DE102010008723A1 - Throttle control absorber device, particularly for motor vehicle, has valve arrangement having fluid path with course check valve switched between indulgence place and work space - Google Patents

Abstract

The throttle control absorber device has a valve arrangement (15) having a fluid path (19) with a course check valve (21) switched between an indulgence place (17) and a work space (9). The valve arrangement is opened by the course check valve for hydraulic medium flowing from indulgence place to a work space (7) and is closed in reverse direction.

Description

The The invention relates to a gas spring damper device, in particular for a motor vehicle with one with a hydraulic medium filled or fillable cylinder, one slidably mounted within the working cylinder and the Working cylinder in a first working space and a second working space dividing working piston, one of the working piston permanently assigned and in the first working space plunging piston rod, one arranged outside the working cylinder and this hydraulically associated gas-pressure hydraulic compliance point and one between the power cylinder and the compliance point switched valve arrangement by means of at least one property the gas spring damper device adjustable or at least can be influenced.

Gas spring damper devices for motor vehicles are known. These can be designed, for example, as so-called single-pipe dampers or two-pipe dampers. Both operating principles are based on the fact that a gas compensation chamber filled with a compressible medium under pressure transfers compressive forces to a hydraulic medium located in two working chambers. By means of a working piston, which separates the two working spaces from each other, and a piston rod associated therewith spring damping forces can be transmitted, wherein damping by means of valves, which allows an overflow of the hydraulic medium between the working spaces predetermined and / or adjustable. There are gas spring damper devices are known in which the working spaces are associated with each other by means of a separately arranged outside of a working cylinder valve assembly. Furthermore, systems are known in which the gas compensation chamber is arranged outside of the working cylinder. Moreover, it is known to influence properties, for example spring and damping constants, for example by means of adjustable valves. From the DE 195 47 910 C1 a device for influencing characteristics of a vibration damper is known, wherein the vibration damper is connected to a resiliently variable reservoir or compensation chamber, wherein between the piston separated by the working spaces a bypass and a check valve is present, and that within the connection to the reservoir or compensation space adjustable damping valve and an associated check valve is present, wherein both working spaces on a further and between the vibration damper and the existing in the connection to the reservoir or compensation chamber adjustable damping valve and associated check valve controllable damping valve system are provided, wherein the further damping valve system comprises at least two damping valves, and wherein each of the damping valves of the further damping valve system consists of an electromagnetically controllable spool and one with the Steuerschie About flow-parallel or in series pressure-dependent valve consists. The reservoir tank contains a high-pressure gas-filled gas space, the high pressure being transmitted to the entire apparatus. In a compression movement, this pressure is reduced in one of the work spaces.

task the invention is to provide a gas spring damper device, in particular to allow a particularly sensitive response and / or a risk of cavitation during operation to exclude the gas spring damper device or at least to a minimum.

The object is in a gas spring damper device, in particular for a motor vehicle with a cylinder filled or filled with a hydraulic cylinder, a displaceably mounted within the working cylinder and the working cylinder in a first working space and a second working space dividing working piston, one of the working piston permanently assigned and in the first Working space plunging piston rod, arranged outside the working cylinder and hydraulically associated with this Gasdruckbeaufschlagten hydraulic compliance point and a switched between the working cylinder and the compliance point valve assembly by means of at least one property of Gasfederdämpfervorrichtung adjustable or at least influenced is achieved in that the valve arrangement between the yield point and the first working space switched fluid path having a Zugrückschlagventil by means of Zugrück open for the inflow point in the first working space inflowing hydraulic medium and locked in the reverse direction. Advantageously, it can be ensured by means of the fluid path and the Zugrückschlagventils that even with rapid spring movements, in particular a compression movement, the hydraulic medium from the compliance point unhindered flow into the first working space, which advantageously avoids cavitation danger or at least can be reduced to a minimum. Advantageously, by this measure, the gas spring damper device can be operated both in the pulling direction and in the pressure direction in each case with an overpressure which builds up in the working space which is correspondingly smaller. The correspondingly enlarged working space is hydraulically directly assigned to the compliance point, so that the hydraulic medium can flow. In front Partly is thereby possible to select a base pressure of the gas spring damper device comparatively low. The basic pressure is provided by means of the compliancy point or transferred to the hydraulic medium, wherein the compliance point is designed to provide the background pressure and to compensate for a volume displacement of the piston rod immersed in the first working space. For this purpose, the compliance point can be designed as a hydraulic energy store, which stores, for example, in a known manner hydraulic energy in the form of compression energy of a gas cushion and can deliver it again. The compliance point can for this purpose have a separating piston which is displaceably mounted within a cylinder and which separates a gas compensation space from a hydraulic compensation space.

at An embodiment provides that the valve arrangement one connected between the compliance point and the first working space further fluid path having a pressure check valve, the means of the pressure check valve for the yield point in the second working space inflowing Hydraulic fluid is opened and locked in the opposite direction. Advantageously, in a rebound movement, the hydraulic medium flow unhindered into the second working space, so that even with a rebound movement a risk of cavitation in the second working space avoidable or at least reduced to a minimum is.

at a further embodiment of the gas spring damper device is provided that the pressure check valve an adjustable Pressure valve is connected in parallel. Under the pressure valve can for example, a throttle valve, a device throttle valve, a pressure control valve and / or an adjustable throttle valve understood become. Advantageously, by means of the pressure valve, the property for adjusted a compression movement of the gas spring damper device and / or at least influenced.

at a further embodiment of the gas spring damper device is provided that the Zugrückschlagventil an adjustable Pull valve is connected in parallel. The pull valve can be analogous to the pressure valve be designed and adjust the property in the pulling direction or at least influence.

at a further embodiment of the gas spring damper device is provided that the pull check valve, the pressure check valve and a common adjustable valve are connected in parallel. The adjustable valve can be analogous to the pull valve and / or the pressure valve be designed and advantageous due to the parallel circuit both at a pulling direction as well as a pressure direction of the hydraulic medium be flowed through, so this same the property of a tensile movement as well as a pressure movement of the Adjust or at least influence the gas spring damper device can.

at a further embodiment of the gas spring damper device It is envisaged that the working piston between the work spaces switched, in particular adjustable, working piston valve has. The working piston valve can analogously to the pull valve and / or pressure valve be designed, in particular, it may be a Einrichtungsdrosselventil, in particular to act as a passive device throttle valve. Advantageously results between the work spaces of shortest possible fluid path, which affects a transmission behavior, a control and / or control behavior and / or comfort behavior the gas spring damper device has a positive effect.

at a further embodiment of the gas spring damper device It is envisaged that the working piston between the work spaces switched, in particular adjustable, another working piston valve having. The further working piston valve can analogously to the working piston valve be designed, wherein advantageously both in a pulling direction as also in a printing direction, the advantageous properties the gas spring damper device result.

The Task is also in a motor vehicle with a previously described Gas spring damper device solved. It revealed the advantages described above.

Further Advantages, features and details emerge from the following Description in which, where appropriate with reference to the Drawing - at least one embodiment is described in detail. Described and / or illustrated Characteristics form for themselves or in any other, more meaningful Combination the subject of the invention, optionally also independently from the claims, and in particular in addition also Be the subject of one or more separate applications. Same, similar and / or functionally identical parts are provided with the same reference numerals. Show it:

1a a schematic view of a gas spring damper device with Einrichtungsdrosselventilen;

1b in the 1a shown gas spring damper device, but with normal throttle valves;

2a another gas spring damper direction with directional throttle valves;

2 B in the 2a shown gas spring damper device, but with normal throttle valves;

3a a gas spring damper device having a common device throttle valve;

3b in the 3a shown gas spring damper device, but with a normal throttle valve;

4a another gas spring damper device with a working piston valve and a Einrichtungsdrosselventil;

4b in the 4a shown gas spring damper device, but with a normal throttle valve;

5a another gas spring damper device analogous to in 4a in contrast, in which the working piston valve is designed as a device throttle valve;

5b a further embodiment of a gas spring damper device analogous to in 4b in contrast, in which the working piston valve is designed as a device throttle valve;

6a another gas spring damper device analogous to in 5a shown, wherein a further working piston valve is provided; and

6b another gas spring damper device analogous to in 5b shown, in contrast, a further working piston valve is provided.

The 1a to 6b each show a gas spring damper device 1 that can be self-supporting. That is, in parallel to the gas spring damper device 1 a spring, not shown, in particular an air or steel spring, can be arranged. To describe the basic operation of the gas spring damper devices shown 1 will be referred to these figures together in the following:
The gas spring damper device 1 has a working cylinder 3 on. The working cylinder 3 is filled with a hydraulic medium, not shown, for example, a hydraulic oil. Inside the working cylinder 3 is a working piston 5 slidably mounted, the working cylinder 3 in a first workroom 7 and a second workspace 9 divides.

The working piston 5 is a piston rod 11 firmly assigned, with the piston rod 11 in the first workroom 7 dips while displacing a corresponding volume of the hydraulic medium.

By means of the piston rod 11 can Federdämpferkräfte on a partially illustrated motor vehicle 13 be transmitted.

The workrooms 7 . 9 of the working cylinder 3 is a hydraulic valve arrangement 15 downstream. By means of the valve arrangement 15 At least one property of the gas spring damper device can be adjusted or at least influenced.

The valve assembly 15 downstream, the gas spring damper device 1 a gas pressurized compliance point 17 on. Resilience points are known and can act in the form of a hydraulic energy storage damping and / or ensure a volume balance. In the present case, the place of compliance takes 17 the volume displaced by the submerged piston rod. Further, the compliance point 17 pressurized gas and thereby provides a base pressure within the valve assembly 15 and the workspaces 7 . 9 of the working cylinder 3 for sure. The compliance point 17 may for this purpose have a cylindrical interior, which is divided by means of a displaceably mounted therein separating piston in a filled with a gas or a compressible medium, in particular air, gas equalization chamber and filled with the hydraulic medium Hydraulikmediumausgleichsraum.

Advantageously, the compliance point 17 be designed so that it provides a comparatively low base pressure, for example between 0 and 10 bar, in particular between 2 and 8 bar, in particular between 4 and 6 bar, preferably of about 5 bar.

Advantageous This can be a particularly sensitive response and thus Comfort behavior of the gas spring damper device allows become.

The comparatively low base pressure of the gas spring damper device is possible because it is designed in a compression movement, ie in a compression direction as well as a rebound movement, ie in a pulling direction so that the respective relieved working space 7 . 9 from the compliance office 17 is supplied with under the Grundruck stagnant hydraulic medium or this can flow freely.

To make this possible, the valve assembly has 15 one between the pledges 17 and the first workroom 7 switched fluid path 19 with a pull check valve 21 on. The pull check valve 21 is so in the fluid path 19 switched that the hydraulic medium from the compliance point 17 unhindered in the first working space 7 can flow. For the opposite case, so if the first working space 7 reduced, the Zugrückschlagventil locks 21 ,

In addition, the valve assembly 15 one between the pledges 17 and the second workspace 9 connected further fluid path 23 with a pressure check valve 25 on. The pressure check valve 25 is so in the further fluid path 23 switched that in case of a volume increase of the second working space 9 the hydraulic medium unhindered by the compliance point 17 can flow into the second working space. In the opposite case, so with a reduction in volume of the second working space 9 locks the pressure check valve 25 ,

For a more detailed explanation of the valve arrangement 15 in the 1a . 2a . 1b . 2 B shown gas spring damper devices 1 is referred to these figures together:
The pull check valve 21 is a pull valve 27 connected in parallel, by means of a damper work at a pulling movement, ie at a rebound, so with locked draft check valve 21 can be adjusted.

The pressure check valve 25 is a pressure valve 29 connected in parallel, by means of which a damper work during a pressure movement, ie at a compression movement can be adjusted.

According to the 1a are the pull valve 27 and the pressure valve 29 designed as controllable Einrichtungsradrosselventile. Likewise, according to the illustration of 2a , Alternatively, the device throttle valve in the 1a . 2a . 3a . 4a . 5a and 5b be designed as a pressure control valve. Furthermore, the Einrichtungsdrosselventil in the 1a and 2a be supplemented by another pressure control valve.

According to the representations of the 1b and 2 B are the pull valve 27 and the pressure valve 29 designed as adjustable throttle valves. Alternatively and / or additionally, it is possible to combine a Einrichtungsdrosselventil with a throttle valve and / or provide instead of an adjustable variant passive throttle valves and / or Einrichtungsdrosselventile.

According to the 1a and 1b is the valve assembly 15 designed so that it can be realized by means of a common, not shown valve block.

According to the representations of the 2a and 2 B is the valve assembly 15 designed so that the fluid path 19 and the further fluid path 23 as well as the respective switched-hydraulic elements by means of two different hydraulic plates and / or hydraulic units, which in the 2a and 2 B are not shown in detail, can be realized.

According to the representations of the 3a and 3b has the valve assembly 15 instead of the draft valve 27 and the pressure valve 29 only a common valve 31 on that in 3a as a controllable device throttle valve and according to 3b is designed as a controllable throttle valve.

According to the representations of the 3a and 3b is the common valve 31 the pull check valve 21 and pressure check valve 25 connected in parallel. The common valve 31 is the first working space 7 and the second workspace 9 equally downstream and the compliance point 17 upstream. Moreover, each is between the workrooms 7 . 9 and the common valve 31 a check valve connected, wherein these are arranged so that each outflowing hydraulic medium from one of the working dreams 7 . 9 through the common valve 31 but is prevented from doing so, in each other's expanding, thus relieved working space 7 . 9 to flow. It can be seen that this makes the common valve both in the direction of tension and in the direction of pressure 31 in the direction of the respectively filling working space 7 . 9 or, if appropriate, in the direction of the compliance office 17 is flowed through. Advantageously, characterized by means of only a single common valve 31 the gas spring damper device are controlled and / or regulated or a damping property can be adjusted.

The 4a . 4b . 5a . 5b . 6a . 6b also have a valve assembly 15 with a common valve 31 analogous to the representation of 3a and 3b on. In contrast, however, no additional check valves are the work spaces 7 . 9 downstream. Nevertheless, a controlled overflow of the hydraulic medium between the first working space 7 and the second workspace 9 to ensure, is in accordance with 4a . 4b . 5a . 5b a working piston valve 33 provided as part of the working piston 5 the first workroom 7 and the second workspace 9 connects hydraulically. According to the presentation of the 4a is the working piston valve 33 designed as a controllable throttle valve. According to the representations of the 5a and 5b such as 6a and 6b is the working piston valve 33 designed as a controllable Einrichtungsdrosselventil that for overflow of the hydraulic medium of the ers working space 7 in the second workspace 9 opened and closed in the opposite direction.

According to the representations of the 6a and 6b is in addition to the working piston valve 33 another working piston valve 35 provided that is also designed as a controllable Einrichtungsdrosselventil, but this exactly in the opposite as the working piston valve 33 opens. The further working piston valve 35 So is for from the second workspace 9 in the first workroom 7 flowing hydraulic medium open and closed in the reverse direction.

According to the 4a is the common valve 31 designed as a controllable Einrichtungsdrosselventil, wherein during a pressure movement, a partial flow of the hydraulic medium from the first working space 7 in the second workspace 9 via the working piston valve 33 flows. Another volume fraction is via the common valve 31 the compliance office 17 fed. In the reverse direction, ie in a rebound movement, is also a partial flow of the hydraulic medium from the second working space 9 in the first workroom 7 via the working piston valve 33 guided. A corresponding increase in volume of the workrooms 7 and 9 due to the exiting piston rod 11 is caused by an unimpeded flow of the hydraulic medium from the compliance point 17 via the pressure check valve 25 the further fluid path 23 balanced.

According to the presentation of the 4a is the common valve 31 designed as a controllable device throttle valve. According to the presentation of the 4b is the common valve 31 designed as a controllable throttle valve.

The design of the common valve 31 of the 5a and the 6a corresponds to the interpretation of 4a , The design of the common valve 31 of the 5b and 6b corresponds to the interpretation according to 4b ,

According to the 5a and 5b is the working piston valve 33 only in one direction of flow, so that during a compression movement, ie in the pressure direction of the entire flow of the hydraulic medium, due to the reduction in volume of the second working space 9 arises, via the common valve 31 to be led. In the opposite direction, the total volume flow, due to the reduction in volume of the first working space 7 created, via the working piston valve 33 guided.

The gas spring damper device 1 according to the 6a and 6b additionally has the additional working piston valve 35 on, which is also designed as a controllable Einrichtungshrrosselventil. The further working piston valve 35 is switched so that it in the pulling direction, so with a reduction in volume of the first working space 7 closed is. Consequently, the volume flows in a rebound movement analogous to the gas spring damper devices 1 of the 5a and 5b , referring to the description of the 5a and 5b is referenced. In the reverse direction, ie with a reduction in volume of the second working space 9 , In addition, a partial flow through the other working piston valve 35 in the first workroom 7 flow. Another partial flow is via the common valve 31 the compliance office 17 fed.

Advantageously, the compensation gas space of the compliance point 17 through the valve assembly 15 , which in particular has throttle valves and check valves of both working spaces 7 . 9 the gas spring damper device 1 separated, with advantageous corresponding damping forces of the gas spring damper device 1 can be generated by overpressure. Thus, it becomes advantageous to generate a pressure difference between the working spaces 7 . 9 no negative pressure generated, with a Kavitationsgefahr, in particular in the piston rod 11 remote, so active in a pressure movement, the second working chamber 9 no danger of cavitation exists. The second working chamber 9 may also be referred to as Radeinfederdämpfungsarbeitskammer. Advantageously, a low base pressure in the work spaces 7 . 9 be set, this advantageously advantageous comfort, in particular by a lower sealing friction, in particular on a not-shown seal between the working cylinder 3 and the piston rod 11 ,

All adjustable and / or controllable valves of the valve assembly 15 can be configured so that they are normally hard or almost closed, whereby a high damping, coupled with a high driving safety is set, which is advantageous in case of electrical failure, a good case-safe behavior of the gas spring damper device 1 conditionally.

Alternatively and / or additionally, it is conceivable that in the different alternatives of 1a and 6b illustrated controllable and / or adjustable valves to combine with each other, in particular to combine these with conventional fixed preset valves, such as throttles. Furthermore, it is conceivable to alternatively and / or additionally replace one or more of the throttle valves by pressure control valves.

According to the 6a and 6b advantageously result in comparatively short hydraulic fluid paths, wherein a damping effect, which is caused by the fluid paths themselves, can be advantageously minimized.

Alternatively and / or additionally, it is possible in the working piston 5 additionally to provide passive pull and pressure plate valves.

1

Gas spring damper device

3

working cylinder

5

working piston

7

first working space

9

second working space

11

piston rod

13

motor vehicle

15

valve assembly

17

compliance point

19

fluid path

21

Zugrückschlagventil

23

fluid path

25

Pressure check valve

27

pull valve

29

pressure valve

31

Valve

33

Working piston valve

35

Working piston valve

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19547910 C1 [0002]

Claims (8)

Gas spring damper device ( 1 ), in particular for a motor vehicle ( 13 ), comprising: - a working cylinder filled or to be filled with a hydraulic medium ( 3 ), - one within the working cylinder ( 3 ) displaceably mounted and the working cylinder ( 3 ) into a first workroom ( 7 ) and a second workspace ( 9 ) dividing working piston ( 5 ), - one of the working piston ( 5 ) and into the first workspace ( 7 ) submerged piston rod ( 11 ), - one outside the working cylinder ( 3 ) and this hydraulically associated Gasdruckbeaufschlagten hydraulic yield point ( 17 ), - one between the working cylinders ( 3 ) and the compliance office ( 17 ) connected valve arrangement ( 15 ) by means of the at least one property of the gas spring damper device ( 1 ) is adjustable or at least influenced, characterized in that the valve arrangement ( 15 ) between the compliance office ( 17 ) and the first workspace ( 9 ) switched fluid path ( 19 ) with a pull check valve ( 21 ), which by means of the Zugrückschlagventils ( 21 ) for the compliance office ( 17 ) in the first workspace ( 7 ) inflowing hydraulic medium is opened and locked in the reverse direction. Gas spring damper device ( 19 ) according to the preceding claim, characterized in that the valve arrangement ( 15 ) between the compliance office ( 17 ) and the second workspace ( 9 ) connected further fluid path ( 23 ) with a pressure check valve ( 25 ), which by means of the pressure check valve ( 25 ) for the compliance office ( 17 ) into the second workspace ( 9 ) inflowing hydraulic medium is opened and locked in the reverse direction. Gas spring damper device ( 1 ) according to the preceding claim, characterized in that the pressure check valve ( 25 ) an adjustable pressure valve ( 29 ) is connected in parallel. Gas spring damper device ( 1 ) according to one of the preceding claims, characterized in that the pull check valve ( 21 ) an adjustable draft valve ( 27 ) is connected in parallel. Gas spring damper device ( 1 ) according to one of the preceding claims, characterized in that the pull check valve ( 21 ), the pressure check valve ( 25 ) and a common, in particular adjustable, valve ( 31 ) are connected in parallel. Gas spring damper device ( 1 ) according to one of the preceding claims, characterized in that the working piston ( 5 ) between the workspaces ( 7 . 9 ), in particular adjustable working piston valve ( 33 ) having. Gas spring damper device ( 1 ) according to one of the preceding claims, characterized in that the working piston ( 5 ) between the workspaces ( 7 . 9 ), in particular adjustable, another working piston valve ( 35 ) having. Motor vehicle ( 13 ) with a gas spring damper device ( 1 ) according to any one of the preceding claims.