JPH03287479A - Radiator arranging structure for motorcycle - Google Patents

Abstract

PURPOSE:To improve the cooling effect of a radiator by the running wind by dividing the radiator arranged between a vehicle body frame and a front wheel into the right and the left, locating them on both sides of a swing arm, and arranging them along the steering locus of the rear face of the front wheel in the plan view. CONSTITUTION:A radiator 28 arranged between a vehicle body frame 2 and a front wheel 4 is divided into the right and the left, and the right and left split radiators 28a, 28a are located on both sides of an upper arm 18 provided nearly at the center in the width direction of the vehicle body frame 2. The running winds 30 divided to the right and left from the front of an engine 7 and flowing backward effectively pass the split radiators 28a, 28a. The split radiators 28a, 28a are arranged along the steering locus 29 of the rear face of the front wheel 4, thus the running winds 30 pass the split radiators 28a, 28a nearly perpendicularly to them, and the cooling effect of the radiator 28 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the construction of a radiator installation tank in a motorcycle equipped with a swing arm type front wheel suspension system.

(Prior art) Conventionally, for motorcycles, for example, Japanese Patent Application Laid-Open No. 62-1949
There is one shown in Publication No. 87.

According to this, the engine is attached to the body frame of the motorcycle approximately at the center in the width direction. In addition, the front wheel suspension system is of a swing arm type, that is, it is provided with a swing arm that extends in the front-rear direction, and the rear part of this swing arm is pivoted to the front part of the vehicle body frame so as to be able to swing vertically. The steering knuckle for the front wheels is supported at the front of the vehicle. When the front wheels receive an impact while the vehicle is running, the swing arm swings up and down to absorb the impact.

Further, a radiator is disposed approximately in the widthwise center of the vehicle body frame between the vehicle body frame and the front wheels, and this radiator is located in front of the engine.

(Problems to be Solved by the Invention) By the way, when a motorcycle is running, the wind that has reached the front of the engine usually flows backward while being divided into left and right sides to avoid the engine. For this reason, when the radiator is installed in front of the engine as in the conventional configuration, the running air is obstructed by the engine and passes mainly through the sides of the radiator, avoiding the center of the radiator. As a result, there is an inconvenience that a cooling effect corresponding to the cooling capacity of this radiator cannot be obtained.

In addition, in the above configuration, the radiator is provided in the space between the vehicle body frame and the front wheels at approximately the center in the width direction of the vehicle body frame. It is a narrow space sandwiched between the most rearward projecting part and the vehicle body frame, that is, the part with the shortest front-rear dimension between the vehicle body frame and the front wheels. For this reason, if a radiator is placed in the above space, it will be restricted from bringing the front wheels closer to the vehicle frame.
In other words, the above configuration has the disadvantage that the wheelbase cannot be shortened.

(Objective of the Invention) The present invention was made in view of the above-mentioned circumstances, and aims to improve the cooling effect of the five radiators and shorten the path to the wheel.

(Structure of the Invention) A feature of the present invention for achieving the above object is that the radiator disposed between the vehicle body frame and the front wheel is divided into left and right parts, and these left and right divided radiators are arranged on both sides of the swing arm. In addition, each of these divided radiators is arranged along the steering locus of the rear surface of the front wheels when viewed from above.

(Function) The function of the above structure is as follows.6 Body frame 2
When the engine 7 is mounted approximately at the center in the width direction of the motorcycle 1, when the motorcycle 1 is running, the traveling wind 30 that has reached the front of the body frame 2 is then divided to the left and right to avoid the engine 7 and is directed rearward. It will flow.

Therefore, in the present invention, the radiator 28 disposed between the vehicle body frame 2 and the front wheel 4 is divided into left and right parts, and these left and right divided radiators 28a, 28a are provided approximately at the center of the vehicle body frame 2 in the width direction. swing arm) 1B. Therefore, as described above, each traveling wind 30 flowing rearward from the front of the engine 7 while being divided into right and left sides is connected to each of the divided radiators 28a.

28a.

Furthermore, each of the divided radiators 28a, 28a is arranged along the steering locus 29 of the rear surface of the front wheels 4 in plan view. For this reason, each of the divided radiators 28a, 28a is in a position facing diagonally forward toward the center of the vehicle body. On the other hand, since the traveling wind 30 flows backward from the front of the engine 7 while being divided into left and right sides as described above, this traveling wind 30 passes through each of the divided radiators 28a, 28a almost orthogonally. I will do it.

Further, approximately the center in the width direction of the vehicle body frame 2 is a space 31 having the shortest longitudinal dimension between the vehicle body frame 2 and the front wheels 4, and as described above, each of the divided radiators 28a,
28a are provided on both sides of the upper arm (swing arm) 18, and are not provided in the space 31. Therefore, since the radiator 28 is not provided in this narrow space 31, the front wheels 4 can be brought closer to the vehicle body frame 2, that is, the wheelbase can be shortened.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, l is a motorcycle, 2 is a body frame, a front wheel suspension device 3 is attached to the front part of this body frame 2, and a front wheel 4 is attached to this front wheel suspension device 3 so that it can be freely steered. Supported.

Further, above the front wheel suspension system 3, a handle 5 is supported by the vehicle body frame 2. Further, a parallel multi-cylinder engine 7 is installed approximately at the center of the vehicle body frame 2 in the width direction. Additionally, 8 is a fuel tank.

The vehicle body frame 2 has a pair of left and right main frames 10.10.
The front portions of these left and right main frames 10.10 are firmly and removably connected to each other by a cross member 9 and a port 9a. Further, a steering frame 11 having a triangular shape in side view removably protrudes forward and upward from the front part of the main frame 10, and a head vibrator 12 is attached to the protruding end of the steering frame 11. is supported.

The front suspension system 3 is of a so-called double wishbone type and has a steering knuckle 14, on the lower end of which the front wheel 4 is supported. On the other hand, 15 is a lower arm, and this lower arm 15 is composed of a main arm 15a extending in the front-rear direction on the left side of the front wheel 4, and a sub-arm 15b that extends to the right side from the front-rear midway point of this main arm 15a and then bends rearward. It is configured. The rear ends of the main arm 15a and the sub-arm 15b are removably pivoted to the cross member 9 by pivot shafts 16, and the front part of the main arm 15a is moved up and down about these pivot shafts 16. It is said to be able to swing freely. Further, the lower end of the steering knuckle 14 is pivotally supported by a lower ball joint 17 at the front swinging end of the main arm 15a.

At the front upper part of the main frame 10, IO, an upper arm 18, which is a swing arm whose rear part opens rearward in a bifurcated shape, is pivoted to be vertically swingable by a pair of left and right pivot shafts 19 and 19. At the front swing end of the upper arm 18,
The upper end of the steering knuckle 14 is pivotally supported by an upper ball joint 20. In other words, the lower arm 15 and the upper arm 18 constitute a parallel link, which connects the steering knuckle 14 to the main frame 10.
．． 10 so as to be vertically swingable. The steering knuckle 14 can be steered together with the front wheels 4 about the axis connecting the lower ball joint 17 and the upper pole joint 20, that is, about the steering axis.

A shock absorber 22 is installed between the front upper part of the main frame 10 and the lower arm 15, and this shock absorber 22 holds the lower arm 15 in a predetermined posture, that is, the steering knuckle 14 in a predetermined posture, and also holds the lower arm 15 in a predetermined posture. , absorbs the impact that is about to be transmitted from the front part 4 to the vehicle body frame 2 side.

A telescopic interlocking means 24 is interposed between the steering knuckle 14 and the handle 5. This interlocking means 24 is composed of a pair of sliding shafts 25.25 attached to the lower end of the steering wheel 5 and a case 26 attached to the upper end of the steering knuckle 14. It is slidably inserted into the

When the steering wheel 5 is operated, the front wheels 4 are steered around the steering axis via the interlocking means 24 and the steering knuckle 14. Furthermore, when the steering knuckle 14 swings up and down, such as when driving, the sliding wheels 25, 25 and the case 26 slide relative to each other, causing the steering knuckle 14 and the handle 5 to slide relative to each other.
Changes in relative vertical position are absorbed.

Note that springs are interposed between the steering knuckle 14 and the case 26, and between the handle 5 and each sliding shaft 25°25, and these springs are connected to the steering knuckle 14, the handle 5, and the sliding shafts 25, 25, respectively. Interlocking means 2
It absorbs the change in relative slope of 4.

A radiator 28 is disposed between the vehicle body frame 2 and the front wheels 4. This radiator 28 is divided into left and right parts to form a pair of divided radiators 28a.

28a. These divided radiators 28a
, 28a are positioned symmetrically on both sides of the upper arm 18. In addition, each of these divided radiators 2
As shown in FIG. 1, 8a is provided along the steering locus 29 of the rear surface of the front wheels 4 in plan view. Furthermore, when the front wheel 4 swings up and down as shown by the solid line and the temporary line in FIG.
The rocking trajectory of the front and rear surfaces of the front and rear surfaces is substantially vertical, and each of the divided radiators 28a is also provided substantially vertically along this trajectory.

By the way, when the motorcycle 1 is running, the running wind 30 that has reached the front of the vehicle body frame 2 then flows rearward while being divided into left and right sides to avoid the engine 7.

In the above case, as described above, the radiator 28 disposed between the vehicle body frame 2 and the front wheels 4 is divided into left and right parts, and these left and right divided radiators 28a, 28a are located approximately at the center of the vehicle body frame 2 in the width direction. Upper arm 1 provided
It is located on both sides of 8. Therefore, as described above, each of the traveling winds 30 flowing rearward from the front of the engine 7 while being divided into right and left sides effectively passes through each of the divided radiators 28a, 28a.

Moreover, each of the divided radiators 28a, 28a is connected to the front wheel 4.
Because it is arranged along the steering trajectory 29 on the rear surface,
Each of the divided radiators 28a, 28a is oriented diagonally forward toward the center of the vehicle body. On the other hand, since the running wind 30 flows backward from the front of the engine 7 while being divided into left and right sides as described above, this running wind 3
0 passes approximately orthogonally to each of the divided radiators 28a, 28a. Further, as described above, since the radiator 28 is approximately vertical, the traveling wind 30 passes through each divided radiator 28a almost perpendicularly even when viewed from the side, thereby increasing the cooling effect of the radiator 28. ing.

Further, approximately at the center in the width direction of the vehicle body frame 2 is a space 31 having the shortest longitudinal dimension between the vehicle body frame 2 and the front wheels 4. Since the radiator 28 is not provided in this space 31, the front wheel 4 is moved closer to the vehicle body frame 2, thereby shortening the wheelbase.

FIG. 4 shows a second embodiment.

According to this, the upper arm 18 is divided into two parts from the front part toward the rear, and the rear ends of these two parts are firmly connected by the connecting vibe 33.

Other configurations and operations are similar to those of the previous embodiment.

Therefore, common configurations will be designated by reference numerals in the drawings and their explanation will be omitted.

(Effects of the Invention) According to this invention, the radiator is divided into left and right parts, and these left and right divided radiators are located on both sides of the swing arm, so that each running wind that flows backward from the front of the engine is divided into left and right parts. It effectively passes through each of the above-mentioned divided radiators. Therefore, the cooling effect of the radiator is enhanced.

Moreover, since each of the divided radiators is arranged along the steering locus of the rear surface of the front wheels in a plan view, each of the divided radiators faces obliquely forward toward the center of the vehicle body. On the other hand, since the traveling wind flows backward from the front of the engine while being divided into right and left sides as described above, this traveling wind passes through each of the divided radiators almost perpendicularly to the divided radiators. Therefore, in this respect as well,
The cooling effect of the radiator is enhanced.

Furthermore, approximately the center in the width direction of the vehicle body frame is the space between the vehicle body frame and the front wheel where the front and rear dimensions are the shortest, but as mentioned above, each divided radiator is provided on both sides of the swing arm, It is not provided in the above space. Therefore, since a radiator is not installed in this narrow space, the front wheels can be brought closer to the vehicle frame.
It has the advantage of being able to shorten the wheelbase.

(Margin below)

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a plan view of a front wheel suspension system, Fig. 2 is a side view of the front part of the motorcycle, Fig. 3 is a simplified perspective view of the front part of the same motorcycle, and Fig. 4 is a plan view of the front wheel suspension system. is another embodiment and is a diagram corresponding to FIG. 1. l...Motorcycle, 2...Body frame, 3...Front wheel suspension, 4...Front wheel, 7...Engine, 14...Steering knuckle, 15...Lower arm, 18...Upper arm (swing arm), 28 ...Rajeta, 28
a...Divided radiator, 29...Steering trajectory, 30...Driving wind, 31...Space. Figure 3

Claims (1)

[Claims] 1. The engine is mounted approximately at the center of the vehicle body frame in the width direction, and a swing arm is provided approximately at the center of the vehicle body frame in the width direction and extends in the longitudinal direction, and the rear portion of the swing arm is pivoted to the front portion of the vehicle body frame so as to be vertically swingable. On the other hand, in a radiator arrangement structure for a motorcycle, in which a steering knuckle for a front wheel is supported at the front part of the swing arm, and a radiator is arranged between the body frame and the front wheel,
A radiator arrangement for a motorcycle in which the above-mentioned radiator is divided into left and right parts, these left and right divided radiators are located on both sides of the swing arm, and each of these divided radiators is arranged so as to follow the steering trajectory of the rear surface of the front wheel when viewed from above. structure.