Sequential Gearboxes

Topics: Manual transmission, Automotive transmission technologies, Transmission Pages: 5 (1705 words) Published: April 10, 2005

This paper will discuss the technology of sequential gearboxes. Relatively new technology, the sequential gearbox has been applied mostly in ATV's, motorcycles, and the automobile racing industry. Recently this technology has begun to reach passenger cars. There are three main points of discussion; the workings of a manual transmission, how a sequential gearbox works and the advantages of them, and the applications of it today. The sequential gearbox is extremely revolutionary and is only used in high-end passenger cars, but maybe one day it will be a luxury the majority of the population will be able to experience.

Sequential Gearboxes

The sequential gearbox is a very interesting twist on a manual transmission. It dates back to the early 20th century; used mostly on motorcycles and other off road equipment during the World Wars (Italia, 1993). Since then this transmission has exploded into not only the racing world but also the passenger car world (Immell, 1994). Sequential gearboxes have numerous advantages over a standard manual transmission. To further understand the concept of a sequential gearbox one must know the basics of how a transmission works, and then can fully understand the advantages of a sequential gearbox. Manual Transmission Basics

Cars or motorcycles need transmissions because of the physics of the gasoline engine. First of all any engine has a redline. A red line is the maximum rpm value above which the engine cannot go without blowing up and sending parts flying everywhere. Transmissions use gears and gear ratios to keep the engine running under its redline. Secondly, transmissions are needed in order to keep the engine in its maximum torque range. Without a transmission the engine would not be efficient at all, because it would never stay in the rpm range with the most power (Brain, n.d.). The whole philosophy behind shifting gears is to keep the engine in its best possible working range. When talking about transmissions there are essentially two different types of them; automatic and manual. A manual transmission simply means that the driver has to shift his or her own gears. An automatic transmission selects the appropriate gear itself based on road speed, engine speed and other technical factors. Sequential gearbox manual transmissions are an advanced type of transmission. How Sequential Gearboxes Work

In a regular manual transmission there are three forks controlled by three rods that are engaged by the shift lever by the driver. The normal "H" pattern that the driver sees on top of the shifter enables him or her to move the shift lever between the control rods for the three forks and thus moving the rods back and forth. When all of these aspects are combined a successful shift is accomplished.

Transmissions on ATV's or motorcycles using sequential gearboxes have a set of gear selection forks that move collars, which engage the gears just like on regular manual transmissions. The gearshift lever is moved up and down by the foot and the transmission is moved from gear to gear. When the gearshift lever is moved by the foot, a ratcheting drum is rotated. This ratcheting drum has grooves cut into the side of it. The grooves on the ratcheting drum will direct the control rods when the drum is away from the transmission's gears. Moving the gear selector fork is the most common use of the grooves. With this in mind, whenever the lever is moved up or down, the drum is rotated one increment. The rotation of the drum allows for movement of the rods or forks as set by the grooves in the drum and the gears are then changed (Brain, n.d.). The gear shifting sequence can only be done in order; this means that no gears can be skipped, because of the rotation of the drum is the only thing that allows the gears to change. The shifting order must be correct whether shifting the gears from a higher gear to a lower or from a...

References: Brain, M. (n.d.) How Sequential Transmissions Work. Retrieved March 27, 2005, from
Brejcha, M. (1993). Automatic transmissions and transaxles: Fundamentals of operation, 31-50. New Jersey. Prentice Hall.
Immell, M. (1994). Automobiles Connecting People and Places, 36-51. San Diego. Lucent Books Inc.
Italia. B. (1993). Great Automakers and their Cars. The Oliver Press Inc. Minneapolis.
Markus, F. (2002 July). BMW M3 SMG. Car and Driver. Retrieved March 26, 2005, from article_id=1878&page_number=1
Stone, M. (August 2002). Shifty Business. Motor Trend. Retrieved March 26, 2005, from
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