GB2164118A - Temperature-compensated gas spring - Google Patents
Temperature-compensated gas spring Download PDFInfo
- Publication number
- GB2164118A GB2164118A GB08521508A GB8521508A GB2164118A GB 2164118 A GB2164118 A GB 2164118A GB 08521508 A GB08521508 A GB 08521508A GB 8521508 A GB8521508 A GB 8521508A GB 2164118 A GB2164118 A GB 2164118A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure chamber
- piston rod
- temperature
- gas spring
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
- F16F9/0209—Telescopic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
- F16F9/52—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics in case of change of temperature
Abstract
A temperature-compensated gas spring of simple assembly, which comprises a main pressure chamber 6 and an auxiliary pressure chamber 7, is obtained in that an auxiliary fixed partition 8 and seal 9 traversed by the piston rod 4 is arranged in the cylinder between the main pressure chamber and the auxiliary pressure chamber. The piston rod itself is formed from two cylindrical sections with the cylindrical section allocated to the main pressure chamber having a larger cross-sectional area than the cylindrical section 5 allocated to the auxiliary pressure chamber. In this way a temperature-compensated gas spring of single-tube construction type is disclosed which moreover can carry out damped piston rod movements since, by reason of this form of embodiment, the piston rod can be provided with a damping piston. <IMAGE>
Description
SPECIFICATION
Temperature-compensated gas spring
The invention relates to a temperature-compensated gas spring which comprises a main pressure chamber and an auxiliary pressure chamber, in accordance with the opening statement of Claim 1.
Such a temperature-compensated gas spring is known from Fed. German Publ. Spec. No.
3,324,214. In this case the main pressure chamber is separated from the auxiliary pressure chamber by the piston guided in sealed manner in the cylinder, and in addition to the cylinder a container surrounding the latter is necessary. Damping of the inward and outward thrust movements of the piston rod is not intended, and cannot be achieved with simple means in this construction. Moreover the dynamic sealing of the two gas chambers can be mastered only with a sealing eiement of very expensive formation, and the friction occurring between the piston seal and the cylinder cannot readily be kept within narrower limits.
It is the problem of the present invention to produce a temperature-compensated gas spring which avoids the disadvantages of the known constructions, is simple in assembly and worth its price in production, possesses high operational reliability and permits damping for the piston rod movement in a simple manner.
This problem is solved by the invention in that an axially fixed partition and seal penetrated by the piston rod is arranged in the cylinder between the main pressure chamber and the auxiliary pressure chamber and the piston rod is formed from two cylindrical sections, with the cylindrical section allocated to the main pressure chamber having a larger cross-sectional area than the cylindrical section allocated to the auxiliary pressure chamber, while the piston connected with the piston rod is formed as damping piston. Thus it becomes possible in a simple manner to make the temperature-compensated gas spring of single-tube construction and only one sealing element has to be provided, which on the one hand forms the dynamic seal to the piston rod and on the other hand is effective as static seal on the cylinder wall.In this case the pressure prevailing in the main pressure chamber, multiplied by the cross-sectional area of the piston rod, acts as outward thrust force, while the gas pressure prevailing in the auxiliary pressure chamber acts upon the area of difference between the cylindrical sections of the piston rod and acts against the outward thrust force generated by the main pressure chamber. Here the forces exerted upon the piston rod as a result of temperature variation in the main pressure chamber and the auxiliary pressure chamber are so adapted to one another than in a relatively large temperature range no force variation, or at least no appreciable force variation, occurs on the piston rod. Furthermore in a simple way it is rendered possible for a damping device, formed by a damping piston, to be provided for the outward thrust movement especially of the piston rod.This damping piston can be aranged equally as well in the main pressure chamber as in the auxiliary pressure chamber.
A very simple and operationally reliable formation of the temperature-compensated gas spring is obtained according to a feature in that the partition arranged between the main pressure chamber and the auxiliary pressure chamber is formed as a piston rod guide. This achieves a good centring of the piston rod section and thus low stressing of the dynamically acting piston rod seal. Furthermore according to a feature the seal between the main pressure chamber and the auxiliary pressure chamber is achieved in that, as shown by the invention, the seal arranged between the pressure chambers is formed by a sealing ring which forms the piston rod seal with the internal diameter, while the external diameter rests in sealing manner on the inner wall of the cylinder.
In further development of the invention the piston rod, formed from two cylindrical sections, consists of two piston rod components which are joined together by means of an axially fixed connection. In order to obtain good operational reliability of the gas spring with minimum possible friction the axially fixed connection of the piston rod components is formed as an articulation and the piston rod component having the larger cross-sectional area comprises an extension of sleeve form in which a connection head engages which is arranged on the other piston rod component.
Stressing and thus increased friction between the gas spring components which are movable in relation to one another is thus avoided in a simple manner.
A very good seal between the main pressure chamber and the auxiliary pressure chamber is achieved in accordance with the invention in that an oil reserve is arranged on the main pressure chamber side in the region of the sealing ring, and according to one feature the oil reserve is sealed off from the main pressure chamber by means of a separator piston. In this way the sealing ring can be of very simple formation, and an extremely lowfriction and wear-resistant dynamic seal of the piston rod is achieved. In order to make the introduction of the oil into the oil reserve in assembly simple, in accordance with the invention a distance ring is arranged between the separator piston and the sealing ring.
A further improvement of the guide for the piston rod is achieved, as shown by the invention, in that the piston rod component provided with smaller diameter is provided in the region of the connection point with a guide ring. As already mentioned, this guide ring can be formed as damping piston. Likewise it is readily conceivable that in gas springs which serve at the same time as conductors for electric current, the guide ring is provided with a slip contact sliding on the inner wall of the cylinder.
The invention will be explained in greater detail below by reference to the examples of embodiment as represented in the drawing, wherein:
Figure 1 shows a temperature-compensated gas spring in longitudinal section;
Figure 2 shows a detail of a temperaturecompensated gas spring in the region of the partition between main pressure chamber and auxiliary pressure chamber.
The temperature-compensated gas spring as shown in Fig. 1 comprises a cylinder 1 in which there slides a piston 2 connected with a piston rod 3. This piston rod 3 possesses a cylindrical section 4 with larger diameter than a further cylindrical section 5. A partition 8 and a seal 9 traversed by the cylindrical section 4 of the piston rod 3 are arranged between a main pressure chamber 6, which preferably comprises a nitrogen gas filling under pressure, and an auxiliary pressure chamber 7.
At the piston rod exit end a piston rod guide and a piston rod seal for the cylindrical section 5 are provided in the cylinder 1. The auxiliary pressure chamber 7 is filled with a two-phase system which is formed preferably by what is called liquid gas and in which the liquid phase and the vapour phase are in equilibrium. From the main pressure chamber 6 an outward thrust force is exerted upon the piston rod 3, which force corresponds to the product of pressure multiplied by cross-sectional area of the cylindrical section 4. This outward thrust force is opposed, from the auxiliary pressure chamber 7, by a force which corresponds to the difference of cross-sectional areas of the cylindrical sections 4 and 5 multiplied by the pressure in the auxiliary pressure chamber 7.The dimensions are here so adapted to one another that the pressure variations in the main pressure chamber 6 and auxiliary pressure chamber 7 as a result of temperature variation in a range from -300C.
to +80"C. result in no, or at least no appreciable, force variation in regard to the outward thrust force of the piston rod 3. The piston rod 3 consists preferably of two piston rod components. The one piston rod component forms the cylindrical section 4 and has an extension 12 of sleeve form in which there engages a connection head 13 of the second component representing the cylindrical section 5 and the two piston rod components at this point possess an axially fixed connection 11 which is formed for example by crimping over the sleeve end 12. The connection between the extension 12 of sleeve form and the connection head 13 can be made limitedly articulated so that thus slight faults in alignment between the cylindrical section 4 and the cylindrical section 5 can be compensated.
Since the partition 8 is provided with a guide bore 10 adapted to the external diameter of the cylindrical section 4, the seal 9, which is formed as sealing ring, does not have to take up any appreciable movement in the radial direction of the cylindrical section 4. In order to seal off the main pressure chamber 6 satisfactorily from the auxiliary pressure chamber 7 without need to make high -demands of the seal 9, an oil reserve 14 is provided which is sealed off from the main pressure chamber 6 by means of a separator piston 15. In order to facilitate the introduction of the oil into the oil reserve 14 in assembly, a distance ring 16 is provided between the seal 9 and the separator piston 15.For the exact guidance of the cylindrical section 5 of the piston rod 3 in the cylinder 1 a guide ring 17 is provided which is connected with the cylindrical section 5 in the region of the axially fixed connection 11.
Especially for the damping of the outward thrust movement of the piston rod 3 out of the cylinder 1, the damping piston 2 is secured on the end of the cylindrical section 4.
This damping piston 2 comprises a constantly opened labyrinth-type connection opening while a piston ring movable axially in the piston groove opens a further, larger cross-section only in the pushing of the piston rod into the cylinder. In the outward thrust of the gas spring this piston ring closes the additional cross-section so that only the-constantly opened labyrinth-type connection is effective between the main pressure chamber on the piston rod side and the main pressure chamber on the cylinder head side, and thus the outward thrust movement of the piston rod is damped.
This temperature-compensated gas spring can also be used as conductor for the electric current, by means of a slip contact 18 which is arranged on the piston 2. This double function, namely gas spring and current conductor, known in ordinary gas springs, is accordingly readily possible equally in a temperature-compensating gas spring of such construction. Fig.
2 shows a further embodiment for the arrangement of the slip contact. In this case a slip contact 19 is connected with the guide ring 17 by means of a securing ring 20. Such a formation is especially favourable since no sealing component slides on the inner wall of the cylinder 1 in the region in which the guide ring 17 and thus also the slip contact 19 slide.
The Fed. German Publ. Spec. No.
3,324,214 corresponds to the following Patent applications and Patents in other countries:
U.S.A. 413,214 of 30.08.1982
France 83 13 937
Italy 67907-A/83
Spain 525.206 (Patent)
Great Britain 83 21 891
Japan 150 467/83
Korea 4009/83
Australia 18020/83
Brazil PI 83 04 717
Mexico 198.263
Argentina 230.871 (Patent)
The British Patent 83 21 981 as mentioned above has been published under Publ. No.
2,126,316.
For a further disclosure of possible filling media it is referred to the Fed. German Publ.
Spec. No. 3,324,214 and the above-listed corresponding Patent applications and Patents outside Germany.
A damping piston with labyrinth passage and with valve means responsive to the direction of axial movement is disclosed e. g. in
U.S. Patent 4,466,514.
While a specific embodiment of the invention has been shown and described in detail to illustrate the application of the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.
The reference numerals in the claims are only used for facilitating the understanding and are by no means restrictive.
Claims (11)
1. Temperature-compensated gas spring comprising a main pressure chamber and an auxiliary pressure chamber which are sealed off from one another, where a piston arranged in a cylinder is connected with a piston rod and the main pressure chamber comprises a gas filling under pressure which exerts a greater force upon the piston rod than does the gas pressure prevailing in the auxiliary pressure chamber, which pressure is preferably formed by a two-phase system in which the liquid phase and the vapour phase are in equilibrium, while the pressure variations in the main pressure chamber and in the auxiliary pressure chamber resulting from temperature variation are so adapted to one another that no, or at least no appreciable, force variation occurs on the piston rod, characterised in that an axially fixed partition (8) and seal (9) traversed by the piston rod (3) are arranged in the cylinder (1) between the main pressure chamber (6) and the auxiliary pressure chamber (7) and the piston rod (3) is formed from two cylindrical sections (4, 5) with the cylindrical section (4) allocated to the main pressure chamber (6) having a larger cross-sectional area than the cylindrical section (5) allocated to the auxiliary pressure chamber (7), while the piston (2) connected with the piston rod (3) is formed as damping piston.
2. Temperature-compensated gas spring according to Claim 1, characterised in that the partition (8) arranged between the main pressure chamber (6) and the auxiliary pressure chamber (7) is formed as piston rod guide (guide bore 10).
3. Temperature-compensated gas spring according to Claims 1 and 2, characterised in that the seal (9) arranged between the main pressure chamber (6) and the auxiliary pressure chamber (7) is formed by a sealing ring which forms a piston rod seal with the internal diameter, while the external diameter rests in sealing manner against the inner wall of the cylinder (1).
4. Temperature-compensated gas spring according to Claims 1 to 3, characterised in that the piston rod (3), formed from two cylindrical sections (4, 5), consists of two piston rod components which are joined together by means of an axially fixed connection (11).
5. Temperature-compensated gas spring according to Claims 1 to 4, characterised in that the axially fixed connection (11) is formed as an articulation while the piston rod component (cylindrical section 4) having the larger cross-sectional area comprises an extension (12) of sleeve form in which there engages a connection head (13) arranged on the other piston rod component (cylindrical section 5).
6. Temperature-compensated gas spring according to Claims 1 to 5, characterised in that on the main pressure chamber side an oil reserve (14) is arranged in the region of the sealing ring (seal 9).
7. Temperature-compensated gas spring according to Claims 1 to 6, characterised in that the oil reserve (14) is sealed off from the main pressure chamber (6) by means of a separator piston (15).
8. Temperature-compensated gas spring according to Claims 1 to 7, characterised in that a distance ring (16) is arranged between the separator piston (15) and the sealing ring (seal 9).
9. Temperature-compensated gas spring according to Claims 1 to 8, characterised in that the piston rod component (cylindrical section 5) provided with the smaller diameter is provided with a guide ring (17) in the region of the axially fixed connection (11).
10. Temperature-compensated gas spring according to Claims 1 to 9, characterised in that the guide ring (17) is provided with a slip contact (19) sliding on the inner wall of the cylinder (1).
11. Temperature-compensated gas spring as claimed in Claim 1, substantially as described herein with reference to and as illustrated by any one of the examples shown in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19843432605 DE3432605A1 (en) | 1984-09-05 | 1984-09-05 | TEMPERATURE COMPENSATED GAS SPRINGS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8521508D0 GB8521508D0 (en) | 1985-10-02 |
| GB2164118A true GB2164118A (en) | 1986-03-12 |
| GB2164118B GB2164118B (en) | 1987-09-16 |
Family
ID=6244685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08521508A Expired GB2164118B (en) | 1984-09-05 | 1985-08-29 | Temperature-compensated gas spring |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS6165927A (en) |
| AU (1) | AU567405B2 (en) |
| BR (1) | BR8504282A (en) |
| DE (1) | DE3432605A1 (en) |
| ES (1) | ES8701936A1 (en) |
| FR (1) | FR2569801A1 (en) |
| GB (1) | GB2164118B (en) |
| IT (2) | IT8553742V0 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0344785A2 (en) * | 1988-06-03 | 1989-12-06 | Stabilus GmbH | A gas spring having a plurality of pressure chambers arranged one behind another |
| FR2694612A1 (en) * | 1992-08-07 | 1994-02-11 | Suspa Compart Ag | Piston-piston rod assembly of an adjustable length gas spring. |
| US5862893A (en) * | 1995-09-26 | 1999-01-26 | Stabilus Gmbh | Fluid strut for a motor vehicle |
| WO2002012750A3 (en) * | 2000-08-03 | 2002-04-25 | Lord Corp | Height adjustment mechanism |
| CN101469586B (en) * | 2007-12-28 | 2013-04-17 | 盖泽工业（天津）有限公司 | Driving device for leaf of door or window |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991003664A1 (en) * | 1989-09-11 | 1991-03-21 | Stabilus Gmbh | Self-blocking gas spring with temperature-responsive bypass valve |
| DE4135295A1 (en) * | 1991-10-25 | 1993-04-29 | David & Baader Dbk Spezfab | GAS SPRING |
| JP2006010001A (en) * | 2004-06-28 | 2006-01-12 | Fuji Latex Kk | Shock absorber |
| DE102005013413A1 (en) * | 2005-03-23 | 2006-10-05 | Stabilus Gmbh | Gas spring for use in motor vehicle, uses temperature drop and volume rise of incompressible balance medium e.g. water, to reduce volume of one of gas working spaces inside closed cylinder |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1205498A (en) * | 1982-08-30 | 1986-06-03 | Richard C. Smith | Temperature compensated gas spring |
| DE3432604A1 (en) * | 1984-09-05 | 1986-03-13 | Stabilus Gmbh, 5400 Koblenz | TEMPERATURE COMPENSATED GAS SPRINGS |
-
1984
- 1984-09-05 DE DE19843432605 patent/DE3432605A1/en not_active Withdrawn
-
1985
- 1985-08-29 GB GB08521508A patent/GB2164118B/en not_active Expired
- 1985-08-30 AU AU46915/85A patent/AU567405B2/en not_active Ceased
- 1985-09-03 FR FR8513363A patent/FR2569801A1/en not_active Withdrawn
- 1985-09-04 IT IT8553742U patent/IT8553742V0/en unknown
- 1985-09-04 BR BR8504282A patent/BR8504282A/en unknown
- 1985-09-04 ES ES546717A patent/ES8701936A1/en not_active Expired
- 1985-09-04 IT IT67752/85A patent/IT1183941B/en active
- 1985-09-05 JP JP60195009A patent/JPS6165927A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0344785A2 (en) * | 1988-06-03 | 1989-12-06 | Stabilus GmbH | A gas spring having a plurality of pressure chambers arranged one behind another |
| EP0344785A3 (en) * | 1988-06-03 | 1990-10-10 | Stabilus Gmbh | A gas spring having a plurality of pressure chambers arranged one behind another |
| FR2694612A1 (en) * | 1992-08-07 | 1994-02-11 | Suspa Compart Ag | Piston-piston rod assembly of an adjustable length gas spring. |
| US5862893A (en) * | 1995-09-26 | 1999-01-26 | Stabilus Gmbh | Fluid strut for a motor vehicle |
| WO2002012750A3 (en) * | 2000-08-03 | 2002-04-25 | Lord Corp | Height adjustment mechanism |
| CN101469586B (en) * | 2007-12-28 | 2013-04-17 | 盖泽工业（天津）有限公司 | Driving device for leaf of door or window |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6165927A (en) | 1986-04-04 |
| BR8504282A (en) | 1986-06-17 |
| AU4691585A (en) | 1986-03-13 |
| AU567405B2 (en) | 1987-11-19 |
| GB2164118B (en) | 1987-09-16 |
| IT8567752A0 (en) | 1985-09-04 |
| ES8701936A1 (en) | 1986-12-01 |
| DE3432605A1 (en) | 1986-03-13 |
| FR2569801A1 (en) | 1986-03-07 |
| ES546717A0 (en) | 1986-12-01 |
| IT8553742V0 (en) | 1985-09-04 |
| IT1183941B (en) | 1987-10-22 |
| GB8521508D0 (en) | 1985-10-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |