FR2526903A1 - Hydro-pneumatic vehicle suspension - has tubular membrane within piston subjected to radial pressure to give progressive damping - Google Patents

Hydro-pneumatic vehicle suspension - has tubular membrane within piston subjected to radial pressure to give progressive damping Download PDF

Info

Publication number
FR2526903A1
FR2526903A1 FR8208537A FR8208537A FR2526903A1 FR 2526903 A1 FR2526903 A1 FR 2526903A1 FR 8208537 A FR8208537 A FR 8208537A FR 8208537 A FR8208537 A FR 8208537A FR 2526903 A1 FR2526903 A1 FR 2526903A1
Authority
FR
France
Prior art keywords
membrane
suspension according
fluid
wall
gas
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
Application number
FR8208537A
Other languages
French (fr)
Other versions
FR2526903B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9274088&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=FR2526903(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Priority to FR8208537A priority Critical patent/FR2526903B1/en
Publication of FR2526903A1 publication Critical patent/FR2526903A1/en
Application granted granted Critical
Publication of FR2526903B1 publication Critical patent/FR2526903B1/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
    • F16F9/08—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid where gas is in a chamber with a flexible wall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
    • B60G15/08—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having fluid spring
    • B60G15/12—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having fluid spring and fluid damper

Abstract

The suspension unit has a piston (1) sliding axially in a cylindrical casing (2) through an annular seal. A tubular membrane (3) is fitted inside the piston and sealed at both ends. The unit has gas on the outside of the membrane and fluid on the inside. As the piston moves, fluid passes through the orifice in the plug (4) and causes the membrane to expand. The principle of operation follows the law that pressure times volume is always constant and therefore a differential rating is obtained during the travel of the piston.

Description

La présente invention concerne les suspensions du type oléopneumatique, c'est-a-dire qu'on exploite la différence de compressibilité qu'il existe entre un fluide et un gaz pour absorber les inerties dûes à des masses en mouvement. The present invention relates to suspensions of the oleopneumatic type, that is to say that the difference in compressibility that exists between a fluid and a gas is used to absorb the inertias due to moving masses.

Dans les suspensions connues de ce genre, on peut distinguer plusieurs procédés permettant de séparer la partie hydraulique de la partie gazeuse
Dans un premier cas on utilise un piston, équipe de joints, pouvant se déplacer dans l'alésage d'un piston plongeur, la partie hydraulique par l'intermediaire de ce piston se trouve ainsi isolée de la partie gazeuse.In known suspensions of this kind, one can distinguish several methods allowing the hydraulic part to be separated from the gas part.
In a first case, a piston is used, fitted with seals, which can move in the bore of a plunger, the hydraulic part by means of this piston is thus isolated from the gaseous part.

Ce procédé a hélas l'inconvénient de ne pas assurer une étanchéité dynamique optimum car il apparat t toujours des fuites dûes à des défauts de géométrie des usinages.Unfortunately, this process has the disadvantage of not ensuring optimum dynamic sealing since there always appears to be leaks due to defects in the geometry of the machining operations.

Dans un deuxième cas, on utilise pour la séparation du gaz et du fluide, une membrane. Cette membrane est désavantageusement placée à l'extérieur du corps du piston plongeur. Ce système a pour inconvénient un encombrement excessif, un coût de fabrication plus important dû å des pièces mécaniques compliquées. Sur certains dispositifs de ce genre, la membrane est soumise à des déformations non contrôlées qui altèrent sa durée de vie. I1 existe également un troisième système où l'on ne sépare pas le fluide du gaz, ceux-ci se trouvant à l'état d'émulsion.Ce procédé a deux inconvénients majeurs
Le premier, dans le cas de la détente du gaz, il n'est pas possible si on le désire, de réguler uniquement la partie hydraulique, celle-ci contenant le gaz dont on sait que la régulation en débit est facteur de nombreux paramètres.In a second case, a membrane is used for the separation of the gas and the fluid. This membrane is disadvantageously placed outside the body of the plunger. This system has the disadvantage of excessive bulk, a higher manufacturing cost due to complicated mechanical parts. On certain devices of this kind, the membrane is subjected to uncontrolled deformations which alter its lifespan. There is also a third system in which the fluid is not separated from the gas, the latter being in the emulsion state. This process has two major drawbacks
The first, in the case of the expansion of the gas, it is not possible if desired, to regulate only the hydraulic part, this containing the gas of which it is known that the regulation in flow rate is a factor of many parameters.

Le deuxième inconvénient, concerne le cas où le gaz est de l'air et le fluide de l'huile. Dans cette solution, on peut mettre en évidence au moyen d'un système d'agrandissement optique, qu'à certaines pressions et certaines températures, un effet diésel sous forme de micro explosions apparat.The second drawback concerns the case where the gas is air and the fluid is oil. In this solution, it is possible to highlight by means of an optical enlargement system, that at certain pressures and certain temperatures, a diesel effect in the form of micro explosions appears.

Dans le temps ce phénomène occasionne l'altération des joints d'étanchéité en contact avec cette réaction.Over time this phenomenon causes the alteration of the seals in contact with this reaction.

La suspension oléopneumatique selon l'invention permet de remédier à ces inconvénients. Elle permet en effet l'obtention d'une étanchéité dynamique sûre avec un minimum de frottements, ceux-ci n'étant dûs qu'au laminage du fluide et du gaz sur les parois d'une membrane à effet radiale. The oleopneumatic suspension according to the invention overcomes these drawbacks. It indeed makes it possible to obtain a secure dynamic seal with a minimum of friction, these being due only to the rolling of the fluid and of the gas on the walls of a membrane with a radial effect.

L'étanchéité dynamique selon l'invention permet également la préservation de la capacité fluidique de la partie gazeuse donc a possibilité, si cela est nécessaire, de réguler parfaitement le fluide au moment de la détente ou de la compression du gaz. Selon l'invention le système permet aussi la
simplification de la mécanique et un gain d'encombrement de l'ensemble.The dynamic seal according to the invention also allows the preservation of the fluid capacity of the gaseous part, therefore it is possible, if necessary, to regulate the fluid perfectly when the gas is expanded or compressed. According to the invention the system also allows the
simplification of the mechanics and a gain of overall dimensions.

Selon une première variante, le gaz est installé du coté de la paroi exté
rieure de la membrane, à une pression initiale ou non, et le fluide du côté
de la paroi intérieure de la membrane.According to a first variant, the gas is installed on the side of the outer wall
of the membrane, at an initial pressure or not, and the fluid on the side
of the inner wall of the membrane.

Selon une deuxième variante, le gaz est installé du côté de la paroi inté
rieure de la membrane, A une pression initiale ou non, et le fluide du côté
de la paroi extérieure de la membrane. Il est important de noter que selon
l'invention et dans les deux variantes, la membrane se trouve logée dans
l'alésage du piston plongeur.According to a second variant, the gas is installed on the side of the inner wall
of the membrane, at an initial pressure or not, and the fluid on the side
of the outer wall of the membrane. It is important to note that according to
the invention and in both variants, the membrane is housed in
the bore of the plunger.

Le principe selon l'invention, permet en agissant par une force axiale sur
un piston plongeur coulissant étanche dans un corps étanche, de provoquer
une variation du volume compris dans ce corps contenant le fluide. Cette
variation de volume dans le corps a pour effet une composition de pression
agissant radialement sur la paroi de la membrane en contact avec le fluide.The principle according to the invention allows, by acting by an axial force on
a sealed sliding plunger in a sealed body, causing
a variation in the volume comprised in this body containing the fluid. This
variation in volume in the body results in a pressure composition
acting radially on the wall of the membrane in contact with the fluid.

I1 résulte de cette action, une réaction oppose radiale du côté de la pa
roi en contact avec le gaz, celui-ci réagissant selon la loi de Mariotte
(Pression x volume = constante). De ce fait une déformation de la membrane,
proportionnelle au volume déplacé par le piston plongeur, est possible. La
déformation de la membrane ainsi occasionnée, peut être contrôlée par la
présence de pièces mécaniques, dont les formes correspondent aux positions
extrêmes de la membrane lors de son fonctionnement. Ces déformations si
tuées dans l'axe longitudinal, peuvent être connues A la conception même de
la membrane, si le procédé de fabrication est le moulage ou la filière.I1 results from this action, a radial opposite reaction on the side of the pa
king in contact with gas, it reacts according to Mariotte's law
(Pressure x volume = constant). Therefore a deformation of the membrane,
proportional to the volume moved by the plunger, is possible. The
deformation of the membrane thus caused, can be controlled by the
presence of mechanical parts, the shapes of which correspond to the positions
extremes of the membrane during its operation. These deformations if
killed in the longitudinal axis, can be known by the very design of
the membrane, if the manufacturing process is molding or the die.

Les dessins représentés en annexe sont une vue schématique en coupe
des deux variantes dans leurs positions extrêmes. Les déformations dans
l'axe longitudinal ont pour forme celles d'une croix.The drawings shown in the appendix are a schematic sectional view
of the two variants in their extreme positions. The deformations in
the longitudinal axis has the shape of a cross.

Tel qu'il est représenté dans ses deux variantes, le principe schéma
tisé comporte un piston plongeur 1 ajusté coulissant étanche dans un corps
étanche 2. La membrane 3 se trouve placée dans l'alésage du piston plongeur
1. Cette membrane 3 est solidaire du piston plongeur I par une bague 4 as
surant ltétanchéité statique entre le gaz et le fluide. A son autre extrê
mité, la membrane 3 est obturée par un bouchon 5 dont ltétanchéité statique
avec la membrane 3 est assurée par serrage au moyen d'un collier 6 serti.As represented in its two variants, the schema principle
tise includes a plunger 1 fitted sliding sliding tight in a body
waterproof 2. The diaphragm 3 is placed in the bore of the plunger
1. This membrane 3 is secured to the plunger I by a ring 4 as
ensuring the static seal between the gas and the fluid. At its other extreme
mite, the membrane 3 is closed by a plug 5 whose static sealing
with the membrane 3 is ensured by tightening by means of a crimped collar 6.

Lorsqu'on agit par une force suivant F sur le piston plongeur 1, il en ré
sulte une pression proportionnelle PI en VH qui contient le fluide. Cette
pression P1 agit radialement sur la paroi de la membrane 3 caté VH et sous
cette action, une réaction du gaz contenu en VA se traduit par une pression
P2 radiale opposée A Pl. Du fait de la loi sur les gaz (pression x.volume
constante) le gaz contenu en V & se comprime, d'où une réduction de ce volu me VA, laissant la possibilité A la membrane 3 de se déformer et au piston plongeur 1 de s'enfoncer d'une course d correspondant à une nouvelle pression en VH, dûe à la compression du gaz en VA. Cette nouvelle pression sur la section du piston plongeur 1, est la résultante de la force correspondant à F.When one acts by a force according to F on the plunger 1, it re
there is a proportional pressure PI in VH which contains the fluid. This
pressure P1 acts radially on the wall of the membrane 3 category VH and under
this action, a reaction of the gas contained in VA results in a pressure
P2 opposite radial A Pl. Due to the gas law (pressure x.volume
constant) the gas contained in V & is compressed, resulting in a reduction of this volume VA, leaving the possibility for the membrane 3 to deform and for the plunger 1 to sink into a stroke d corresponding to a new pressure in VH, due to compression of the gas in VA. This new pressure on the section of the plunger 1, is the result of the force corresponding to F.

Le dispositif objet de l'invention peut être utilisé dans tous les cas où l'absorption d'inerties dûes à des masses en mouvement est un facteur impératif. The device object of the invention can be used in all cases where the absorption of inertias due to moving masses is an imperative factor.

Ce système est plus avantageux, quand le but recherché est la sensibilité et la fiabilité.This system is more advantageous, when the aim sought is sensitivity and reliability.

Son application peut être très intéressante dans les domaines automobiles, motocycles, engins agricoles et caravaning. Dans les exemples cités, les effets se feraient sentir au niveau du confort, tenue de route et gain de masse. Its application can be very interesting in the automotive, motorcycles, agricultural machinery and caravanning fields. In the examples cited, the effects would be felt in terms of comfort, handling and mass gain.

Claims (10)

REVENDICATIONS 1. Suspension oléopneumatique caractérisée par une membrane à effet radial placée dans l'alésage d'un piston plongeur coulissant étanche dans un corps étanche. 1. Oil-pneumatic suspension characterized by a radial effect membrane placed in the bore of a sealed sliding plunger in a sealed body. 2. Suspension olopneumatique selon la revendication 1, caractérisée par la présence d'un gaz sur la paroi extérieure de la membrane. 2. Olopneumatic suspension according to claim 1, characterized by the presence of a gas on the outer wall of the membrane. 3. Suspension oléopneumatique selon les revendications 1, 2, caracterisée par la présence d'un fluide sur la paroi intérieure de la membrane. 3. Oil-pneumatic suspension according to claims 1, 2, characterized by the presence of a fluid on the inner wall of the membrane. 4. Suspension oléopneumatique selon les revendications 2, 3, caracté- risée par la possibilité de fonctionnement avec le fluide sur la paroi ex térieure de la membrane et le gaz sur la paroi intérieure de la membrane. 4. Oleopneumatic suspension according to claims 2, 3, characterized by the possibility of operation with the fluid on the outer wall of the membrane and the gas on the inner wall of the membrane. 5. Suspension oléopneumatique selon les revendications 1, 3, 4, ca ractérisée par la pression d'un fluide agissant de façon radiale sur la paroi de la membrane. 5. Oleopneumatic suspension according to claims 1, 3, 4, ca reacted by the pressure of a fluid acting radially on the wall of the membrane. 6. Suspension oléopneumatique selon revendication 5, caractérisée par la réaction du gaz sépare du fluide par la paroi de la membrane, dont les effets agissent suivant la loi : Pression x volume = constante. 6. Oleopneumatic suspension according to claim 5, characterized by the reaction of the gas separates from the fluid by the wall of the membrane, the effects of which act according to the law: Pressure x volume = constant. 7. Suspension oléopneumatique selon revendications 1, 2, 3, 4, carac térisée par une membrane en élastomère assurant l'étanchéité entre le gaz et le fluide. 7. Oil-pneumatic suspension according to claims 1, 2, 3, 4, charac terized by an elastomeric membrane ensuring the seal between the gas and the fluid. 8. Suspension oléopneumatique selon revendication 7 caractérisée par une membrane dont les effets radiaux provoquent sur sa section des lignes de déformation dans le sens de son axe longitudinal. 8. Oil-pneumatic suspension according to claim 7, characterized by a membrane the radial effects of which cause deformation lines in its section in the direction of its longitudinal axis. 9. Suspension oleopneumatique selon revendication 8, caractérisée par la possibilité de contrler les lignes de déformation par un procédé de moulage ou d'extrusion de ltélastomère.  9. Oleopneumatic suspension according to claim 8, characterized by the possibility of controlling the deformation lines by a molding or extrusion process of the elastomer. 10. Suspension oléopneumatique selon les revendications 8, 9, carac térisée par l'utilisation possible de pièces mécaniques dont les formes correspondent aux positions extrêmes de la membrane lorsque celle-ci est tirée d'un simple tube.  10. Oil-pneumatic suspension according to claims 8, 9, charac terized by the possible use of mechanical parts whose shapes correspond to the extreme positions of the membrane when the latter is drawn from a simple tube.
FR8208537A 1982-05-13 1982-05-13 OLEOPNEUMATIC SUSPENSION BY RADIAL EFFECT MEMBRANE Expired FR2526903B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8208537A FR2526903B1 (en) 1982-05-13 1982-05-13 OLEOPNEUMATIC SUSPENSION BY RADIAL EFFECT MEMBRANE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8208537A FR2526903B1 (en) 1982-05-13 1982-05-13 OLEOPNEUMATIC SUSPENSION BY RADIAL EFFECT MEMBRANE

Publications (2)

Publication Number Publication Date
FR2526903A1 true FR2526903A1 (en) 1983-11-18
FR2526903B1 FR2526903B1 (en) 1987-04-30

Family

ID=9274088

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8208537A Expired FR2526903B1 (en) 1982-05-13 1982-05-13 OLEOPNEUMATIC SUSPENSION BY RADIAL EFFECT MEMBRANE

Country Status (1)

Country Link
FR (1) FR2526903B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005052402A1 (en) * 2005-10-31 2007-05-03 Faurecia Innenraum Systeme Gmbh Energy absorption body for use in e.g. instrument panel, of motor vehicle, has hollow body including filling and walls, where walls and filling are formed such that hollow body is deformed with force acting in radial direction

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2308404A (en) * 1940-06-24 1943-01-12 Automotive Prod Co Ltd Shock absorrer
GB825094A (en) * 1957-03-12 1959-12-09 Armstrong Patents Co Ltd Improvements in and relating to telescopic hydraulic shock absorbers
GB844653A (en) * 1958-02-12 1960-08-17 Girling Ltd Improvements in hydraulic dampers or shock absorbers
CH369667A (en) * 1959-04-09 1963-05-31 Z V I Plzen Narodni Podnik Hydropneumatic spring element
DE1182534B (en) * 1959-02-06 1964-11-26 Dunlop Rubber Co Pressure medium spring between two vehicle parts that can be moved relative to one another
FR1512209A (en) * 1966-02-26 1968-02-02 Hoesck Ag Monotubular telescopic oscillation damper, especially for vehicles
US3556268A (en) * 1969-01-09 1971-01-19 Moog Industries Inc Gas controlled orifice in hydraulic shock absorber
US3599956A (en) * 1969-08-22 1971-08-17 Coach & Car Equip Corp Fluid cushioning assembly
DE2749674A1 (en) * 1977-11-05 1979-05-10 Karlheinz Menkhoff Telescopic lubricated pneumatic damper - has gas cushion in sealed envelope held in oil covering

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2308404A (en) * 1940-06-24 1943-01-12 Automotive Prod Co Ltd Shock absorrer
GB825094A (en) * 1957-03-12 1959-12-09 Armstrong Patents Co Ltd Improvements in and relating to telescopic hydraulic shock absorbers
GB844653A (en) * 1958-02-12 1960-08-17 Girling Ltd Improvements in hydraulic dampers or shock absorbers
DE1182534B (en) * 1959-02-06 1964-11-26 Dunlop Rubber Co Pressure medium spring between two vehicle parts that can be moved relative to one another
CH369667A (en) * 1959-04-09 1963-05-31 Z V I Plzen Narodni Podnik Hydropneumatic spring element
FR1512209A (en) * 1966-02-26 1968-02-02 Hoesck Ag Monotubular telescopic oscillation damper, especially for vehicles
US3556268A (en) * 1969-01-09 1971-01-19 Moog Industries Inc Gas controlled orifice in hydraulic shock absorber
US3599956A (en) * 1969-08-22 1971-08-17 Coach & Car Equip Corp Fluid cushioning assembly
DE2749674A1 (en) * 1977-11-05 1979-05-10 Karlheinz Menkhoff Telescopic lubricated pneumatic damper - has gas cushion in sealed envelope held in oil covering

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005052402A1 (en) * 2005-10-31 2007-05-03 Faurecia Innenraum Systeme Gmbh Energy absorption body for use in e.g. instrument panel, of motor vehicle, has hollow body including filling and walls, where walls and filling are formed such that hollow body is deformed with force acting in radial direction
DE102005052402B4 (en) * 2005-10-31 2012-03-01 Faurecia Innenraum Systeme Gmbh Energy absorption body, motor vehicle interior trim part and cross member for a motor vehicle

Also Published As

Publication number Publication date
FR2526903B1 (en) 1987-04-30

Similar Documents

Publication Publication Date Title
US20140202809A1 (en) Sealing device and shock absorber with the sealing device
FR2646476A1 (en) HYDROPNEUMATIC ACCUMULATOR FOR FLUID CIRCUIT
FR2473144A1 (en) COMBINED SHOCK AND SUSPENSION DEVICE FOR VEHICLE
JP2014119001A (en) Front fork
JPH01247873A (en) Method and device for sealing
US4709790A (en) Continuously adjustable length adjustment device
US3021926A (en) Shock absorbers or vibration dampers
FR2526903A1 (en) Hydro-pneumatic vehicle suspension - has tubular membrane within piston subjected to radial pressure to give progressive damping
JP3009605B2 (en) Hydraulic tensioner
KR970021829A (en) Vibration damper with adjustable braking force
FR2449827A1 (en) IMPROVEMENT TO A HYDRAULIC SHOCK ABSORBER
KR960004133A (en) Hydraulic power plant
US4126920A (en) Shock absorber with bead-type retainer and method and apparatus for the assembly thereof
NL8202274A (en) SUPPORT FOR VEHICLES.
JPS6323075A (en) Quick release peak clip valve
FR2739668A1 (en) Hydraulic vehicle shock absorber end plug, especially for pressurised monotube type shock absorbers
FR2404768A1 (en) SPRING ACCUMULATOR CYLINDER, ESPECIALLY FOR ROAD VEHICLE BRAKES
BE523726A (en)
FR2499190A1 (en) BITUBULAR HYDROPNEUMATIC SHOCK ABSORBER, IN PARTICULAR FOR DAMPING OSCILLATIONS AFFECTING THE FRONT AXLE OF MOTOR VEHICLES
JP5106321B2 (en) Single cylinder type hydraulic shock absorber
JP6278784B2 (en) Front fork
JPH06207633A (en) Shock absorber
FR3042445A1 (en) SUSPENSION WITH METAL AND HYDROPNEUMATIC SPRING FOR VEHICLE
FR2362310A1 (en) HYDRAULIC SHOCK ABSORBER
JPS6013744Y2 (en) Front fork for motorcycles

Legal Events

Date Code Title Description
TP Transmission of property
TP Transmission of property