JPH02197484A - Side cover heat shielding device for motorcycle - Google Patents

Abstract

PURPOSE:To prevent a side cover from heating by providing a heat shielding plate between the outer side surface of an exhaust pipe and the side cover and forming a circulating path of head-on air. CONSTITUTION:In space surrounded by a rear arm bracket 6, seat rail 8 and a frame 60, a heat shielding plate 64 is arranged so as to partition between an exhaust pipe 26 and a side cover 34, while a head-on air passage 70 is formed between the heat shielding plate 64 and the side cover 34. By this constitution, heat of the exhaust pipe 26 can be suppressed from heating the side cover.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a heat shielding device for a motorcycle that shields heat from an engine exhaust pipe toward a side cover.

(Prior Art) Conventionally, some motorcycles are equipped with a seat on the body frame and an engine exhaust pipe extending rearward below the seat.In this case, the rider's legs on the seat are In order to prevent the exhaust pipe from being heated by the heat from the exhaust pipe, some exhaust pipes have a side cover covering the outside surface (
For example, Japanese Patent Application No. 62-168812 and drawings).

(Problem to be Solved by the Invention) In the case of the above configuration, the running wind flows along the exhaust pipe while the motorcycle is running, which prevents the exhaust pipe from heating the side cover. be done. However, when idling or at low speeds, there is insufficient airflow and the radiant heat from the exhaust pipe heats the side cover, which heats the rider's legs on the seat, making it undesirable for I/X.

(Objective of the Invention) This invention was made in view of the above-mentioned circumstances, and it is an object of the present invention to prevent the side cover from being heated by the exhaust pipe, regardless of the running condition of the motorcycle. With the goal.

(Structure of the Invention) The features of the present invention for achieving the above object are that a heat shield plate is provided to partition between the outer surface of the exhaust pipe and the side cover, and a heat shield plate is provided between the side cover and the heat shield plate. The main feature is that a space is formed in the space, and this space is used as a flow path for the traveling air.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In Figures 1 to 4, 1 in Figure 2 is a motorcycle;
2 is its body frame. The vehicle body frame 2 has a head vibrator 3 at the front thereof, and a pair of left and right main frames 4.4 extend rearward and downward from the head vibrator 3.
A rear arm bracket 6 extends downward from the rear end of each main frame 4. Further, these left and right rear arm brackets 6.6 are firmly connected to each other by upper and lower cross members 7.7.

Furthermore, a pair of left and right seat rails 8.8 extend rearward and upward from the rear end of the main frame 4. A front cross member 8a, an intermediate cross member 8b, and a rear cross member 8 firmly connect the left and right seat rails 8.8 to each other.
c is provided, and a backstay 9 that reinforces this seat rail 8.8 is also provided. Then, a seat 10 and a tandem seat lOa in which the seat rail 8 is lined up front and rear
and supports. Further, at this time, the seat IO is supported on the seat rail 8 via the buffer material 10c.

A front fork 11 is supported on the head vibrator 3 so as to be steerable. A front wheel 12 is supported at the lower end of the front fork 11, and a handle 13 is attached to the upper end of the front fork 11. On the other hand, a rear arm 15 is pivotally supported on the left and right rear arm brackets 6.6 by a pivot shaft 14 so as to be vertically swingable, and a rear wheel 16 is supported at the swinging end of this rear arm 15. Also.

A shock absorber 17 is interposed between the upper cross member 7 and the rear arm 15.

18 is a 2-cycle parallel 2 for driving the rear wheels 16
This engine 18 is a cylinder engine and is fastened to the main frame 4 and upper and lower cross members 7.7 with bolts 19. A pair of left and right cylinders 21 and 21 protrude upward and forward from the crankcase 20 of the engine 18. A carburetor 22 is attached to the front side of each cylinder 21, respectively. A surge tank 23a is attached to both carburetors 22, an intake pipe 23 extends upward from the surge tank 23a, and an air cleaner 24 is attached to the upper end of this intake pipe 23. In this case, this air cleaner 24 has a reinforcing plate 25 connecting the left and right main frames 4.4.
This reinforcing plate 25 is supported above and extends substantially horizontally.

On the other hand, exhaust pipes 26 are provided to protrude rearward from the rear side of the cylinder 21, respectively. The exhaust pipe 26 extends rearward above the crankcase 20 below the seat 10, passing between the left and right brackets 4a and between the left and right rear arm brackets 6.6. Each of the exhaust pipes 26 has a silencer 26a at its rear end, and the silencer 26a is screwed to the rear end of the seat rail 8 with a bolt 26b.

A fuel tank 27 for supplying fuel to the carburetor 22 is provided. This fuel tank 27 has a cushioning material 2 on the front part of the head vibe 3, the main frame 4.4, and the seat rail 8.
8. A recess 29 is formed in the lower front surface of the fuel tank 27, and the air cleaner 24 is housed in the recess 29.

31 is a radiator for cooling the engine 18, and 32 is a resin cowling. This cowling 32 includes a front cowl 32a that covers the front of the vehicle body, and left and right side cowls that extend rearward from both left and right sides of this front cowl 32a. 32b, 32
b, and this cowling 32 is attached to the vehicle body frame 2.
It is detachably attached to the side with a bolt (not shown). Each side cowl 32b is connected to the main frame 4. Engine 18, intake pipe 23, and air cleaner 2
It covers each of the 4th magnitude from the outside.

A resin side cover 34 is provided to cover each outer surface of the left and right exhaust pipes 26, 26 in the vehicle width direction, and a heat insulating material 34a is affixed almost entirely to the inner surface of each side cover 34. .

A pair of upper and lower exhaust ports 35 and 36 are formed in the front and rear middle portions of each side cover 34. Also.

A resin cover 37 is provided to connect the rear ends of the left and right exhaust pipes 26, 26. A pair of left and right through holes 38, 38 are formed in this rear cover 37, and the tail vibe of each silencer 26a passes through these through holes 38 and projects rearward. Further, a pair of left and right rear exhaust ports 39 and 39 are formed in the upper part of the same cover 37.

3, 4, and 6 to 8, the sheet 10. A heat shield plate 42 made of resin is provided to partition between the tandem seat 10a% and the fuel tank 27, and the left and right exhaust pipes 26.26, and this heat shield plate 42 is composed of a front plate 43 and a rear plate 44. There is.

The front part of the front plate 43 is located between the left and right main frames 4.4 and extends to a position corresponding to the front end of the exhaust pipe 26, and the front part has a flat U-shape when viewed from the front. It is screwed to each main frame 4 with bolts 45. Further, the front and rear midway portions of the front plate 43 are connected to the left and right seat rails 8.
．． 8 and placed on the front cross member 8a.

47 is an opening formed in the front plate 43, and this opening 47 is formed so that the front plate 43 does not come into contact with a member for supporting the rear part of the fuel tank 27 on the front cross member 8a. Further, the rear part of the front plate 43 is located between the left and right seat rails 8.8, and is connected to the intermediate cross member 8.
b with a bolt 48.

In the above case, a gap is created between the left and right seat rails 8.8 and the front and rear image side edges of the front plate 43, but an elastic plate 49 made of rubber is provided to close this gap. A locking protrusion 50 is integrally protruded on the elastic plate 49, and each of the locking protrusions 50 is elastically fitted into a locking hole 51 formed in the front plate 43, whereby each elastic plate 49 is attached to the front plate 43. The outer edge of each elastic plate 49 is elastically pressed against the corresponding seat rail 8.

On the other hand, the rear plate 44 is also located between the left and right seat rails 8.8, and its front edge is removably fitted into a fitting groove 53 attached to the intermediate cross member 8b. It is screwed to the rail 8, and the rear end of the rear plate 44 is screwed to the rear cross member 8c with bolts 55.

The heat shield plate 42 insulates the radiant heat from each exhaust pipe 26 and prevents each seat 1, 1, a and the fuel tank 27 from being heated.

Further, a space is formed between the lower surfaces of the two seats IO and IOa, the fuel tank 27, and the upper surface of the heat shield plate 42, and this space is connected from each exhaust pipe 26 to each seat 10.1oa and the fuel tank 27. It acts as an insulating layer when heat is transferred. Further, this space is used as a flow path 57 for traveling air.

In FIGS. 1, 2, right, and 5, reinforcing members 59 are provided for reinforcing each of the seat rails 8, respectively. This reinforcing member 59 has front and rear frames 60 and 61 made of sheet metal and each having a box-shaped cross section.The upper end of the front frame 6o is screwed to the front and rear part of the seat rail 8 with a bolt 62, and the lower end extends backwards and downwards. On the other hand, the upper end of the rear frame 61 is screwed to the front and rear midpoints of the seat rail 8 with bolts 63, and the lower end thereof extends downward and forward and is firmly welded to the lower end of the front frame 60. In this case, the reinforcing material 59
The front frame 6o is also covered by the side cover 34, and the front frame 6o is curved in an arc shape along the inner surface of the side cover 34. 65 is a footrest, and this footrest 65 is for a passenger on the tandem seat 10a.

In FIG. 1 and FIGS. 5 to 8, in side view,
Another heat shield plate 64 made of resin is provided in a space surrounded by the rear arm bracket 6, the seat rail 8, and the front frame 6o. This heat shield plate 64 partitions between the outer surface of the exhaust pipe 26 and the side cover 34, and the part of the side cover 34 corresponding to the rider's legs on the seat 10 is connected to the exhaust pipe 26. prevent heating by radiant heat.

In the above case, the heat shield plate 64 is supported on the vehicle body frame 2 side in the following manner. That is, as shown in FIGS. 1 and 6, the front lower end of the heat shield plate 64 is overlapped with the side cover 34 and is fastened together to the rear arm bracket 6 with bolts 66.

Further, as shown in FIG. 1, the rear lower end of the heat shield plate 64 is also overlapped with the side cover 34 and fastened together with the front frame 60 by bolts 67. Furthermore, as shown in FIGS. 1, 7, and 8, the front and rear middle portions of the heat shield plate 64 are fitted with locking tools 6.
8 to the inner surface of the side cover 34.

In addition, the above rear arm bracket 6, seat rail 8,
Although there is a gap between the front frame 60 and the heat shield plate 64, an elastic plate 69 made of rubber is provided to close this gap. One end of the elastic plate 69 is elastically fitted onto the edge of the heat shield plate 64, and the other end is elastically pressed against the rear arm bracket 6 or the like.

The heat shield plates 64 shield radiant heat from the exhaust pipes 26 toward the side covers 34, and cooperate with the heat insulating material 34a to prevent the side covers 34 from being heated.

A space is formed between the side cover 34 and the heat shield plate 64. This space functions as a heat insulating layer when heat is transmitted from each exhaust pipe 26 to each side cover 34. This space also serves as another flow path 70 for the running air.
It is said that

As shown in FIGS. 3 and 4, when the motorcycle 1 is running, the running wind (arrow A in the figures) that has passed between the upper surface of the radiator 31 and the lower surface of the reinforcing plate 25 is transferred to the fuel tank. 27 and the upper surface of the front end of the heat shield plate 42 (arrow B in the figure), this traveling wind flows backward through the flow passage 57 (arrow C in the figure).
The air is discharged to the rear of the vehicle body through the through hole 38 and the rear exhaust port 39 (arrow D in the figure). Note that when the motorcycle 1 is running at a low speed, the force of the running wind flowing through the flow passage 57 is weak. Therefore, most of it is discharged through the upper exhaust port 35 (arrow E in the figure).Then, due to the traveling wind flowing through this flow path 57, each sheet sea) 10.10a,
The fuel tank 27 and the heat shield plate 42 are each cooled. ,
On the other hand, the traveling wind (arrow F in the figure) that has passed through or below the radiator 31 flows along each exhaust pipe 26 to cool it.

Note that, since the front end of the heat shield plate 42 extends to a position corresponding to the front end of the exhaust pipe 26, the running wind that cools each exhaust pipe 26 flows into the flow passage 57 from the front end of the flow passage 57. is prevented. Also, part of the wind flowing backward between the left and right side covers 34, 34 is exhausted through the lower exhaust port 36 (arrow G in the figure), or is discharged from the lower edge of the side cover 34. It passes through and is discharged (arrow H in the figure).

Further, as described above, a part of the traveling wind flowing backward between the left and right side covers 34, 34 flows through another flow path 70 as shown by arrow I in FIG.
and the heat shield plate 64 are cooled.

Note that the heat shield plate 42 and the left and right heat shield plates 64, 64 may be integrally molded as shown by imaginary lines in FIG.

(Effects of the Invention) According to the present invention, a heat shield plate is provided that partitions the outer surface of the exhaust pipe and the side cover, so that no matter what driving condition the motorcycle is in, there is no airflow from the exhaust pipe. The heat shield plate prevents radiant heat from reaching the side cover.

Further, since a space is formed between the side cover and the heat shield plate, the space functions as a heat insulating layer when heat is transmitted from the exhaust pipe to the side cover. Therefore, even when the motorcycle is idling or traveling at low speed, the side cover is prevented from being heated.

Furthermore, when the motorcycle is normally running, the exhaust pipe generates a large amount of heat compared to when idling, but since the above space is used as a flow path for the running air, the heat is effectively cooled by the running wind, and the side cover Heating is reliably suppressed.

Therefore, no matter what the riding condition of the motorcycle is, the side cover is effectively prevented from being heated by the exhaust pipe, that is, the rider's legs on the seat are prevented from being heated. Ru.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a partially enlarged view of Fig. 2, Fig. 2 is a side view of the motorcycle, Fig. 3 is a partially enlarged sectional view of Fig. 2, and Fig. 4 is a plan view. 5 is a sectional view taken along the line V-V in FIG. 1, and FIG.
7 is a cross-sectional view taken along the line ■--■ in FIG. 1, and FIG. 8 is a cross-sectional view taken along the line ■--■ in FIG. 1. l...Motorcycle, 18...Engine, 26...Exhaust pipe, 34...Side cover 64...Heat shield plate, 70...Flow passage.

Claims (1)

[Claims] 1. In a motorcycle equipped with a side cover that covers the outer surface of the exhaust pipe of the engine, a heat shield plate is provided to partition between the outer surface of the exhaust pipe and the side cover, and a heat shield plate is provided between the side cover and the heat shield plate. A side cover heat shielding device for a motorcycle, which forms a space in the space and uses this space as a flow path for running air.