JP3296110B2 - Motorcycle body center structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In general, in a motorcycle, an exhaust pipe and a shock absorber are arranged on a side portion of a vehicle body, and generally cause an increase in the width of a central portion of the vehicle body. However, if the vehicle width is too large, it affects the maneuverability. Therefore, attempts have been made to arrange the exhaust pipe and the shock absorber so as not to increase the vehicle width. For example, a so-called monosus has been proposed in which an exhaust pipe is made as close to the vehicle body side as possible below one side of the vehicle body and a single shock absorber is provided so as to pass through the center of the vehicle body.

In addition, the cylinder is tilted forward, and an air cleaner box is disposed immediately after the steering head and above the cylinder to concentrate the mass. However, further downsizing of the vehicle center was desired.
Furthermore, there has been a demand for minimizing the adverse effects of the high heat generated by the exhaust pipe on, for example, an attached tank of a suspension or a battery.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to make the center portion of a motorcycle more compact and to generate a high heat generated by an exhaust pipe. It is an object of the present invention to provide a motorcycle body central structure capable of reducing a part which is easily affected by the heat from the exhaust pipe and reducing an adverse effect of the high heat on the part.

[0005]

The configuration of the present invention is as follows. That is, the motorcycle body central portion structure of the motorcycle according to the present invention includes an upper pipe extending obliquely downward and rearward from an upper center of the head pipe, and a down tube extending at an acute angle from the upper pipe and downward from a lower portion near a connection point with the head pipe. An undertube extending rearward from a lower end of the downtube, a main tube connecting the undertube to the upper pipe, a seat rail pipe extending rearward from an upper portion of the main tube, the seat rail pipe and the main An automatic vehicle having a body frame basically comprised of a rear pipe positioned between the upper pipe, a down tube, an under tube, and a main tube, the engine body being disposed between the tube and a rear pipe supporting the seat rail pipe. Motorcycle smell Attached to the rear of the cylinder of the engine are an auxiliary tank for the suspension, a main tube, a battery, and an air cleaner spanning the left and right sides of the vehicle, in this order, arranged in parallel to each other along the front and rear direction of the vehicle in a vehicle side view, and The auxiliary tank and battery among them are arranged on the left side of the vehicle in plan view of the vehicle, and the exhaust pipe from the cylinder of the engine is passed through the right side of the vehicle and below the air cleaner in plan view of the vehicle, and the right side of the vehicle. And is connected to a muffler behind the vehicle.

[0006]

Therefore, according to the motorcycle body central structure according to the present invention, the exhaust pipe surrounds the right side from the engine cylinder and is connected to the muffler on the right rear side of the vehicle. Being located, the attached tank and battery keep away from the exhaust pipe. Therefore, the attached tank and the battery can avoid the high heat generated by the exhaust pipe.

Further, since the down tube, the cylinder center axis, the tank attached to the suspension, the main tube, the battery, and the air cleaner are arranged in parallel along the longitudinal direction of the vehicle, the upper pipe, The central portion of the motorcycle body surrounded by the down tube, the under tube, and the main tube is aligned. Therefore, generation of a dead space is suppressed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawings, a vehicle body central portion structure 1 of an off-road motorcycle as a motorcycle according to the present invention will be described in detail according to an illustrated embodiment. FIG. 1 is a side view of a motorcycle employing a motorcycle body central structure according to the present invention, FIG. 2 is a plan view of the motorcycle, and FIG. 3 is an enlarged view of a main part of FIG.

A central structure 1 of a motorcycle body is used for an off-road motorcycle 2 that travels on rough terrain, for example. The off-road motorcycle 2 includes an upper pipe 6 extending obliquely downward and rearward from the upper center of the head pipe 4,
A down tube 8 extending at an acute angle from the lower portion of the vicinity of the connection with the head pipe 4 at an acute angle with respect to the upper pipe 6; an under tube 10 extending rearward from a lower end of the down tube 8; A main tube 12 connecting the rear end of the pipe 6,
A body frame 18 is formed from a seat rail pipe 14 extending rearward from the upper part of the main tube 12 with a gentle inclination and a rear pipe 16 supported between the seat rail pipe 14 and the main tube 12 and supporting the seat rail pipe 14. Basic configuration.

At the center 18a of the body frame 18, a four-cycle engine 20 is mounted.
An exhaust pipe 22 surrounds the right side of the cylinder 20a and is connected to a muffler 24 at the rear of the vehicle.

The tank 26a of the rear suspension 26 and the battery 28 are arranged on the left side of the vehicle.
The down tube 8, the central axis 20a _{1 of the} cylinder 20a, the attached tank 26a, the main tube 12, the battery 28, and the air cleaner 3
0 are arranged so as to be parallel to each other when viewed from the side along the vehicle longitudinal direction. As shown in FIG. Become. In this embodiment, the cylinder 20a
Since the central axis 20a ₁ is of anteversion type,
The main tube 12, the battery 28, and the air cleaner 30 are also arranged in parallel in a forwardly inclined state as shown in FIG.

In the central structure 1 of the off-road motorcycle 2 constructed as described above, the exhaust pipe 22 surrounds the right side from the cylinder 20a of the engine 20, and is connected to the muffler 24 at the rear of the vehicle. Since the attached tank 26a of the rear suspension 26 and the battery 28 are arranged on the left side of the vehicle, the attached tank 26a and the battery 28 are separated from the exhaust pipe 22. Therefore, the attached tank 26a and the battery 28 can avoid high heat generated by the exhaust pipe 22. Therefore, the adverse effects on at least the accessory tank 26a and the battery 28, which are components that are easily affected by the high heat generated by the exhaust pipe 22, can be minimized.

Further, a down tube 10, the cylinder center axis 20a _1, and supplied with the tank 26a of the rear suspension 26, a main tube 12, a battery 28
And the air cleaner 30 are arranged in parallel in the vehicle front-rear direction as viewed from the side, so that the vehicle body 18 includes the upper pipe 6, the down tube 8, the under tube 10, and the main tube 12. The center 18a of the frame 18 is aligned. Therefore, the occurrence of a dead space at the vehicle center 18a is suppressed, so that the vehicle center 18a can be made more compact.

[0014]

According to the structure of the central portion of the motorcycle body of the present invention, the central portion of the motorcycle body is made more compact, and the adverse effects on components that are easily affected by the high heat generated by the exhaust pipe are minimized. be able to.

[Brief description of the drawings]

FIG. 1 is a side view of a motorcycle employing a motorcycle body central structure according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is an enlarged view of a main part of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Body central part structure of motorcycle 4 Head pipe 6 Upper pipe 8 Down tube 10 Under tube 12 Main tube 14 Seat rail pipe 16 Rear pipe 18 Body frame 20 Engine 20a Cylinder 20a ₁ Cylinder central axis 22 Exhaust 24 Muffler 26 Suspension 26a Attached tank (Of suspension) 28 Battery 30 Air cleaner

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B62K 11/00 B62M 7/02

Claims (1)

(57) [Claims] 1. An upper pipe extending obliquely rearward and downward from an upper center of a head pipe, a down tube extending downward from a lower portion near a connection point with the head pipe at an acute angle with respect to the upper pipe, and a lower end portion of the down tube An under tube extending rearward from the main tube, a main tube connecting the under tube and the upper pipe, a seat rail pipe extending rearward from an upper portion of the main tube, and a main rail positioned between the seat rail pipe and the main tube. A motorcycle having a body frame basically composed of a rear pipe supporting a seat rail pipe, and an engine disposed in a portion surrounded by the upper pipe, the down tube, the under tube, and the main tube. rear , The accessory tank suspension, the main tube, a battery, and the air cleaner across the vehicle left-right width, along the vehicle front-rear direction and arranged in parallel to each other in the vehicle side view in that order,
And, among them, the attached tank and the battery are arranged on the left side of the vehicle in plan view of the vehicle, and the exhaust pipe from the cylinder of the engine passes through the right side of the vehicle and under the air cleaner in plan view of the vehicle, and A motorcycle body central portion structure surrounding a right side and connected to a muffler behind the vehicle.