CN105874217B - Piston-cylinder equipment - Google Patents

Abstract

The invention relates to a piston-cylinder arrangement having a pressure tube (1) in which a piston is arranged axially displaceable and which is guided outwards in a sealing manner at a first end of the pressure tube (1). At the second end of the pressure tube (1) opposite to the first end of the pressure tube (1), there is a sleeve (7) telescopically displaceable towards the pressure tube (1), which sleeve utilizes its length A part surrounds the pressure tube (1) and its end facing away from the pressure tube (1) is closed and carries a connection piece (8), wherein a screw with an external thread that is fixedly connected to the pressure tube runs coaxially from the pressure tube ( The second end of 1) extends into which an internal thread arranged at the inner wall of the sleeve (7) engages into its external thread. The nut (9) is mounted non-detachably in the cylindrical inner opening (10) of the sleeve (7), the nut not only relative to the end of the inner opening (10) of the sleeve (7) facing the pressure tube (1) Also there is an axial distance with respect to the end towards the connecting piece (8), and the screw has a radial expansion at its end facing away from the pressure tube (1), which is coaxially at the distance from the sleeve (7) At the farthest point of the pressure tube (1) abuts against the end face of the nut (9) facing away from the pressure tube (1).

Description

Piston cylinder equipment

technical field

The invention relates to a piston-cylinder arrangement with a pressure tube in which a piston is arranged axially displaceable, the piston leading outwards in a sealing manner at a first end of the pressure tube, the piston-cylinder arrangement having a pressure tube a sleeve at a second end opposite to the first end of the pressure tube, telescopically displaceable towards the pressure tube, which sleeve surrounds the pressure tube with a part of its length and is closed at its end facing away from the pressure tube, and A bushing carrying connection, wherein a threaded member fixedly connected to the pressure pipe is provided with an external thread extending coaxially from the second end of the pressure pipe, an internal thread arranged at the inner wall of the bushing engaging to its external thread middle.

Background technique

Such piston-cylinder arrangements are used, for example, to open lids, in particular the trunk lids of motor vehicles. The maximum length of the piston-cylinder arrangement can be increased or decreased as required by the relative rotation of the sleeve and the pressure tube by hand.

It is known in piston-cylinder devices of this type that the inner wall of the sleeve is provided with a thread, which is screwed onto the outer thread of the threaded part. The threaded part has a coaxial hole through which a threaded pin fixedly connected thereto at the second end of the pressure tube passes, onto which a nut is screwed at the free end, by means of which nut the threaded part is fixed to the pressure tube at the second end of .

However, the relative rotation of the sleeve and the pressure tube can also cause the sleeve to loosen from the pressure tube, so that the cover can move due to its own weight in the closing direction and cause damage to objects just in the area of the cover or even cause damage to objects in the area of the cover. Injury to persons in the covered area.

Contents of the invention

It is therefore the object of the present invention to provide a piston-cylinder arrangement of the type mentioned at the outset, which avoids this disadvantage with a simple construction and simple assembly.

This object is achieved according to the invention in that the nut is mounted non-detachably in the cylindrical inner opening of the sleeve, the nut not only relative to the end of the inner opening of the sleeve facing the pressure pipe but also to the end of the connecting piece. The ends are axially spaced, and the screw has at its end facing away from the pressure tube a radial expansion which abuts against the point of the nut facing away from the pressure tube in the position of the sleeve which is coaxially farthest from the pressure tube. end side.

With this configuration, the sleeve can be displaced relative to the pressure tube in the direction of extension of the piston-cylinder arrangement only up to a maximum stop of the radial extension. A detachment of the sleeve from the pressure tube and thus damage or injury due to the freely downwardly deflected cover is avoided.

Furthermore, conventional piston-cylinder arrangements can be retrofitted to the maximum adjustment length without modification by means of the embodiment according to the invention.

If the inner diameter of the sleeve is close to the outer diameter of the pressure tube, the sleeve is guided stably in its coaxial position on the pressure tube.

The above also takes place over the entire adjustment path of the sleeve when the pressure tube is partially surrounded by the sleeve over the entire stroke of the sleeve. At the same time, the penetration of dirt into the interior of the bushing is at least as far as possible prevented.

In a simple embodiment, the threaded part provided with the external thread can be a threaded spindle and its end facing the pressure tube can be fixedly connected to the second end of the pressure tube, for example by means of a screw connection.

For this purpose, a coaxial threaded pin is provided at the second end of the pressure tube, which in the case of an unextended piston-cylinder arrangement is used for the arrangement of the connecting piece, and on which the threaded screw can now be used with a coaxial The threaded hole is screwed onto the end of the threaded pin facing the pressure tube.

In its installed position, the nut can be fixed non-detachably in the inner opening of the bushing by means of a fastener acting radially outwardly through the wall of the bushing onto the nut.

If the wall of the sleeve is a closed wall in the area of the nut, the nut can neither be unintentionally nor unauthorized without being damaged and detach from the sleeve and distance the sleeve from the pressure tube. .

For this purpose, the fastening element can be a form-fitting or material-fitting fastening element.

The cohesive fastening may be, for example, radial laser welding through the wall of the sleeve.

The form-fitting fastening element can be, for example, a radially circumferential groove on the cylindrical outer surface of the nut, into which the wall of the sleeve is pressed radially.

In a manner that can be produced easily, the radial extension of the threaded part can be a stop washer, which is fastened at the end of the threaded part facing away from the pressure tube.

For this purpose, the end of the spindle facing away from the pressure tube can have an axially protruding pin, onto which a stop washer with a coaxial hole is placed and subsequently the end of the pin protruding from the coaxial hole is riveted .

In order to be able to detect the respective stroke position of the sleeve relative to the pressure tube, a window extending along the axial movement path of the marking arranged on the screw can be formed in the wall of the sleeve, through which the position of the marking can be shown And thus also shows the stroke position.

In the simplest form, the stop washer can form a marking here.

Description of drawings

Exemplary embodiments of the invention are shown in the drawings and described further below. The figure shows:

Figure 1 is the end region of the piston-cylinder arrangement in the extended position,

FIG. 2 is the end region of the piston-cylinder arrangement according to FIG. 1 in the retracted position.

detailed description

The illustrated piston-cylinder arrangement is designed to lift, for opening, a tailgate of the vehicle, which is pivotable about a horizontal axis, from a largely downwardly directed closed position into an open position. The piston-cylinder arrangement has a pressure tube 1 of an air spring, at a first end (not shown) of which a piston rod is guided sealingly outward, which carries a first connecting piece at its free end. The first connection part can be a universal joint, which can be fastened to the trunk lid or the body of the vehicle.

The shown second end of the pressure tube 1 is closed and has an axially protruding threaded journal 2 . The threaded spindle 3 is screwed onto the threaded journal 2 with a threaded bore 4 formed coaxially at one end thereof.

A nut 9 , for example made of plastic, is screwed onto the threaded spindle 3 .

The end of the lead screw 3 opposite the threaded hole 4 is designed as a rivet pin 5, the stop washer 6 with the coaxial hole is placed on the rivet pin and then the rivet pin is riveted to form the rivet head 16, so that the stop washer Plate 6 is fixedly connected to lead screw 3 .

The sleeve 7 , for example made of plastic, is axially open at its one end and closed at its other end and has a second connecting piece 8 designed as a universal joint. The inner opening 10 of the sleeve is formed in steps, wherein a step 11 with a larger diameter leads to the outside. An annular shoulder 13 is formed at the transition from the larger diameter step 11 to the smaller diameter step 12 . The diameter of the step 11 is equal to the diameter of the nut 9 at its cylindrical outer surface.

With its opening, the bushing 7 is pushed through the screw 3 and the nut 9 into the step 11 of larger diameter until the nut 9 abuts axially at the annular shoulder 13 which defines the mounting position of the nut 9 .

The nut 9 is then welded to the sleeve 7 by radial laser loading of the sleeve 7 in the region of the nut 9 .

The length of the sleeve 7 is such that the region of the second end of the pressure tube 1 always protrudes into the larger-diameter step 11 of the inner opening 10 of the sleeve, which has the same diameter.

In the installed state, which is not shown, the sleeve 7 is connected to the trunk lid or body part of the vehicle by means of the connecting piece 8 and thus secured against rotation. If the pressure tube 1 is now manually twisted about its longitudinal axis, the lead screw 3 also turns in the nut 9 and thus the sleeve 7 moves towards or away from the pressure tube 1 depending on the direction of rotation, thereby changing the position of the piston-cylinder arrangement total length.

This length adjustment is accomplished in one direction by the stop washer 6 abutting against the end side of the nut 9 facing away from the pressure tube 1 and in the other direction by the stop washer 6 at the bottom 14 of the inner opening 10 . limited.

A recess 15 is formed on this base 14 , which has a smaller diameter than the stop washer 6 but has a larger diameter than the rivet head 16 and has a greater axial extension than the rivet head 16 , so that The rivet head 16 can freely protrude into the recess 15 .

List of reference numerals

1 pressure tube

2 threaded journal

3 screw

4 threaded holes

5 rivet pins

6 Stop washer

7 bushings

8 connectors

9 nuts

10 inner opening

11 grand staircase

12 small steps

13 Ring shoulder

14 bottom

15 recessed part

16 Rivet heads.

Claims (10)

1. a kind of piston-cylinder equipment, with pressure pipe (1), piston can be arranged in the pressure pipe with axially elapsing, described Piston is hermetically outwards guided at the first end of the pressure pipe (1), and the piston-cylinder equipment has in the pressure Managing can be towards the pressure pipe (1) telescopically at the second end relative with the first end of the pressure pipe (1) of (1) The sleeve pipe (7) of passage, described sleeve pipe surrounds the pressure pipe (1), and the set using a part for the length of described sleeve pipe The end away from the pressure pipe (1) of pipe is closed, and described sleeve pipe bearer connection part (8), wherein, with the pressure pipe The second end being fixedly connected, equipped with externally threaded screw element coaxially from the pressure pipe (1) extends, and is arranged in described Internal thread at the inwall of sleeve pipe (7) is engaged in the external screw thread of the screw element, it is characterised in that nut (9) can not be dismantled Ground is installed in the cylindrical inner opening (10) of described sleeve pipe (7), and the nut is not only with respect to the described of described sleeve pipe (7) The end of the direction pressure pipe (1) of inner opening (10) but also relative to described in the direction of the inner opening of described sleeve pipe There is axial spacing the end of connector (8), and the screw element is in the end away from the pressure pipe (1) of the screw element With radial dilatation portion, the radial dilatation portion is in the position coaxially farthest apart from the pressure pipe (1) of described sleeve pipe (7) In be resisted against the nut (9) at the side of the pressure pipe (1).

2. piston-cylinder equipment according to claim 1, it is characterised in that the interior diameter of described sleeve pipe (7) is equal to described The overall diameter of pressure pipe (1).

3. piston-cylinder equipment according to any one of the preceding claims, it is characterised in that the pressure pipe (1) is in institute State on the whole stroke of sleeve pipe (7) and partly to be surrounded by described sleeve pipe (7).

4. piston-cylinder equipment according to claim 1, it is characterised in that equipped with the externally threaded screw element It is leading screw (3).

5. piston-cylinder equipment according to claim 4, it is characterised in that direction of the leading screw (3) in the leading screw The end of the pressure pipe (1) is fixedly connected with the second end of the pressure pipe (1).

6. piston-cylinder equipment according to claim 1, it is characterised in that installation of the nut (9) in the nut It is not fixed on removedly by fastener in the inner opening (10) of described sleeve pipe (7) in position, wherein the fastener It is applied to radially outwardly through the wall of described sleeve pipe (7) on the nut (9).

7. piston-cylinder equipment according to claim 6, it is characterised in that the wall of described sleeve pipe (7) is in the nut (9) Region in be closing wall.

8. piston-cylinder equipment according to claim 6, it is characterised in that the fastener is form fit or material Expect the fastener coordinated.

9. piston-cylinder equipment according to claim 1, it is characterised in that the radial dilatation portion of the screw element is Backstop pad (6), the backstop pad is fixed on the end away from the pressure pipe (1) of the screw element.

10. piston-cylinder equipment according to claim 1, it is characterised in that be configured with the wall of described sleeve pipe along The window for being axially moved path extension for the mark being arranged at the screw element.