JPS6323955B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motorcycle in which a body frame also serves as a fairing that covers around an engine and a steering handle.

In motorcycles, the slightest change in vehicle weight has a major impact on various performances such as acceleration performance and maneuverability, and much attention has been paid to reducing the weight of motorcycles. The structure of a motorcycle, that is, the body frame is made of steel pipes or steel plates so that it has sufficient strength for practical use, the engine is mounted on the frame, and a fairing is attached to it, which reduces the weight of the vehicle. It is no exaggeration to say that the growth rate has already reached its limit.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a motorcycle that is lightweight, strong, and has a heavy body by using a fairing that also serves as a body frame. In order to achieve this objective, the present invention
The front end of a lower fairing in the form of a head pipe shell that connects a front fork that supports the front wheels in a steerable manner is fixed, and an engine is housed inside the lower fairing, so that the engine becomes a strength member of the lower fairing. The engine and the lower fairing are integrally connected to each other, and a streamlined upper fairing that covers the upper front surface of the front fork is connected to the lower fairing so as to surround the head pipe. The base end of the rear fork supporting the rear fork is pivotally supported.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, the motorcycle M is
A vehicle body B having a head pipe 1 at the front end, a front fork Ff that is rotatably connected to the head pipe 1 via a steering shaft 2 and supports a front wheel Wf, an engine E housed and fixed inside the vehicle body B, and an engine E. The main component is the rear fork Rf, which is pivotally connected and supports the rear wheel at its free end.
Their configurations will be explained one by one.

As shown in FIGS. 3 to 8, the vehicle body B includes a lower fairing 3, an upper fairing 4 connected to the upper part thereof, and a rear end of the lower fairing 3 that is separably connected to cover the upper part of the rear wheel Wr. The seat stay 5 has a channel-shaped cross section. As specifically shown in FIGS. 3 and 4, the lower fairing 3 has a shell shape with a front surface 3a, left and right side surfaces 3b, 3b, an upper surface 3c, and a bottom surface 3d, and the rear surface is completely open. The head pipe 1 is fixed to the upper end of a pyramid-shaped hollow neck portion 3e that projects obliquely upward from the front portion of the upper surface portion 3c. Front part 3a
has an air inlet 6, and both side parts 3b, 3b
Air outlets 7, 7 are opened at the left and right sides 3b, respectively, and an air flow distribution plate 9 defining ventilation ducts 8, 8 from the air inlet 6 to the left and right air outlets 7, 7 inside the fairing 3 is located at both the left and right side portions 3b, Connect between 3b. Therefore, the air flow distribution plate 9 helps to strengthen the lower fairing 3 in rigidity. Each ventilation duct 8 is provided with a radiator R of the engine E and a rectifying plate 10 for airflow leading to the radiator R.

The upper fairing 4 has a warhead-shaped front part 4a, left and right side parts 4b, as shown in FIGS. 6 to 8 in particular.
4b and a bottom portion 4c, and has a streamlined shape with an open top and rear surface, and is disposed so as to cover the upper front surface of the front fork Ff. A window 11 is provided in the bottom portion 4c to allow the front fork Ff to pass through, and a connecting arm 12 projecting rearward from the front edge of the window 11 is fixed to the front surface of the head pipe 1. Further, a connecting wall 13 is formed at the center of the rear end of the bottom surface portion 4c and stands upwardly, and is fixed to the front surface of the neck portion 3e of the lower fairing 3.
Furthermore, a pair of connecting arms 14, 14 extending further rearward are formed on both sides of the rear end of the bottom surface portion 4c. is fixed to. A lid plate 15 for closing the window 11 is fixed to the lower surface of the bottom part 4c, and a pair of through holes 16, 16 are bored therein, the size of which is large enough to avoid interference with the legs of the front fork Ff. ing.
On the other hand, the side parts 4b, 4b have a front fork.
Cutouts 18, 18 are formed in the upper part of the Ff to avoid interference with the steering handles 17, 17 and the arm of the operator operating the steering handles 17, 17, respectively.

The engine E is accommodated in the lower fairing 3 from the rear, and is integrally attached to both left and right side surfaces 3a and 3b of the lower fairing 3 by bolts (not shown) so that the engine E becomes a strength member of the lower fairing 3. is fixed to.

The base end of the rear fork Rf is supported by a pivot 19 on both left and right walls of the rear of the engine E so as to be able to swing up and down, and the output shaft of the engine E is disposed coaxially with the pivot 19, and the output shaft of the engine E is fixed thereto. A chain 22 is stretched between a driving sprocket 20 and a driven sprocket 21 fixed to the hub of the rear wheel Wr. Therefore, the output of the engine E is transmitted to the drive sprocket 20, chain 22, and driven sprocket 21 to drive the rear wheel Wr. Also, the rear fork Rf pivot shaft 19 and drive sprocket 20
Since the and are coaxially arranged, the rear fork
There is no tension or relaxation in the chain 22 when Rf swings.

The rear wheels are located between the left and right sides of the rear fork Rf.
The base end of a bifurcated tension link 23 that straddles Wr is pivotally supported, and a swing link 24 whose distal ends are pivoted to each other is pivoted to the base end of a step bracket 25 protruding from the rear end of the engine E. This swing link 24 and the upper surface part 3 of the lower fairing 3 are pivotally supported.
Only one shock absorber 27 with a suspension spring is interposed between the mounting rod 26 at the rear end and the mounting rod 26 at the rear end. Therefore, when the rear fork Rf swings up and down, the swinging link 24 swings back and forth via the tension link 23 to give an expanding and contracting motion to the shock absorber 27, thereby damping the swinging motion. be able to.

In the figure, 28 is a fuel tank, and 29 is an exhaust pipe.

As described above, according to the present invention, the front end of the shell-shaped lower fairing is fixed to the head pipe to which the front fork supporting the front wheel is steerably connected, and the engine is housed inside the lower fairing. The engine and the lower fairing are integrally connected to each other so that the engine becomes a strength member of the lower fairing, and the base end of a rear fork that supports the rear wheel is pivotally supported on the engine, so that the lower fairing is automatically attached. It can also be used as the main part of the body frame that connects the head pipe and rear fork of a motorcycle, eliminating the need for a dedicated body frame or a stay for mounting the fairing. Combined with this effect, the weight of the vehicle can be significantly reduced compared to conventional ones. In addition, the lower fairing has a streamlined upper fairing that covers the upper front of the front fork and is connected to surround the head pipe, so the upper and lower fairings work together to reduce the air resistance of the motorcycle, and the upper fairing also reduces the air resistance of the motorcycle. The area around the head pipe of the lower fairing, where stress is concentrated, can be reinforced, resulting in a strong and lightweight vehicle body, improving acceleration performance,
It is possible to obtain a motorcycle that is excellent in various performances such as maneuverability and fuel efficiency.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of the motorcycle, Fig. 2 is a plan view of the same, and Fig. 3 is a side view of the motorcycle.
The figure is a side view of the fairing, Figure 4 is a front view of the same,
Figure 5 is a sectional view taken along the line V-V in Figure 3, Figure 6 is a partially exploded perspective view of the fairing, Figures 7 and 8,
FIG. 6 is a cross-sectional view taken along the line - and - in FIG. 6; E...Engine, Ff...Front fork,
Fr...Rear fork, Wf...Front wheel, Wr...Rear wheel, 1...Head pipe, 3...Lower fairing, 4...Upper fairing.

Claims (1)

[Claims] 1. The front end of a shell-shaped lower fairing 3 is fixed to a head pipe 1 that steerably connects a front fork Ff that supports a front wheel Wf, and an engine E is housed inside the lower fairing 3. The engine E and the lower fairing 3 are integrally connected to each other so as to serve as a strength member of the lower fairing 3, and a streamlined upper fairing 4 that covers the upper front surface of the front fork Ff is attached to the engine E and the lower fairing 3 so as to surround the head pipe 1. A rear fork is connected to the lower fairing 3 and is further attached to the engine E to support the rear wheel Wr.
A motorcycle with the base end of the Rf pivotally supported.