Spring devices – Vehicle – Comprising compressible fluid
Patent
1995-09-26
1996-12-03
Oberleitner, Robert J.
Spring devices
Vehicle
Comprising compressible fluid
267121, 267135, F16F 1300
Patent
active
055800327
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an arrangement for a gas spring consisting of an outer cylindrical casing with a sealing end wall at either end, one of which has an axial bore for a piston rod passing through the bore, which piston rod is connected to a piston moving axially in the interior of the casing, in conjunction with which the arrangement consists of an annular cylindrical body made of an elastic material, the outer cylindrical wall of which is operatively connected to the casing in a sealing fashion, and the inner cylindrical wall of which is operatively connected to the piston in a sealing fashion, in conjunction with which a certain gas pressure prevails in the space defined by one of the cylindrical walls of the casing, the second end wall and the piston and the annular surface of the end wall of the annular cylindrical body facing away from the end wall executed with a bore.
BACKGROUND OF THE INVENTION
Gas springs are now highly familiar constructional elements, which are used successfully in many applications in place of conventional helical springs, for example.
One disadvantage is that a gas spring is only capable of withstanding approx. 4-5 million spring cycles; the gas spring must then be renovated, in conjunction with which the seals, amongst other things, will require replacement.
Previously disclosed through WO 90/14528 is a double gas spring with two pistons capable of moving axially inside a cylinder. In order to avoid leakage between the cylinder and the respective piston, there is present an annular cylindrical body made of an elastic material which is connected to the cylinder and the respective piston in a sealing fashion. The gas spring lacks end walls serving as guides for the piston, and there is thus no risk of increased wear occurring between these and the aforementioned annular cylindrical bodies, which would reduce the service life.
SUMMARY OF THE INVENTION
The object of the present invention is to make available a gas spring of the kind referred to by way of introduction, which is capable of withstanding approximately ten times more spring cycles than previously disclosed gas springs, and at a cycle frequency of up to 70 Hz.
This is achieved in accordance with the invention in that a metal tube is attached to the respective cylindrical surfaces of the annular cylindrical body, which metal tube projects beyond the body in a direction towards the end wall executed with a bore and in so doing defines an annular cylindrical space together with the aforementioned end wall.
As can be appreciated from a particular characteristic of the invention, a static seal acts as a satisfactory possible seal for the aforementioned space between the cylindrical surfaces of the annular cylindrical body and the piston and the inner wall surface of the casing.
As can be appreciated from a further particular characteristic of the invention, the operative connection between the annular cylindrical body and the piston consists of an annular flange arranged thereon, which is so arranged as to be in engagement with the edge surface of the metal tube facing towards the end wall executed with a bore, and the operative connection between the body and the cylindrical wall of the casing is a frictional engagement supported by the aforementioned gas pressure.
In order further to increase the service life, the edge of the annular flange facing towards the annular cylindrical body is rounded.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described below in greater detail with reference to the accompanying drawing, which illustrates the arrangement in accordance with the invention schematically as a longitudinal view.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The designation 1 is used generally in the drawing in respect of a gas spring consisting of a cylindrical casing la with sealing end walls 1b, 1c. The end wall 1b and the cylindrical casing 1a are preferably manufactured in a single piece.
The end wall 1c, on the other hand, is fixed in the casing 1a in
REFERENCES:
patent: 2282312 (1942-05-01), Halstead
patent: 2457749 (1948-12-01), Thiry
patent: 2973953 (1961-03-01), Fikse
patent: 3191964 (1965-06-01), Chambers
patent: 3743059 (1973-07-01), Morse et al.
patent: 4662791 (1987-05-01), Spicer
patent: 5277281 (1994-01-01), Carlson et al.
Oberleitner Robert J.
Schwartz Chris
Stromsholmens Mekaniska Verkstad AB
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