EP1467118A2 - Dispositif de réalimentation des chambres d'un vérin hydraulique - Google Patents
Dispositif de réalimentation des chambres d'un vérin hydraulique Download PDFInfo
- Publication number
- EP1467118A2 EP1467118A2 EP04290911A EP04290911A EP1467118A2 EP 1467118 A2 EP1467118 A2 EP 1467118A2 EP 04290911 A EP04290911 A EP 04290911A EP 04290911 A EP04290911 A EP 04290911A EP 1467118 A2 EP1467118 A2 EP 1467118A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- valves
- spring
- valve
- valve seat
- chambers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/047—Preventing foaming, churning or cavitation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/2496—Self-proportioning or correlating systems
- Y10T137/2559—Self-controlled branched flow systems
- Y10T137/265—Plural outflows
- Y10T137/2663—Pressure responsive
Definitions
- the invention relates to a device for regulating the pressure. in the chambers of a hydraulic cylinder, especially when the cylinder hydraulic is used as a shock absorber.
- the invention relates more particularly to a device for hydraulic fluid replenishment of the chambers of a hydraulic cylinder used as a shock absorber.
- the cylinder is used by example as a steering actuator of an aircraft and is able to be used to ensure depreciation whether in normal operation or in emergency mode.
- FIG. 1 schematically illustrates a conventional device for pressure regulation in the chambers of a hydraulic cylinder 1 used as a shock absorber.
- Said hydraulic cylinder 1 comprises a chamber 14 filled with hydraulic fluid in which a piston 13 and a control rod 11 integral with said piston 13.
- the position of the piston 13 in the chamber 14 defines on either side of the said piston 13 two chambers, Chamber1 and Chamber2, respectively to the left and to the right of said piston 13.
- the hydraulic cylinder 1 receives by its control rod 11 a reciprocating movement represented by arrow 12, said hydraulic cylinder 1 having the function of damping said reciprocating movement.
- the fluid hydraulics pass from one chamber to the other through a restrictor 3.
- each of the chambers Room1, Room2 is conventionally connected to a device 2 allowing to replenish said cylinder 1 with hydraulic fluid.
- a hydraulic accumulator 4 pressurizes the hydraulic fluid above of atmospheric pressure.
- the pressurized fluid circulates from said physical accumulator 4 to the device 2.
- Said device 2 has thus for the function of supplying pressurized hydraulic fluid, when this is necessary, room Room1 or Room2 in depression.
- said device 2 is of the "non-return" type, the fluid can only circulate from said device 2 to said chambers Bedroom 1, Bedroom 2 of said cylinder 1.
- the device 2 for re-supplying fluid to the chambers of a jack hydraulic like the one schematically illustrated in Figure 1, includes conventionally two check valves. Said two non-return valves are arranged separately or placed head to tail in the same bore. And each check valve thus has its own spring and its own valve guide.
- such a device for re-supplying fluid to rooms of a hydraulic cylinder is bulky and the number of parts necessary for its realization is important.
- the size and complexity of such a device are in particular such as in particular the volume, mass and cost of producing such a device are high.
- An object of the invention is to overcome these aforementioned drawbacks.
- the invention proposes a device for regulating the pressure in the chambers of a hydraulic cylinder comprising a seat hollow valve extending substantially longitudinally between two portions end, the body of the valve seat being connected to a source of pressurized fluid, each of the end portions of the valve seat being connected to a chamber of the hydraulic cylinder and adapted to accommodate a valve to control the hydraulic fluid replenishment of said cylinder chamber, characterized in that a valve return spring is arranged in said valve seat and in that each of the ends of said valve return spring is hooked to one of said valves.
- the device which is the subject of the invention requires only one spring.
- the mobile equipment consisting of the spring and the valves has no need to be guided. Due to the restoring force exerted by said spring, the valves effectively return automatically, after their lifted, on the end portions of the valve seat.
- the device object of the invention therefore does not make use of valve guides. The size of the device object of the invention is thus limited and its implementation is simplified.
- the object of the invention also prevents the circulation of hydraulic fluid from said cylinder chambers to said seat valve, said valves thus also acting as non-return valves.
- each of the valves from its equilibrium position in contact with the corresponding end portion of the valve seat is produced as soon as a sufficient pressure difference exists between the chamber of the hydraulic cylinder to which said portion end of said valve seat is connected and the interior of said valve seat, thereby authorizing the replenishment of pressurized hydraulic fluid from said cylinder chamber.
- each of the ends of the spring of valve reminder is attached to one of the valves substantially in its center suitably so that the mobile equipment consisting of the spring and valves need not be guided, said valves returning in particular automatically on their equilibrium position after being removed from it, including understood if the said valves have not moved perfectly in the axis of the seat valve.
- valves used in the context of the invention are spherical or conical in scope.
- a through hole each of the valves and each of the end portions of the spring forms a end wire capable of coming into said holes.
- Said sons end protrude from the holes and are welded at their outlet to said valves to allow the attachment of each end of said spring to a of said valves.
- an adjustment of the spring tension is once a first end portion of the spring is welded to a first valve, by stretching the other end portion of the spring through the hole diametrically crossing the second valve until the setting under desired tension. The other end portion of said spring is then welded audit second valve.
- the valves have a stud pierced with a hole and each of the end portions of the valve return spring forms an end loop. Said loops end are received in said nipple holes to allow the attachment of each end of said valve return spring to one of said valves.
- said valves cannot be simultaneously spaced from said end portions of said valve seat, this which prevents the simultaneous supply of the chambers of said cylinder.
- the device 2 object of the invention for the fluid supply of the chambers of a jack hydraulic comprises a valve seat 5 which receives the fluid supply of the hydraulic accumulator to which it is connected via conduit 18.
- Said valve seat 5 is substantially cylindrical and is filled with hydraulic fluid previously pressurized by the hydraulic accumulator.
- Said valve seat 5 has at each of its ends a seat of valve capable of accommodating a valve 7a, 7b and will therefore be called subsequently double-seat valve.
- valves 7a, 7b preferably have a spherical bearing or conical so as to come into effective contact with each of the portions end of the double-seat valve 5 for sealing the device subject of the invention.
- Each end of the double valve seat 5 is connected to one of rooms Room1, Room2 of the hydraulic cylinder used as shock absorber allowing, when necessary, the re-supply of hydraulic fluid from one of the chambers Chamber1, Chamber2 of the cylinder hydraulic.
- a tension spring 6 is arranged in the center of said double seat 5 of valve and the valves 7a, 7b are hooked respectively to each of the ends of said tension spring 6.
- valves 7a, 7b are drawn in their center by each of the ends of said tension spring 6.
- said two valves 7a, 7b connected together by said tension spring 6 are, in their equilibrium position, housed in their seats respective on either side of said double seat 5 of valve filled with fluid pressurized.
- the restoring force exerted by the spring 6 on each of the valves 7a, 7b substantially in their center allows to maintain said valves 7a, 7b in contact with said double-seat valve 5 and prevent the flow of said fluid towards one of the chambers.
- the tension spring 6 advantageously constitutes a spring of valve reminder. After being removed from their equilibrium position, said valves 7a, 7b effectively return automatically, due to the force of return exerted by said spring 6, in equilibrium position, to be housed in their respective seats, including if the said valves have not moved aside perfectly in line with said double valve seat 5. Mobile equipment consisting of the spring 6 and said valves 7a, 7b has thus, by construction, no need to be guided.
- valves 7a, 7b cannot be simultaneously removed from their equilibrium position in contact with the double seat 5 of valve.
- the simultaneous supply of the two rooms Bedroom 1,rade2 cannot therefore operate and a faulty operation of the pressure regulation device in the cylinder chambers hydraulic is thus prevented.
- the arrangement of the parts of the device which is the subject of the invention advantageously creates a testable set outside of its final assembly in the device for which it is intended.
- valves 7a, 7b are not only valves of make-up capable of allowing the circulation of fluid from said double seat 5 valve to the cylinder chambers but also valves non-return capable of preventing the circulation of fluid from said chambers of the jack towards said double-seat valve 5.
- FIG. 3 shows a first embodiment of the attachment from the tension spring 6 to the valves 16a, 16b.
- Each of said valves 16a, 16b respectively comprises a stud 14a, 14b which extends towards the inside of the double valve seat 5.
- Each of the pins 14a, 14b is respectively pierced with a hole 15a, 15b able to receive an end portion of the spring 6 forming a loop end.
- said spring 6 is able to extend enough to, once the first end portion forms a loop received in the nipple hole of a valve (for example the loop left end of the spring 6 received in the hole 15a of the stud 14a of the valve 16a), allow the assembly of the second end portion forming a loop (the right end loop in this example) with the other valve (here valve 16b) and therefore the constitution of the mobile equipment consisting of said spring 6 and said valves 16a, 16b in said seat valve 5.
- Figure 4 shows more precisely a sectional view of a device according to the invention for which the attachment of the spring 6 of pulling the valves 16a, 16b is carried out in accordance with the first mode of embodiment illustrated in Figure 3.
- References 19 and 20 represent the communication of each of the end portions of the double seat 5 of valve to one of the hydraulic cylinder chambers, said communication of course only authorized when the corresponding valve is removed from its equilibrium position.
- FIG. 5 shows a second embodiment of the attachment from the tension spring 6 to the valves 17a, 17b.
- Each of the valves 17a, 17b is a ball pierced with a hole through its diameter. Said holes extend longitudinally in extension of the longitudinal axis of said double seat 5 valve and are adapted to receive an end portion of the spring 6 forming an end wire.
- said end portions of the spring 6 forming an end wire protrude from the balls forming valves 17a, 17b and are welded at their outlet from said balls forming valves 17a, 17b at the points referenced 8 and 9 in FIG. 5.
- the sub-assembly formed by the valves 17a, 17b and of the tension spring 6 is thus removable.
- an adjustment of the tension of the spring 6 can be advantageously performed.
- a first weld is all first performed (welding 8 for example) on a first portion end of the spring. Once this first weld is completed, the other end portion of the spring is stretched, while keeping the valve on the side of this other end portion of the spring in contact with the double seat 5 of valve (valve 17a in the example), until reaching the setting under desired spring tension.
- the spring tension adjustment is schematically represented in FIG. 5 by the arrow 10.
- the second solder solder 9 in this example
- the stretching of the end portion forming the end wire of the spring 6 through the hole in the valve for adjusting the tension of the spring advantageously makes it possible to ensure adjustment of the valve calibration particularly precise.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Damping Devices (AREA)
- Safety Valves (AREA)
- Actuator (AREA)
Abstract
Description
- la figure 1, déjà commentée, représente schématiquement un dispositif de régulation de la pression dans les chambres d'un vérin hydraulique utilisé comme amortisseur ;
- la figure 2 représente schématiquement le dispositif pour la réalimentation en fluide des chambres d'un vérin hydraulique objet de l'invention ;
- la figure 3 illustre un premier mode de réalisation de l'accrochage du ressort de traction aux clapets à portée sphérique ;
- La figure 4 représente une vue en coupe d'un dispositif conforme à l'invention, l'accrochage du ressort de traction aux clapets étant réalisé conformément au premier mode de réalisation illustré sur la figure 3 ;
- la figure 5 illustre un second mode de réalisation de l'accrochage du ressort de traction aux clapets à portée sphérique.
Claims (9)
- Dispositif de régulation de la pression dans les chambres d'un vérin hydraulique comportant un siège (5) de clapet creux s'étendant sensiblement longitudinalement entre deux portions d'extrémité, le corps du siège (5) de clapet étant connecté à une source de fluide pressurisé (18), chacune des portions d'extrémités du siège (5) de clapet étant reliée à une chambre dudit vérin hydraulique et adaptée pour accueillir un clapet (7a, 7b) permettant de contrôler la réalimentation en fluide hydraulique de la chambre du vérin, caractérisé en ce qu'un ressort (6) de rappel de clapet est disposé dans ledit siège (5) de clapet et en ce que chacune des extrémités dudit ressort (6) de rappel de clapet est accrochée à un desdits clapets (7a, 7b).
- Dispositif selon la revendication 1, caractérisé en ce qu'il empêche en outre la circulation de fluide hydraulique depuis lesdites chambres du vérin vers ledit siège (5) de clapet, lesdits clapets (7a, 7b) faisant ainsi également office de clapets anti-retour.
- Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'un des clapets (7a, 7b) est écarté de sa position d'équilibre au contact de la portion d'extrémité correspondante dudit siège (5) de clapet dès lors qu'une différence de pression suffisante existe entre la chambre du vérin hydraulique à laquelle ladite portion d'extrémité dudit siège (5) de clapet est reliée et l'intérieur dudit siège (5) de clapet, autorisant de la sorte la réalimentation en fluide pressurisé de ladite chambre du vérin.
- Dispositif selon l'une des revendications précédentes, caractérisé en ce que chacune des extrémités du ressort (6) de rappel de clapet est accrochée à un des clapets (7a, 7b) sensiblement en son centre de manière adaptée pour que l'équipement mobile constitué dudit ressort (6) et desdits clapets (7a, 7b) n'ait pas besoin d'être guidé.
- Dispositif selon l'une des revendications précédentes, caractérisé en ce que les clapets (7a, 7b) sont de portée sphérique ou conique.
- Dispositif selon l'une des revendications précédentes, caractérisé en ce que, un trou traversant chacun des clapets (17a, 17b) et chacune des portions d'extrémité dudit ressort (6) formant un fil d'extrémité apte à venir s'introduire dans lesdits trous, lesdites portions d'extrémité formant fil dépassent desdits trous et sont soudés à leur sortie desdits trous auxdits clapets (17a, 17b) pour permettre l'accrochage de chacune des extrémités dudit ressort (6) à un desdits clapets (17a, 17b).
- Dispositif selon la revendication 6, caractérisé en ce qu'un réglage de la tension du ressort (6) est réalisé, une fois une première portion d'extrémité dudit ressort (6) formant fil d'extrémité soudée à un premier clapet, en étirant l'autre portion d'extrémité dudit ressort (6) à travers le trou traversant diamétralement le second clapet jusqu'à obtenir la mise sous tension désirée, ladite autre portion d'extrémité dudit ressort (6) étant alors soudée audit second clapet.
- Dispositif selon l'une des revendications 1 à 5, caractérisé en ce que, les clapets (16a, 16b) comportant un téton (14a, 14b) percé d'un trou (15a, 15b) et chacune desdites portions d'extrémité dudit ressort (6) formant une boucle d'extrémité, lesdites boucles d'extrémité sont reçues dans les trous (15a, 15b) desdits tétons (14a, 14b) pour permettre l'accrochage de chacune des extrémités dudit ressort (6) à un desdits clapets (16a, 16b).
- Dispositif selon l'une des revendications précédentes, caractérisé en ce que lesdits clapets (7a, 7b) ne peuvent être simultanément écartés desdites portions d'extrémité dudit siège de clapet (5), l'alimentation simultanée desdites chambres dudit vérin étant ainsi prévenue.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0304385 | 2003-04-09 | ||
| FR0304385A FR2853708B1 (fr) | 2003-04-09 | 2003-04-09 | Dispositif de realimentation des chambres d'un verin hydraulique |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1467118A2 true EP1467118A2 (fr) | 2004-10-13 |
| EP1467118A3 EP1467118A3 (fr) | 2004-11-03 |
| EP1467118B1 EP1467118B1 (fr) | 2005-11-16 |
Family
ID=32865400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20040290911 Expired - Lifetime EP1467118B1 (fr) | 2003-04-09 | 2004-04-06 | Dispositif de réalimentation des chambres d'un vérin hydraulique |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7007588B2 (fr) |
| EP (1) | EP1467118B1 (fr) |
| DE (1) | DE602004000184T2 (fr) |
| ES (1) | ES2248786T3 (fr) |
| FR (1) | FR2853708B1 (fr) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007020052A1 (fr) * | 2005-08-16 | 2007-02-22 | Trw Automotive Gmbh | Actionneur hydraulique, destine notamment a un systeme de stabilisation de chassis, et circuit hydraulique comportant un tel actionneur |
| US7377372B2 (en) | 2004-12-06 | 2008-05-27 | öHLINS RACING AB | Telescopic fork leg |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8327983D0 (en) * | 1983-10-19 | 1983-11-23 | Pipe Supports Ltd | Shock arrestors |
| US6390254B1 (en) * | 1997-07-10 | 2002-05-21 | Honeywell International Inc. | Constant volume damper |
| JPH1163081A (ja) * | 1997-08-27 | 1999-03-05 | Sanwa Tekki Corp | 振動数感応型油圧制振装置 |
-
2003
- 2003-04-09 FR FR0304385A patent/FR2853708B1/fr not_active Expired - Lifetime
-
2004
- 2004-04-06 EP EP20040290911 patent/EP1467118B1/fr not_active Expired - Lifetime
- 2004-04-06 ES ES04290911T patent/ES2248786T3/es not_active Expired - Lifetime
- 2004-04-06 DE DE200460000184 patent/DE602004000184T2/de not_active Expired - Lifetime
- 2004-04-07 US US10/820,572 patent/US7007588B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7377372B2 (en) | 2004-12-06 | 2008-05-27 | öHLINS RACING AB | Telescopic fork leg |
| WO2007020052A1 (fr) * | 2005-08-16 | 2007-02-22 | Trw Automotive Gmbh | Actionneur hydraulique, destine notamment a un systeme de stabilisation de chassis, et circuit hydraulique comportant un tel actionneur |
Also Published As
| Publication number | Publication date |
|---|---|
| DE602004000184D1 (de) | 2005-12-22 |
| FR2853708B1 (fr) | 2005-05-27 |
| DE602004000184T2 (de) | 2006-06-29 |
| EP1467118A3 (fr) | 2004-11-03 |
| US7007588B2 (en) | 2006-03-07 |
| US20040255772A1 (en) | 2004-12-23 |
| FR2853708A1 (fr) | 2004-10-15 |
| ES2248786T3 (es) | 2006-03-16 |
| EP1467118B1 (fr) | 2005-11-16 |
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