Pneumatic spring system

Details Pneumatic spring system Pneumatic spring system

1999-10-27

2001-06-19

Lopez, F. Daniel (Department: 3745)

Power plants

Pressure fluid source and motor

Pneumatic motor with gas supply or removal device

C091S432000, C251S149200

Reexamination Certificate

active

06247306

ABSTRACT:

The invention relates to a pneumatic spring system comprising at least one pneumatic spring at least consisting of a pneumatic spring cap as an upper component; a pneumatic spring bellows made of elastomeric material, said bellows connecting the two opposite elements with the help of fastening elements, whereby the bellows can roll off within its roll-off zone on the outer wall of the piston, forming an interior space having elasticity of volume; at least one control valve, in particular in the form of a solenoid valve; as well as a compressor with integrated residual pressure-maintaining function.
So as to allow superior installation in the vehicle or for protecting the pneumatic spring system against operating without pressure, pneumatic valves are employed especially in passenger motor vehicles. Such valves have the function of closing when the pressure of the pneumatic spring falls short of a defined value (residual pressure-maintaining function). With such a type of valve it is possible to cover the cases mentioned above.
U.S. Pat. No. 4,671,323 describes a pneumatic spring system provided with a releasable check valve, reference being made especially to
FIGS. 2
to
6
regarding the constructional details and functional principle of the valve.
However, compressors are employed in pneumatic spring systems for passenger motor vehicles as well, such compressors having a residual pressure-maintaining function on their part.
Now, by combining the releasable check valve as defined by the invention in the characteristic part of patent claim
1
, with the residual pressure-maintaining valve installed in the compressor it is possible to cover the above-mentioned cases as well. Prefilling of the pneumatic spring (for example for installation purposes) is achieved through the nonreturn function.
The advantages offered by the check valve as defined by the invention over a residual pressure valve include the simpler and more favorable structure in terms of cost, the improved tightness, as well as the extensive independence of the function of temperature, age etc.
Useful configurations of the check valve as defined by the invention are specified in claims
2
,
3
,
5
-
7
, and
10
-
15
.


REFERENCES:
patent: 4671323 (1987-06-01), Buma
patent: 5328005 (1994-07-01), Van Breemen
patent: 5467595 (1995-11-01), Smith
patent: 5613663 (1997-03-01), Schmidt et al.
patent: 44 38 192 (1996-05-01), None
patent: 0 178 245 (1986-04-01), None

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