WO2021059431A1

WO2021059431A1 - Exhaust device for saddle-type vehicle

Info

Publication number: WO2021059431A1
Application number: PCT/JP2019/037860
Authority: WO
Inventors: 徳一山崎
Original assignee: 本田技研工業株式会社
Priority date: 2019-09-26
Filing date: 2019-09-26
Publication date: 2021-04-01
Also published as: JP7245349B2; JPWO2021059431A1

Abstract

Provided is an exhaust device for a saddle-type vehicle, said exhaust device enabling high strength and improved appearance by optimizing the structure of a protector having a double-layer structure.　An exhaust device (30) for a saddle-type vehicle (1), said exhaust device having a muffler (32) exposed to the outside in a vehicle-width direction, and a protector (90) for protecting the muffler (32), wherein the protector (90) is configured from an inner protector (50) made of resin that covers at least a portion of the muffler (32) and an outer protector (70) made of metal that covers at least a portion of the inner protector (50). The outer protector (70) is supported by the muffler (32), and the inner protector (50) is supported by the back side of the outer protector (70). The outer protector (70) is rubber-mounted, using an annular grommet (75), to protector stays (60, 61) that extend outward in the vehicle-width direction from the muffler (32).

Description

Exhaust system for saddle-mounted vehicles

The present invention relates to an exhaust device for a saddle-type vehicle, and more particularly to an exhaust device for a saddle-type vehicle provided with a protector for protecting the muffler from flying stones and the like on the outside in the vehicle width direction of the muffler.

Conventionally, a structure has been known in which a protector that protects the muffler from flying stones and the like is provided on the outside in the vehicle width direction of the muffler that constitutes the exhaust system of a saddle-mounted vehicle.

Patent Document 1 discloses a configuration in which a protector having a double structure including a metal inner protector and a resin outer protector is attached to a muffler applied to a motorcycle.

Japanese Patent No. 4400823

The protector of Patent Document 1 has a metal protector on the inside and a resin protector on the outside, which makes it difficult for the feet and the like to come into contact with the metal protector from which the heat of the muffler is easily transferred. , The appearance is improved by the protector made of resin.

However, when the resin protector is arranged on the outside, there is a problem that the outer protector is liable to be scratched or cracked due to the influence of external force or flying stones.

An object of the present invention is to provide an exhaust device for a saddle-type vehicle capable of solving the above-mentioned problems of the prior art and optimizing the structure of a double-structured protector to improve high strength and appearance. is there.

In order to achieve the above object, the present invention provides an exhaust device for a saddle-mounted vehicle (1) having a muffler (32) exposed to the outside in the vehicle width direction and a protector (90) for protecting the muffler (32). In (30), the protector (90) covers at least a part of the muffler (32), a resin inner protector (50), and a metal outer protector (50) covering at least a part of the inner protector (50). The first feature is that it is composed of (70).

The second feature is that the outer protector (70) is supported by the muffler (32), and the inner protector (50) is supported on the back surface side of the outer protector (70). is there.

Further, an opening (55) is formed in the inner protector (50), a protector stay (60, 61) is fixed to the muffler (32), and the outer protector (70) is the opening. The third feature is that it is supported by the protector stays (60, 61) that are exposed outward from (55).

Further, the outer protector (70) is rubber-mounted by an annular grommet (75) with respect to the protector stays (60, 61) extending outward in the vehicle width direction from the muffler (32), and the outer protector. (70) is provided with an opening (70a) that engages with an annular groove (75a) formed on the outer peripheral surface of the grommet (75), and the outer protector (70) is provided with the opening (70a). A support plate (73) having a support opening (73a) having the same diameter is fixed, and the grommet (75) is annular in a state where the opening (70a) and the support opening (73a) are overlapped with each other. The fourth feature is that it engages with the groove (75a).

Further, two protector stays (60, 61) are provided so as to be separated from each other in the longitudinal direction of the muffler (32), and the outer protector (60, 61) is sandwiched between the two protector stays (60, 61). A fifth feature is that a fastening member (51) for attaching the inner protector (50) is arranged with respect to the 70).

Further, two fastening members (51) are provided between the two protector stays (60, 61), and each is arranged at a position closer to the protector stays (60, 61). Has a sixth feature.

The seventh feature is that the catalyst device (34) of the exhaust device (30) is provided in the middle of the exhaust pipes (33, 37) located on the upstream side of the muffler (32).

Further, the eighth feature is that the front end portion of the outer protector (70) extends to the front of the muffler (32) when viewed from the side of the vehicle body.

Further, the ninth feature is that the front end portion of the outer protector (70) extends to a position where it overlaps with the exhaust pipe (33) when viewed from the side of the vehicle body.

According to the first feature, in the exhaust device (30) of a saddle-type vehicle (1) having a muffler (32) exposed to the outside in the vehicle width direction and a protector (90) for protecting the muffler (32). The protector (90) includes a resin inner protector (50) that covers at least a part of the muffler (32) and a metal outer protector (70) that covers at least a part of the inner protector (50). By arranging the metal protector on the outside of the resin protector in the double-structured protector, the strength of the outer protector is increased and the muffler is effectively protected from the influence of external force and flying stones. At the same time, it is possible to prevent scratches and cracks. Further, since the metal protector is located on the outside, it is possible to obtain a high appearance that makes the best use of the texture of the metal.

According to the second feature, the outer protector (70) is supported by the muffler (32), and the inner protector (50) is supported by the back surface side of the outer protector (70). In a configuration where the inner and outer protectors are fastened together with the muffler, the inner protector may also be affected by the external force when the outer protector is affected by the external force, but the inner protector is not the muffler but the outer protector. By being supported by, the muffler side receives the external force applied to the outer protector, and it is possible to reduce the possibility that the resin inner protector is scratched or cracked.

According to the third feature, an opening (55) is formed in the inner protector (50), a protector stay (60, 61) is fixed to the muffler (32), and the outer protector (70) is fixed. ) Is supported by the protector stays (60, 61) exposed outward from the opening (55), so that the durability of the protector can be improved while improving the appearance.

According to the fourth feature, the outer protector (70) is rubber-mounted by an annular grommet (75) with respect to the protector stays (60, 61) extending outward in the vehicle width direction from the muffler (32). The outer protector (70) is provided with an opening (70a) that engages with an annular groove (75a) formed on the outer peripheral surface of the grommet (75), and the outer protector (70) is provided with an opening (70a). A support plate (73) having a support opening (73a) having the same diameter as the opening (70a) is fixed, and the opening (70a) and the support opening (73a) are overlapped with each other. Since it engages with the annular groove (75a) of the grommet (75), if the opening formed in the outer protector is directly engaged with the annular groove of the grommet, the grommet may be damaged by vibration due to its thin wall thickness. By increasing the wall thickness around the opening with the support plate, this can be prevented and stable mounting becomes possible. Further, by rubber-mounting the outer protector with respect to the muffler, it is possible to make it difficult for the heat of the muffler to be transferred to the outer protector.

According to the fifth feature, two protector stays (60, 61) are provided apart from each other in the longitudinal direction of the muffler (32), and between the two protector stays (60, 61). Since the fastening member (51) for attaching the inner protector (50) to the outer protector (70) is arranged, the inner protector and the outer side are between the protector stays firmly attached to the vehicle body side. It can be firmly fastened to the protector, and durability is enhanced.

According to the sixth feature, two fastening members (51) are provided between the two protector stays (60, 61), respectively, at positions closer to the protector stays (60, 61). Since it is arranged, the fastening member is arranged at a position close to the protector stay, so that the inner protector, the outer protector, and the protector stay can be firmly connected to each other.

According to the seventh feature, since the catalyst device (34) of the exhaust device (30) is provided in the middle of the exhaust pipes (33, 37) located on the upstream side of the muffler (32), the engine Since the catalyst device that becomes hot during the operation of the muffler is located on the outside of the muffler, the temperature of the muffler is less likely to rise, and the thermal effect on the inner protector can be reduced. As a result, the heat-resistant structure of the inner protector can be minimized, and the shape of the part can be simplified and the weight can be reduced.

According to the eighth feature, since the front end portion of the outer protector (70) extends to the front of the muffler (32) in the side view of the vehicle body, the metal outer protector is used to connect the muffler and the exhaust pipe. The joint can be hidden to enhance the appearance. In addition, the front end of the muffler, which is easily affected by external force due to curbs, steps, etc., can be protected by a metal outer protector.

According to the ninth feature, since the front end portion of the outer protector (70) extends to a position overlapping the exhaust pipe (33) in the side view of the vehicle body, the exhaust pipe connected to the front end portion of the muffler is also protected. It becomes possible to do.

It is a right side view of the motorcycle to which the exhaust device which concerns on one Embodiment of this invention is applied. It is a perspective view of an exhaust device. It is a rear view of the exhaust system. It is an enlarged side view of a muffler. It is a perspective view which looked at the muffler from the inside upper side in the vehicle width direction. It is a rear view which looked at the protector from the back side. It is a perspective view which looked at the protector from the rear upper side inside in the vehicle width direction. FIG. 7 is a perspective view of a state in which the protector stay is removed from FIG. 7. It is a perspective view which looked at the outer protector from the back side. It is an X-ray cross-sectional view of FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a right side view of a motorcycle 1 to which the exhaust device 30 according to the embodiment of the present invention is applied. The motorcycle 1 is a scooter-type saddle-mounted vehicle in which a low-floor floor 13 on which an occupant rests his / her feet is provided between the steering wheel 2 and the seat 15.

The body frame 12 of the motorcycle 1 includes a down frame 11 extending rearward and downward from the head pipe 4, a pair of left and right underframes 14 extending rearward from the lower end of the down frame 11, and rearward upward from the rear end of the underframe 14. Includes a rear frame 17 that stands up and extends to the rear end of the vehicle body. A steering handle 2 is fixed to the upper end of the steering stem 9 which is rotatably supported by the head pipe 4. A bottom bridge 6 that supports a pair of left and right front forks 8 that rotatably support the front wheel WF is fixed to the lower end of the steering stem 9.

The center of the steering handle 2 in the vehicle width direction is covered with the handle cover 3. The front and rear of the head pipe 4 are covered so as to be sandwiched between the front cowl 5 and the leg shield 10. A pair of left and right rear cowls 16 that support the seat 15 are arranged behind the low-floor floor 13 provided below the rear of the leg shield 10.

The unit swing type power unit P in which a continuously variable transmission is integrally configured behind the engine E is pivotally supported with respect to the rear frame 17 at a position above the engine E. The upper part of the rear end of the power unit P is suspended from the rear end of the rear frame 17 by the rear cushion 18. An exhaust device 30 for processing the combustion gas of the engine E is arranged on the right side in the vehicle width direction of the power unit P that rotatably supports the rear wheel WR as a drive wheel.

FIG. 2 is a perspective view of the exhaust device 30. In this figure, the state seen from diagonally rearward and upper right of the vehicle body is shown. Further, FIG. 3 is a rear view of the exhaust device 30. The exhaust device 30 is mainly connected to a flange 38 that supports an inlet 39 connected to the exhaust port of the engine E, an upstream pipe 37 as an exhaust pipe connected to the inlet 39, and a rear end of the upstream pipe 37. The catalyst device 34 is included, a downstream pipe 33 connected to the rear end of the catalyst device 34, and a muffler 32 as a silencer connected to the rear end of the downstream pipe 33. The main body of the muffler 32 is made of a metal such as iron, and an outlet pipe 31 is provided at the rear end thereof.

The cylindrical catalyst device 34 is oriented in the vehicle width direction, and a cover member 36 for preventing heat influence is attached to a position behind the flange 38. A first mounting stay 35 for fixing the exhaust device 30 to the power unit P is provided on the back surface of the catalyst device 34 on the right side in the vehicle width direction. Further, a second mounting stay 41 is provided inside the downstream pipe 33 in the vehicle width direction toward the rear, and a third mounting stay 40 is provided on the upper surface of the muffler 32 near the front. The metal third mounting stay 40 is welded and fixed to the muffler 32.

A protector 90 is attached to the outside of the muffler 32 in the vehicle width direction. The protector 90 has a double structure including an inner protector 50 (illustrated stippled hatching portion) arranged close to the muffler 32 and an outer protector 70 arranged close to the outer side of the inner protector 50 in the vehicle width direction.

The metal protector stays 60 and 61 that support the protector 90 are welded and fixed to the muffler 32, and a fastening member 71 such as a bolt is screwed onto the protector stays 60 and 61 from the outside in the vehicle width direction. ing.

As described above, since the catalyst device 34 of the exhaust device 30 is provided between the upstream pipe 37 and the downstream pipe 33 located on the upstream side of the muffler 32, the catalyst that becomes hot during the operation of the engine Since the device 34 is located on the outside of the muffler 32, the temperature of the muffler 32 is less likely to rise, and the thermal effect on the inner protector 50 can be reduced. As a result, the heat-resistant structure of the inner protector can be minimized, and the shape of the part can be simplified and the weight can be reduced.

FIG. 4 is an enlarged side view of the muffler 32. Further, FIG. 5 is a perspective view of the muffler 32 as viewed from above inside in the vehicle width direction. The exhaust device 30 according to the present embodiment is characterized in that the inner protector 50 is made of resin and the outer protector 70 is made of metal. As a result, the strength of the outer protector 70 can be increased to effectively protect the muffler 32 from the influence of external forces and flying stones, and to prevent scratches and cracks. Further, since the metal protector is located on the outside, it is possible to obtain a high appearance that makes the best use of the texture of the metal.

As described above, the double-structured protector 90 including the inner protector 50 and the outer protector 70 is supported by the muffler 32 by the front and rear protector stays 60 and 61. The inner protector 50, which has a larger surface area than the outer protector 70, has a shape that covers up to the rear upper part of the muffler 32, but since it is made of resin, it can be made lighter than a metal one. In addition, because it is made of resin, it is easy to handle complicated shapes and can contribute to the improvement of design.

On the other hand, the outer protector 70 having a small surface area extends forward so as to cover the joint between the muffler 32 and the downstream pipe 33. As a result, the metal outer protector 70 hides the joint between the muffler 32 and the downstream pipe 33 to enhance the appearance, and the front end of the muffler 32, which is easily affected by external force due to curbs, steps, etc., is made of metal. It is possible to protect it with a manufactured outer protector 70. Further, since the surface area of the metal outer protector 70 is small, the weight can be reduced and the productivity is improved because the shape is simple with few curved portions.

FIG. 6 is a rear view of the protector 90 as viewed from the back surface side. Further, FIG. 7 is a perspective view of the protector 90 as viewed from the rear upper side inside in the vehicle width direction. FIGS. 6 and 7 show a state in which the protector stays 60 and 61 welded to the muffler 32 are left on the protector 90 side.

The resin inner protector 50 is fixed to the back surface side of the metal outer protector 70 by fastening members 51 such as three bolts. The protector stays 60 and 61 formed by bending a thin metal plate do not come into contact with the inner protector 50, but pass through a connecting opening 55 as a substantially rectangular opening provided in the inner protector 50, and the outer protector 70. Only support.

In other words, the outer protector 70 is supported by the muffler 32, and the inner protector 50 is supported by the back surface side of the outer protector 70. As a result, in a configuration in which the inner protector and the outer protector are fastened together with the muffler, when the outer protector is affected by the external force, the inner protector may also be affected by the external force. By being supported by the outer protector 70 instead of, the external force applied to the outer protector 70 is received on the muffler 32 side, and it is possible to reduce the possibility of scratches or cracks on the resin inner protector 50. Become.

The fastening member (truss screw) 71 whose head is exposed to the outside of the outer protector 70 is arranged inside the protector stays 60 and 61 in the vehicle width direction through the through holes formed in the protector stays 60 and 61. It is screwed into the square nut 72. The square nut 72 may be welded to the protector stays 60 and 61. On the back surface side of the inner protector 50, a plurality of

vertical ribs

52 and 53 are formed to increase the strength while reducing the weight.

FIG. 8 is a perspective view of the state in which the protector stays 60 and 61 are removed from FIG. 7. Further, FIG. 9 is a perspective view of the outer protector 70 as viewed from the back surface side. The outer protector 70 is rubber-mounted on the protector stays 60 and 61 by an annular grommet 75. In order to realize this rubber mount satisfactorily, a support plate 73, which is a metal bowl-shaped member, is attached to the back surface side of the outer protector 70. The support plate 73 is welded to the outer protector 70 by three foot portions 74.

The support plate 73 is formed with a support opening 73a having the same diameter as the circular opening 70a provided on the outer protector 70, and the outer protector 70 has an annular groove formed on the outer peripheral surface of the annular grommet 75. The opening 70a and the support opening 73a of the support plate 73 are configured to overlap and engage with each other. A stay 76 for attaching the inner protector 50 is welded to the back surface side of the outer protector 70 by three fastening members 51. The stay 76 is provided with an engaging hole 76a with which the fastening member 51 is engaged.

FIG. 10 is a cross-sectional view taken along line XX of FIG. The protector stay 60 on the front side is welded to the muffler 32 by the welding bead 60a like the protector stay 61 on the rear side. The protector stay 60 is formed with a through hole 60b for passing the fastening member 71, and a square nut 72 is arranged so as to align the axis with the through hole 60b.

As described above, an annular groove 75a is formed on the outer peripheral surface of the rubber annular grommet 75. In the present embodiment, by providing the support plate 73 on the back surface side of the outer protector 70, the opening 70a portion of the outer protector 70 and the support opening 73a portion of the support plate 73 are overlapped with respect to the annular groove 75a. It is configured to be engaged in a state. If the opening 70a of the outer protector 70 is directly engaged with the annular groove 75a without providing the support plate 73, the annular grommet 75 may be damaged by vibration due to the thin wall thickness. By increasing the wall thickness around 70a, this can be prevented and stable mounting becomes possible.

A collar member 77 with a flange is sandwiched between the annular grommet 75 and the fastening member 71, and the pressing force of the annular grommet 75 against the protector stays 60 and 61 is controlled regardless of the tightening torque of the fastening member 71. Will be done. Further, since the outer protector 70 is rubber-mounted on the muffler 32, the impact applied from the outside can be absorbed and the heat of the muffler 32 is less likely to be transferred to the outer protector 70.

The form of the motorcycle, the structure of the exhaust device, the shape and material of the muffler and the protector stay, the shape and structure of the outer protector and the inner protector, the number and structure of grommets, etc. are not limited to the above embodiment, and various changes can be made. It is possible. For example, the outer protector can be made of various metals such as iron, aluminum and titanium. Further, in addition to the colored opaque resin, a colored transparent resin can be applied to the inner protector, or surface treatment such as plating can be applied to improve the appearance. The exhaust device according to the present invention can be applied to a saddle-mounted vehicle such as a saddle-mounted tricycle or a four-wheeled vehicle.

1 ... Motorcycle (saddle type vehicle), 30 ... Exhaust device, 32 ... Muffler, 33 ... Downstream pipe (exhaust pipe), 37 ... Upstream pipe (exhaust pipe), 50 ... Inner protector, 55 ... Communication opening ( Opening), 70 ... outer protector, 60, 61 ... protector stay, 70a ... opening, 73a ... support opening, 73 ... support plate, 75 ... annular grommet (grommet), 75a ... annular groove, 90 ... protector

Claims

In the exhaust device (30) of a saddle-mounted vehicle (1) having a muffler (32) exposed to the outside in the vehicle width direction and a protector (90) for protecting the muffler (32).
The protector (90) is composed of a resin inner protector (50) that covers at least a part of the muffler (32) and a metal outer protector (70) that covers at least a part of the inner protector (50). An exhaust system for saddle-mounted vehicles, which is characterized by being plastic.
The outer protector (70) is supported by the muffler (32).
The exhaust device for a saddle-type vehicle according to claim 1, wherein the inner protector (50) is supported on the back surface side of the outer protector (70).
An opening (55) is formed in the inner protector (50).
The protector stays (60, 61) are fixed to the muffler (32).
The saddle-type vehicle according to claim 2, wherein the outer protector (70) is supported by the protector stays (60, 61) exposed outward from the opening (55). Exhaust device.
The outer protector (70) is rubber-mounted by an annular grommet (75) with respect to the protector stays (60, 61) extending outward in the vehicle width direction from the muffler (32).
The outer protector (70) is provided with an opening (70a) that engages with an annular groove (75a) formed on the outer peripheral surface of the grommet (75).
A support plate (73) having a support opening (73a) having the same diameter as the opening (70a) is fixed to the outer protector (70).
The invention according to any one of claims 1 to 3, wherein the opening (70a) and the support opening (73a) are overlapped with each other and engaged with the annular groove (75a) of the grommet (75). Exhaust system for saddle-mounted vehicles.
Two protector stays (60, 61) are provided apart from each other in the longitudinal direction of the muffler (32).
3. The third aspect of the present invention, wherein a fastening member (51) for attaching the inner protector (50) to the outer protector (70) is arranged between the two protector stays (60, 61). The exhaust device for a saddle-mounted vehicle according to 4.
Two fastening members (51) are provided between the two protector stays (60, 61), and each is arranged at a position closer to the protector stays (60, 61). The exhaust device for a saddle-mounted vehicle according to claim 5.
The catalyst device (34) of the exhaust device (30) is provided in the middle of the exhaust pipes (33, 37) located on the upstream side of the muffler (32), according to claims 1 to 6. Exhaust device for saddle-mounted vehicle according to any of the above.
The exhaust device for a saddle-type vehicle according to any one of claims 1 to 7, wherein the front end portion of the outer protector (70) extends to the front of the muffler (32) in a side view of the vehicle body. ..
The exhaust device for a saddle-mounted vehicle according to claim 8, wherein the front end portion of the outer protector (70) extends to a position overlapping the exhaust pipe (33) in a side view of the vehicle body.