JP4400823B2 - Muffler device for motorcycles - Google Patents

Description

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

  It is known that a muffler protector is provided on the outer surface of the muffler of the motorcycle so that the high-temperature muffler is not exposed to the outside. As an example of this, for the stay attached to the muffler body, a metal muffler protector is bolted (see Patent Document 1), the muffler protector is made of resin, and the back surface (the surface facing the muffler body, The same applies to the following), so that the radiant heat is lowered by plating (see Patent Document 2).

Japanese Utility Model Publication No. 2-97185 JP 2001-73758 A

  In recent years, catalysts have been used in mufflers for exhaust gas purification. However, when a catalyst is used, the exhaust temperature increases and the surface temperature of the muffler increases, so that even when a muffler protector is provided, the surface temperature may increase. In order to avoid such temperature rise, it is conceivable that the muffler protector is sufficiently separated from the muffler main body. However, if this is done, the space between the muffler protector and the muffler main body must be widened to improve the appearance. It became difficult to let you.

  In addition, since the muffler protector is made of resin and the heat insulation effect is enhanced, when the back surface is plated, a special heat-resistant resin of a grade that can be plated has to be used, which increases the cost. In addition, such heat-resistant resins (for example, polypropylene resin containing glass fiber) are generally difficult to paint because of their high resistance to chemicals such as paint thinner, so the resin itself can be mixed with dyes and pigments. Must be colored (in this application, the color developed by blending the resin in this way is simply referred to as coloring). However, with such coloring, a transparent color, metallic tone, or plating tone cannot be obtained, and it has become difficult to improve the appearance with a high-class feeling. Therefore, the main object of the present invention is to improve the appearance of the resin muffler protector.

In order to solve the above problems, the invention of claim 1 relating to a motorcycle muffler device of the present application comprises a muffler connected to the rear end of an exhaust pipe extending from the engine, and a muffler protector covering the outer surface thereof. In the muffler device for motorcycles
The muffler protector is made of resin , and the inner first outer protector and the outer second protector are overlapped to form an inner / outer double structure ,
Elastically supporting the first protector with respect to the muffler body of the muffler, and attaching the second protector to the first protector;
Place the muffler protector on the side of the muffler in side view,
Forming the first protector larger than the second protector;
The fastening portion of the first protector and the muffler, and the fastening portion of the second protector and the first protector are formed at different positions, respectively.
Characterized in that the fastening portion of the first protector and the muffler is formed in a position covered by the second protector in the vehicle side view.

According to a second aspect of the present invention, in the first aspect, the end portion of the second protector is formed so as to abut on the first protector,
An engagement protrusion is formed in at least a part of the second protector, and an engagement hole into which the engagement protrusion is inserted is formed in the first protector .

  A third aspect is characterized in that, in the first aspect, the first protector is made of a material having higher heat resistance than the second protector.

  A fourth aspect of the present invention is characterized in that, in the first aspect, the first protector is made of colored glass fiber-containing polypropylene resin, and the second protector is made of a transparent polycarbonate resin.

According to a fifth aspect of the present invention, in the first aspect, the muffler protector is made of a transparent resin.

  A seventh aspect is characterized in that an opaque treatment layer is formed on the inner surface of the transparent muffler protector in any one of the fourth to sixth aspects.

  An eighth aspect of the present invention is characterized in that, in the seventh aspect, the opaque treatment layer is formed by painting, plating, or superposing separate colored members.

According to claim 1, since the muffler protector has a double structure, the heat insulating effect is improved. Moreover, weight reduction can be achieved by resination. In addition, since the second protector is not required to have very high heat resistance, it is easy to obtain a high-quality color, and the appearance of the resin muffler protector can be improved. Moreover, the vibration isolator of the muffler protector can be improved and the mounting of the second protector can be simplified.

According to the second aspect, the second protector can be overlapped and engaged with the first protector by inserting the engaging protrusion into the engaging hole.

  According to the third aspect, since the first protector is made of colored glass fiber-filled polypropylene resin, the first protector is made heat resistant, and the appearance is kept good without widening the space with the muffler body. be able to.

  According to the fourth aspect, since the second protector is made of a transparent polycarbonate resin, the surface of the second protector is a glossy surface and forms an appearance such as a metallic feeling or a clear painted surface. Therefore, even if the first protector is colored so as not to give a high-class feeling, the second protector can give a high-class feeling, so that the appearance of the muffler protector using the colored resin can be improved.

  According to the fifth aspect, since the muffler protector is made transparent, the surface can be made a glossy surface, and an appearance such as a metallic feeling or a clear painted surface can be formed. Therefore, the appearance of the resin muffler protector Can be improved.

  According to the sixth aspect, since the muffler protector is made of a highly transparent polycarbonate resin, it is possible to easily form an appearance surface having a glossy appearance and excellent appearance.

  According to the seventh aspect, since the opaque treatment layer is formed on the inner surface of the muffler protector, it can function as a cover that covers the inner side so that it cannot be seen through, and the glossy appearance can be maintained on the surface.

  According to the eighth aspect, the degree of freedom in forming the opaque treatment layer is increased.

  An embodiment will be described below with reference to the drawings. FIG. 1 is a right side view of a scooter type motorcycle to which a muffler according to the present invention is applied. The body frame 1 formed by a pipe member or the like is provided with a head pipe 2 at the front end portion thereof, the middle portion forms the lowest floor lower portion 3, and the rear portion thereof forms a rear frame 4 that rises obliquely and extends rearward.

  A steering post 5 is rotatably supported on the head pipe 2, and a lower portion of the steering post 5 is connected to a front fork 6 so that a front wheel 7 supported on a lower end thereof can be steered. A front portion of a swing type power unit 8 is supported on the rear frame 4 through a link 9 so as to be swingable. A rear cushion unit 10 is provided between the rear portion of the swing type power unit 8 and the rear frame 4. A rear wheel 11 is supported at the rear end of the swing type power unit 8.

  An exhaust pipe 12 extends rearward from the exhaust port of the cylinder head 8 a of the swing type power unit 8 and is connected to the muffler 13. The muffler 13 overlaps the rear wheel 11 in a side view and is attached to the swing type power unit 8 by a muffler stay 14. A muffler protector is attached to the muffler 13. The muffler protector has an internal / external double structure in which a first protector 15 and a second protector 16 are stacked inside and outside.

  An air cleaner 17 is disposed above the power unit 8 on the left side of the vehicle body and opposite to the muffler 13, and supplies clean air to the cylinder head 8 a via the carburetor 18. A fuel tank 20 is supported at a position above the rear wheel 11 at the rear end portion of the rear frame 4 and supplies fuel to the cylinder head 8 a via the carburetor 18.

  A storage box 21 that opens upward is disposed in front of the fuel tank 20 and above the swing type power unit 8, supported by the rear frame 4, and can be opened and closed by a seat 22. The storage box 21, the fuel tank 20, the rear frame 4, the carburetor 18, the air cleaner 17, and each part of the swing type power unit 8 are covered with a rear cover 23.

  FIG. 2 is an enlarged right side view of the muffler 13 portion. The muffler 13 is made of metal, and includes a cylindrical muffler main body 30, a front cap 31 and an end cap 32 that cover the front and rear openings thereof, and a protector stay that is disposed long in the longitudinal direction on the upper side surface of the muffler main body 30. A first protector 15 is attached to 33. The rear end of the exhaust pipe 12 is connected to the front cap 31, and a catalyst (not shown) is accommodated in the muffler main body 30. A tail pipe 32a extends rearward from the end cap 32, from which exhaust gas purified by the catalyst is discharged into the atmosphere.

  The first protector 15 is a member that covers most of the outer side of the muffler 13, is formed of a heat-resistant resin excellent in heat resistance, for example, a polypropylene resin containing glass fiber, and is colored in an appropriate color in advance. The range covered by the first protector 15 is, as viewed from the side, covered in a vertical direction protruding slightly above the middle part of the muffler 13 from the lower part of the muffler 13 and above the upper end of the muffler 13. It is also long and protrudes back and forth.

  The second protector 16 is a member that places importance on the appearance, and is made of a resin that is inferior in heat resistance to the first protector 15 but that is good in color, such as a polycarbonate resin. The second protector 16 is transparent, and an appropriate color coating is applied to the back surface as an opaque treatment. Accordingly, the surface has an appearance as if it has been given a metallic luster or clear coating, and the color of the back surface can be seen through from the outer surface side.

  The second protector 16 is superimposed on the first protector 15 and directly attached by a fastener such as a screw 34. The second protector 16 is slightly smaller than the first protector 15 and has a different shape. The upper edge 37 is inclined obliquely downward and the lower edge 38 appears to overlap the lower edge 36 of the first protector 15. The upper edge 35 and the lower edge 36 of the first protector 15 are substantially parallel. A substantially boomerang-shaped air vent hole 39 is provided at the center of the second protector 16. The periphery is a recess 40 that is recessed inward (to the first protector 15 side).

  FIG. 3 shows a cross section taken along line 3-3 of FIG. The protector stay 33 has a substantially U-shaped cross section as an attachment surface 33a which is the upper surface, and is attached to the surface of the muffler main body 30 by welding or the like with attachment legs 33b provided at the open end. A weld nut 41 is provided on the mounting surface 33 a of the protector stay 33, and the first protector 15 is attached to the first protector 15 via a rubber mount 43 with a bolt 42.

  The rubber mount 43 is provided with a boss-shaped recess 44 at a position corresponding to the mounting surface 33 a of the first protector 15. The rubber mount 43 is fitted into a mounting hole 44 a provided at the bottom of the recess 44 and is brought into contact with the mounting surface 33 a. The 45 is a washer interposed between 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 bends inward, and fits inside the step 47 a of the attachment recess 47 formed in the first protector 15. Match. The lower edge 38 is also bent inward, but overlaps the lower edge 36. The mounting recess 47 is formed along the upper edge 37 above the mounting hole 44a and in a side view, and the second protector 16 as a whole overlaps therewith.

  The first protector 15 is separated from the muffler main body 30 by a distance D and covers the outside, and the upper edge 35 is positioned substantially immediately above the muffler main body 30 and covers the outer periphery of the muffler main body 30. A space 48 is formed between the first protector 15 and the second protector 16.

  The distance D is slightly larger than the sum of the height of the mounting leg 33b and the amount of protrusion inside the recess 44. The distance D is such that the thermal effect of the muffler main body 30 can be avoided.

  4 shows a cross section taken along line 4-4 of FIG. 2, and the second protector 16 inserts the screw 34 into the mounting holes 49a formed at the bottoms of the recesses 49 provided at two positions in the longitudinal direction. It is fastened to the clip nut 50 provided at the corresponding position. The clip nut 50 is a metal member having a substantially U-shaped cross section, and is fastened to the screw 34 by a cut-and-raised nut portion 52.

  51 is a through hole for the clip nut 50, 53 is a mounting seat provided in the first protector 15 for mounting the clip nut 50, 54 is a through hole, and 55 is a slit for mounting the clip nut 50 to the mounting seat 53. It is. The through holes 51 and 54 coincide with the 49a and the nut portion 52. The connecting portion of the first protector 15 and the second protector 16 by the screw 34 is separated from the muffler main body 30 and does not transfer heat directly from the muffler main body 30.

  FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 2, and the air vent hole 39 overlaps with the hollow hole 56 formed in the first protector 15, and heat is applied from the surface of the muffler main body 30 through the hollow hole 56 and the recess 40. As shown by the arrow, the muffler body 30 is cooled and the ventilation of the space 57 inside the muffler body 30 and the first protector 15 and the second protector 16 is improved. It comes to prevent.

  FIG. 6 shows the shape of the first protector 15 as viewed from the side, and the mounting recess 47 is formed so that each contour has the same shape as the second protector 16, and a substantially diamond-shaped hollow hole 56 is formed in the middle part in the front-rear direction. ing. A concave portion 44 and a mounting seat portion 53 are formed on the front and rear sides of the lightening hole 56, respectively. Engagement holes 58 and 59 are formed through the front end and the rear end of the mounting recess 47 in contact with the stepped portion 47a.

  FIG. 7 shows a side view of the second protector 16, and an engaging protrusion 60 is integrally formed at the front end. In addition, an engagement protrusion 61 is integrally formed on the rear upper end (see FIG. 9).

  8 shows a cross section taken along the line 8-8 in FIG. 7. The engagement protrusion 60 is bent inward once, and then bent again in substantially parallel to form a substantially crank-like cross section extending forward, to the engagement hole 58. By being inserted, the second protector 16 overlaps and engages with the inside of the front end portion.

  9 shows a cross section taken along the line 9-9 in FIG. 7. The engaging projection 61 also bends inward, is bent again substantially in parallel, and is bent in a substantially crank shape extending inward. Is inserted into the upper end of the rear portion of the first protector 15 so as to be engaged with each other.

  FIG. 10 shows the attachment of the clip nut 50 at the cross section along line 10-10 in FIG. The mounting seat portion 53 is formed so as to be lowered inward by a step 63 from the general surface of the mounting recess 47, and the slit 55 is formed through the step 63. The upper end portion of the mounting seat portion 53 facing the slit 55 in the vicinity of the step 63 forms a tapered portion 64 so that the clip nut 50 can be easily attached.

  In the clip nut 50, the front side 65 where the through hole 51 is formed is inserted into the slit 55 from above and overlapped on the mounting seat portion 53, and at the same time, the back side 66 where the nut portion 52 is formed is the mounting seat portion 53. Are attached to each other with the mounting seat 53 sandwiched from the front and back.

  11 is a plan view of the muffler 13, and FIG. 12 is a view showing the muffler 13 from the front. The muffler stay 14 is a member obtained by integrating two plate members 14a and 14b having a substantially triangular shape through two collars 67 and 67 in a side view (FIG. 2). The mounting portions 14c and 14c, which are provided portions, protrude in the vertical direction of the muffler 13 and are bolted to the swing type power unit 8 (see FIG. 1). The outer plate member 14 b 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. Further, the inner plate member 14 a 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 by a mounting leg 33 b formed in the middle portion in the length direction. The mounting surface 33a is provided with elongated holes 68, 68, through holes 69, 69 are provided at both ends in the length direction, and the weld nut 41 (FIG. 3) is attached to the inside of this portion. ing.

  Next, a procedure for attaching the muffler protector will be described. First, to attach the first protector 15 to the muffler 13, as shown in FIG. 3, the first protector 15 is stacked on the protector stay 33, and the hole 46 and the through hole of the collar 46 of the rubber mount 43 attached in advance. 69 is matched, and the bolt 42 is passed from the outside to the collar 46 and fastened to the weld nut 41. As a result, the first protector 15 is attached to the protector stay 33 in a vibration-proof manner so as to maintain a large distance D.

  Subsequently, as shown in FIGS. 6 and 7, the second protector 16 is overlaid on the mounting recess 47 of the first protector 15, and the mounting hole 49 a of the recess 49 is passed through the mounting seat 53 previously mounted on the second protector 16. 4 and 10, the screw 34 is passed from the outside through the mounting hole 49 a, the through hole 51 and the through hole 54 of the clip nut 50, and fastened to the nut portion 52.

  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. In the space 48, the upper edge 37 forms an interval d that is about the amount of refraction of the lower edge 38 and the amount of protrusion inside the recess 49.

  Next, the operation and effect of the muffler protector thus attached will be described. First, the first protector 15 is a glass fiber-containing polypropylene resin having excellent heat resistance, and the surface temperature of the first protector 15 is sufficiently lowered in order to maintain the distance D from the muffler main body 30. However, since the 1st protector 15 is a heat resistant resin, when compared with a metal muffler protector, the space | interval D can be made smaller and an external appearance property can be improved.

  Moreover, since the inner / outer double structure of the first protector 15 and the second protector 16 is adopted, the surface temperature can be further lowered. For this reason, when pushing the vehicle body, the surface temperature can be set to a level that does not cause a sense of incongruity even if the foot is located on the side of the muffler 13.

  Further, since the second protector 16 is made of a highly transparent polycarbonate resin, the surface side thereof is not painted, but is glossy and exhibits a high-grade appearance such as a metallic feeling or a clear painting. Therefore, despite the fact that the first protector 15 is a colored resin with a limited appearance, a high-quality appearance can be obtained without any special surface treatment by the second protector 16, and the resin muffler can be obtained. The appearance of the protector can be greatly improved. In addition, since it is not necessary to use an expensive heat-resistant resin, the cost can be reduced for improving the appearance.

  Further, the second protector 16 is inferior in heat resistance to the first protector 15, but is a polycarbonate resin excellent in coloring by painting, plating or the like, and by utilizing this property, an appropriate color coating is applied as an opaque treatment layer on the inner surface. Is given. Therefore, it can function as a cover member that covers the first protector 15 in the overlapping portion. Moreover, since the opaque treatment layer is visible from the outside through the transparent layer, it can be given a favorite color. In addition, the degree of freedom in coloring is higher than that of the first protector 15, and the appearance can be further improved.

  Further, the first protector 15 and the second protector 16 have a double structure, and a space 48 is formed between the first protector 15 and the second protector 16, and heat in the space 48 is released from the air vent hole 39 into the atmosphere. Therefore, since the space 48 can be ventilated, it is difficult for heat to be trapped in the space 48 and an increase in the surface temperature of the second protector 16 can be prevented.

  In addition, since the space 48 communicates with the space 57 through the hollow hole 56, the hot air in the space 57 can be discharged from the air vent hole 39 to the atmosphere through the hollow hole 56 and the space 48. Therefore, this can also prevent the surface temperature of the first protector 15 and the second protector 16 from rising.

  Moreover, since the 1st protector 15 is attached to the protector stay 33 by the rubber mount 43, while being able to support vibration isolation, the heat insulation attachment between the protector stay 33 and the 2nd protector 16 is attained, and the temperature rise of the 1st protector 15 is prevented. And anti-vibration mounting.

  In addition, since the second protector 16 can be coupled to the first protector 15 by the screw 34, the mounting becomes simple. In addition, since the joint portion by the screw 34 is separated from the muffler main body 30, there is no direct heat transfer from the muffler main body 30 to the second protector 16, and an increase in the surface temperature of the second protector 16 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 have a single structure instead of a double structure. In this case, by constructing the muffler protector with a transparent resin such as polycarbonate resin, the surface can be made a glossy surface, so that it can have an appearance like metallic or clear coating, so that a high-grade appearance can also be obtained. The appearance of the resin muffler protector can be improved.

  Further, if the above-described opaque treatment layer is formed on the back surface of the transparent resin-made muffler protector having a single structure, the same effect in improving the appearance can be obtained. In addition to coating, the opaque treatment layer may be laminated by plating or separate colored materials. If it does in this way, various opaque processing layers can be formed using the property of resin with easy coloring, such as polycarbonate resin, and the freedom degree in opaque processing layer formation becomes high.

  In addition, if the opaque treatment layer is subjected to chrome plating, metallic coating, or the like, these opaque treatment layers will reflect heat well, and this can also prevent an increase in the surface temperature of the muffler protector.

  However, the opaque treatment layer is not necessarily provided. If the opaque treatment layer is not provided, the muffler protector becomes transparent, and a skeleton effect can be produced by showing through the lower muffler and the like. In addition, about formation of the above-mentioned opaque process layer, it can apply to any of the 2nd protector in a single structure muffler protector and a double structure muffler protector.

Further, as the resin for the muffler protector, the heat resistant resin is not limited to polypropylene resin containing glass fiber, but other resins having the same effect in heat resistance can be used. Similarly, the transparent resin is not limited to the polycarbonate resin, and other resins having excellent transparency can be used.

Right side view of a scooter type motorcycle to which the present invention is applied Enlarged side view of the muffler Section 3-3 in FIG. 4-4 cross section of FIG. 2-5 cross section of FIG. Side view of the first protector Side view of the second protector Section 8-8 in FIG. Section 9-9 in FIG. Diagram explaining clip nut installation Plane view of muffler Figure showing the muffler from the front

Explanation of symbols

8: Swing type power unit, 12: Exhaust pipe, 13: Muffler, 14: Muffler stay, 15: First protector, 16: Second protector, 30: Muffler body, 33: Protector stay, 34: Screw, 39: Air vent Hole: 42: Bolt, 43: Rubber mount, 47: Mounting recess, 48: Space, 50: Clip nut, 53: Mounting seat, 56: Vent hole, 57: Space

Claims (9)

In a muffler device for a motorcycle including a muffler connected to a rear end of an exhaust pipe extending from an engine and a muffler protector covering an outer surface thereof,
The muffler protector is made of resin , and the inner first outer protector and the outer second protector are overlapped to form an inner / outer double structure ,
Elastically supporting the first protector with respect to the muffler body of the muffler, and attaching the second protector to the first protector;
Place the muffler protector on the side of the muffler in side view,
Forming the first protector larger than the second protector;
The fastening portion of the first protector and the muffler, and the fastening portion of the second protector and the first protector are formed at different positions, respectively.
A muffler device for a motorcycle, wherein a fastening portion between the first protector and the muffler is formed at a position covered with the second protector in a side view of the vehicle . The end of the second protector is formed so as to abut on the first protector,
2. The muffler device for a motorcycle according to claim 1, wherein an engagement protrusion is formed on at least a part of the second protector, and an engagement hole into which the engagement protrusion is inserted is formed in the first protector . 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 muffler device for a motorcycle according to claim 1, wherein the first protector is made of a colored glass fiber-containing polypropylene resin, and the second protector is made of a transparent polycarbonate resin. Before SL muffler protector transparent resin and to muffler device for a motorcycle according to claim 1, characterized in that the. The muffler device for a motorcycle according to claim 5, wherein the muffler protector is made of polycarbonate resin. The muffler device for a motorcycle 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 muffler device for a motorcycle according to claim 7, wherein the opaque treatment layer is formed by painting, plating, or overlapping separate colored members. The muffler device for a motorcycle according to any one of claims 1 to 4, wherein an air hole is provided in the second protector.

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