Motor vehicles – Special wheel base – Having only two wheels
Patent
1989-12-21
1990-11-27
Marmor, Charles A.
Motor vehicles
Special wheel base
Having only two wheels
180219, 280699, 280718, 267227, 267229, 267 361, 267 47, B62K 1100
Patent
active
049729209
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to shock absorbing suspensions of vehicles and, more particularly, to a front or rear wheel suspension of a motorcycle.
BACKGROUND OF THE INVENTION
Most of the known wheel suspensions of motorcycles include a guide means in the form of a swinging arm or fork carrying the wheel, and a resilient element in the form of a coil spring the interior of which accommodates a means for suppressing oscillations or a hydraulic shock absorber pivotably connected to the frame of the motorcycle and to the swinging arm at the length thereof between its swing axis and the wheel axis.
Such suspensions are described, for example, in the publication "Mototsikl Dnepr-16", 1985, the Avtoexport Publishers, Moscow.
Construction of such suspension in the form of coil springs, despite small overall size thereof, requires much metal to be consumed for manufacture. For example, the quantity of metal consumed for the resilient arrangement of the rear wheel suspension of such heavy class motorcycle as the "Dnepr" amounts to 0.0023 kg per unit (newton) static load. By way of comparison, it should be noted that in the dump truck KamAZ-5510 (cf., I. M. Jurkovsly and V. A. Tolpygin "Avtomobil KamAZ", 1975, the DOSAAF Publishers, Moscow) the similar factor is 0.00178 kg/N, an improvement by 29%.
There is known a more advanced wheel suspension of the "Dnepr" motorcycle (cf., "Mototsikl Dnepr-16", 1985, the Avtoexport Publishers, Moscow) comprising a swinging arm carrying the wheel, and a resilient element with a shock absorber connected to the swinging arm. The resilient element is fashioned as a cylindrical coil spring, whereas the shock absorber has the form of a hydraulic-action suppressor of oscillations accommodated concentrically inside the resilient element.
However, apart from the aforedescribed metal over-consumption, this known suspension includes excessive number of working parts. In addition, the suspension fails to ensure a sufficiently smooth ride, and in certain operating conditions fails to get rid of substantial inertia loads imparted to the riders and to the motorcycle structure during recoil.
SUMMARY OF THE INVENTION
The invention aims to provide a motorcycle wheel suspension with a resilient element which would be more pliant during the wheel travel than in the known constructions of wheel suspensions, require less metal for its fabrication and ensure a smoother riding performance of the motorcycle.
The aims of the invention are attained by that in a wheel suspension of a motorcycle comprising a swinging arm carrying the wheel, and a resilient element with a shock absorber connected to the swinging arm and to the frame, according to the invention, the resilient element is C-shaped in the flexure plane and includes a middle portion with a straight neutral line and end portions with a curved neutral line, the resilient element having a substantially uniform cross sectional configuration and area through its length; in the middle portion all the major long axes of inertia of the cross sections being similar and resting in the flexure plane of the resilient element, the major short axes of inertia having an equal length; in the end portions the major long axes of intertia gradually shortening, while the major short axes of inertia gradually elongating to the extent that at a certain point of the cross section they become equal in length to the major long axes of inertia.
The proposed suspension makes motorcycle ride smoother thanks to optimizing the non-linear resilient characteristic. In addition, impact loads imparted to the riders and motorcycle frame are reduced thanks to that the C-shaped resilient element acts to absorb the dynamic action during recoil as effectively as in the work travel. In the middle portion the resilient element is flexed in the plane of the highest rigidity, whereas in the end portions, starting from the cross section where the two major moments of inertia are equal, it is flexed in the direction of the least rigidity, i.e., the end portions are
REFERENCES:
patent: 4082307 (1978-04-01), Tait
patent: 4429760 (1984-02-01), Zoizumi et al.
patent: 4763885 (1988-08-01), Zamitter
Kljubin Vladimir N.
Miichenko Anatoly M.
Nichal Bogdan A.
Zamitter Mikhail N.
Gerich Martin W.
Marmor Charles A.
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