JP2563905B2 - Motorcycle air intake system - Google Patents

Description

Description: [Industrial field of use] The present invention relates to an intake device for a motorcycle in which an internal space of a frame is an air cleaner.

[Prior art]

BACKGROUND ART Conventionally, there is known a motorcycle in which a frame member located above an engine is formed in a hollow box shape using a pressed steel plate and an internal space of the frame member is used as an air cleaner of the engine. In this type of motorcycle, an air intake is opened in the wall surface of the frame member, and the air sucked from the intake is guided to the internal space. The suction port of the carburetor is opened in this internal space, and an air cleaner element for purifying the air sucked from the intake port is housed therein. The air cleaner element has a hollow cylindrical shape, and is arranged in such a posture as to surround the suction port of the carburetor in the internal space.

[Problems to be Solved by the Invention]

However, according to this conventional configuration, since the air cleaner element surrounds the suction port of the carburetor, the air sucked into the internal space flows from the outside to the inside of the air cleaner element. The space for storing the purified air is limited to a very narrow area inside the air cleaner element.

Therefore, if the throttle is opened abruptly and largely, the amount of air taken into the carburetor will be insufficient, and there will be a problem that the engine will breathe.

The present invention has been made based on such a situation, and it is possible to smoothly operate the engine without supplying an insufficient amount of air to be supplied to the engine and to support the air cleaner element at both ends with respect to the frame member. It is an object of the present invention to provide an intake device for a motorcycle, which can be firmly held by the air cleaner element, which can increase the size of the air cleaner element and which can suppress the intake resistance.

[Means for solving problems]

In order to achieve the above object, the present invention forms a frame member located above an engine into a hollow box shape, accommodates an air cleaner element in the internal space of the frame member, and uses this internal space for the intake air of the engine. It is premised on an intake device for a motorcycle used as an air cleaner connected to a passage.

The frame member has an opening on the front upper surface thereof that is continuous with the internal space, and the bottom surface of the frame member facing the opening is projected downward so that the inside of the projection is While disposing a bracket for receiving an air cleaner element, the air cleaner element is a hollow cylindrical filter member that is inserted into the internal space through the opening, and the filter member is attached to the upper surface of the filter member and is provided in the space inside the filter member. The air cleaner element has a lid plate having a continuous communication port and a bottom plate that covers the bottom surface of the filtering member, and the air cleaner element detachably fits an outer peripheral portion of the lid plate to a peripheral portion of the opening. By removably fitting the bottom plate to the upper surface of the bracket, both ends are supported by the frame member, and A lid having an air intake is detachably fitted to a lid plate of an air cleaner element that covers the opening of the comb member, and the lid penetrates the communication port of the lid plate and the passage of the filtering member. It is fixed to the frame member together with the air cleaner element via a screw screwed into the bracket.

[Action]

According to this configuration, since the air cleaner element is continuous with the opening of the frame member, the air sucked from the air intake port of the lid body flows into the passage inside the filter member, from which the diameter of the filter member is reduced. And is guided to the outside of this filtering member. Therefore, most of the internal space of the frame member can be utilized as a space for storing the air purified by the filtering member, and a sufficient volume for storing the purified air can be secured.

Further, the air cleaner element is supported by the frame member by fitting the lid plate to the opening peripheral edge of the frame member and fitting the bottom plate to the bracket arranged in the internal space. It will be supported at both ends along the axial direction. for that reason,
The air cleaner element can be firmly supported without rattling, and the posture in the internal space is stable.

Example of Invention

The present invention will be described below based on an embodiment shown in the drawings.

In FIG. 3, reference numeral 1 is a frame, and a steering head pipe 3 pivotally supporting the front fork 2 is connected with a main member 4 as a frame member. The main member 4 extends rearward, and an engine 5 is arranged below the main member 4. The engine 5 of the present embodiment is a V-shaped engine in which a front cylinder 7 and a rear cylinder 8 are erected on a crankcase 6 in a substantially V shape in a side view, and these front cylinder 7 and rear cylinder 8 are combined. In between, downdraft-type vaporizers 9 and 9 are arranged.

By the way, the main member 4 is formed by pressing and welding half-divided bodies 10a, 10b made of a press steel plate whose side surfaces are opened from the left-right direction, and is formed in a hollow box shape elongated in the front-back direction. The bottom surface 11 of the main member 4 has a carburetor 9,9.
Joints 12, 12 connected to the intake upstream end of the joint 12 are penetratingly provided, and an intake passage 13 in the joints 12, 12 is opened in an internal space 14 of the main member 4.

A circular opening 15 that opens to the internal space 14 is provided on the upper surface of the front portion of the main member 4. A support ring 16 is welded to the inner peripheral edge of the opening portion 15.
An air cleaner element 17 (hereinafter referred to as an element) is inserted inside the 16. The element 17 has a hollow cylindrical filter paper 18 as a filtering member. A bottom plate 20 is adhered to the bottom surface of the filter paper 18. The bottom plate 20 is
A space 19 inside the filter paper 18 is closed, and a positioning projection 26 is integrally provided at the center of the bottom surface of the bottom plate 20. An upper surface holding frame 22 as a cover plate is adhered to the upper surface of the filter paper 18. The upper surface holding frame 22 has a communication port 21 in the center, and the communication port 21 is continuous with the space 19 inside the filter paper 18. The outer peripheral portion of the upper surface holding frame 22 is detachably fitted to the opening edge portion of the support ring 15.

As shown in FIG. 1, the bottom surface 11 of the main member 4 is
Immediately after the head pipe 3, there is a protruding portion 11a protruding downward. The protruding portion 11a has the opening 15
And is located in front of the vaporizers 9, 9. Therefore, the vertical dimension of the internal space 14 is locally increased at the mounting portion of the element 17.

A bracket 23 that receives the bottom plate 20 of the element 17 is arranged in the internal space 14 of the main member 4. The bracket 23 is positioned inside the protruding portion 11a, and the upper surface of the bracket 23 is positioned at substantially the same height as the bottom surface 11 of the main member 4 which is continuous with the rear end of the protruding portion 11a. The bracket 23 is welded to the two collars 24, 24 extending over the left and right sections of the main member 4, and the tray 25 welded to the upper surface of the bracket 23 is attached to the above-mentioned element.
17 positioning protrusions 26 are fitted. Therefore, the element 17 enters the internal space 14 in front of the joints 12, 12, and the entire internal space 14 constitutes the air cleaner 27.

The inside of the collar 24 is a bracket for engine suspension.
It is for holding the bolt connecting 28 to the main member 4 in communication, and also functions as a cross member of the main member 4.

On the other hand, a plate-shaped lid 30 is coaxially stacked on the upper surface holding frame 22 of the element 17 from above. Lid
The inside of 30 is connected to the communication port 21 of the element 17, and an air intake port 31 extending rearward is provided on the rear surface of the lid 30.
Are integrally formed. A screw 32 is inserted from above in the central portion of the upper surface of the lid body 30.
The insertion end of passes through the inside of the filter paper 18 and
After penetrating through a through hole 38 provided in 26, it is screwed into a nut 34 welded to the bracket 23. Therefore, the screw 32
The element 17 is tightened and fixed between the lid 30 and the bracket 23 when the
It is integrally clamped and fixed on the upper support frame 22 of 17.

In the case of this embodiment, the through hole 33 through which the screw 32 penetrates
The inner surface of the has a tapered surface 35 that expands outward in the radial direction as it goes upward, so that the insertion tip of the screw 32 is guided by the tapered surface 35 and guided to the nut 34. .

The main member 4 is covered with a tank cover 36 that forms a fuel tank, and the tank cover 36 covers the lid 30 and the air intake 31 from the outside.

In such a structure, during engine operation, the air sucked from the air intake port 31 passes through the communication port 21 from the inside of the lid body 30 to the inside of the space 19 inside the filter paper 18 as shown by the arrow in FIG. Flow into. This air passes through the filter paper 19 from the inside toward the outside, and the air is purified in the process. Then, this purified air is guided from the outer peripheral surface of the element 17 to the internal space 14, and is sucked into the carburetors 9, 9 through the joints 12, 12 from here.

According to such an embodiment of the present invention, since the element 17 is attached to the opening 15 of the main member 4 continuously to the air intake port 31, the air from the intake port 31 causes the element 17 to come from the inside. It passes toward the outside and is guided to the internal space 14. That is, the element 17 is the main member 4
Since the internal space 14 is located at the upstream end of the flow path of the air sucked from the intake port 31, most of the internal space 14 can be utilized as a space for storing the air purified by the element 17. Therefore, a sufficient volume for storing purified air can be ensured, and even if the throttle is suddenly opened greatly, the amount of air taken into the carburetors 9, 9 does not become insufficient.

Therefore, during operation, the engine 5 does not breathe, and the engine rotation connection is smooth.

Further, the element 17 fits the outer peripheral portion of the upper surface holding frame 22 to the support ring 16 connected to the opening 15, and
Position the positioning protrusion 26 of the bottom plate 20 on the pan on the top of the bracket 23.
Since it is supported by the main member 4 by being fitted to 25, both ends of the main member 4 are supported. Therefore, the element 17 can be firmly supported without rattling, and the posture in the internal space 14 is stabilized.

Moreover, since the bottom surface 11 of the main member 4 has the protruding portion 11a protruding downward at the portion facing the opening portion 15, the vertical dimension of the internal space 4 becomes longer in the portion that accommodates the element 17, and 17 bottom plates
The bracket 23 for receiving 20 can be arranged far below the opening 15. Therefore, although the bottom plate 20 of the element 17 is supported, the axial dimension of the element 17 can be sufficiently secured, and the element 17 can be upsized accordingly, and the intake resistance can be reduced. You can

Further, in the case of the above configuration, since the element 17 and the lid body 30 are overlapped and both of them are fastened together to the main member 4 with the single screw 32, the mounting structure of the element 17 and the lid body 30 is common. Therefore, the number of parts can be reduced and the cost can be reduced.

〔The invention's effect〕

According to the present invention described in detail above, most of the internal space of the frame member can be utilized as a space for storing the air purified by the air cleaner element, and a sufficient volume for storing the purified air can be secured. Therefore, even if the throttle is wide open while the engine is operating,
The amount of air taken into the intake passage does not become insufficient, and the engine rotates smoothly.

Further, since the air cleaner element is supported by the frame member at both ends along the axial direction thereof, the air cleaner element can be firmly supported without rattling, and the posture in the internal space is stabilized.

Moreover, since the bottom surface of the frame member is projected downward at the portion facing the opening, the vertical dimension of the internal space becomes longer at the portion that accommodates the air cleaner element, and the bracket that supports the bottom plate of this air cleaner element is formed. It can be placed below the opening and away from it. Therefore, although the bottom plate of the air cleaner element is supported, the axial dimension of the air cleaner element can be sufficiently secured, and the air cleaner element can be increased in size accordingly.
Intake resistance can be kept small.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a sectional view of an intake system, Fig. 2 is a partially sectional plan view, and Fig. 3 is a side view of a motorcycle. 4 ... Frame member (main member), 5 ... Engine, 11 ... Bottom, 11a ... Projection, 13 ... Intake passage, 14
…… Internal space, 15 …… Aperture, 17 …… Element, 18…
… Filtering material (filter paper), 19 …… space, 20 …… bottom plate, 21 ……
Communication port, 22 ... lid plate (upper surface holding frame), 23 ... bracket, 27 ... air cleaner, 30 ... lid, 31 ... air intake port, 32 ... screw.

Claims (1)

(57) [Claims] 1. A frame member located above an engine is formed in a hollow box shape, and an air cleaner element is housed in an internal space of the frame member, and the internal space is used as an air cleaner connected to an intake passage of the engine. In the motorcycle air intake device described above, the frame member has an opening communicating with the internal space on the front upper surface thereof, and the bottom surface of the frame member facing the opening is projected downward to thereby A bracket for receiving the air cleaner element is arranged inside the protruding portion, and the air cleaner element is attached to an upper surface of the hollow cylindrical filtration member inserted into the internal space through the opening, and the filtration member. A lid plate having a communication port that communicates with the space inside the member, and the bottom of the filtering member The air cleaner element has an outer peripheral portion of the lid plate removably fitted to a peripheral portion of the opening, and the bottom plate is removably fitted to an upper surface of the bracket. Then, a lid having an air intake port is detachably fitted to a lid plate of an air cleaner element that is supported at both ends by the frame member and covers the opening of the frame member. An intake device for a motorcycle, wherein the intake device for a motorcycle is fixed together with the air cleaner element to the frame member via a screw threaded through the communication port of the plate and the passage of the filtering member and screwed into the bracket.