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A slipper clutch(also known as a back-torque limiter) is a specialized clutch with an integrated freewheel mechanism, developed for performance-oriented motorcycles to mitigate the effects of engine braking when riders decelerate.
The main purpose of a slipper clutch is to prevent over engine rev and rear wheel hop (or clatter) especially under hard braking in a vehicle (usually performance motorcycles). It does so by partially slipping until the engine's speed matches with the vehicle's speed upon sudden braking.[1][2]
The slipper clutch consists of two bases, one with dog clutches and ramps with ball bearings, a splined hub, and clutch plates. In normal operation, the dog clutches mate, driving the transmission. When a back torque comes from the transmission, the splined hub slides up the bearing ramps, disconnecting from the clutch plates and allowing a limited slip between input and output.
This type of clutch is designed to partially disengage or "slip" when the rear wheel tries to drive the engine faster than it would run under its own power. The engine braking forces in conventional clutches will normally be transmitted back along the drive chain causing the rear wheel to hop, chatter or lose traction.[3] This is especially noted on larger displacement four-stroke engines, which have greater engine braking than their two-stroke or smaller displacement counterparts. Slipper clutches eliminate this extra loading on the rear suspension, giving riders a more predictable ride and minimize the risk of over-revving the engine during downshifts. Slipper clutches can also prevent a catastrophic rear wheel lockup in case of engine seizure. Generally, the amount of force needed to disengage the clutch is adjustable to suit the application.
Slipper clutches have also been used to a lesser extent on automobiles, primarily those powered by motorcycle engines. They can also be found on racing remote control cars.[citation needed] Some experimental aircraft use a slipper clutch to control torsional resonance in the drive train and protect the engine from shock in the event of a propeller strike.[citation needed] A slipper clutch for an automobile was patented with a French priority date of 1953 to J.Maurice et al.[4] The principle of this slipper is identical to that used in modern motorcycles.
One-way sprag clutches have also been used for the same purpose, but are generally not adjustable for disengagement force. Early Honda Shadow models used a design wherein a sprag clutch is connected to just half of the clutch friction plates, allowing the clutch to slip during heavy backloading sufficiently to prevent rear-wheel lockup, while still allowing moderate engine compression braking with the remaining friction plates.
Historyedit
Slipper clutches have been used in most high displacement four strokeroad racing motorcycles since the early 1980s, having been introduced on the Honda NR500 in 1982[5] in 500GP. Slipper clutches are now fitted to many current sport bikes.
^Stoffregen, Jürgen (2012-03-28). Motorradtechnik: Grundlagen und Konzepte von Motor, Antrieb und Fahrwerk (in German). Springer-Verlag. ISBN978-3-8348-2180-5.
slipper, clutch, this, article, need, rewritten, comply, with, wikipedia, quality, standards, help, talk, page, contain, suggestions, march, 2011, slipper, clutch, also, known, back, torque, limiter, specialized, clutch, with, integrated, freewheel, mechanism,. This article may need to be rewritten to comply with Wikipedia s quality standards You can help The talk page may contain suggestions March 2011 A slipper clutch also known as a back torque limiter is a specialized clutch with an integrated freewheel mechanism developed for performance oriented motorcycles to mitigate the effects of engine braking when riders decelerate The main purpose of a slipper clutch is to prevent over engine rev and rear wheel hop or clatter especially under hard braking in a vehicle usually performance motorcycles It does so by partially slipping until the engine s speed matches with the vehicle s speed upon sudden braking 1 2 Contents 1 Design 2 History 3 See also 4 References 5 External linksDesign editThe slipper clutch consists of two bases one with dog clutches and ramps with ball bearings a splined hub and clutch plates In normal operation the dog clutches mate driving the transmission When a back torque comes from the transmission the splined hub slides up the bearing ramps disconnecting from the clutch plates and allowing a limited slip between input and output This type of clutch is designed to partially disengage or slip when the rear wheel tries to drive the engine faster than it would run under its own power The engine braking forces in conventional clutches will normally be transmitted back along the drive chain causing the rear wheel to hop chatter or lose traction 3 This is especially noted on larger displacement four stroke engines which have greater engine braking than their two stroke or smaller displacement counterparts Slipper clutches eliminate this extra loading on the rear suspension giving riders a more predictable ride and minimize the risk of over revving the engine during downshifts Slipper clutches can also prevent a catastrophic rear wheel lockup in case of engine seizure Generally the amount of force needed to disengage the clutch is adjustable to suit the application Slipper clutches have also been used to a lesser extent on automobiles primarily those powered by motorcycle engines They can also be found on racing remote control cars citation needed Some experimental aircraft use a slipper clutch to control torsional resonance in the drive train and protect the engine from shock in the event of a propeller strike citation needed A slipper clutch for an automobile was patented with a French priority date of 1953 to J Maurice et al 4 The principle of this slipper is identical to that used in modern motorcycles One way sprag clutches have also been used for the same purpose but are generally not adjustable for disengagement force Early Honda Shadow models used a design wherein a sprag clutch is connected to just half of the clutch friction plates allowing the clutch to slip during heavy backloading sufficiently to prevent rear wheel lockup while still allowing moderate engine compression braking with the remaining friction plates History editSlipper clutches have been used in most high displacement four stroke road racing motorcycles since the early 1980s having been introduced on the Honda NR500 in 1982 5 in 500GP Slipper clutches are now fitted to many current sport bikes See also editFreewheel Clutch Sprag clutchReferences edit MC Garage Video How Motorcycle Slipper Clutches Work and Why They re Awesome Motorcyclist Retrieved 2018 03 19 Slipper Clutch Working Advantages amp Disadvantages bikeadvice in 7 March 2018 Retrieved 2018 03 19 Stoffregen Jurgen 2012 03 28 Motorradtechnik Grundlagen und Konzepte von Motor Antrieb und Fahrwerk in German Springer Verlag ISBN 978 3 8348 2180 5 US patent 3072234 Slipper Assist Clutches Are Appearing On More New Motorcycles Cycle World May 10 2019 External links editDetailed history B1 EP 0854304 B1 Friction clutch for vehicles nbsp This motorcycle scooter or moped related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Slipper clutch amp oldid 1201981813, wikipedia, wiki, book, books, library,
