WO2021079706A1

WO2021079706A1 - Saddle-type vehicle

Info

Publication number: WO2021079706A1
Application number: PCT/JP2020/037153
Authority: WO
Inventors: アタユットトンデー
Original assignee: 本田技研工業株式会社
Priority date: 2019-10-21
Filing date: 2020-09-30
Publication date: 2021-04-29
Also published as: JPWO2021079706A1; JP7212800B2

Abstract

A saddle-type vehicle (10) in which an exhaust pipe is passed through a position higher than a footrest where a foot of a rider rests and extends toward the rear comprises: an engine (38); a step (34) where the foot of the rider rests, the step (34) being disposed more toward the rear with respect to the direction of travel of the vehicle than an exhaust port (39a) of the engine (38); an exhaust pipe (42) that is connected to the exhaust port (39a) and that is disposed extending toward the rear with respect to the direction of travel of the vehicle and passing above the step (34); and a catalyst accommodation unit (48) disposed partway along the exhaust pipe (42), forward from the step (34) with respect to the direction of travel of the vehicle. The exhaust pipe (42) has a catalyst downstream pipe portion (42b) on the downstream side from the catalyst accommodation unit (48), and an inner-side heat guard (56) disposed covering the exhaust pipe (42) from an inner side with respect to the vehicle-width direction is provided in the catalyst downstream pipe portion (42b).

Description

Saddle-type vehicle

The present invention relates to a saddle-mounted vehicle having an exhaust catalyst upstream of the exhaust pipe.

Conventionally, a saddle-mounted vehicle equipped with an exhaust catalyst upstream of the exhaust pipe has been proposed. For example, in Japanese Patent Application Laid-Open No. 2006-194113, an exhaust catalyst is provided in the upstream portion of the exhaust pipe, and the exhaust pipe on the downstream side of the exhaust catalyst is passed backward through a position above the step on which the driver's foot is placed. A saddle-type vehicle with a structure arranged so as to extend is shown.

In the exhaust catalyst, an exothermic reaction occurs and the temperature of the exhaust gas rises, so the temperature of the exhaust pipe on the downstream side of the exhaust catalyst rises. Therefore, in the saddle-mounted vehicle of Japanese Patent Application Laid-Open No. 2006-194113, the exhaust pipe above the step is covered with a cover in order to protect the legs of the driver.

However, in a conventional saddle-mounted vehicle, it is necessary to arrange the cover so that the exhaust pipe and the driver's leg are sufficiently separated from each other, and the space through which the driver's leg passes is pushed to the outside in the vehicle width direction. It tends to impair habitability.

An object of the present invention is to improve the habitability of a driver in a saddle-type vehicle in which an exhaust pipe is arranged so as to extend rearward through a position above the step on which the driver's foot is placed.

One aspect of the present invention is a step in which the engine and the driver's foot are placed behind the exhaust port of the engine in the vehicle traveling direction, and the step is connected to the exhaust port and passed above the step. The exhaust pipe includes an exhaust pipe extending rearward in the vehicle traveling direction and a catalyst accommodating portion provided in the middle of the exhaust pipe in front of the step in the vehicle traveling direction, and the exhaust pipe accommodates the catalyst. A saddle-type vehicle having a catalyst downstream pipe portion on the downstream side of the portion, and the catalyst downstream pipe portion is provided with an inner heat guard arranged so as to cover the exhaust pipe from the inside in the vehicle width direction. It is in.

In the saddle-mounted vehicle according to the above viewpoint, the catalyst downstream pipe portion of the exhaust pipe is provided with an external heat guard arranged so as to cover the exhaust pipe from the outside in the vehicle width direction, and the external heat guard and the exhaust pipe. An intermediate heat guard provided between the and may be provided.

In the saddle-mounted vehicle from the above viewpoint, the inner heat guard and the intermediate heat guard may be integrally formed.

In the saddle-mounted vehicle according to the above viewpoint, the inner heat guard and the intermediate heat guard are coaxial with the catalyst downstream pipe portion of the exhaust pipe and in the radial direction from the catalyst downstream pipe portion of the exhaust pipe. It may be composed of a tubular outer cylinder member arranged apart from each other.

In the saddle-mounted vehicle from the above viewpoint, the outer cylinder member may be provided with a communication hole for communicating the space between the exhaust pipe and the outside air.

In the saddle-mounted vehicle from the above viewpoint, the external heat guard may be supported by the outer cylinder member.

In the saddle-mounted vehicle according to the above viewpoint, the catalyst accommodating portion is accommodated in a tubular container body, and the axis of the container body is inclined so that the downstream side is closer to the inside in the vehicle width direction than the upstream side. It may be arranged.

In the saddle-mounted vehicle of the above viewpoint, the portion of the exhaust pipe downstream of the catalyst in the catalyst downstream pipe portion may be inclined so that the downstream side of the exhaust pipe is separated from the upstream side in the vehicle width direction.

According to the saddle-mounted vehicle from the above viewpoint, the heat transfer to the vehicle body parts is suppressed by the inner heat guard, and the exhaust pipe can be arranged near the vehicle body, so that the driver's comfortability is improved.

Further, by providing an intermediate heat guard between the external heat guard and the exhaust pipe, the external heat guard can be arranged close to the exhaust pipe, and the external heat guard can be arranged close to the inside in the vehicle width direction. it can. As a result, the habitability of the driver is improved.

Furthermore, the number of parts can be reduced by integrally forming the inner heat guard and the intermediate heat guard.

Furthermore, the structure is simplified by configuring the inner heat guard and the intermediate heat guard as outer cylinder members.

Furthermore, the surface temperature can be lowered by exchanging air with the exhaust pipe through the communication hole of the outer cylinder member.

Furthermore, by fixing the external heat guard to the outer cylinder member, it is possible to prevent the heat of the exhaust pipe from being directly transferred to the external heat guard, and it is possible to suppress the temperature rise of the external heat guard.

Further, since the axis of the container body is inclined so that the downstream side is closer to the inside in the vehicle width direction than the upstream side, the catalyst downstream pipe portion of the exhaust pipe can be arranged inside in the vehicle width direction. , The habitability of the driver can be improved.

Further, in the catalyst downstream pipe portion of the exhaust pipe, the portion behind the step is inclined so that the downstream side of the exhaust pipe is separated from the upstream side in the vehicle width direction. It can be placed inside in the width direction of the vehicle, improving the comfort of the driver.

It is a side view on the right side of a motorcycle. It is a side view which shows the state which the appearance heat guard was removed from the exhaust device of FIG. It is a figure which shows the catalyst upstream pipe part of the exhaust pipe with the bottom view in the state which a part of the engine guard is removed from the motorcycle of FIG. It is a partially enlarged sectional view of the part shown by the IV-IV line of FIG. It is a figure which shows the layout of the exhaust system seen from the front side cut by the VV line of FIG. FIG. 1 is a top view of the motorcycle in FIG. 1 in a state where the heat guard is removed. 7A is a view showing the mounting structure of the heat shield cover and the outer protector of FIG. 1, FIG. 7B is a cross-sectional view taken along the line VIIB-VIIB of FIG. 2, and the mounting structure of the heat shield cover of FIG. 7A is shown. Shown, FIG. 7C is a cross-sectional view showing the mounting structure of the outer protector along the VIIC-VIIC line of FIG. 7A.

Hereinafter, the saddle-mounted vehicle according to the present invention will be described in detail below with reference to the attached drawings, with reference to suitable embodiments.

[1. Outline configuration of motorcycle 10]
FIG. 1 is a right side view of a motorcycle 10 as a saddle-mounted vehicle according to the present embodiment. In the present embodiment, the front-rear, left-right, and up-down directions of the motorcycle 10 will be described with reference to the direction seen from the driver seated on the seat 12 of the motorcycle 10. Further, the pair of left and right components may be described by adding a reference number of "L" to the reference number of the left component and an "R" to the reference number of the right component.

The motorcycle 10 has a vehicle body 14. The vehicle body 14 includes a head pipe 16, a down frame 18 extending diagonally downward from the head pipe 16 (see FIG. 5), a pivot plate 19 extending downward from the lower end of the down frame 18, and a pivot plate 19 toward the rear. A pair of

swing arms

20L and 20R extending in the left-right direction and a rear frame 22 extending upward and rearward from the rear end of the down frame 18 are provided.

The head pipe 16 supports a pair of left and right

front forks

24L and 24R so as to be steerable. A bar handle 26 steered by the driver is attached to the upper part of the head pipe 16. The front wheels 28 are rotatably supported at the lower ends of the

front forks

24L and 24R. An engine guard 30 that covers the front and the bottom of the engine 38 is attached to the down frame 18. The rear end of the engine guard 30 is joined to the engine mounting frame 31. The engine mounting frame 31 supports step 34 on which the driver rests his / her foot. Further, the

swing arms

20L and 20R are provided with a tandem step 35 on which the feet of an occupant seated on the loading platform 37 (rear seat) are placed. The rear frame 22 supports the seat 12, the fuel tank 32 under the seat 12, the loading platform 37 behind the seat 12, and the like. The down frame 18 and the rear frame 22 are covered with a vehicle body cover 36.

The vehicle body 14 supports the engine 38 downward. The engine 38 includes a cylinder 39 arranged so as to project substantially horizontally from the crankcase 41 toward the front, and an exhaust port 39a is provided on the lower side of the cylinder 39. The exhaust pipe 42 of the exhaust device 40 is connected to the exhaust port 39a. The exhaust device 40 is arranged on the right side of the engine 38. The exhaust device 40 has an exhaust pipe 42 whose front end is connected to the exhaust port 39a of the engine 38. A silencer 44 that silences the exhaust noise from the exhaust port 39a of the engine 38 is connected to the rear end of the exhaust pipe 42. The silencer 44 is a substantially cylindrical muffler, and extends slightly diagonally upward and backward to the right of the rear wheel 46. On the right side of the silencer 44, a heat shield cover 50 is attached to the silencer 44 by fastening means such as a stay 66 (see FIG. 7A) and a bolt 70 (see FIG. 7B). Further, a resin outer protector 52 is provided on the outside of the heat shield cover 50.

[2. Configuration of exhaust device 40]
Next, the configuration of the exhaust device 40 of the motorcycle 10 according to the present embodiment will be described with reference to FIGS. 2 to 6.

As shown in FIG. 2, the exhaust pipe 42 of the exhaust device 40 passes through the right side portion of the engine 38 and extends upward toward the vehicle body 14 ahead of the step 34. The exhaust pipe 42 bends rearward at the side of the vehicle body cover 36 of the vehicle body 14, passes above the step 34, and extends rearward. A catalyst accommodating portion 48 accommodating an exhaust catalyst is interposed in the exhaust pipe 42, and the exhaust pipe 42 is a catalyst upstream pipe portion 42a on the upstream side of the catalyst accommodating portion 48 and a catalyst downstream portion on the downstream side of the catalyst accommodating portion 48. It is composed of a pipe portion 42b. The catalyst accommodating portion 48 is provided in the vicinity of the engine 38 in front of the step 34.

The catalyst upstream pipe portion 42a is composed of a single-layer structure single pipe, and as shown in FIG. 3, the upstream end portion is connected to the exhaust port 39a at the lower end portion of the engine 38. The catalyst upstream pipe portion 42a bends and extends below the engine 38 toward the right side of the vehicle body 14, and its downstream end is connected to the catalyst accommodating portion 48. The catalyst upstream pipe portion 42a is not limited to a single pipe, and may be formed of a double pipe.

As shown in FIG. 2, the catalyst accommodating portion 48 is arranged in front of step 34. The catalyst accommodating portion 48 has a cylindrical container body 54, and an exhaust catalyst that reacts unburned organic substances in the exhaust gas with oxygen is housed inside the container body 54. The axis A of the container body 54 (catalyst accommodating portion 48) is inclined toward the rear upper side of the vehicle body 14 on the downstream side of the catalyst accommodating portion 48 when viewed from the right side. Further, as shown in FIG. 5, the axis A of the catalyst accommodating portion 48 is inclined inward in the vehicle width direction on the downstream side from the upstream side in the front view. VL indicates a vertical straight line.

The catalyst downstream pipe portion 42b of the exhaust pipe 42 is connected to the upper end (downstream end) of the catalyst accommodating portion 48. The upstream side of the catalyst downstream pipe portion 42b is arranged inside in the vehicle width direction with respect to the downstream end portion of the catalyst upstream pipe portion 42a. As shown in FIG. 4, the catalyst downstream pipe portion 42b includes an inner heat guard 56 arranged inside the exhaust pipe 42 in the vehicle width direction and an intermediate heat guard 58 arranged outside the exhaust pipe 42 in the vehicle width direction. Be prepared. The inner heat guard 56 and the intermediate heat guard 58 form a tubular outer cylinder member 60 that is coaxial with the catalyst downstream pipe portion 42b and is arranged radially outward from the catalyst downstream pipe portion 42b. ing. That is, the catalyst downstream pipe portion 42b of the exhaust pipe 42 has a double pipe structure. The outer cylinder member 60 is provided with a communication hole 43 (see FIG. 2) for communicating the space between the inner cylinder member 60 and the outside air.

Further, an external heat guard 62 is provided on the outside of the intermediate heat guard 58 in the vehicle width direction. As shown in FIG. 1, the appearance heat guard 62 is a heat guard that appears on the appearance of the right side surface of the vehicle body 14, and covers the outside of the catalyst downstream pipe portion 42b and the catalyst accommodating portion 48. One end of the external heat guard 62 is joined to the outer cylinder member 60 via the stay 42c of FIG. 2 in order to prevent the temperature rise near the upper part of the step 34 where the driver's foot is arranged. Further, the other end of the external heat guard 62 is joined to the container body 54 of the catalyst accommodating portion 48 via a stay 42d.

The downstream end of the catalyst downstream pipe portion 42b is connected to the silencer 44. As shown in FIG. 6, the axis B of the catalyst downstream pipe portion 42b near the silencer 44 is inclined so that the downstream end portion is separated outward in the vehicle width direction. As shown in the figure, the exhaust pipe 42 is arranged closer to the inside in the vehicle width direction at least in the vicinity of the upper part of the step 34 in which the driver places his / her foot.

The inner heat guard 56 and the intermediate heat guard 58 may not be formed in a tubular shape as shown in FIG. 4, and may be formed in a C shape, for example. Further, the inner heat guard 56 and the intermediate heat guard 58 may be formed as separate bodies, and each may be joined to the exhaust pipe 42.

[3. Configuration of silencer 44]
Next, the configuration of the silencer 44 of the motorcycle 10 of the present embodiment and its surroundings will be described.

As shown in FIG. 1, a silencer 44 is connected to the downstream end of the exhaust pipe 42. The silencer 44 is made of a substantially cylindrical muffler, and a heat shield cover 50 is provided so as to cover the outer peripheral portion of the silencer 44. As shown in FIGS. 7A and 7B, a stay 66 projecting outward is provided at a predetermined position of the silencer 44, and the mounting portion 68 of the heat shield cover 50 is brought into contact with the stay 66, and further. The stay 66 and the mounting portion 68 are fastened with bolts 70. In this way, the heat shield cover 50 is arranged apart from the outside of the silencer 44.

The heat shield cover 50 is made of a metal plate such as a semicircular chrome-plated steel plate formed by press molding, and includes a plurality of holes 72 arranged in a checkered pattern. The hole 72 of the heat shield cover 50 constitutes a mounting structure for the outer protector 52. That is, as shown in FIG. 7C, a mounting protrusion 74 provided on the back surface side of the outer protector 52 is inserted into the hole 72, and the mounting protrusion 74 is joined to the hole 72 by welding caulking.

The outer protector 52 is arranged so as to cover the area close to the feet of the occupant seated in the rear seat. The shape and color of the outer protector 52 can be appropriately changed as needed for the appearance design. Since the heat shield cover 50 is provided with a plurality of holes 72 in advance, the degree of freedom of the fixed position of the outer protector 52 is high, and it becomes easy to respond to the change of the fixed position of the outer protector 52.

[4. Effect of this embodiment]
As described above, the present embodiment is arranged behind the engine 38 and the exhaust port 39a of the engine 38 in the vehicle traveling direction, and is connected to the step 34 on which the driver's foot is placed and the exhaust port 39a. , An exhaust pipe 42 arranged to extend rearward in the vehicle traveling direction through a position above step 34, and a catalyst accommodating portion 48 provided in the middle of the exhaust pipe 42 in front of the vehicle traveling direction from step 34. It relates to the provided motorcycle 10 (saddle-type vehicle).

In the motorcycle 10, the exhaust pipe 42 has a catalyst downstream pipe portion 42b on the downstream side of the catalyst accommodating portion 48, and the catalyst downstream pipe portion 42b is arranged so as to cover the exhaust pipe 42 from the inside in the vehicle width direction. An inner heat guard 56 is provided to prevent heat conduction to the vehicle body parts.

According to this configuration, the catalyst downstream pipe portion 42b of the exhaust pipe 42 can be arranged close to the vehicle body cover 36, and as a result, the catalyst downstream pipe portion 42b and its appearance heat guard 62 are arranged inside in the vehicle width direction. Therefore, the habitability of the driver is improved.

Further, the catalyst downstream pipe portion 42b of the exhaust pipe 42 is provided between the external heat guard 62 arranged so as to cover the exhaust pipe 42 from the outside in the vehicle width direction, and between the external heat guard 62 and the exhaust pipe 42. An intermediate heat guard 58 is provided. By providing the intermediate heat guard 58 in this way, the external heat guard 62 can be arranged close to the exhaust pipe 42, and the external heat guard 62 can be arranged close to the inside in the vehicle width direction. As a result, the habitability of the driver is improved.

Further, the inner heat guard 56 and the intermediate heat guard 58 may be integrally formed. Further, the inner heat guard 56 and the intermediate heat guard 58 are arranged coaxially with the catalyst downstream pipe portion 42b of the exhaust pipe 42 and radially separated from the catalyst downstream pipe portion 42b of the exhaust pipe 42. It may be composed of a tubular outer cylinder member 60. As a result, the structure can be simplified and the number of parts can be reduced.

Further, the outer cylinder member 60 may be provided with a communication hole 43 for communicating the space between the exhaust pipe 42 and the outside air. With this configuration, the air between the outer cylinder member 60 and the exhaust pipe 42 is exchanged through the communication hole 43 of the outer cylinder member 60, so that the temperature rise of the outer cylinder member 60 is suppressed and the heat shielding property is improved.

Further, since the external heat guard 62 is supported by the outer cylinder member 60, it is possible to prevent the heat of the exhaust pipe 42 from being directly transferred to the external heat guard 62, and prevent the temperature of the external heat guard 62 from rising. be able to.

Further, the catalyst accommodating portion 48 is accommodated in the tubular container body 54, and the axis A of the container body 54 (catalyst accommodating portion 48) is inclined so that the downstream side is closer to the inside in the vehicle width direction than the upstream side. Are arranged. As a result, the catalyst downstream pipe portion 42b of the exhaust pipe 42 can be arranged inside in the vehicle width direction, and the comfortability of the driver is improved.

Further, in the catalyst downstream pipe portion 42b of the exhaust pipe 42, the portion behind the step 34 is inclined so that the axis B thereof is separated from the upstream side to the downstream side in the vehicle width direction. As a result, the exhaust pipe 42 and the external heat guard 62 can be arranged at least inside the silencer 44 in the vehicle width direction at the portion where the driver's legs are arranged, so that the driver's comfortability is improved.

Although the present invention has been described above using suitable embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various changes or improvements can be made to the above embodiments. It is clear from the claims that the form with such modifications or improvements may also be included in the technical scope of the present invention. Further, the reference numerals in parentheses described in the claims are attached following the reference numerals in the accompanying drawings for the purpose of facilitating the understanding of the present invention, and are limited to the elements to which the present invention has the reference numerals. It is not interpreted as being done.

Claims

With the engine (38)
A step (34) in which the driver's foot is placed behind the exhaust port (39a) of the engine (38) in the vehicle traveling direction, and
An exhaust pipe (42) that is connected to the exhaust port (39a) and is arranged so as to extend rearward in the vehicle traveling direction through above the step (34).
A catalyst accommodating portion (48) provided in the middle of the exhaust pipe (42) in front of the step (34) in the vehicle traveling direction is provided.
The exhaust pipe (42) has a catalyst downstream pipe portion (42b) on the downstream side of the catalyst accommodating portion (48), and the catalyst downstream pipe portion (42b) is provided with the exhaust pipe (42). A saddle-mounted vehicle (10) provided with an inner heat guard (56) arranged so as to cover from the inside in the width direction.
The saddle-mounted vehicle (10) according to claim 1, wherein the catalyst downstream pipe portion (42b) of the exhaust pipe (42) covers the exhaust pipe (42) from the outside in the vehicle width direction. A saddle-mounted vehicle (10) comprising an arranged external heat guard (62) and an intermediate heat guard (58) provided between the external heat guard (62) and the exhaust pipe (42). ..
The saddle-mounted vehicle (10) according to claim 2, wherein the inner heat guard (56) and the intermediate heat guard (58) are integrally formed.
The saddle-mounted vehicle (10) according to claim 3, wherein the inner heat guard (56) and the intermediate heat guard (58) are the catalyst downstream pipe portion (42b) of the exhaust pipe (42). A saddle-type vehicle (10) that is coaxial and is composed of a tubular outer cylinder member (60) that is radially spaced from the catalyst downstream pipe portion (42b) of the exhaust pipe (42). ).
The saddle-mounted vehicle (10) according to claim 4, wherein the outer cylinder member (60) is provided with a communication hole (43) for communicating the space between the exhaust pipe (42) and the outside air. A saddle-mounted vehicle (10).
The saddle-mounted vehicle (10) according to claim 4 or 5, wherein the external heat guard (62) is supported by the outer cylinder member (60).
The saddle-mounted vehicle (10) according to any one of claims 1 to 6, wherein the catalyst accommodating portion (48) is accommodated in a tubular container body (54), and the container body is contained. A saddle-mounted vehicle (10) in which the axis of (54) is arranged so as to be inclined so that the downstream side is closer to the inside in the vehicle width direction than the upstream side.
The saddle-mounted vehicle (10) according to any one of claims 1 to 7, wherein the catalyst downstream pipe portion (42b) of the exhaust pipe (42) is rearward of the step (34). Is a saddle-mounted vehicle (10) in which the downstream side is inclined so as to be separated from the upstream side in the vehicle width direction.