JPH0617677Y2 - Motorcycle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a motorcycle equipped with a water-cooled V-type engine having a plurality of cylinders.

[Prior Art] Conventionally, some motorcycles are equipped with a water-cooled V-type engine having a plurality of cylinders between front wheels and rear wheels. It is known that a radiator is arranged in front of such a water-cooled V-type engine and the radiator is cooled by traveling wind (for example, Japanese Utility Model Laid-Open No. 58-17217).

[Problems to be solved by the invention] In this case, the air that has passed through the radiator and becomes high in temperature acts on the engine, and particularly in the case of using a carburetor, percolation and other problems are likely to occur. This tendency is strong in the one located immediately after.

Therefore, it is conceivable that, for example, by changing the arrangement of the water-cooled V-type engine or the arrangement of the carburetor itself, it is possible to prevent the air which has passed through the radiator and becomes high heat from acting on the carburetor. In this case, there arises a problem that the vehicle body width becomes wide depending on the positions where the water-cooled V-type engine and the carburetor are arranged, and there is a large difference in the length of the intake passage for each cylinder.

The present invention has been made in view of such a point, and the vehicle body width can be narrowed by the arrangement of the V-type engine and the carburetor, and the carburetor can be arranged in the intake passage of each cylinder without difficulty, and the carburetor can be cooled. The purpose is to provide a motorcycle with improved performance.

[Means for Solving the Problems] In order to solve the above problems, the motorcycle of the present invention is
The V-type engine having a plurality of cylinders mounted between the front wheels and the rear wheels is arranged in a vertically opened V-shape so that the sandwiching angle direction of the V-shape formed by the plurality of cylinders is directed substantially forward.
The exhaust pipes connected to the respective cylinders are arranged outside the V-shaped sandwiching angle of the cylinders, and a plurality of carburetors connected to the respective cylinders are arranged vertically within the V-shaped sandwiching angle. The upper carburetor is connected to the upper cylinder, while the lower carburetor is connected to the lower cylinder, and the radiator arranged in front of the V-type engine is connected to the left half part connected by the upper and lower tanks. It is composed of two halves, the right half, and a space is provided between the two halves, and the upper and lower carburetors are located behind the space and along the space when viewed from the front. Is characterized by.

[Operation] According to the present invention, the V-type engine is arranged in a vertical opening V-shape so that the V-shaped enclosing angle direction formed by a plurality of cylinders is directed substantially forward. The width of the vehicle body can be made narrower than that of a V-shaped engine having a laterally opening V-shape.

Further, by disposing the exhaust pipe connected to each cylinder outside the V-shaped sandwiching angle of the cylinder, it is possible to reduce the heat accumulated in the V bank.

Further, a plurality of carburetors connected to the respective cylinders are arranged vertically within the included angle of the V-shape, the upper carburetor is connected to the upper cylinder, while the lower carburetor is connected to the lower cylinder. Therefore, the carburetors can be vertically arranged without causing a large difference in the intake passage length of each cylinder.

In addition, the radiator placed in front of the V-type engine
2 of left half and right half connected by upper and lower tanks
A space is provided between the two halves, and the upper and lower carburetors are located in the rear of this space and along the space when viewed from the front. To efficiently guide the traveling wind to the carburetor in the smallest space of the radiator. You can

Also, by configuring the radiator with two halves, the left half and the right half, which are connected by the upper and lower tanks,
An increase in the width of the vehicle body can be suppressed as compared with the case where two radiators are arranged on the left and right.

[Embodiment] The present invention will be described below with reference to the illustrated embodiment. First
The figure is a side view of the motorcycle, FIG. 2 is a front view of a radiator portion of the motorcycle, and FIG. 3 is a plan view of a radiator portion of the motorcycle.

In the figure, reference numeral 1 denotes a motorcycle, which supports a front fork 4 which supports a front wheel 3 on a steering shaft tube 2a at a front end of a vehicle body frame 2 so as to be capable of turning left and right, and a rear wheel 6 which supports a rear wheel 6 at a rear portion thereof. is doing. The vehicle body frame 2 has a descending pipe 2b extending downward from the steering shaft pipe 2a and a main column 2c extending rearward, and the lower end portion of them supports the V-type engine 7.

The V-type engine 7 is mounted between the front wheels 3 and the rear wheels 6 and has a plurality of cylinders, that is, two cylinders 7a on the upper side and two cylinders 7b on the lower side.

The V-type engine 7 is arranged in a vertically-open V-shape so that a V-shaped sandwiching angle direction formed by the cylinders 7a and 7b faces substantially forward. In this way, the V-type engine 7 is arranged in a longitudinally open V-shape so that the sandwiching angle direction of the V-shape formed by the plurality of cylinders 7a and 7b is directed substantially forward. The width of the vehicle body can be narrower than that of a V-shaped engine having a laterally opening V-shape.

Further, a plurality of vaporizers 10a and 10b connected to the respective cylinders 7a and 7b are arranged vertically within the V-shaped sandwiching angle. The upper vaporizer 10a is connected to the upper cylinder 7a, and the lower vaporizer 10b is connected to the lower cylinder 7b. In this way, by arranging the plurality of carburetors 10a and 10b connected to the respective cylinders 7a and 7b up and down within the included angle of the V-shape, the intake passage length of each of the cylinders 7a and 7b is increased. Vaporizer 10 without making a difference
It is possible to arrange a and 10b vertically.

Further, exhaust pipes 11a, 11b connected to the respective cylinders 7a, 7b are arranged outside the V-shaped sandwiching angle of the cylinders 7a, 7b, and the upper exhaust pipe 11a extends rearward from below the fuel tank 12, Further, the lower exhaust pipe 11b passes below the V-type engine 7 and extends rearward. In this way, the exhaust pipes 11a, 11 connected to the respective cylinders 7a, 7b
By disposing b to the outside of the V-shaped sandwiching angle of the cylinders 7a and 7b, it is possible to reduce the heat accumulated in the V bank.

A radiator 8 is attached to the descending pipe 2b in front of the V-type engine 7. The radiator 8 is the descending pipe 2b.
Is connected to the V-type engine 7 through a water passage formed in the interior of the hose and the hose 9.

As shown in FIGS. 2 and 3, this radiator 8 is composed of a cooling core composed of two left half portions 8c and right half portions 8d connected by upper and lower tanks 8a and 8b.
A space S where no cooling core exists is provided between the two halves 8c and 8d, and upper and lower carburetors 10a and 10b are located behind the space S and along the space S in a front view.

Further, by composing the radiator 8 with two halves, a left half portion 8c and a right half portion 8d, which are connected by the upper and lower tanks 8a and 8b, as compared with the case where the two radiators are arranged on the left and right sides. It is possible to suppress an increase in vehicle body width.

Then, a part of the traveling wind generated along with the traveling of the motorcycle acts on the left half portion 8c and the right half portion 8d which form the cooling core,
The cooling water passing there is cooled and heated, and flows backward. On the other hand, a part passes through the space S formed between the left half portion 8c and the right half portion 8d to directly act on the rear carburetors 10a and 10b and is heated by the heat transfer from the V-type engine 7. The vaporizers 10a and 10b are cooled. In this way, a plurality of vaporizers 10 arranged in the V bank where heat is easily accumulated
The traveling wind can be efficiently guided to the rear carburetors 10a and 10b in the minimum space S of the radiator 8 with respect to a and 10b.

[Effects of the Invention] As described above, according to the present invention, the V-type engine is arranged in a vertically opened V-shape so that the sandwiching angle direction of the V-shape formed by a plurality of cylinders is substantially forward. The width of the vehicle body can be made narrower than that of a directional parallel multi-cylinder, a V-shaped engine having a laterally opening V-shape, and the like.

Further, since the exhaust pipe connected to each cylinder is arranged outside the V-shaped angle of the cylinder, the heat trapped in the V bank can be reduced.

Further, a plurality of carburetors connected to the respective cylinders are arranged vertically within the included angle of the V-shape, the upper carburetor is connected to the upper cylinder, while the lower carburetor is connected to the lower cylinder. Therefore, the carburetors can be vertically arranged without causing a large difference in the intake passage length for each cylinder.

In addition, the radiator placed in front of the V-type engine
2 of left half and right half connected by upper and lower tanks
A space is provided between the halves, and the upper and lower carburetors are located behind the space and along the space when viewed from the front, so that the running wind is efficiently guided to the carburetor in the smallest space of the radiator. be able to.

Also, by configuring the radiator with two halves, the left half and the right half, which are connected by the upper and lower tanks,
An increase in the width of the vehicle body can be suppressed as compared with the case where two radiators are arranged on the left and right.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a side view of a motorcycle, Fig. 2 is a front view of a radiator portion of the motorcycle, and Fig. 3 is a plan view of a radiator portion of the motorcycle. . 2a ... Steering shaft tube, 2b ... Descending tube 2c ... Main column, 7 ... V-type engine 7a, 7b ... Cylinder, 10a, 10b ... Vaporizer 8 ... Radiator, 8a, 8b ... Up and down Tank 8c ... left half, 8d ... right half S ... space

Claims (1)

[Scope of utility model registration request] 1. A V-type engine having a plurality of cylinders mounted between a front wheel and a rear wheel, wherein a V-shaped engine formed by the plurality of cylinders has a vertically-open V-shape so that a sandwiching angle direction of the V-shape is substantially forward. And the exhaust pipes connected to the respective cylinders are arranged outside the V-shaped enclosing angle of the cylinder, and a plurality of carburetors connected to the respective cylinders are arranged within the V-shaped enclosing angle. The upper carburetor is connected to the upper cylinder, the lower carburetor is connected to the lower cylinder, and the radiator arranged in front of the V-type engine is connected by the upper and lower tanks. The upper and lower carburetors are composed of two halves, a left half and a right half, and a space is provided between the two halves. A motorcycle characterized by having a.