Table of contents

• Technology: circuit In a hurry
• The automatic switch

fact

counselor

technology & future

Technology: circuit

Technology: circuit
In a hurry

Clear the road, step on the gas and quickly step through the aisles ?? works like clockwork. However, it is hard to imagine that a dozen components can be levered, turned and pushed in fractions of a second when shifting.

Werner Koch

07/03/2009

The automatic switch
In order to move the gear wheels in their position through the rotary movement of the selector shaft, the force on the selector lever is sent to a ratchet mechanism. In the case of the Suzuki GSX-R 600 transmission shown, two pawls engage the teeth of the shift drum and turn the drum in a certain direction, depending on whether the gear is up or down. After the switching process, the pawl together with the transmission lever is returned to its zero position by the hairpin spring. A spring-loaded lock holds the shift drum in its respective position.

The components of the motorcycle dog clutch
Thanks to closer gradations and fewer rotating masses compared to cars, motorcycle transmissions manage without the complex synchronization of the shifting process. The gear shafts on which the gearwheels transmit the drive force in direct engagement via so-called shift claws are correspondingly short.

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fact

Shifting gears: initial situation.

Starting position
The engine power is transmitted from the clutch to the transmission input shaft. The fixed gear, in this case a double gear, is located there and connects the so-called idler gear with the shaft via the shift claws. Idler wheel because it rotates on a needle bearing and has no positive connection with the gear shaft. The opposite gear on the output shaft absorbs the driving force and transmits it to the chain pinion. The interlocking claws are provided with a so-called relief of about three degrees. This causes the ratchet gears to pull together under load. Thus, the shift fork is spared from destructive side forces.

Switching process
Only when upshifting does the shift fork push the double gear to the right and interrupt the power transmission as soon as the claws are no longer engaged. This process takes around seven hundredths of a second for a sporty, brisk gear change. To do this, however, the transmission, namely the shift dogs, must be completely relieved. This happens during normal gear shifting by separating the clutch disks. In racing, the load relief in the drive train is only achieved by briefly turning back the throttle grip. But this only works without consequential damage if the gear is shifted through consistently and changes position at lightning speed. Disadvantage: The load peaks in the transmission are greater.

fact

Gear change: shifting process.

Next gear
After another three hundredths of a second, the shift fork catapulizes the gear into the next higher gear position. It happens in around 70 percent of cases that for a brief moment (around three hundredths of a second) there is claw on claw and the switching process feels correspondingly bulky and hard. Due to the free angle of rotation of the gears, the claws still slip into their position and ensure the power transmission.

The automatic switch

In order to move the gear wheels in their position through the rotary movement of the selector shaft, the force on the selector lever is sent to a ratchet mechanism. In the case of the Suzuki GSX-R 600 transmission shown, two pawls engage the teeth of the shift drum and turn the drum in a certain direction, depending on whether the gear is up or down. After the switching process, the pawl together with the transmission lever is returned to its zero position by the hairpin spring. A spring-loaded lock holds the shift drum in its respective position.

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