Viscous coupling unit

Viscous coupling unit

A viscous coupling is made up of alternating circular plates. The plates have tabs or perforations in them. The plates are mounted in a sealed drum, and are located very close to each other. The drum is filled with silicone, or some dilatant fluid. When the two sets of plates are rotating in unison, the fluid stays cool and remains in a liquid state. When the plates start rotating at two different speeds, the shear effect of the tabs or perforations on the fluid will cause it to heat up and solidify (Silicone when heated will turn into a near solid; the viscosity of dilatant fluids rapidly increases with shear). The fluid in this state will essentially glue the plates together and transmit power from one set of plates to the other. The size of the tabs or perforations on the plates, along with the number of plates and fluid used will determine the strength and onset of when this mechanical transfer will happen.

Viscous couplings are used as the center differential in some 4WD/AWD vehicles, and also as a limited slip differential (LSD) in rear axles.

External links

* [ Interactive animation]

Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • visco-control unit — See viscous coupling …   Dictionary of automotive terms

  • Four-wheel drive — This article is about the class of vehicle drivetrains. For other uses, see Four by four/Four wheel drive (disambiguation). All wheel drive redirects here. For the all wheel drive in motorcycles, see two wheel drive. The Jeep Wrangler is a 4WD… …   Wikipedia

  • Mitsubishi AWC — All Wheel Control (AWC) is the brand name of a four wheel drive system developed by Mitsubishi Motors.[1] The system was first incorporated in the 2001 Lancer Evolution VII.[2] Subsequent developments have led to S AWC (Super All Wheel Control),… …   Wikipedia

  • Control Trac — Contents 1 Availability 2 Design development 3 Off road testing 4 …   Wikipedia

  • Differential (mechanical device) — For other uses, see Differential. A cutaway view of an automotive final drive unit which contains the differential Input …   Wikipedia

  • Non-Newtonian fluid — Continuum mechanics …   Wikipedia

  • Dilatant — A dilatant (also termed shear thickening) material is one in which viscosity increases with the rate of shear strain. Such a shear thickening fluid, also known by the acronym STF, is an example of a non Newtonian fluid. Comparison of the behavior …   Wikipedia

  • Porsche 993 — Infobox Automobile name=Porsche 993 aka=Porsche 911 Porsche Carrera manufacturer=Porsche class=sports car layout=Rear engine, rear wheel drive body style=2 door coupe 2 door convertible engine=3.6 L flat 6 3.8 L flat 6 predecessor=Porsche 964… …   Wikipedia

  • Alfa Romeo 164 — Infobox Automobile name = Alfa Romeo 164 aka = Alfa Romeo 168 manufacturer = Alfa Romeo parent company = Fiat Group assembly = Arese, Milan, Italy production = 1988–1997 predecessor = Alfa Romeo Alfa 6 Alfa Romeo 90 successor = Alfa Romeo 166… …   Wikipedia

  • Mitsubishi Outlander — For the vehicle known in the United States as the Mitsubishi Outlander Sport, see Mitsubishi RVR. Mitsubishi Outlander Manufacturer Mitsubishi Motors Also called …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”