JP2995193B2 - Motorcycle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a motorcycle, and more particularly, to a motorcycle that protects a main frame.

[Related Art] In a motorcycle, a pair of left and right main frames extending rearward from a head pipe are connected, and rear wheels are suspended from the main frames via rear arms, and an engine is mounted on the main frames.

By the way, when the body frame is viewed from the state of the load, concentrated load acts on the joint portion between the head pipe and the main frame. For example, when the main frame is formed of a round pipe, the joint strength between the head pipe and the main frame is increased. Therefore, it is necessary to reinforce with a reinforcing plate. Also, when joining these, the welding line becomes a curve, and it is necessary to weld from the front side to the rear side of the head pipe,
The welding work is troublesome, automation is difficult, and the production cost increases.

[Problems to be Solved by the Invention] Accordingly, a pair of left and right main frames are provided that connect the head pipe and the upper part of the rear arm pivot downward and substantially straight from the head pipe in side view, and the front end of the main frame is defined as the head pipe length. When they are configured to have substantially the same vertical width and to be substantially the same or gradually narrow toward the rear, they can be lightweight and have rigidity.

By the way, in this case, if the side of the main frame is exposed to the outside, in addition to the above-described functionality, the appearance is improved, but in a motorcycle used for a trial competition, the main frame is rocked during traveling. There is a risk of damage due to contact with others. If the main frame is damaged, there are problems such as troublesome replacement of the main frame and an increase in cost.

The present invention has been made in view of the above circumstances, and has as its object to provide a motorcycle that covers and protects an outer surface of a main frame exposed to the outside and can be downsized.

[Means for Solving the Problems] In order to solve the problems and achieve the object, the present invention is configured as follows.

The invention according to claim 1 includes a pair of left and right main frames that connect the head pipe and the upper part of the rear arm pivot in a substantially straight line descending from the head pipe in a side view, and a fuel tank is provided between the pair of left and right main frames. In the motorcycle for trial, in which the fuel tank is covered by a cover provided with a seat, the main frame has a front portion having substantially the same vertical width as the head pipe length, and the same or gradually toward the rear. The lower edge of the main frame and the outer surface below the seat are exposed and covered with a resin protection plate, and a radiator is arranged in proximity to the lower edge of the main frame, Furthermore, arrange the upper edge of the muffler along the lower edge of the main frame,
A motorcycle characterized in that the muffler is supported on a main frame. ].

According to the first aspect of the present invention, the front portion of the main frame is substantially the same vertical length as the head pipe length, and is configured to be the same or gradually narrower toward the rear. Since the side faces are covered with the protection plate, the main frame is protected by the protection plate, and is prevented from being damaged by contact with rocks or the like. In a trial motorcycle, if the protection plate may be damaged by contact with rocks or the like, only the protection plate needs to be replaced, so that replacement is easy and cost can be reduced.

In addition, the outer surface under the seat of the main frame is exposed and covered with a protective plate made of resin, and the outer surface under the seat of the main frame is slim. It is easy to maintain the posture by pinching it.

In addition, the lower edge of the main frame is exposed and the outer surface is covered with a protective plate made of resin, and the radiator can be arranged close to the lower edge of the main frame, enabling downsizing. Can be increased, and interference with obstacles can be prevented.

In addition, the muffler can be placed close to the lower edge of the main frame by arranging the upper edge of the muffler along the lower edge of the main frame and supporting the muffler on the main frame, which reduces the size. It is possible, and the mounting position of the engine can be increased accordingly, and interference with an obstacle is prevented.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 is a side view of a motorcycle to which the present invention is applied, FIG. 2 is a plan view thereof, FIG. 3 is a front view thereof, FIG. 4 is a sectional view taken along line IV-IV of FIG. 1, and FIG. V-V in FIG.
It is sectional drawing.

This motorcycle is used for trial competitions. A front fork 3 is supported on a head pipe 2 of a body frame 1, and a front wheel 4 is provided at a lower end of the front fork 3.

A mounting portion 5 having a projection 5a is integrally formed on the head pipe 2 by casting, and a pair of left and right main frames 6 are fitted to the projection 5a of the mounting portion 5 by fitting a front portion 6a thereof and welded. . A pair of left and right subframes 7 is connected to a front portion 6a of the main frame 6, and a rear arm bracket 8 is connected to a rear portion 6b. A seat rail 9 is connected to upper portions of the pair of left and right rear arm brackets 8, and the seat rail 9 is supported by the rear arm bracket 8 via a back stay 10.

Rear arm pivot between rear arm brackets 8
A pair of left and right rear arms 12 are pivotally supported by the rear arm pivot 11, and a rear wheel 13 is provided at the rear of the rear arm 12 via an axle 14. A support shaft 15 provided between the rear arms 12 is connected to a link 17 pivotally supported by the rear arm bracket 8 via a link 16.
Is connected to a lower end 18a of a rear cushion 18, an upper end 18b of the rear cushion 18 is connected to a cross member 19 provided between the main frames 6, and the rear cushion 18 is disposed along the main frame 6 in side view. , Below the seat 20.

An engine 22 is mounted on the main frame 6, the subframe 7 and the rear arm bracket 8 via an engine mount 21.
The carburetor 24 is connected to the rear of the cylinder 23 of the engine 22. The carburetor 24 is arranged close to the right side of the vehicle so as not to interfere with the rear cushion 18, and an air cleaner 25 is connected to the carburetor 24. The air cleaner 25 is seated above the rear cushion 18.
The rear cushion 18 is arranged at a position below the rear cushion 20 and is connected to the carburetor 24 on the right side of the rear cushion 18 so as not to interfere with the rear cushion 18.

An exhaust pipe 26 is connected to the front side of the cylinder 23 of the engine 22. The exhaust pipe 26 is bent from the right side to the left side of the vehicle body below the front side of the subframe 7 and extends rearward from the left side. 27, and a silencer 28 is further connected. The muffler 27 is supported by the left main frame 6, and the silencer 28 is supported by the left seat rail 9 and the back stay 10.

Above the engine 22, a fuel tank 29 is disposed between the pair of left and right main frames 6. The upper portion of the fuel tank 29 projects slightly upward from the main frame 6, and the rear part of the fuel tank 29 has a cross member 19 and Rear cushion 18
And extends so as to be close to the air cleaner 25. A radiator 30 is disposed in front of the engine 22. The radiator 30 is supported by the sub-frame 7. The radiator 30 is connected to the cylinder 23 of the engine 22 via pipes 31, 32, and a fan 33 is provided behind the radiator 30. Is arranged.

The cooling water supply part 34 of the radiator 30 is projected upward from between the pair of left and right main frames 6 and supported by the cover 35. The cover 35 is provided with the seat 20 and covers the upper part of the fuel tank 6, so that the outer side surface of the main frame 6 is exposed to the outside. The main frame 6 connects the head pipe 2 and the upper part of the rear arm pivot 11 in a substantially straight line descending from the head pipe 2 in a side view. The front portion 6a of the main frame 6 has a vertical width substantially equal to the length of the head pipe. It is long and narrow toward the rear.

The main frame 6 is formed of a substantially square tapered tube,
This substantially square tapered tube can be manufactured, for example, by the following method. That is, while rotating the round pipe, hit with a striking member in the direction perpendicular to the axis, and form a tapered round pipe with a larger diameter toward the end by so-called rotary swaging that gradually changes the protrusion amount of the striking member, Further, it can be manufactured by pressurizing with an outer mold from the outside while an inner mold having a predetermined shape is inserted into the pipe.

As described above, since the front portion 6a of the main frame 6 formed of the substantially square tapered tube is welded to the mounting portion 5 of the head pipe 2, welding can be performed so as to substantially match the shape of the head pipe. Therefore, the welding line can be straightened, and welding on the back side of the head pipe 2 is also eliminated, so that welding can be automated. Further, by forming the main frame 6 with a substantially rectangular tapered tube, even if a large load is applied to the main frame 6, the main frame 6 has a sectional shape corresponding to the load, which is reasonable in strength.

The main frame 6 is not limited to a tapered tube, but may be a frame formed by casting or pressing a U-shaped section by welding. Further, the main frame 6 may have a front portion 6a having substantially the same vertical width as the length of the head pipe and having the same width toward the rear. A protection plate is provided on the outer surface 6c of the pair of left and right main frames 6.
A screw 37 is attached to the protection plate 36. The protection plate 36 is formed separately from the main frame 6. The protection plate 36 is detachably attached with screws or the like, and the vertical width thereof is smaller than the vertical width of the main frame 6.

In this way, the outer side surface 6c of the main frame 6 is not exposed to the outside, and even if it comes into contact with rocks or the like during trial running, it is protected by the protection plate 36. Further, even if the protection plate 36 is damaged by this contact, the protection plate 36 can be restored only by replacing the small protection plate 36. The protection plate 36 may be formed of a rigid material such as a metal, or may be formed of a material capable of absorbing an impact such as a resin, and may be formed of a material that easily returns to its original shape even when deformed. it can. Further, a seal may be attached to the surface of the protection plate 36 or a color sign may be given.

Further, in FIG. 6, the protection plate 36 is provided only at the bent position 6d of the front half of the main frame 6. The protective plate 36 covers the widest place and the weakest place in the box-shaped delta box frame behind the head pipe 2 at the position where it is most likely to hit the rock etc. during trial running. Done effectively.

7 to 13 show the mounting structure of the protection plate.
FIG. 7 shows a recess at a substantially central portion of the outer surface 6c of the main frame 6.
In FIG. 8, the main frame 6 is formed of extruded material, the end 6f of the side is protruded, and the protection plate 36 is inserted into the recess 6g formed by the end 6f. 36 are fitted and stored, and each is tightened and fixed with screws 37.
The corners of the protection plate 36 do not come out so that they do not get caught.

FIG. 9 shows an example in which a nut 38 is fixed inside the main frame 6 in advance, and a screw 40 attached to the protective plate 36 via a rubber 39 is screwed and attached. FIG. 10 shows the protective plate 36 attached to the outer surface of the main frame 6 with double-sided tape 41, and FIG. 11 shows the protective plate 36 attached to the outer surface of the main frame 6 with a flexible tape 42. The protection plate 36 can be easily attached and detached without using a tool. FIG. 12 shows a state in which a stay 43 is provided on the outer surface of the main frame 6 and is attached to a nut 44 of the stay 43 with a screw 45. FIG. 13 shows a mounting hole (not shown) formed in the stay 43 of the main frame 6. Then, the protrusion 47 of the protection plate 36 is attached to the rubber 46 fitted in the mounting hole.
Is attached.

14 to 19 show another embodiment of the mounting structure of the protection plate. The embodiment shown in FIG. 14 and FIG.
53 is fixed to the seat 20, extending from the seat 20 to the central portion of the outer side surface 6c of the main frame 6 so as to cover it,
It is fixed with screws 54. In the embodiment shown in FIGS. 16 and 17, the protection plate 55 is formed integrally with the fuel tank 29, and the protection plate 55 extends from the side of the fuel tank 29,
The outer surface 6c is covered from above the central portion of the main frame 6. At the front end of the fuel tank 29, a mounting bracket 60 is provided. The mounting bracket 60 is mounted to a fixing bracket 62 fixed to the front portion 6a of the main frame 6 via bolts 61. Also, a stop piece is provided at the rear end of the fuel tank 29.
63 is provided, and the stopper 63 is attached to the rear of the main frame 6.
It is hooked and attached to the locking tool 64 provided in 6b. In the embodiment shown in FIGS. 18 and 19, the protection plate 59 is formed integrally with the cover 35. The protection plate 59 extends to the side, and the outer surface is formed from above the central portion of the main frame 6. Cover 6c,
It is tightened and fixed with screws 60.

[Effects of the Invention] As described above, according to the first aspect of the present invention, the front portion of the main frame has substantially the same vertical width as the head pipe length.
It is configured to be the same or gradually narrower toward the rear, and since the outer surface of this main frame is covered with a protective plate,
The main frame is protected by a protection plate, and is prevented from being damaged by contact with rocks or the like. In a trial motorcycle, if the protection plate may be damaged by contact with rocks or the like, only the protection plate needs to be replaced, so that replacement is easy and cost can be reduced.

In addition, the outer surface under the seat of the main frame is exposed and covered with a protective plate made of resin, and the outer surface under the seat of the main frame is slim. It is easy to maintain the posture by pinching it.

In addition, the lower edge of the main frame is exposed and the outer surface is covered with a protective plate made of resin, and the radiator can be arranged close to the lower edge of the main frame, enabling downsizing. Can be increased, and interference with obstacles can be prevented.

In addition, the muffler can be placed close to the lower edge of the main frame by arranging the upper edge of the muffler along the lower edge of the main frame and supporting the muffler on the main frame, which reduces the size. It is possible, and the mounting position of the engine can be increased accordingly, and interference with an obstacle is prevented.

[Brief description of the drawings]

FIG. 1 is a side view of a motorcycle to which the present invention is applied, and FIG.
FIG. 3 is a plan view, FIG. 3 is a front view thereof, FIG. 4 is a sectional view taken along line IV-IV of FIG. 1, FIG. 5 is a sectional view taken along line VV of FIG.
14 to 19 are diagrams showing another embodiment of the mounting structure of the protective plate, and FIG. 14 is a diagram showing another embodiment of the mounting structure of the protective plate. Shows an example of the
15 is a sectional view taken along the line XV-XV in FIG. 14, FIG. 16 shows another embodiment of the mounting structure of the protective plate, FIG. 17 is a sectional view taken along the line XVII-XVII in FIG. 16, and FIG. Shows another embodiment of the mounting structure of
FIG. 19 is a sectional view taken along the line XIX-XIX in FIG. In the drawing, reference numeral 2 denotes a head pipe, 6 denotes a main frame, 6a denotes a front portion, 6b denotes a rear portion, 7 denotes a subframe, and 36, 53, 55, and 59 denote protection plates.

Claims (1)

(57) [Claims] 1. A pair of left and right main frames connecting a head pipe and an upper portion of a rear arm pivot in a substantially straight line descending from the head pipe in a side view, and a fuel tank is arranged between the pair of left and right main frames. In the motorcycle for trial, in which the fuel tank is covered by a cover having a seat, the front portion of the main frame has a length substantially the same as the length of the head pipe, and the width thereof is the same or gradually narrows toward the rear. The lower edge of the main frame and the outer side surface below the seat are exposed and covered with a resin protection plate, and further, a radiator is arranged close to the lower edge of the main frame, and A motorcycle characterized in that an upper edge of a muffler is arranged along a lower edge of the muffler, and the muffler is supported by a main frame.