JPH03193584A - Motorcycle - Google Patents

Abstract

PURPOSE:To secure the rigidity of a radiator cover and made it so as not to impede a rider's footing by attaching a symmetrical pair of front-open radiator covers to a main frame and a radiator respectively, and connecting them to the main frame through a continuous surface. CONSTITUTION:Both sides of a radiator 44 are covered with a radiator cover 47, and the lower part is attached to a mounting boss 44a of the radiator 44, the upper front side to a box type frame part 7 and the rear part to a mounting boss 51 at the lower part of a tank rail 9, respectively, while the radiator cover 47 should be flush with each of outer sides of the tank rail 9 and a connecting rail 8. This symmetrical pair of radiator covers 47 are attached thereto so as to be front-open. Since it is not such a continuous structure that the radiator cover 47 is overlapped with the side of a main frame 10, there are no irregularities, so that a rider is able to keep his position so smoothly through his feet. In addition as the radiator cover 47 is supported by both sides of the radiator 44 and the main frame 10, a sufficient rigidity in thus securable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] 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.

This sheet is attached to cover, for example, a fuel tank, and this fuel tank is arranged to cover a main frame with a cross-section. The radiator cover forms a continuous flat part from the seat attached to the fuel tank through the fuel tank, allowing the rider to hold this flat part with his feet to maintain his posture, and also allows the rider to use his feet when turning corners. It is designed so that it does not get in the way when moving forward.

[Problems to be Solved by the Invention] Incidentally, it is conceivable to use a main frame with a rectangular cross section in a motorcycle that runs on rough terrain, and in this case, since the main frame is wide, it becomes visible from the outside. In this way, by using a main frame with a rectangular cross section, problems arise with connection and installation of the radiator cover and the main frame with a rectangular cross section.For example, unevenness may occur between the main frame and the radiator, and the If it is not flexible, it will be difficult for the rider to maintain his posture by holding the radiator cover with his feet, or it will get in the way when he puts his feet forward when turning a corner.

Furthermore, a radiator cover with a large area is used to effectively guide the running wind to the radiator, but this radiator cover is required to be lightweight and rigid.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a motorcycle in which the rigidity of the radiator cover is ensured, and the radiator cover does not interfere with the rider's footrest.

[Means for Solving the Problems] In order to solve the above problems, the motorcycle of the present invention has a pair of left and right main parts having a rectangular cross section that connects the head pipe and the upper part of the rear arm pivot downward from the head pipe in a side view. a frame, and a pair of front-opening left and right radiator covers that cover both sides of the radiator, the radiator covers being attached to the main frame and the radiator,
It is characterized in that it is connected to the main frame in a continuous plane.

[Function] In this invention, the pair of left and right main frames having a rectangular cross section and the radiator cover are connected by a continuous surface, so the main frame and the radiator cover follow the shape of the foot.
Riders can hold it smoothly with their feet to maintain their posture.
It also improves the feel of your foot when you move your foot forward when turning a corner, etc.

Further, since the radiator cover opens in the front and is attached to the main frame and the radiator, it is possible to effectively guide the running wind to the radiator, and the support is strong and rigidity is ensured.

[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 thereof, FIG. 3 is an enlarged side view of the main part, and FIG. 4 is a sectional view taken along the line IV-rV in FIG. 3.

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 a front fork 3 is attached to the lower end of the front fork. 4 are 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 the box-shaped frame 7 via a connecting frame 8 that extends left and right to the rear. The box-shaped frame 7, the connecting frame 8, and the tank rail 9 constitute a pair of left and right main frames 10 having a rectangular cross section that connect the head pipe 2 and the upper part of the rear arm pivot downward from the head pipe 2 in a side view. ing. A pair of left and right sub-frames 11 are connected via bolts 81 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, and a rear arm bracket 12 is connected to the rear side. This rear arm bracket 12
The rear part of the subframe 11 is connected to the rear part of the subframe 11 via a bolt 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 it is perpendicular to 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 Ll 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 straight line shape, making the main frame lO lighter and having 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 a reaction 27 is connected to this link 26, and an upper end 27b of the reaction 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 17. Further, the rear portion of the seat rail 3o is connected by a cross vibe 91.

Although the front portion 30a of the seat rail 30 is narrower than the rear portion 30b or the width of the main frame 10 due to the riding position, the front portion 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 bridge ender 4 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 the stopper 1.

The radiator 44 is connected to the engine 1 via vibrators 45 and 46.
It is connected to cylinder 16 of engine 1 and circulates cooling water.
5.

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,
The tank rail 9 is flush with the outer surface of the connecting rail 8. The seat surface of the portion of the radiator cover 47 where the bolt 50 is attached is a recess 47e, and the bolt 50
0 does not stand out.

In this way, the radiator cover 47 runs on the same continuous surface 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 it is easy for the rider to You can hold it with your feet to maintain a smooth posture, and it will not get in the way when you put your feet forward 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 foot 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 air. This radiator cover 47 has an air vent window 47a formed on the side of the tank rail 9, so that the running air that cools the radiator 44 flows smoothly rearward.

Furthermore, the engine 15 is located behind the radiator cover 47.
A notch 47b is formed at a position corresponding to the ignition plug 90, and this notch 47b allows the ignition plug 90 to
This position is open so that maintenance of the spark plug 90 can be easily performed from the side of the vehicle body.

Furthermore, a notch 47c is formed in the radiator cover 47 at a portion facing the cooling water supply section 52 of the radiator 44, and cooling water can be easily supplied by removing the cap of the supply section 52 from this notch 47c. It's becoming like this.

A fuel tank 53 straddles the cross pipe 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 feet to maintain his posture. gets better. For this reason, even if a main frame 10 with a rectangular cross section is used for a motorcycle that runs on rough terrain, and the main frame 10 is wide enough to be visible from the outside, the main frame 10 will not get in the way of the rider's feet. , it becomes possible to apply the main frame 10 having a rectangular cross section to a motorcycle that travels on rough terrain.

[Effects of the Invention] As described above, the present invention includes a pair of left and right main frames each having a rectangular cross section, and a pair of left and right radiator covers that open in the front and cover both sides of a radiator, and this radiator cover is connected to the main frame. The pair of left and right main frames, which have a rectangular cross section, and the radiator cover are connected by a continuous surface, so the main frame and radiator cover follow the shape of the feet, allowing the rider to hold them with his or her feet. This improves the feel of your foot when you move your foot forward, such as when maintaining your posture or when turning a corner.

In addition, since the radiator cover opens in the front and is attached to the main frame and radiator, it is possible to effectively guide the driving wind to the radiator, and since the radiator cover is strongly supported, it is reinforced and rigid. will also be secured.

[Brief explanation of drawings]

Figure 1 is a side view of a motorcycle to which this invention is applied;
The figure is a plan view, FIG. 3 is an enlarged side view of the main part, and FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. In the figure, 2 is a head pipe, 7 is a box-shaped 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, 53 is a fuel tank, and 56 is a seat. Patent applicant Yamaha Motor Co., Ltd. Chart procedure amendment December 28, 1999

Claims (1)

[Claims] This radiator cover is equipped with a pair of left and right main frames with a rectangular cross section that connect the head pipe and the upper part of the rear arm pivot downward from the head pipe when viewed from the side, and a pair of left and right radiator covers that open in the front and cover both sides of the radiator. is attached to the main frame and the radiator, and is connected to the main frame in a continuous plane.