JP2971143B2 - Radiator mounting structure for motorcycles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention is, V-type 2-cylinder liquid-cooled 2 support
The present invention relates to a radiator mounting structure for a motorcycle equipped with a vehicle engine.

[0002]

2. Description of the Related Art There is known a motorcycle in which a V-type two-cylinder liquid-cooled two-stroke engine is mounted such that a V-type space between the two cylinders points forward. For example, JP-A-61-21
No. 5121 discloses an arrangement in which a radiator is provided in a V-shaped space and a lower portion of the radiator is supported by an engine.
However, when an intake passage of any one of the cylinders, for example, a carburetor of a lower cylinder is disposed in the V-shaped space, the intake passage interferes with the radiator, and the layout is impossible. .

[0003] Japanese Patent Application Laid-Open No. 63-284083 discloses a configuration in which a radiator is attached to the tip of a lower cylinder. However, in this case, a small and light oil cooler may be used, but a large radiator has a heavy weight, so that there is a problem that the radiator cannot be mounted or the strength of a lower cylinder is insufficient.

[0004]

SUMMARY OF THE INVENTION Therefore, the problem to be solved by the present invention is that the intake passage arranged in the V-shaped space does not interfere with the radiator and is suitable for mounting a large radiator.
Another object of the present invention is to provide a radiator mounting structure for a motorcycle, which can improve the maintainability .

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a motorcycle equipped with a V-type two-cylinder liquid-cooled two-stroke engine such that a V-type space formed between two cylinders points forward. The intake passage of the lower cylinder is disposed in the V-shaped space so as to be deflected to the deviating side of the lower cylinder,
The air cleaner that supplies intake air to the intake passage is
While disposed position side, the cylinder of the upper exhaust inflation tube cylinder of the above
From the lower surface of the lower cylinder through the anti-deflection side of the lower cylinder
Exhaust expansion pipes are placed under the engine from the bottom of the lower cylinder.
Guided towards, it holds the upper portion of the radiator which is disposed in front of the cylinders of the upper to the vehicle body frame in the left and right two places, a vehicle body frame or the engine at the bottom of the radiator on one side of the counter-deflection side of the cylinders under the Holding the engine from the radiator
The tube that guides the cooling water to the water pump
This is achieved by a radiator mounting structure for a motorcycle, wherein the radiator mounting structure is characterized in that the radiator is passed through the cylinder on the offset side .

[0006]

1 is a side view of an embodiment of the present invention, FIG. 2 is an enlarged view of a main part thereof, and FIG. 3 is a front view.

In FIG. 1, reference numeral 10 denotes a diamond-shaped vehicle body frame, which includes a front frame 12 and a rear frame 14.
Is a combination of The front frame 12 has a head pipe 16 and a pair of left and right side frames 18 (18a, 18b, see FIG. 3) extending obliquely rearward therefrom. The side frame 18 is formed by joining two sheet metal members having a U-shaped cross section so as to face each other to form a box having a square cross section, and a rear portion thereof is curved downward. Two front forks 20 are held on the head pipe 16 so as to be rotatable left and right, and a steering front wheel 22 is attached to the lower end thereof.

The rear frame 14 comprises a seat rail 24 and an auxiliary seat rail 26. Sheet rail 24
Is formed by a pair of left and right upper tubes 24a and a lower tube 24b for supporting the upper tubes 24a from below. The front ends of the upper and lower tubes 24a, 24b are fixed to the side frame 18.

The auxiliary seat rail 26 has a pair of left and right tubes.
The bridge 26a is connected to each other by front and rear bridges 28 and 30 to be integrated. The front half of the tube 26a is bent obliquely downward and forward, and this lowered portion is bolted to the rear end of the upper tube 24a of the seat rail 24 and the rear lower part of the lower tube 24b. Have been.

Reference numeral 32 denotes a rear wheel, the front end of which is held at the rear end of a rear arm 34 which is supported by the side frame 18 by a pivot shaft 33. The rear arm 34 is elastically supported by a single cushion unit (not shown) arranged near the center of the vehicle body. A rear fender 36 is attached to the rear arm 34.

Reference numeral 38 denotes a V-type two-cycle two-cylinder liquid-cooled engine. The engine 38 is mounted on the side frame 18 such that a V-shaped space formed between two cylinders 38a and 38b forming a V-shape points forward.

That is, the rear portion of the engine 38 is elastically supported by a pair of upper and lower rear support portions A and B sandwiching the pivot shaft 33 from above and below. Here, both support portions A and B are attached to brackets 64 and 66 respectively fixed to cross members 60 and 62 connecting both side frames 18a and 18b. The front of the engine 38 is located on both side frames 18.
a and 18b are elastically supported by a front support portion C located on the lower surface. That is, a pair of left and right arms 68 are fixed to the crankcase of the engine 38 near the mounting portion of the upper cylinder 38 a, and the upper ends of the arms 68 are held by an eye bracket 70 fixed to the side frame 18.
2 supported.

Reference numeral 74 denotes a carburetor which forms an intake passage for the upper cylinder 38a (FIG. 2), and is connected to the rear of the cylinder 38a. The carburetor 74 is supplied with intake air from an air cleaner (not shown) housed below the fuel tank 46.

Reference numeral 76 denotes a carburetor which forms an intake passage for the lower cylinder 78b. Has been established. The intake air is supplied to the carburetor 76 from an air cleaner 80 housed in a cowling 78 on the side of the deflection direction of the lower cylinder 38b (FIG. 3).

Reference numeral 40 denotes an exhaust expansion pipe of the upper cylinder, and reference numeral 42 denotes an exhaust expansion pipe of the lower cylinder. 44 is a radiator for cooling the engine 38, and 46 is a fuel tank. The front portion of the fuel tank 46 rests on the side frame 18, and the rear portion rests on the upper tube 24a of the seat rail 24. Reference numeral 48 denotes a driver's seat.
4 is attached to the upper tube 24a. Below the driver's seat 48, a lubricating oil tank 50 and a battery 52 are accommodated.

A passenger seat 54 is attached to the auxiliary seat 26, and a license plate 5 is provided.
6. Parts for traveling in the city such as tail lights 58, turn signals, luggage boxes, tool bags, etc. are attached.

As shown in FIG. 3, the radiator 44 has upper and lower two right and left side frames 18a and 18b.
Are held via rubber dampers 82, 82. Further, the lower left side of the radiator 44, that is, the anti-deflection side of the lower cylinder 38b, is
It is held at 0. Here the arm 74 and the radiator 44
A rubber damper 86 is interposed at the connection with the lower part.

The coolant flowing out of the cylinder heads of the cylinders 38a and 38b enters the radiator 44 from inlets 88 and 90 (FIG. 3) provided at the upper right of the radiator 44. The cooling liquid is cooled while flowing in the radiator 44 from right to left (from left to right in FIG. 3) in the lateral direction, and is guided from the outlet 92 on the left side to the water pump 96 (FIG. 2) by the tube 94.

As described above, the upper portion of the radiator 44 is supported by the left and right side frames 18a and 18b at two places, and the lower portion of the radiator 44 is supported only by the left side.
The V-shaped space formed by a and 38b is open to the side of the vehicle body on the right side. For this reason, when the maintainability of the upper cylinder 38a is made variable, for example, when the spark plug and the exhaust timing near the exhaust port are made variable, it is convenient to maintain the drive mechanism and the like.

Further, the carburetor 76 can be easily accommodated in the V-shaped space between the upper and lower cylinders 38a and 38b, so that not only the layout is convenient, but also the maintenance is easy from the right side.

Although the radiator 44 cools the engine coolant in this embodiment, the present invention may be applied to a radiator for cooling engine oil. The lower part of the radiator 44 is provided with the engine 3 such as the cylinder head of the upper cylinder 38a.
8 may be supported.

[0022]

As described above, according to the present invention, the intake passage of the lower cylinder is deflected to the deviating side of the cylinder below the V-shaped space formed by the upper and lower cylinders, and the lower part of the radiator is And the opposite piece
Since it is supported by the body frame or the engine on the side , the intake passage of the lower cylinder can be easily arranged in the V-shaped space without interfering with the radiator, which is convenient in terms of layout.
Also , the exhaust expansion pipe of the upper cylinder is
Guide to the lower part of the engine through the eccentric side, exhaust of the lower cylinder
Guide the expansion tube from below to the bottom of the engine,
Deflection of the cylinder above the tube that leads the cooling water from the pump to the water pump
The air cleaner provided on the eccentric side of the lower cylinder
If the air cleaner is removed, the side of the engine will open to the side on the eccentric side of the lower cylinder, making it easier to maintain the intake system of the upper and lower cylinders. Become.

[Brief description of the drawings]

FIG. 1 is a side view of one embodiment of the present invention.

FIG. 2 is an enlarged view of a main part thereof.

FIG. 3 is a front view.

[Explanation of symbols]

38 engine 38a upper cylinder 38b lower cylinder 40, 42 exhaust expansion pipe 44 radiator 76 carburetor 84 forming intake passage 84 arm holding lower radiator 94 tube 96 water pump

Claims (1)

(57) [Claims] In a motorcycle equipped with a V-type two-cylinder liquid-cooled two-cycle engine such that a V-type space formed between two cylinders points forward, a lower cylinder is mounted on a lower cylinder. An intake passage is disposed in the V-shaped space so as to be deviated toward the deviating side of the lower cylinder to supply intake air to the intake passage of the lower cylinder.
The cleaner is located on the eccentric side of the lower cylinder while the upper
Anti-deflection of the lower cylinder from the lower surface of the upper cylinder to the exhaust expansion pipe of the cylinder
Through the side and also the lower cylinder exhaust expansion pipe to the lower cylinder bottom
Led from below the respective engine, holds the upper portion of the radiator which is disposed in front of the cylinders of the upper to the vehicle body frame in the left and right two places, anti deflection side of the under-cylinder at the bottom of the radiator
On one side of the body frame or the engine ,
Cooling water is supplied from the radiator to a water pump provided in the engine.
A radiator mounting structure for a motorcycle, wherein a guiding tube is passed through the deviated side of the upper cylinder .