JPH05221364A - Intake device for motorcycle - Google Patents

Abstract

PURPOSE:To increase an engine output so as to prevent muddy water from easily advancing into an engine by opening an outside air intake port to an upper surface of a rear fender, and also guiding this outside air to an air cleaner connected to the engine. CONSTITUTION:In the second air cleaner 58, the outside air is sucked from an intake box 64, provided integrally with a resin-made rear car body cover 62, through a duct 65, and this suction air is guided to the first air cleaner 54 by a duct 66. Here, the rear car body cover 62 is extended downward from right/left side edges of a driving seat 102 to cover the second air cleaner 58 and an exhaust muffler 76 and also continued from the driving seat 102 to extend rearward, to accompany a rear fender part 62A of covering the upper of a rear wheel 36. A tail lamp 68 protruded almost horizontally rearward is mounted on a rear part of the rear car body cover 62, that is, upper surface of the rear fender part 62A, and an outside air intake port 70 is opened downward of this tail lamp 68.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system applied to a motorcycle equipped with an engine near the center of a vehicle body and having a rear fender continuously extending rearward from a driving seat.

[0002]

2. Description of the Related Art In a motorcycle, a normal engine is mounted between front and rear wheels, and a straddle-type driving seat is arranged behind and obliquely above the engine. A carburetor is connected to the rear surface of the cylinder of this engine, and an air cleaner is arranged behind the carburetor. The outside air intake port of this air cleaner is usually provided on the upper surface or side surface of the air cleaner.

[0003]

[Problems of the prior art] When the outside air intake port is provided on the upper surface of the air cleaner, the outside air intake port is opened on the lower surface of the operation seat or near the side edge of the operation seat, and when it is provided on the side surface of the air cleaner. It will open near the driver's feet.

In any case, at these positions, the air around the engine warmed by the engine is sucked into the air cleaner, which causes a problem that the engine output is reduced.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and does not suck in warm air around the engine but sucks in cool air to increase engine output and muddy water that causes the wheels to bounce up. It is an object of the present invention to provide an intake device for a motorcycle that can make it hard to enter such parts.

[0006]

According to the present invention, an object of the present invention is to mount an engine mounted in the vicinity of the center of the vehicle body between front and rear wheels, a straddle type driving seat disposed obliquely upward and rearward of this engine, and to this driving seat. In a motorcycle including a rear fender that continuously extends rearward and covers an upper portion of a rear wheel, an outside air intake port is opened on an upper surface of the rear fender, and the outside air is guided to an air cleaner connected to an engine. This is achieved by the intake system of the motorcycle.

[0007]

1 is a side view of an embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a rear view, and FIG. 4 is a side view showing the appearance.

Reference numeral 10 is a body frame, and a steering shaft tube 12
From one main tube 14 and one down tube 16 extending obliquely downward and rearward, and a pair of left and right seat pillar tubes 18 descending from the rear end of the main tube 14.
8 and a pair of left and right lower tubes 22 and 22 which gather from the down tube 16 downward and rearward to the seat pillar tubes 18 and 18 by a pivot bracket 22 and a pair of left and right seat rails 2 which extend rearward from the main tube 14.
4 and a pair of left and right back tubes 26, 26 connecting the pivot bracket 20 and the seat rail 24.

A front wheel 30 is attached to the lower ends of the pair of front forks 28, 28 held by the steering shaft cylinder 12, and a steering handlebar 32 is attached to the upper ends of the front forks 28, 28. .. Reference numerals 34 and 34 denote a pair of left and right rear arms, the front ends of which are pivotally supported by the pivot bracket 20, and the rear wheels 36 are held at the rear ends.

Reference numeral 38 is a cushion unit for elastically supporting the rear wheel 36. The upper end of the cushion unit 38 is pivotally supported on the rear end of the main tube 14, and the lower end thereof is connected to the rear arm 34 via a link mechanism 40.

The link mechanism 40 includes a lower arm 2
A first link 42 whose front end is pivotally supported between the second and the second ends 22 and whose rear end can swing up and down, and the first link 42 and the rear arm 3
4 and a pair of second links 44 that connect the first link 42 and the second link 44 to each other.

Reference numeral 46 denotes a single-cylinder liquid-cooled two-cycle engine, which is mounted between the lower tube 22 and the seat pillar tube 18. The output of the engine 46 is transmitted to the rear wheels 36 via the chain 48.

The engine 46 has a cylinder 50 standing upright and obliquely upward, and a carburetor 52 is connected to the rear surface thereof. A first air cleaner 54 is disposed between the left and right back tubes 26, 26 behind the cushion unit 38. The first air cleaner 54 and the carburetor 52 are connected to the duct 5 that bypasses the left side of the cushion unit 38.
6 are connected. The element is housed in the first air cleaner 54.

Reference numeral 58 is a second air cleaner, which is a rear wheel 36.
Is disposed above the left side of the. That is, the second air cleaner 58 is hung outside the left seat rail 24, and the lower portion thereof is held by the side bar 60 connecting the left back tube 26 and the rear portion of the seat rail 24.

The second air cleaner 58 is formed of a resin-made rear vehicle body cover 62 integrally with an intake box 64 to a duct 65.
Outside air is sucked in through the duct 66, and the sucked air is sucked into the duct 66.
Is guided to the first air cleaner 54. Here, the rear vehicle body cover 62 extends downward from the left and right side edges of a driving seat 102 to cover the second air cleaner 58 and an exhaust muffler 76 described later, and extends rearward from the driving seat 102 continuously to the rear wheel 36. Rear fender portion 62A that covers the upper part of the
It is also accompanied.

A tail lamp 68 that projects substantially horizontally rearward is attached to the rear portion of the rear vehicle body cover 62, that is, the upper surface of the rear fender portion 62A, and an outside air intake 70 is opened below the tail lamp 68. In other words, this outside air intake 70
Has an opening on a surface that does not face the rear wheel 36 of the rear fender portion 62A. For this reason, it becomes difficult to suck in muddy water or the like that the rear wheel 36 winds up from the outside air intake 70. Further, in this embodiment, since the tail lamp 68 extends above the outside air intake 70 like a canopy, it becomes difficult to suck rainwater, snow or the like into the intake box 64.

Further, an air flow path bent by an appropriate number of walls 59 is formed in the second air cleaner 58, and a rubber cap 72 is attached at an appropriate position. The rubber cap 72 can be detached from the front, and by removing the rubber cap 72, the snow accumulated in the air flow passage can be removed during the steering operation in the snow.

An exhaust pipe 74 is connected to the front surface of the cylinder 50. The exhaust pipe 74 extends from the cylinder 50 to the front lower side, makes a half turn in the counterclockwise direction, and then extends upward. Then, it extends rearward through the right side of the cushion unit 38 via an expansion pipe portion located on the upper right side of the cylinder 50, and is connected to the exhaust muffler 76.

The exhaust muffler 76 is disposed above the right side of the rear wheel 36. That is, the muffler 76 is formed in an oval shape having a vertically long cross section, the upper part thereof is attached to the right seat trail 24, and the lower part thereof is on the right back tulle.
Side bar 78 that connects the bush 26 and the seat trail 24.
(See FIG. 3).

The second air cleaner 58 and the muffler 76 are entirely covered laterally by a rear vehicle body cover 62. The tail pipe of the muffler 76 penetrates the rear vehicle body cover 62 and projects rearward. Further, in this embodiment, the rear wheel 36 and the second wheel
A sound insulating plate 80 is provided between the air cleaner 58 and the muffler.
A heat shield plate 82 is attached between the heat shield plate 76 and the heat shield plate 76 (FIG. 3).
Therefore, the intake noise of the second air cleaner 58 is unlikely to leak to the outside, and is also suitable for keeping the muffler 76 warm and sound-insulating. Particularly when the exhaust purification measures such as a catalyst are applied to the muffler 76, the purification action can be promoted by keeping the muffler 76 warm.

Reference numeral 84 denotes a vertically long radiator with an electric fan, which is vertically mounted on the left rear side of the steering shaft tube 12.
The coolant of the engine 46 circulates in the radiator 84. 86 is a fuel tank. The fuel tank 86 is mounted so as to straddle the main tube 14, and a recess 88 for accommodating the radiator 84 is formed on the left lower front surface thereof.

Reference numeral 90 denotes a resin front vehicle body cover which covers the periphery of the steering shaft cylinder 12 from the fuel tank 86 radiator 84 to the vicinity of the cylinder 50. Here, above the steering handlebar 32 is a tank cover 92 that can be opened and closed upward and can be opened for refueling. 94 is a resin side cover.
And covers the side of the engine 46 and the vicinity of the pivot bracket 20 from the front of the cylinder 50.

Reference numeral 96 denotes a removable intermediate cover made of resin, which covers the side of the vaporizer 52. In the intermediate cover 96, an exhaust air outlet 98 for guiding the traveling wind passing through the radiator 84 to the outside is opened rearward. This exhaust port 98
The carburetor 52 can be adjusted from this, and this intermediate cover 96
By removing the carburetor 52, the vicinity of the carburetor 52 can be easily maintained.

Reference numeral 100 is a lower cover formed in a substantially bowl shape so as to cover the lower side of the engine 46. The lower cover 100 is made of a metal such as an aluminum plate having excellent impact resistance, and its front portion covers the front lower portion of the exhaust pipe 74 from below, while its rear portion extends below the link mechanism 40 to form a link mechanism. Four
Protect 0 from obstacles on the road.

The reference numeral 102 designates a straddle type operation seat which is located obliquely rearward of the engine 46 and which is long in the front-rear direction.
Attached to the cable 24. The front portion of the driving seat 102 smoothly continues to the front vehicle body cover 90, and the rear portion and the side edge thereof smoothly continue to the rear vehicle body cover 62. 1
Reference numeral 04 denotes a pair of left and right footrests.

In the above embodiment, the first and second air cleaners 54 and 58 are separately provided, and the second air cleaner 58 is disposed on the side of the rear wheel 36, so that the total volume of the air cleaner is increased. Can be big enough. However, it goes without saying that the present invention may omit one of the first and second air cleaners 54 and 58.
The second air cleaner 58 has a rear fender portion 62A.
Since the air is taken in through the intake box 64 provided in the above, intake noise can be further reduced.

However, in the present invention, the intake box 64 may be omitted and the intake pipe of the air cleaner may be opened directly on the upper surface of the rear fender portion. Further, the rear fender of the present invention may be any one that extends rearward in succession to the driving seat, and in addition to this rear fender, a small mudguard that vertically moves integrally with the rear wheel may be separately provided. The passage for guiding the outside air from the outside air intake to the air cleaner may be formed by a duct or the like, but it is formed by arranging the bottom plate of the operation sheet 102 and the rear fender below it so as to face each other. Good.

[0028]

As described above, according to the present invention, the outside air intake for taking in the intake air of the engine is opened on the upper surface of the rear fender which continuously extends rearward from the operation seat. , It becomes the farthest position from the engine, and it becomes difficult for warm air to enter the engine. Therefore, the output of the engine increases. Further, since muddy water or the like rolled up by the rear wheel does not hit the upper surface which does not face the rear wheel of the rear fender, this muddy water does not easily enter the outside air intake opening on the upper surface.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a plan view of the same.

[Figure 3] Similarly, rear view

FIG. 4 is a side view showing the appearance.

[Explanation of symbols]

 36 Rear Wheel 46 Engine 62 Rear Body Cover 62A Rear Fender 70 Outside Air Intake 102 Operating Seat

Claims (1)

[Claims] 1. An engine mounted near the center of a vehicle body between front and rear wheels, a straddle-type driving seat disposed obliquely above and behind the engine, and a rear wheel extending rearward continuously from the driving seat. In a motorcycle including a rear fender that covers the upper part of the rear fender, an outside air intake port is opened on an upper surface of the rear fender, and the outside air is guided to an air cleaner connected to an engine.