Honda seamless gearbox patent explained

[Dogma]

I had always assumed it was an evolution of the drive dogs we all know and love, but it's much more complex. I see now why it's called seamless and not something like "advanced quick shifter". It never stops transmitting torque.

[Rijko]

very interesting, thanks !

[zed1015]

Nothing really new.
It's basically a glorified ancient scooter christmas tree gearbox.

[LAB3]

Looks like they covered it in every detail, unfortunately I gave up watching due to all those details! Show me how the damn thing works. I'm not an engineer just an inquisitive rider.

[Rob S.]

How does it compare to the "double clutch" transmissions that are all the rage now?

[Dogma]

How does it compare to the "double clutch" transmissions that are all the rage now?

A dual clutch transmission is like two transmissions of whatever type in the same case. One for even gears, one for odd. Well, not a whole second transmission, but a 2nd clutch and driven shaft. I'm not sure of the details of each implementation and how the driven shafts are connected to the final output.

[Dogma]

Nothing really new.
It's basically a glorified ancient scooter christmas tree gearbox.

I'm not familiar with those. Google is finding some stuff for a Lambretta, but I'm not sure it's what you have in mind. Google thinks I'm shopping for decorations, so it's not being super helpful. What I did find looks like a drive dog gearbox, but with the dogs on the ID instead of the side of the gear. The shifter IS the connection to the output shaft, right? You'd still need to unload the gearbox to change gears, so that's not the same as the seamless transmission. Pretty neat little gearbox though. Very simple.

[zed1015]

I'm not familiar with those. Google is finding some stuff for a Lambretta, but I'm not sure it's what you have in mind. Google thinks I'm shopping for decorations, so it's not being super helpful. What I did find looks like a drive dog gearbox, but with the dogs on the ID instead of the side of the gear. The shifter IS the connection to the output shaft, right? You'd still need to unload the gearbox to change gears, so that's not the same as the seamless transmission. Pretty neat little gearbox though. Very simple.

Yes! Vespa, Lambretta and probably a few others.
Input tree gears are locked on the shaft and all rotate at the same speed,.
Output gears rotate independent and are selected by the internal cruifix which drives the output shaft.
Not exactly the same but i did say " Glorified" and certainly a development of the design..
Nothing is really new, Just like Hondas NR750 oval pistons which they tried to claim as their own but was in truth plagiarised from BSA..

[Rijko]

Yes! Vespa, Lambretta and probably a few others.
Input tree gears are locked on the shaft and all rotate at the same speed,.
Output gears rotate independent and are selected by the internal cruifix which drives the output shaft.
Not exactly the same but i did say " Glorified" and certainly a development of the design..

The development being those still required release of drive torque to shift.
Is this development not something new ?

[Rijko]

How does it compare to the "double clutch" transmissions that are all the rage now?

Great system, but not for racing purposes where every gram counts.