JPH0110319Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air cleaner structure for a two-wheeled vehicle.

Generally, when supplying combustion air to the engine of a motorcycle, etc., external air containing a large amount of dust is not used as is, but it is passed through an air cleaner element to remove dust, etc.
It is then sent to a carburetor, mixed with fuel such as gasoline, and then supplied to the engine.

In a motorcycle, for the purpose of filtering the external air for combustion, an air cleaner case is provided in the flow path of the external air for combustion, for example, below the passenger seat, and an air cleaner element is disposed inside this air cleaner case. There is a structure that looks like this. The air cleaner case having the above structure has an opening for attaching and removing the air cleaner element on the rear or side surface, and this opening is usually covered with a lid. If the air cleaner element needs to be replaced, such as when a large amount of dirt, dust, etc. has adhered to the air cleaner element and the air passage resistance exceeds a certain value, open the lid and insert it from the opening. After inserting a hand into the case and removing the mounting bolt, the air cleaner element itself was grasped directly with the hand and taken out from the case, and then a new air cleaner element was installed inside the case.

However, with the above-mentioned conventional air cleaner structure, when replacing the air cleaner element, the air cleaner element is directly grasped with the hand, which may cause the hands to get dirty. The drawback was that there was a risk that adhered mud, sand, dust, etc. would fall into the case, and extra care had to be taken to prevent this.

The present invention has been developed in view of the above circumstances, and provides an air cleaner structure for motorcycles that does not involve the risk of getting your hands dirty when replacing the air cleaner element, and also eliminates the risk of mud, sand, dust, etc. falling into the air cleaner case. Its main feature is that the rear frame can be rotated vertically around its lower end, and the unitized air cleaner element can be inserted into the air cleaner case of the rear frame as a unit. The main feature is that it can be attached and detached from the front side of the rear frame, where mud and the like are less likely to adhere.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 6. FIG. 1 is an overall view showing the schematic structure of an off-road two-wheeled vehicle equipped with the air cleaner structure of the present invention.

In the figure, reference numeral 1 denotes a vehicle body frame, which is composed of a front frame 2 and a rear frame 3.
The front frame 2 is composed of a head tube 4, a main frame 5, a down tube 6, and an under pipe 7. On the other hand, rear frame 3
is a monolithic model due to its integral construction.
Of the upper and lower fixed parts 8 and 9 projecting forward, the upper fixed part 8 is detachably attached to the rear end of the main frame 5 via bolts 10 and nuts 11 shown in FIG. Lower fixed part 9
is attached to a bracket 12 attached to the underpipe 7 via bolts 13.
When the upper fixed part 8 is released from the main frame 5, the rear frame 3 rotates in the vertical direction around the tip of the lower fixed part 9, as shown in FIG. I'm starting to get it.

There is a bracket 1 on the rear front side of the under pipe 7.
4 is attached to the bracket 14, and a rear fork 15 is attached to this bracket 14 so as to be freely rotatable in the vertical direction. A bracket 16 is attached to the rear rear side of the underpipe 7, and a link mechanism 17 is attached between the bracket 16 and the rear fork 15. Furthermore, link mechanism 1
The lower end of the rear suspension 18 is rotatably attached to the main frame 7, and the upper end of the rear suspension 18 is rotatably attached to the rear end of the main frame 5. The link mechanism 17 and the rear suspension 18 buffer and absorb vertical swinging of the rear fork 15.

As shown in FIG. 5, the rear frame 3 is formed into a generally triangular shape on the side by sheet metal pressing or synthetic resin molding, and an air cleaner case 21 is formed inside the rear frame 3. A rear fender 23 is configured together with a connecting member 22 connected to the rear fender 23. The upper opening 24 of the air cleaner case 21 is hermetically closed by a passenger seat 25 disposed above the upper opening 24, and recesses 26 are formed on both outer sides of the upper side of the air cleaner case 21. It is formed. At the bottom of this recess 26, there are a plurality of (for example, five)
Cylindrical bodies 27 are installed in a horizontal row, and the inside of the air cleaner case 21 communicates with the recess 26 through the through holes 27a of the cylindrical bodies 27.
Furthermore, side covers 28 are attached to both sides of the air cleaner case 21, and a louver portion 29 is formed on the side portions of these side covers 28 at a portion facing the recess 26. Note that 30 is a drain pipe. Further, an air cleaner element unit 32 is detachably attached to the front opening 31 of the air cleaner case 21 from the front side of the air cleaner case 21, as will be described later. Further, a contube 33 is connected to the front of the air cleaner element unit 32, and the contube 33 is connected to a carburetor 34, and the carburetor 34 is further connected to the suction side of an engine 35.

The air cleaner element unit 32 is
It is composed of a base 36, a base 37, a retainer 38, and an air cleaner element 39. As shown in FIG. 3, the base 36 includes a base main body 42 which is approximately disc-shaped, has a semicircular opening 40 formed at the top, and has a nut-shaped body 41 attached to the center.
and a funnel-shaped contube connection part 43 that is attached coaxially to the front side of the base body 42 and tapers toward the front of the vehicle body. As shown in FIG. 4, the base 36 is screwed to the front surface of the air cleaner case 21 with a rubber bushing 45 and a washer 46, with a seal rubber 44 sandwiched therebetween. . At the opposing portion of the seal rubber 44 and rubber bush 45,
Step portions 44a and 45a are provided respectively, and these step portions 44a and 45a fit into the bolt insertion holes of the base body 42, whereby the air cleaner case 21 and the base body 42 are held airtight, and Misalignment of both 21 and 42 is prevented. Note that a nut 48 is fixedly attached to the front back side of the air cleaner case 21 by welding or the like. At the rear of the base 36, a base 37 made of a flexible material such as rubber, a retainer 38, and an air cleaner element 39 are coaxially attached to the base 36 with mounting bolts 49. Note that 50 is a spacer that fits into the center of the air cleaner element 39.

When the engine 35 is in operation, the internal pressure of the air cleaner case 21 connected to the suction side of the cylinder decreases due to the downward movement of the piston, and as a result, as shown in FIG. External air containing mud, sand, dust, etc. flows through the looper part 29 into the space 51 formed between the recess 26 and the side cover 28, and further flows through the through hole 27a of the cylindrical body 27. It flows into the cleaner case 21. At this time, relatively large mud, sand, etc. cannot pass through the through hole 27a, and therefore a certain degree of filtration is performed in this portion. Furthermore, the external air that has flowed into the air cleaner case 21 passes through the air cleaner element 39 and flows into the air cleaner element unit 32, but at this time, mud, sand, dust, etc. are completely removed, and the 40 and flows into the contube 33.

When replacing the air cleaner element 39, disconnect the contube 33 and the air cleaner element unit 32, and
The bolts 10 are removed to release the upper fixed part 8 of the rear frame 3 from the front frame 2, and the rear frame 3 is fixed to the lower fixed part 9 as shown in FIG.
Rotate clockwise around the center. Then, a screwdriver is inserted into the gap created between the front frame 2 and the seat 25, the mounting screws 47 are removed, and the air cleaner element unit 32 is taken out upward as a whole. Next, with the air cleaner element unit 32 taken out to the outside, remove the mounting bolts 49 and replace the air cleaner element 39, and then perform the above steps in reverse to replace the air cleaner element unit 3.
Attach 2 to the vehicle body.

During such replacement work, the rotation of the rear frame 3 causes the contube connection portion 43 of the air cleaner element unit 32 to protrude upward between the front frame 2 and the rear frame 3. . Therefore, the air cleaner element unit 32 can be attached or detached by grasping the contube connecting portion 43.
Therefore, there is no need to directly touch the air cleaner element 39, so there is no risk of getting your hands dirty. In addition, since the air cleaner element 39 is taken out of the case 21 in a unitized state, the air cleaner element 39 is not touched by hands inside the case 21, and therefore, it does not stick to the air cleaner element 39. There is no risk that mud, sand, dust, etc., falling into the case 21. Moreover, the part where the air cleaner element unit 32 is attached and detached is located at the front part of the rear frame 3, and the rear frame 3, the contube 33, the carburetor 34, the rear suspension 18, which are disposed in front of the rear frame 3, Alternatively, since it is surrounded by the engine 35 and the like, mud, sand, dust, etc. are prevented from adhering to this attachment/detachment part, and the above-mentioned action and dust also prevent these from entering the air cleaner case 21. More effective prevention.
Furthermore, since the element 39 is replaced outside the case 21, the element 39 can be replaced easily and quickly.

In addition, in the above embodiment, the air cleaner unit 32 is fixed to the air cleaner case 21 with flexible materials 44 and 45 interposed between the two, resulting in good sealing performance and , deformation or vibration of the rear frame 3 is not transmitted to the air cleaner element unit 32 while the vehicle is running.

As explained above, according to the air cleaner structure for a two-wheeled vehicle according to the present invention, when the rear frame, in which the air cleaner case is integrally molded, is attached to the front frame when the upper fixed part is unfixed, The air cleaner element unit is rotatable, and the air cleaner element unit is detachably attached to the inside of the air cleaner case from the front side of the air cleaner case.
The mounting position of the air cleaner element unit is located in a position surrounded by the rear frame and the component parts of the motorcycle such as the engine disposed in front of the rear frame, thereby suppressing the adhesion of mud, etc. to the mounting position. In addition, when the air cleaner element unit is attached or detached, the contube connection part of the air cleaner element unit is made to protrude into the separated part between the rear frame and the front frame, so that the contube connection part can be used as a grip part for attachment and detachment. It is easy to operate, there is no risk of mud, sand, dust, etc. falling into the air cleaner case, and the air cleaner element can be replaced easily and quickly.

[Brief explanation of the drawing]

Figures 1 to 5 show an off-road motorcycle equipped with the air cleaner structure of the present invention.
Fig. 1 is an overall view showing the general structure, Fig. 2 is a partially cutaway side view showing the main parts, Fig. 3 is a cross-sectional plan view, Fig. 4 is an enlarged view of the circular part in Fig. 3, FIG. 5 is an exploded view of a part of the air cleaner system, and FIG. 6 is a diagram showing the operation of the present invention. 1...Vehicle frame, 2...Front frame, 3
... Rear frame, 8, 9 ... Fixed part, 17 ...
...Link mechanism, 18...Rear suspension, 2
DESCRIPTION OF SYMBOLS 1... Air cleaner case, 32... Air cleaner element unit, 33... Contube, 34... Carburetor, 35... Engine, 3
6...Base, 37...Base, 38...Retainer, 39...Air cleaner element.

Claims (1)

[Scope of utility model registration request] The vehicle body frame is composed of a front frame on which an engine is mounted and a rear frame attached to the rear end of the front frame, an air cleaner case is provided on the rear frame, and a lower end of the rear frame is attached to the rear frame. The air cleaner case is rotatably attached to the front frame, and the upper end is detachably attached to the front frame, an opening is formed in the front of the air cleaner case, and a base is detachably attached to cover this opening. An air cleaner structure for a two-wheeled vehicle, characterized in that an element is attached to the inside of a base and a funnel-shaped connection part that communicates with a contube is provided on the outside.