Honda CB-X Sequential Transmission Jonathan Lippel Siddharth Sharma Gautam Sharma Hani Heiba

The Transmission

Introduction A sequential transmission differs from a standard manual transmission. A sequential transmission differs from a standard manual transmission. Sequential, by definition, means that the gears change in a sequence. Sequential, by definition, means that the gears change in a sequence. –1 st, neutral, 2 nd, 3 rd, 4 th, 5 th –False neutral This type of transmission is used in motorcycles and race cars This type of transmission is used in motorcycles and race cars –Advantageous to fast gear changes and “thoughtless” shifts

Objective Successfully create a model of a Honda CB-X sequential transmission. Successfully create a model of a Honda CB-X sequential transmission. Correctly measure and design the gears, counter and main shafts, shift forks, shift drum, rods, bearings, and casing. Correctly measure and design the gears, counter and main shafts, shift forks, shift drum, rods, bearings, and casing. Use these parts to represent a working assembly and animation. Use these parts to represent a working assembly and animation. Without a reference manual for direct values, accurate measurements are required. Without a reference manual for direct values, accurate measurements are required. Most of the assembly is comprised of moving parts, requiring many connections. Most of the assembly is comprised of moving parts, requiring many connections. Challenges

Parts Casing Casing –general model encompassing key dimensions Shift forks Shift forks –Utilized extrude, revolve, rib, move/copy, and pattern –Dictate the movement and engagement of respective gears

Shift Fork

Shift Drum Created using revolve, as well as advanced techniques of wrap and sweep cut. Created using revolve, as well as advanced techniques of wrap and sweep cut. Dictates the movement of the shift forks, guiding them via grooves. Dictates the movement of the shift forks, guiding them via grooves. –Simulated this as a slot connection Rotated by the gearshift lever operated by the driver. Rotated by the gearshift lever operated by the driver.

Gear and Assembly Gears required precise measurements Gears required precise measurements Five gears sit on both the main and counter shafts. Five gears sit on both the main and counter shafts. Connections Connections –Different gears required pin and slider connection –Joint axis settings also used

Animations Rotational view of the assembly Rotational view of the assembly First gear/Fifth Gear First gear/Fifth Gear –Required gear ratios between every gear, as well as cam connections between the engaged gear and respective gear. Engaged gear dictates the speed of the shaft Engaged gear dictates the speed of the shaft Shift Forks Shift Forks –Animation shows gear change with rotation of shift fork –Simultaneously, the forks are guided by the shift drum.

General Assembly

First Gear

Fifth Gear

Shift Drum and Shift Forks

Changing Gears

Thanks To Ray Chang To Ray Chang –For going above and beyond his duties to ensure that the projects could be completed To Mark Sproul To Mark Sproul –For taking personal time to explain the inner workings of the transmission –For allowing us to borrow his parts –For entertaining us with his racing endeavors