JP2676361B2 - Motorcycle air cleaner device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an air cleaner device for a motorcycle in which an air cleaner is provided in a recess formed in a rear upper surface of a fuel tank.

(Prior Art) When a motorcycle is particularly for a rally, there is a large amount of dust that has been vigorously bounced off the road surface around the lower part of the motorcycle.

Therefore, the air cleaner for filtering the outside air and sucking it into the engine is generally provided at the highest position above the engine above the engine in order to suck cleaner air into the engine.

In the above case, since a fuel tank is usually provided above the engine, it has been proposed to form a recess in the rear upper surface of this fuel tank and use this recess to provide an air cleaner. (For example, JP-A-61-150827).

(Problems to be Solved by the Invention) By the way, in order to improve the performance of the engine, it is preferable to make the capacity of the air cleaner as large as possible. However, the capacity of the fuel tank is reduced, which is not preferable.

Therefore, the inventor has focused on the following points. That is, the upper surface of the rear part of the fuel tank has a shape that descends rearward, but this is mainly made from a design point of view, and the upper space near the upper surface of the rear part is provided behind the fuel tank. There is not much need for a rider seated on a given seat. In particular, the above-described upper space is a surplus space that is rarely used in a rally motorcycle.

(Object of the Invention) The present invention has been made by paying attention to the above circumstances, and does not reduce the capacity of the fuel tank and prevents the outer shape of the motorcycle from becoming unnecessarily large, and the capacity of the air cleaner. The purpose is to be able to secure enough.

Another object of the present invention is to facilitate maintenance and inspection work for the air cleaner.

(Structure of the Invention) In order to achieve the above object, a feature of the present invention is that a fuel tank is provided so as to be connected to a front end of a seat above an engine, and a rear upper surface of the fuel tank is formed in a rearward descending shape. An approximately U-shaped recess is formed on the upper surface of the rear portion of the fuel tank so as to open rearward in a plan view, and an air cleaner for filtering the outside air taken in by the engine is inserted into the recess so that the air cleaner can be inserted and removed. In the air cleaner device for a motorcycle, the cleaner element has a cylindrical shape with a substantially vertical axis, and a cleaner case cover that covers the cleaner element from above and closes the upper opening of the recess. The upper part of the fuel tank is projected above the rear upper surface of the fuel tank, and the cleaner case cover is mounted above the rear part of the fuel tank. Protrude above the lies the cleaner case cover the point in which it is fixed detachably to the fuel tank.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 2, 1 is a motorcycle, 2 is a body frame thereof, and the body frame 2 has a semi-double cradle shape. That is, the vehicle body frame 2 has a head pipe 3 at a front portion thereof, a main frame 4 extends from the upper part of the head pipe 3 toward a rear lower part, and a pair of right and left seats is provided from a rear end of the main frame 4. A pillar tube 6 extends downward.

On the other hand, a down tube 7 is provided which extends rearward and downward from a lower portion of the head pipe 3 and has a rear end connected to a lower end of the seat pillar tube 6. The down tube 7 includes a front tube 8 extending downward from a lower portion of the head pipe 3, and a pair of right and left rear tubes that extend downward from the lower end of the front tube 8 and then bend backward. It is composed of 9,9.

A front fork 11 is supported on the head pipe 3 so as to be steerable. That is, the front fork 11 has a steering shaft inserted into the head pipe 3, and the steering shaft is rotatable around the axis of the head pipe 3. An upper bracket is attached to the upper end of the head pipe 3.
12 is attached, and a lower bracket 13 is attached to a lower end. A pair of left and right fork pipes 14, 14 are supported by the upper bracket 12 and the lower bracket 13, and a front wheel 15 is supported between the lower ends of the both fork pipes 14, 14, while the handle 16 is placed on the up bracket 12.
Is supported.

A rear arm 19 is pivotally supported at the lower part of the seat pillar tubes 6, 6 by a pivot shaft 18 so as to be vertically swingable. A rear wheel 20 is supported on the swing end of the rear arm 19. Further, the shock absorber 2 is interposed between the upper portions of the seat pillar tubes 6, 6 and the rear arm 19 via a link mechanism 22.
The shock absorber 21 absorbs an impact transmitted from the road surface 23 to the vehicle body frame 2 through the rear wheel 20 and the rear arm 19.

At this time, the link mechanism 22 operates as follows.
That is, when the rear wheel 20 receives an impact from the road surface 23 and the rear arm 19 rotates upward while the motorcycle 1 is traveling, the link mechanism 22 operates as a shock absorber 21 as the rear arm 19 rotates upward.
The non-linear increase in the reduction amount of the damper of the rear wheel 20 increases the followability of the rear wheel 20 to the road surface 23.

25 is a 1-cylinder 4-cycle engine.
Is located inside the body frame 2
Has been concluded. A two-port type carburetor 26 is attached to the intake hole of the engine 25, and an air cleaner 27 for cleaning the outside air drawn into the carburetor 26 is provided.

An exhaust pipe 29 is connected to an exhaust hole of the engine 25, and a muffler 33 is attached to a rear end thereof.

1 to 4, a fuel tank 35 for supplying fuel to the carburetor 26 is provided. This fuel tank 35
Has a pair of front tanks 36, 36 provided above the engine 25 so as to sandwich the main frame 4 from the left and right. The two front tanks 36, 36 are screwed to each other by bolts 36a, and the seat pillar tubes 6 are bolted to each other.
It is screwed by b and supported by the main frame 4. In this case, a cushioning member 36c such as rubber is interposed between the main frame 4 and the fuel tank 35. 36d is a fuel inlet.

Further, the fuel tank 35 has a rear tank 38 behind the vehicle body frame 2, and the rear tank 38 is screwed to a pair of upper and lower stays 6a, 6a projecting from the seat pillar tube 6. The rear tank 38 has an inverted U shape in a front view.

The engine 25 is provided with a drive sheave 41, while the rear wheel 20 is provided with a driven sheave 42, and a transmission chain 43 is wound around the both sheaves 41,42. The engine 25 operates by sucking outside air through the air cleaner 27 and the carburetor 26 and by sucking fuel from the fuel tank 35 through the carburetor 26. If the power of the engine 25 is transmitted to the rear wheels 20 via the transmission chain 43 and the like,
The running of the motorcycle 1 becomes possible.

The rear tank 38 supports a seat 44 on its upper surface. That is, the rear tank 38 is also a support bracket for the seat 44. The front tanks 36, 36 are connected to the front end of the seat 44.

In addition, 45 is a cowling, 46 is a radiator, and 47 is an oil inlet.

Hereinafter, the air cleaner 27 will be described in more detail.

The upper surfaces of the rear parts of the left and right front tanks 36, 36 are formed in a rearward descending shape. Further, a substantially U-shaped recess 48 that is open rearward in a plan view is formed between the rear portions of both the front tanks 36, 36.

The main frame 4 is located on the lower surface side of the recess 48, and the rear end of the bottom of the recess 48 is closed by the front end surface of the seat 44. A chamber 49 made of sheet metal is fitted into the bottom of the recess 48, and the chamber 49 is screwed to the main frame 4 with a bolt 50.

The upper surface of the chamber 49 is almost horizontal, and the inlet hole is on this surface.
52 are formed. A pair of left and right outlet holes 53, 53 are formed on the lower surface of the rear portion of the chamber 49. The connection pipe 54 welded to each outlet hole 53 and each port portion 26 of the vaporizer 26
Each of a and a is connected by a connecting tube 55.

A cleaner element 57 is provided in the recess 48 on the upper surface side of the chamber 49. The cleaner element 57 is inserted in the recess 48 so as to be freely inserted and removed, and has a cylindrical shape with its axis center substantially vertical.

More specifically, the cleaner element 57 has an oval outer cylinder 58 that is long in the front and rear direction in plan view, and the lower end of the outer cylinder 58 is placed on the chamber 49 so as to surround the inlet hole 52. . An inner cylinder 59 is fitted in the outer cylinder 58. Like the outer cylinder 58, the inner cylinder 59 also has an oval shape in plan view.

The upper surfaces of the outer cylinder 58 and the inner cylinder 59 have substantially the same height, and the upper opening of the gap 60 formed between them is closed by the upper lid 61. The upper part of the cleaner element 57 is
The upper part of the outer cylinder 58 and the inner cylinder 59, and the upper lid 61, the upper part of the cleaner element 57 is projected above the respective rear upper surfaces of the left and right front tanks 36, 36. As a result, the filtration area of the cleaner element 57 is increased.

The lower end of the inner cylinder 59 is located slightly higher than the upper surface of the chamber 49, and the lower end opening of the inner hole of the inner cylinder 59 is closed by a lower lid 62.

A pair of front and rear hooks 64 are provided on the left and right outer side walls of the chamber 49, and the pair of rubber hands 65, 65 hung over the left and right hooks 64, 64 is provided on the cleaner element 5 side.
The upper surface of 7 is pressed down, so that the cleaner element 57 is elastically fixed to the upper surface of the chamber 49.

Further, a resin-made cleaner case cover 66 that covers the cleaner element 47 from above and closes the upper surface side opening of the recess 48 is provided.

A plurality of through holes 67, which are long in the front and rear, are formed on the upper surface of the cleaner case cover 66, and these are through holes for the outside air. A rubber shock absorber 68 is interposed between the upper surface of the cleaner element 57 and the ceiling surface of the cleaner case cover 66, and the shock absorber 68 is attached to the cleaner case cover 66.
Attached to.

The middle portion of the cleaner case cover 66 in the vehicle width direction and the front-rear direction is bulged upward, and the middle portion of the cleaner case cover 66 is located on the left and right front tanks 36.
It is projected above the rear upper surface of the 36. Therefore, the inner wall surface of the recess 48 and the cleaner case cover 66
The space surrounded by and is expanded upward, and when the upper portion of the cleaner element 57 is projected upward as described above, the projection height is increased accordingly. That is, this increases the filtering area of the cleaner element 57 and the capacity of the air cleaner 27.

In the above case, the dimension of the cleaner case cover 66 in the vehicle width direction is slightly larger than the upper surface side opening of the recess 48 and smaller than the width dimension of the left and right front tanks 36, 36 on the rear upper surface side. Has been done. Therefore, in the vehicle width direction, it is prevented that the side edge of the cleaner case cover 66 protrudes outward from the rear upper surface of the front tank 36, 36, and in this state, as described above, Air cleaner 27
The capacity of has been increased.

The cleaner case cover 66 is detachably fixed to the front tanks 36, 36 of the fuel tank 35.

Explaining this concretely, the left and right front tanks 3
Hooks 69 are attached to the upper surfaces of the 6, 36, respectively, and a rubber band 70 hung over the hooks 69, 69 presses the upper surface of the cleaner case cover 66. As a result, the cleaner case cover 66 is attached to the front tanks 36, 3
It is fixed to the upper surface of 6 by elastic force.

In the above case, the buffer 68 is elastically pressed against the upper surface of the cleaner element 57, and the cleaner element 57 is fixed more firmly on the chamber 49 and the front tanks 36, 36. Also, the fact that the cleaner case cover 66 moves to the left and right means that this cleaner case cover
It is regulated by the lower edge of 66 contacting the left and right hooks 69.

A locking piece 72 is provided at the lower rear end of the cleaner case cover 66.
Is projecting toward the front, while a locking ring 73 into which the locking piece 72 is removably fitted is welded to the rear end of the upper surface of the chamber 49. With the locking piece 72 fitted in the locking ring 73, the forward movement and upward movement of the cleaner case cover 66 are restricted thereby.

Further, the sheet 44 is a resin-made elastic bottom plate 74,
The seat cushion 75 is mounted on the bottom plate 74, and the front end face of the seat 44 is elastically pressed against or close to the lower end of the rear face of the cleaner case cover 66. Therefore, the front end of the seat 44 prevents the cleaner case cover 66 from moving backward.

On the other hand, in order to remove the cleaner case cover 66, first remove the rubber band 70 from the hook 69,
Next, the front end of the seat 44 is elastically bent rearward, and the cleaner case cover 66 is moved rearward to move the locking piece 72.
Is pulled out from the locking ring 73. As a result, the cleaner case cover 66 can be removed. Also, the cleaner element
When removing 57 for maintenance or the like, each rubber band 65 may be removed from the hook 64.

As shown in FIGS. 1 and 3, the cleaner element 57 and the cleaner case cover 66 are connected to each other by the front tanks 36, 3
When the engine 25 is operated in a state of being fixed to 6 or the like, outside air is sucked into the cleaner case cover 66 through the through hole 67 as shown by an arrow in FIG. 1 and FIG. The outside air is filtered when passing through the outer cylinder 58 and the inner cylinder 59. Then, the cleaned outside air flows into the chamber 49 from the inlet hole 52 through the gap 60, and further, the outlet hole.
It is sent to the vaporizer 26 through 53 and the connecting tube 55.

In this embodiment, the position of the fuel tank 35 is lowered in order to lower the center of gravity of the vehicle body. In this case, since the cleaner element 57 of the air cleaner 27 is provided in the recess 48 by utilizing the recess 48 that penetrates vertically, even if the front tanks 36, 36 are lowered, this front tank 36 The 36, 36 and the cleaner element 47 of the air cleaner 27 do not interfere with each other. Therefore, even when the front tanks 36, 36 are to be lowered further, the air cleaner 27 can secure a predetermined capacity without changing the size and shape of each component such as the cleaner element 57.

(Effect of the Invention) According to the present invention, the fuel tank is provided so as to be connected to the front end of the seat above the engine, and the rear upper surface of the fuel tank is formed in a rearward-down shape, and the rear upper surface of the fuel tank is flat. An air cleaner that forms a substantially U-shaped recess that is opened rearward as viewed and filters the outside air taken in by the engine is inserted into the recess so that the air cleaner can be inserted and removed into a cylindrical shape with a substantially vertical axis. In an air cleaner device for a motorcycle, which comprises a cleaner element and a cleaner case cover that covers the cleaner element from above and closes the upper surface side opening of the recess, an upper portion of the cleaner element is positioned above a rear upper surface of the fuel tank. While projecting upward, the cleaner case cover is projected above the rear upper surface of the fuel tank. It is fixed detachably to the fuel tank Sukaba.

Therefore, since the upper portion of the cleaner element and the cleaner case cover are made to project toward the surplus space above the rear upper surface of the fuel tank which is in a rearward-down shape, the capacity of the fuel tank is narrowed. Therefore, the filtration area and capacity of the air cleaner can be increased.

Since increasing the filtering area and the like of the air cleaner is obtained by utilizing the surplus space on the rear upper surface of the fuel tank which is in the downward descending shape as described above, the cleaner element and the like are added as described above. Despite the protrusion, it is possible to prevent the outer shape of the motorcycle from becoming unnecessarily large.

Further, when the cleaner case cover is removed from the fuel tank, the upper portion of the cleaner element projects from the upper surface of the rear portion of the fuel tank, so that it is possible to easily inspect the degree of contamination of the fuel tank. Further, as described above, since the rear upper surface of the fuel tank has a rearward descending shape, the upper rear surface of the cleaner element is
There is an advantage that it is exposed to the outside to a larger extent, so that the inspection can be easily performed especially from the rear side.

Moreover, when the upper part of the cleaner element is gripped in an attempt to remove the cleaner element at the time of maintenance or inspection of the cleaner element, the upper part of the cleaner element protrudes from the upper surface of the rear part of the fuel tank. This gripping can be done easily, that is, maintenance and inspection of the cleaner element can be done easily.

[Brief description of the drawings]

1 shows an embodiment of the present invention, FIG. 1 is a partially enlarged sectional view of FIG. 2, FIG. 2 is an overall side view of a motorcycle, and FIG. 3 is a sectional view taken along the line III-III of FIG. , FIG. 4 is a plan view. 1 ... Motorcycle, 2 ... Body frame, 25 ... Engine, 27 ... Air cleaner, 35 ... Fuel tank, 44 ... Seat, 48 ... Recess, 57 ... Cleaner element, 66 ...
Cleaner case cover.

Claims (1)

(57) [Claims] 1. A fuel tank is provided so as to be continuous with a front end of a seat above an engine, and a rear upper surface of the fuel tank is formed in a rearward-down shape, and the rear upper surface of the fuel tank is directed rearward in a plan view. An air cleaner that forms a substantially U-shaped recess that is opened to filter the outside air taken in by the engine, a cleaner element that is inserted into and removed from the recess and has a substantially vertical axis, and has a cylindrical shape. An air cleaner device for a motorcycle, comprising: a cleaner case cover that covers the element from above and closes an opening on the upper surface side of the recess, wherein an upper portion of the cleaner element is projected above a rear upper surface of the fuel tank, and The cleaner case cover is projected above the rear upper surface of the fuel tank, and the cleaner case cover is attached to the fuel tank. Air cleaner device for motorcycles that is detachably fixed to the tank.