JPH10310090A - Frame structure for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frame structure for a motorcycle in which assemblage performance of engine auxiliary such as an ignition coil is improved. SOLUTION: In a motorcycle 1 having a body frame 2 provided with a tank rail part 6a provided on the back of a head pipe 10 to be expanded right and left and extended backward and downward, in which a head part of an engine 3 is disposed roughly under the head pipe 10, a reinforcement member 23 is disposed at a junction part of the head pipe 10 with the tank rail part 6a on the right and left, a locking protrusion 24 for fixing a fuel tank and an installation part 25 for engine accessories 4 are integrally formed on the reinforcement member 23, and a fixing member 26 such as a bolt is installed from the back, thereby the engine auxiliary 4 is fixed on the installation part 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle frame structure.

[0002]

2. Description of the Related Art There is a motorcycle body frame having a tank rail portion which is expanded right and left immediately after a head pipe and then extends rearward in parallel with each other. An engine is provided below the tank rail portion. Is installed.

[0003] A gasoline engine is provided with a spark plug, and an ignition coil for supplying a high voltage current to the spark plug is separately provided as an engine auxiliary device.
It is desirable that the high tension cord connecting the ignition plug and the ignition coil be set as short as possible to prevent a voltage drop.Therefore, the ignition coil is usually placed on the tank rail directly above the engine, especially in consideration of the appearance of the vehicle. For example, it is mounted inside one of the tank rails via a mounting plate or the like.

On the other hand, since stress is concentrated at the joint between the head pipe and the left and right tank rails, a reinforcing member (reinforcement) is provided between the members.

On the other hand, the fuel tanks are arranged on the left and right tank rails. For fixing the fuel tanks, for example, a locking plate is separately provided on the reinforcing member, and a fuel tank is provided on the lower front side of the fuel tank. Generally, a locking member is provided, the locking member is locked to a locking plate, and the rear end of the fuel tank is fixed to the vehicle body frame with bolts or the like.

[0006]

However, when the ignition coil is mounted inside one of the tank rails, the mounting bolts are tightened in the vehicle width direction, so that the other tank rails hinder the bolts. Is difficult to tighten. As a result, the assemblability of the ignition coil decreases.

In addition, since the locking plate is provided separately from the reinforcing member, the number of parts, the number of assembling steps, and the weight increase, and the welding length increases, and the welding heat tends to cause distortion around the head pipe. .

The present invention has been made in consideration of the above-described circumstances, and has as its object to provide a motorcycle frame structure in which the assemblability of engine accessories such as an ignition coil is improved.

It is another object of the present invention to provide a motorcycle frame structure in which the number of parts of a vehicle body frame is reduced.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a motorcycle frame structure according to the present invention is expanded right and left immediately after a head pipe as described in claim 1. In a motorcycle having a body frame provided with a tank rail portion extending rearward and downward, and a head of an engine disposed substantially below the head pipe, a joint portion between the head pipe and the left and right tank rail portions is reinforced. Along with arranging the members, a locking projection for fixing the fuel tank and a mounting portion for the engine auxiliary device are integrally formed on the reinforcing member,
A fixing tool such as a bolt is mounted from the rear to fix the engine auxiliary device to the mounting portion.

[0011]

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

FIG. 1 is a left side view showing an example of a motorcycle to which the present invention is applied. As shown in FIG. 1, the motorcycle 1 has a body frame 2, and an engine 3 is mounted on a lower front part of the body frame 2. The engine 3 is provided with a spark plug (not shown), and an ignition coil 4 for supplying a high-voltage current to the spark plug is separately provided as an engine auxiliary device. Reference numeral 5 denotes a high tension cord for connecting the ignition plug and the ignition coil 4.

FIG. 2 is a perspective view of the front portion of the vehicle body frame 2. As shown in FIGS. 1 and 2, the body frame 2 of the motorcycle 1 is a diamond frame using the engine 3 as a strength member, that is, a part of the body frame 2. The body frame 2 is, for example, a twin-tube type, and mainly includes a main frame 6.
, A seat rail 7, a lower tube 8, and a down tube 9.

The main frame 6 has a pair of left and right sides. The main frame 6 is expanded right and left immediately after the head pipe 10 provided on the front head thereof, and then extends parallel to each other and rearward and downward. A pivot portion 6b bent downward at the rear of the rail portion 6a.

A pair of left and right seat rails 7 extend rearward from the vicinity of the bent portion of the main frame 6, and the seat rails extend below the bent portion of the main frame 6 and between the rear portions of the seat rail 7. A pair of left and right lower tubes 8 that support the rails 7 from below are installed.

Further, a down tube 9 extends from the lower front part of the tank rail part 6a toward the rear lower part to just before the head of the engine 3.

The fuel tank 11 is provided on the tank rail 6a.
However, an operation seat 12 is provided on each of the seat rails 7. The motorcycle 1 is covered with a streamlined cowling 13 at the front of the vehicle body to reduce air resistance during traveling and protect a rider from traveling wind pressure.

The head pipe 10 is provided with a steering mechanism 14. This steering mechanism 14 includes:
The front wheel 15 is rotatably supported, and a pair of left and right front forks 16, a handlebar 17, a front fender 18 and the like, which house a shock absorber (not shown), are provided. Steered freely.

On the other hand, the pivot portion 6b of the main frame 6
Is provided with a pivot shaft 19. A base end of a swing arm 20 is pivotally connected to the pivot shaft 19 so as to freely swing around the pivot shaft 19.
The rear wheel 21 is rotatably supported at the free end of the zero. A rear cushion unit 22 is disposed on the base end side of the swing arm 20.

FIG. 3 is an enlarged left side view of the center portion of the vehicle body. As shown in FIGS. 2 and 3, a reinforcing member 23 (reinforcement) is disposed at a joint between the head pipe 10 located immediately above the head of the engine 3 and the left and right tank rail portions 6a. Will be erected.

The reinforcing member 23 is formed, for example, by bending a single plate material, and the fuel tank 1
1 The locking projection 24 for fixing is integrally bent. Also, the rear end of the reinforcing member 23 is bent substantially downward,
At this portion, a mounting portion 25 for the ignition coil 4 is integrally formed.

Then, the ignition coil 4 is fixed to the mounting portion 25 of the reinforcing member 23 with a fixing member 26 such as a bolt. The fixing device 26 is mounted from the rear so that the tightening direction is parallel to the traveling direction of the vehicle.

Further, as shown in FIG.
A locking recess 2 corresponding to the locking projection 24 is provided at the lower front side of
7 are provided.

Next, the operation of this embodiment will be described.

The reinforcing member 23 is formed by bending a plate material and integrally forming a locking projection 24 for fixing the fuel tank 11 and a mounting portion 25 of the ignition coil 4 as an engine auxiliary device. The number of parts, the number of assembly steps, and the weight can be significantly reduced. Further, since the welding length is short, distortion around the head pipe 10 due to welding heat is less likely to occur.

Further, a mounting portion 25 for the ignition coil 4 which is an engine auxiliary device is formed at the rear end of the reinforcing member 23, and a fixing tool 26 such as a bolt is attached rearward so that its tightening direction is parallel to the traveling direction of the vehicle. To fix the ignition coil 4 to the mounting portion 25 of the reinforcing member 23, the ignition coil 4 can be assembled from a wide space above and behind the vehicle body, and the engine coil such as the ignition coil 4 can be mounted. The assemblability of the container is improved.

[0027]

As described above, according to the motorcycle frame structure of the present invention, there is provided a vehicle body frame provided with a tank rail portion which extends right and left immediately after the head pipe and extends rearward and downward. In a motorcycle in which the engine head is disposed substantially below the head pipe, a reinforcing member is disposed at a joint between the head pipe and the left and right tank rails, and the reinforcing member is used for fixing a fuel tank. The locking projection and the attachment part of the engine accessory are integrally formed, and a fixing tool such as a bolt is attached from the rear to fix the engine accessory to the attachment part. It is possible to improve the assemblability of the engine accessory and to reduce the number of parts of the body frame.

[Brief description of the drawings]

FIG. 1 is a left side view of a motorcycle showing an embodiment of a frame structure of the motorcycle according to the present invention.

FIG. 2 is a perspective view of a front portion of a vehicle body frame.

FIG. 3 is an enlarged left side view of a center portion of the vehicle body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Body frame 3 Engine 4 Ignition coil (engine auxiliary equipment) 6a Tank rail part 10 Head pipe 11 Fuel tank 23 Reinforcement member 24 Locking projection 25 Engine auxiliary equipment mounting part 26 Fixture

Claims (1)

[Claims] 1. A motorcycle having a vehicle body frame provided with a tank rail portion extending right and left and extending rearward and downward immediately after a head pipe, wherein an engine head is disposed substantially below the head pipe. In the above, the head pipe 1
2 and a reinforcing member 2 at the joint between the left and right tank rails 6a.
3 and the fuel tank 1
1 Locking projection 24 for fixing and mounting portion 25 of engine auxiliary device 4
A frame structure for a motorcycle, wherein the engine auxiliary device 4 is fixed to the mounting portion 25 by fixing a fixing tool 26 such as a bolt from the rear.