KR100639581B1 - Muffler system for motorcycle - Google Patents

Abstract

The present invention improves the appearance of the resin muffler protector.

The first protector 15 made of polypropylene resin containing glass fibers having excellent heat resistance is attached to the surface of the muffler main body 30 of the muffler 13 with a rubber mount at intervals, and further on the first protector 15. The 2nd protector 16 which consists of polycarbonate resin which is transparent resin and was excellent in colorability is attached at intervals. The second protector 16 is coated with colored backside to form an opaque treatment layer, and the surface side is made to have a glossy surface with an appearance such as metallic feeling or clear coating.

Description

Muffler device for motorcycles {MUFFLER SYSTEM FOR MOTORCYCLE}

1 is a right side view of a scooter type motorcycle to which the present invention is applied;

2 is an enlarged side view of a muffler portion;

3 is a cross-sectional view taken along line 3-3 of FIG.

4 is a cross-sectional view taken along line 4-4 of FIG.

5 is a cross-sectional view taken along line 5-5 of FIG. 2;

6 is a view when the first protector is viewed from the side,

7 is a view of the second protector from the side,

8 is a cross-sectional view taken along line 8-8 of FIG.

9 is a cross-sectional view taken along line 9-9 of FIG.

10 is a view for explaining attachment of a clip nut,

11 is a view of the muffler in plan view,

12 is a view showing the muffler from the front.

<Explanation of symbols for main parts of drawing>

8… Swing power unit 12.. vent pipe

13... Muffler 14... Muffler Stay

15... First protector 16... 2nd protector

30... Muffler body portion 33.. Protector Stay

34... Screw 39.. Vent hole

42... Bolt 43.. Rubber mounts

47... Mounting recess 48... space

50... Clip nut 53.. Attachment sheet part

56... Lose weight hole 57... space

The present invention relates to a muffler device for a motorcycle, in which a muffler protector made of resin is provided on the muffler outer surface of the motorcycle.

It is well-known that a muffler protector was installed in the muffler outer surface of a motorcycle so that a high temperature muffler may not be exposed to the outside. As an example of such a thing, the metal muffler protector was bolted to the stay attached to the muffler main body (see Patent Document 1), and the muffler protector was made of resin and plated on the back side (the surface facing the muffler main body, hereinafter the same). The radiant heat is reduced by carrying out (see Patent Document 2).

(Patent Document 1) Japanese Unexamined Patent Application Publication No. 2-97185

(Patent Document 2) Japanese Patent Application Laid-Open No. 2001-73758

Recently, catalysts have been used in mufflers for exhaust gas purification. However, when the catalyst is used, the exhaust temperature is increased to increase the surface temperature of the muffler. Thus, even if a muffler protector is provided, the surface temperature may increase. In order to avoid such a temperature rise, it can be considered that the muffler protector is sufficiently separated from the muffler main body, but this makes it necessary to greatly widen the distance between the muffler protector and the muffler main body, and it is difficult to improve the appearance.

Moreover, in order to make a muffler protector made of resin, and in order to improve the heat insulation effect, when plating on the back surface, the special heat resistant resin of the grade which can be plated must be used, and cost increased. In addition, such heat-resistant resins (e.g., polypropylene resins containing glass fibers) have high resistance to chemicals such as paint thinners and are generally difficult to paint. Therefore, the resin itself is colored by mixing dyes or pigments. It is indispensable to use what was developed in this application by the compounding of the resin as simply coloring. However, such coloring cannot make transparent color, metallic tone, plating tone, etc., and it became difficult to improve the high-quality appearance. Then, this invention aims at the improvement of the external appearance in resin muffler protector.

In order to solve the said subject, the invention of Claim 1 which concerns on the muffler apparatus for motorcycles of this application is provided with the muffler apparatus for motorcycles provided with the muffler connected to the rear end of the exhaust pipe extended from an engine, and the muffler protector which covers the outer surface. In

The said muffler protector is made of resin, and the inner 1st protector and the outer 2nd protector were overlapped, and it was set as the double structure inside and outside.

The invention according to claim 2, wherein the first protector is elastically supported with respect to the muffler main body of the muffler, and the second protector is attached to the first protector.

The method of claim 3, wherein the first protector is characterized by using a material having a higher heat resistance than the second protector.

The said 1st protector is a polypropylene resin containing the colored glass fiber, The said 2nd protector is a transparent polycarbonate resin, The said 4th protector of Claim 1 characterized by the above-mentioned.

The invention according to claim 5, wherein the muffler protector is made of a transparent resin, comprising a muffler connected to the rear end of an exhaust pipe extending from the engine, and a muffler protector covering the outer surface thereof.

The said muffler protector is a polycarbonate resin of Claim 6 characterized by the above-mentioned.

The method according to any one of claims 4 to 6, wherein an opaque treatment layer is formed on an inner surface of the transparent muffler protector.

The method of claim 8, wherein the opaque treatment layer is characterized in that the coating, plating or separate colored member overlapping each other.

EMBODIMENT OF THE INVENTION Hereinafter, one Example is described based on drawing. 1 is a right side view of a scooter-type motorcycle including a muffler according to the present invention. In the vehicle body frame 1 formed by the pipe member or the like, the head pipe 2 is provided at the front end thereof, the middle part constitutes the lowest floor lower part 3, and the rear part 4 extends rearward at an oblique upper rear part. ).

A steering post 5 is rotatably supported by the head pipe 2, the lower part of the steering post 5 is connected to the front fork 6, and makes steering of the front wheel 7 supported at its lower end possible. The front part of the swing-type power unit 8 is supported by the rear frame 4 so that swinging is possible through a link. The rear cushion unit 10 is provided between the rear part of the swing-type power unit 8 and the rear frame 4. In addition, the rear wheel 11 is supported at the rear end of the swing-type power unit 8.

The exhaust pipe 12 extends backward from the exhaust port of the cylinder head 8a of the swing-type power unit 8 and is connected to the muffler 13. The muffler 13 is superimposed on the rear wheel 11 when viewed from the side, and is attached to the swing-type power unit 8 by the muffler stay 14. A muffler protector is attached to the muffler 13. The muffler protector has a double structure inside and outside which overlaps the first protector 15 and the second protector 16.

The air cleaner 17 is arrange | positioned above the power unit 8 which becomes the opposite side to the muffler 13 in the left side of a vehicle body, and supplies clean air to the cylinder head 8a via the carburettor 18. As shown in FIG. The fuel tank 20 is supported in the position which becomes the upper side of the rear wheel 11 at the rear end of the rear frame 4, and supplies fuel to the cylinder head 8a via the carburettor 18. As shown in FIG.

At the position of the front of the fuel tank 20 and the top of the swing-type power unit 8, a storage box 21 opening upward is disposed and supported by the rear frame 4, and can be opened and closed by the seat 22. It is supposed to be done. The storage box 21, the fuel tank 20, the rear frame 4, the carburettor 18, the air cleaner 17, and the respective parts of the swing-type power unit 8 are covered with the rear cover 23. .

2 is an enlarged right side view of the muffler 13 portion. The muffler 13 is made of metal and has a cylindrical muffler main body 30, a front cap 31 and an end cap 32 covering the front and rear openings thereof, and a length to an upper side of the muffler main body 30. The 1st protector 15 is affixed to the protector stay 33 arrange | positioned elongate in the direction. The rear end of the exhaust pipe 12 is connected to the front cap 31, and a catalyst (not shown) is housed inside the muffler main body 30. The tail pipe 32a extends rearward from the end cap 32, from which exhaust gas purified by the catalyst is discharged to the atmosphere.

The first protector 15 is a member covering most of the outer side of the muffler 13, and is formed of a heat resistant resin having excellent heat resistance, for example, a polypropylene resin containing glass fibers, and is previously colored in a suitable color. When viewed from the side, the range covered by the first protector 15 protrudes upward from the upper portion of the muffler 13 from a portion slightly lower than the middle part of the vertical direction of the muffler 13, and the front and rear directions are the muffler. It protrudes back and forth longer than the front-back end of (13), and is covered.

The 2nd protector 16 is a member which made much of an external appearance, and is comprised from resin which is inferior to the 1st protector 15, but has a good coloring agent, for example, polycarbonate resin. The second protector 16 is transparent, and the backside is coated with an appropriate color as an opaque treatment. Therefore, the surface forms the external appearance like metal gloss or clear coating, and the color of the back surface is reflected from the outer surface side.

The second protector 16 is superimposed on the first protector 15 and directly attached by fasteners such as screws 34 and the like. The second protector 16 is slightly smaller than the first protector 15 and has a different shape, the upper edge 37 of which is inclined forward obliquely downward, and the lower edge 38 of the first protector 15. It overlaps with the bottom edge 36 of the. The upper edge 35 and the lower edge 36 of the first protector 15 are substantially parallel. A substantially boomerang-shaped vent hole 39 is formed in the center portion of the second protector 16. The circumference | surroundings become the fan recessed part 40 inward (the 1st protector 15 side).

3 is a cross-sectional view taken along line 3-3 of FIG. The protector stay 33 has an approximately C-shaped cross section whose upper surface is the attachment surface 33a, and is attached to the surface of the muffler main body 30 by welding or the like with an attachment leg 33b provided at the open end. The welding nut 41 is attached to the attachment surface 33a of the protector stay 33, and the 1st protector 15 is dust-proof attached to the 1st protector 15 via the rubber mount 43 with the bolt 42 here. .

The rubber mount 43 has a boss-shaped recess 44 formed at a position corresponding to the attaching surface 33a of the first protector 15, and the attachment hole 44a formed at the bottom of the recess 44. ) And abuts on the attachment surface 33a. 45 is a washer interposed on the head of the bolt 42 and the upper surface of the rubber mount 43, and 46 is a collar.

The second protector 16 covers the attachment portion of the first protector 15 and the protector stay 33 by the bolt 42, the upper edge 37 is bent inward, and the attachment formed on the first protector 15. It fits inward of the edge part 47a of the recess 47. The lower edge 38 is also bent inward, and overlaps with the lower edge 36. The attachment recess 47 is formed along the upper edge 37 as viewed from above and from the side of the attachment hole 44a, and the second protector 16 as a whole is superimposed thereon.

The first protector 15 is spaced apart from the muffler main body portion 30 by a distance D, and the upper edge 35 is positioned just above the muffler main body portion 30, thereby providing a muffler main body portion 30. Cover approximately 1/4 of the outer circumference of the. A space 48 is formed between the first protector 15 and the second protector 16.

The space | interval D becomes a little larger than the dimension which added together the height of the attachment leg 33b, and the inner protrusion amount of the recessed part 44. FIG. This space | interval D becomes so that the thermal influence of the muffler main-body part 30 can be avoided.

4 is a cross-sectional view taken along the line 4-4 of FIG. 2, and the second protector 16 attaches the screw 34 to the attachment hole 49a formed at each bottom of the concave portion 49 formed at two positions before and after the longitudinal direction. It is fitted and fastened to the clip nut 50 provided in the corresponding position of the 1st protector 15. As shown in FIG. The clip nut 50 is a metal member which forms a substantially U-shaped cross section, and is fastened to the screw 34 by the nut part 52 of the shape cut out.

Reference numeral 51 denotes a through hole of the clip nut 50, 53 denotes an attachment sheet provided in the first protector 15 to attach the clip nut 50, 54 denotes a through hole, and 55 denotes a clip. It is a slit for attaching the nut 50 to the attachment sheet 53. The through holes 51 and 54 coincide with the copper 49a and the nut part 52. The coupling part of the 1st protector 15 and the 2nd protector 16 by the screw 34 is isolate | separated from the muffler main body part 30, and there is no direct heat transfer from the muffler main body part 30. As shown in FIG.

5 is a cross-sectional view taken along line 5-5 of FIG. 2, and the vent hole 39 overlaps the fat hole 56 formed in the first protector 15, and these fat hole holes 56 and recesses ( The heat is passed out from the surface of the muffler main body 30 to the outside through an arrow 40, and the cooling of the muffler main body 30 and the muffler main body 30 and the first protector 15 and the second protector ( 16) The air permeability of the space 57 inside is improved, and the temperature rise of this part is prevented.

FIG. 6 shows a shape when the first protector 15 is viewed from the side, and the attachment recess 47 is formed so that the contours of the second protector 16 and the same contour are the same, and roughly dry in the front-rear direction middle part. The model's fat loss hole 56 is formed. The recessed part 44 and the attachment sheet 53 are formed in front and back, respectively, with this fat loss hole 56 interposed between them. Engaging holes 58 and 59 are formed through the front end and the rear end in contact with the end 47a of the mounting recess 47.

7 shows the shape when the second protector 16 is viewed from the side, and the engaging projection 60 is formed integrally with the front end. Moreover, the engaging projection 61 is integrally formed also in the upper part of a rear part (refer FIG. 9).

FIG. 8 shows a cross section taken along the line 8-8 of FIG. 7, and the engagement protrusion 60 forms an approximately crank-shaped cross section extending forwardly by bending once inward and re-bending again substantially parallel again. By inserting into 58, it overlaps inside the front end part of the 2nd protector 16, and is engaged.

9 is a cross-sectional view taken along the line 9-9 of FIG. 7, wherein the engagement protrusion 61 is also bent inward, and is again bent substantially parallel to form a cross section which is bent into an approximately crank shape extending inwardly, and the engagement hole is formed. By inserting into 59, it overlaps inside the upper end of the rear part of the 1st protector 15, and is engaged.

FIG. 10 shows the attachment of the clip nut 50 at the 10-10 line cross section of FIG. The attachment sheet 53 forms a step 63 from the normal surface of the attachment recess 47 so as to be lowered one step inward, and the slit 55 penetrates the step 63. The upper end portion of the attachment sheet portion 53 facing the slit 55 in the vicinity of the step 63 forms a taper portion 64 to facilitate attachment of the clip nut 50.

As for the clip nut 50, the surface side 65 in which the through-hole 51 is formed is fitted in the slit 55 from the top, and overlaps on the attachment sheet 53, and the nut part 52 is formed simultaneously. The back surface side 66 is overlapped with the inner surface of the attachment sheet 53, respectively, and the attachment sheet part 53 is pinched | interposed and attached.

11 is a view of the muffler 13 in a plan view, and FIG. 12 is a view of the muffler 13 from the front. The muffler stay 14 is a side view (FIG. 2), and is a member obtained by integrating two hollow sheets 14a and 14b in a substantially triangular shape through two collars 67 and 67. The attachment parts 14c and 14c which are the parts which provided the collar 67 and 67 protrude in the up-down direction of the muffler 13, and are bolted to the swing-type power unit 8 (refer FIG. 1). The outer plate 14b constituting the muffler stay 14 is welded to the surface of the muffler 13, and a part thereof is overlapped and welded to the front cap 31. In addition, the inner plate 14a is welded to the surface of the muffler 13 (FIG. 12).

As shown in FIG. 11, the protector stay 33 is welded to the surface of the muffler 13 with the attachment leg 33b formed in the longitudinal middle part. Long hole-shaped groove holes 68 and 68 are formed in the attachment surface 33a, and through holes 69 and 69 are formed in both ends in the longitudinal direction, and the welding nut 41 (inside the portion) is formed. 3) is attached.

Next, the attaching procedure of a muffler protector is demonstrated. First, in order to attach the 1st protector 15 to the muffler 13, as shown in FIG. 3, the 1st protector 15 is overlapped on the protector stay 33, and the rubber mount 43 previously attached is shown. The hole of the collar 46 and the passage hole 69 are matched, the bolt 42 is passed through the collar 46 from the outside, and is fastened to the welding nut 41. As a result, the first protector 15 is dust-tightly attached to the protector stay 33 so as to maintain a large distance D.

Subsequently, as shown in FIG. 6 and FIG. 7, the second protector 16 is overlapped with the attachment recess 47 of the first protector 15, and the attachment hole 49a of the recess 49 is previously formed. 2 coinciding with the passage hole 54 of the attachment sheet 53 attached to the protector 16, as shown in Figs. 4 and 10, the screw 34 is attached from the outside with the attachment hole 49a and the clip nut ( It passes through the through-hole 51 and the through-hole 54 of 50, and fastens to the nut part 52. As shown in FIG.

As a result, the second protector 16 is attached to the surface side of the first protector 15. At this time, a space 48 is formed between the second protector 16 and the first protector 15. The space 48 has an interval d between the upper edge 37 and the amount of refraction of the lower edge 38 and the inner protrusion amount of the recess 49.

Next, the effect of the attached muffler protector will be described. First, the first protector 15 is a polypropylene resin containing glass fibers having excellent heat resistance, and further maintains the distance D with the muffler main body portion 30, thereby making the surface temperature of the first protector 15 sufficiently low. . However, since the 1st protector 15 is heat resistant resin, when compared with the metallic muffler protector, the space | interval D can be made smaller and external appearance can be improved.

In addition, since the double and inner structures of the first protector 15 and the second protector 16 are provided, the surface temperature can be further lowered. For this reason, when walking while pushing a vehicle body, even if a foot is located in the side of the muffler 13, it can be made into the surface temperature so that there is no discomfort.

Moreover, since the 2nd protector 16 was made into the polycarbonate resin with high transparency, the surface side is not coated, but it is glossiness and shows the external appearance with high quality like metallic feeling or clear coating. Therefore, although the 1st protector 15 is colored resin which has a limitation in external appearance, the 2nd protector 16 can obtain the high-quality external appearance without giving special surface treatment, and it is a resin muffler. The appearance of the protector can be greatly improved. Moreover, since expensive heat resistant resin does not have to be used, cost can be reduced compared with the improvement of external appearance.

Moreover, although the 2nd protector 16 is inferior in heat resistance than the 1st protector 15, it is a polycarbonate resin excellent in the coloring by coating, plating, etc., and uses this property and the coating of the appropriate color as an opaque process layer on the inner surface. Do this. Therefore, it can function as a cover member which covers and hides the 1st protector 15 in the overlap part. In addition, the opaque treated layer is visible from the outside through the transparent layer, so that it can be colored in a preferred color. Moreover, compared with the 1st protector 15, the degree of freedom of coloring becomes high, and external appearance can be improved further.

In addition, a double structure of the first protector 15 and the second protector 16 forms a space 48 between the first protector 15 and the second protector 16 and also provides a ventilation hole 39. Heat in the space 48 can be vented to the atmosphere from the air space, and the inside of the space 48 can be ventilated to prevent the heat from filling up in the space 48 to prevent the surface temperature of the second protector 16 from rising. can do.

In addition, since the space 48 communicates with the space 57 by the fat loss hole 56, the heat of the space 57 is transferred from the vent hole 39 to the atmosphere through the fat loss hole 56 and the space 48. Can be released. Therefore, the surface temperature rise of the 1st protector 15 and the 2nd protector 16 can also be prevented by this.

Moreover, since the 1st protector 15 is attached to the protector stay 33 by the rubber mount 43, it can support dust-proof and at the same time, the insulation attachment between the protector stay 33 and the 2nd protector 16 is prevented. This makes it possible to prevent the temperature rise of the first protector 15 and to attach it dustproofly.

In addition, since the second protector 16 can be coupled to the first protector 15 by a screw 34, the attachment becomes simple. In addition, since the engaging portion by the screw 34 is separated from the muffler main body portion 30, there is no direct heat transfer from the muffler main body portion 30 to the second protector 16, and thus the surface of the second protector 16. Temperature rise can be prevented.

In addition, this invention is not limited to the said embodiment, A various deformation | transformation and application are possible. For example, the muffler protector may be an outer layer structure, not a double structure. In this case, since the muffler protector is made of a transparent resin such as polycarbonate resin, the surface can be made of a glossy surface, so that an appearance such as metallic feeling or clear coating can be exhibited, so that an elegant appearance can be obtained. The external appearance of the resin muffler protector can be improved.

Moreover, when said opaque treatment layer is formed in the back surface of the muffler protector made of transparent resin which comprises this outer layer structure, the effect in the improvement of the appearance similar to the above is acquired. In addition to the coating, as the opaque treatment layer, a plating treatment or a separate colored material may be laminated by bonding or the like. In this way, various opaque treatment layers can be formed using the property of resin which is easy to color, such as a polycarbonate resin, and the freedom degree in opaque treatment layer formation becomes high.

In addition, when chromium plating, metallic coating, or the like is performed as the opaque treatment layer, the opaque treatment layer satisfactorily reflects heat, whereby the surface temperature of the muffler protector can be prevented.

However, the opaque treatment layer does not necessarily have to be formed. If the opaque treatment layer is not formed, the muffler protector becomes transparent and the skeleton effect can be obtained by making the lower muffler and the like visible. In addition, the formation of the opaque treatment layer described above can be applied to either the muffler protector having an outer layer structure or the second protector of the muffler protector having a double structure.

As the resin for the muffler protector, not only a polypropylene resin containing glass fibers but also another resin having the same effect in heat resistance or the like can be used as the heat resistant resin. Similarly, transparent resin is not limited to polycarbonate resin, The other resin which is excellent in transparency can be used.

According to claim 1, since the muffler protector has a double structure, the thermal insulation effect is improved. In addition, weight reduction can be achieved by resinization. In addition, since the second protector does not require very high heat resistance, it is easy to make a color with high quality, and the appearance of the resin muffler protector can be improved.

According to claim 2, the dustproofness of the muffler protector can be improved, and the attachment of the second protector can be simplified.

According to claim 3, since the first protector is a polypropylene resin containing colored glass fibers, the first protector is made heat resistant, and the appearance of the first protector can be maintained well without widening the distance from the muffler body. have.

According to claim 4, since the second protector is made of a transparent polycarbonate resin, the surface of the second protector becomes a glossy surface, and constitutes an external appearance such as metallic feeling or clear coating surface. Therefore, even if the 1st protector is colored which is hard to produce a sense of quality, since a 2nd protector can produce a sense of quality, the external appearance of the muffler protector using colored resin can be made favorable.

According to claim 5, since the muffler protector is made transparent, the surface can be made a gloss surface, and the external appearance like a metallic feeling or a clear coating surface can be comprised, and the external appearance of the resin muffler protector can be improved.

According to claim 6, since the muffler protector is made of polycarbonate resin having high transparency, an external surface having excellent glossiness can be easily formed.

According to claim 7, since the opaque treatment layer is formed on the inner surface of the muffler protector, it can function as a cover covering so that the inside cannot be seen and at the same time, the surface can be kept glossy.

According to claim 8, the degree of freedom in forming the opaque treatment layer is increased.

Claims (8)

In the muffler apparatus for motorcycles provided with the muffler connected to the rear end of the exhaust pipe extended from an engine, and the muffler protector which covers the outer surface, A muffler protector for motorcycles, wherein the muffler protector is made of resin, and the inner first protector and the outer second protector are overlapped to form a double structure. The method of claim 1, A muffler device for a motorcycle, characterized in that the first protector is elastically supported with respect to the muffler main body of the muffler and the second protector is attached to the first protector. The method of claim 1, The muffler device for a motorcycle according to claim 1, wherein the first protector is made of a material having higher heat resistance than the second protector. The method of claim 1, The first protector is made of polypropylene resin containing colored glass fibers, and the second protector is made of transparent polycarbonate resin. A muffler device for a motorcycle, comprising a muffler connected to a rear end of an exhaust pipe extending from an engine, and a muffler protector covering the outer surface thereof, wherein the muffler protector is made of transparent resin. The method of claim 5, The muffler protector is a muffler device for a motorcycle, characterized in that the polycarbonate resin. The method according to any one of claims 4 to 6, An opaque treatment layer is formed on an inner surface of the transparent muffler protector. The method of claim 7, wherein The opaque treatment layer is a muffler device for a motorcycle, characterized in that the overlapping coating, plating or separate coloring member.

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