Brakes – Internal-resistance motion retarder – Controlled by an operator remote from retarder
Patent
1995-08-17
1996-10-22
Butler, Douglas C.
Brakes
Internal-resistance motion retarder
Controlled by an operator remote from retarder
188319, 18832215, 18832222, 267 6415, F16F 932, F16F 946
Patent
active
055667961
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a one-pipe shock absorber comprising a cylinder, a piston movable in said cylinder, fluid passages hollowed out in the piston, damping valves which close the passages until a certain fluid pressure is reached and means to enable the damping to be adjusted both for the outward stroke and for the inward stroke, as disclosed in DE-A-2945015.
In motor and motor cycle racing, shock absorbers are used which can be adjusted to changing circumstances because the damping force and damping characteristics can be adjusted without dismantling operations. It must be possible for this adjustment to take place in a simple manner in the pull direction and, independently thereof, in the push direction. These independent adjustment facilities are known in the case of known two-pipe shock absorbers. The one-pipe shock absorbers currently available commercially do not permit two independent adjustments. It is known to adjust a fluid flow in the shock absorber, especially at low damping speeds, with the aid of a regulating needle adjusting device. Drawbacks of this device are the poor reproducibility and the temperature sensitivity. Another known one-pipe shock absorber has an inwards adjustment device (for push) which is fitted in a separate tank connected to the shock absorber by means of a connecting pipe; the outwards adjustment device (for pull) is located in the piston rod. This shock absorber takes up a large amount of room, but a more serious drawback is that damping in the inwards direction is based on the displacement of fluid by means of the piston rod to the said tank, the fluid pressures having to be relatively high in order to achieve the specific damping force, in view of the restricted piston rod cross-section.
The aim of the invention is to provide a one-pipe shock absorber which is independently adjustable in the pull and push directions without dismantling the shock absorber from the vehicle, which takes up little room, which shows good reproducibility and low temperature sensitivity and which operates effectively, especially in the low to medium speed range in the damping characteristics.
According to the invention, the one-pipe shock absorber mentioned above is, to this end, characterised in that said passages are made both in a first damping disc for damping the outwards piston movement and in a second damping disc for damping the inwards piston movement, which damping discs are movably fitted in the piston with a fixed axial spacing relative to one another, in that a seating ring extends between the two damping discs and said spacing between the damping discs is greater than the height of the seating ring, so that when the one damping disc engages on the seating ring the other damping disc is clear of the seating ring, and in that the adjusting means for damping comprise a slide which is affixed to each damping disc and can be operated remotely, which slides are able, respectively, to close a larger or smaller number of passages in the damping discs.
To enable the damper to be adjusted easily close to the upper eye in the pull and push directions, each of the slides is connected to a rotating rod which extends through the hollow piston rod, which rotating rods are each provided with an adjusting element close to the upper eye of the shock absorber.
Preferably, each of the two slides is on the one hand provided with a finger which is connected to an adjuster plate which can be caused to rotate by means of a rotating rod and, on the other hand, provided with a stop finger, which is able to fall into stop recesses in the associated damping disc. For example, both adjusting devices each have eight discrete repeatable positions, each position corresponding to a complete damping characteristic.
In order to prevent extremely high damping forces arising at relatively high speeds, the piston also has one or more bypass holes which can be closed by a bypass valve, which bypass valve opens when the fluid pressure in the piston chamber is high.
Because both damping discs are connected with a
REFERENCES:
patent: 967285 (1910-08-01), Wilson
patent: 2579058 (1951-12-01), Trimble et al.
patent: 3561575 (1971-02-01), Allinquant
patent: 3827538 (1974-08-01), Morgan
patent: 3937307 (1976-02-01), De Kock
patent: 4121704 (1978-10-01), Nicholls
patent: 4232767 (1980-11-01), De Kock
patent: 4305486 (1981-12-01), Cowan
patent: 4503951 (1985-03-01), Imaizumi
patent: 4953671 (1990-09-01), Imaizumi
patent: 4961483 (1990-10-01), Yamaoka et al.
patent: 5018608 (1991-05-01), Imaizumi
patent: 5044474 (1991-09-01), DeKock
patent: 5133434 (1992-07-01), Kikushima et al.
patent: 5207300 (1993-05-01), Engel et al.
patent: 5242038 (1993-09-01), Yamaoka
patent: 5248014 (1993-09-01), Ashiba
Butler Douglas C.
Koni B.V.
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