JPH03135892A - Motorcycle - Google Patents

Abstract

PURPOSE:To ensure fuel tank capacity by arranging an air cleaner communicating to an intake port, on the rear upper side of a forward tilting air cylinder having an intake port on the rear side, and by arranging a fuel tank between the cleaner and a mission case. CONSTITUTION:An intake pipe 13 is provided obliquely to the rear upper part, on an intake port of the rear upper part of an air cylinder of a forward tilting engine 2, and a carburetor 12 is connected thereto. An air cleaner 14 located on the rear upper part of the engine 2 is connected to the carburetor 12. A fuel tank 15 is arranged between right and left main frames 1a, and between the air cleaner 14 and a mission case 2a of the engine 2. Interference between the air cleaner 14 and the fuel tank 15 can be prevented in a state that the air cylinder is forward tilted and the center of gravity is kept low, and, without the need of forming a recessed part for storing the air cleaner 14, on the lower part of the tank 15, whereby the capacity of the fuel tank 15 can be kept sufficient.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a motorcycle equipped with an engine having an intake port on the rear side and cylinders tilted forward.

[Conventional technology]

Conventionally, one method of lowering the vehicle height of a motorcycle and lowering the center of gravity is to tilt the engine cylinders forward. However, in motorcycles equipped with engines that have intake ports on the rear side of the cylinders, the carburetor and air cleaner are located at the rear of the cylinders, so when the cylinders are tilted forward as described above, the air cleaners can reach the fuel tank. Therefore, in conventional motorcycles of this type, in order to keep the vehicle height low, a recess is provided at the bottom of the fuel tank, and the air cleaner faces into this recess.

[Problem to be solved by the invention]

However, if the lower part of the fuel tank is recessed as described above to avoid interference between the air cleaner and the fuel tank, the capacity of the fuel tank will be reduced by the recessed portion.

[Means to solve the problem]

In the motorcycle according to the present invention, an air cleaner communicating with an intake port is disposed at the upper rear side of the cylinder, and a fuel tank is disposed between the air cleaner and the transmission case of the engine.

[For production]

Interference between the air cleaner and the fuel tank can be avoided, and the intake passage between the air cleaner and the intake port of the engine is formed in a substantially straight line.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

FIG. 1 is a side view showing a motorcycle according to the present invention, and FIG. 2 is a plan view showing a schematic configuration of a front wheel suspension system. In these figures, 1 indicates a frame. Left and right main frames 1 that support seats 3, etc.
a, and a subframe 1b rotatably connected to the front part of the main frame 1a. The subframe 1b is provided with a steering shaft part 1c at its front end that rotatably supports a steering device 4 consisting of a handle, a brake lever, etc., and is connected to the main frame la by a drive device (not shown). It is configured so that the height of the steering device 4 can be changed by rotating around the connecting portion. Further, the engine 2 includes a crankcase 2a in which a transmission case is integrally provided, and a cylinder 2b having an intake port on the rear side, and the cylinder 2b is inclined toward the front side of the vehicle body.

Reference numeral 5 denotes a front wheel suspension device that suspends the front wheel 6 in a steerable manner, and includes a knuckle 5a that rotatably supports the front wheel 6, and a lower arm 5b that supports the knuckle 5a in a steerable manner and is supported by the engine 2 in a vertically swingable manner. .

It is composed of an upper arm 50 and the like. Note that a front cushion (not shown) is interposed between the lower arm 5b and the engine 2. Reference numeral 7 denotes a steering hydraulic cylinder, and the main body of the hydraulic cylinder 7 is fixed to the lower arm 5b, and the advancing/retracting rod is connected to the knuckle 5a.
It is connected to a control device (not shown) that controls hydraulic pressure according to the rotational movement of. That is, this hydraulic cylinder 7
In the front wheel suspension system 5 equipped with this, the hydraulic cylinder 7 is driven by rotating the steering device 4, and the front wheels 6 are thereby steered.

Reference numeral 8 denotes a rear arm that rotatably supports the rear wheel 9. This rear arm 8 is swingably supported by the main frame 1a of the frame 1 via a pivot shaft 10, and the rear arm 8 and the main frame 1a are A rear cushion unit 11 is interposed between the two.

Reference numeral 12 denotes a carburetor, and this carburetor 12 is connected to the engine 2 via an intake pipe 13 extending diagonally upward and rearward from the intake port of the engine 2.

Reference numeral 14 denotes an air cleaner, which is connected to the carburetor 12 via a joint 14a and supported by the frame 1.

Further, this air cleaner 14 has an air cleaner element 14b built therein, and a silencer 14c that is open toward the rear is provided in the suction portion.

15 is a fuel tank, and this fuel tank 15 is located between the left and right main frames 1a, and is connected to the air cleaner 14.
and the transmission case of the engine 2, and is supported by the main frame 1. A fuel supply pump (not shown) such as an electromagnetic pump is connected to a fuel supply pipe (not shown) that supplies fuel from the fuel tank 15 to the carburetor 12, and this fuel supply pump supplies fuel to the carburetor 12. 12.

Reference numeral 16 denotes a fuel supply pipe for replenishing the fuel tank 15 with fuel, and is provided so as to protrude from the fuel tank 15 so as to face into the fuel supply section provided in the front part of the seat 3.

17 is a radiator, and as shown in FIG. 2, two radiators 17 are arranged in front of the engine 2, on the left and right, and are attached to the cylinder 2b of the engine 2 via an upper bracket 17a and a lower bracket 17b. . In addition, 18 is a radiator cover 19 for guiding the traveling wind to the radiator 17, which is a front cowl.

In the motorcycle configured in this way, the outside air guided into the air cleaner 14 from the silencer 14c via the air cleaner element 14b is
The air is sucked into the carburetor 12 from a, and is led to the engine 2 through the intake pipe 13.

That is, the intake air is supplied linearly from the air cleaner 14 toward the intake port.

Therefore, according to the present invention, while the cylinder is tilted forward to have a low center of gravity, interference between the air cleaner 14 and the fuel tank 15 can be avoided without making the fuel tank smaller.
Since the intake passage between the air cleaner 14 and the intake port of the engine 2 can be formed into a substantially straight line, intake resistance can be reduced.

In the above embodiment, only one fuel tank 15 is provided, but an auxiliary fuel tank may be additionally provided above the engine 2 as shown in FIG. 3.

Fig. 3 is a side view of a motorcycle showing another embodiment, and in this figure, the same or equivalent members as those explained in Figs. 1 and 2 are given the same reference numerals and detailed explanations are omitted. do. In FIG. 3, reference numeral 21 denotes an auxiliary fuel tank, which is disposed above the engine 2 and supported by an upper bracket 17a for attaching the radiator 17 to the engine 2. Also,
The auxiliary fuel tank 21 has a front portion extending below the rotating shaft portion of the steering device 4, and a fuel filler port that is closed by a fuel cap 22 at the upper rear portion. Reference numeral 23 denotes an auxiliary fuel pipe for connecting the auxiliary fuel tank 21 and the fuel tank 15. When this auxiliary fuel tank 21 is installed, fuel is supplied to the lower fuel tank 15 through the auxiliary fuel pipe 23, so the fuel tank 15 does not need to be provided with a fuel supply pipe.

In a motorcycle equipped with the auxiliary fuel tank 21 in this way, not only can the amount of fuel carried be increased, but also the space between the steering device 4 and the engine 2 can be used effectively.

Further, although the above embodiment shows an example in which the steering is performed using the hydraulic cylinder 7, an electric actuator or the like may be used instead of the hydraulic cylinder, and a flexible link mechanism is provided between the steering device 4 and the knuckle 5a. It is also possible to provide a structure in which direct steering is performed by the steering device 4 through an intervention.

Furthermore, although the embodiment described above shows an example in which the carburetor 12 is connected to the intake pipe 13, a fuel injection device may be connected in place of the carburetor 12. Even if a fuel injection device is connected, the same effect as in the above embodiment can be obtained.

〔Effect of the invention〕

As explained above, the motorcycle according to the present invention has an air cleaner arranged at the rear upper side of the cylinder, which communicates with the intake port,
Since the fuel tank is disposed between the air cleaner and the mission case of the engine, interference between the air cleaner and the fuel tank can be avoided without making the fuel tank small. Therefore, the intake passage between the air cleaner and the engine intake port can be formed into a substantially straight line to reduce intake resistance, thereby increasing the intake air filling efficiency. Ba,
The fuel tank is placed close to the engine's mission case, and the relatively light air cleaner is placed above the fuel tank, allowing heavy items such as the engine and fuel tank to be placed near the center of the vehicle. mosquito,
The center of gravity can be lowered.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a motorcycle according to the present invention, FIG. 2 is a plan view showing a schematic configuration of a front wheel suspension system, and FIG. 3 is a side view of a motorcycle showing another embodiment. 1...Frame, 2...Engine, 2a...
・Crankcase, 2b...Cylinder 12...
... Carburetor, 13... Intake pipe, 14... Air cleaner, 15... Fuel tank.

Claims (1)

[Claims] In a motorcycle equipped with an engine having an intake port on the rear side and a cylinder tilted forward, an air cleaner communicating with the intake port is disposed above the rear side of the cylinder, and the air cleaner and the mission case of the engine are arranged. A motorcycle characterized by having a fuel tank disposed between the two wheels.