JP2002127977A - Motorcycle mounted with water cooled-engine with balancer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motorcycle mounted with a water cooled-engine with a balancer capable of increasing a bank angle by properly arranging an engine, a radiator, a fan and an exhaust pipe, arranging the engine on the front side so as to approach a front axle and arranging cooling hoses and an oil hose on the inside. SOLUTION: The radiator 32 is arranged so as to form a substantially truncated chevron shape relative to a cylinder 28 inclined forward in a side view. A cooling fan 35 of the radiator 31 is arranged within a space 36 among three of the radiator 31, the engine 8 and the exhaust pipe 30. Each hose 37 from the radiator 31 and an oil cooler 33 is disposed so as to be continues to the lower side of an engine case 32. The exhaust pipe 30 is arranged in front of the engine cylinder 28, passing between the oil cooler 33 arranged on the lower side of the radiator 31 and a storing chamber 39 of a balancer mechanism 34 arranged in front of an engine case 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-cooled engine equipped with a radiator for a water-cooled engine, an oil cooler, and an engine having a balancer mechanism positioned between front wheels and rear wheels and suspended on a body frame. Related to motorcycles.

[0002]

2. Description of the Related Art In a motorcycle equipped with a forward leaning engine, particularly a parallel multi-cylinder forward leaning engine, an exhaust pipe (exhaust pipe) is usually connected to an engine front exhaust port and extends downward therefrom. Motorcycles need to mount the engine as compactly as possible where there is a restriction on the overall length, so the front wheels may be approaching the engine. For this reason, the exhaust pipe bends almost downward immediately from the exhaust port of the engine cylinder head, extends downward substantially parallel to the engine cylinder, and turns downward from the front of the engine case.

In a water-cooled engine, a radiator for water cooling is arranged behind a front axle and in front of an exhaust pipe in order to keep the radiator for water cooling within a projected area of the vehicle when viewed from the front so as to avoid resistance due to traveling wind.

[0004]

However, when a radiator and an oil cooler are arranged in an engine in a motorcycle, the radiator fan is large and interferes with an exhaust pipe, so that it is difficult to shorten a distance between the engine and a front axle. The load on the front wheels could not be secured. Also, it was difficult to reduce the front and rear length of the vehicle body.

Further, an engine having a balancer mechanism in the engine, in which a balancer shaft is arranged at the front of the engine case (see, for example, Japanese Utility Model Laid-Open No. 2-141615).
In this case, the oil hose and the water hose are arranged outside the balancer chamber, and the lower part of the cowling is expanded, so that there is a problem that the vehicle body performance is affected when a bank angle cannot be secured or a front projection area increases. Further, Japanese Patent Application Laid-Open No.
In the motorcycle disclosed in Japanese Patent No. 31962, there is a motorcycle in which a radiator and an oil cooler are arranged on the front side of an engine and a balancer is arranged on a lower side of the engine. Affects turning performance.

[0006] In motorcycles, it is better to arrange heavy objects as concentrated as possible by using the empty space, so that the empty space can be effectively used and mass concentration can be achieved. Concentration was not considered much. In particular, in the case of a motorcycle with a cowling, the width of the cowling is likely to increase unless piping for the front wheels, cowling, and cooling hoses is taken into consideration, and it is necessary to secure a gap between the exhaust pipe and the hoses. Arose,
It was difficult to squeeze the lower part of the cowling.

[0007] The present invention has been proposed in view of the above-described circumstances, and is directed to an engine having a balancer mechanism accommodating chamber formed so as to protrude forward at the front of an engine case.
By properly arranging the engine, radiator, fan and exhaust pipe, the engine can be placed on the front side closer to the front axle so that the load can be applied to the front side,
It is another object of the present invention to provide a motorcycle equipped with a water-cooled engine with a balancer that can increase a bank angle by disposing a water hose and an oil hose inside.

[0008]

The present invention has the following features in order to achieve the above-mentioned object. That is, the present invention is directed to a water-cooled engine, wherein an exhaust pipe connected to an exhaust port at the front of the engine cylinder extends downward on the front side of the engine cylinder, passes through the lower side of the engine case, and then extends rearward of the engine case. In a motorcycle in which an engine having a radiator, an oil cooler, and a balancer mechanism is positioned between front wheels and rear wheels and suspended on a body frame, an engine cylinder erected on an engine case leans forward, A radiator arranged in front of the engine cylinder is arranged so as to form a substantially c-shape with the cylinder and the lower opening when viewed from the side of the vehicle body,
The cooling fan of the radiator is disposed in a space between the radiator body, the engine, and the exhaust pipe,
A water hose extending downward from the radiator and an oil hose extending downward from an oil cooler located below the radiator are respectively connected to a lower part of an engine case, and the exhaust pipe is directed forward to the oil cooler and a front part of the engine case. A motorcycle equipped with a water-cooled engine with a balancer, which is arranged so as to pass between the projecting balancer accommodation chamber.

According to the present invention, the cooling fan is disposed in an empty space by disposing the cooling fan in the space between the engine, the radiator, and the exhaust pipe.
Since the radiator and the engine do not interfere with each other and the distance between them can be reduced, the radiator and the engine can be brought closer to the front wheels. Further, the cushion stroke of the front wheel can be secured. Therefore, the distance from the engine to the front axle can be shortened, and the engine can be arranged closer to the front of the vehicle body, so that the load on the front wheels can be secured.

In the present invention, the motorcycle is equipped with a parallel multi-cylinder engine and a cowling for covering the vehicle body and the engine from the outside. The cowling accommodates a balancer mechanism. It is preferable that a water hose and an oil hose are arranged on the side of the room in the vehicle width direction. With this configuration, the water hose and the oil hose can be arranged by utilizing the empty space on the side of the balancer housing chamber, and can be arranged to be driven into the left and right vehicle widths. Therefore, the lower part of the cowling can be squeezed without protruding outward, the bank angle of the vehicle body can be secured, and the front projection area can be reduced.

Further, in the present invention, a water hose and an oil hose are provided in front of the engine case and beside the balancer mechanism housing chamber, and an exhaust pipe is provided between the front face of the balancer housing chamber and the oil cooler. Preferably. According to this structure, a compact arrangement can be achieved by utilizing the dead space in front of the engine case and on the sides of the storage chamber and between the oil cooler and the storage chamber, and the exhaust pipe that dissipates heat and the oil hose that dislikes heat are provided. And the water hose can be secured to eliminate the influence of heat from the exhaust pipe on those hoses. Further, the exhaust pipe is arranged on the rear side of the oil cooler, so that the heat of the exhaust pipe does not affect the oil cooler due to the traveling wind, so that the cooling performance of the oil cooler can be secured. Furthermore, the oil cooler and the balancer are arranged on the lower side of the engine, so that the center of gravity can be reduced and the mass can be concentrated.

In the present invention, a water hose, an oil hose, and an exhaust pipe are provided inside a line connecting one end of the oil cooler and the engine case in the vehicle width direction in a plan view. Preferably, it is provided.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the following description, the terms “front”, “up”, “down”, “left” and “right” are relative to the traveling direction of the vehicle, and the right and left are the same as the vehicle width direction.

FIG. 1 is an overall side view of a motorcycle according to an embodiment, FIG. 2 is an enlarged side view of an engine and its surroundings, and FIG. 3 is a cross-sectional view taken along line III-III of FIG.

Referring to FIG. 1, a motorcycle 1 includes a pair of left and right front forks 3 rotatably supported by a frame 2 and a head pipe 11 at a front end of the frame 2.
A handle 4 attached to the upper end of the front fork 3; a front wheel 5 supported at the lower end of the front fork 3; a pair of left and right rear forks 6 supported at the center of the frame 2 and extending rearward; Is located between the front wheel 5 and the rear wheel 7 supported by the rear end of the vehicle (for example, the engine crankshaft is located forward of the intermediate position between the front wheel 6 axis and the rear wheel 7 axis). It has a water-cooled engine 8 supported and suspended on the frame 2, a fuel tank 9 and a seat 10 installed on the upper part of the frame 2.

The frame 2 includes a head pipe 1 at a front end.
A main frame 12 having a U-shape in plan view extending from the left and right pairs near the left and right width of the vehicle body and extending rearward and downward toward the rear, and upper and lower portions fixed to the rear end of the main frame 12 It is a twin tube type having a pair of left and right side frames 14 extending downward and a seat rail 15 extending rearward from an upper portion of the side frames 14. Each part of the frame 2 is fixed by welding, and the main frame 12 and the side frame 14 have a substantially L-shape or T-shape in a side view. The front fork 3 is an inverted type in which an inner tube is incorporated in an outer tube in which a suspension is incorporated and cushions, and the front wheel 3 is rotatably supported via an axle 16 at a lower end of the inner tube. It is a front wheel suspension mechanism. A disc brake caliper 17 for braking the front wheel 5 is provided at the lower end of the inner tube of the front fork 3, and a brake disc 18 fixed to the front wheel 5 hub is pressed by the brake pad of the caliper 17 so that the front wheel 5 is pressed. It is designed to brake. Also, a front fender 1 that covers the upper part of the front wheel 5
9 is fixed to the lower end of the front fork 3 and moves up and down simultaneously with the cushion of the front wheel 5.

The rear fork 6 has a pivot 20 at the front end of the side frame 14 at the center in the vertical direction (substantially at the middle between the lower end of the side frame and the vicinity of the joint of the main frame 12). And is supported by a cushion unit (not shown) located in front of the rear wheel 7 so as to be able to move up and down freely. At the rear end of the rear fork 6, the rear wheel 7 is rotatably supported via an axle 21. A driven chain sprocket 22 fixed to a rear wheel 7 hub and a drive chain sprocket on the side of the water-cooled engine 8 are provided. A chain 23 is wound around the rocket.

The fuel tank 9 is mounted on the main frame 12 and fixed, and has a shape in which a lower surface portion is depressed and has a roughly egg-like shape, and a cylinder head 24 and an air An intake device such as a cleaner is accommodated.

The seat 10 has a driver in front of it.
A passenger sits on the rear part, and is detachably provided above the seat rail 15. The front portion of the seat 10 is lower than the rear portion to improve the rider's feet. A step 25 for the rider is provided on the side frame 14 near the rear of the pivot 20, and a step 26 for the passenger is provided below the seat rail 15 and above the rear wheel. A side stand 27 is provided at a lower end of the side frame 14.

Here, the water-cooled engine 8 of the embodiment is a DOHC type multi-cylinder engine in which a cam shaft in a cylinder head 24 is driven by a cam chain (not shown), as shown in detail in FIG. An exhaust pipe 30 connected to an exhaust port 29 which faces obliquely downward and forward of the front portion (lower part of the cylinder head) of the engine cylinder 28 extends forward and obliquely downward, turns downward and obliquely backward near the radiator 31, and further extends downward. Extended engine case 3
2 and extends to the rear side of the engine case 32 after passing under the engine case 32.

The water-cooled engine 8 includes a water-cooled engine 8
Radiator 31, an oil cooler 33, and a balancer mechanism 34 are arranged on the front side of the engine. Further, the engine cylinder 28 is arranged to be inclined forward with respect to the engine case 32 (the cylinder center axis is inclined forward with respect to the crankshaft). Radiator 31
Is disposed at an angle smaller than the forward tilt angle of the engine cylinder 28 (at least stands upward from the cylinder), and the plane direction of the radiator 31 in the vehicle body side view is set to On the other hand, they are arranged so as to form a substantially open bottom shape.

The electric cooling fan 3 of the radiator 31
5 is disposed in a space 36 between the radiator 31 main body 31a, the engine 8 and the exhaust pipe 30, and extends from the radiator 31 and the oil cooler 33 to a required portion below the engine case 32 (the water pump 4).
A water hose 37 and an oil hose 38 so as to be connected to the oil cooler 3 and the oil pump or the engine case 32, the engine cylinder 28, etc., respectively.
An exhaust pipe 30 is arranged in front of the engine cylinder 28 so as to pass between the housing 3 and the accommodation chamber 39 of the balancer mechanism 34 protrudingly arranged (almost in front of the crankshaft) at the front of the engine case 32.

A water pump 40 is disposed on one side (left side) of the rear lower part of the engine case 32 crankshaft, and a hose 37 connected to the lower part of the radiator 31 passes by one side of the balancer housing chamber 39. The water pump 40 is provided. A drive chain sprocket 45 is provided on the rear side of the engine case.

In the embodiment, by arranging the water-cooled engine 8, the radiator 31, and the fan 35 as described above, the fan 35 can be accommodated in the empty space 36, and the radiator 31 and the engine 8 are not interfered with each other. The distance between the radiator 31 and the engine 8 can be reduced to the full cushion stroke of the front wheels 5.
Therefore, the distance from the engine 8 to the front axle can be reduced to near the limit. That is, the front wheel load can be ensured by allowing the engine 8 to be disposed closer to the front of the vehicle body.

The motorcycle is equipped with a parallel multi-cylinder water-cooled engine. A cylinder head 24 of the engine overlaps with the main frame 12 in a side view, and the vehicle body such as the frame 2 and the engine 8 are externally mounted. A covering cowling 41 is provided in front of the handlebar 4, from above the front wheel 5, substantially covering the upper part of the front fork 3, covering the engine 8, and the lower part extends to near the rear wheel 7. As can be seen, in the cowling 41, a water hose 37 and an oil hose 38 are arranged on the lateral side of the balancer mechanism housing chamber 39 in the vehicle width direction (the left side in the embodiment). By doing so, the water hose 37
The oil hose 38 and the oil hose 38 can be arranged by utilizing the empty space on the side of the balancer housing chamber 39, and can be arranged so as to be driven into the left and right vehicle widths. Therefore, the lower part of the cowling 41 can be squeezed without protruding to the outside, the vehicle body bank angle can be secured, and the front projection area can be reduced.

A water hose 37 and an oil hose 38 are provided in front of the engine case 32 and beside the balancer mechanism housing chamber 39, and the balancer housing chamber 3
An exhaust pipe 30 is provided between the front surface 9 and the oil cooler 33. Because of this, the engine case 32
By utilizing the dead space in front and on the side of the storage chamber 39 and between the oil cooler 32 and the storage chamber 39, a compact arrangement can be achieved, and the exhaust pipe 30 for dissipating heat, the oil hose 38 which dislikes heat, and the water hose By ensuring the space between the exhaust pipe 30 and the hoses 37, 37, the influence of heat from the exhaust pipe 30 on the hoses 38, 37 can be eliminated. Further, the cooling performance of the oil cooler 33 can be ensured by disposing the exhaust pipe 30 behind the oil cooler 33 so that the heat of the exhaust pipe 30 does not affect the oil cooler 33 due to the traveling wind. Furthermore, the oil cooler 33 and the balancer 34 are arranged at the lower side of the engine 8 so that the center of gravity can be reduced and the mass can be concentrated. Thereby, the steering stability can be improved.

As shown in FIG. 3, a water hose 37 is provided inward along a line 44 connecting the oil cooler 33 and the engine case 32 to one end in the vehicle width direction in a plan view. An oil hose 38 and an exhaust pipe 30 are provided. Thus, the water hose 37, the oil hose 38, and the exhaust pipe 30 can be accommodated without having to make the lower portion of the engine cowling 41 wide.

[0028]

According to the present invention, since the water-cooled engine, the radiator, and the fan are arranged as described above, the fan can be accommodated in an empty space, and the radiator and the engine do not interfere with each other. , So you can bring the radiator engine closer to the front wheels,
The distance from the engine to the front axle can be reduced. In other words, the front wheel load can be ensured by allowing the engine to be disposed closer to the front of the vehicle body.

Therefore, the water-cooled engine, the radiator, the fan, and the exhaust pipe are appropriately arranged so that the water-cooled engine can be arranged on the front side so as to approach the front axle so that the load is applied to the front side. It is possible to provide a motorcycle equipped with a water-cooled engine with a balancer that can increase the bank angle by disposing an oil hose inside.

[Brief description of the drawings]

FIG. 1 is an overall side view of a motorcycle on which a water-cooled engine with a balancer is mounted according to an embodiment of the present invention.

FIG. 2 is an enlarged side view of the water-cooled engine of FIG. 1 and its surroundings.

FIG. 3 is a transverse sectional view taken along the line III-III of FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Frame 3 Front fork 4 Handle 5 Front wheel 6 Rear fork 7 Rear wheel 8 Water-cooled engine 9 Fuel tank 10 Seat 11 Head pipe 12 Main frame 14 Side frame 15 Seat rail 16 Front wheel axle 24 Cylinder head 28 Engine cylinder 29 Exhaust Mouth 30 Exhaust pipe 31 Water-cooled radiator 32 Engine case 33 Oil cooler 34 Balancer mechanism 35 Electric fan 36 Space 37 Water hose 38 Oil hose 39 Balancer mechanism accommodating chamber 40 Water pump 41 Cowling 44 One side in the vehicle width direction between oil cooler and engine case Line connecting the ends

Claims (4)

[Claims] An exhaust pipe connected to an exhaust port at a front portion of an engine cylinder extends downward at a front side of the engine cylinder, passes through a lower side of an engine case, and then extends rearward of the engine case. In a motorcycle in which an engine having a radiator, an oil cooler, and a balancer mechanism is positioned between a front wheel and a rear wheel and suspended on a body frame, an engine cylinder erected on an engine case leans forward, A radiator disposed at the front of the cylinder is disposed so as to form a substantially c-shape with the cylinder and a downward opening when viewed from the side of the vehicle body, and a cooling fan of the radiator is provided in a space between the radiator body, the engine, and the exhaust pipe. A water hose extending downward from the radiator and a water hose extending downwardly from the radiator. Oil hoses extending downward from an oil cooler to be placed are respectively connected to the lower part of the engine case, and the exhaust pipe passes between the oil cooler and a balancer mechanism accommodating chamber arranged to protrude forward at the front of the engine case. A motorcycle equipped with a water-cooled engine with a balancer, which is arranged as follows. 2. A motorcycle equipped with a parallel multi-cylinder water-cooled engine and a cowling for covering the vehicle body and the engine from outside, wherein the body of the balancer mechanism housing chamber is provided in the cowling. The motorcycle equipped with a water-cooled engine with a balancer according to claim 1, wherein a water hose and an oil hose are arranged laterally in the width direction. 3. A water hose and an oil hose are provided in front of the engine case and on the side of the balancer mechanism housing chamber, and an exhaust pipe is provided between the front face of the balancer housing chamber and the oil cooler. A motorcycle equipped with a water-cooled engine with a balancer according to claim 1 or 2. 4. A water hose, an oil hose, and an exhaust pipe are provided inside a line connecting one end in the vehicle width direction of the oil cooler and the engine case in a plan view. The motorcycle equipped with a water-cooled engine with a balancer according to any one of claims 1 to 3.