Motor vehicles – Bodies – Movable cab or operator's station
Patent
1994-10-05
1997-01-07
Oberleitner, Robert J.
Motor vehicles
Bodies
Movable cab or operator's station
267220, B62D 3306
Patent
active
055907334
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention concerns a shock-absorbing and sprung suspension arrangement comprising at least one shock absorber and one spring for each suspension location, whereby the shock absorber and the spring are coupled parallel to each other between a lower Dart such as a chassis which supports the suspension and an upper part such as a vehicle cab which is sprung-supported and shock-absorbingly-supported by means of the suspension arrangement, whereby the shock absorber presents a lower fastening for connection to said lower part and an upper fastening for damped connection to said upper part, said upper part presenting a spring member and said suspension arrangement additionally being provided with la lockable coupling arrangement for releasable coupling of the vehicle cab to the suspension arrangement such that the vehicle cab is supported by one or more suspension arrangements via the coupling arrangement which consists of both a first coupling part attached to said upper part and of a second coupling part attached to the suspension arrangement with a lock mechanism for releasable locking of the coupling parts to each other.
STATE OF THE ART
For the suspension of e.g. a truck cab on a chassis, a combination of springs and shock absorbers is normally used whereby the spring's upper fastening is connected to the upper part of the shock absorber. The cab is normally fixed to this by means of a rubber bush. In order that the shock absorber can support the static load, i.e. the intrinsic weight of the cab, the bush has to be designed for this load bearing function. This means in practice that the bush has to be given a very high stiffness. Even if a bush with low stiffness is chosen, which can be obtained e.g. by using a low rubber hardness, the risk is still present that the bush will set after a time and still obtain a high stiffness. The disadvantage with these known, stiff, static load-bearing bushes is that noise is transferred to the cab where the requirements for a good driver environment are being raised ever higher. With high stiffness an undesirable transmittance of chassis noise to the cab occurs. A bush with low stiffness can of course reduce the transmittance of chassis noise to the cab but cannot fulfil the requirements for static load bearing for longer periods of time.
SUMMARY OF THE INVENTION
The object of the present invention is to construct a shock absorbing and sprung suspension arrangement such that the requirements on the load bearing ability concerning static load and the requirements for low chassis noise transmittance can both be fulfilled at the same time.
Said object is achieved by means of a shock absorbing and sprung suspension arrangement which is characterized in that said second coupling part is connected to the suspension arrangement both via said spring element in the shock absorber's upper fastening and via a carrier member which is separate from said fastening and which is arranged in the upper end of the spring, said carrier member being arranged to take the static load acting on the suspension arrangement and thereby statically unload the shock absorber's upper fastening, the spring member of which can thereby be given a well-adapted stiffness which imparts high-grade vibration-isolation characteristics to the suspension arrangement.
DESCRIPTION OF THE FIGURES
The invention will now be described in more detail with reference to an embodiment and the accompanying drawings, in which
FIG. 1 shows a cab suspension which includes suspension arrangements according to a first embodiment of the invention,
FIG. 2 shows, on a larger scale, an exploded view of a cab suspension according to FIG. 1 including a suspension arrangement according to the invention,
FIG. 3 shows a cab suspension including suspension arrangements according to a second embodiment of the invention,
FIG. 4 shows, on a larger scale, an exploded view of a cab suspension arrangement according to FIG. 3 including a suspension arrangement according to the invention, and
FIG. 5 shows a
REFERENCES:
patent: 3397910 (1968-08-01), Schmidt et al.
patent: 3944017 (1976-03-01), Foster
patent: 4452328 (1984-06-01), Oudelaar
patent: 4568067 (1986-02-01), Iwala
patent: 5158269 (1992-10-01), Hein et al.
patent: 5330166 (1994-07-01), Aoki
K arrberg Anders
Ljungholm Bengt
Nilsson Nils
Schill Mikael
Wendeberg Staffan
AB Volvo
Oberleitner Robert J.
Poon Peter M.
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