JPS60226325A - Engine cooling device in motorcycle - Google Patents

Abstract

PURPOSE:To obtain such a condition that cooling air having passed through a radiator does not affect a carburettor and ram air is directly affected upon the carburettor which is therefore prevented from being heated, by biasing the carburettor to one side from the crosswise center line of the vehicle while arranging the radiator on the other side. CONSTITUTION:A vehicle body frame 2 attached thereto with an engine 3 has a main column 2b extending rearward from a steering shaft pipe 2a at the front end of the vehicle body frame 2 and supporting the rear section of the engine 3, and down tubes 2c extending downward. An air purifier 10 is attached one of the down tubes 2c and a radiator 14 is attached to the other one. The radiator 14 and the air purifier 10 are jaxtaposed at the front surface of the vehicle body frame 2. Further, carburettors 12, 13 are disposed in front and rear intake-air pipes 7, respectively. When the vehicle runs, ram air affects the radiator 14, but since the carburettors 12, 13 are positioned outside of the stream of cooling air which is heated by the radiator 14, the carburettors are prevented from being heated.

Description

[Detailed description of the invention] [Technical field and purpose of the invention] This invention relates to a motorcycle equipped with a V-shaped or horizontally opposed water-cooled engine having a pair of front and rear cylinders extending in the direction, and in particular, a motorcycle equipped in front of the engine. The purpose of this is to prevent the carburetor from overheating due to the hot air passing through the radiator.

[Prior art]

Conventionally, a motorcycle in which at least one pair of cylinders extending from the crankcase in the front-rear direction of the vehicle is arranged in an opposed manner has already been proposed by the applicant (for example, Japanese Patent Laid-Open No. 58-22481), It has also been proposed to install a radiator in a down tube located in front of the crankcase of the vehicle body frame.

On the other hand, in a horizontally opposed engine or a ■-shaped engine with a large bank angle, the carburetor is installed directly above the crankcase, that is, in the width direction of the vehicle, so the radiator is installed in the downtube as in the past. Then, it passed through the radiator and the heat JJ-L J-1 No. 1 was released. kr m -A, tsuτ article body - also - toss n1η
1. If the radiator and vaporizer are close to each other, the vaporizer may overheat and cause problems such as percolation.

[Summary of the invention]

The present invention has been made to solve the above-mentioned problems, and is intended to provide a motorcycle equipped with a liquid-cooled engine having at least two cylinders extending from the crankcase in the longitudinal direction of the vehicle body. The present invention is characterized in that at least one carburetor connected to the cylinder is provided offset to one side of the left-right center line of the vehicle body, and a radiator is installed on the other side.

〔Example〕

Hereinafter, this invention will be explained with reference to illustrated embodiments.
is a motorcycle, and a horizontally opposed engine 3 is mounted on a body frame 2 of the motorcycle, with the axis of the cylinder oriented in the direction of travel of the vehicle. The body frame 2 has a main column 2b that extends rearward from a steering shaft tube 2a at the front end and supports the rear part of the engine 3, and a down tube 2C that extends downward and supports the front part of the engine 3. The lower ends of the down tube 2C and the down tube 2C are connected by a tube member 2d in the front-rear direction, forming a so-called cradle shape. 4 is a steering shaft pipe 2a via a front fork 4a.
5 is the front wheel supported by , and 5 is the rear wheel.

The engine 3 is mounted on a bracket h bolted to the body frame 2.
It is a horizontally opposed water-cooled type cylinder that is attached to the vehicle body frame 2 by 3m and 3bK and has a front cylinder 6m extending forward from the central crankcase 6 and a rear cylinder 6b extending rearward. An intake pipe 7 extending downward from above is connected to the cylinder head portion of each cylinder 6a16b, and an exhaust pipe 8 extending downward is connected to the lower surface thereof. The upstream end of each intake pipe 7 is connected to an air purifier 1 provided on the lower surface of the fuel tank 9.
It opens within 0.11. 12 is a carburetor installed in the front intake pipe 7, and 13 is a carburetor installed in the rear intake pipe 7.

As shown in FIG. 2, the front air cleaner 10 has two down tubes 2 extending downward from the left and right sides of the steering shaft tube 2a.
A radiator 14 for cooling engine cooling water is attached to the other descending pipe 2C. 1
5 is an electric fan arranged behind the radiator 14, and 16 is a storage battery. Thus, the radiator 14 and the front air cleaner 10 are provided side by side on the front of the vehicle body frame 2.

Next, the behavior of the running wind in this motorcycle will be explained. When the engine 3 is started and the vehicle is running, the running wind acts on the radiator 14 from the front side, and as it passes there, it cools the refrigerant flowing through the radiator 14, but the running wind heated by the refrigerant flows backward. Flow. At this time,
The front vaporizer 12 and the rear vaporizer 13 are placed outside the heated cooling air flow path and are not heated.

The wind flowing on the other side of the vehicle enters the front air cleaner 10 installed adjacent to the radiator 14, removes dust, and then mixes fuel into the carburetor 12.13 to form a mixture. , is inhaled into the engine 3.

〔Effect of the invention〕

As described above, the present invention provides a motorcycle equipped with a liquid-cooled engine having at least two cylinders extending from the crankcase in the longitudinal direction of the vehicle body on the body frame.
At least one of the carburetors connected to the front and rear cylinders is installed offset to one side of the car body's left-right center line, and the radiator is installed on the other side, so the radiator is located in front of the carburetor. Even though the radiator is installed, the cooling air that has passed through the radiator does not act on the carburetor; instead, the running wind acts directly on the carburetor, which prevents the carburetor from overheating. be.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a side view of the motorcycle, FIG. 2 is a front view of the front part of the vehicle body, and FIG. 3 is a plan view thereof. 2a...Φ・Steering axis tube, 2C...down tube,
fJa...front cylinder, 6b...fist/rear cylinder,
1G, 11...Air purifier, 12゜13...Carburizer, 14...-Radiator. Patent Applicant Yamaha Motor Co., Ltd. Agent Masaki Yamakawa (Two Idiots)

Claims (3)

[Claims] (1) In a motorcycle equipped with a liquid-cooled engine having at least two cylinders extending from the crankcase in the longitudinal direction of the vehicle body, at least one carburetor connected to the front and rear cylinders is located on the left or right side of the vehicle body. An engine cooling system for a motorcycle that is installed offset to one side of the left or right side with respect to a directional center line, and has a radiator installed on the other side. (2) The engine cooling system for a motorcycle according to claim 1, wherein the radiator is attached to a down tube that constitutes a vehicle body frame. (3) The engine cooling device for a motorcycle according to claim 1, wherein the cylinder is of a horizontally opposed type extending horizontally from the crankcase in the longitudinal direction.