WO2011147613A2 - Selbstpumpendes federbein - Google Patents
Selbstpumpendes federbein Download PDFInfo
- Publication number
- WO2011147613A2 WO2011147613A2 PCT/EP2011/055159 EP2011055159W WO2011147613A2 WO 2011147613 A2 WO2011147613 A2 WO 2011147613A2 EP 2011055159 W EP2011055159 W EP 2011055159W WO 2011147613 A2 WO2011147613 A2 WO 2011147613A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- piston rod
- space
- fluid
- working
- chamber
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
- B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
- B60G17/044—Self-pumping fluid springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
- B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
- B60G17/048—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics with the regulating means inside the fluid springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2500/00—Indexing codes relating to the regulated action or device
- B60G2500/30—Height or ground clearance
Definitions
- the invention relates to a self-inflating strut according to the preamble of patent claim 1.
- a self-pumping hydropneumatic strut with internal level control especially for motor vehicles, filled with an oil under the pressure of at least one arranged in a high pressure chamber and acting as a spring gas cushion working cylinder, which is divided by a piston supported by a hollow piston rod working in two working spaces, with a piston driven by the spring movements and oil from a low pressure chamber in the working chamber associated with the high pressure chamber piston pump which is provided with a high pressure chamber connecting the low pressure chamber first flow connection, wherein a further, axially spaced, the high pressure chamber connectable to the low pressure chamber second flow connection provided is that can be switched on or off via a valve is described in DE 10 2008 032 950 B3.
- the vehicle body of a motor vehicle can be adjusted to two different levels, so that a normal level for a slow speed and a lowered level for a fast ride can be set.
- oil is pumped from the low-pressure chamber into the high-pressure chamber until a bypass prevents the pumping work and thus adjusts the level.
- the position of the bypass and the discharge openings can be used to determine the maximum and minimum height of the vehicle body.
- the piston rod springs out, whereby the vacant discharge opening establishes a pressure equalization between the high and the low pressure chamber.
- the vehicle body then drops back to vacant heights.
- this known strut oil and a low pressure gas cushion are not separated from each other in the low pressure chamber. Accordingly, this strut can only be used in an installed position in which the axially movable Kobenstange protrudes upwards out of the working cylinder. Furthermore, an externally controllable valve is required to set different levels.
- the present invention seeks to propose a self-pumping strut with internal level control that requires no external level sensors for level adjustment and can be used in any mounting position.
- the invention is based on a self-pumping strut with internal level control, for example, for motor vehicles, with a fluid-filled, under the pressure of acting as a spring fluid working cylinder, in whose working space a hollow piston rod is sealed, into which a fixed to the working cylinder pump piston sealed protrudes, which promotes fluid in relative movements between the working cylinder and the piston rod fluid from the working space in a standing under higher fluid pressure than in the working chamber pressure chamber, and with flow connections between the pressure chamber and the working space for selectively setting a predetermined, dynamic, determined by the extension length of the piston rod levels.
- This strut is according to the invention characterized in that the Kobenstange for selectively cooperating the axially and circumferentially spaced flow connections by means of a rotating device is rotatable.
- the rotating device may be formed, for example, as a hydraulic, pneumatic or electric servomotor and be controlled via a selector switch to be operated by the driver directly or via a level control system. Additional level control valves are not required and the level set by rotating the piston rod is maintained during the ride regardless of the load on the vehicle.
- the strut according to the invention can contain gas as fluid alone and work with or without damping effect of the piston rod movement.
- At least two of the flow connections in the piston rod in the form of axially and circumferentially spaced holes with connection to the working space and at least one flow connection in the pump piston in the form of a bore with connection to the pressure chamber may be formed, which, depending on the rotational position the piston rod, communicate with each other and thereby determine a specifiable level.
- a plurality of axially and circumferentially spaced holes may be provided in the piston rod to adjust corresponding, different levels of height can.
- three axially and circumferentially spaced holes may be provided in the piston rod, one of which determines a high level, a normal level and a low level.
- the flow connection may be formed in the piston rod in the form of an axially and circumferentially extending groove with connection to the working space and a flow connection in the pump piston in the form of a bore with connection to the pressure chamber, whereby depending on the rotational position of the piston rod continuously variable levels can be adjusted.
- the working cylinder may be surrounded by a coaxial outer cylinder. An annular space formed thereby is then subdivided by means of a membrane or a separating piston into a pressure-gas-filled compensating space and a hydraulic fluid-filled compensating space.
- the hydraulic fluid-filled Au Dermatraum is connected via openings in the working cylinder with the hydraulic fluid-filled working space.
- the pressure chamber consists of a hydraulic fluid-filled, connected to channels or spaces in the pump piston fluid space and one of them separated by a separating piston or a membrane high pressure gas space.
- the compressed gas in the high-pressure gas chamber acts indirectly on the hydraulic piston on the piston rod, as well as the compressed gas in the expansion chamber, which is ensured by the separation of the compressed gas filled spaces of the hydraulic fluid filled spaces by means of membranes or separating piston, that the strut according to the invention in any mounting position in the motor vehicle can be installed.
- the pump piston can be produced in a simple manner from two coaxial, attached to a common intermediate wall of the working and outer cylinder tubes whose annular space is connected via passages in the intermediate wall with the fluid space, connected via the bore with the flow connections and closed at the free end while its central interior communicates with the fluid space and a pump space in the piston rod via a pressure valve opening to the fluid space.
- the annular space between the outer and the inner tube may be suitably closed, for example by the outer tube is crimped inwardly at its free end, while the coaxial inner tube is flanged at its free end to the outside, and a sealing ring through these beadings is kept sealing.
- the beads may also touch and sealingly connected together by an annular weld.
- the piston rod Since the piston rod transmits the spring forces and possibly also the damping forces to the vehicle body, it must be strong and rigid. Accordingly, the wall thickness of the piston rod is so large that can be arranged in the wall of the piston rod communicating with the working space and the pump chamber via a suction valve opening to the pump chamber suction line.
- the shock absorber according to the invention can be provided in a simple manner with a shock absorber function if the working space is divided into two spaces by a piston which is fastened to the piston rod and has controllable flow openings.
- hydraulic fluid is displaced from one side of the piston to the other side of the piston, which can be adjusted by the controllable flow openings in the piston, a different damping effect during compression and rebound.
- Fig. 1 is a schematic sectional view of an inventive
- FIG. 2 is an enlarged detail view corresponding to detail detail A in Figure 1 showing the flow connections in the piston rod and the pump piston,
- Fig. 3 is a schematic sectional view of a piston rod with flow connections according to a second embodiment
- Fig. 4 is an enlarged detail of the seal of the free end of the pump piston.
- An outer cylinder 24 of the strut according to the invention is fixed in a manner not shown, known manner on a vehicle body, not shown.
- a piston rod 1 is connected in a manner not shown, known manner with an axis, not shown, of the vehicle.
- the piston rod 1 is sealed by a cover 20 in a working space of a working cylinder 19, which is divided by a fixed to the piston rod 1 piston 7 in a lower working space 3 and an upper working space 31.
- check valves 30 are arranged, which cause a different damping of the hydraulic fluid flow from the lower working chamber 3 in the upper working chamber 31 and vice versa, when the piston rod 1 moves inwardly and outwardly with the working piston 7 while driving.
- a pump chamber 2 of the piston rod 1 protrudes from an outer tube 4 and an inner tube 6 formed pump piston which is sealingly fitted into the piston rod 1.
- a formed between the outer tube 4 and the inner tube 6 annular space 14 is closed at the free end to the pump chamber 2 out through a ring plate and connected to a filled with hydraulic fluid space 8 via passages 26 in an intermediate wall 27.
- a central inner space 25 in the inner tube 6 is open towards the pump chamber 2 and can be connected to the fluid space 8 via a pressure valve 9 arranged in the intermediate wall 27.
- a high-pressure gas space 1 1 is separated from the fluid space 8 in a known manner by a displaceable separating piston 10 and closed by an end wall 12.
- the fluid space 8, the separating piston 10 and the high-pressure gas space 1 1 form a high-pressure chamber 13, which is arranged in an outer cylinder 24 coaxially surrounding the working piston 19.
- the aforementioned intermediate wall 27 separates the fluid space 8 from the upper working chamber 31 and a hydraulic fluid-filled compensation chamber 29 between the working cylinder 19 and the outer cylinder 24.
- a gas-filled compensation chamber 1 6 in the annular space between the working cylinder 19 and the outer cylinder 24 is from the hydraulic fluid-filled compensation chamber 29 by a Membrane 15 separated.
- the separation between the gas-filled and the hydraulic fluid-filled compensation chambers can be done as well as in the pressure chamber 13 by a separating piston, while the separating piston 10 may be replaced in the pressure chamber 13 by a membrane.
- the hydraulic fluid-filled compensation chamber 29 communicates with the lower working chamber 3 via openings 23 in the working cylinder 19 in constant communication.
- a suction line 22 is arranged, which extends in the wall of the piston rod 1 and is provided with a suction valve 21 opening to the pump chamber 2. Furthermore, in the piston rod 1 axially and circumferentially spaced leveling holes 5 and 18 are provided, of which the level 5 a lower level adjustment of the vehicle and the level 18, an upper level adjustment of the vehicle in conjunction with a arranged in the outer tube 4 of the pump piston Aufregelbohrung 17th determine.
- the piston rod 1 is rotated by 180 ° by means of a rotating device 33, not shown in detail.
- the rotating device 33 can in the simplest case a hand-operated handle on the piston rod 1 exist.
- the rotary device 33 is a servomotor, which can be controlled via a level control system 34.
- a switch for two or more level heights or a knob for continuously setting different levels heights can then be to set the desired level, a switch for two or more level heights or a knob for continuously setting different levels heights.
- the piston rod 1 is rotated by means of the rotating device 33 by 180 ° to reach the low level.
- the Aufregelbohrung 17 in the outer tube 4 of the pump piston and the upper leveling 18 then no longer come to cover.
- the relative movement between the piston rod 1 and the working cylinder 19 while driving hydraulic fluid from the working chambers 3, 31 is sucked in via the suction line 22 and the suction valve 21 and conveyed via the pressure valve 9 into the pressure chamber 13.
- the pressure in the work chambers 3, 31 and thus the piston rod extension force decreases.
- the vehicle body moves as a result in the direction of low level until the lower level 5 and the Aufregelbohrung 17 come to cover and release a connection between the pressure chamber 13 and the working spaces 3, 31.
- the hydraulic fluid flowing into the working spaces 3, 31 in this position prevents a further drop in the vehicle body, and the low level reached is also maintained, as already described with regard to the high level.
- the sinking of the vehicle when loading leads to an overlap of the lower level 5 and the Aufregelbohrung 17, so that hydraulic fluid from the pressure chamber 13 into the working spaces 3, 31 can flow, which increases the pressure in the working spaces 3, 31 and thus the piston rod extension force, so that the vehicle body is raised until the set low level is reached again.
- the embodiment according to FIG. 3 shows, in addition to the lower leveling bore 5 and the upper leveling bore 18, an aligning groove 32 which makes it possible to raise the vehicle body from the low level.
- the Aufregelnut 32 penetrates the wall of the piston rod 1 radially preferably completely in the direction of the working space. 3
- the Aufregelnut 32 extends, as shown in Fig. 3, at its beginning and end with a slight slope and therebetween with a constant pitch, so that when turning the piston rod 1 hydraulic fluid from the pressure chamber 13 in the working chambers 3, 31 can flow, there the Increases pressure and lifts the vehicle body.
- the Aufregelnut 32 has therefore for gentle Aufregeln at their ends lower slopes and begins below the lower level 5 and ends above the upper leveling hole 18. If the piston rod 1, starting from the low level, rotated by 180 °, the vehicle body moves in a level above the high level. If the vehicle is parked in this position, it remains in this level position above the high level, which facilitates the entry and exit. After a certain distance, the vehicle body reaches the set, slightly lower high level due to the pumping movements.
- the vehicle body occupies a level position in the middle between the high level and the low level. It can be seen that by a rotation from 0 to 180 ° a continuous adjustment of intermediate positions between the high level and the low level is possible.
- Fig. 4 is an enlarged view of the sealing of the ends of the outer tube 4 with respect to the inner tube 6. While in Fig. 1 a sealing is achieved by a welded to the tube ends ring plate, Fig. 4 shows a simple seal without weld: The äuße- re pipe 4 is crimped inwardly at the lower end, while the inner tube 6 is crimped at the lower end to the outside. As a result, the annular space 14 is almost closed, and it can be a sealing ring 28 which almost fills the annular space 14, use, which is pressed by the pressure in the pressure chamber 13 sealingly against the flanges.
- the pump piston may also be solid and then has a central through-bore between the pressure valve 9 and the pump chamber 2 and a reaching to Aufregelbohrung 17 desaxêt bore.
- hydropneumatic struts Compared with the known self-pumping, hydropneumatic struts a very quick Aufregeln in the high level and a level control for load balance is given. No additional level sensors are required. Depending on the angular position of the piston rod, any level positions can be set continuously between an upper and a lower limit position, and an additional load is compensated even in the state in all level positions.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2011800260592A CN102905915A (zh) | 2010-05-27 | 2011-04-04 | 自动泵吸式悬架支柱 |
US13/641,711 US8840094B2 (en) | 2010-05-27 | 2011-04-04 | Self-pumping suspension strut |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010029387.3 | 2010-05-27 | ||
DE102010029387A DE102010029387A1 (de) | 2010-08-28 | 2010-08-28 | Selbstpumpendes Federbein |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2011147613A2 true WO2011147613A2 (de) | 2011-12-01 |
WO2011147613A3 WO2011147613A3 (de) | 2012-02-16 |
Family
ID=44625725
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2011/055159 WO2011147613A2 (de) | 2010-05-27 | 2011-04-04 | Selbstpumpendes federbein |
Country Status (4)
Country | Link |
---|---|
US (1) | US8840094B2 (de) |
CN (1) | CN102905915A (de) |
DE (1) | DE102010029387A1 (de) |
WO (1) | WO2011147613A2 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8844943B2 (en) * | 2012-12-17 | 2014-09-30 | Hyundai Motor Company | Electronic control suspension system for vehicles |
US9915313B2 (en) * | 2014-05-12 | 2018-03-13 | Cane Creek Cycling Components | Twin tube damper |
IT201900015042A1 (it) * | 2019-08-26 | 2021-02-26 | Ultraflex Spa | Dispositivo di sterzatura idraulico per imbarcazioni, natanti o simili |
CN113108005B (zh) * | 2020-01-09 | 2022-07-26 | 广州汽车集团股份有限公司 | 一种减振器总成 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008032950B3 (de) | 2008-07-12 | 2010-02-18 | Zf Friedrichshafen Ag | Selbstpumpendes hydropneumatisches Federbein |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2814482A (en) * | 1954-06-15 | 1957-11-26 | Boeing Co | Aircraft landing gear shock strut |
US2879057A (en) * | 1956-05-21 | 1959-03-24 | Thompson Prod Inc | Adjustable self-pumping leveling system |
US3194547A (en) * | 1961-04-28 | 1965-07-13 | Avner David Alan | Hydro-pneumatic vehicle suspension unit |
GB2101266B (en) * | 1981-07-09 | 1985-08-21 | Lucas Industries Ltd | Self-pumping struts for vehicle suspension systems |
JP2703899B2 (ja) | 1987-03-16 | 1998-01-26 | 日本発条株式会社 | シリンダピストン装置 |
DE19547536C2 (de) * | 1995-12-20 | 1999-12-09 | Mannesmann Sachs Ag | Selbstpumpendes hydropneumatisches Federbein mit innerer Niveauregulierung |
JPH09310731A (ja) * | 1996-05-21 | 1997-12-02 | Tokico Ltd | 油圧緩衝器 |
JP2001180244A (ja) * | 1999-12-27 | 2001-07-03 | Nissan Motor Co Ltd | 車両の姿勢制御装置 |
DE10221833B4 (de) * | 2002-05-16 | 2006-03-09 | Zf Sachs Ag | Selbstpumpendes hydropneumatisches Federbein |
US6708803B2 (en) * | 2002-06-10 | 2004-03-23 | Mark Andrew Jensen | Self-leveling dual spring rate strut |
JP4839196B2 (ja) * | 2006-03-28 | 2011-12-21 | カヤバ工業株式会社 | 車高調整装置 |
-
2010
- 2010-08-28 DE DE102010029387A patent/DE102010029387A1/de not_active Withdrawn
-
2011
- 2011-04-04 US US13/641,711 patent/US8840094B2/en not_active Expired - Fee Related
- 2011-04-04 WO PCT/EP2011/055159 patent/WO2011147613A2/de active Application Filing
- 2011-04-04 CN CN2011800260592A patent/CN102905915A/zh active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008032950B3 (de) | 2008-07-12 | 2010-02-18 | Zf Friedrichshafen Ag | Selbstpumpendes hydropneumatisches Federbein |
Also Published As
Publication number | Publication date |
---|---|
CN102905915A (zh) | 2013-01-30 |
DE102010029387A1 (de) | 2012-03-01 |
WO2011147613A3 (de) | 2012-02-16 |
US8840094B2 (en) | 2014-09-23 |
US20130049310A1 (en) | 2013-02-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP3113964B1 (de) | Schwingungsdämpfer mit niveauregulierung | |
DE102007036102B4 (de) | Selbstpumpende hydropneumatische Feder-Dämpfer-Einheit | |
EP2085638B1 (de) | Gasdruckstoßdämpfer | |
DE102006026625B4 (de) | Vorrichtung zur Höhenverstellung des Aufbaus von Kraftfahrzeugen | |
DE102004032083B4 (de) | Feder- und Dämpfungsvorrichtung für Radaufhängungen | |
DE202005009909U1 (de) | Federsystem | |
WO2017081090A1 (de) | Kraftfahrzeug-fahrgestell | |
DE19857595C2 (de) | Selbstpumpendes hydropneumatisches Federbein mit innerer Niveauregelung | |
WO2020001962A1 (de) | FAHRZEUG-RADAUFHÄNGUNG MIT EINEM VERSTELLSYSTEM FÜR DEN FUßPUNKT EINER AUFBAU-TRAGFEDER | |
DE19704189C2 (de) | Selbstpumpendes hydropneumatisches Federbein mit innerer Niveauregelung | |
DE102013206122B4 (de) | Vorrichtung zur Höhenverstellung eines Fahrzeugaufbaus | |
WO2011147613A2 (de) | Selbstpumpendes federbein | |
DE10306564B3 (de) | Dämpfer | |
DE102011121777B4 (de) | Doppeltwirkender Hydraulikzylinder mit integrierten Kolbenspeichern | |
EP3840966B1 (de) | Höhenverstellbares feder-dämpfersystem für ein fahrzeug | |
DE3223263C2 (de) | Einrichtung zur Niveauregelung eines Kraftfahrzeuges | |
DE2411797C3 (de) | Hydropneumatisches Federbein mit innerer Niveauregelung zum Anschluß an eine außen liegende Druckflüssigkeitsquelle für Fahrzeuge | |
DE2723305A1 (de) | Verriegelbare hydropneumatische federung, insbesondere fuer die vorderachse von radladern o.dgl. | |
DE102006027388B4 (de) | Federsystem | |
DE102018217372B3 (de) | Dämpfervorrichtung sowie Fahrzeug mit der Dämpfervorrichtung | |
EP3329142B1 (de) | Hydraulischer einrohr-teleskop-schwingungsdämpfer | |
DE102019116352A1 (de) | Fahrlagenverstellung und Beladungsausgleich | |
DE202007003861U1 (de) | Hubdüse, insbesondere in einer Scheinwerferreinigungsanlage | |
DE3309042A1 (de) | Hydropneumatischer einrohr-teleskopstossdaempfer fuer kraftfahrzeuge | |
DE102018217371B3 (de) | Dämpfervorrichtung sowie Fahrzeug mit der Dämpfervorrichtung |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201180026059.2 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 11712835 Country of ref document: EP Kind code of ref document: A2 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13641711 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10680/CHENP/2012 Country of ref document: IN |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 11712835 Country of ref document: EP Kind code of ref document: A2 |