Spring devices – Vehicle – Lever and nontorsion spring
Patent
1986-03-14
1987-12-15
Halvosa, George E. A.
Spring devices
Vehicle
Lever and nontorsion spring
92 38, 92 42, 92 43, 92 44, 92121, 188298, 188306, 267 6427, 267122, 280705, B60G 1126
Patent
active
047127805
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a hydropneumatic spring suspension or shock-absorbing device for use in suspension systems, such as on heavy duty vehicles.
In a shock-absorbing device of this type known from AS 2 227 139 which incidentally may also be used as an emergency shock-absorbing buffer for elevators, the bellows is of cylindrical shape. Compressed air is admitted the bellows at one end across an abutment and a cylinder secured thereon in which a pneumatic spring is disposed. The pneumatic spring is a metal bellows stressed from the outside across a throttle valve inserted between the chamber for the pneumatic spring inside the cylinder and the spring bellows. The disadvantage here is that installation of the shock absorbing device requires considerable space because the cylinder receiving the pneumatic spring is an extension of the bellows. Since the outer rims of the bellows grind against the housing when deformed, and since the outside of the bellows is reinforced with wire, there is considerable abrasion when the bellows is deformed, thus precluding long-term use of this shock absorbing device. From DE-OS No. 1 655 029, a hydropneumatic shock absorbing device is known for spring suspension between vehicle parts and the chassis, in which a plurality of hydraulic cylinders separated by a diaphragm and throttle points is structurally connected with a gas pressure reservoir. This shock absorbing device is very expensive to build and also requires too much space. Further, its absorption performance makes it only marginally usable in heavy motor vehicles.
The underlying object of the invention is to provide a hydropneumatic spring suspension device of the type indicated which combines an extraordinarily compact construction with low wear and tear and which can be heavily loaded.
In the case of the selected circular arc shape of the spring bellows, the latter in its straight development of the arc has a great operational length which however, due to the circular arc shape, is accommodated in a very narrow space. Nevertheless, the bellows may be extended very vigorously so as to be capable of sustaining heavy loads. Despite the great carrying capacity, the dimensions of the housing are compact, so that the spring suspension device can be used with advantage in a restricted space. The abutment also moving along the circular arc, a wide effective stroke is available without a negative effect on the compactness of the housing measurements. With this construction, wear-and-tear inhibiting provisions may be targeted, so that the spring suspension device may operate continuously even at high loads during a long service life. The compact dimensions of the suspension device are particularly advantageous for suspending chassis parts of heavy vehicles and, in particular, for suspension or shock absorption for supporting rollers of the chains of tracked vehicles, for example of armored cars. In such case, a plurality of support rollers must be supported in particularly cramped conditions, particularly so far as the structural height is concerned.
A particularly compact structure of the spring suspension device is obtained in the device of the instant invention because the individual cooperating components are disposed inside the circle whose arc determines the shape of the bellows. Since no mechanical but merely a flow connection between the bellows and the pneumatic spring is necessary, the spring may with regard to compactness of the suspension device, be practically freely allocated to the bellows.
In practice, in one embodiment which has proved particularly satisfactory, a little more than a semi-circle is occupied by the spring bellows, while the remaining part of the full circle the pneumatic spring.
A compact spring suspension device operating with low wear and tear is realized in one embodiment by eliminating the dynamic seals by structurally combining the bellows with its support and admission elements. Structural units capable of being heavily loaded are thus provided.
The individual segments produce the desir
REFERENCES:
patent: 1936788 (1933-11-01), Hardy
patent: 3002741 (1961-10-01), Akutowicz
patent: 3202061 (1965-08-01), Johnston
patent: 3977648 (1976-08-01), Sigmon
patent: 4156536 (1979-05-01), Brandstadter
Ficht Reinhold
Vilsmeier Walter
Ficht GmbH
Halvosa George E. A.
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