to metal, just can use as long as have certain degree of hardness and durability and heat resistance.The degree that is pressed into comprises and is directly used in the variety of way that is pressed into or is pressed into gently and even is pressed into big pressure by power plant by the such hand-operated tools of hammer.And then, can pipe in 18 pairs of the compacting parts 11 is fixing, fixation method also is not limited to welding.

In addition, separate projection 15 and be not limited to form, pipe 11 1 sides in also can being arranged in outer tube 10 1 sides.Also can form respectively with outer tube 10 and interior pipe 11 in addition separating projection 15.In this occasion, preferably will separate projection and be fixed on the either side of outer tube 10 or interior pipe 11.

Claims (2)

1. tube-like exhaust pipe with internal-external layers, described outlet pipe forms inside and outside two-layer tubular construction, be provided with the interval of regulation at circumferencial direction and a plurality ofly between outer tube and interior pipe, protrude and the separation projection of butt from a direction the opposing party, make the interior pipe and the inboard of outer tube keep predetermined gap by the described projection of separating, simultaneously, can be slidably supported the other side's one side that connects at the aforementioned abutting part of separating projection

It is characterized in that, in the gap that between aforementioned inner and outer pipes, forms, be pressed into and be used for making aforementioned interior pipe and the protruding compacting part that connects airtight of aforementioned separation.

2. tube-like exhaust pipe with internal-external layers as claimed in claim 1 is characterized in that, forms aforementioned separation projection from outer tube towards interior pipe, and, by welding aforementioned compacting part is fixed on the outer tube.

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