JPH08198158A - Body protecting structure of motorcycle - Google Patents

Abstract

PURPOSE: To surely protect a body frame of a motorcycle and its fuel tank when the motorcycle has tumbled without widening the width of the handlebar and enhance the economy in repair and replacement. CONSTITUTION: A motorcycle concerned 10 has a body frame which chiefly consists of a head pipe 4 supporting the front wheel 2 with possibility of steering, a fuel tank 6 installed behind the head pipe 4, and a left and a right main frame 8a, 8a which extend apart from one another backward from the head pipe 4 and on which the fuel tank 6 is installed. Beside the part A of body frame which widens the most in the direction across the vehicle width, a protector 12 is furnished whose side end is located outward laterally from the fuel tank 6 and which protects the wider part A. The protector 12 is fastened to the tail of a side frame 8b, and the main frames 8a, 8a are coupled by a cylinder head part 20c in the neighborhood of the protector fastened part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body protection structure for a motorcycle.

[0002]

2. Description of the Related Art In a conventional motorcycle, the handle width may be widened so that the fuel tank, the main frame supporting the fuel tank, and the like are not damaged when the vehicle falls. That is, in this case, the vehicle body frame such as the fuel tank or the main frame is protected from the road surface by grounding the ends of the step and the handle when the vehicle falls.

[0003]

However, in the conventional motorcycle described above, the grip width is widened according to the handle width, so that the posture of the driver is limited or the overall width of the vehicle is increased, and the size of the vehicle is reduced. There was a problem that it was damaged. In addition, if the body frame or the fuel tank is damaged, there is also the inconvenience of having to repair or replace the body frame and the fuel tank itself.

The present invention has been made in view of the above-mentioned problems of the conventional motorcycles, and reliably protects the vehicle body frame and the fuel tank when the vehicle falls, without widening the handle width, and at a low cost. It is an object of the present invention to provide a motorcycle body protection structure that can be repaired and replaced.

[0005]

The present invention has the following configuration to achieve the above object. That is, the present invention is a head pipe that steerably supports front wheels, a fuel tank that is arranged behind the head pipe, and a space that extends leftward and rightward from the head pipe toward the rear, and
In a motorcycle including a body frame mainly composed of a pair of left and right main frames on which the fuel tank is mounted, a side of a portion of the body frame that is most widened in the vehicle width direction is closer to the side than the fuel tank. And a protection member for protecting the wide portion is disposed, the protection member is attached to the vehicle body frame, and the pair of left and right main frames is provided near the attachment portion of the protection member. Is a vehicle body protection structure for a motorcycle, which is connected by a connecting member.

[0006]

According to the present invention, since the protective member comes into contact with the road surface when the vehicle falls, the vehicle body frame and the fuel tank are not damaged by the road surface. Therefore, it is not necessary to widen the handle width to protect the vehicle body frame and the like.

When the protective member receives a force from the road surface, even if a force is applied to the vehicle body frame via the mounting portion of the protective member, the left and right main frames are connected by the connecting member in the vicinity of the mounting portion. Since they are connected, the connecting member or the main frame on the side opposite to the ground side also receives this force. Therefore, the force received from the road surface is not concentrated and applied only to the portion of the body frame around the mounting portion, and the strength of the body frame is increased.

Further, even if the protective member is damaged, only the protective member needs to be repaired or replaced. Therefore, it is not necessary to repair the vehicle body frame or the fuel tank itself as in the conventional case, and the economical efficiency is improved. .

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a motorcycle according to this embodiment,
FIG. 2 is an enlarged view of a main part in FIG. 3 is a plan view of the motorcycle according to this embodiment, FIG. 4 is a front view of the motorcycle, and FIG. 5 is a sectional view taken along line VV in FIG. FIG. 6 is an exploded perspective view showing the vehicle body protection structure of this embodiment.

In the present embodiment, as shown in FIGS. 1 to 4, a head pipe 4 that steerably supports the front wheels 2, a fuel tank 6 arranged behind the head pipe 4, and a rear portion from the head pipe 4. And a pair of left and right main frames 8 on which the fuel tank 6 is mounted and fixed and which are separated from each other toward the left and right.
motorcycle 10 having a body frame including a and 8a
At a side of a portion (hereinafter, referred to as a wide portion) A that is widest in the vehicle width direction in the vehicle body frame, a side end is located on a side of the fuel tank 6, and the wide portion A is protected. A protector (corresponding to a protective member) 12 is disposed, and the protector 12 is attached to the vehicle body frame, and a pair of left and right main frames 8a, 8a are provided.
The engine 20 near the mounting portion of the protector 12.
Is a vehicle body protection structure connected by a cylinder head portion (an example of a connecting member) 20c.

The configuration of each part of this embodiment will be described below.
As shown in FIGS. 1 and 4, the axle 2a of the front wheel 2 has a pair of left and right front forks 14, 14 at both left and right ends thereof.
The upper bracket 16 is supported by the lower end of the upper bracket 16 and the upper portions of the pair of left and right front forks 14, 14 are supported by the upper bracket 16.
u, under bracket 16d and steering shaft (not shown)
It is supported by the head pipe 4 via. Separate type handles 18, 18 protruding in the vehicle width direction are attached to the left and right ends of the upper bracket 16u.

The left and right main frames 8a, 8a are shown in FIG.
As shown in FIG. 3, the head pipe 4 extends rearward and downward from both left and right side surfaces in a vehicle side view, and as shown in FIG. 3, it curves laterally along the left and right edges of the front lower portion of the fuel tank 6 in a vehicle plan view. In this embodiment, the main frame 8a is bent, and the substantially central portion in the longitudinal direction is the wide portion A of the vehicle body frame.

The body frame of the present embodiment mainly composed of the left and right main frames 8a, 8a is a so-called twin tube frame, as shown in FIG. A parallel multi-cylinder engine 2 arranged below the fuel tank 6.
The 0 is mounted by fixing the rear part and the upper part to the body frame. The engine 20 includes a crankcase portion 20 that rotatably supports a crankshaft (not shown).
a, a cylinder portion 20b which is fastened to the upper surface of the front portion of the crankcase portion 20a with a slight forward inclination, and causes a piston (not shown) to slide on the inner surface, and the cylinder portion 20b.
And a cylinder head portion 20c mounted and fixed on the.

A pair of left and right side frames 8b, 8b are provided below the front portions of the left and right main frames 8a, 8a.
Has been extended. The left and right side frames 8b, 8b
The front end of the cylinder portion 20 is welded to the head pipe 4.
It extends rearward and downward substantially along the axial direction of b, bends slightly rearward and upward, and the rear end is welded to the substantially central portion in the longitudinal direction of the main frame 8a.

Furthermore, the substantially central portion in the longitudinal direction of the front portion of the side frame 8b and the main frame 8a are connected to each other by a reinforcing frame 8b1 extending substantially parallel to the rearwardly rising rear portion of the side frame 8b. The rear portion of the side frame 8b that rises rearward is inclined to match the side edge of the cylinder head portion 20c, and the front end of the rear portion, that is, the bent portion of the side frame 8b, has a cylinder head portion 20c.
The front end portion of is fastened with a screw member 8b2 such as a bolt.

As shown in FIG. 2 or 5, the left and right side surfaces of the rear end of the cylinder head portion 20c are welded to the left and right main frames 8a, 8a, respectively, and the pair of left and right brackets 22, 22 are projected upward. It is fastened with bolts 24. Then, a pair of left and right main frames 8
The a and 8a are connected using the rear end of the cylinder head 20c as a connecting member. The present invention is not limited to this connecting structure, and a member such as a bracket may be provided at the rear end of the cylinder head portion 20c so as to be fixed to the pair of left and right brackets 22, 22. .

As shown in FIG. 2 or 5, the protector 12 has a corner portion where the main frame 8a and the rear end portion of the side frame 8b intersect in a side view of the vehicle so as to conceal the corner portion from the side. It is formed in a substantially triangular shape corresponding to the shape, and its upper portion covers the wide portion A of the main frame 8a and its lower portion covers the rear end portion of the side frame 8b. The protector 12 is made of iron, aluminum, synthetic resin, or the like, but it is considered that a forged aluminum product is preferable in consideration of weight reduction and appearance of the vehicle.

In the center of the protector 12 as viewed from the side,
As shown in FIG. 5 or FIG. 6, a through hole 12a penetrating in the vehicle width direction is provided, and a substantially cylindrical counterbore 12b is formed at the outer opening of the through hole 12a. . On the other hand, at the corner where the protector 12 faces,
A bracket 26 welded to the upper surface of the rear end of the side frame 8b projects upward. In this bracket 26, the female screw hole 2 is formed at the portion where the through hole 12a faces.
6a is provided.

Therefore, in the protector 12, the hexagon socket head cap screw 28 is laterally inserted into the through hole 12a and screwed into the female screw hole 26a of the bracket 26.
It is fastened to the rear end of the side frame 8b. The depth of the counterbore 12b is such that the head of the hexagon socket head cap screw 28 is almost completely counterbored 12b when the protector 12 is fastened.
The size is set so that it can be stored inside.

The above is the configuration of each part of the present embodiment. In this motorcycle 10, as shown in FIG. 1, a seat 32 is arranged above the rear wheel 30 and on the rear side of the fuel tank 6.
And a tail cowl 34 that covers the rear part of the vehicle body around the seat 32, a front end connected to the rear ends of the left and right main frames 8a, 8a, and extends rearward and upward to secure the seat 32 and the tail cowl 34. Left and right rear side frames 8c, 8c for supporting are provided. Further, a step 40 is provided via a step holder 38 on a bracket 36 provided at a connecting portion between the main frame 8a and the rear side frame 8c and extending downward.

According to this embodiment, when the vehicle falls,
Together with the handle 18 and the step 40, the outer surface of the protector 12 comes into contact with the road surface. for that reason,
The wide portion A of the main frame 8a, the fuel tank 6 and the like are not damaged from the road surface. Therefore, without increasing the width of the handles 18, 18, the wide portion A
The fuel tank 6 and the like can be reliably protected.

Further, when the protector 12 receives a force from the road surface, even if a force is applied to the side frame 8b via the hexagon socket head cap bolt 28 and the bracket 26 which are the mounting parts of the protector 12, the vicinity of the mounting part is concerned. The left and right main frames 8a, 8a are the cylinder head 2
Since they are connected by 0c, the cylinder head portion 20c or the main frame 8a on the side opposite to the ground side also receives this force. Therefore, the force received from the road surface is one side frame 8b near the bracket 26.
The strength of the body frame is increased because it is no longer concentrated on only the body.

Further, even if the protector 12 is damaged, it is detachably attached with the hexagon socket head bolt 28, so that only the protector 12 can be repaired or repaired if necessary.
It is sufficient to replace it, and there is no need to repair the body frame and the fuel tank as in the conventional case, which is economical.

The present embodiment is a preferred embodiment of the present invention, and the technical scope of the present invention is not limited to this embodiment. For example, in this embodiment, the cylinder head portion 20
Although c is configured as the connecting member according to the present invention, the present invention is not limited to this, and the connecting member may be another member such as a cross member.

[0025]

As described above, according to the present invention, the vehicle body frame and the fuel tank can be reliably protected when the vehicle falls, without widening the handlebar width. Also, the strength of the vehicle body frame can be increased when the vehicle falls. Further, only the protection member can be repaired / replaced, and the economical efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle according to this embodiment.

FIG. 2 is an enlarged view of a main part in FIG.

FIG. 3 is a plan view of the motorcycle according to the present embodiment.

FIG. 4 is a front view of the motorcycle according to the present embodiment.

5 is a sectional view taken along line VV in FIG.

FIG. 6 is an exploded perspective view showing a vehicle body protection structure of the present embodiment.

[Explanation of symbols]

 2 front wheel 4 head pipe 6 fuel tank 8a main frame 8b side frame 10 motorcycle 12 protector (corresponding to protective member) 20 engine 20c cylinder head part (an example of connecting member) 26 bracket 28 hexagon socket head cap bolt A wide part

Claims (1)

[Claims] 1. A head pipe for supporting front wheels in a steerable manner, and a fuel tank arranged behind the head pipe,
A motorcycle, comprising: a body frame mainly extending from a pair of left and right main frames on which the fuel tank is mounted, the motorcycle extending laterally rearward from the head pipe, and a vehicle width of the body frame. On the side of the portion that spreads most in the direction, the side end is located more laterally than the fuel tank,
And, a protection member for protecting the wide portion is provided, and the protection member is attached to the body frame,
A vehicle body protection structure for a motorcycle, wherein the pair of left and right main frames are connected by a connecting member in the vicinity of a mounting portion of the protection member.