• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    SUMMARY A gas spring (1) is described, which comprises a first part (2) defining a cylinder (3), which comprises a longitudinal axis (4) and which is closed in a first end (5) along the longitudinal axis (4). The gas spring also comprises a piston (6) which is movably arranged along the longitudinal axis (4) of the cylinder (3), a piston rod (7) which is connected to the piston (6) and which extends through the other end (8) of the cylinder, a separating piston (9) movably arranged along the longitudinal axis (4) of the cylinder (3) between the piston (6) and the first end (5), gas arranged in the cylinder (3) between the separating piston (9) and the first end ( 5), and liquid arranged between the separating piston (9) and the piston (6). The gas spring also comprises an expansion chamber (10) for the liquid and a pressure regulating device which is arranged to control liquid transport between the cylinder (3) and the expansion chamber (10) depending on the temperature, thereby pouring the force characteristic of the gas spring (1) substantially independent of the temperature. Fig. 1
    公开号:SE1050171A1
    申请号:SE1050171
    申请日:2010-02-24
    公开日:2011-08-25
    发明作者:Mikkel Rolf Olof Niia
    申请人:Stroemsholmen Ab；
    IPC主号:
    专利说明:

    Additional advantages are obtained with the features of the appended dependent claims.
    According to a first aspect of the invention, there is provided a gas spring comprising a first portion defining a cylinder which includes a longitudinal axis and which is closed at a first end along the longitudinal axis. The gas spring also comprises a piston which is movably arranged along the longitudinal axis of the cylinder, a piston rod which is connected to the piston and which extends through the other end of the cylinder, a separating piston which is movably arranged along the longitudinal axis of the cylinder between the piston and the first end. The gas spring also comprises gas arranged in the cylinder between the separating piston and the first end, and liquid arranged between the separating piston and the piston. The gas spring is characterized in that it also comprises an expansion chamber for the liquid and a pressure regulating device which is arranged to control liquid transport between the cylinder and the expansion chamber in dependence on the temperature in order thereby to pour the force characteristic of the gas spring substantially independent of the temperature.
    With a gas spring according to the invention, liquid will be removed from the cylinder when the gas spring is hot. This will lower the pressure in the cylinder and will thus reduce the spring force from the gas.
    Liquid transport between the cylinder and the expansion chamber can take place in many different ways, but preferably takes place by means of the pressure difference between the cylinder and the expansion chamber as driving force.
    The liquid is in most embodiments an oil, although it is not excluded within the scope of the invention to use liquids other than oils.
    The pressure control device may comprise a measuring fluid chamber, in which measuring fluid is arranged, and a pressure tube with a longitudinal axis in which a pressure shaft is movably arranged, the pressure shaft position in the pressure tube depending on the volume of the measuring fluid and the liquid transport between the cylinder and the expansion shaft . The position of the pressure shaft advantageously controls valves that allow flow to or from the expansion chamber. As the volume of the measuring liquid varies with temperature, the position of the pressure shaft will change with temperature. In the same way as for the liquid, the measuring liquid is preferably a measuring oil, although within the scope of the invention it is not excluded to use other measuring liquids.
    The measuring liquid chamber can be arranged in the piston rod. This is a space-saving location of the measuring fluid chamber, which thus does not require any space on the outside of the gas spring. It is of course possible to let the measuring liquid chamber be arranged on the outside of the gas spring, whereby transport of liquid between the measuring liquid chamber and the cylinder takes place through hoses. Once the liquid has been moved to the piston rod, it no longer affects the spring force in the gas spring.
    In the case that the measuring liquid chamber is arranged in the piston rod, the piston rod may comprise a piston rod cylinder, the measuring liquid chamber being arranged in a measuring liquid piston which is movably arranged in the cylinder in the piston rod. Gas is then advantageously arranged behind the measuring liquid piston so that the measuring liquid piston is affected by a force in the direction of the piston.
    In the case that the measuring liquid chamber is arranged in a measuring liquid piston, the expansion chamber can be arranged between the measuring liquid piston and the piston, the size of the expansion chamber depending on the position of the measuring liquid piston in relation to the piston. With such a device, the measuring liquid piston and thus also the liquid in the expansion chamber will be subjected to a pressure which is given by the gas pressure behind the measuring liquid piston.
    The pressure control device may comprise a valve device which is fixedly arranged in relation to the piston, which valve device comprises a control hole which coincides axially with the pressure pipe and in which the pressure shaft is movably arranged. The pressure shaft is thus controlled by both the pressure pipe and by the control hole.
    The position of the pressure shaft in the valve device controls the flow of liquid between the expansion chamber and the measuring liquid chamber.
    The valve device may comprise a first liquid line for conveying liquid from the cylinder to the expansion chamber, a first valve arranged in the first liquid line for controlling the flow of liquid through the first liquid line, a second liquid line for supplying liquid to the cylinder from the expansion chamber, and a second valve arranged in the second liquid line for controlling the flow of liquid through the second liquid line, the first valve and the second valve being controlled by the axial position of the pressure shaft in relation to the valve device. With two different liquid lines, a simpler solution is obtained than if the same valve can be switched between two different flow directions.
    Advantageously, a maximum of one of the valves is open for each axial position of the pressure shaft. This avoids problems with the flow resistance varying for the same flow direction. When no pressure control is required, both valves can be closed.
    Advantageously, the valves are combined with the non-return valves which ensure that flow can only take place in one direction for each liquid line.
    Each of the first valve and the second valve may comprise a ball, a valve seat and a spring arranged to press the ball against the valve seat, the valves being arranged to be opened by pushing the balls away from the valve seats, the pressure shaft comprising chamfers for each and one of the valves, the pressure shaft and valves being arranged so that each of the valves is closed when the associated bevel is directed towards the valve and open when the bevel is outside the valve and the pressure shaft thus pushes the associated ball away from the valve seat.
    With such an embodiment, the valve device is realized in a simple manner. It is of course possible to provide the valves in other ways as well.
    According to a second aspect of the present invention, there is provided a motor vehicle comprising a gas spring according to the first aspect of the present invention.
    A motor vehicle equipped with a gas spring according to the first aspect of the present invention will have driving characteristics which to a lesser extent dependent on the outside temperature are motor vehicles according to the prior art.
    Brief Description of the Drawings In the following, preferred embodiments of the invention will be described with reference to the accompanying drawings.
    Fig. 1 schematically shows a gas spring according to a preferred embodiment of the present invention. Fig. 2 shows on a larger magnification a part of a pressure regulating device in the gas spring in a first position.
    Fig. 3 shows in larger magnification a part of a pressure regulating device in the gas spring in a second position.
    Description of Preferred Embodiments of the Invention In the following description of preferred embodiments of the invention, the same reference numerals will be used for the same or similar features in the various figures. The figures are only schematic and the relationships between different dimensions in the figures may be different from those shown in the figures.
    Fig. 1 schematically shows a gas spring 1 according to a preferred embodiment of the present invention. The gas spring 1 comprises a first part 2 defining a cylinder 3 in which a gas is arranged, and a longitudinal axis 4. The cylinder is closed in a first end 5. The gas spring 1 also comprises a piston 6 which is movably arranged along the longitudinal axis 4 in the cylinder 3 and a piston rod 7 which is connected to the piston 6 and which extends through the other end of the cylinder 8. The gas spring also comprises a separating piston 9 which is movably arranged along the longitudinal axis 4 in the cylinder 3 between the piston 6 and the first end 5. In the gas spring 1, gas is arranged in the cylinder 3 between the separating piston 9 and the first end 5 and liquid is arranged between the separating piston 9 and the piston 6. The gas spring also comprises an expansion chamber 10 and a pressure regulating device which is arranged to control liquid transport between the cylinder and the expansion chamber 10 depending on the temperature in order to thereby keep the force characteristic of the gas spring 1 substantially independent of the temperature. The pressure regulating device in the embodiment shown in Fig. 1 comprises a measuring liquid piston 11 which is movably arranged along the longitudinal axis 4 in a piston rod cylinder 12 which in turn is arranged in the piston rod 7. In the measuring liquid piston 11 a measuring liquid chamber 13 is arranged, in which measuring liquid . Behind the measuring liquid piston 11 there is arranged gas which presses the measuring liquid piston 11 against the piston 6. The measuring liquid piston 11 comprises a pressure pipe 14, through which pressure pipe 14 measuring liquid is arranged to flow upon expansion of the measuring liquid. The pressure pipe 14 is arranged parallel to the longitudinal axis 4 and in the embodiment shown coincides with the longitudinal axis 4.
    A pressure shaft 15 is arranged in the pressure pipe 14. The pressure control device also comprises a valve device 16 which is fixedly arranged in relation to the piston 6. In the valve device 16 there is arranged a control hole 17 which coincides axially with the pressure pipe 14 and in which the pressure shaft 15 is movably arranged. The bottom of the control hole 17 communicates with the expansion chamber 10 so that the pressure shaft on one side is subjected to a pressure corresponding to the pressure in the expansion chamber 10 and on the other side is subjected to a pressure corresponding to the pressure in the measuring liquid chamber 13. The valve device 16 comprises a first liquid line 18 for removal of liquid from the space between the piston 6 and the separating piston 9 to the expansion chamber 10, and a second liquid line 19 for supplying liquid to the space between the piston 6 and the separating piston 9 from the expansion chamber 10. The first liquid line 18 comprises a first valve 20 and a first correspondingly, the second fluid line 19 comprises a second valve 22 and a second non-return valve 23. The valves 20, 22, and non-return valves 21, 23 are shown in greater detail in Fig. 2 and Fig. 3. The gas spring comprises a first bracket 34 in the first part 2 and a second bracket 35 in the piston rod 7.
    Fig. 2 shows on a larger magnification a part of the pressure control device in the gas spring 1 in a first position. The first valve 20 comprises a first valve seat 24 and a first ball 25 which is pressed against the first valve seat 24 with a spring 26. The second valve 22 correspondingly comprises a second valve seat 27, a second ball 28 which is pressed against the second valve seat 27. with a spring 29. The pressure shaft 15 comprises a first chamfer 30 facing the first valve 20 and a second chamfer 31 facing the second valve 22. Between the pressure shaft 15 and the first ball 25 there is arranged a first auxiliary ball 32 .
    Correspondingly, a second auxiliary ball 33 is arranged between the pressure shaft 15 and the second ball 28. In Fig. 2, the first bevel 30 is directed towards the first valve 20 and the first ball 25 rests against the first valve seat 24 so that the first valve 20 is closed. The second bevel 31 is not directed towards the second valve 22. Thus, the pressure shaft 15 pushes in the second auxiliary ball 33 which in turn pushes away the second ball 28 so that the second valve is kept open.
    Fig. 3 shows on a larger magnification a part of the pressure control device in the gas spring 1 in a second position. In the position shown in Fig. 3, the second bevel 31 is directed towards the second valve 22 so that it is kept closed. The pressure shaft 15 pushes in the first auxiliary ball 32 and via it the first ball 25 so that the first valve 20 is kept open.
    The function of the gas spring will now be described with reference to Figs. 1, 2 and 3. As the temperature of the gas spring rises, the volume of the measuring liquid will increase. The pressure shaft 15 will then be moved towards the piston 6 so that the first bevel 30 is no longer aligned with the first valve 20, as shown in Fig. 3. The second valve 20 will then open. The liquid will now be forced in from the space between the piston 6 and the separating piston 9 as long as the pressure in said space is higher than the gas pressure behind the measuring liquid piston 11. The first non-return valve 21 will ensure that liquid flow is only allowed in the direction towards the expansion chamber 10.
    When the temperature of the gas spring drops and the pressure in the cylinder 3 drops, the pressure shaft 15 will move in the direction away from the piston 6, so that the second chamfer 31 is no longer aligned with the second valve. The liquid will now be allowed to be expelled from the expansion chamber 10 as long as there is a higher pressure in the expansion chamber 10 than in the cylinder 3. The second non-return valve 23 will only allow liquid flow in the direction from the expansion chamber 10.
    The described embodiments can be varied in many ways without departing from the spirit and scope of the invention, which is limited only by the appended claims.
    The gas spring does not have to have a circular-cylindrical cylinder. It is of course possible within the scope of the invention to have other shapes on the cylinder such as an oval cylinder.
    It is not necessary to have the expansion chamber arranged in the piston rod.
    The expansion chamber can be arranged in a separate part outside the cylinder and the piston rod.
    It is possible to use other types of valves than those described above. Although in the above-described embodiment a liquid and a measuring liquid are referred to, it is primarily an oil and a measuring oil, respectively.
    权利要求:
    Claims (10)
    [1]
    Gas spring (1) comprising a first part (2) defining a cylinder (3), which comprises a longitudinal axis (4) and which is closed in a first end (5) along the longitudinal axis (4), a piston (6) which is movably arranged along the longitudinal axis (4) of the cylinder (3), a piston rod (7) which is connected to the piston (6) and which extends through the other end (8) of the cylinder, a separating piston (9) which is movably arranged along the longitudinal axis (4) of the cylinder (3) between the piston (6) and the first end (5), gas arranged in the cylinder (3) between the separating piston (9) and the first end (5), and liquid arranged between the separating piston (9) and the piston (6), characterized in that it also comprises an expansion chamber (10) for the liquid and a pressure regulating device which is arranged to control liquid transport between the cylinder (3) and the expansion chamber (10) depending on the temperature so as to keep the force characteristic of the gas spring (1) substantially independent of the temperature.
    [2]
    Gas spring (1) according to claim 1, wherein the pressure control device comprises a measuring fluid chamber (13), in which measuring fluid is arranged, and a pressure tube (14) in which a pressure shaft (15) is movably arranged, wherein the position of the pressure shaft (15) in the pressure pipe (14) depends on the volume of the measuring liquid and wherein the liquid transport between the cylinder (3) and the expansion chamber (10) is arranged to be controlled by the position of the pressure shaft (15).
    [3]
    Gas spring (1) according to claim 2, wherein the measuring liquid chamber (10) is arranged in the piston rod (7).
    [4]
    Gas spring (1) according to claim 3, wherein the piston rod (7) comprises a piston rod cylinder (12), wherein the measuring liquid chamber (13) is arranged in a measuring liquid piston (11) which is movably arranged in the piston rod cylinder (12).
    [5]
    Gas spring (1) according to claim 4, wherein the expansion chamber (10) is arranged between the measuring liquid piston (11) and the piston (6), the size of the expansion chamber (10) depending on the position of the measuring liquid piston (11) relative to the piston (6). 10 15 20 25
    [6]
    Gas spring (1) according to claim 3, 4 or 5, wherein the pressure control device comprises a valve device (16) which is fixedly arranged relative to the piston, which valve device comprises a control hole (17), which coincides axially with the pressure tube (14) and in which the pressure shaft is movably arranged.
    [7]
    Gas spring (1) according to claim 6, wherein the valve device (16) comprises a first liquid line (18) for removing liquid from the cylinder (3) to the expansion chamber (10), a first valve (20) arranged in the first liquid line (18) for controlling the flow of liquid through the first liquid line (18), a second liquid line (19) for supplying liquid to the cylinder (3) from the expansion chamber (10), and a second valve (22) arranged in the second liquid line (19) for controlling the flow of liquid through the second liquid line (19), the first valve (20) and the second valve (22) being controlled by the axial position of the pressure shaft (15) relative to the valve device (16).
    [8]
    Gas spring (1) according to claim 7, wherein at most one of the valves (20, 22) is open for each axial position of the pressure shaft (15).
    [9]
    A gas spring (1) according to claim 7 or 8, wherein each of the first valve (20) and the second valve (22) comprises a ball (25, 28), a valve seat (24, 27) and a spring ( 26, 29) which are arranged to press the ball (25, 28) against the valve seat (24, 27), the valves (20, 22) being arranged to be opened by pushing the balls away from the valve seats (24, 27), the pressure shaft ( 15) comprises chamfers (30, 31) for each of the valves (20, 22), the pressure shaft (15) and the valves (20, 22) being arranged so that each of the valves (20, 22) is closed when the associated chamfer (30, 31) is directed towards the valve (20, 22) and open when the chamfer (30, 31) is outside the valve (20, 22) and the pressure shaft (15) thus pushes away the associated ball (25, 28) from the valve seat.
    [10]
    Motor vehicle comprising a gas spring (1) according to any one of the preceding claims.
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    同族专利:
    公开号 | 公开日
    EP2539604A1|2013-01-02|
    WO2011105958A1|2011-09-01|
    US8678149B2|2014-03-25|
    US20130038004A1|2013-02-14|
    EP2539604B1|2019-07-31|
    EP2539604A4|2018-01-10|
    SE534662C2|2011-11-08|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1050171A|SE534662C2|2010-02-24|2010-02-24|Gas spring with power characteristics substantially independent of temperature and motor vehicles including such a gas spring|SE1050171A| SE534662C2|2010-02-24|2010-02-24|Gas spring with power characteristics substantially independent of temperature and motor vehicles including such a gas spring|
    EP11747795.0A| EP2539604B1|2010-02-24|2011-02-24|Gas spring with temperature compensation|
    PCT/SE2011/050209| WO2011105958A1|2010-02-24|2011-02-24|Gas spring with temperature compensation|
    US13/521,359| US8678149B2|2010-02-24|2011-02-24|Gas spring with temperature compensation|
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