IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0922105
(2004-08-20)
|
우선권정보 |
DE-103 39 188(2003-08-22) |
발명자
/ 주소 |
- Keller,Arno
- Heydenreich,Bertram
- Krog,Andreas
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
11 |
초록
▼
A gas spring comprises a cylindrical casing, in which a piston rod is guided for displacement concentric of a central longitudinal axis. A damping piston is mounted on the piston rod, dividing the interior of the casing into two sectional casing chambers. A filling of compressed gas is provided insi
A gas spring comprises a cylindrical casing, in which a piston rod is guided for displacement concentric of a central longitudinal axis. A damping piston is mounted on the piston rod, dividing the interior of the casing into two sectional casing chambers. A filling of compressed gas is provided inside the casing. A damping device is provided for velocity-dependent damping of a motion of stroke of the damping piston and another damping device is provided for path-dependent damping of a motion of stroke of the damping piston. The result is a gas spring of excellently controllable stroke behaviour.
대표청구항
▼
What is claimed is: 1. A gas spring, comprising a cylindrical casing (1) which has an inside wall ( 20), a central longitudinal axis (5), a bottom (2) and an end (4) opposite the bottom (2); a piston rod (6) which is concentric of the central longitudinal axis (5) and which is extended from the end
What is claimed is: 1. A gas spring, comprising a cylindrical casing (1) which has an inside wall ( 20), a central longitudinal axis (5), a bottom (2) and an end (4) opposite the bottom (2); a piston rod (6) which is concentric of the central longitudinal axis (5) and which is extended from the end (4) through a guide and seal unit (8) and out of the casing (1) ; a damping piston (9) which is disposed on an end, inside the casing (1), of the piston rod (6), dividing the casing (1) into two sectional casing chambers (10, 11 ); a filling of compressed gas inside the casing (1); a damping device (28a) for velocity-dependent damping of a motion of stroke of the damping piston (9), said velocity-dependent damping device (28a) comprising at least one piston member (12, 16) which is tightly mounted on the piston rod (6), an annular piston (23) which is displaceable in the direction of the axis (5) relative to the at least one piston member (12, 16), and at least one elastic valve disk (25, 26) which is disposed between the at least one piston member (12, 16) and the annular piston (23) and which bears sealingly against the at least one piston member (12, 16) when a given limit of stroke velocity is exceeded; and another damping device (45) for path-dependent damping of a motion of stroke of the damping piston (9), said path-dependent damping device (45) comprising a damping fluid passage with a path-dependently varying cross section between the two sectional casing chambers (10, 11), said damping fluid passage being a longitudinal groove ( 45) on the inside wall (20) of the casing (1), said longitudinal groove (45) substantially extending between a position of maximum insertion and a position of maximum extension of the damping piston (9) and comprising at least a first groove area (48) having a varying cross section and being allocated to the position of maximum insertion, a second groove area (49) having a constant cross section and adjoining to the first groove area (48), a third groove area (50) having a varying cross section and adjoining to the second groove area (49), and a fourth groove area (51) having a constant cross section and adjoining the third groove area (50). 2. A gas spring according to claim 1, wherein the path-dependent damping device (45) has means for stronger damping of the motion of stroke in an area of two end positions (46) thereof than in an area (51) of the remaining stroke. 3. A gas spring according to claim 1, wherein an embodiment of the path-dependent damping device (45) has means for multi-stage variation of damping of the motion of stroke. 4. A gas spring according to claim 1, wherein the cross section of the damping-fluid passage in the area (48, 53) of one of the two end positions (46) of the stroke is smaller than it is in the area (51) of the remaining stroke. 5. A gas spring according to claim 1, wherein variation of the cross section of the damping device (45) takes place in several steps (48, 50). 6. A gas spring according to claim 1, wherein the longitudinal groove (45) has a varying width for cross-sectional variation. 7. A gas spring according to claim 1, comprising a damping fluid in the form of temperature-resistant oil. 8. A gas spring according to claim 7, comprising a synthetic-based damping fluid. 9. A gas spring according to claim 7, comprising a silicone-based damping fluid. 10. A gas spring according to claim 1, wherein the longitudinal groove (45) has a varying depth for cross-sectional variation. 11. A gas spring according to claim 1, wherein the longitudinal groove (45) has a varying width and a varying depth for cross-sectional variation. 12. A gas spring, comprising a cylindrical casing (1) which has an inside wall ( 20), a central longitudinal axis (5), a bottom (2) and an end (4) opposite the bottom (2); a piston rod (6) which is concentric of the central longitudinal axis (5) and which is extended from the end (4) through a guide and seal unit (8) and out of the casing (1) ; a damping piston (9) which is disposed on an end, inside the casing (1), of the piston rod (6), dividing the casing (1) into two sectional casing chambers (10, 11 ); a filling of compressed gas inside the casing (1); a damping device (28a) for velocity-dependent damping of a motion of stroke of the damping piston (9), said velocity-dependent damping device (28a) comprising at least one piston member (12, 16) which is tightly mounted on the piston rod (6), an annular piston (23) which is displaceable in the direction of the axis (5) relative to the at least one piston member (12, 16), and at least one elastic valve disk (25, 26) which is disposed between the at least one piston member (12, 16) and the annular piston (23) and which bears sealingly against the at least one piston member (12, 16) when a given limit of stroke velocity is exceeded; and another damping device (45) for path-dependent damping of a motion of stroke of the damping piston (9), said path-dependent damping device (45) comprising a damping fluid passage with a path-dependently varying cross section between the two sectional casing chambers (10, 11), said damping fluid passage being a longitudinal groove ( 45) on the inside wall (20) of the casing (1), said longitudinal groove (45) substantially extending between a position of maximum insertion and a position of maximum extension of the damping piston (9) and comprising at least a first groove area (48) having a varying cross section and being allocated to the position of maximum insertion, a second groove area (49) having a constant cross section and adjoining to the first groove area (48), a third groove area (50) having a varying cross section and adjoining to the second groove area (49), and a fourth groove area (51) having a constant cross section and adjoining the third groove area (50), wherein the longitudinal groove (45) comprises two side walls which at least partially make an angle (α) in the range of 120째.
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