JPH02197483A - Heat shielding device for motorcycle - Google Patents

Abstract

PURPOSE:To prevent a seat from being heated by an exhaust pipe by providing a heat shielding plate between the seat and the exhaust pipe and forming between the seat and the heat shielding plate the space serving as a circulating path of ram air. CONSTITUTION:A resin-made heat shielding plate 42 is arranged so as to partition a seat 10, tandem seat 10a and a fuel tank 27 from right and left exhaust pipes 26. This heat shielding plate 42 is constituted of front and rear plates 43, 44, and the front plate 43 is positioned in its front part between right and left main frames 4, 4 and extended to a front end corresponding position of the exhaust pipe 26. The rear plate 44 is positioned between seat rails 8, 8 and mounted in the rear end to a rear cross member 8c. By this constitution, heat of the exhaust pipe 26 is discharged from an exhaust port 39 by the heat shielding plate 42 insulating heat from the exhaust pipe 26 while by a ram air passage 57 being formed between the seats 10, 10a in each lower surface and the heat shielding plate 42 in its upper surface and between the fuel tank 27 in its lower surface and the heat shielding plate 42 in its upper surface. By this constitution, the seats can be prevented from being heated.

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 seat.

(Prior Art) Conventionally, some motorcycles are equipped with a seat on a body frame and an engine exhaust pipe extending rearward below the seat (for example, Japanese Patent Application No. 1986-168).
812 specification 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, so that the exhaust pipe is prevented from heating the seat. Ru. However, when idling or at low speeds, there is insufficient airflow and the radiant heat from the exhaust pipe heats the seat, which is undesirable for the lighter on the seat.

(Object of the Invention) This invention was made in view of the above-mentioned circumstances, and it is possible to effectively heat the seat by the exhaust pipe regardless of the driving condition of the motorcycle. The purpose is to prevent

(Structure of the Invention) The present invention for achieving the above object is characterized by providing a heat shield plate for partitioning between the seat and the exhaust pipe, and forming a space between the seat and the heat shield plate. Moreover, 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 FIGS. 1 to 4, ■ is a motorcycle, and 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, and extend downward from the rear end of each main frame 4. The rear arm bracket 6 extends. 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 is extended. A front cross member 8a, an intermediate cross member \8b, and a rear cross member 8C are provided to firmly connect the left and right seat rails 8.8 to each other, and a back stay 9 is further provided to reinforce the seat rails 8.8. Then, the seat 1O and the tandem seat 1 where the seat rails 8 are lined up front and back
0a is supported. Further, at this time, the seat 10 is supported on the seat rail 8 via the cushioning 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. Further, a shock absorber 17 is interposed between the upper cross member 7 and the rear arm 15.

18 is a two-stroke parallel two-cylinder engine for driving the rear wheels 16; this engine 18 is connected to the main frame 4;
It is fastened to the upper and lower cross members 7.7 by bolts 19.

In the above case, the portion where the engine 18 is fastened to the main frame 4.4 will be explained in detail with particular reference to FIG. 3 and FIG. 3(a). Brackets 4a are respectively provided to protrude downward.

On the other hand, the engine 18 has a crankcase 20 that houses a crankshaft, and a pair of left and right support pieces 20a, 20a protrude from the upper surface of the crankcase 20. The support pieces 20a are screwed to each bracket 4a by the bolts 19.

Further, a rubber annular shock absorber 19a is interposed between the bracket 4a and the bolt 19, and this shock absorber 19a absorbs vibrations transmitted from the engine 18 to the vehicle body frame 2. Further, a buffer body 19b similar to the above is interposed on the surface of the bracket 4a facing the support piece 20a, and this buffer body 19b is connected to the bracket 4a and the support piece 20a.
This prevents collision between a and a.

A pair of left and right cylinders 21, 21 are provided to protrude upward and forward from the crankcase 20. Each cylinder 21
A carburetor 22 is attached to each of the front faces of the two carburetors 22, and a surge tank 23a is attached to both carburetors 22, and an intake pipe 23 extends upward from the surge tank 23a. An air cleaner 24 is attached. In this case, the air cleaner 24 is supported on a reinforcing plate 25 that connects the left and right main frames 4.4, and this reinforcing plate 25 extends substantially horizontally.

On the other hand, an exhaust pipe 26 is provided to protrude rearward from the rear surface side of each cylinder 21 as described above. The exhaust pipe 26 extends rearward above the crankcase 20 below the seat IO, and at this time, the left and right rear arm brackets 6
; Passing between 6 and 6. Further, each exhaust pipe 26 has a silencer 26a at its rear end, and this silencer 26a is attached to a bolt 26 at the rear end of the seat rail 8.
It is screwed by b.

A fuel tank 27 for supplying fuel to the carburetor 22 is provided. This fuel tank 27 includes Heradvib 3, main frame 4.4. and cushioning material 28 on the front of the seat rail 8.
Supported through.

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). The side cowls 32b are connected to the main frame 4, the engine 18. Intake pipe 23 and air cleaner 2
It covers 4th mag from the outside.

A side cover 34 made of resin is provided to cover each outer surface of the left and right exhaust pipes 26, 26 in the vehicle width direction. A pair of upper and lower exhaust ports 3 are provided at the front and rear midpoints of each side cover 34.
5.36 is formed. In addition, the left and right exhaust pipes 26
．． A resin carrier cover 37 is provided that connects the rear ends of the two. A pair of left and right through holes 38, 38 are formed in this rear cover 37, and the tail pipe 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.

1 and 2 and FIGS. 4 to 7, the sheet 10. A heat shield plate 42 made of resin is provided to partition between the tandem seat 10a, the fuel tank 27, and the left and right exhaust pipes 26.26, and the 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. Locking protrusions 50 are integrally protruded from 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.

As a result, 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 blocks radiant heat from each exhaust pipe 26, and prevents each seat 10.10a and fuel tank 27 from being heated.

Further, a space is formed between the lower surfaces of the two seats lo and 10a, 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. That is, in particular, as shown in FIGS. 1 and 4,
When the motorcycle l runs, the running wind (arrow A in the figure) that has passed between the upper surface of the radiator 31 and the lower surface of the reinforcing plate 25 flows between the lower surface of the fuel tank 27 and the upper surface of the front end of the heat shield plate 42. It enters the flow path 57 from between (arrow B in the figure)
), and this running wind flows backward through the flow path 57 (arrow C in the figure), and flows through the through hole 38 and rear exhaust port 39.
It is discharged to the rear of the vehicle through the (arrow D in the figure).
When the motorcycle l is traveling at low speed, the flow path 57
Since the force of the traveling wind flowing through the passageway 57 becomes weak, most of it is discharged through the upper exhaust port 35 (arrow E in the figure). , fuel tank 27. and heat shield plate 4
2 will be cooled respectively.

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).

Incidentally, in the above case, the heat shield plate 42 is also used as a rear fender.

(Effects of the Invention) According to the present invention, since a heat shield plate is provided that partitions the seat and the exhaust pipe, radiant heat from the exhaust pipe is transferred to the seat regardless of the driving condition of the motorcycle. Reaching is prevented.

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

Furthermore, when a motorcycle normally runs, the exhaust pipe generates a large amount of heat, but since the above space is used as a flow path for the running air,
The above heat is effectively cooled by the running wind, and heating of the seat is reliably suppressed.

Therefore, no matter what driving conditions the motorcycle is in, the seat is effectively prevented from being heated by the exhaust pipe.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, FIG. 1 is a partially enlarged view of FIG. 2, FIG. 3(a) is a partially enlarged sectional view of FIG. 3, FIG. 4 is a partially cutaway plan view, FIG. 5 is a partially enlarged view of FIG. 4, and FIG. 6 is a partially enlarged sectional view of FIG. Vl-V
FIG. 7 is a sectional view taken along the line ■--■ in FIG. 5 of the same. l...Motorcycle, 2...Body frame, 4...Main frame, 8...Seat rail, 18...Engine, 26...
・Exhaust pipe, 42. Heat shield plate, 57. Flow path. Figure 3

Claims (1)

[Claims] 1. In a motorcycle equipped with a seat provided on the body frame and an engine exhaust pipe extending rearward below the seat, a heat shield plate is provided to partition the seat and the exhaust pipe, and a heat shield plate is provided between the seat and the exhaust pipe. A heat shielding device for a motorcycle, characterized in that a space is formed between the heat shield plate and the space is used as a flow path for running air.