DE202007009299U1 - Gas spring arrangement for motor vehicle, has two cylinders filled with respective pressure mediums, and manually operated locking device provided for mechanically locking piston rod at its extended position - Google Patents

Abstract

The arrangement has a cylinder (1) filled with a pressure medium, and a piston (3) dividing an inner space into two working chambers (4, 5) and arranged in the cylinder. Another cylinder (2) filled with another pressure medium is axially connected with the former cylinder. Another piston (8) has a piston rod (6) that is connected with a fixed component or flap at its downwardly projecting end, where an extension force acting on the latter piston is equal or smaller than weight force of the flap. A manually operated locking device (43) mechanically locks the rod at its extended position.

Description

The The invention relates to a gas spring arrangement for lifting a pivotable Flap from a lowered closed position to a raised open position, in particular a motor vehicle, with a with a pressure medium filled first cylinder, in which a the interior into a first working chamber and a second working chamber dividing piston axially displaceable is arranged, which has a piston rod extending axially through the second working chamber extends, sealingly protruding outwards and with their outward projecting end connected to the flap or a stationary component is, as well as with one or more the first working chamber with the second working chamber connecting flow connections, wherein the opening movement the flap in a certain intermediate position between closed position and open position is persistent.

at Flaps of vehicles, especially in tailgates, it is often desired that the flap of the gas spring assembly is not always in its open position is moved but only up to an intermediate position.

Of the the reason for this may be that the motor vehicle is e.g. parked at low parking spaces should be, in which an opening to the opening position would lead to a hitting the flap on the ceiling.

One Another reason may be that the person driving the car used, not big enough is the open one Flap to close to reach.

task The invention is therefore a gas spring assembly of the aforementioned Art to create, with a simple structure, either an opening to to the intermediate position or to the opening position allows.

These Task is inventively characterized solved, that a second cylinder filled with a further pressure medium axially connected to the first cylinder, in which a the interior into a first working space and a second working space dividing second piston is arranged axially displaceable, which is a second Piston rod, which is opposite to the first piston rod itself extends axially through the second working space and sealed according to Outside sticks out and with her outward projecting end connected to the stationary component or the flap is as well as having one or more the first work space with the second working space connecting connections, which by the further pressure medium acting on the second piston Ausschubkraft is equal to or less than the counteracting weight the flap, as well as with a manually operable locking device for mechanically locking the second piston rod in its extended position.

These Training leads that when not locked in the extended position second piston rod this due to the flap weight in the retracted Position remains and does not extend.

At the Swinging up the flap moves only the first piston rod out, leaving the flap only to the intermediate position swivel up.

Should the flap continues to the opening position panning, this must be supported done manually by the pressurization of the second piston.

Without activity the locking device then pivots the flap again back to the intermediate position.

Becomes the locking device actuated, remain the second piston and the second piston rod in the extended Position.

at a closing the flap moves only the first piston rod, but not the second piston rod.

There the first cylinder corresponds approximately to the strokes of both pistons Owns length, can the flap despite extended second piston rod up in the closed position moved and there e.g. be held by a flap lock.

Becomes now the flap opened, she moves to her opening position.

First, when in the open position the mechanical lock is canceled manually again, the drives second piston rod again.

Without the requirement of a special manually operated element can be easily achieved the mechanical locking device by a relative movement be operable between the second piston rod and the second cylinder.

To the locking device may be on the second piston rod axially immovable first locking member having, with a second locking member fixedly disposed in the second cylinder interacts.

Here are the first locking part and the second locking part is preferably arranged inside the second cylinder.

A high reliability is achieved when the first locking part is rotatably mounted on the second piston rod and a cam drum forms which cam with inclined to the piston rod axis Abweisflanken and that the second locking part with the second cylinder is firmly connected and from a cam sleeve with the piston rod axis inclined Abweisflanken and notches as well as from a likewise with Abweisflanken provided cam crown consists.

first and second cylinder can have different diameters.

Preferably but have the first cylinder and the second cylinder same Inside diameter.

To a training requiring little space leads it when the first cylinder and the second cylinder are arranged coaxially with each other.

Of the the first cylinder and the second cylinder may be at their free piston rod ends each opposite ends to be firmly connected.

Especially but it is rational to produce, if a cylinder tube by a Dividing wall dividing the first and second cylinder is divided.

to support the extension movement of the first piston may be the first and the second Cylinder to be enclosed by a helical compression spring with its one end in the region of the free end of the first piston rod and with its other end in the region of the free end of the second piston rod supported is.

The Helical compression spring also forms a certain temperature compensation, there against the spring force of the pressure medium in the first cylinder the Force of the helical compression spring is independent of temperature constant.

In simple way, the helical compression spring on support plates on the first and / or be supported on the second piston rod.

Around a friction between the helical compression spring and the cylinders reduce and noise to avoid by striking the helical compression spring on the cylinders can provide the helical compression spring with a friction-reducing coating be.

In simple way are one of the flow connections and / or Connections on the inner wall of the first and / or second cylinder axially extending grooves formed.

has one or both grooves at its piston rod end one increasingly decreasing cross-section, so takes place at the end of Extension stroke a damping the extension movement.

A more of the flow connections and / or Connections can be arranged in the first and / or second piston check valve be that in an extension movement of the first and / or the second Piston closed and at a retraction movement of the first and / or opened the second piston is.

Preferably is the interior of the first and / or the second cylinder with filled with a pressurized gas.

embodiments The invention are illustrated in the drawings and will be described in more detail below. Show it

1 a first embodiment of a gas spring assembly in longitudinal section

2 a detailed illustration of the locking device of the gas spring assembly according to 1 in longitudinal section

3 a settlement of the locking elements of the locking device after 2

4 A second embodiment of a gas spring assembly in longitudinal section

5 a side view of the cylinder after 1 with extended first and second piston rod

6 a side view of the cylinder after 1 with retracted first and extended second piston rod

7 a side view of the cylinder after 1 in the intermediate position with extended first piston rod and retracted second piston rod

8th a side view of the cylinder after 1 with teilausgefahrener first piston rod and retracted second piston rod

9 a side view of the cylinder after 1 with extended first and second piston rod.

10 a third embodiment of a gas spring assembly in longitudinal section

In the 1 illustrated gas spring assembly has a first cylinder 1 and a second cylinder 2 on, have the same inner diameter and connected at one end coaxial with each other firmly and both are filled with compressed gas.

In the first cylinder is a first piston 3 arranged axially movable, the interior of the first cylinder 1 in a first working chamber 4 and a second working chamber 5 divided.

At the first piston 3 is a first piston rod 6 attached, extending axially through the second working chamber 5 extends and through a first seal and guide package 7 sealed outwards.

In the second cylinder 2 is a second piston 8th arranged axially movable, the interior of the second cylinder 8th in a first workroom 9 and a second workspace 10 divided.

On the second piston 8th is a second piston rod 11 attached, which extends axially through the second working space and through a second sealing and guiding package 12 sealed outwards.

The free end of the first piston rod 3 is threaded, on which a first connector 13 screwed on, over which the first piston rod 6 is hinged to a flap, not shown, at a distance from the pivot axis.

The second end of the second piston rod 11 is threaded in the same way, on which a second connector 14 screwed over the second piston rod 11 is hinged to a body-mounted part of the motor vehicle.

On the first piston rod 6 is before screwing on the first connector 13 a first support plate 15 pushed with its central bore, which then axially on the screwed first connector 13 supported.

In the same way is on the second piston rod 11 before screwing on the second fitting 14 a second support plate 16 slid with its central bore, which then axially on the screwed second connector 14 supported.

The second cylinder 2 is in 1 from a second protective sleeve 17 enclosed, at one end a radially outwardly directed collar 18 having, axially on the second support plate 16 is applied.

The second protection sleeve 17 , the second cylinder 2 and the first cylinder 1 are from a helical compression spring 19 enclosed, with one end over the collar 18 or in 1 directly on the second support plate 16 is supported.

With its other end is the helical compression spring 19 over a second collar 20 a first protective sleeve 21 on the first support plate 15 supported.

The first protective sleeve 21 encloses the helical compression spring 19 and sticks out over the collar 18 opposite end of the second protective sleeve 17 out to the second support plate 16 out.

In 1 are the two cylinders 1 and 2 through a welded joint 22 connected with each other.

In the embodiment of the 4 protrude with the first cylinder 1 and the second cylinder 2 firmly connected threaded pins 23 and 24 coaxial with each other and are for connecting the cylinder 1 and 2 opposite each other in a threaded sleeve 25 screwed. Both cylinders 1 and 2 are from a protective tube 44 enclosed.

Otherwise, the embodiments of the 1 and 4 equal.

The first cylinder 1 has an axially extending on its inner wall groove 26 on, at their two end areas 27 and 28 have an increasingly diminishing cross-section for damping the extension and retraction movement.

In a radially circumferential first annular groove 29 on the circumferential surface of the first piston 3 is a sealing ring 30 arranged axially displaceable and unterströmbar, with its radially outer circumferential surface on the inner wall of the first cylinder 1 is applied.

The piston rod side wall of the groove 26 points to the second working chamber 5 leading passages 31 on while the other sidewall of the groove 26 closed is.

This arrangement acts as a check valve in the extension direction of the piston rod 6 closed and opened in the retraction direction.

This consists in the extension direction a throttled flow connection and in the retraction unthrottled flow connection zwi the first working chamber 4 and the second working chamber 5 ,

In the second piston 8th is the same as in the first piston 3 a check valve of the same function formed whose constituents the same reference numerals as the check valve in the first piston 3 however, have an index provided.

Furthermore, in the second piston 8th axial connections 32 designed with throttle area, at its mouth in the working space 9 through a flap 33 a flapper valve are closed. This is the case when the pressure in the first working space 9 larger than in the second workspace 10 is.

This is in the extension only one throttle cross-section for overflow of the compressed gas from the second working space 10 in the first workroom 9 to disposal.

In the retraction is the much larger flow area of the check valve with the sealing ring 30 to disposal.

For locking the second piston rod 11 in its extended position is in the second cylinder 2 a locking device 43 arranged with the following structure and the following operation.

Near the second piston 8th is on the second piston rod 11 a cam drum 34 arranged, which cams to their outer circumference 35 distributed on the circumference. The cams 35 are opposite the cam drum 34 raised radially outward.

The cam drum 34 is on the second piston rod 11 rotatably arranged, but axially fixed. Following the second seal and guide package 12 is in the second cylinder 2 and guided by this a cam crown 36 and a cam sleeve 37 which by a bead 38 in the second cylinder 2 are tense. Both the cam sleeve 37 as well as the cam crown 36 have cam tracks in the form of cams, which protrude radially inward. A settlement of all curved paths is in 3 played. Then point the cams 35 the cam drum 34 Abweisflanken 39 on. The cam sleeve 37 has deflector edges 40 and rest 41 on and the cam crown 36 also has reject edges 42 on.

The arrangement is made so or the extension force of the second piston 8th so dimensioned that the flap to be operated must be moved by an additional force of the operator. Here, with the flap closed, the second piston rod 11 retracted and the parts of the locking device 43 separated from each other. When extending the second piston rod 11 the cam drum moves 34 together with the second piston rod 11 towards the second sealing and guiding package 12 to. In the course of this movement, the Abweisflanken closer 39 the cam 35 the cam drum 34 the deflector edges 40 the cam sleeve 37 , Since both Abweisflanken are arranged on the same diameter, they are thus mutually in the way. Due to the corresponding inclination of the Abweisflanken 39 and 40 and by the rotatability of the cam drum 34 on the second piston rod 11 slide the Abweisflanken past each other and the cams 35 the cam drum 34 move between the deflector flanks 40 the cam sleeve 37 towards the second sealing and guiding package 12 to.

Through the opening between the individual Abweisflanken 40 in the cam sleeve 37 in the circumferential direction is the Abweisflanken 39 the cam drum 34 given such a direction that upon further outward movement of the second piston rod 11 the deflector edges 39 with the deflector flanks 42 the cam crown 36 come in contact. These deflector edges 42 the cam crown 36 are arranged so that the cam drum 34 make another turn in the same direction as before.

During the subsequent retraction of the second piston rod 11 , ie when lowering the flap, now fit the cams 35 the cam drum 34 no longer through the free openings between the Abweisflanken 40 in the cam sleeve 37 , They are going through the catches 41 in the cam sleeve 37 captured, whereby the positive locking is ensured. In this state, the lock is performed.

To unlock the second piston rod 11 in turn extended, causing the Abweisflanken 39 the cam drum 34 at one of the corresponding Abweisflanken 42 the cam crown 36 undergoes a further rotation, which during the subsequent retraction of the second piston rod 11 the cam drum 34 with the cams 35 and the Abweisflanken 39 at the Abweisflanken 40 the cam sleeve 37 lets slip past and thus the passage of the cam drum 34 through the cam sleeve 37 allows. This unlocks the lock.

The Lock is without additional Turn both hand on and off, only by lifting or lowering the flap.

It is quite possible that at For example, the cam drum 34 firmly on the second piston rod 11 is arranged and for the cam sleeve 37 and cam crown 36 are rotatably mounted. Likewise, the cam tracks necessary for locking can be exchanged, for example, between the rotatable part and the non-rotatable part.

When the flap is opened, the first piston moves 3 until the first guiding and sealing package 7 , wherein the first piston rod 6 from the first cylinder 1 is moved out and the flap is moved to its intermediate position. By applying a hand force on the flap further in the opening direction, the second piston 8th in the second cylinder 2 to the second guide and seal package 12 and thus the second piston rod 11 from the second cylinder 2 emotional. On the one hand, the flap can be moved further into the locking position, as described for the other exemplary embodiments; on the other hand, the flap can be moved into a region between the fully inserted position and the locking position of the second piston rod 11 or of the second piston 8th lies.

Will be the second piston rod in this area 11 or the second piston 8th not moved further closes the closing valve and an overflow of the compressed gas from the second working space 10 in the first workroom 9 is not possible anymore. The flap remains in the currently set position and is held securely.

When the flap is moved back to its closed position, the second piston rod becomes first 11 completely in the second cylinder 2 pushed in and then the first piston rod 6 in the first cylinder 1 , When reopening the flap this pivots again only in its intermediate position.

In 10 is shown a further embodiment, which except for the piston assembly in the second cylinder 2 the in 1 illustrated embodiment corresponds. The piston 8th includes a stationary guide sleeve 45 , the end a circumferential support edge 46 for a closing spring 47 having. The closing spring 47 tenses a slider 48 ago, with his slider sleeve 49 on the guide sleeve 45 centered. The closing spring 47 engages an annular slider surface 50 on, whose axial outlet with a sealing ring 51 interacts. The sealing ring 51 forms an axially movable valve element on a valve ring 52 can take different switching positions.

On the lateral surface of the valve ring 52 a contour is executed that allows three switching positions. From the slider surface 50 From the starting point, the valve ring has 52 via a first valve seat surface in the form of an inclined surface 53 , a second valve seat surface in the form of a clamping surface 54 and a third valve surface in the form of an inclined surface 55 , By means of a stop ring 56 becomes the entire piston construction of the second piston 8th braced. A valvering gasket 57 prevents leakage between the piston rod pinion of the second piston rod 11 and the valve ring 52 ,

If the flap has moved into its intermediate position and is opened further by hand, acts between the sealing ring 51 and a second cylinder 2 a frictional force opposing the piston rod movement. The sealing ring 51 is up to the stop ring 56 postponed. The gas can be from the second working space 10 through one of the inclined surface 55 and the sealing ring 51 formed gap virtually unthrottled in the first working space 9 stream.

When the flap is stopped, either by letting go or by locking in the end position, the sealing ring becomes 51 by the prevailing pressure conditions in the second cylinder back to the clamping surface 54 pressed.

When the flap is closed, the second piston rod becomes first 11 in the second cylinder 2 inserted, the sealing ring is supported 51 at the outlet of the slide surface 50 from. The sealing ring 51 gets from the pressure in the workroom 9 and the frictional force between the second cylinder 2 and the sealing ring 51 against the slider 48 pressed. Is the sum of frictional and compressive force greater than the closing force of the closing spring 47 , so the slider moves 48 together with the sealing ring 51 in the direction of the second connector 14 , The gas can be from the first working space 9 through one of the inclined surface 54 and the sealing ring 51 formed gap in the second working space 10 stream.

If the second piston rod 11 is pushed to a stop, the sealing ring 51 by the prevailing pressure conditions in the second cylinder or by the closing spring 47 again on the clamping surface 54 pushed back.

In certain areas, in the second cylinder 2 not shown, extending in the longitudinal direction grooves, the above-described function of the second piston 8th override, so that in these areas do not detect the flap with the help of the second piston 8th is possible.

1

first cylinder

2

second cylinder

3

first piston

4

first working chamber

5

second working chamber

6

first piston rod

7

first Sealing and guiding package

8th

second piston

9

first working space

10

second working space

11

second piston rod

12

second Sealing and guiding package

13

first connector

14

second connector

15

first support plate

16

second support plate

17

second protective sleeve

18

collar

19

Helical compression spring

20

second collar

21

first protective sleeve

22

welded joint

23

threaded pin

24

threaded pin

25

threaded sleeves

26

groove

27

end

28

end

29

first ring groove

29 '

first ring groove

30

seal

30 '

seal

31

crossings

31 '

crossings

32

links

33

flap

34

cam barrel

35

cam

36

cam crown

37

cam sleeve

38

Beading

39

Abweisflanken

40

Abweisflanken

41

rest

42

Abweisflanken

43

locking device

44

thermowell

45

guide sleeve

46

supporting edge

47

closing spring

48

pusher

49

sliding sleeve

50

gate surface

51

seal

52

valve ring

53

sloping surface

54

clamping surface

55

sloping surface

56

stop ring

57

Valve ring seal

Claims (15)

Gas spring arrangement for lifting a pivotable flap from a lowered closed position to a raised opening position, in particular of a motor vehicle, with a filled with a pressure medium first cylinder in which a the inner space in a first working chamber and a second working chamber dividing piston is arranged axially displaceable, the one Piston rod which extends axially through the second working chamber, sealingly protrudes outwardly and is connected with its outwardly projecting end to the flap or a stationary component, and with one or more the first working chamber with the second working chamber connecting flow connections, wherein the Opening movement of the flap in a certain intermediate position between closed position and open position is haltbar, characterized in that a filled with a further pressure medium second cylinder ( 2 ) axially with the first cylinder ( 1 ), in which a the interior in a first working space ( 9 ) and a second workspace ( 10 ) dividing the second piston ( 8th ) is arranged axially displaceable, which is a second piston rod ( 11 ), which are opposite to the first piston rod ( 6 ) axially through the second working space ( 5 ) and sealed outwardly protrudes and is connected with its outwardly projecting end with the stationary component or the flap and with one or more the first working space ( 9 ) with the second working space ( 10 ), wherein the through the further pressure medium on the second piston ( 8th ) is equal to or smaller than the counteracting weight force of the flap, as well as with a manually operable locking device ( 43 ) for the mechanical locking of the second piston rod ( 11 ) in its extended position. Gas spring arrangement according to claim 1, characterized in that the mechanical locking device by a relative movement between the second piston rod ( 11 ) and the second cylinder ( 2 ) is operable. Gas spring arrangement according to claim 2, characterized in that the locking device ( 43 ) on the second piston rod ( 11 ) axially immovable first locking member points that with one in the second cylinder ( 2 ) cooperating second locking part cooperates. Gas spring arrangement according to claim 2, characterized in that the first locking part on the second piston rod ( 11 ) is rotatably mounted and a cam drum ( 34 ), which cams ( 35 ) with the piston rod axis inclined Abweisflanken ( 39 ) and that the second locking part with the second cylinder ( 2 ) is firmly connected and from a cam sleeve ( 37 ) with the piston rod axis inclined Abweisflanken ( 40 ) and rest ( 41 ) as well as from a likewise with Abweisflanken ( 42 ) provided cam crown ( 36 ) consists. Gas spring arrangement according to one of the preceding claims, characterized in that the first cylinder ( 1 ) and the second cylinder ( 2 ) have the same inner diameter. Gas spring arrangement according to one of the preceding claims, characterized in that the first cylinder ( 1 ) and the second cylinder ( 2 ) are arranged coaxially with each other. Gas spring arrangement according to one of the preceding claims, characterized in that the first cylinder ( 1 ) and the second cylinder ( 2 ) are firmly connected to each other at their free piston rod ends opposite ends. Gas spring arrangement according to one of the preceding claims, characterized in that a cylinder tube through a partition the first and divided second cylinder forming. Gas spring arrangement according to one of the preceding claims, characterized in that the first and the second cylinder ( 1 . 2 ) of a helical compression spring ( 19 ) are enclosed with one end in the region of the free end of the first piston rod ( 6 ) and with its other end in the region of the free end of the second piston rod ( 11 ) is supported. Gas spring arrangement according to claim 9, characterized in that the helical compression spring ( 19 ) via support plates ( 15 . 16 ) on the first and / or on the second piston rod ( 6 . 11 ) are supported. Gas spring arrangement according to one of claims 9 and 10, characterized in that the helical compression spring with a friction reducing coating is provided. Gas spring arrangement according to one of the preceding claims, characterized in that one of the flow connections and / or connections on the inner wall of the first and / or second cylinder axially extending grooves ( 26 ) are. Gas spring arrangement according to one of the preceding claims, characterized in that one or both grooves ( 26 ) have an increasingly decreasing cross section at their piston rod end. Gas spring arrangement according to one of the preceding claims, characterized in that a further one of the flow connections and / or connections in the first and / or second piston ( 1 . 2 ) arranged check valve, which in an extension movement of the first and / or the second piston ( 1 . 2 ) closed and at a retraction movement of the first and / or the second piston ( 1 . 2 ) is open. Gas spring arrangement according to one of the preceding claims, characterized in that the interior of the first and / or the second cylinder ( 1 . 2 ) is filled with a pressurized gas.