JPH0228080A - Intake device for motorcycle - Google Patents

Abstract

PURPOSE:To improve charging efficiency of intake air by arranging an air cleaner in the upper of an engine while an intake system part, for introducing a new charge of air to the air cleaner, in the inside of a cowling in the front part of a car body. CONSTITUTION:In a motorcycle, an engine 20 is set up in the rear bottom part of a head pipe 2 in the front end of a frame 1. A cowling 30 is provided to be arranged from the head pipe 2 over to a front fork 9 pivotally mounted turnably to this head pipe 2. Here the engine 20 arranges in its upper an air cleaner 24, while its periphery is coated with a cover 25 continued to a seat 26 in the rear. While an intake chamber 38 or the like, connecting an opening part 33 for fetching cooling air in the cowling 30 to the air cleaner 24, is arranged in the inside of the cowling 30. Further the intake chamber 38 is extended in a longitudinal direction out of the turning range of the front fork 9.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of an intake device that guides fresh air to an air cleaner in a motorcycle in which the front of the head pipe and both left and right sides of the front fork are covered with a cowling. .

[Prior Art] Air cleaners for motorcycles are usually located near the engine and deep inside the vehicle body, so if the ventilation around the air cleaner deteriorates, the temperature of the intake air will increase. This adversely affects the filling efficiency of intake air. Particularly in motorcycles with a cowling attached to the front end of the frame, the presence of the cowling tends to trap hot air from the engine around the air cleaner, which tends to raise the temperature of the air sucked into the air cleaner.

In order to eliminate such problems, conventionally, an intake duct was provided to introduce fresh air into the air cleaner, and the inlet end of this intake duct was opened immediately after the head vibration located at the front end of the frame, so that it could be easily accessed from the front while driving. Motorcycles that actively guide cold, fresh driving wind around an air cleaner are known.

[Problems to be Solved by the Invention] However, in this configuration, the inlet end of the intake duct is close to the circumferential surface of the head pipe, so the running air flows through the narrow space between the head vibe and the inlet end of the intake duct. The wind flows into the intake duct through the space, and the resistance to the inflow of the wind becomes extremely large.

As a result, the amount of air guided around the air cleaner is substantially reduced, making it impossible to sufficiently lower the temperature of the air sucked into the air cleaner.

The present invention was made based on these circumstances, and
It is possible to efficiently guide cool fresh air to the air cleaner, increasing the filling efficiency of intake air.Moreover, the overall length of the intake system parts can be kept short, allowing it to be compactly stored inside the cowling. To provide an intake device for a motorcycle, which does not require holes to pass intake system parts through, has a simple structure, and has a good appearance.

[Means for Solving the Problems] Therefore, in the present invention, the engine is disposed at the rear lower part of the head pipe located at the front end of the frame, and the front fork is pivotally connected to the head vibe. Assuming that the motorcycle has a cowling covering both left and right sides of the upper part of the front fork to the front of the helmet vibrator, an air cleaner is placed above the engine, and the area around this air cleaner is covered with exterior parts that connect to the rear seat. Inside the above cowling,
An intake system component is arranged to connect the cooling air intake opening provided in this cowling with the air cleaner and guide fresh air to the air cleaner, and this intake system component is placed outside the rotation range of the front fork. It is characterized in that it extends substantially horizontally in the front-rear direction through the frame q, and that its intake downstream end is guided to the air cleaner through the space between the frames q.

[Function] According to this configuration, the air cleaner is connected to the cooling air intake opening of the cowling via the intake system parts, so that while driving, fresh cold running air from the front that flows into this opening, that is, The fresh air is directly guided to the intake ports of the intake system components. Therefore, a sufficient amount of fresh air efficiently flows into the intake system components, and the temperature of the air taken into the engine can be kept low.

In addition, since the intake system parts extend back and forth along the inside of the cowling, the shortest distance connects the cowling opening and the air cleaner, which shortens the flow path of fresh air. can do. Furthermore, since the intake system parts do not need to protrude significantly above the front fork, they can be housed compactly inside the cowling, ensuring good forward visibility.

Moreover, since the intake system parts are connected to the air cleaner through the space between the frames, there is no need to make holes or the like in externally exposed external parts for passing the intake system parts, and the structure can be simplified. For this reason, there is no need to change the shape of the external parts, and the external parts are smooth with few irregularities.Coupled with the fact that the above-mentioned intake system parts are housed inside the cowling, the first half from the cowling to the external parts is It is neatly organized and has a good appearance.

[Example 1] An example of the present invention will be described below with reference to FIGS. 1 to 4.

The frame indicated by reference numeral l in FIG. 1 is equipped with a head vibrator 2 at its front end. A pair of left and right main vibes 3 extending rearward and obliquely downward, and a down tube 4 extending downward are joined to the head vibe 2. The lower end of the down tube 4 extends rearward, and this extended end is joined to the rear end of the main vibe 3 via a bracket 5.

The front end of the limber is pivotally supported on the bracket 5 via a pivot shaft 7, and the rear wheel 8 is supported on the rear end of the rear arm 6.

Further, a front fork 9 is pivotally supported on the head vibe 2 via a steering shaft (not shown). The front fork 9 has left and right fork tubes LQa and lQb.
Place the upper part of the upper bracket 11 and the lower bracket 1
Both brackets II and 12 are connected to the steering shaft.

A front wheel 13 is supported at the lower end of the front fork 9, and the front fork 9 is steered by a steering wheel 14 attached to an upper bracket 11.

The head vibe 2 has a support stay 15 extending forward.
A headlamp 16 and gauges 17 such as a speedometer are attached to the support stay 15.

Further, an engine 20 is mounted in a rear lower part of the head vibe 2, that is, in a space surrounded by a main vibe 3 and a down tube 4 connected to the head vibe 2. The engine 20 of this embodiment is a water-cooled 4-cycle 4-cylinder engine, and four down-draft carburetors 22 connected to each cylinder are installed above the forward-inclined cylinder 21.
is located. An intake pipe 23 extending upward is connected to an intake upstream end of the carburetor 22, and these intake pipes 23 are connected to an air cleaner 24. The air cleaner 24 is located immediately after the head vibrator 2 and above the engine 20 sandwiched between the left and right main vibrators 3, and the intake pipe 23 passes through its lower surface. The air cleaner 24 is surrounded by a cover 25 that serves as an external appearance part that forms the shape of the fuel tank, and this cover 25 is continuous with the seat 26 at the rear.

On the other hand, a synthetic resin cowling 30 is attached to the front end of the frame l. The cowling 30 includes a main body part 31 that covers the front headlamp 16 and instruments 17 of the head vibrator 2, and extends rearward from both left and right sides of the main body part 31 to the above, covering both upper sides of the Radvib 2 and the front fork 9. It is composed of left and right side panel parts 32, and the side panel parts 32 cover the front end portions of the main vibe 3 and the down tube 4 from the sides.

An opening 33 through which the front fork 9 passes is formed in the lower surface of the main body 31 . The opening 33 is for allowing rotation of the front fork 9, and its left and right sides are continuous with the front edge of the side panel portion 32.

For this reason, the opening 33 also serves as an intake port for taking in the running wind from the front as engine cooling air, and is located in front of the upper part of the engine 20. In this cowling 30, the rear end portion of the side panel portion 32 is fixed to the main vibe 3 and the down tube 4 via screws 34, and the lower front end of the main body portion 31 is attached to a bracket 35 welded to the head vibe 2. It is fixed to via a screw 36.

A space 37 is secured between the side panel portion 32 of the cowling 30 and the frame l, as shown in FIG. In this space 37, a pair of left and right intake chambers 38 with a large capacity are located outside the rotation range of the front fork 9.
is located. The intake chamber 38 is supported by the inner surface of the side panel portion 32 via a support 43, and extends substantially horizontally in the front-rear direction on the outside of the front fork 9. A communication passage 40 extending toward the air cleaner 24 is connected to the inner surface of the intake chamber 38 . The communication path 40 is guided inside the frame l through a space 45 between the main vibe 3 and the down tube 4, and reaches below the air cleaner 24. The tips of the communication passages 40 are joined together and connected to a communication port 41 that opens at the lower surface of the front end of the air cleaner 24. Inside the air cleaner 24, an element 42 surrounding the opening of the communication port 41 is provided. It is accommodated.

An intake port 39 is opened at the front end of the intake chamber 38 . The intake port 39 extends forward on both left and right sides of the front fork 9, and is connected to the opening 33 of the cowling 30.
He is present.

Therefore, in the case of this embodiment, the intake chamber 38 provided with the intake port 39 and the communication passage 40 constitute intake system components that guide fresh air to the air cleaner 24.

Therefore, during engine operation, fresh air sucked in from the intake port 39 of the intake chamber 38 expands within the intake chamber 38 and is then guided to the air cleaner 24 via the communication path 40. The fresh air filtered while passing through the element 42 is expanded again in the air cleaner 24 and then distributed to each carburetor 22 through the intake pipe 23.

Note that the side panel portion 32 that covers the intake chamber 38 is
As it advances upward, it is curved inward and projects above the intake port 39, and the intake port 39 is covered from above by this projecting portion 32a. Therefore, rainwater will not be sucked into the intake chamber 38 through the intake port 39 even when the vehicle is running or stopped.

According to this configuration, the left and right intake chambers 38 for guiding fresh air to the air cleaner 24 have intake ports 39 at their front ends connected to the cooling air intake opening 33 of the cowling 30.
During driving, cold fresh air from the front that flows into the opening 33 is directly guided to the intake port 39 of the intake chamber 38, and from the intake chamber 38 via the communication path 40 to the air cleaner 24. sent to.

Therefore, a sufficient amount of fresh air efficiently flows into the intake chamber 38, and the temperature of the air taken into the engine 20 can be suppressed accordingly. Therefore,
It is possible to increase the filling efficiency of intake air and improve engine output.

Further, since the intake chamber 38 extends approximately horizontally in the front-rear direction along the inside of the side panel portion 32 of the cowling 30, the opening 33 of the cowling 30 and the air cleaner 24
This means that the two are connected by the shortest distance. For this reason,
The flow path of fresh air is shortened, and intake resistance can be kept low.

At the same time, since the intake chamber 38 and the communication passage 40 do not need to protrude significantly above the cowling 30'' or the front fork 9, they do not interfere with driving operations and good forward visibility can be ensured.

Moreover, the communication path 40 led out from the intake chamber 38 is connected to the space 45 between the main vibe 3 and the down tube 4.
Since it is guided to the air cleaner 24 through the fuel tank, there is no need to make a hole for passing the communication passage 40 through the cover 25 that forms the shape of the fuel tank, and the shape of the cover 25 can be simplified. Therefore, there is no need to change the shape of the cover 25, and the cover 25 itself becomes smooth with few irregularities.

Therefore, in combination with the fact that the intake chamber 38 and the communication passage 40 are housed inside the cowling 30, the surroundings of the cowling 30 and the cover 25 are neatly organized, and the appearance of the motorcycle is improved.

In the above embodiment, the intake chamber 38 is supported by the support 43.
Although the case has been described in which the intake chamber 38 is fixed to the cowling 30 via a It's okay.

That is, in this device, the intake chamber 38 is fixed to the main vibe 3 and a reinforcing member 51 installed between the main vibe 3 and the down tube 4 using screws 50.

Further, in each of the above embodiments, an intake chamber is disposed between the cowling and the frame, but an intake resonator may be disposed in place of this intake chamber.

[Effects of the Invention] According to the present invention described in detail above, the cold fresh air flowing into the opening of the cowling is guided as it is to the intake port of the intake system component, so that a sufficient amount of fresh air flows into the intake system component. This allows fresh air to flow in efficiently, thereby lowering the temperature of the air taken into the engine and increasing the filling efficiency of the intake air.

Furthermore, since the intake system parts connect the cowling opening and the air cleaner with the shortest possible distance, intake resistance can be kept low. In addition, the intake system parts do not need to protrude significantly above the cowling or the front fork, so they do not interfere with driving operations, and good forward visibility can be ensured.

Furthermore, there is no need to make holes for passing air intake system parts through exterior parts that are exposed to the outside, so there is no need to change the shape of the exterior parts, and the exterior parts themselves can be smooth with fewer irregularities. . Therefore, the area around the cowling and exterior parts is neatly organized, which has the advantage of improving the exterior appearance.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a side view of a motorcycle, FIG. 2 is a plan view of the front half of the motorcycle, and FIG. 3 is a sectional view of an air cleaner portion. Figure 4 is a view taken along the rV-4V line in Figure 3, Figures 5 and 6.
The figures show another embodiment of the present invention, with FIG. 5 being a diagram corresponding to FIG. 4, and FIG. 6 being a sectional view taken along the line VI--VI in FIG. ■...Frame, 2...Head vibe, 9...Front fork, 20...Engine, 24...Air cleaner, 25...Exterior parts (cover), 30...
Cowling, 33... Opening, 38.40... Intake system parts (intake chamber, communication path), 39... Intake port,
45...Space. Applicant's agent Patent attorney Takehiko Suzue 115 Figure 6

Claims (1)

[Claims] An engine is disposed at the rear lower part of a head pipe located at the front end of the frame, and a front fork is rotatably pivoted to the head pipe, and the head pipe is mounted from both left and right sides of the upper part of the front fork. In a motorcycle whose front part is covered with a cowling, an air cleaner is placed above the engine, and the area around this air cleaner is covered with an exterior part that connects to the rear seat. An intake system component is arranged to connect the air intake opening and the above air cleaner and guide fresh air to the air cleaner. An intake device for a motorcycle, characterized in that the intake device extends substantially horizontally, and has a downstream end thereof guided to the air cleaner through a space between frames.