Motorcycle braking systems: Difference between revisions
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Carbon carbon brakes are used in Moto GP. The friction between the carbon discs and carbon pads produces vast amounts of braking force; far greater braking force than conventional steel disc set-ups. They operate have very high operating temperatures, typically between 400-1000°c. Continuous late braking can overheat carbon carbon brakes as they oxidize and wear out faster. The high temperatures needed for carbon carbon brakes to be effective means that they cannot be used in the wet. For wet races the riders have to switch a conventional steel brake set-up. |
Carbon carbon brakes are used in Moto GP. The friction between the carbon discs and carbon pads produces vast amounts of braking force; far greater braking force than conventional steel disc set-ups. They operate have very high operating temperatures, typically between 400-1000°c. Continuous late braking can overheat carbon carbon brakes as they oxidize and wear out faster. The high temperatures needed for carbon carbon brakes to be effective means that they cannot be used in the wet. For wet races the riders have to switch a conventional steel brake set-up. |
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[[Pro Stock Motorcycle|Drag-racing motorcycles]] can reach speeds up to {{convert|180|mph|abbr=on}} over the course of the {{convert|400|m|abbr=on}} race and use disc brakes in conjunction with [[parachutes]] to slow them after the run.<ref name=MotorcycleRacing/>{{rp|43}} |
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==References== |
==References== |
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<ref name="Motorcycle-radial">{{Cite web|url=http://www.motorcycle.com/how-to/radialmount-calipers-3414.html |title= Radial-Mount Calipers: What's all the hubbub, Bub? |author=Jeff Gehrs |publisher=Motorcycle.com |date=9 October 2002}}</ref> |
<ref name="Motorcycle-radial">{{Cite web|url=http://www.motorcycle.com/how-to/radialmount-calipers-3414.html |title= Radial-Mount Calipers: What's all the hubbub, Bub? |author=Jeff Gehrs |publisher=Motorcycle.com |date=9 October 2002}}</ref> |
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<ref name=MotorcycleRacing/>{{cite book|title=Motorcycle Racing |author=Michael Dregni |publisher=Capstone Press |date=1 Jan 1994 |isbn=978-1560652076 |url=http://books.google.co.uk/books?id=jtRoV5jPPrEC&lpg=PA43}}</ref> |
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<ref name=PopMechanic>{{cite blog |url=http://www.popularmechanics.com/cars/a8016/automotive-brakes-get-wavy/ |title=Car Brakes Get Wavy |author=Basem Wasef |date=31 August 2012 |publisher=Popular Mechanics |accessdate=2015-06-06}}</ref> |
<ref name=PopMechanic>{{cite blog |url=http://www.popularmechanics.com/cars/a8016/automotive-brakes-get-wavy/ |title=Car Brakes Get Wavy |author=Basem Wasef |date=31 August 2012 |publisher=Popular Mechanics |accessdate=2015-06-06}}</ref> |
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Revision as of 20:37, 6 June 2015
Motorcycle braking systems have varied throughout time as motorcycles have evolved from the simple bicycles with an engine strapped on to the 220 mph (350 km/h) prototype motorcycles seen racing in Moto GP. Most systems work by converting kinetic energy into thermal energy (heat) by friction.
Spoon brake
Drum brakes, finned housings for cooling.
Hydraulic and mechanical actuation.
Torque reaction arm
MV Agusta was the first to offer a front disc brake motorcycle to the public on a small scale in 1965, on their relatively expensive 600 touring motorcycle, using a mechanical brake linkage.[1]: 80
In 1969 Honda introduced the more affordable CB750, which had a single hydraulically-actuated front disc brake (and a rear drum brake), and which sold in huge numbers.[1]: 80
In a bid to improve wet weather braking performance, Honda fitted inboard ventilated disc brakes to models such as the VF400F and CBX550F. This saw the front brake assembly enclosed in a vented aluminium hub. The caliper was mounted onto the hub and gripped the disc from the outside. The purpose of inboard discs was to keep the brake assembly dry and allowed the use of cast iron ventilated discs because the shrouding covered any unsightly surface rust on the disc.[2] The system would prove to be short lived with all successive models reverting to the standard uncovered layout thereafter.
Early cast wheels were not compatible with drum brakes.
Sintered pads offer improved heat up time and better wet weather performance. Asbestos was used in the brake pads but its use declined when the negative health impact was discovered.
Brake feel, rotor size, caliper positions. Single action calipers have brake pistons that operate on one side only. This type has a floating pin design. Dual action calipers have positions either side of the disc to greatly improve the piston area.[3]
Floating discs have better disc centering with a fixed caliper. A floating disc also avoids disc warping and reduces heat transfer to the wheel hub. Lambretta were the first manufacturer to use floating discs on a volume production motorcycle.
Combined brake systems
ABS BMW main article
Buell Motorcycle Company introduced a rim-mounted "zero torsional load" disc brake that was claimed to reduce unsprung weight in the wheel-brake system, including lighter wheel spokes that carried no braking load.[4] This style is generically termed a "perimeter brake" for its point of attachment to the wheel, and had been used in smaller numbers by other manufacturers before Buell. They can rarely be found on custom motorcycle spoked wheels.[5][6]
Wavy discs place the mass closer to the axle for reduced inertia,[7] better heat dissipation and lower weight.[8]
Radial master cylinders. Radial mounted calipers.
Brake levers, hole in for aerodynamics on race bikes.
Braided brake hoses.
Monobloc Brembo Aluminium lithium alloy, banned for 2015 season
Carbon carbon brakes are used in Moto GP. The friction between the carbon discs and carbon pads produces vast amounts of braking force; far greater braking force than conventional steel disc set-ups. They operate have very high operating temperatures, typically between 400-1000°c. Continuous late braking can overheat carbon carbon brakes as they oxidize and wear out faster. The high temperatures needed for carbon carbon brakes to be effective means that they cannot be used in the wet. For wet races the riders have to switch a conventional steel brake set-up.
Drag-racing motorcycles can reach speeds up to 180 mph (290 km/h) over the course of the 400 m (1,300 ft) race and use disc brakes in conjunction with parachutes to slow them after the run.[9]: 43
References
- ^ a b Frank, Aaron (2003). Honda Motorcycles. MotorBooks/MBI Publishing Company. p. 80. ISBN 0-7603-1077-7.
- ^ Shoemark, Pete (1989). Honda CBX550 572.5cc 1982 to 1986: Owners Workshop Manual. Haynes. p. 6. ISBN 0856969400.
- ^ Jeff Gehrs (9 October 2002). "Radial-Mount Calipers: What's all the hubbub, Bub?". Motorcycle.com.
- ^ Wes Siler (October 13, 2010), Erik Buell Racing 1190RR-B, RideApart
- ^ Cyril Huze (July 15, 2010), "Perimeter Disc Rotors Installed On Spoke Wheels", Cyril Huze Post
- ^ Paul Crowe (2007), "Perimeter Disc Brake Rotors", The Kneeslider
- ^ Bob Gray (30 January 2013). "Knowledge for Dummies: Disc Brakes". Bike Sports News. Retrieved 2015-06-06.
- ^ Basem Wasef (31 August 2012). "Car Brakes Get Wavy". Popular Mechanics. Retrieved 2015-06-06.
- ^ Cite error: The named reference
MotorcycleRacingwas invoked but never defined (see the help page).
<references> tag (see the help page).