Multi-modal monocoque structure for motorcycles
A fastening system for attaching a component to the monocoque of a motorcycle. The fastening system promotes a plurality of riding configurations for the motorcycle. The fastening system includes an assembly of a track and a movable foot piece. The movable foot piece slides along and is locked in the track to secure the component to the track according to a desired riding configuration of the motorcycle. When the component is the headstock, the fastening system allows for a change in the rake angle.
1. A fastening assembly for a motorcycle, the fastening assembly comprising: a track on a monocoque of the motorcycle, the track defining a channel; a foot piece in the channel, the foot piece movable along the channel; a plate; and a fixing device that fastens the plate and the foot piece to the track in a fixed position selected from multiple possible fixed positions along the track, wherein the channel has an inverted T-section that is open to a side of the track distal from the monocoque.
2. The fastening assembly according to claim 1 , wherein the plate is part of a headstock.
3. The fastening assembly according to claim 2 , wherein the track is curved, allowing a rake angle of the motorcycle to be set between 24 and 30 degrees.
4. The fastening assembly according to claim 1 , wherein the plate and the foot piece are fastenable at a plurality of different predetermined positions on the track.
5. The fastening assembly according to claim 1 , wherein the track is concave.
6. The fastening assembly according to claim 1 , wherein:
the foot piece is a rectangular block with two shoulders comprising knurled teeth on upper surfaces of the shoulders; and
the knurled teeth engage with other knurled teeth on overhangs of the channel.
7. The fastening assembly according to claim 1 , wherein: the track is formed in a curved block with a rectangular cross-section; and the channel is open to two ends of the track.
8. The fastening assembly according to claim 7 , wherein:
the curved block defines overhangs over the channel; and
ceilings of the overhangs have knurled teeth.
9. The fastening assembly according to claim 8 , wherein:
the foot piece has shoulders with upper surfaces that have further knurled teeth; and
the overhangs grip to the shoulders when the fixing device is tightened.
10. The fastening assembly according to claim 1 , further comprising:
a second track on the monocoque of the motorcycle, the second track defining a second channel;
a second foot piece in the second channel, the second foot piece movable along the second channel;
a second plate; and
a second fixing device that fastens the second plate and the second foot piece to the second track in a second fixed position selected from multiple possible second fixed positions along the second track, wherein the plate and the second plate are parts of a headstock.
11. The fastening assembly of claim 1 , wherein the fixing device is a screw.
12. The fastening assembly according to claim 11 , wherein the screw screws into the foot piece and has a shoulder that supports the foot piece from underneath.
13. The fastening assembly according to claim 11 , wherein the screw is inserted through the plate and screws into the foot piece.
14. The fastening assembly according to claim 1 , wherein the foot piece has shoulders and the track has ceilings, and the shoulders engage with the ceilings when the fixing device is tightened.
15. The fastening assembly according to claim 1 , wherein:
a bottom face of the plate has knurled teeth;
an outer face of the track has further knurled teeth; and
the knurled teeth and the further knurled teeth are in contact when the fixing device is tightened.
16. The fastening assembly according to claim 1 , wherein the track is curved allowing a rake angle of the motorcycle to be varied within a range of 10 degrees.
17. A motorcycle comprising: a monocoque; a headstock; and a fastening assembly comprising: a track on the monocoque, the track defining a channel; a foot piece in the channel, the foot piece movable along the channel; and a fixing device that fastens the foot piece and the headstock to the track in a fixed position selected from multiple possible fixed positions along the track, wherein the channel has an inverted T-section that is open to a side of the track distal from the monocoque.
18. The motorcycle according to claim 17 , wherein the track is curved, allowing a rake angle of the motorcycle to be varied by up to 10 degrees.
19. The motorcycle according to claim 18 , wherein the rake angle can be set between 24 and 30 degrees.
20. The motorcycle according to claim 17 , wherein the foot piece comprises a knurled surface.
21. The motorcycle according to claim 17 , further comprising another fastening assembly identical to the fastening assembly.