Hossack fork

from Wikipedia, the free encyclopedia
Britten V1000 with Hossack fork (1996)

The Hossack fork is a front suspension for motorcycles by the English inventor Norman Hossack from 1980; it represents a further development of the trapezoidal fork .

technology

With the Hossack fork, a rigid fork (longitudinal axis support) is movably connected to the motorcycle frame via ball joints and two triangular links lying one above the other; The steering movement is transmitted via a scissors joint. The steering angle and caster can be adjusted using the upper ball joint. A comparison test carried out by MOTORRAD magazine in 1993 between motorcycles with conventional telescopic forks , telelever , steering knuckle and wheel hub steering showed the Hossack fork to have the lowest unsprung mass on the front wheel and the highest compensation for the brake buckling.

Duolever (BMW)

application

As early as the 1980s, Hossack supplied various designs for the Hossack fork. Initial concepts envisaged a tubular construction for the rigid front fork. The French designer Claude Fior adopted the design principle for a racing machine in 1988, as did the New Zealand racing motorcycle manufacturer Britten in 1991. In production motorcycles, the Hossack fork was offered as a retrofit kit for the BMW K 100 RS from 1990. In Germany this was the manufacturer Wüdo, who sold the product under the name of Hossack-BMW. The manufacturer stated a weight advantage of 5 kg compared to the standard fork, as well as a five-fold increase in rigidity compared to the telescopic fork (upside down). More recently, Hossack has been offering the fork in the original tube construction for Ducati .

Duolever problem

In 2004, after the appearance of the Duolever from BMW , Hossack published the similarity between it and his fork. Norman Hossack spoke of a "renaming" and "takeover" of his design. BMW now recognizes the Hossack fork as the forerunner of the Duolever.

Web links

Individual evidence

  1. ^ A b c Tony Foale, Vic Willoughby: Motorcycle Chassis Today. 1st edition. Motorbuch Verlag, Stuttgart 1988, ISBN 3-613-01226-X , pp. 102-104.
  2. ↑ MOTORCYCLE . No. 18 , August 21, 1993, p. 14-24 .
  3. ↑ bikeexif.com Fior 500 (accessed October 1, 2013)
  4. ↑ Wüdo catalog 1991, pp. 34–35 and technical supplement. Wüdo Dortmund 1991
  5. ↑ thekneeslider.com (accessed October 1, 2013)
  6. ↑ hossack-design.co.uk ( Memento from February 4, 2010 in the Internet Archive ) (accessed October 1, 2013)
  7. ↑ bmw-motorrad.com Duolever (accessed October 1, 2013)