Lift system having a signal generation unit arranged on a lift car of the lift system

Abstract

A vibration damper with an adjustable damping force may comprise an inner cylinder having at least one working chamber, an outer cylinder that surrounds the inner cylinder, and at least one damping valve element that in terms of flow is connected via a flow connection to the working chamber. An adapter sleeve may guide the flow connection, with the adapter sleeve being inserted in the inner cylinder on an internal circumference of the inner cylinder. The flow connection may be guided into the damping valve element by way of a flow opening that is configured in a wall of the inner cylinder.

Claims

1.-9. (canceled)

10. A vibration damper having an adjustable damping force, the vibration damper comprising: an inner cylinder having a working chamber; an outer cylinder that surrounds the inner cylinder; a damping valve element disposed on the outer cylinder, wherein with respect to flow the damping valve element is connected to the inner cylinder via a flow connection; and an adapter sleeve that guides the flow connection, the adapter sleeve being inserted in the inner cylinder on an internal circumference of the inner cylinder.

11. The vibration damper of claim 10 wherein the flow connection is guided into the damping valve element by way of a flow opening that is configured in a wall of the inner cylinder.

12. The vibration damper of claim 11 wherein the flow connection is guided by way of a connector port from the adapter sleeve to the damping valve element, the connector port being inserted in the flow opening.

13. The vibration damper of claim 12 wherein the connector port in a sealing manner is inserted in a bore configured in a circumferential wall of the adapter sleeve.

14. The vibration damper of claim 13 wherein the connector port is sealed relative to the adapter sleeve by way of an annular sleeve.

15. The vibration damper of claim 13 wherein the bore is a first bore and the connector port is a first connector port, the vibration damper comprising a second bore for inserting a second connector port, wherein the second bore is configured in the circumferential wall of the adapter sleeve.

16. The vibration damper of claim 10 wherein each axial end of the adapter sleeve is sealed relative to an internal face of the inner cylinder by way of an annular seal.

17. The vibration damper of claim 10 wherein the adapter sleeve is positioned in the inner cylinder so as to be displaceable in a longitudinal direction of the inner cylinder.

18. The vibration damper of claim 10 wherein the adapter sleeve is comprised of plastic.

Description

[0011] The invention with further features, details, and advantages will be explained hereunder by means of the appended figures. The figures herein only illustrate exemplary embodiments of the invention. In the figures:

[0012] FIG. 1 shows a triple-tube vibration damper having an adjustable damping force in a schematic illustration; and

[0013] FIG. 2 shows a detailed illustration of the lower region of a vibration damper, having a damping valve element linked according to the invention.

[0014] FIG. 1 shows a vibration damper 10 having an adjustable damping force in a sectional and schematic illustration. The vibration damper 10 comprises an inner cylinder 12 which is filled with a damping means and in which a piston 16 attached to a piston rod 14 is guided so as to be axially movable. The direction of movement of the piston 16 can be defined as a longitudinal direction of the vibration damper 10. The upper end of the cylinder 12 is closed by a piston rod guide 18, and the lower end of the cylinder 12 is closed by a base 20 which may be configured as a base valve body. A working chamber 22 is formed in the inner cylinder 12. The piston divides the working chamber 22 into a piston-rod-proximal working chamber 22.sub.1 and a piston-rod-distal working chamber 22.sub.2. An intermediate tube 24 is disposed circumferentially about the inner cylinder 12 such that the cylinder 12 and the intermediate tube 24 form an annular space 26. Openings 32 by way of which the damping means can overflow from the inner cylinder 12 into the annular space 26 are configured in the wall of the inner cylinder 12.

[0015] The inner cylinder 12 and the intermediate tube 24 are conjointly encased by an outer cylinder 28 such that a further annular space 30 is formed between the outer cylinder 28 and the inner cylinder 12, or the intermediate tube 24, respectively.

[0016] The vibration damper 10 can furthermore possess two in each case adjustable damping valve elements 34.sub.1, 34.sub.2. The damping valve elements 34.sub.1, 34.sub.2 for in each case one of the piston movements can be operatively connected to the piston-rod-proximal working chamber 22.sub.1 and the piston-rod-distal working chamber 22.sub.2. The damping valve elements 34.sub.1, 34.sub.2 can be held on the outer cylinder 28. The damping valve element 34.sub.1 serves for damping the deployment movement of the piston rod 14, or of the piston 16, respectively, in the rebound stage, and the damping valve element 34.sub.2 serves for damping the retraction movement of the piston rod 14, or of the piston 16, in the pressure stage of the vibration damper 10.

[0017] In a deployment movement of the piston rod 14, or of the piston 16, respectively, the damping means by way of the openings 32 and the annular space 26 is conveyed from the piston-rod-proximal working chamber 22.sub.1 into the associated damping valve element 34.sub.1, and by way of the outflow side of the damping valve element 34.sub.1 is conveyed into the outer annular space 30. In a retraction movement of the piston rod 14, or of the piston 16, respectively, the damping means is conveyed from the piston-rod-distal working chamber 22.sub.2 directly into the associated damping valve element 34.sub.2, and by way of the outflow side of the damping valve element 34.sub.2 is conveyed into the outer annular space 30. An overflow of damping means from the annular space 30 through overflow bores in the piston 16 into the piston-rod-proximal working chamber 22.sub.1 takes place in parallel. The damping valve elements 34.sub.1, 34.sub.2, according to their assignment, in terms of flow are consequently connected either to the piston-rod-proximal working chamber 22.sub.1 or the piston-rod-distal working chamber 22.sub.2.

[0018] FIG. 2 shows a detailed illustration of the lower region of a vibration damper 10, having the damping valve element 34.sub.2 of the pressure stage being linked to the inner cylinder 12 according to the invention. To this end, the flow connection from the inner cylinder 12, or the piston-rod-distal working chamber 22.sub.2, respectively, into the damping valve element 34.sub.2 is guided by way of an adapter sleeve 38 which is inserted in the inner cylinder 12 so as to be on the internal circumference of the latter. It is in particular provided that the adapter sleeve 38 is completely introduced into the inner cylinder 12 and in the axial direction is preferably set at a clearance from the base valve body 20. This axial clearance from the base valve body 20 is advantageous to the extent that no unequivocal axial assembly position has to be provided for the adapter sleeve 38, the adapter sleeve 38 during the assembly procedure rather being able to slide in a self-acting manner to the final axial position.

[0019] The adapter sleeve 38 on both axial end regions is sealed in relation to an internal circumferential face of the inner cylinder 12 by way of a respective annular seal 36 which sits in a circumferential groove 40.

[0020] The flow connection from the inner cylinder 12 into the damping valve element 34.sub.2 is furthermore guided by way of a flow opening 42 which is configured in a wall of the inner cylinder 12. In the design embodiment presently shown, a connector port 46 herein is inserted into the flow opening 42 and into a bore 44 which is configured in a circumferential wall of the adapter sleeve 38. The connector port 46 is inserted in the bore 44 so as to be sealed by way of an annular seal 48 and thus sealed in relation to the adapter sleeve 38.

[0021] The linking of the damping valve element 34.sub.2 of the pressure stage to the inner cylinder 12 according to the invention is advantageous in particular with a view to assembling the vibration damper 10 since no unequivocal axial and circumferential assembly position has to be initially provided for pushing the adapter sleeve 38 into the inner cylinder 12. In terms of the assembly of the adapter sleeve 38 it is considered entirely sufficient for the adapter sleeve 38 to be initially only positioned in a preliminary manner in the axial direction and in terms of the circumferential position of said adapter sleeve 38 such that the bore 44 in the adapter sleeve and the flow opening 42 in the inner cylinder 12 are brought to be only partially congruent.

LIST OF REFERENCE SIGNS

[0022] 10 Vibration damper [0023] 12 Cylinder [0024] 14 Piston rod [0025] 16 Piston [0026] 18 Piston rod guide [0027] 20 Base [0028] 22 Working chamber [0029] 24 Intermediate tube [0030] 26 Annular space [0031] 28 Cylinder [0032] 30 Annular space [0033] 32 Opening [0034] 34 Damping valve element [0035] 36 Annular seal [0036] 38 Adapter sleeve [0037] 40 Circumferential groove [0038] 42 Flow opening [0039] 44 Bore [0040] 46 Connector port [0041] 48 Annular seal