AT523688A1 - Hydraulic shock absorber, as well as procedures for assembling a shock absorber - Google Patents

Abstract

The invention relates to a hydraulic shock absorber (1) comprising a cylindrical housing (2) with an outer casing surface (4) and an inner casing surface (5), a bottom closure (7) which is attached to a first end face (6) of the housing ( 2) is arranged, a piston (11) and a piston rod (3) coupled to the piston (11), a closure cover (9) which is arranged on the second end face (8) opposite to the first end face (6) and a through hole (10) for the piston rod (3) which is movable in the axial direction of the housing (2). The inner casing surface (5) of the bottom closure (7) and the closure cover (9) delimit a housing interior (12), the piston (11) dividing the housing interior (12) into a first interior chamber (13) and a second interior chamber ( 14) divides and wherein a flow connection (15) is formed between the first interior chamber (13) and the second interior chamber (14). The invention also relates to a method for assembling a hydraulic shock absorber (1).

Description

the assembly of a hydraulic shock absorber.

From DE 202014004193 U1 and DE 20302121 U1 hydraulic shock absorbers are known which have a housing in which a piston by means of

a piston rod is movably guided.

The object of the present invention was to overcome the disadvantages of the prior art and to create an improved hydraulic shock absorber and a method for the assembly of a hydraulic shock absorber for

supply which allows a high degree of automation.

This object is achieved by a device and a method according to the claims

chen solved.

The invention relates to a hydraulic shock absorber comprising a cylindrical housing with an outer casing surface and an inner casing surface, a bottom closure which is arranged on a first end face of the housing, a piston and a piston rod coupled to the piston, a closure cover which is attached to the is arranged opposite to the first end face second end face and has a through hole for the movable piston rod in the axial direction of the housing. The inner casing surface of the bottom closure and the closure cover delimit a housing interior, the piston dividing the housing interior into a first interior chamber and a second interior chamber and with between

the first interior chamber and the second interior chamber a flow

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wise a hydraulic fluid.

The present shock absorber is particularly suitable for industrial use, with maximum energy absorption and gentle damping being achieved by the structure according to the invention. Furthermore, thanks to its modular structure, the StoRdamper is scalable in terms of size and is therefore suitable for a wide variety of areas of application where braking and damping of

moving masses is required.

The hydrostatic piston guide also ensures that when the shock absorber is actuated, there is only little wear or that wear is largely prevented. The shock absorber according to the invention thus has

a comparatively long service life.

Furthermore, it can be expedient if a helical groove is formed in a helical region of the inner casing surface, via which the flow connection between the first interior chamber and the second inner

Raumkammer is produced.

Using the helical groove, a high power consumption can be achieved through maximum utilization in every piston position. Furthermore, a defined damping characteristic can be achieved by providing the helical groove within the inner casing surface, the helical groove serving as a throttle element. At the same time, a helical groove can be easily produced in the inner casing surface of the housing.

place.

Because a fluid medium can flow between the piston and the piston guide surface, which is formed by the helical groove, during the entire stroke of the shock absorber, the relatively moving parts can be

film can be separated, which can further minimize wear.

In addition, the continuous flow of the fluid medium through the

Helical groove achieved only low stress on the fluid medium.

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a helical groove with a constant groove pitch can be produced easily and inexpensively.

In addition, it can be provided that a groove base of the helical groove has a constant radius over the entire length of the helical groove, whereby an even flow of the fluid medium can be achieved regardless of the piston position along the helical groove. Furthermore, a helical groove with a constant radius can be produced simply and inexpensively. In particular, a thread chisel can be used here, which is used to change the cross section over the length of the helical groove during manufacture

adjusting movement dips deeper and deeper into the inner surface of the housing.

Alternatively, it can be provided that the helical groove has different contour shapes over its length. This can be achieved, for example, by changing the turning tools for different longitudinal areas of the helical groove. This measure can also change the

Cross-section can be achieved over the length of the helical groove.

An embodiment is also advantageous, according to which the helical groove can have a groove depth minimum and a groove depth maximum, the groove depth increasing continuously from the groove depth minimum to the groove depth maximum, whereby a progressive damping effect of the hydraulic shock absorber can be achieved . Furthermore, due to the continuous tapering of the spiral groove, a low-vibration and precise braking of a

wegten mass can be achieved.

According to a further development, it is possible that the groove depth maximum is closer to the

second face is arranged as the groove depth minimum.

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Attenuation can be achieved.

It can also be useful if the axial extent of the helical region of the helical groove is between 10% and 50%, in particular between 20% and 40%, preferably between 25% and 35% of a housing length, with a distance of the groove depth minimum to the first end face between 10% and 50%, in particular between 20% and 40%, preferably between 25% and 35% of the total

house length is.

The housing length is measured between the first and second face of the

Housing.

A piston guide surface can be formed along the axial extension of the helical region of the helical groove, along which a type of continuous lubricating film for the piston can form. This means that a low-wear

and retraction of the piston can be achieved in the course of a damping movement.

In addition, it can be provided that the piston has a receiving bore for the piston rod, an outer circumferential surface of the piston rod in the area of the receiving bore and / or the inner circumferential surface of the receiving bore having at least one flow channel, the flow channel opening into a fluid passage, wherein in the area of the fluid passage a check valve is arranged. The check valve comprises a valve housing with a valve inlet and a valve outlet, a valve spring and a valve spring

Valve spring adjustable ball.

In a basic position, the check valve is open and the first interior chamber is filled with the fluid medium. When an external force is applied, the piston rod pushes in with the piston and the check valve closes

and the fluid medium flows through the spiral groove into the second interior chamber,

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Piston acts, which acts against the axial movement.

When the shock absorber is reset or extended, the piston rod with the piston is pushed back into the basic position by means of the ejection spring, the non-return valve opening for a rapid return flow of the fluid medium from the second interior chamber into the first interior chamber

fluid medium can flow through the fluid passage via the flow channel.

Furthermore, it can be provided that the ejection spring and the helical groove have an incline in opposite directions. In particular, it can be provided, for example, that the ejection spring has a right-hand slope and the helical groove has a left-hand slope. Alternatively, it can be provided that the ejection spring

a left slope and the helical groove has a right slope.

In an alternative embodiment, the check valve and piston can also

be made in one piece.

Furthermore, it can be provided that a volume compensation is arranged in the housing interior in order to compensate for the volume of the retracting or compressing piston or the displaced fluid medium in the course of damping.

retire.

According to a particular embodiment, it is possible that the volume compensation has a receiving sleeve with a guide bore and a guide surface and that at least one first volume compensation seal and at least one axially displaceable second volume compensation seal with an inner sealing lip and an outer sealing lip are formed, the inner sealing lip of the second volume compensation seal interacts with the guide surface of the receiving sleeve and wherein the outer sealing lip of the second volume compensation seal interacts with the housing inner jacket surface and wherein between the first volume compensation seal and the second volume compensation seal a volume compensation

chamber is formed.

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together.

The diameter of the guide hole is slightly larger than the outer diameter of the piston rod in order to guide the piston rod safely.

ren.

The inner sealing lip and the outer sealing lip can be used to ensure that the fluid medium does not flow into the volume compensation chamber. The second volume compensation seal is only shifted when the piston is retracted or compressed with the piston rod in order to

To compensate lumen of the piston or the displaced fluid medium.

According to an advantageous development it can be provided that between the volume compensation chamber and the second interior chamber a

Fluid connection is formed.

While the second volume compensation seal is displaced in the axial direction in order to compensate for the volume of the retracting piston or the displaced fluid medium, the volume of the volume compensation chamber is reduced. This allows sufficient volume in the second interior chamber for

the fluid medium displaced in the course of damping can be created.

In particular, it can be advantageous if a guide and sealing package for the piston rod is arranged in the interior of the housing on the closure cover, which has at least one wiper, at least one first piston rod guide, at least one second piston rod guide, at least one

Main seal and volume compensation includes.

This can ensure that the piston rod is guided securely, that the fluid receiving space is reliably sealed off from the outside and that no foreign particles penetrate into the interior of the housing from the outside. Advantageously, the

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that no dirt particles adhere magnetically to the piston rod.

The wiper can for example be formed from a textile element such as a felt to prevent dirt particles from penetrating into the interior of the housing

off the piston rod.

The guide and sealing package according to the invention can also ensure that the piston rod is guided in a straight line, whereby a

wear of a shock absorber can still be prevented.

Furthermore, it can be provided that the second piston rod guide has at least one passage opening for a fluid medium which flows through the passage opening from the first interior chamber into the second interior chamber

and vice versa can flow.

In addition, it can be provided that the piston rod is non-magnetic, which can prevent metallic dirt particles from adhering to the piston rod and when the piston rod is retracted into the interior of the housing

be introduced.

The invention also relates to a method for assembling a hydraulic shock absorber, comprising the method steps

- Provision of a cylindrical housing with an outer casing surface and an inner casing surface;

- Insertion of a piston with a piston rod;

- Closing the housing with a closure cover on a second end face of the housing;

- Filling a housing interior with a fluid medium;

- Closing the housing with a bottom closure on a first front

side of the housing.

According to the invention, a method for the reliable, highly automated assembly of a hydraulic shock absorber is provided, the assembly method being suitable for shock absorbers of the most varied of sizes.

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the housing can be inserted.

According to a further development, it is possible for a helical groove to be made on the inner casing surface of the housing by means of a turning chisel, the turning chisel at the same time being radial during the movement in the axial direction of the housing

is delivered to the inner surface of the housing.

With a turning tool, a helical groove can be easily and reliably made in the inner casing surface of the housing, the method being similar to

in thread turning, can be carried out in a highly automated manner.

Furthermore, it can be useful if the turning tool is continuously advanced over the length of the helical groove, whereby a continuously decreasing or increasing

Mende groove depth can be produced over the helix area. Here it is also conceivable that the groove depth in the middle of the helix area reaches a groove depth maximum

enough.

In addition, it can be provided that during the filling of the housing interior with the fluid medium, a housing interior pressure between 0 mbar and 950 mbar, in particular between 10-12 mbar and 300 mbar, is preferred

between 10 mbar and 100 mbar is applied.

By applying a vacuum in the interior of the housing, bubble-free filling with the fluid medium can be ensured, whereby an increase in the quality of a shock absorber or an improvement in the damping effect of the shock absorber can be achieved. During the evacuation process of the housing interior, the housing can also be rotated in order to ensure complete evacuation or to close the evacuation process

to enhance.

Advantageously, the fluid medium is also evacuated before the interior of the housing is filled in order to ensure or further improve a bubble-free, complete filling of the interior of the housing.

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that is rotated.

With this method step it can also be achieved that all spaces in the housing interior are filled with the fluid medium in order to

to improve complete, bubble-free filling of a shock absorber.

According to a particular embodiment, it is possible that while the interior of the housing is being filled with the fluid medium, the housing is made to vibrate, which can further improve the fact that the fluid medium reaches all the spaces in the interior of the housing in order to completely or bubble-free a shock absorber fill up. The vibration can be a shaking movement or an application of ultrasound.

deln.

According to an advantageous development, it can be provided that while the interior of the housing is being filled with the fluid medium, the filling level is measured in order to stop the filling process when a maximum filling quantity is reached. This can prevent or prevent the

fluid medium emerges from the housing interior when it is closed.

In particular, it can be advantageous if the fluid medium is tempered before the filling process and / or during the filling process in order to increase the viscosity of the fluid medium. This can also ensure that all spaces in the housing interior with the during the filling process

fluid medium are applied.

It can also be provided that the housing is tempered in order to reduce the viscosity

ity of the fluid medium, during filling, to continue to improve.

In addition, it can be provided that the housing is closed with the bottom closure when a maximum fill level is reached, whereby the device

the interior of the house can be designed to be pressure-tight and liquid-tight.

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An embodiment is also advantageous, according to which it can be provided that, during the closing of the housing with the bottom closure and / or during the filling of the housing interior with the fluid medium, a second volume compensation seal of a volume compensation with an inner sealing lip along a guide surface of a receiving sleeve of the volume

menausgleichs is shifted in the axial direction.

The volume compensation develops a kind of membrane effect and acts as a compensation for manufacturing or filling tolerances, which further ensures that the fluid receiving space or housing interior is complete and blown.

be filled with the fluid medium without a trace.

For a better understanding of the invention, it will be explained on the basis of the following

Figures explained in more detail.

They each show in a greatly simplified, schematic representation:

1 shows an embodiment of a hydraulic shock absorber;

2 shows a sectional view of an exemplary embodiment of a hydraulic shock absorber;

Fig. 3 is a sectional view of a further embodiment of a hydraulic

shock absorber;

4 shows a detailed view of an embodiment of a helical groove; 5 shows a detailed view of an embodiment of a volume compensation; 6 a and b each show a sectional view of different embodiments

games of piston rod guides;

7 shows a sectional view of an exemplary embodiment of a piston rod with

a flow channel;

8 shows a schematic representation of an embodiment for production

a helical groove;

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9 shows a schematic representation of an embodiment of the delivery

a lathe tool for producing a helical groove; 10 shows a further exemplary embodiment of a shock absorber.

By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference symbols or the same component designations, it being possible for the disclosures contained in the entire description to be transferred accordingly to the same parts with the same reference symbols or the same component designations. The position details chosen in the description, e.g. above, below, to the side, etc., refer to the figure immediately described and shown and are these position-

in the event of a change in position, information must be transferred to the new position accordingly.

1 shows an exemplary embodiment of a hydraulic shock absorber 1 with a cylindrical housing 2 in which an amagnetic piston rod 3

is axially displaceable.

From the sectional view of an exemplary embodiment of the hydraulic shock absorber 1 shown in FIG. 2, it can be seen that the cylindrical housing 2 has an outer casing surface 4 and an inner casing surface 5. On a first end face 6 of the housing 2, the housing 2 is closed in a pressure-tight manner with a bottom closure 7. On a second end face 8 opposite to the first end face 6, the housing 2 is further closed with a closure cover 9 which has a through hole 10 for the piston rod 3 which is movable in the axial direction of the housing 2. The piston

rod 3 is coupled to a piston 11.

The housing inner jacket surface 5, the bottom closure 7 and the closure cover 9 delimit a housing interior 12, which the piston 11 divides into a first interior chamber 13 and a second interior chamber 14. A flow connection 15 is formed between the first interior chamber 13 and the second interior chamber 14, whereby the first interior chamber 13

and the second interior chamber 14 form a fluid receiving space 16.

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When the hydraulic shock absorber 1 is ready for use, the fluid receiving space 16 is filled with a fluid medium 17, in particular with a hydraulic fluid. When extending and retracting the hydraulic shock absorber

1, the piston 11 slides in the axial direction of the housing 2.

When extending, the fluid medium 17 flows via the flow connection 15 from the first interior chamber 13 into the second interior chamber 14, with friction being generated. The kinetic energy of the fluid medium 17 is converted into heat, the movement of the piston 11 is damped, with means

the hydraulic shock absorber 1 a damping effect is achieved.

In the embodiment of the hydraulic shock absorber 1 shown in FIG. 2, a helical groove 19 is formed in a helical region 18 of the inner casing surface 5 in order to provide the flow connection 15 between the first interior chamber

13 and second interior chamber 14 to form.

In the exemplary embodiment, the helical groove 19 has a constant groove pitch 20, a groove base 21 of the helical groove 19 also having a constant radius 22 over the entire length of the helical groove 19. The helical groove 19 also has a groove depth minimum 23 and a groove depth maximum 24, the groove depth 25 increasing continuously from the groove depth minimum 23 to the groove depth maximum 24 and the groove depth maximum 24 being closer to the second end face 8.

is arranged as the groove depth minimum 23.

The axial extent of the helical region 18 of the helical groove 19 is between 25% and 35% of a housing length 26, a distance 27 between the groove depth minimum 23 and the first end face 6 likewise being between 25% and 35% of the housing length 26. The housing length 26 is between the first end face

6 and second end face 8 of the housing 2 measured.

A piston guide surface 28 is formed along the helical region 18,

long which the piston 11 during compression and rebound of the hydraulic shock

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damper 1 is guided in the axial direction. The design of the helical groove 19 according to FIG. 2 causes a progressive damping of the hydraulic shock

damper 1.

In FIG. 2 it can be seen that a guide and sealing package 29 for the piston rod 3 is then arranged on the closure cover 9. The guide and sealing package 29 comprises a wiper 30 in order to prevent contamination of the housing interior 12, in particular the fluid medium 17 received in the fluid receiving space 16. In order to seal the wiper 30 and to hold it in position, it is necessary in the circumferential direction, opposite the inner casing surface

surface 5 a sealing ring 31 is provided with a clamping function.

The fact that the piston rod 3 is non-magnetic also prevents metallic dirt particles from adhering to the piston rod 3 and

get further into the housing interior 12.

The guide and sealing package 29 further comprises a first piston rod guide 32, a second piston rod guide 33, at least one main seal 34 and a volume compensation 35. The main seal is sealed by means of additional sealing rings 31 or clamped at the corresponding position in the housing 2. The second piston rod guide 33 has several passage openings 36 for the fluid medium 17, so that the fluid medium 17 additionally in the axial direction when the hydraulic shock absorber 1 is retracted or compressed

Can flow towards volume compensation 35.

When the hydraulic shock absorber is rebounded or extended, the fluid medium 17 flows via the flow connection 15 from the second interior chamber 14 into the first interior chamber 13, whereby the exhaust movement of the piston

bens 11 is supported by an ejection spring 37.

According to a further, not shown embodiment, the

Ejection spring 37 can be arranged between piston 11 and bottom closure 7.

In addition, in order to accelerate the rebound or extension, the fluid flows

Medium 17 via a flow channel 38 in the piston 11 and a check valve

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39 into the first interior chamber 13. According to the embodiment shown in FIG. 2, the piston 11 has a receiving bore 40 for the piston rod 3, the flow channel 38 being formed on an outer circumferential surface 41 of the piston rod 3 in the region of the receiving bore 40. The flow channel 38 opens into a fluid passage 42, wherein in the area of the fluid passage 42 the

Check valve 39 is arranged.

In an embodiment not shown in detail, the flow channel 38 can also be formed on the inner circumferential surface 43 of the receiving bore 40 of the piston 11

be.

The check valve 39 comprises a valve housing 44 with a valve inlet 45 and a valve outlet 46, a valve spring 47 and a ball 48 adjustable by means of the valve spring 47 the first end face 6 pressed, the fluid passage 42 exposed

ben and the fluid medium 17 flows into the first interior chamber 13.

According to one embodiment, the ejection spring 37 is inserted into the housing during the assembly of the hydraulic shock absorber 1 shown in FIG. 2. The piston 11 with the piston rod 3 and the check valve 39 arranged on it is then inserted into the housing 2. This is a preassembled assembly comprising piston 11, piston rod 3 and check valve 39.

Following this, the guide and sealing package 29 is introduced into the housing 2. This can again be a preassembled assembly, or a second piston rod guide 33, volume compensation 35, main seal 34, first piston rod guide 32 and wiper 30 are used one after the other

introduced or pressed into the housing.

Then the housing 2 with a cover 9 on the second

The end face 8 of the housing 2 is closed and the housing interior 12 with it

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filled with the fluid medium 17, with a housing interior pressure of between 10 mbar and 100 mbar being applied during the filling of the housing interior 12 with the fluid medium 17. Meanwhile, according to an exemplary embodiment, the piston 11 is moved and / or rotated in the axial direction so that the fluid medium 17 can get into all the spaces and a largely air-free filling of the hydraulic shock absorber 1 is ensured. In addition or as an alternative to this, the housing 2 can, for example, by means of ultrasound or a

Shaking movement are set in vibration.

In order to eliminate manufacturing or filling quantity tolerances during the filling process, in one embodiment a second volume compensation seal 49 of the volume compensation 35 with an internal sealing lip 50 along a guide surface 51 of a receiving sleeve 52 of the volume compensation 35 in the axial direction.

postponed. The volume compensation 35 acts here as a type of membrane.

After completion of the filling process, the housing 2 is sealed with the bottom

7 closed on the first end face 6 of the housing 2.

In the case of the valve spring 47 or the ejection spring 37, in an exemplary embodiment not shown in detail, any means for applying a potential

act len energy.

FIG. 3 shows a further and possibly independent embodiment of a hydraulic shock absorber 1, the same reference numerals or component designations being used for the same parts as in the previous FIGS. 1 and 2. In order to avoid unnecessary repetition, reference is made to the detailed description in the preceding FIGS

2 pointed out or referred to.

In the exemplary embodiment of the hydraulic shock absorber 1 shown in FIG. 3, the check valve 39 and piston 11 are made in one piece, that is to say from one component. Fluid passage 42 and valve inlet 45 or also valve outlet 46 here form a common element formed within the integral component

Channel for a fluid medium 17.

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In the embodiment shown in FIG. 3, a closure ball 53 is provided as the bottom closure 7, the sealing of a housing interior 12

takes place by pressing or pressing in the locking ball 53.

FIG. 4 shows a further and possibly independent embodiment of a hydraulic shock absorber 1, the same reference numerals or component designations being used for the same parts as in the previous FIGS. 1 to 3. In order to avoid unnecessary repetition, reference is made to the detailed description in the preceding FIGS

3 pointed out or referred to.

Fig. 4 shows a detailed view of an embodiment of a helical groove 19 which is in a housing inner jacket surface 5 of a housing 2 of the hydraulic shock

damper 1 is provided.

In the exemplary embodiment, the helical groove 19 has a constant groove pitch 20. The helical groove 19 also has a groove depth minimum 23 and a groove depth maximum 24, the groove depth 25 continuously increasing from the groove depth minimum 23 to the groove depth maximum 24 and the groove depth maximum 24 being arranged closer to the second end face 8 than that Groove depth minimum 23. The axial extent of the helical region 18 of the helical groove 19 is between 25% and 35% of a housing length 26, with a distance 27 of the groove depth minimum 23 from the first end face 6 likewise between 25% and 35% of the housing length 26

amounts to.

FIG. 5 shows an embodiment of a volume compensation 35, the same reference numerals or component designations being used again for the same parts as in the preceding FIGS. 1 to 4. To avoid unnecessary repetitions

to avoid lungs, please refer to the detailed description in the preceding

NEN Fig. 1 to 4 pointed out or referred to.

Fig. 5 shows a detailed view of an embodiment of the volume output

same as 35, which is in the housing interior 12 of a hydraulic shock absorber

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1 is arranged. The volume compensation 35 has a receiving sleeve 52 with a guide bore 54 and a guide surface 51, a first volume compensation seal 55 and at least one axially displaceable second volume compensation seal 49 with an inner sealing lip 50 and an outer sealing lip 56 being formed. The second volume compensation seal 49 is adjusted in the axial direction by means of a prestressing spring 57.

arranged to be slidable.

Alternatively, in an embodiment not shown in detail, the second

Volume compensation seal 49 can also be actuated by means of gas pressure.

The diameter of the guide bore 54 of the volume compensation 35 according to FIG. 5 is here slightly larger than the outer diameter of the piston rod 3, whereby the piston rod 3 within the guide bore 54 of the volume

compensation 35 is performed.

The inner sealing lip 50 of the second volume compensation seal 49 interacts with the guide surface 51 of the receiving sleeve 52 and the outer sealing lip 56 of the second volume compensation seal 49 is designed in such a way that it interacts with the inner casing surface 5 of the housing. A volume compensation chamber 58 is formed between the first volume compensation seal 55 and the second volume compensation seal 49, wherein between the volume compensation chamber 58 and a second interior chamber 14 of the

hydraulic shock absorber 1, a fluid connection 59 is formed.

During retraction or compression, a fluid medium 17 flows via a flow connection 15 from a first interior chamber 13 into the second interior chamber 14 and the second volume compensation seal 49 is displaced in the axial direction towards a second end face 8 of the hydraulic shock absorber 1 in order to provide sufficient volume for the in to create the second interior chamber 14 displaced fluid medium 17. The volume compensation chamber 58 is reduced in size, with the sealing by means of an internal sealing lip

50 and the outer sealing lip 56 of the second volume compensation seal 49

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it is ensured that the fluid medium 17 does not enter the volume compensation

chamber 58 penetrates.

6a and 6b show different embodiments of a second piston rod guide 33, the same reference numerals or component designations being used for the same parts as in the preceding FIGS. 1 to 5. To avoid unnecessary repetitions, the detailed

lated description in the preceding FIGS. 1 to 5 referred to or reference

taken.

6a and 6b each show a sectional view of different embodiments of the second piston rod guide 33. The second piston rod guide 33 in each case has at least one passage opening 36 for a fluid medium 17, wherein inside the second piston rod guide 33

a piston rod 3 is received displaceably in the axial direction.

6a shows an essentially circular second piston rod guide 33, with a passage opening 36 on each of two opposite sides.

is formed.

6b shows an essentially circular second piston rod guide 33, four passage openings 36 arranged in the circumferential direction being provided

which have a polygonal shape.

7 shows a sectional view of an embodiment of a piston rod 3, the same reference numerals or component designations being used for the same parts as in the preceding FIGS. 1 to 6. To avoid unnecessary repetition, please refer to the detailed description in the

previous FIGS. 1 to 6 referred to or referred to.

The piston rod 3 shown in FIG. 7 has several flow channels 38. A piston 11 has a receiving bore 40 for receiving the piston rod 3, the flow channels 38 on an outer jacket surface 41 of the piston

rod 3 are formed in the region of the receiving bore 40. To this end, the col-

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The rod 3 has a substantially triangular cross-section in the area of the receiving bore 40, around the flow channels 38 on the outer jacket surface 41

to train.

FIG. 8 shows an embodiment of the manufacture of a helical groove 19, the same reference numerals or component designations being used again for the same parts as in the preceding FIGS. 1 to 7. To avoid unnecessary repetition, please refer to the detailed description in the

previous FIGS. 1 to 7 referred to or referred to.

8 shows a schematic representation of the production of a helical groove 19 with a turning tool 60. The helical groove 19 is made on an inner casing surface 5 of a housing 2 of a hydraulic shock absorber 1 by moving the turning tool 60 in the axial direction of the housing 2 during the movement

is delivered at the same time radially to the inner casing surface 5.

FIG. 9 shows an embodiment of the infeed of a lathe tool 60 for producing a helical groove 19, the same reference numerals or component designations being used again for the same parts as in the preceding FIGS. 1 to 8. In order to avoid unnecessary repetitions, reference is made to the detailed description in the preceding FIGS.

Referenced.

According to FIG. 9, the lathe tool 60 is in this case over the length of the helical groove 19 in

y-direction delivered continuously.

Alternatively, in an embodiment not shown in detail, the rotary

chisels 60 are delivered over a portion of the length of the helical groove 19.

The exemplary embodiments show possible design variants, whereby it should be noted at this point that the invention is not restricted to the specifically illustrated design variants of the same, but rather diverse combinations of the individual design variants with one another are also possible and

this possibility of variation on the basis of the teaching on technical action

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present invention in the ability to operate in this technical field

Specialist lies.

In Fig. 10, a further embodiment of the shock absorber 1 is shown, where-

again, the same reference numerals or component designations are used for the same parts as in the preceding FIGS. 1 to 9. To avoid unnecessary repetition, please refer to the detailed description in the preceding

1 to 9 referred to or referred to.

As can be seen from FIG. 10, it can be provided that the check valve 39 is designed in the form of a poppet valve 39 which has a holding area 61 by means of which it is received in the valve housing 44. The poppet valve 39 can be designed to be rotationally symmetrical. In particular, it can be provided that a groove for receiving the holding area 61 of the tele-

lerventils 39 is formed.

Furthermore, it can be provided that the poppet valve 39 has a sealing wing 62, which serves to seal off the fluid passage 42. Furthermore, throughflow openings 63 can be formed in the poppet valve 39, which serve for the passage of the fluid medium 17. The throughflow openings 63 can be via the

Be distributed circumference.

When the fluid medium 17 - from left to right in FIG. 10 - is pressed through the fluid passage 42, the sealing wing 62 is opened by the fluid pressure and the fluid medium 17 can flow through it. When the fluid medium 17 - from right to left in FIG. 10 - is pressed through the flow openings 63 in the direction of the fluid passage 42, the sealing wing 62 is closed by the fluid pressure and the fluid medium 17 can be prevented from flowing through.

the.

As can also be seen from FIG. 10, it can be provided that instead of using a floor lock 7 designed as an individual part, the floor cover

circuit 7 is an integral part of the housing 2.

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As can also be seen from FIG. 10, provision can be made for a step 64 to be formed on the inner casing surface 4. As a result of the gradation 64, a front diameter 65 and a rear diameter 66 can be formed on the inner casing surface 4. The front diameter 65 can be small

smaller than the posterior diameter 66.

It can thus be provided that the second volume compensation seal 49 is arranged in the area of the front diameter 65. The aforementioned gradation 64 makes it possible to achieve that the second volume compensation seal 49 can easily be pushed into the housing 2 in the area of the rear diameter 66 and the second volume compensation seal 49 does not yet have a sealing effect here. A sealing effect of the second volume compensation seal 49 is only achieved in the area of the front diameter 65, which means that the second volume compensation seal 49 can be pushed into the housing 2 as freely as possible. By this measure it can be achieved that the gas volume in the volume compensation 35 can be kept as small as possible and thus the volume compensation 35 can be filled with the fluid medium 17 as well as possible. In addition, this design has the advantage that the area of the rear diameter 66 only needs to have a lower surface accuracy than the area of the front diameter 65 and 65

thus the shock absorber 1 is inexpensive to manufacture.

The scope of protection is determined by the claims. However, the description and the drawings are to be used to interpret the claims. Individual features or combinations of features from the different exemplary embodiments shown and described can represent independent inventive solutions. The independent inventive solutions

The basic task can be found in the description.

All information on value ranges in the objective description are to be understood in such a way that they include any and all sub-areas, e.g. the information 1 to 10 is to be understood as starting with all sub-areas

are included by the lower limit 1 and the upper limit 10, i.e. all

Some sub-areas begin and end with a lower limit of 1 or greater

N2019 / 02400-AT-00

with an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

For the sake of clarity, it should finally be pointed out that, for a better understanding of the structure, some elements are not to scale and / or enlarged

and / or shown reduced.

N2019 / 02400-AT-00

23

List of reference symbols

Shock absorbers

casing

Piston rod Housing outer jacket surface Housing inner jacket surface first face bottom closure

second end face closing cover through bore piston housing interior

first interior chamber second interior chamber flow connection fluid receiving space fluid medium helical region helical groove

Groove pitch

Groove base

Radius, minimum slot depth, maximum slot depth

Housing length

Distance between the piston guide surface and the wiper guide and sealing package

31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

50 51 52 53 54 55

56 57 58

Sealing ring

first piston rod guide second piston rod guide main seal volume compensation passage opening ejection spring flow channel check valve receiving bore outer jacket surface fluid passage inner jacket surface valve housing

Valve inlet

Valve outlet

Valve spring

Bullet

second volume compensation seal

internal sealing lip guide surface receiving sleeve locking ball guide bore

first volume compensation seal

external sealing lip preload spring

Volume compensation chamber

N2019 / 02400-A T-00

Fluid connection lathe chisel holding area sealed flights! L flow opening gradation

front diameter

rear diameter

24

N2019 / 02400-A T-00

Claims (25)

Claims 1. Comprising hydraulic shock absorber (1) a cylindrical housing (2) with an outer casing surface (4) and an inner casing surface (5); a bottom closure (7) which is arranged on a first end face (6) of the housing (2); a piston (11) and a piston rod (3) coupled to the piston (11); a closure cover (9) which is arranged on the second end face (8) opposite to the first end face (6) and has a through hole (10) for the piston rod (3) which is movable in the axial direction of the housing (2); wherein the inner casing surface (5) of the bottom closure (7) and the closure cover (9) delimit a housing interior (12); wherein the piston (11) divides the housing interior (12) into a first interior chamber (13) and a second interior chamber (14); and wherein between the first interior chamber (13) and the second interior chamber (14) a flow connection (15) is formed. 2. Hydraulic shock absorber (1) according to claim 1, characterized in that a helical groove (19) is formed in a helical region (18) of the inner casing surface (5). 3. Hydraulic shock absorber (1) according to claim 2, characterized in that net that the helical groove (19) has a constant groove pitch (20). 4. Hydraulic shock absorber (1) according to one of claims 2 or 3, characterized in that a groove base (21) of the helical groove (19) over the ge the entire length of the helical groove (19) has a constant radius (22). 5. Hydraulic shock absorber (1) according to one of claims 2 to 4, characterized in that the helical groove (19) has a groove depth minimum (23) and N2019 / 02400-AT-00 has a groove depth maximum (24), the groove depth (25) from the groove depth mini- mum (23) increases continuously to the groove depth maximum (24). 6. Hydraulic shock absorber (1) according to claim 5, characterized in that the maximum groove depth (24) is arranged closer to the second end face (8) is than the groove depth minimum (23). 7. Hydraulic shock absorber (1) according to one of claims 2 to 6, characterized in that the axial extent of the helical region (18) of the helical groove (19) is between 10% and 50%, in particular between 20% and 40%, preferably between 25% and 35% of a housing length (26), with a distance (27) between the groove depth minimum (23) and the first end face (6) being between 10% and 50%, in particular between 20% and 40%, preferably between 25% and 35 % of the housing length (26). 8. Hydraulic shock absorber (1) according to one of the preceding claims, characterized in that the piston (11) has a receiving bore (40) for the piston rod (3), an outer jacket surface (41) of the piston rod (3) in the region of the receiving bore (40) and / or the inner jacket surface (43) of the receiving bore (40) has at least one flow channel (38), the flow channel (38) opening into a fluid passage (42), where- a check valve (39) is arranged in the region of the fluid passage (42). 9. Hydraulic shock absorber (1) according to one of the preceding claims, characterized in that a volume in the housing interior (12) compensation (35) is arranged. 10. Hydraulic shock absorber (1) according to claim 9, characterized in that the volume compensation (35) has a receiving sleeve (52) with a guide bore (54) and a guide surface (51) and that at least a first volume compensation seal (55) and at least one in the axial direction N2019 / 02400-AT-00 displaceable second volume compensation seal (49) are formed with an inner sealing lip (50) and an outer sealing lip (56), the inner sealing lip (50) of the second volume compensation seal (49) cooperating with the guide surface (51) of the receiving sleeve (52) and wherein the outer sealing lip (56) of the second volume compensation seal (49) interacts with the inner casing surface (5) and wherein between the first volume compensation seal (55) and the second volume compensation seal (49) a volume compensation chamber (58) is formed. 11. Hydraulic shock absorber (1) according to claim 10, characterized in that between the volume compensation chamber (58) and the second inlet inner chamber (14) a fluid connection (59) is formed. 12. Hydraulic shock absorber (1) according to one of the preceding claims, characterized in that a guide and sealing package (29) for the piston rod (3), which has at least one scraper, is arranged in the housing interior (12) on the closure cover (9) (30), at least one first piston rod guide (32), at least one second piston rod guide (33), at least one main seal (34) and the volume compensation (35) summarizes. 13. Hydraulic shock absorber (1) according to claim 12, characterized in that the second piston rod guide (33) has at least one passage Has opening (36) for a fluid medium (17). 14. Hydraulic shock absorber (1) according to one of the preceding claims, characterized in that the piston rod (3) is non-magnetic. 15. Procedure for the assembly of a hydraulic shock absorber (1), in particular a hydraulic shock absorber (1) according to one of the preceding encompassing the claims N2019 / 02400-AT-00 - Provision of a cylindrical housing (2) with an outer casing surface (4) and an inner casing surface (5); - Insertion of a piston (11) with a piston rod (3); - Closing the housing (2) with a closure cover (9) on a second end face (8) of the housing (2); - Filling a housing interior (12) with a fluid medium (17); - Closing the housing (2) with a bottom closure (7) on a first end face (6) of the housing (2). 16. The method according to claim 15, characterized in that a helical groove (19) is introduced by means of a lathe chisel (60) on the inner casing surface (5), the lathe chisel (60) simultaneously during the process in the axial direction of the housing (2) radially to the inner casing surface (5) is provided. 17. The method according to claim 16, characterized in that the rotary chisel (60) is continuously advanced over the length of the helical groove (19). 18. The method according to any one of claims 15 to 17, characterized in that during the filling of the housing interior (12) with the fluid medium (17) a housing interior pressure between 0 mbar and 950 mbar, in particular between 10- '? mbar and 300 mbar, preferably between 10 mbar and 100 mbar is applied. 19. The method according to any one of claims 15 to 18, characterized in that during the filling of the housing interior (12) with the fluid Medium (17), the piston (11) is moved in the axial direction and / or is rotated. 20. The method according to any one of claims 15 to 19, characterized in that during the filling of the housing interior (12) with the fluid Medium (17) the housing (2) is made to vibrate. N2019 / 02400-AT-00 21. The method according to any one of claims 15 to 20, characterized in that during the filling of the housing interior (12) with the fluid Medium (17) the level is measured. 22. The method according to any one of claims 15 to 21, characterized in that the fluid medium (17) before the filling process and / or during the filling process is tempered. 23. The method according to any one of claims 15 to 22, characterized in net that the housing (2) is tempered. 24. The method according to any one of claims 15 to 23, characterized in that the housing (2) when a maximum level is reached with the bottom the closure (7) is closed. 25. The method according to any one of claims 15 to 24, characterized in that during the closing of the housing (2) with the bottom closure (7) and / or during the filling of the housing interior (12) with the fluid medium (17) a second volume compensation seal (49) of a volume compensation (35) with an internal sealing lip (50) along a guide surface (51) of a receiving sleeve (52) of the volume compensation (35) in the axial direction is pushed. N2019 / 02400-AT-00