GB2088800A

GB2088800A - Motor cycle fairings

Info

Publication number: GB2088800A
Application number: GB8134096A
Authority: GB
Original assignee: Individual
Current assignee: Individual
Priority date: 1980-11-15
Filing date: 1981-11-12
Publication date: 1982-06-16
Also published as: GB2088800B

Abstract

A motor cycle including a frame (18) and a fairing mounted on the frame, the fairing comprising a moulded shell formed to provide a bridge portion (10) having two depending side portions (11) which define with the bridge portion a cavity of generally inverted U-shape in cross-section, a hollow front portion (12) extending upwardly and forwardly from the side portions and forwardly from the bridge portion, and a rear portion (13) extending rearwardly from the bridge portion. The side portions are formed with rearwardly directed faces (14) carrying leg protectors and the fairing is formed with side panels (15) extending between the sides of the rear portion and the inner sides of the side portions. The cavity in the fairing shell is filled with foam plastics material. The fairing protects a fuel tank against impact, the tank either being housed in it or being arranged so that the side panels partially cover the sides of the tank. <IMAGE>

Description

SPECIFICATION Improvements in and relating to motor cycles This invention relates to motor cycles, scooters, mopeds and other like two-wheeled vehicles (hereinafter referred to generically as motor cycles).

The object of the invention is to provide an improved construction of fairing for a motor cycle.

According to the invention there is provided a motor cycle including a frame and a fairing mounted on the frame, the fairing comprising a body formed to provide a bridge portion having two depending side portions which define with the bridge portion a cavity of generally inverted U-shape in cross-section, a front portion extending upwardly and forwardly from the side portions and forwardly from the bridge portion, and a rear portion extending rearwardly from the bridge portion, the side portions being formed with rearwardly directed faces disposed in front of the positions to be occupied by a rider's legs.

Preferably the body of the fairing is adapted, when subjected to an impact, to absorb at least some of the energy of the impact. Thus, the body may comprise a moulded shell filled with a deformable material such as foam plastics.

A fairing of this basic form can be adapted to serve several different purposes. The fairing may be adapted to provide protection for the fuel tank of the motor cycle. It may provide a mounting for instruments and lamps, and it may be adapted to protect a rider's legs in a crash. The fairing may be formed to provide an air inlet and plenum chamber for the engine.

The fuel tank may be housed within the body of the fairing, being disposed in the position above the frame which it conventionally occupies in a motor cycle. Thus, the tank may extend through the bridge portion and into both the front and rear portions of the fairing.'Alternatively, the tank may be mounted at a lower position within the confines of the frame and the fairing may be formed or provided with parts which at least partially cover the sides of the tank.

The front portion of the fairing may extend forwardly beyond the steering head of the front wheel of the motor cycle so that it encloses the head, the front portion being formed at opposite sides thereof with openings for the passage of handlebars connected to the head. The part of the front portion extending forwardly of the steering head may house a headlamp and instruments.

Alternatively, the front portion may terminate rearwardly of the steering head.

The rearwardly directed faces of the side portions of the fairing preferably carry deformable protectors adapted to protect a rider's legs.

The front portion of the fairing may be formed with a plenum chamber in which the air intake or intakes of the engine are disposed, and with at least one air duct which opens forwardly of the front portion and communicates with the chamber.

The invention will now be described, by way of example, with reference to the accompanying drawings, in which: FIGURE 1 is a perspective view of one form of motor cycle fairing embodying the invention, FIGURE 2 is a horizontal section through the fairing shown in Figure 1, FIGURE 3 is a vertical section through the fairing shown in Figure 1, FIGURE 4 shows the fairing incorporated in a motor cycle, FIGURE 5 is a perspective view of another form of motor cycle fairing embodying the invention, FIGURE 6 is a longitudinal section through a further form of fairing embodying the invention, and FIGURE 7 is a horizontal section through the fairing shown in Figure 6.

In all of the embodiments illustrated in the drawings, the fairing comprises a moulded shell formed to provide a bridge portion 10 having two depending side portions 11 which define with the bridge portion a cavity of generally inverted U-shape in cross-section (see particularly Figure 3), a hollow front portion 1 2 which extends upwardly and forwardly from the side portions and forwardly from the bridge portion, and a rear portion 13 which extends rearwardly from the bridge portion 10 and is generally of inverted U-shape in crosssection, the side portions 11 being formed with rearwardly directed faces 14 which, when the fairing is incorporated in a motor cycle, are disposed in front of the positions to be occupied by a rider's legs.The fairing is also formed with generally triangular shaped side panels 1 5 extending between the sides of the rear portion 1 3 and the inner edges of the faces 14.

The faces 14 carry deformable leg protectors 1 6 as shown in Figure 2 (the protectors being omitted in the other views). These protectors are provided along their outer edges with rearwardly extending, smoothly contoured lips 1 7 which act to restrain movement of a rider's legs outwardly from behind the protectors. Thus, the lips prevent the legs splaying outwardly, which could cause injury in an accident. The lips are deformable to absorb at least some of the energy of an impact, and preferably each lip is substantially nondeformable under an outwards impact but deformable to absorb energy of a forwards impact. The lips are formed integrally with the protectors.

As disclosed in my Patent Application No.

22005/77, each leg protector may comprise a shell of a semi-rigid material such as rubber or suitable plastics material which is filled with a deformable material such as foam plastics and is constructed to deform in the manner described, the rearwardly directed face of the protector and the inner face of its lip being covered with a soft padding such as foam runner with a leather or sheet plastics covering.

The fairing is incorporated in a motor cycle as shown in Figure 4. The motor cycle comprises a frame 1 8 mounted on a front wheel 1 9 and a rear wheel 20. The front wheel is carried by a steering head 21 having handlebars 22 and two depending forks incorporating suspension units 23 for the wheel. The rear wheel is carried by two swinging arms 24 and is connected to the frame by two suspension units 25.

The frame 1 8 includes one or two longitudinally extending members 26 and further members 27 and 28, the steering head 21 being supported by the front ends of the members 26 and 28.

The fairing is mounted on the frame 1 7 with the longitudinally extending member or members 26 extending through the downwardly facing channel defined by the rear portion 13, the bridge portion 10 with the side portions 11, and the front portion 12. A seat 29 is mounted on the frame adjacent to the rear portion 14 of the fairing, the seat and the frame together providing a smoothly contoured upper surface. The front portion 12 of the fairing is also smoothly contoured aerodynamically.

In the embodiments shown in Figures 1 to 4 and Figures 6 and 7, the fairing is relatively short and terminates rearwardly of the steering head 21.

In the Figure 5 embodiment, the front portion 12 of the fairing extends forwardly beyond the steering head 21 so as to enclose the head, the front portion being provided at opposite sides thereof with slots 30 through which the handlebars 22 extend. The part of the front portion which extends forwardly from the steering head is formed with a recess closed by a transparent cover and having mounted in it, an instrument panel 31 which may include, for example, a speedometer, a tachometer, an ammeter and a temperature gauge. The front end of the fairing also incorporates a headlamp 32.

The fairing in the embodiments shown in Figures 1 to 4 and Figure 5 houses a fuel tank 33 which extends through the bridge portion 10 into the front and rear portions 12 and 1 3. The fuel tank, which is of metal, is therefore in the position which it conventionally occupies in a motor cycle but it is protected against impact by the fairing.

The longitudinally extending members 26 of the frame extend beneath the fuel tank.

In the embodiment of Figures 1 to 4, the upper face of the fairing is provided with a hinged cover 34 providing access to the filler cap of the fuel tank. In the Figure 5 embodiment, the upper face of the fairing is formed with an aperture 35 to accommodate the filler cap of the fuel tank.

In the embodiment shown in Figures 6 and 7, the motor cycle has a fuel tank 36 which is mounted at a lower position within the frame. In this case, the side panels 1 5 partially cover the sides of the fuel tank so as to protect it against side impacts.

In the embodiment of Figures 6 and 7, the engine 37, which is combined with a gearbox 38, is mounted in a position in which it is inclined to the vertical (or it may be vertical). The air intake for the carburettor or fuel injection system of the engine is shown at 39 and is disposed between the inlet and exhaust valves as disclosed in my Patent No. 1,448,663. The air intake is disposed in a chamber 40 formed in the front portion 12 of the fairing and two forwardly opening "NACA" air ducts 41 formed in the front portion communicate with this chamber. These ducts are also shown in Figure 1. Thus, when the motor cycle is in motion, air enters the ducts and the chamber 40 acts as a plenum chamber in which a body of still air is created for supply to the air intake of the engine.

The moulded shell of the fairing may be formed from a plastics material, for example polycarbonate such as that sold under the Trade Mark "LEXAN", or glass fibre. A plastics shell may be injection moulded or it may comprise a number of vacuum-formed sections. The shell may be double-walled. The shell is filled with a foam plastics material F. Thus, the fairing is adapted to deform under an impact and thereby absorb at least some of the energy of the impact. The fairing may be constructed as described in my Patent No. 1,269,491.

As shown in dotted lines in Figure 2, the foam plastics filling in the cavity in the shell may be provided in the form of layers 42 of progressively increasing densities from the side faces of the front portion 1 2 inwardly towards the inner parts of this portion. The fairing therefore provides a progressively increasing resistance to an impact, the outer layer deforming more readily than the next layer and so on. If desired, sheet plastics webs may be provided between the layers, the foam plastics simply being injected into the compartments between the webs. The webs may be fixed to the shell of the fairing at both their front and rear ends or only at their front ends so that they have "floating" rear ends.

The fairing may have internal ribs or reinforcing plates, for example webs 43 at opposite sides of the fuel tank as in the embodiments of Figures 1 to4.

The fairing can be secured to the motor cycle frame in various ways. Preferably it is attached to the frame 18 behind the steering head 21, the fairing being provided with a removable cover 44 providing access to the attachment means. In another arrangement the side panels 1 5 are secured by bolts to a tube extending between them and located behind the engine. The fairing may be secured to appropriate parts of the engine and gearbox.

As shown in dotted lines in Figure 4, the or each longitudinally extending member 26 of the frame may have an upwardly extending projection 45 which is located, in a complementary recess in the fairing. The or each projection, which may be a tubular member, therefore keys the fairing to the frame and it is not necessary to bolt the fairing to the frame. A particular advantage of this arrangement is that it prevents the fairing being pushed rearwardly relative to the frame in a crash.

The fairing is formed as an integral structure separate from the frame. The integrity of the frame is not affected should the fairing be damaged in a crash.

Claims

1. A motor cycle including a frame and a fairing mounted on the frame, the fairing comprising a body formed to provide a bridge portion having two depending side portions which define with the bridge portion a cavity of generally inverted U-shape in cross-section, a front portion extending upwardly and forwardly from the side portions and forwardly from the bridge portion, and a rear portion extending rearwardly from the bridge portion, the side portions being formed with rearwardly directed faces disposed in front of the positions to be occupied by a rider's legs.

2. A motor cycle according to Claim 1 wherein the body of the fairing is adapted, when subjected to an impact, to absorb at least some of the energy of the impact.

3. A motor cycle as claimed in Claim 2 wherein the body of the fairing comprises a moulded shell filled with a deformable material.

4. A motor cycle as claimed in Claim 1,2 or 3 wherein a fuel tank is housed within the body of the fairing.

5. A motor cycle as claimed in Claim 4 wherein the fuel tank extends through the bridge portion of the fairing into the front and rear portions.

6. A motor cycle as claimed in any one of the preceding claims wherein the body of the fairing is provided with panels extending between the sides of the rear portion and the inner sides of the rearwardly directed faces.

7. A motor cycle as claimed in Claim 6 when dependant on Claim 1,2 or 3 wherein a fuel tank is mounted within the confines of the frame with the side panels of the fairing at least partially covering the sides of the tank.

8. A motor cycle as claimed in any one of the preceding claims wherein the front portion of the fairing terminates rearwardly of the steering head for the front wheel carried by the frame.

9. A motor cycle as claimed in any one of Claims 1 to 7 wherein the front portion of the fairing extends forwardly beyond the steering head for the front wheel carried by the frame so that it encloses the head, the front portion being formed at opposite sides thereof with openings for the passage of handlebars connected to the steering head.

10. A motor cycle as claimed in Claim 9 wherein the front portion of the fairing is formed with a recess closed by a transparent cover and accommodating an instrument panel.

11. A motor cycle as claimed in any one of the preceding claims wherein the rearwardly directed faces of the side portions of the fairing carry leg protectors.

12. A motor cycle as claimed in Claim 11 wherein each leg protector is provided along its outer edge with a rearwardly extending, smoothly contoured lip arranged to restrain movement of a rider's leg outwardly from behind the protector.

13. A motor cycle as claimed in Claim 12 wherein the lip of each leg protector is deformable to absorb at least some of the energy of an impact.

14. A motor cycle as claimed in Claim 13 wherein each lip is substantially non-deformable under an outwards impact but deformable to absorb energy of a forwards impact.

1 5. A motor cycle as claimed in any one of the preceding claims wherein the fairing straddles at least one upper, longitudinally extending member of the frame.

16. A motor cycle as claimed in Claim 1 5 wherein the fairing is secured by attachment means to said member of the frame.

17. A motor cycle as claimed in Claim 1 6 wherein the fairing is keyed to said member of the frame by an upwardly extending projection on the member engaged in a recess in the fairing.

1 8. A motor cycle as claimed in Claim 3 wherein the shell of the fairing contains layers of foam plastics material of progressively increasing densities from the outer side faces of the front portion inwardly towards the inner part of the front portion.

1 9. A motor cycle as claimed in any one of the preceding claims wherein the front portion of the fairing is formed with forwardly opening ducts communicating with a chamber in said front portion in which is disposed at least one air intake of the engine.

20. A fairing for fitting to a motor cycle, the fairing comprising a body adapted for mounting on the frame of the cycle and formed to provide a bridge portion having two depending side portions which define with the bridge portion a cavity of generally inverted U-shape in cross-section, a front portion extending upwardly and forwardly from the side portions and forwardly from the bridge portion, and a rear portion extending rearwardly from the bridge portion, the side portions being formed with rearwardly directed faces arranged so that when the fairing is fitted to a cycle, they are disposed in the front of the positions to be occupied by a rider's legs.

21. A motor cycle substantially as herein described with reference to and as illustrated in Figures 1 to 4 or Figure 5 or Figures 6 and 7 of the accompanying drawings.

22. Any novel feature or novel combination of features disclosed herein and/or shown in the accompanying drawings.