u/Sakurazima_mai

bell crank brake pedal ratio??

last day at michigan, a design judge told us the master cylinder's longitudinal axis needs to be perpendicular to the balance bar bracket so there's no force loss / side loading through the pushrod, and asked us to repackage around that. The result is that there is foot force on the pedal arm, a bell crank at the top, and the balance bar + MCs mounted so the MC axis stays perpendicular to the bracket (parallel to the pedal arm). With this geometry the effective output arm ends up being the perpendicular offset of the MC line from the pivot rather than a simple straight-lever length, so I'm not sure how it compares to a conventional pedal-ratio range.

For teams already using a perpendicular bell-crank pedal like this

What pedal ratio are you running?

-Did the bell crank push you higher or lower than a straight pedal would?

Trying to sanity-check where we should be targeting.

reddit.com
u/Sakurazima_mai — 4 days ago
▲ 6 r/FSAE

bell-crank brake pedal ratio??

last day at michigan, a design judge told us the master cylinder's longitudinal axis needs to be perpendicular to the balance bar bracket so there's no force loss / side loading through the pushrod, and asked us to repackage around that. The result is on the photo. Foot force on the pedal arm, a bell crank at the top, and the balance bar + MCs mounted so the MC axis stays perpendicular to the bracket (parallel to the pedal arm). With this geometry the effective output arm ends up being the perpendicular offset of the MC line from the pivot rather than a simple straight-lever length, so I'm not sure how it compares to a conventional pedal-ratio range.

For teams already using a perpendicular bell-crank pedal like this

What pedal ratio are you running?

-Did the bell crank push you higher or lower than a straight pedal would?

Trying to sanity-check where we should be targeting.

reddit.com
u/Sakurazima_mai — 5 days ago