DE102010011688A1 - Gas spring damper device for motor vehicle, has resilience point comprising energy storage for storing portion of hydraulic energy, where energy is provided during insertion movement along path portion of spring path - Google Patents

Abstract

The device (1) has a resilience point (21) comprising a gas compensation chamber that is filled with a compressible medium, and hydraulically assigned to working chambers (13, 15). A portion of hydraulic energy is stored by the point by a compressible medium, where the energy is changed by the point during immersion movement. The point comprises an energy storage for storing another portion of hydraulic energy, where the energy is provided during insertion movement along a path portion (35) of a spring path (23). The energy storage comprises a polymer spring (33).

Description

The The invention relates to a gas spring damper device, in particular for a motor vehicle, with a working cylinder, a displaceable within the working space along a spring travel stored and the working piston in one with a hydraulic medium filled or fillable first working space and one filled or filled with the hydraulic medium second working space dividing working piston, one of the working piston firmly assigned and immersed in the first working space piston rod by means of along the spring travel in a plunge motion hydraulic energy in the gas spring damper device can be introduced and a at least one of the work spaces hydraulically assigned and one filled with a compressible medium or Fillable gas compensation space having yield point means the at least a subset of the recoverable during the immersion movement hydraulic energy convertible, in particular by means of the compressible Medium is storable, is.

Gas spring damper devices for motor vehicles are known. these can for example, as so-called single-pipe damper or two-pipe damper be executed. Both principles are based on that one with a compressible medium that is under pressure, filled gas compensation chamber compression forces transfers to a located in two working chambers hydraulic medium. By means of a working piston, the two working spaces separated from each other and a piston rod associated therewith can transmit spring damping forces be, with a damping by means of valves that overflow allows the hydraulic medium between the working spaces can be predetermined and / or adjustable. It is also known in the end a spring travel of the working piston energy absorbing buffer provided.

The DE 34 25 988 A1 relates to an adjustable hydraulic shock absorber, wherein for adjusting the damping forces of the damping piston on the damper valves for the rebound and for the pressure stage facing sides each having at least one recess which is connected via an outflow or an inlet bore with the cavity of the piston rod, wherein via a flow channel and above the damping piston arranged transverse bores and provided below the piston rod valve, the damping valves of both the train and the pressure stage can be influenced accordingly. It should be possible to adjust the damping forces both at low and at medium piston speed.

task The invention is an improved gas spring damper device to provide, in particular a gas spring damper device with a strongly progressive characteristic in the area of one end of a Suspension travel.

The Task is with a gas spring damper device, in particular for a motor vehicle, with a working cylinder, a displaceable within the working space along a spring travel stored and the working piston in one with a hydraulic medium filled or fillable first working space and one filled or filled with the hydraulic medium second working space dividing working piston, one of the working piston firmly assigned and immersed in the first working space piston rod by means of along the spring travel in a plunge motion hydraulic energy in the gas spring damper device can be introduced and a at least one of the work spaces hydraulically assigned and one filled with a compressible medium or Fillable gas compensation space having yield point means the at least a subset of the recoverable during the immersion movement hydraulic energy convertible, in particular by means of the compressible Can be stored medium, is solved by the yield point having an additional energy storage means of the In addition, a further subset of the immersion movement along a partial path of the spring travel einbringbaren hydraulic Energy is storable. Advantageously, along the part of the way additional subset be converted. Under walking can For example, a conversion into heat energy and / or a other recoverable forms of energy are understood for example in the form of compression energy, potential energy and / or spring energy. It is advantageous because of the additional Energy conversion along the partial path of the suspension travel increased Force required to insert the piston rod. Advantageous can the partial path in the region of an end position of the working piston and the piston rod, in which they are completely compressed Condition are, lie. Advantageously, so can reach shortly before the end position when passing through the partial travel of the spring travel increased Force be exerted on the piston rod. Advantageous this can be exploited for example in a motor vehicle, around adjacent, forces of the spring damper device spare receiving parts, especially if a so-called Bouncing, so a striking due to a very fast and feared or occurred. Advantageously, a resulting force curve can be equalized be that a maximum force occurring can be reduced. Advantageously, the corresponding force-absorbing parts of the motor vehicle on this reduced maximum force, ie a total be designed weaker.

at an embodiment of the gas spring damper device it is provided that the energy store has a compression spring, along which strikes the dividing line of the separating pistons, wherein the compression spring on a pressure surface by means of a compressible medium acting compression force equal acting Spring force exerted on the separating piston. Advantageously along the part way to the same acting additional spring force the separating piston are exercised, being inside the second working space increases a pressure of the hydraulic medium. This leads over from a speed the working cylinder and the piston rod dependent pressure difference also to an increase in an internal pressure of the first working space into which the piston rod dips. It is advantageous because of increased pressure required an increased force to push the piston rod into the first working space. In this case, the introduced into the gas spring damper device Increased amount of energy per way traveled. Advantageous can the correspondingly larger amount of energy by means of the additional energy storage already before reaching an end stop, so as soon as the separating piston on the compression spring turns converted, especially in the form of spring energy get saved.

at a further embodiment of the gas spring damper device it is provided that the energy store has a polymer spring. Advantageous Polymer springs have a high internal damping, wherein Advantageously, the converted energy in a reversal of the direction of movement of the Working piston and the piston rod not completely again is released, so that advantageous a Ausschubkraft in the field the final position is smaller than that required in this area Insertion force. The polymer spring may be any deformable Polymer act, in particular polyurethane, for example a closed porous and / or porous polyurethane foam.

at a further embodiment of the gas spring damper device it is envisaged that the polymer spring with the compression spring in series is switched. Advantageously, the energy storage a combination the compression spring and the polymer spring, wherein advantageous the polymer spring and the compression spring have different damping rates can, so that reaching or hitting the separating piston damped on the polymer spring and / or the compression spring can, whereby a smaller change of a slope of a Damper characteristic of the gas spring damper device when adding the energy storage results. Advantageously thereby a comfort behavior of the gas spring damper device be improved in the field of energy storage. Alternative and / or In addition, it is possible, the partial travel of the spring travel be interpreted as being outside a range of motion the piston rod and the working piston of a normal driving operation is located. This can be advantageously ensured that during a normal driving operation, the gas spring damper device offers a high level of ride comfort and only in the case of extreme compression movements, So extremely deep and / or with an extremely high speed, the additional energy storage to intercept the case occurring energies is added. Because in the area of the end position, in particular when striking or penetrating the gas spring damper device an already noticeable loss of comfort occurs, This can be tolerated, being beneficial despite the transition or the connection of the additional energy storage a comparatively greater comfort in the Spring deflection and associated lower maximum forces result.

at a further embodiment of the gas spring damper device is provided that the polymer spring between the compression spring and is arranged the separating piston. Advantageously, a striking Of comparatively hard materials, such as metal, the Separating piston and the compression spring are prevented each other. The interposed polymer spring can advantageously beating dampen.

at a further embodiment of the gas spring damper device is provided that between a bottom of the working cylinder and the compression spring is arranged a spacer sleeve. Advantageous are the compression spring and the spacer sleeve in the gas equalization chamber of the compliance point, by means of the spacer sleeve, the gas volume of the gas compensation chamber can be adjusted or increased, wherein the compression spring can be designed more powerful without thus an excessive reduction of the gas volume of the gas equalization chamber connected is.

The Task is also in a motor vehicle with a solved previously described gas spring damper device. This results in the advantages described above.

Further advantages, features and details will become apparent from the following description, in which - where appropriate, with reference to the drawings - at least one embodiment is described in detail. Described and / or illustrated features form the subject of the invention, or independently of the claims, either alone or in any meaningful combination, and in particular may additionally be the subject of one or more separate applications. The same, similar and / or functionally identical parts are given the same reference numerals Mistake. The only

1 shows a gas spring damper device with a compliance point with an additional energy storage.

1 shows a schematic longitudinal sectional view of a gas spring damper device 1 a partially illustrated motor vehicle 3 , The gas spring damper device 1 can the rest of the motor vehicle 3 by means of an eye 5 and a piston rod 7 be associated with spring damper forces between the gas spring damper device 1 and the rest of the motor vehicle 3 are transferable. The piston rod 7 is a working piston 9 permanently assigned. The working piston 9 is inside a working cylinder 11 slidably mounted, the working cylinder 11 by means of the working piston 9 in a first workroom 13 and a second workspace 15 is divided. In addition, inside the working cylinder 11 a separating piston 17 slidably mounted. The separating piston 17 separates the second workspace 15 from a gas compensation room 19 from. The workrooms 13 and 15 are filled with a substantially non-compressible hydraulic medium, such as a hydraulic oil. The gas compensation room 19 is filled with a compressible medium, in particular a gas, for example air.

The gas compensation room 19 and the separating piston 17 are part of a compliance office 21 , which correspond to a gas pressure of the gas equalization chamber 19 by means of the separating piston 17 in the workrooms 13 and 15 provides a hydraulic pressure.

The piston rod 7 can along a spring travel 23 together with the working piston 9 in the first workroom 13 plunge. In this case, volume, ie the hydraulic medium displaced, according to the traveled spring travel 23 , a cross section of the piston rod 7 and the hydraulic internal pressure of the first working space 13 at a compression movement hydraulic energy in the gas spring damper device 1 is introduced. This hydraulic energy can advantageously by means of the compliance point 21 at least partially converted, in particular stored in the form of compression energy.

The working piston 9 has only indicated valves, which is an overflow of the hydraulic medium from the first working space 13 in the second workspace 15 , and vice versa, allow. In this case, the remaining part of the hydraulic energy is converted into heat energy, this conversion is also referred to as damper energy. Advantageously, this energy of a body movement of the motor vehicle 3 be withdrawn.

The compliance point 21 has one on a floor 27 of the working cylinder 11 abutting spacer sleeve 29 on. At the spacer sleeve 29 beats a compression spring 31 at. At the compression spring 31 beats a polymer spring 33 at. The polymer spring 33 realized a soft stop 25 and is made of a corresponding material, such as polyurethane.

At the polymer spring 33 can the separating piston 17 attacks. This is a filling of the work spaces 13 . 15 designed with the hydraulic medium so that the separating piston only when covering a partial route 35 of the working piston 9 and the piston rod 7 strikes.

Along a comfort part way 37 of the spring travel 23 the separating piston hits 17 not on the polymer spring 33 at. It is advantageous along the comfort part way 37 the compression spring 31 and the polymer spring 33 inactive, with only the gas pressure of the gas compensation chamber 19 by means of the separating piston 17 on the hydraulic medium in the workrooms 13 . 15 is transmitted.

If the piston rod 7 the entire comfort part way 37 has completed, so the beginning of the partial route 35 reached, hits the separating piston 17 on the polymer spring 33 on, wherein the polymer spring 33 and the compression spring 31 together one of a pressure force of the gas compensation chamber 19 placed on a pressure surface of the separating piston 17 acts, the same directional spring force affects.

Advantageously, this force component, so the spring force also in a pressure, so an increased pressure in the workrooms 13 . 15 implemented. Advantageously, this pressure increase results in an increased extension force of the piston rod 7 , which is advantageous with increasing compression, so with increasing spring force of the compression spring 31 and / or the polymer spring 33 increased, taking at the end of the partial route 35 So at a limit stop results in a maximum force. Advantageously, therefore, the force acting on the piston rod Ausschubkraft can be progressively increased up to the end position, which advantageously strong shocks or the resulting amount of energy in the compression spring 31 and the polymer spring 33 converted, in particular, can be stored. A corresponding amount of energy and thus maximum force at the end stop can be advantageously reduced.

The compression spring 31 and the polymer spring 33 So represent an additional energy storage, by means of along the part way 35 by means of the piston rod 7 in the gas spring damper device 1 introduced hydraulic energy additionally converted, in particular stored, can be.

At high damper speeds during compression movements it is advantageous for the end of the compression end, ie along the partial path 35 particularly heavily damped.

Compared to gas spring damper devices having a stop buffer at a compression end, there is no reduction in damper forces since a compression speed is not reduced by means of respective buffers. Rather, advantageously finds an increase in the internal pressure in the work spaces 13 and 15 instead of. To obtain this highly progressive speed-dependent piston rod force is advantageous under the separating piston 17 the additional energy storage in the form of the polymer spring 33 and the compression spring 31 appropriate. This additional energy storage, so the compression spring 31 and the polymer spring 33 touch the separating piston 17 already far ahead of the final position, ie along the partial route 35 , This advantageously increases the oil pressure or the hydraulic pressure initially between the separating piston 17 and the working piston 9 within the second workspace 15 disproportionately, which is advantageous an increased pressure difference on the working piston 9 adjusts, which advantageously leads to an increased damping force. In addition, a force component is still built because of the plunging piston rod 7 Oil volume is displaced, which is the separating piston 17 shifts and the compression spring 31 as well as the polymer spring 33 biases.

The work done, which is absorbed in known gas spring damper devices only on a very small part of the way, in the range of a few millimeters, the compression travel by Einfederpuffer and / or Einfederendanschläge is damper device in the gas spring 1 advantageous along the part way 35 distributes and thus reduces the forces occurring at the compression end. Advantageously, the partial route 35 outside a comfort-relevant suspension area of the comfort partial path 37 lie.

Advantageously, a minimization of the maximum forces in the damper path, ie along the compression travel and a damper periphery of the gas spring damper device 1 in particular brackets, buffers, head bearings, spring domes, spring links and / or similar, which occur when the damper drives by jerk-like excitation at high speed in a compression travel limit.

Advantageous can disproportionate degradation of energy at the end of the spring be achieved. Advantageously, this can be a shock factor be significantly reduced at the end of the spring. Advantageously, accordingly necessary buffers are performed weaker and, for example, do not require a metal girdle.

Advantageously, one of the gas spring damper device 1 associated damper dome of the motor vehicle 3 be carried out more easily. It is advantageously possible, a spring link of the motor vehicle 3 to interpret weaker. Advantageously, so-called brackets of the motor vehicle 3 and other attachments of the motor vehicle 3 be designed weaker.

1

Gas spring damper device

3

motor vehicle

5

eye

7

piston rod

9

working piston

11

working cylinder

13

first working space

15

second working space

17

separating piston

19

Gas compensation space

21

compliance point

23

travel

25

soft stop

27

ground

29

Stand Off

31

compression spring

33

polymer spring

35

partial route

37

Komfortteilweg

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 3425988 A1 [0003]

Claims (7)

Gas spring damper device ( 1 ), in particular for a motor vehicle ( 3 ), with: - a working cylinder ( 11 ), - one within the working cylinder ( 11 ) along a spring travel ( 23 ) displaceably mounted and the working cylinder ( 11 ) in a filled with a hydraulic medium or fillable first working space ( 13 ) and a filled with the hydraulic medium or fillable second working space ( 15 ) dividing working piston ( 9 ), - one of the working piston ( 9 ) and into the first workspace ( 13 ) submerged piston rod ( 7 ) by means of along the spring travel ( 23 ) in a plunge motion hydraulic energy into the gas spring damper device ( 1 ), - at least one of the workspaces ( 13 . 15 ) hydraulically assigned and a compliant with a compressible medium or filled gas compensation space compliance point ( 21 ) can be converted by means of the at least one subset of the hydraulic energy which can be introduced during the immersion movement, in particular by means of the compressible medium, can be stored, characterized in that the compliance point ( 21 ) has an additional energy store by means of the additional subset of the immersion movement along a partial path ( 35 ) of the travel ( 23 ) storable hydraulic energy can be stored. Gas spring damper device according to the preceding claim, characterized in that the energy store is a compression spring ( 31 ) along which the partial path ( 35 ) the separating piston ( 17 ), whereby the compression spring ( 31 ) exerts a spring force acting in the same way on the separating piston on a compression surface acting on a pressure surface by means of the compressible medium. Gas spring damper device according to one of the preceding claims, characterized in that the energy store is a polymer spring ( 33 ) having. Gas spring damper device according to the preceding claim, characterized in that the polymer spring ( 33 ) with the compression spring ( 31 ) is connected in series. Gas spring damper device according to one of the preceding claims, characterized in that the polymer spring ( 33 ) between the compression spring ( 31 ) and the separating piston ( 17 ) is arranged. Gas spring damper device according to one of the preceding claims, characterized in that between a floor ( 27 ) of the working cylinder ( 11 ) and the compression spring ( 31 ) a spacer sleeve ( 29 ) is arranged. Motor vehicle ( 3 ) with a gas spring damper device ( 1 ) according to any one of the preceding claims.