JP2509819B2 - Water-cooled multi-cylinder engine system for motorcycles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a motorcycle in which a radiator for heat exchange of cooling water of a water-cooled multi-cylinder engine mounted on a vehicle body frame is located below the water-cooled multi-cylinder engine. The present invention relates to a water-cooled multi-cylinder engine device.

[Prior Art] It is generally known that a motorcycle equipped with a water-cooled multi-cylinder engine is provided with a radiator in a down tube in front of the engine. However, when arranging the radiator between the front of the engine and the front wheels, a large radiator that can sufficiently cool the engine cannot be arranged due to the mounting space of the vehicle body and the aerodynamic resistance of the vehicle body. Therefore, there is one in which a part of the radiator is separated and provided below the vehicle body frame.

[Problems to be Solved by the Invention] However, when such a separated radiator is used, there is a problem that the piping of the cooling water pipe becomes complicated and the bank angle cannot be sufficiently obtained.

The present invention has been made in view of the above circumstances, and an object thereof is to eliminate the radiator in front of the engine and to obtain a sufficient bank angle and to provide a water-cooled multi-motor vehicle with good engine cooling efficiency. It is intended to provide a cylinder engine device.

[Means for Solving the Problems] In order to achieve the above-mentioned object, a water-cooled multi-cylinder engine device for a motorcycle according to the present invention includes a radiator for heat-exchanged cooling water of a water-cooled multi-cylinder engine mounted on a vehicle body frame. In a motorcycle positioned below a water-cooled multi-cylinder engine, a fairing that covers the side and front of the engine is provided, and a front fork turning opening and a radiator cooling air intake are formed on the front surface of the fairing. A traveling air duct protruding from the cooling air intake port toward the radiator is formed integrally with the fairing, the width of the lower end of the radiator is made smaller than the width of the upper end, and the water-cooled multi-cooler located above the radiator is formed. At the front of the cylinder engine, intake system means such as a carburetor are arranged on the left and right sides of the vehicle body within the left and right width of the upper end of the radiator, and the front end of the intake system means is set at the front. Characterized in that to face the front of the vehicle body from the radiator is intended.

[Operation] In the present invention, when the vehicle starts traveling, a part of the traveling wind that flows in the front-rear direction of the vehicle body passes through the opening for rotating the front fork provided in the fairing, and the intake system means flows down to cool the engine. Further, a part of the traveling wind from the radiator cooling air intake passes through the radiator via the traveling air duct protruding from the cooling air intake toward the radiator to cool the engine cooling water therein. Furthermore, the warm running wind that has passed through this radiator is discharged without affecting the intake system means. Therefore, a part of the traveling wind flows down the intake system means to cool the engine, and a part of the running air cools the engine cooling water. The cooling efficiency can be sufficiently improved without being affected.

Since the radiator is located below the engine, the center of gravity of the vehicle body is lowered, and the width of the lower end of the radiator is small, so that the bank angle of the vehicle is sufficient.

[Embodiment] An embodiment of the present invention will be described with reference to the accompanying drawings.

In the figure, reference numeral 1 is a motorcycle for competition, in which a front fork 4 having a front wheel 3 is rotatably supported in front of a vehicle body frame 2, and a fork 6 having a rear wheel 5 in the rear is vertically swingable. Supported by. Reference numeral 2a is a down tube which constitutes the vehicle body frame 2, and 2b is also a main pipe, which are connected to each other below the engine to form a so-called cradle type frame. Reference numeral 7 is a water-cooled two-stroke multi-cylinder engine suspended in the center of the vehicle body frame 2, and 8 is a drive chain wound between the engine 7 and the rear wheels 5. A fairing 10 having a windshield 9 is attached to the body frame 2, and the fairing 10 is provided with an opening (see FIG. 2) for rotating the front fork 4 and a cooling air intake 10a on the front surface thereof. ing. The traveling wind from the opening for rotating the front fork 4 is used for cooling the engine 7, and the lower surface of the engine 7 has a traveling air duct 10d leading to the front intake 10a by a part of the fairing. Are formed to form the traveling air passage 11. 12 is a radiator provided in the traveling wind passage 11, 13 is a seat of the passenger,
13a is a fuel tank.

The periphery of the cooling air intake 10a is widened like a trumpet so that the traveling wind passing through the side of the front wheel 3 is guided to the traveling air passage 11 by the duct 10d.

3 and 4 show the surroundings of the water-cooled multi-cylinder engine 7 in detail. The engine 7 has a crankcase 7a and a cylinder 7b extending upward. Reference numeral 14 is an intake system means such as a carburetor connected to the front surface of the cylinder 7b of the engine 7, and is arranged on the left and right sides of the vehicle body within the left and right width of the upper end of the radiator 12 as shown in FIG.
I try to improve the circulation of the running wind. The front ends of the intake system means 14, 14 are made to face the front of the vehicle body from the radiator 12 as shown in FIG. Further, 15 is an exhaust pipe connected to the rear surface of the cylinder 7b of the engine 7,
It has a large-diameter expansion chamber 15a and a silencer 15b. In this way, the structure in which the exhaust pipe 15 is connected to the rear surface of the cylinder 7b can leave a large space on the lower surface of the engine 7 as compared with the conventional structure in which the exhaust pipe 15 is extended rearward through the lower surface of the engine. Reference numeral 16 denotes a cooling water pump, the discharge port of which is connected to the water supply port of the cylinder 7b through a water supply pipe 17a, and the suction port of which is connected to the drainage port of the cylinder 7b through the water supply pipe 17b and absorbs water. A radiator that exchanges heat with the cooling water is provided in the middle of the pipe 17b. The radiator 12 has a heat radiating portion 12a and a cooling water tank 12 on the right and left sides so as to sandwich it.
b and 12b are arranged, and the width of the lower end of the heat radiating portion is made smaller than the width of the upper end to reduce the inclination of the radiator. 18 and 19 are stays, which are bolted to the vehicle body frame 2 with the stays 18 and 19 inclined so that the lower portions thereof protrude forward. The traveling air passage 11 formed in the lower portion of the engine 7 is covered by the lower wall 10c of the fairing 10 to prevent muddy water and mud on the road surface, which is splashed up by the front wheels 3, from reaching the radiator 12. There is. The traveling air duct 10d extends from the intake 10a to the front surface of the radiator 12.

In the embodiment apparatus having the above configuration, since the left and right intake system means 14, 14 are within the left and right width of the upper end of the radiator 12,
Even if the fairing 10 is brought close to the left and right side surfaces of the radiator 12, a sufficient distance can be formed between the intake system means 14 and the fairing 10, and the intake system means 14 can be formed within the width of the upper end of the radiator 12. Since the width of the lower end of the radiator 12 is made smaller than the upper end of the radiator 12, the outer shape of the fairing 10 can be smoothly streamlined from the upper side to the lower side. Further, since the radiator 12 is located below the engine 7, the center of gravity of the vehicle body is lowered, and since the width of the lower end of the radiator 12 is small, a sufficient bank angle can be obtained.

Further, since the space between the intake system means 14 and the fairing 10 can be sufficiently formed, when the vehicle starts traveling, a part of the traveling wind flowing in the longitudinal direction of the vehicle body is fairing.
From the opening for rotation of the front fork 4 provided on the engine 10 to the engine 7
Side, and the intake system means 14 is sufficiently flowed down to cool the engine 7. Further, a part of the traveling wind that has passed through the side of the front wheel 3 is clearly separated from the traveling wind that cools the engine, and is introduced from the intake port 10 a provided in the fairing 10 to the radiator 12.
The engine cooling water therein is cooled by passing through the radiator 12 and then to the rear of the vehicle body from the open rear portion of the fairing 10 through both side surfaces of the rear wheel 5.
Since the traveling wind passing through the radiator 12 is drawn into the negative pressure generated between the engine and the ground, the warm traveling wind passing through the radiator 12 is not sucked into the intake system means 14 or the like. In the above embodiment, the radiator
Reference numeral 12 is attached so as to be inclined with respect to the flow direction of the traveling wind, but it is desirable to arrange it at right angles to the traveling wind as much as possible if the lower surface of the crankcase 7a has a margin.

[Advantages of the Invention] In the water-cooled multi-cylinder engine device for a motorcycle according to the present invention, since the intake system means arranged on the left and right of the vehicle body are within the left and right width of the upper end of the radiator, the fairing is brought close to the left and right side surfaces of the radiator. However, a sufficient gap can be formed between the intake system means and the fairing, and a part of the traveling wind in the vehicle front-rear direction flows in smoothly from the opening for rotation of the front fork, and the intake efficiency of the intake system means is improved. At the same time, the engine is cooled by the running wind and the cooling efficiency of the engine is improved. In addition, since the intake system means was installed in the front part of the engine located above the radiator and the radiator cooling air intake was formed in the front of the fairing, the running wind that flowed in from the cooling air intake and passed through the radiator was installed. Is drawn into the negative pressure generated between the engine and the ground, so the warm running wind that has passed through the radiator is not sucked into the intake system means, etc., and the running wind cools the engine and the engine cooling water. The cooling is performed in a clearly divided manner, and the cooling efficiency can be sufficiently improved without affecting each other. Furthermore, since the intake system means is exposed within the left and right width of the upper end of the radiator and the width of the lower end of the radiator is smaller than the upper end, the outer shape of the fairing is a smooth streamline from the upper side to the lower side, and the aerodynamic resistance against the running wind. Can be reduced. Furthermore, since the radiator is located below the engine, the center of gravity of the vehicle body is lowered and the stability of the vehicle is maintained, but the bank degree could not be increased, but in this invention the width of the lower end of the radiator is reduced. Since a sufficient bank angle can be secured, it is possible to drive with a large inclination angle when cornering the vehicle.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle for competition to which the present invention is applied,
FIG. 2 is a front view thereof, FIG. 3 is a side view of a main part of a cross section of the fairing, and FIG. 4 is a front view thereof. 1 …… Motorcycle 2 …… Body frame 4 …… Front fork 7 …… Water-cooled multi-cylinder engine 10 …… Fairing 10a …… Ragetor cooling air intake 10d …… Running wind duct 12 …… Ragetor 14 …… Intake system means.

Claims (1)

(57) [Claims] 1. A fairing which covers a side and a front side of the engine in a motorcycle in which a radiator for heat exchange of cooling water of a water-cooled multi-cylinder engine mounted on a vehicle body frame is positioned below the water-cooled multi-cylinder engine. A front fork turning opening and a radiator cooling air intake are formed on the front surface of the fairing, and a traveling air duct protruding from the cooling air intake toward the radiator is formed integrally with the fairing. The width of the lower end of the radiator is made smaller than the width of the upper end, and an intake system means such as a carburetor is provided at the front part of the water-cooled multi-cylinder engine located above the radiator within the lateral width of the upper end of the radiator. A water-cooled multi-cylinder engine device for a motorcycle, which is disposed on the left and right sides, and the front end of the intake system means faces the front of the vehicle from the radiator.