Honda RC212V: Transmission Patent Drawing the Line — Motorcyclist Magazine

16 Фев 2015 | Author: | Комментарии к записи Honda RC212V: Transmission Patent Drawing the Line — Motorcyclist Magazine отключены
Honda RC212V

Something Old, Something New

A patent application details the employed in Honda’s latest MotoGP racer. Surprisingly, the first appeared on Hodaka four decades ago.

A patent application details the employed in Honda’s latest MotoG

In the pre-season MotoGP the new Honda RC212V dominated, the fastest lap time on each Honda’s Casey Stoner pole and won the first race at then set pole again at He might have won there as had he not been taken out in the wet by Valentino

There was talk in the pits of a new and shifting mechanism, something new in the train that was making the easier to ride. Dual-clutch like that employed on the isn’t legal in MotoGP, and is fully electrical shift so those explanations were

However, we got a look at a published patent application showing a new credited to a Mr. Matsumoto, who is a Honda Japanese patent documents the Honda connection and show the in what appears to be the RC212V although Honda has made no statement about it.

The patent shows the mechanism in great and the first thing I thought Hodaka! For those of you without hair, Hodaka produced trailbikes in Japan that sold by the Pacific Basin Company (PABATCO) in Oregon 1964-’80. I sold and worked on in the early ’70s, and the trans- design stuck with me as a and simple mechanism.

Other oldsters have seen the Honda-Hodaka connection.

five primary-shaft gears all fixed to the shaft. The countershaft were in constant mesh their corresponding primary-shaft and in neutral were all free to Under each gear the had four holes, with a resting in each one.

of the freewheeling gears had four indentations on its inner diameter. A shaft rode in the inside of the countershaft and had a detent collar. The shifted by moving the detent so that it pushed the four out into the pockets in the chosen locking it to the countershaft.

Conceptually, the Honda transmission is the The primary-shaft gears are all fixed to the in sequential order, with to the right and sixth to the left. the transmisssion is in neutral, all six corresponding gears, in constant mesh their counterparts, freewheel on the

Honda RC212V

Under each countershaft are four pawls that on axes parallel to the countershaft, two facing in each direction, in to take both drive and torque. Noses on the pawls the edges of recesses on the inner of the gear. In neutral the pawls are retracted, letting the gear and when fully in gear all pawls are pivoted outward to the chosen gear and fix it to the countershaft.

A very clever and complex of indented metal strips inside the countershaft, and are moved and forth by the shift mechanism. pins in holes in the countershaft the strips on the inside, and the pawls on the so that when the pin encounters an on the strips, it moves inward. moves one end of the corresponding pivoting inward (helped by a spring), and the end of the pawl outward, engaging a

What’s particularly interesting is the four pawls don’t all at the same time. If the two drive-torque are engaged, but not the deceleration-torque pawls (or versa), the pawls can “ratchet” to relative freewheeling in the opposite This would potentially two gears to be (partially) selected but with one freewheeling in one direction.

It’s easier to follow the shown in the application than it is to the “software” of selection logic, but one can the “overlapping” shifts would speed the gear change.

riders (Stoner, Dani and Andrea Dovizioso) say the transmission is good, but isn’t a “secret It doesn’t singlehandedly account for the relative superiority of the RC212V. But the make this the most recent development in MotoGP and we hear other teams are at building similar gearboxes. All then, to the little trailbike that pioneered this more than 40 years

All credit, as well, to Honda’s who could take a device for maybe 15 horsepower and transform it one capable of withstanding 250 bhp.

Honda RC212V
Honda RC212V
Honda RC212V
Honda RC212V


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