JP2012177475A - Piston cylinder unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas strut device that enables selection between opening up to an intermediate position and opening up to an open position with a simple structure.SOLUTION: A piston cylinder unit includes: a first end 3; a second end 4, a cylinder 2 filled with a fluid; a piston 11 which is arranged slidably in the cylinder 2 to divide the cylinder into a first operation room 9 close to the first end 3 and a second operation room 10 far from the first end 3; and a piston 26 which is arranged slidably in the cylinder 2 to divide the cylinder 2 into a first partial operation room 24 far from the second end 4 and a second partial operation room 25 close to the second end 4. Female screws 27, 36 cooperating with a male screw 23 formed on the piston 26 partitioning off the first and the second partial operation rooms 24, 25 are provided in areas of the first and the second partial operation rooms 24, 25, and the piston 26 can have its position adjusted in an axial direction and along a center vertical axis A using screw coupling thereof.

Description

  The present invention includes a central longitudinal axis, a first end, a second end, a cylinder filled with fluid, and a first operation that is slidably disposed within the cylinder and closes the cylinder to the first end. A piston that divides the chamber into a second working chamber remote from the first end, a first partial working chamber and a second piston slidably disposed in the cylinder and distant from the second end. A further piston that divides into a second partial working chamber close to the end, a guide / sealing device at the first end concentric with respect to the central longitudinal axis, arranged in the piston separating the two working chambers and penetrating the first working chamber At the second end concentrically with respect to the central longitudinal axis through the second partial working chamber, arranged in a piston rod that communicates with the piston rod outward in a sealed manner by the piston, and through the second partial working chamber Cylinder sealed with a guide / sealing device It relates to a piston-cylinder unit comprising a piston rod which leads out of the.

  This type of piston / cylinder unit is used in many fields, for example, in lids, hoods, doors, etc. of automobiles, furniture, machines, etc., for the purpose of relatively moving various structural parts relative to other structural parts.

  In the case of a lid, in particular an automobile trunk lid, it is often desirable to move the lid only to an intermediate position, not necessarily to its open position, by means of a piston / cylinder unit.

  One reason for this is, for example, to park the car in a parking lot with a low ceiling, that is, a parking lot where the lid may hit the ceiling when the lid is opened to the open position.

  Another reason is that some car users do not have enough upper back to close the opened lid.

  The object of the present invention is to provide a gas strut device of the type mentioned at the outset, which makes it possible to select with a simple structure whether to open to an intermediate position or to an open position.

  According to the present invention, an internal thread is provided in the region of the partial working chamber in the present invention to cooperate with a male thread formed on a piston that separates the two partial working chambers. This is solved by being adjustable in position along the central longitudinal axis.

  In one advantageous form, an internal thread is formed on the inner wall of the cylinder, which allows a simple installation.

  Alternatively, an internal thread is formed in a threaded sleeve arranged in the cylinder, which makes it possible to use parts already manufactured in mass production.

  In a further advantageous configuration, the second working chamber is connected to the first and second partial working chambers, so that, when made as a gas strut, the adjustment of the position of the piston separating the two partial working chambers is possible. It makes it much easier to use gas under pressure.

  Alternatively, the second working chamber is separated from the first partial working chamber. This makes it possible to fill the working chamber and the partial working chamber with different gas pressures or different media, such as nitrogen or oil.

  The second working chamber is advantageously separated from the first partial working chamber by a disc-shaped partition. In this case, an existing mass-produced product can be used for the partition wall.

  If the cylinder of the piston / cylinder unit is divided into a first cylinder and a second cylinder, a further preferred arrangement is obtained.

  In that case, one of the cylinders has a cylinder end facing the first end, and the other cylinder has another cylinder end facing the second end.

  In that case, in an advantageous manner, the ends of the cylinders are interconnected facing each other.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

It is sectional drawing of 1st Embodiment of the piston cylinder unit by this invention. It is sectional drawing of 2nd Embodiment of the piston and cylinder unit by this invention. It is sectional drawing of 3rd Embodiment of the piston cylinder unit by this invention. It is sectional drawing of 4th Embodiment of the piston and cylinder unit by this invention.

  FIG. 1 shows a longitudinal section of a piston / cylinder unit 1 which is here illustrated by way of example as a gas strut or damper. The piston / cylinder unit 1 includes a cylinder 2 having a central longitudinal axis A and having a first end 3 and a second end 4. A seal / guide device 5 is arranged at the first end 3 of the cylinder 2 so that the first piston rod 6 is concentrically sealed with respect to the central longitudinal axis A and is outwardly movable in the axial direction. Be guided to. A first connector 7 in the form of a ball cup is arranged at the end of the piston rod 6 protruding outward. Using this first connector 7, the piston / cylinder unit 1 can be placed on a stationary structural part (not shown) such as a vehicle body or a pivoting structural part that can pivot relative to the stationary structural part, such as a trunk lid or Can be fastened to the engine hood.

  The piston rod 6 is provided with a seal ring 8 at the end opposite to the first connector 7, and the cylinder 2 is connected to the first operating chamber 9 on the piston rod side and the second operating chamber far from the piston rod. The piston 11 divided into 10 is arranged. Although only schematically depicted here, the piston 11 carries a fluid, preferably a gas in the form of nitrogen under pressure, from the first working chamber 9 to the second working chamber 10 or vice versa. You may provide the communicating path which enables it to flow through the direction. For example, one further communication path may be provided by a groove 12 that runs in the axial direction in the cylinder 2.

  The seal / guide device 5 includes a guide bush 13 that is preferably arranged concentrically with respect to the central longitudinal axis A, and a seal ring 15 that is supported relative to the guide bush 13. At the first end 3, the flange 14 of the cylinder 2 covers the outside of the guide bush. The seal ring 15 includes a first seal lip 16 that is in contact with the piston rod 6 on the one hand and an inner wall of the cylinder 2 on the other hand in order to hermetically seal the first operation chamber 9 with respect to the outer peripheral surface of the cylinder 2. A second seal lip 17 is provided.

  In addition, the seal / guide device 5 may include another support component 18. This may be secured in the cylinder chamber by one or more indentations 19 in the cylinder 2 which those skilled in the art refer to as beads or cleats.

  A further seal / guide device 20 is arranged at the second end 4 of the cylinder 2, which is opposite the first end 3. The seal / guide device 20 seals the second piston rod 21 concentrically with respect to the central longitudinal axis A, and guides it outward so as to freely move in the axial direction. Here, a second connector 22 in the form of a ball cup is arranged at the end of the piston rod 21 protruding outward. The piston / cylinder unit 1 can be fixed to the other structural part (not shown) by using the second connector 22.

  A piston 26 having a male screw 23 is disposed at the end of the second piston rod 21 opposite to the second connector 22. The piston 26 divides the second working chamber 10 in the cylinder 2 into a first partial working chamber 24 far from the second end 4 and a second partial working chamber 25 close to the second end 4. . In the region of the first partial operation chamber 24 and the second partial operation chamber 25, the inner wall of the cylinder 2 has a female screw 27 extending in the axial direction. The piston 26 can move relative to the cylinder 2 along the central longitudinal axis A in the axial direction via the female screw 27. Since the second working chamber 10, the first partial working chamber 24, and the second partial working chamber 25 are connected to each other, equivalent pressures dominate them.

  The seal / guide device 20 also comprises a guide bush 28 arranged concentrically with respect to the central longitudinal axis A, and a seal ring 30 supported against this guide bush 28, with a guide at the second end 4. The flange 29 of the cylinder 2 covers the outside of the bush. The seal ring 30 includes a first seal lip 31 that is in contact with the second piston rod 21 on the one hand and the cylinder on the other hand in order to hermetically seal the second partial operation chamber 25 with respect to the outer peripheral surface of the cylinder 2. A seal lip 32 in contact with the two inner walls.

  The seal / guide device 20 includes another support component 33. This can be secured in the cylinder chamber using one or more indentations 34 in the cylinder 2, if desired.

  FIG. 2 shows a further embodiment of the present invention. The piston / cylinder unit 1 of FIG. 2 is substantially the same as the embodiment shown in FIG. 1, wherein parts having the same function have the same reference numerals as described for FIG. .

  In the region of the first partial working chamber 24 and the second partial working chamber 25, a threaded sleeve 35 having an internal thread 36 extending in the axial direction is arranged. Via this threaded sleeve 35, the piston 26 can move relative to the cylinder 2 along the central longitudinal axis A in the axial direction. At this time, the threaded sleeve 35 is supported by the support component 33 on the front side facing the second end 4, and on the front side opposite to this, the one or more recesses 37 in the cylinder 2 are used for the first side. It is fixed in the region of the partial operation chamber 24 and the second partial operation chamber 25. The recess 37 may be formed in any region of the first partial operation chamber 24 and the second partial operation chamber 25 in the cylinder 2 as an alternative or in addition.

  In the embodiment shown in FIG. 3, the second working chamber 10 is separated from the first partial working chamber 24 by a disk-shaped partition wall 38. The partition wall 38 has a groove 39 that goes around along the envelope surface, and a seal ring 40 is fitted therein. The partition wall 38 is fastened in the inner chamber of the cylinder 2 by the recess 41. Thereby, it is possible to apply a different pressure or a different medium, such as gas or oil, to the first working chamber 9 and the second working chamber 10 from the first partial working chamber 24 and the second partial working chamber 25. It is. At that time, the first partial operation chamber 24 and the second partial operation chamber 25 may be dominated by the ambient pressure.

  FIG. 4 shows a further embodiment of the present invention. Here, the piston / cylinder unit 1 includes a first cylinder 2 ′ and a second cylinder 2 ″ arranged coaxially with each other. The cylinder 2 ′ has a cylinder end opposite to the first end 3. 42, and the cylinder 2 ″ includes a cylinder end 43 on the side opposite to the second end 4. The cylinder end 42 and the cylinder end 43 are interconnected at positions facing each other, for example, by welding or screw connection. The inner wall of the cylinder 2 ″ again has an internal thread 27.

  Obviously, in FIGS. 3 and 4, the internal thread 27 formed on the inner wall of the cylinder 2 or cylinder 2 ″ may be eliminated and a threaded sleeve 35 may be fitted instead.

  In the illustrated embodiment, it is possible to change the position of the cylinder 2 or the cylinder 2 ″ with respect to the second connector 22. This allows the cylinder 2 ″ with the piston and cylinder unit 1 to be incorporated. At the same time, the length can be adjusted by rotation on the cylinder 2 or cylinder 2 ′ side. In the disassembled state, the adjustment can be performed by the rotation on the second piston rod 21 side, so that the opening height of the swing structure component can also be adjusted.

DESCRIPTION OF SYMBOLS 1 Piston cylinder unit 2 Cylinder 3 1st end 4 2nd end 5 Seal / guide apparatus 6 Piston rod 7 1st connection tool 8 Seal ring 9 1st action | operation chamber 10 2nd action | operation chamber 11 Piston 12 Groove DESCRIPTION OF SYMBOLS 13 Guide bush 14 Flange 15 Seal ring 16 1st seal lip 17 2nd seal lip 18 Supporting part 19 Depression 20 Seal / guide apparatus 21 Piston rod 22 2nd connection tool 23 Male screw 24 1st partial operation chamber 25 1st 2 Partial operation chamber 26 Piston 27 Female thread 28 Guide bush 29 Flange 30 Seal ring 31 First seal lip 32 Second seal lip 33 Supporting part 34 Recess 35 Threaded sleeve 36 Female thread 37 Recess 38 Bulkhead 39 Groove 40 Seal ring 41 Hollow A center vertical axis

Claims (9)

A central vertical axis (A);
A first end (3);
A second end (4);
A cylinder (2) filled with fluid;
A first working chamber (9) close to the first end (3) and a second working chamber (2) far from the first end (3), slidably disposed in the cylinder (2). 10) a piston (11) that divides the cylinder (2);
The cylinder (2, 2 ″) is slidably disposed in the cylinder (2, 2 ″), and the cylinder (2, 2 ″) is distant from the second end (4). A further piston (26) dividing into a second working chamber (25) close to the end (4) of the
The piston (11) that separates the first and second working chambers is disposed through the first working chamber (9) and is concentric with the central longitudinal axis (A). A piston rod (6) sealed in 3) by a guide / seal device (5) and leading out of the cylinder (2);
The second and second partial operation chambers are arranged on a piston (26), and penetrate the second partial operation chamber (25) to be concentric with the central longitudinal axis (A). A piston rod (21) sealed at the end (4) by a guide / seal device (20) and leading out of the cylinder (2, 2 ″);
A piston / cylinder unit (1) comprising:
A male screw (23) formed on the piston (26) dividing the first and second partial operation chambers (24, 25) in the region of the first and second partial operation chambers (24, 25). ), And the piston (26) is axially adjustable along the central longitudinal axis (A) using this threaded connection. Piston / cylinder unit.   2. The piston / cylinder unit according to claim 1, wherein the female thread (27) is formed on an inner wall of the cylinder (2, 2 ″).   2. A piston / cylinder unit according to claim 1, characterized in that the female thread (36) is formed in a threaded sleeve (35) arranged in the cylinder (2, 2 ″).   The piston according to any one of claims 1 to 3, wherein the second working chamber (10) is connected to the first and second partial working chambers (24, 25).・ Cylinder unit.   The piston / cylinder unit according to any one of claims 1 to 3, wherein the second working chamber (10) is separated from the first partial working chamber (24).   6. The piston / cylinder unit according to claim 5, wherein the second working chamber (10) is separated from the first partial working chamber (24) by a disc-shaped partition wall (38). .   6. Piston according to claim 5, characterized in that the cylinder (2) of the piston / cylinder unit (1) is divided into a first cylinder (2 ') and a second cylinder (2 ").・ Cylinder unit.   The cylinder (2 ′) has a cylinder end (42) on the opposite side of the first end (3), and the cylinder (2 ″) is on the opposite side of the second end (4). 8. The piston / cylinder unit according to claim 7, further comprising a cylinder end (43).   9. The piston / cylinder unit according to claim 8, wherein the cylinder ends (42, 43) are connected to each other at positions facing each other.

Images