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An adjusting device includes a piston cylinder unit with a cylinder having a piston and a piston rod movably arranged therein, the piston rod extending out of the cylinder. A piston rod guide includes a support element having a first part arranged in the cylinder and bearing axially against one part

An adjusting device includes a piston cylinder unit with a cylinder having a piston and a piston rod movably arranged therein, the piston rod extending out of the cylinder. A piston rod guide includes a support element having a first part arranged in the cylinder and bearing axially against one part of the cylinder and a second part connected to the first part. An annular seal arranged between the second part of the support element and the interior of the cylinder such that pressure in the cylinder acts on the seal which bears on the second part of the support element. The connection between the first and second parts of the support element is releasable when the force of the annular seal bearing on the support element exceeds a bearing force limit. The first and second parts of the support elements move telescopically from a normal position to an overload position when the connection is released and reduce the axial length of the support element. A stop supported on the first part protrudes through said second part and is proximate the annular seal in the normal position.

대표청구항 ▼

1. An adjusting element, comprising:a cylinder having two ends and an inner wall defining an interior space containing a pressurized medium; a piston rod axially displaceably arranged in said cylinder and connectable to a piston, said piston rod extending through one of the two ends of said cylinder

1. An adjusting element, comprising:a cylinder having two ends and an inner wall defining an interior space containing a pressurized medium; a piston rod axially displaceably arranged in said cylinder and connectable to a piston, said piston rod extending through one of the two ends of said cylinder; an annular seal surrounding said piston rod having an inner radially encircling circumference sealingly bearing against said piston rod and an outer radially encircling circumference sealingly bearing against the inner wall of said cylinder, said annular seal having a side facing the interior space acted upon by a pressure of said pressurized medium; and a supporting element, wherein a side of said annular seal facing away from said interior space is supported on said supporting element, an end of said supporting element facing away from said annular seal being supported on a part of said cylinder, wherein said supporting element is telescopically deformable from a normal position to an overload position to reduce an axial length of said supporting element when a bearing force of said annular seal against said supporting element exceeds a bearing force limit, a passage between said interior space of said cylinder and ambient surroundings of said cylinder being opened in said overload position, said supporting element having a first part arranged in said cylinder and a second part connected to said first part in the normal position and movable toward said first part to the overload position, said annular seal bearing on said second part, said support element having a stop with a first end supported on said first part and a second end protruding axially through said second part to a position proximate said annular seal. 2. The adjusting element of claim 1, wherein said first and second parts of said support element arc connected to each other by a frictional connection in the normal position, said frictional connection being releasable when the bearing force of said annular seal against said supporting element exceeds the bearing force limit.3. The adjusting element of claim 1, wherein said first and second parts of said support element are connected to each other by a form-fitting connection in the normal position, said form-fitting connection being releasable when the bearing force of said annular seal against said supporting element exceeds the bearing force limit.4. The adjusting element of claim 1, wherein said first and second parts of said support element are connected to each other at a breaking point in the normal position, said connection being releasable such that said breaking point breaks when the bearing force of said annular seal against said supporting element exceeds the bearing force limit.5. The adjusting element of claim 1, wherein said annular seal comprises one of an inner sealing lip bearing against said piston rod and an outer sealing lip bearing against said inner wall of said cylinder, wherein said stop extends toward said one of said inner sealing lip and said outer sealing lip.6. The adjusting element of claim 1, wherein said annular seal is made of a first material and further comprises a stabilizing ring made of a second material that is less flexible than said first material, said stabilizing ring being arranged such that said stop is extendable past said stabilizing ring on one of a radially inner and a radially outer side of said stabilizing ring when said support ring moves from the normal position to the overload position.7. The adjusting element of claim 6, wherein said stop comprises a pin-shaped ram made of steel.8. The adjusting element of claim 6, wherein said stop comprises an annular sleeve surrounding said piston rod.9. The adjusting element of claim 1, wherein said stop comprises a pin-shaped ram made of steel.10. The adjusting element of claim 1, wherein said stop comprises an annular sleeve surrounding said piston rod.11. The adjusting ring of claim 1, wherein said stop is fixedly connected with said first part of said support element.12. The adjusting element of claim 1, wherein said stop is formed as an integral piece with said first part of said support element.13. The adjusting element of claim 1, wherein said first and second part comprise first and second tube sections, said first and second tube section arranged axially one behind the other and are connected by a connection at mutually facing end regions in the normal position, said connection being releasable when a bearing force of said annular seal against said supporting element exceeds a bearing force limit, said first and second tube sections being pushed telescopically into one another when said support element moves to said overload position.14. The adjusting element of claim 13, wherein said supporting element comprises a piston rod guide having an inner circumferential surface bearing against said piston rod and an outer circumferential surface bearing against said inner wall.15. The adjusting element of claim 14, wherein at least one of the first and second parts of the support element comprises one of a radially decreasing and a radially expanding collar on an end facing away from the other one of the first and second parts.16. The adjusting element of claim 13, wherein the first part is axially supported on an end wall of said cylinder, said end wall of said cylinder defining an opening through which said piston rod extends.17. The adjusting element of claim 13, wherein at least one of the first and second parts of the support element comprises one of a radially decreasing and a radially expanding collar on an end facing away from the other one of the first and second parts.18. The adjusting element of claim 16, wherein said first tube section comprises an outer telescopic section and said second tube section comprises an inner telescopic section, wherein an outer diameter of said second tube section is smaller than the diameter of said opening through which said piston rod extends.19. An adjusting element, comprising:a cylinder having two ends and an inner wall defining an interior space containing a pressurized medium; a piston rod axially displaceably arranged in said cylinder and connectable to a piston, said piston rod extending through one of the two ends of said cylinder; an annular seal surrounding said piston rod having an inner radially encircling circumference sealingly bearing against said piston rod and an outer radially encircling circumference sealingly bearing against the inner wall of said cylinder, said annular seal having a side facing the interior space acted upon by a pressure of said pressurized medium; and a supporting element, wherein a side of said annular seal facing away from said interior space is supported on said supporting element, an end of said supporting element facing away from said annular seal being supported on a part of said cylinder, wherein said supporting element is telescopically deformable from a normal position to an overload position to reduce an axial length of said supporting element when a bearing force of said annular seal against said supporting element exceeds a bearing force limit, a passage between said interior space of said cylinder and ambient surroundings of said cylinder being opened in said overload position, said supporting element having a first part supported axially on an end wall of said cylinder and a second part connected to said first part in the normal position and movable toward said first part to the overload position, said annular seal bearing on said second part, said end wall of said cylinder defining an opening through which said piston rod extends, said support element having a stop with a first end supported on said end wall of said cylinder and a second end protruding axially through said second part to a position proximate said annular seal. 20. The adjusting element of claim 19, wherein said first and second parts of said support element are connected to each other by a frictional connection in the normal position, said frictional connection being releasable when the bearing force of said annular seal against said supporting element exceeds the bearing force limit.21. The adjusting element of claim 19, wherein said first and second parts of said support element are connected to each other by a form-fitting connection in the normal position, said form-fitting connection being releasable when the bearing force of said annular seal against said supporting element exceeds the bearing force limit.22. The adjusting element of claim 19, wherein said first and second parts of said support element are connected to each other at a breaking point in the normal position, said connection being releasable such that said breaking point breaks when the bearing force of said annular seal against said supporting element exceeds the bearing force limit.23. The adjusting element of claim 19, wherein said annular seal comprises one of an inner sealing lip bearing against said piston rod and an outer sealing lip bearing against said inner wall of said cylinder, wherein said stop extends toward said one of said inner sealing lip and said outer sealing lip.24. The adjusting element of claim 19, wherein said annular seal is made of a first material and further comprises a stabilizing ring made of a second material that is less flexible than said first material, said stabilizing ring being arranged such that said stop is extendable past said stabilizing ring on one of a radially inner and a radially outer side of said stabilizing ring when said support ring moves from the normal position to the overload position.25. The adjusting element of claim 24, wherein said stop comprises a pin-shaped ram made of steel.26. The adjusting element of claim 24, wherein said stop comprises an annular sleeve surrounding said piston rod.27. The adjusting element of claim 19, wherein said stop comprises a pin-shaped ram made of steel.28. The adjusting element of claim 19, wherein said stop comprises an annular sleeve surrounding said piston rod.29. The adjusting ring of claim 19, wherein said stop is fixedly connected with said first part of said support element.30. The adjusting element of claim 19, wherein said stop is formed as an integral piece with said first part of said support element.31. The adjusting element of claim 19, wherein said first and second part comprise first and second tube sections, said first and second tube section arranged axially one behind the other and are connected by a connection at mutually facing end regions in the normal position, said connection being releasable when a bearing force of said annular seal against said supporting element exceeds a bearing force limit, said first and second tube sections being pushed telescopically into one another when said support element moves to said overload position.32. The adjusting element of claim 31, wherein said supporting element comprises a piston rod guide having an inner circumferential surface bearing against said piston rod and an outer circumferential surface bearing against said inner wall.33. The adjusting element of claim 32, wherein at least one of the first and second parts of the support element comprises one of a radially decreasing and a radially expanding collar on an end facing away from the other one of the first and second parts.34. The adjusting element of claim 31, wherein at least one of the first and second parts of the support element comprises one of a radially decreasing and a radially expanding collar on an end facing away from the other one of the first and second parts.35. The adjusting element of claim 31, wherein said first tube section comprises an out telescopic section and said second tube section comprises an inner telescopic section, wherein an outer diameter of said second tube section is smaller than the diameter of said opening through which said piston rod extends.