JPH0379235B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an air cleaner for a motorcycle.

Conventionally, motorcycles have been proposed in which an air cleaner is placed below the fuel tank in order to effectively utilize the space between the fuel tank and the engine to make the engine area more compact and to improve the sound insulation effect of intake noise. (Refer to Japanese Unexamined Patent Publication No. 148662/1983). In such motorcycles, there has been a problem in that when a predetermined air cleaner volume required for engine performance is secured, the fuel tank volume becomes insufficient.

The present invention has been made to solve such problems, and includes a fuel tank provided between the head pipe and the seat, an engine disposed below the fuel tank, and a gap between the fuel tank and the engine. In a motorcycle in which an air cleaner case installed in a motorcycle is connected to an intake port of a cylinder of the engine via an intake passage extending downward from the air cleaner case, an open upper surface of the air cleaner case is closed with a bottom surface of the fuel tank; The present invention is characterized in that an air intake port is provided on the bottom surface of the air cleaner case approximately in the middle of both main pipes, and the intake air from the air intake port is communicated with the intake passage through an element.

Preferred embodiments of the air cleaner for a motorcycle according to the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 shows the side shape of a motorcycle to which this embodiment is applied, and Fig. 2 shows the side shape of the motorcycle to which this embodiment is applied.
It is a sectional view along a line. In the figure, a head pipe 10, a main pipe 12, a down tube 14, etc. constitute a vehicle body frame. Down tube 14
An engine 16 is attached to the engine 1.
No. 6 cylinders 18 and 20 are arranged in a substantially V-shape. The engine 16 has four cylinders, but only two cylinders on one side are shown in FIG. A fuel tank 22 is attached to the main pipe 12 of the vehicle body frame above the engine 16. That is, main pipe 1
As shown in FIG. 2, the main pipe 2 is composed of a pair of pipe frames spaced apart from each other by a predetermined distance, and the main pipe 12 is provided with a connecting pipe 24 to connect them as shown in FIG. On the other hand, a U-shaped bracket 26 is provided at the front bottom of the fuel tank 22, and the front part of the fuel tank 22 is supported by the vehicle body frame by fitting the bracket 26 into the connecting pipe 24. Further, the rear end portion 28 of the fuel tank 22 is fixed to a portion 30 of the vehicle body frame via a bracket 31 with a bolt 32. fuel tank 2
2 is composed of an outer panel 34 and an inner panel 36 as shown in FIG.
The lower end of the inner panel 36 is connected to the joint 38.
is welded. As shown in FIG. 2, the interior 40 of the fuel tank 22 formed by the outer panel 34 and the inner panel 36 is formed into a generally horseshoe shape with both sides 41 hanging down, and there is a space below the inner panel 36. A section 42 is formed.

The cylinder heads of cylinders 18 and 20 have intake pipes 48 and 50 integrally directed upward (only one side is shown).
are provided, and these intake pipes 48, 50 communicate with the insides of the cylinders 18, 20 via intake ports (not shown). Furthermore, carburetors 52 and 54 (only one side is shown) are connected to the upper portions of the intake pipes 48 and 50, respectively. An air cleaner case 56 is attached to the upper part of the carburetors 52 and 54. The air cleaner case 56 has a substantially rectangular cross section, and the upper end surface 5
7 is open, and an air intake port 60 is formed in the center of the bottom surface 58 of the air cleaner case approximately midway between the two main pipes 12,12. An element 6 is placed on the bottom surface 58 of the air cleaner case 56.
2 is attached, and the inside of the element 62 communicates with the air intake port 60. Furthermore, the air cleaner case 56 has a carburetor 5 outside this element 62.
Inlet pipes 64 and 66 (only the rear side is shown in FIG. 2) to the two and 54 are open. The air cleaner configured in this manner is located within the space 42 formed below the inner panel 36 of the fuel tank 22,
The open upper end surface 57 is closed by the inner panel 36 of the fuel tank 22. That is, a sealing rubber 72 is attached to the upper end of the side wall 70 of the air cleaner case 56, and the inner panel 36 is pressed against the upper end of the side wall 70 of the air cleaner case 56 via this rubber 72, so that the open upper end surface 57 is blocking the

In the embodiment configured as described above, the air from the intake air supply passage formed between the two main pipes 12, 12 is the air that is taken into the air cleaner from the air intake port 60 and passed through the element 62. is from the intake pipes 64, 66, etc. to the carburetors 52, 5.
4, and further sent from the intake pipes 48, 50 into the cylinders 18, 20 via the intake ports. Also, when replacing the element 62 during inspection and maintenance of the air cleaner, remove the bolt 32 that fixes the rear end 28 of the fuel tank 22 and remove the bracket 26 of the fuel tank 22 from the connecting pipe 24. The upper end surface of is opened. Therefore, in conventional air cleaners in which the air cleaner case has its own lid, it was necessary to loosen the lid's tightening bolt and remove the air cleaner case lid after removing the fuel tank. According to , the inner panel 36 of the fuel tank 22 serves as a lid for the air cleaner case 56, so just by removing the fuel tank 22, the element 6 can be removed.
2 can be exposed, making maintenance and inspection work of the air cleaner easier. Furthermore, since the air cleaner lid is not required, there is an advantage that the number of constituent parts of the air cleaner can be reduced.

In the embodiment described above, the cylinders 18 and 20 are arranged in a V-shape in the longitudinal direction of the vehicle, but the cylinders may be arranged in a V-shape in the vehicle width direction. Furthermore, the present invention can also be applied to motorcycles in which cylinders are arranged in series.

As explained above, the present invention includes a fuel tank provided between a head pipe and a seat, an engine disposed below the fuel tank, and an air cleaner case provided between the fuel tank and the engine. In a motorcycle that communicates with the intake port of the cylinder of the engine via an intake passage extending downward, the open upper surface of the air cleaner case is closed with the bottom surface of the fuel tank, and the The air cleaner case is characterized in that an air intake port is provided on the bottom surface of the air cleaner case, and the intake air from the air intake port is communicated with the intake passage through an element.

Therefore, since the open top surface of the air cleaner case is covered by the bottom surface of the fuel tank, there is no need for a lid on the air cleaner case, and even if a predetermined volume of the air cleaner is secured, the volume of the fuel tank can be increased by the space provided by the lid. I can do it. Further, since the number of constituent parts of the air cleaner is reduced, costs are reduced, and maintenance and inspection of the air cleaner is facilitated because the element is exposed simply by removing the fuel tank.

Furthermore, an air intake port is provided on the bottom of the air cleaner case approximately in the middle of both main pipes, and the intake air from the air intake port is communicated with the intake passage through an element, so there is a dead space approximately equal to the thickness of the main pipes. can be effectively used as an intake air supply passage, and the overall height of the motorcycle can be reduced accordingly, making it more compact.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view showing the general shape of a motorcycle to which this embodiment is applied, and FIG. 2 is a sectional view taken along the upper line in FIG. 1. 12...Main pipe, 16...Engine, 1
8, 20... cylinder, 22... fuel tank, 36...
...Inner panel forming the bottom of the fuel tank, 5
6... Air cleaner case, 58... Bottom of air cleaner case, 60... Air intake port, 62...
element.

Claims (1)

[Claims] 1 A fuel tank is provided between the head pipe and the seat, an engine is disposed below the fuel tank, and an air cleaner case provided between the fuel tank and the engine is connected to an intake passage extending downward from the air cleaner case. In the motorcycle, the open upper end surface of the air cleaner case is closed with the bottom surface of the fuel tank, and an air intake port is provided on the bottom surface of the air cleaner case approximately midway between the two main pipes. 1. An air cleaner for a motorcycle, characterized in that an air cleaner for a motorcycle is provided, and the intake air from the air intake port is communicated with the intake passage through an element.