Honda CB-X Honda CB-X Sequential Sequential TransmissionTransmission
Jonathan LippelJonathan LippelSiddharth SharmaSiddharth SharmaGautam SharmaGautam SharmaHani HeibaHani Heiba
IntroductionIntroduction
A sequential transmission differs from A sequential transmission differs from a standard manual transmission.a standard manual transmission.
Sequential, by definition, means that Sequential, by definition, means that the gears change in a sequence.the gears change in a sequence.– 11stst, neutral, 2, neutral, 2ndnd, 3, 3rdrd, 4, 4thth, 5, 5thth
– False neutralFalse neutral This type of transmission is used in This type of transmission is used in
motorcycles and race carsmotorcycles and race cars– Advantageous to fast gear changes and Advantageous to fast gear changes and
“thoughtless” shifts“thoughtless” shifts
ObjectiveObjective
Successfully create a model of a Honda CB-X Successfully create a model of a Honda CB-X sequential transmission.sequential transmission.
Correctly measure and design the gears, counter and Correctly measure and design the gears, counter and main shafts, shift forks, shift drum, rods, bearings, main shafts, shift forks, shift drum, rods, bearings, and casing.and casing.
Use these parts to represent a working assembly and Use these parts to represent a working assembly and animation. animation.
Without a reference manual for direct values, Without a reference manual for direct values, accurate measurements are required.accurate measurements are required.
Most of the assembly is comprised of moving parts, Most of the assembly is comprised of moving parts, requiring many connections.requiring many connections.
ChallengesChallenges
PartsParts
CasingCasing– general model general model
encompassing key encompassing key dimensionsdimensions
Shift forks Shift forks – Utilized extrude, Utilized extrude,
revolve, rib, revolve, rib, move/copy, and move/copy, and patternpattern
– Dictate the movement Dictate the movement and engagement of and engagement of respective gearsrespective gears
Shift DrumShift Drum
Created using revolve, Created using revolve, as well as advanced as well as advanced techniques of wrap techniques of wrap and sweep cut.and sweep cut.
Dictates the Dictates the movement of the shift movement of the shift forks, guiding them forks, guiding them via grooves.via grooves.– Simulated this as a slot Simulated this as a slot
connectionconnection Rotated by the Rotated by the
gearshift lever gearshift lever operated by the operated by the driver.driver.
Gear and AssemblyGear and Assembly
Gears required Gears required precise precise measurementsmeasurements
Five gears sit on both Five gears sit on both the main and counter the main and counter shafts.shafts.
ConnectionsConnections– Different gears Different gears
required pin and slider required pin and slider connectionconnection
– Joint axis settings also Joint axis settings also usedused
AnimationsAnimations
Rotational view of the assemblyRotational view of the assembly First gear/Fifth GearFirst gear/Fifth Gear
– Required gear ratios between every gear, as well Required gear ratios between every gear, as well as cam connections between the engaged gear as cam connections between the engaged gear and respective gear.and respective gear.
Engaged gear dictates the speed of the shaftEngaged gear dictates the speed of the shaft Shift ForksShift Forks
– Animation shows gear change with rotation of shift Animation shows gear change with rotation of shift forkfork
– Simultaneously, the forks are guided by the shift Simultaneously, the forks are guided by the shift drum.drum.
ThanksThanks
To Ray ChangTo Ray Chang– For going above and beyond his duties to For going above and beyond his duties to
ensure that the projects could be completedensure that the projects could be completed
To Mark SproulTo Mark Sproul– For taking personal time to explain the inner For taking personal time to explain the inner
workings of the transmissionworkings of the transmission– For allowing us to borrow his partsFor allowing us to borrow his parts– For entertaining us with his racing endeavorsFor entertaining us with his racing endeavors