JPH03193585A - Motorcycle - Google Patents

Abstract

PURPOSE:To facilitate the injection of cooling water into a radiator as securing the rigidity of a frame by passing a pipeline, injecting cooling water into the radiator, through a guide cylinder pierced and clamped to a box type frame, and setting up a cooling water injecting part installed in this pipeline at the upside of this frame. CONSTITUTION:A box type frame 7 welded to a head pipe 2 is situated at the upper part of a radiator 44, and a guide cylinder 400 is pierced through in the axial direction of a head pipe and fixed to this frame 7 by means of welding. A pipeline 401 connected to an upper part of the radiator 44 is inserted into the guide cylinder 400, and then a cooling water injecting part 402 is set up at the upper side of the box frame 7. When a cap 403 of the cooling water injecting part 402 is removed, cooling water can be injected into the radiator 44 from the upside of the frame 7 via the pipeline 401, and the box type frame 7 is reinforced by the guide cylinder 400, thus the rigidity of the frame 7 is improved without using any special reinforced member.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application in Business A] The present invention relates to a motorcycle, and more particularly to a motorcycle that is optimal for traveling on rough terrain.

[Prior Art] In motorcycles that travel on rough terrain, long seats are used in the front and rear so that the rider can change the riding position back and forth depending on the riding conditions.

Such motorcycles use a main frame with a straight cross section, a fuel tank is arranged so as to straddle the single main frame connected to the head pipe, and a seat is attached to cover the fuel tank. Then, place the radiator behind the head pipe and below the main frame.
For example, a radiator cover is attached to cover both sides of the radiator. A flat part is formed that extends from the seat to the radiator cover via the fuel tank, allowing the rider to maintain his posture by holding this flat part with his feet.
It also ensures that it does not get in the way when you put your foot forward when turning a corner.

[Problems to be Solved by the Invention] By the way, it is conceivable to use a frame with a rectangular cross section for a motorcycle that travels on rough terrain.In this case, a pair of left and right frames spread from the head pipe to the left and right rear, extending rearward, and extending to the outside. It becomes visible from In this way, by using a frame with a square cross section, the radiator cover and the frame with a square cross section can be connected without creating any unevenness, making it easier for the rider to maintain his posture by holding the bike with his feet, or when turning corners. Sometimes it is necessary to connect it so that it does not get in the way when you put your foot forward. Additionally, in order to ensure the rigidity of the connection between the head pipe and the frame, it is necessary to connect the frame to the rear of the head pipe.

Therefore, the upper part of the radiator, which is located behind the head pipe and below the frame, is covered by the head pipe and a frame such as a box frame, and both sides are covered by radiator covers, so that cooling water can be injected into the radiator. For example, removing the radiator cover and injecting cooling water into the radiator is difficult.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a motorcycle in which cooling water can be easily injected into the radiator while ensuring the rigidity of the frame.

[i! Means for Solving the Problem] In order to solve the above problem, the motorcycle of the present invention has a box-shaped frame on the rear side of the head pipe, and when viewed from the side of the head pipe and the upper part of the rear arm pivot. The frame includes a pair of left and right frames with a rectangular cross section connected downward from the rear, a radiator arranged below the frame behind the head pipe, and a cover covering both sides of the radiator, and a guide tube is attached to the box-shaped frame. The head pipe is fixed by passing through it in the axial direction, a pipe for injecting cooling water into the radiator is passed through this guide tube, and a cooling water injection part provided in this pipe is arranged on the upper side of the box-shaped frame. .

[Function] In this invention, the upper part of the radiator is covered with a head pipe, a box-shaped frame, and a frame, and both sides are covered with a cover. It is easy to inject cooling water into the radiator.

In addition, a guide tube is fixed to the box-shaped frame by passing through it in the axial direction of the head pipe, and a pipe for injecting cooling water into the radiator is passed through this guide tube.The box-shaped frame is reinforced with the guide tube, and a special reinforcing member is installed. The rigidity of the box-shaped frame can be improved without using it.

[Example 1] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

Figure 1 is a side view of a motorcycle to which this invention is applied;
The figure is a plan view, Figure 3 is an enlarged side view of the main parts, Figure 4 is a cross-sectional view of IV-■ in Figure 3, Figure 5 is a cross-sectional view showing the radiator, and Figure 6 is the cooling water injection of the radiator. FIG.

This motorcycle is used for riding on rough terrain, for example, in motocross competitions, and a front fork 3 is supported on a head pipe 2 constituting a body frame 1, and the front fork 3 is attached to the lower end of the front fork. 4 is provided. A front fender 5 is attached to the front fork 3, and the front fender 5 is provided with a Zetsuken plate attachment portion 6. This front fender 5 is a fixed type fender that is not linked to the vertical movement of the front wheel 4.

A box-shaped frame 7 is welded to the rear of the head pipe 2.
A pair of left and right tank rails 9 having a rectangular cross section are welded to both sides of this box-shaped frame via a connecting frame 8 that extends left and right and extends rearward. With this box-shaped frame 7, connection frame 8 and tank rail 9, the head pipe 2
and the upper part of the rear arm pivot in a side view of head pipe 2.
A pair of left and right main frames 10 each having a rectangular cross-section are connected downward from the rear. A pair of left and right sub-frames 11 are attached to a mounting bracket 80 welded to the connecting portion of the connecting frame 8 and tank rail 9 that constitute the main frame 10.
are connected via bolts 81, and a rear arm bracket 12 is connected to the rear side, and this rear arm bracket 1
The rear part of the subframe 11 is connected to 2 via bolts 82.

In this way, the box-shaped frame 7 is welded to the head pipe 2, the connection frame 8 is welded to this box-shaped frame 7, and the tank rail 9 is further welded to increase the rigidity of the connection part with the head pipe 2. This makes it possible to apply the main frame 10, which has a rectangular cross section, as a body frame for a motorcycle that runs on rough terrain. In addition, the box-shaped frame 7 welded to the head pipe 2 is arranged in the axial direction L1 of the head pipe 2.
Although the box-shaped frame 7
The axial direction L2 of the tank rail 9 welded to the tank rail 9 via the connecting frame 8 is inclined downward with respect to the axial direction L1 of the head pipe 2, and is welded so as to form an acute angle of 90 degrees or less.

That is, in a motorcycle that travels on rough ground, the head pipe 2 is located at a higher position than in a motorcycle that travels on level ground. For this reason, if the main frame 10 is connected perpendicularly to the axial direction of the head pipe 2, it will be necessary to bend it midway in order to reach the rear arm bracket 12, which is disadvantageous in terms of strength. Furthermore, if the main frame 10 is made thick in order to have a predetermined strength, the weight will increase. Therefore, by welding the tank rail 9 to the box-shaped frame 7 welded to the head pipe 2 via the connecting frame 8 so that the axial direction L2 of the tank rail 9 is at an acute angle with the axial direction L1 of the head pipe 2, the tank rail 9 can be made into a linear shape, and the main frame 10 is lightweight and has improved rigidity.

A cross vibe 13 is connected between substantially central portions of the pair of left and right tank rails 9, and this cross vibe 13 improves the strength of the main frame 10 mainly in the torsional direction. An engine mounting bracket 14 is welded to the lower side of this cross vibe 13, a cylinder 16 of an engine 15 is supported by this engine mounting bracket 14, and mounting brackets 17 and 18 are attached to the subframe 11 on the lower and front sides of the engine 15. The rear side of the engine 15 is supported by a rear arm pivot 1 on a rear arm bracket 12.
9.

This rear arm pivot 19 is pivotally supported between a pair of left and right rear arm brackets 12.
A pair of left and right rear arms 20 are pivotally supported, and a rear wheel 21 is provided at the rear of the rear arms 20 via an axle 22. The link 2 is attached to the rear arm 20 via the support shaft 23.
4 is connected to the rear arm bracket 12, and a link 26 which is pivotally supported on the rear arm bracket 12 via a support shaft 25 is connected to this link 24. A lower end 27a of the rear cushion 27 is connected to this link 26, and an upper end 27b of the reaction cushion 27 is connected to a support bracket 2 welded to the cross vibe 13.
It is pivoted on 8.

Seat rails 30 are connected to a pair of left and right support brackets 29 provided on the cross vibe 13, and each seat rail 30 is connected to a backstay 31, 32.
It is supported by the rear arm bracket 12 via.

Further, the rear part of the seat rail 30 is connected by a cross vibe 91, and the front part 30a of the seat rail 30 is connected to the rear part 30b or the main frame 10 above the riding position.
The width of the conventional seat rail is narrower than the width of the seat rail, but the front attachment of the conventional seat rail is attached to the main frame. In this conventional mounting structure, the joint between the main frame and the seat rail is made by welding or bolts, but because the width dimension is different, the joint is disadvantageous in terms of strength. In order to make the width dimensions of the joints the same, it is necessary to bend the seat rails.

Therefore, by providing the front portions 30a of the pair of left and right seat rails 30 on the cross vibe 13 provided on the tank rail 9, the front portions 30a of the seat rails 30 can be made narrower, resulting in an optimal structure for the riding position. becomes possible. Furthermore, it is possible to construct a lightweight vehicle body frame that is easy to connect to the seat rail 30, has high strength, and is lightweight.

An air cleaner 33 is arranged in a space surrounded by the seat rail 30, the tank rail 9, and the backstays 31 and 32. This air cleaner 33 is connected to a carburetor 34 connected to the cylinder 16 of the engine 15 via a duct 35, and this duct 35 is placed close to the left side of the vehicle body so as not to interfere with the reaction 27. Also, the air cleaner 33 is located behind the rear suspension 27 on the seat 5.
6 so as not to interfere with the reaction 27. This air cleaner 33 has an air suction port 33a formed in the upper part thereof, and also has an air suction port formed in a recess (not shown) at the rear.

An exhaust pipe 36 is connected to the front side of the cylinder 16 of the engine 15, and the exhaust pipe 36 is bent from the left side to the right side of the vehicle body below the front side of the subframe 11, and extends from the right side to the rear. The exhaust pipe 36 extends obliquely upward and rearward from below the air cleaner 33 along a recess 33b formed in the air cleaner 33, and a silencer 37 is connected to the exhaust pipe 36. This silencer 37 is the backstay 3 on the right side.
1 to a shape along the seat rail 30, and is attached to the backstay 31 with a fitting 38 and to the seat rail 30 with fittings 39 and 40. The right back stay 31 is positioned in front of the left back stay 32 in order to secure a space for arranging the silencer 37.

A cross fender 41 is attached to the rear of the seat rail 30, and side covers 43 are attached to both sides of the seat rail 30.

A radiator 44 is arranged in front of the engine 15, and the lower part of this radiator 44 is attached to the subframe 11 with screws 70.
The upper part is attached to the mounting boss 80a of the mounting bracket 80 with a biscuit 1.

The radiator 44 is connected to the engine 1 via the vibrator 45.46.
It is connected to cylinder 16 of engine 1 and circulates cooling water.
5 is designed to cool the air.

Both sides of this radiator 44 are covered with a radiator cover 47, the lower part of this radiator cover 47 is attached to a mounting boss 44a of the radiator 44 with a screw 48, and the upper front side is attached to a mounting boss 44a of the radiator 44 with a screw 48.
9 to the box-shaped frame 7, and the rear side is attached to the mounting boss 51 welded to the lower part of the tank rail 9 with bolts 50,
It is flush with the outer surfaces of the tank rail 9 and the connecting rail 8. The seat surface of the portion of the radiator cover 47 to which the bolt 50 is attached is a recess 47e.
0 does not stand out.

In this way, the radiator cover 47 has a continuous surface that is the same as the outer surface of the tank rail 9 and the connecting flail 8, and does not have a connection structure that overlaps with the main frame 10 side, so there is no unevenness and the rider can You can hold it with your feet to maintain a smooth posture, and it won't get in the way when you put your feet out in front of you when turning a corner.

Further, the radiator cover 47 connects to the radiator 44 and the main frame 1 via the box-shaped frame 7 and the mounting boss 51.
0 side, and even if the radiator cover 47 covers a wide area from above the engine 15 to the front fork 3, sufficient rigidity can be ensured.

Further, a pair of left and right radiator covers 47 are attached so as to open forward, and cool the radiator 44 by introducing running wind. This radiator cover 47 is the tank rail 9
A ventilation window 47a is formed on the side so that the running wind that cools the radiator 44 flows smoothly rearward. Furthermore, a notch 47b is formed at the rear of the radiator cover 47 at a position corresponding to the spark plug 90 of the engine 15, and the position of the spark plug 90 is opened by this notch 47b, so that the spark plug 90 can be viewed from the side of the vehicle body. This makes maintenance easier.

A box-shaped frame 7 welded to the head pipe 2 is located above the radiator 44, and a guide tube 400 passes through the box-shaped frame 7 in the axial direction of the head pipe and is fixed by welding. This guide tube 400 has a pipe 401
is inserted, and this pipe 401 is connected to the upper part of the radiator 44 , and a cooling water injection part 402 provided in this pipe 401 is arranged above the box-shaped frame 7 . By removing the cap 403 of the cooling water injection part 402, cooling water can be injected into the radiator 44 from above the box-shaped frame 7 via the pipe 401.

Further, a guide tube 400 is fixed to the box-shaped frame 7 by passing through it in the axial direction of the head pipe.
The box-shaped frame 7 is reinforced, and the rigidity of the box-shaped frame 7 can be improved without using a special reinforcing member.

A fuel tank 53 straddles the cross vibe 13 above the engine 15 and is disposed between a pair of left and right tank rails 9 and the seat rail 30, and a fuel supply section 54 is provided in front of the fuel tank 53. The upper part of the fuel tank 53 protrudes slightly upward from the tank rail 9, the front side of the fuel tank 53 is close to the rear part of the box-shaped frame 7, and the rear part extends so as to be close to a position above the air cleaner 33.

The seat 5 is attached to the boss 55 provided at the top of the fuel tank 53.
6 and thereby seat 56 .
is attached to cover the entire upper part of the fuel tank 53. A notch 56a is formed in the front side of this seat 56, and the fuel supply portion 5 of the fuel tank 53 is formed in this notch 56a.
4, the front part 56b of the seat 56 extends above the rear part of the box-shaped frame 7, and the rear part 56b of the seat 56 extends above the rear part 5 of the box-shaped frame 7.
6c extends to the rear of the seat rail 30. In this way, the seat 56 is long in the front and back so that the rider can change the riding position back and forth depending on the riding condition.

The outer surfaces of the seat 56 and the connecting frame 8 and tank rail 9 that constitute the main frame 10 are on the same plane, and the outer surfaces of the connecting frame 8 and tank rail 9 and the radiator cover 47 are in the same plane as described above. Connected by continuous planes. Therefore, since the area from the seat 56 to the radiator cover 47 is on the same plane, the rider can smoothly hold the seat with his/her feet to maintain his/her posture, and the rider's foot will feel better when moving forward when turning a corner. Become. For this reason, a main frame 10 with a rectangular cross section is used for a motorcycle that runs on rough terrain, and this main frame 1
Even if the main frame 10 is made wide and visible from the outside, the main frame 10 does not get in the way of the rider's feet, making it possible to apply the main frame 10 with a rectangular cross section to a motorcycle that runs on rough terrain. .

[Effects of the Invention] As described above, in this invention, the upper part of the radiator is covered with a frame such as a head pipe and a box-shaped frame, and both sides are covered with a cover. Since the water injection part is arranged, cooling water can be injected from this cooling water injection part through piping that penetrates the box-shaped frame.
It is easy to inject cooling water into the radiator.

In addition, the box-shaped frame is fixed by passing through the guide tube in the axial direction of the head pipe, and the piping for injecting cooling water into the radiator is passed through the guide tube, so the box-shaped frame is reinforced with the guide tube and special reinforcement is applied. The rigidity of the box-shaped frame can be improved without using any members.

[Brief Description of the Drawings] Figure 1 is a side view of a motorcycle to which this invention is applied;
The figure is a plan view, Figure 3 is an enlarged side view of the main parts, Figure 4 is a cross-sectional view taken along line N-N in Figure 3, Figure 5 is a cross-sectional view showing the radiator, and Figure 6 is the cooling water injection for the radiator. FIG. In the figure, 2 is a head pipe, 7 is a box frame, 8 is a connecting frame, 9 is a tank rail, 10 is a main frame, 44 is a radiator, 47 is a radiator cover, 400
is a guide cylinder, 401 is a pipe, 402 is a cooling water injection part, 4
03 is a cap. Figure 4 Sheep 6 Fire procedure amendment

Claims (1)

[Claims] A box-shaped frame is provided on the rear side of the head pipe, and a pair of left and right frames with a rectangular cross section are connected from the head pipe side to the upper part of the rear arm pivot downward from the head pipe in a side view. It includes a radiator placed below the frame and a cover that covers both sides of the radiator, a guide tube is fixed to the box-shaped frame by passing through it in the axial direction of the head pipe, and cooling water is injected into the radiator through the guide tube. A motorcycle characterized in that a cooling water injection part provided in the pipe is disposed above a box-shaped frame through which a pipe is passed.