CH101528A

CH101528A - Vehicle air suspension.

Info

Publication number: CH101528A
Authority: CH
Inventors: Mercier Henri
Original assignee: Mercier Henri
Priority date: 1921-04-05
Filing date: 1922-04-03
Publication date: 1923-10-01

Description

Saspension pneumatique de Ydhieule. La pr6sente invention se rapporte ä une suspension pneumatique de v6hieule du genre de celles comprenant au moins un eylindre et un piston relks Fun ä un essieu et Fautre au chässis, ainsi qu'un compresseur envoyaat de Fair dans le cylindre qui est muni d'une fuite r6gulatrice. Cette suspension est carac- I#risk en ce que la fuite r6gulatrice est relik ä un r#servoir reli6 lui-mAme au compresseur de fagon que Fair s'6ehappant de la fuite retourne au compresseur, et en ce qu'un es- pace libre est m6nag6 entre le cylindre et le piston, en aval d'une garniture dispos#e entre ces deux organes, espace communi- quant avec Vair atmosph6rique et relig au compresseur de faVon que le Jubrifiant s'd- chappant de la garniture retourne au com- presseur. Pneumatic saspension of Ydhieule. The present invention relates ä to a pneumatic vehicle suspension of the kind comprising at least one cylinder and a piston connected to one axle and the other to the chassis, as well as to a compressor sends Air into the cylinder which is fitted with a regulating leak. This suspension is characterized in that the regulating leak is connected to a reservoir itself connected to the compressor so that the air escaping from the leak returns to the compressor, and in that a free space is left between the cylinder and the piston, downstream of a seal disposed between these two organs, a space communicating with the atmospheric air and connected to the compressor so that the lubricant is released. - leaking from the gasket returns to the compressor.

Le dessin ci-annex6 repr#sente, ä, titre d'exemple, deux formes d'exkution de Fob- jet de l'invention. The accompanying drawing represents, ä, by way of example, two embodiments of the object of the invention.

La fi;-, 1 se rapporte ä la premibre et la fig. 9, ä la seconde forme d'ex#cution; les fig. 3 et 4 montrent des variantes de dAtail. The fi;-, 1 refers to ä the first and fig. 9, ä the second form of execution; the figs. 3 and 4 show variations of dAtail.

En fig. 1, 1 est Vessieu, 92 est la partie mobile de la suspension relide äFes- sieu, 3 est la partie fixe de la sus- pension relige au chässis du v61liculei 4 est un cuir embouti, 5 est le com- presseur aetionn6 par le moteur du Whicule, 6 est un distributeur command6 synchro- niquement avec le compresseur etä une vi- tesse-telle qu'ä cliaque coup de piston Fair comprim6 soit successivement dirig6 par les quatre conduits 7, 8, 9,10 aux quatre appa- reils de suspension de la voiture, dans le cas oü cette derniöre est munie de quatre dispo- sitifs de suspension. 11 est Forifice de fuite r6gulatrice. L'air comprim6 s'dehappant de la fuite r6gulatrice s6coule par le conduit 12 daus un r6servoir 13 dans Iequel Ubouchent 6,calement les tubes 14,15, 16 en relation avec les trois autres appareils de suspension du v6hicule non Tepr6sent6s. Quatre soupapes 17, 18, 19, 20 sont disposges sur les raccords des tubes 12, 14,15, 16 avec le rdservoir 13. Ce r6servoir est muni dune soupape 21 U- bouchant ä l'air libre et comportant un res- sort tar6, de telle sorte qu'elle s'ouvre lors- que la pression, dans le rgservoir 13, atteint une certaine 'valeur. RTI ID="0001.0271" WI="5" HE="4" LX="1350" LY="2239"> Le r4servoir 1.3 com- munique avee le compresseur par un conduit- 22 ei le compresseur est reli6 au distributeur 6 par un conduit de refoulement 23. In fig. 1, 1 is the axle, 92 is the moving part of the relide suspension äFes- sieu, 3 is the fixed part of the suspension connected to the chassis of the vehicle 4 is a pressed leather, 5 is the compressor driven by the engine of the vehicle, 6 is a distributor controlled synchronously with the compressor and ä a speed such that each blow of the compressed piston is successively directed by the four conduits 7, 8, 9, 10 to the four suspension devices of the car, in the case where the latter is fitted with four suspension devices. 11 is the regulating leak orifice. The compressed air escaping from the regulating leak flows through conduit 12 into a reservoir 13 in which the tubes 14,15, 16 in connection with the three other vehicle suspension devices not shown. Four valves 17, 18, 19, 20 are arranged on the connections of the tubes 12, 14,15, 16 with the tank 13. This tank is provided with a valve 21 U- blocking ä the free air and comprising a spring loaded, so that it opens when the pressure, in the tank 13, reaches a certain 'value. RTI ID="0001.0271" WI="5" HE="4" LX="1350" LY="2239"> The tank 1.3 communicates with the compressor by a pipe 22 ei the compressor is connected to the distributor 6 by a discharge pipe 23.

Le compresseur porte deux soupapes dites d'aspiration 24 et'25, une soupape de re- foulement 26 ei, en outre, son earter Manche est muni de deux soupapes, une soupape d'as- piration 27 et une soupape de refoulement 28. Les dispositifs de suspension comportent des gorges annulaires telles que 29, mises en communication, cl'une paTt, aver, Vair atmos- ph6riqi.ie par un conduit h61icoidal tel que 30 ei, d'autre part, avee le carter du com- presseur par des tubes 31, 32, 33, 34,35. The compressor carries two so-called suction valves 24 and 25, a discharge valve 26 and, in addition, its sleeve collar is provided with two valves, a suction valve 27 and a discharge valve 28. The suspension devices comprise annular grooves such as 29, placed in communication, one side, with , Atmospheric air through a helical conduit such as 30 and, on the other hand, with the compressor housing through tubes 31, 32, 33, 34,35.

Enfin Fair et l'huile expuls6s da carter du compresseur par le tube 36 d6bouchent au-dessus de la tubulure 37 de Paspiration ä Pair libre du compresseur. Finally, air and the oil expelled from the compressor crankcase through tube 36 come out above the pipe 37 of the suction ä Compressor Free Pair.

Le fonetionnement est le suivant: L#3 dispositif gtant sans pression et les appareils de süspension kant ä fond da course, on met le compresseur en marche. Celui-ei aspire de l'air atmosphgrique par la tubulur-- 37 et la soupape 25 ei le refotilp par la soupape 26 ei le conduit 23 au distri- buteur 6 qui r6partit cet, air successivement aux quatre appareils de suspension par les conduits 7, 8, 9, 10. The operation is as follows: With the #3 pressureless device and the suspension devices as they ä bottom da run, the compressor is started. This one draws in atmospheric air through the tube 37 and the valve 25 and refotilp it through the valve 26 and leads it 23 to the distributor 6 which distributes this air successively to the four suspension devices through the ducts 7, 8, 9, 10.

La pression s'61evaiit peuä peu, les appa- reils de suspension soukvert le vg'hiciile et prennent la position reprgsentge, ja. pression dans chaque appareil correspondant alors exaetement i# la charge respective sur elia- eun d'eux. A partir de ce moment, Vair comprim6 et charg6 d'huile qui est dAitA par le compresse-Lir aux appareils de sits-pen- sion s'koule ä travers les orifiees de fuite (11 pour l'appareil de suspension repr6sent#) par les tubes 12, 14,15, 16 en soulevant les elapets de retenue 17, 18, 19, 20 dans le r#- servoir 13, ei la pression , flans ce r#servoir prend une valeur qui ne peut exeMer up. chif- fre converablement choisi, en raison de l'exis- fence de 1,9, sou-pape IM. The pressure gradually rose, the suspension apparatus lifted the vehicle and assumed the position shown, ja. pressure in each corresponding device then exactly i# the respective load on elia- eun of them. A from this moment, the compressed and oil-laden air which is delivered by the Lir-compressor to the sit-board apparatus flows ä through the openings (11 for the suspension apparatus shown#) through the tubes 12, 14,15, 16 by lifting the retaining tabs 17, 18, 19, 20 in the reservoir 13, ei the pressure , on the sides of this reservoir assumes a value which cannot be increased. figure properly chosen, due to the existence of 1.9, valve IM.

Mais alors, le compresseur contintiant ä fonetionner, cesse de puiser de Vair atmos- phArique par 1,9, sou-Pape 25, l'alimentation se faisant de prgfgrence par la soupape 24 en relation avec le r*6servoir 13, en raison de la, pression sup6rieure existant dans ce r6ser- voir. 11 s'6tablit ainsi une eireulation continne de Fair comprim6 chargg d'huile, sans autre dkente que celle r#sultant des pertes de charge dans les conduits, le eompresseur agis- sant surtout comme un ddplaeeur d'air saus absorption de travail m6canique de compres- RTI ID="0002.0272" WI="7" HE="4" LX="1278" LY="513"> sion, une fois la pression de r6,-ime atteinte. Pendant tout le temps du fonetionnement du compresseur, une succion continue s'exeree, par le earter 6tanelie, muni de soupapes, au travers des conduits 35, 31, 3-9, 33, 34, dans les gorges telles que 29, la petite quantit6 d'air rentrant par les rainures 30 entrainant la masse d'huile d6boueliant des Igarnitures jusqu'au earter du compresseur A elle est utilisk pour le lubrifier; l'exe6dent, s'il y en a, s'Aehappe par le concluit 36; l'huile skouie du conduit 36 dans la. tubulure 37, et de IA dans la chambre cle la soupape 25 d'oü elle est reprise ei r#eiip#rAe dAs la prcmi & re aspi- ration d'air "itmosph#rique. But then, the compressor continuing ä to operate, ceases to draw atmospheric air by 1.9 centimeters 25, the supply being preferably made by the valve 24 in relation to the r *tank 13, due to the higher pressure existing in this tank. 11 A continuous eulation of the oil-laden compressed Air is thus established, with no other displacement than that resulting from pressure drops in the ducts, the compressor acting above all as an oil displacer. air without absorption of mechanical work of compression RTI ID="0002.0272" WI="7" HE="4" LX="1278" LY="513">, once the residual pressure has been reached. Throughout the operation of the compressor, a continuous suction is exerted, by the exhaust valve, provided with valves, through the conduits 35, 31, 3-9, 33, 34, in the grooves such as 29, the small amount of air entering through the grooves 30 carrying the mass of oil deboiling from the seals to the sump of the compressor A it is used to lubricate it; the excess, if any, escapes through the end 36; the oil drains from the duct 36 into the. tubing 37, and from IA into the chamber of the valve 25 from where it is taken up and r#eiip#rAe dAs the first aspiration of air "itmospheric.

A la place du seul Hservoir 13, on pour- rait en pr6voir quatre. Chac-un. de ces r#,ser- voirs serait alors respectivement affeef# ä un appareil de suspension ei un distributeur analogue ä cel-Lii indiqu# en6 serait interposg entre les r#servoirs ei le eonduit 22 d6bou- chant dans le eompresseur par la soupape 21. A instead of the single Htank 13, four could be provided. Each. of these reservoirs would then be respectively affeef# ä a suspension device and a similar distributor ä cel-Lii indicated# in6 would be interposed between the tanks ei the pipe 22 emerging into the compressor through the valve 21.

Dans la forme d'exkution de fig. 2, le compresseur eomme les rgservoirs sont aussi communs aux quatre appareils de suspension du v6hieule. 38 est la, gorge annulaire dis- posk dans le corps 3 en aval de la garniture 4 de la suspension. 39 est la gorge h61icoi- dale qui met cette gorge 38 en communica- tion #trang16e avee Vatmosph#re. 40 est le conduit qui müt en eommunication la gorge 38 avee le compresseur, jouant ici le räle d'aspirateur. In the exkution form of fig. 2, the compressor and the tanks are also common to the four vehicle suspension devices. 38 is the annular groove provided in the body 3 downstream of the trim 4 of the suspension. 39 is the helical groove which puts this groove 38 in #trang16e communication with the atmosphere. 40 is the duct which communicates the groove 38 with the compressor, here playing the role of aspirator.

Le compresseur eomporte une soupape d'aspiration 41 automatique, une soupape d.3 refoulement 42 ei une soupape dIaspiration .13 munie d'un ressort suffisant pour qu'elle. ne puisse s'o-tivr;r que sous l'aetion d'nn cul- buteur 44 aeii;onne par une tige 45 qui est elle;-m#me eommandAe par Parbre du com- presseur au moyen d'une eame. Eaxe du culbuteur esc. month sur un le- vier 46, pivota#t autour d-un axe 47. Ce levier est aetionn6 par un piston 48 et par un ressort antagoniste tarä 49 qui le, ramkie, automatiquement dans la position rel)r6sen- t6e au dessin. Le piston 48 est soumis, par le conduit 50, ä la pression r6giiant dans le conduit 51 de refoulement du compresseur au r6servoir 59-. The compressor has an automatic suction valve 41, a d.3 discharge valve 42 and a suction valve .13 provided with a sufficient spring for it. can only be opened under the action of a rocker arm 44 aeii;on by a rod 45 which is itself eommandAe by the shaft of the compressor by means of a eame. Shaft of the rocker arm esc. month on a lever 46, pivota # t about an axis 47. This lever is aetionn6 by a piston 48 and by a counter spring tarä 49 which, ramkie, automatically in the position rel) r6sen- t6e in the drawing. The piston 48 is subjected, by the conduit 50, to the pressure governing in the conduit 51 from the compressor to the tank 59-.

Enfin, le compresseur comporte un ori- fice d'admission ä fin de course 53 qui com- munique, par un conduit 54, avee. un r6ser- voir 55; ce dernier comporte une soupape 56 faisant communiquer ce r4servoir a-vec Pat- mospl-i6re et munie dun ressort targ, de telle sorte que cette soupape ne s'ouvre que si la pression, dans le rAservoir 55, atteint une certaine valeur. 57 est le distributeur du clispositif de suspeDsion comportant un tiroir 58, dont la tige est maintenue en contart avee une eame 60, relke ä Fessieu, par le galet 59, sous Vaction de Vair comprimg. II existe autant de distributeurs qu'il y a dap- pareils de suspension sur la voiture. Finally, the compressor comprises an inlet orifice ä end of stroke 53 which communicates, via a duct 54, with it. a reservoir 55; the latter comprises a valve 56 communicating this reservoir with the Patmospl-i6re and provided with a spring loaded, so that this valve only opens if the pressure in tank 55, reaches a certain value. 57 is the distributor of the suspension device comprising a drawer 58, whose rod is held in contact with a eame 60, relke ä The axle, by the roller 59, under the action of compressed air. There are as many distributors as there are there suspension devices on the car.

Chaque distributeur est en communica- tion avee l'appareil de suspension par un conduit 61, qui sert indiff6remment ä Vad- Mission ou ä. Füchappement (fuite r6gula- trice) de Fair comprim6 charg6 d'huile de la suspension et eeci, selon la position du tiroir 58 fonetionnant en coneordance des besoins de la suspension. Cette derni & e se trouve soit isolk (position dessink), soit en communi- cation avee le r6servoir 5:), par le conduit 62 pour Fadmission, soit en communication, par le conduit. 63, avec le r6servoir 55 pour l'6- chappement. Each distributor is in communication with the suspension device by a duct 61, which is used either ä for the admission or ä. for the exhaust. (regulatory leak) of a tablet charged with suspension oil and this, depending on the position of the 58 spool operating in accordance with the needs of the suspension. The latter is either isolated (position drawn), or in communication with the tank 5:), by the duct 62 for admission, or in communication, by the duct. 63, with tank 55 for the exhaust.

Le fonetionnement est le suivant: Le dispositif Uant saus pression et les appareils de stispension reposant ä fond de course, on met le compresseur en marche. Celni-ei exeree une aspiration, d'abord par la soupape 41 et le tube 40 dans la gorge 38, er6ant la d(,pression nkessaire, pour produire cet effet N, de la course totale environ), la soupape 43 se kve sous Paction du cullbuteur 44 et de la tige 45, ac-honnge par la eame sus-mentionnge. Le piston effectue la pres- que totalit6 de sa course dans ces conditions, en aspirant de Vair atmosphrique; la.sou- pape 43, sous l'aetion du eulbuteur 44, se referme avant que le RTI ID="0003.0278" WI="10" HE="4" LX="1379" LY="276"> piston ne d6couvre Fori- fice 53. Ensuite, le piston, revenant en sens inverse, refoule,- par la soupape 42 et le con- duit 51, Fair aspir6 dans le rdservoir 52 et dans les appareils de suspension par les con- duits 62 et61, le tiroir 58 du distributeur 57 se trouvant alors dans la position con- venable pour permeitre ce passage de Fair. Lorsque la pression a atteint la valeur ngces- saire, la suspension fonetionne, soulev#nt la voiture, la came 60 en se d6plagant inter- rompt, par l'interm6di-,tire du tiroir 58, la communication entre le conduit 62 et le con- duit 61. Dans ces conditions, la pression s'616ve dans le r#servoir 5-9 jusqu'L- ce que, par la ddrivation 50, Fair comprim6 actionne Je piston 48, malgr# la r6sistance antago- niste du ressort 49. Le levier -16 base.ule au- tour de 47 et gearte le culbuteur - 44 de la soupape 43 et de la tige de commande 45. La soapape 43, mainterue sur son skge par son ressort, cesse de fonetionner et il en rgsulte que le compresseur c.esse d'aecumuler de Fair dans le r6servoir 52-, l'appel dair s'effeeti.iaat par la, soupape 41 kant assez minime pour pouvoir Atre voiisiddr6 comme n6o-ligeable. The operation is as follows: With the device under pressure and the stispension devices resting ä at bottom, the compressor is started. This exerts a suction, first through the valve 41 and the tube 40 in the throat 38, creating the necessary depression to produce this effect N, Approximately total stroke), the valve 43 is kve under the action of the rocker arm 44 and the rod 45, ac-honnge by the above-mentioned eame. The piston completes almost all of its stroke under these conditions, drawing in atmospheric air; the valve 43, under the action of the thruster 44, closes before the RTI ID="0003.0278" WI="10" HE="4" LX="1379" LY="276"> piston discovers Forifice 53. Then, the piston, returning in the opposite direction, pushes back through the valve 42 and the conduit 51, Aspirated into the reservoir 52 and in the suspension devices through the ducts 62 and 61, the drawer 58 of the dispenser 57 being then in the suitable position to allow this passage of Fair. When the pressure has reached the necessary value, the suspension operates, lifting the car, the cam 60 interrupted by moving, through the intermediary of the drawer 58, the communication between the conduit 62 and the conduit 61. Under these conditions, the pressure rises in the tank 5-9 until, by the diversion 50, the compressed air actuates the piston 48, despite the opposing resistance of the spring 49. The lever - 16 base.ule around 47 and engages the rocker arm - 44 of the valve 43 and of the control rod 45. The soapape 43, held on its seat by its spring, stops working and the result is that the compressor stops accumulating air in the reservoir 52-, the call for air is effected through the valve 41, which is small enough to be seen as negligible.

Lorsque, par suite des ir6pidations de la suspension, le tiroir 58 se d6place sous Fac- tion de la came 60, permeitant ainsi la mise en communication des conduits 61 et63, Vair comprim6 de la suspension s'6chappe par61 et63 et la, pression dans le r6servoir 55 S,616ve. When, as a result of the irpidations of the suspension, the slide 58 moves under the action of the cam 60, thus allowing the communication of the conduits 61 and 63, The compressed air in the suspension escapes through 61 and 63 and the pressure in the reservoir 55 S,616ve.

Si cette pression s'61#ve au-dessus du taux fix6 par la chaTge de la so-Lipape 56, il y a gehappement ä Fair libre. If this pressure rises above the rate set by the pressure of the valve 56, there is there an escape ä Fair free.

Mais qLte la soupape 56 souvre ou ne s'ouvre pas, le compresseur continuant ä tourner, l'air sous pression et non d6tendu (ou ä peine d6tendu) venant de Fappareil de suspension dans le r6servoir 55 passe par le conduit 54 et, lorsque le piston dans son mouVement alfernatif dgeouvre 53, cet air vient remplir le cylindre ou mAme s'ajoufer. # de Fair atmospligrique d6jä aspir6 par 41 et 4-3, puis toute cette masse de gaz est refou16e par la soupape 4,9 dans le r6servoir 52 et de Iä sert ä nouveauä alimenter les appareils de suspension. But whether the valve 56 opens or does not open, the compressor continuing ä to turn, the air under pressure and not expanded (or ä > barely relaxed) coming from the suspension device in the tank 55 passes through the conduit 54 and, when the piston in its alternating movement opens 53, this air fills the cylinder or even add. # of atmospheric air already sucked in by 41 and 4-3, then all this mass of gas is discharged through valve 4.9 into tank 52 and from there is used ä newä powering suspension devices.

La d6pression dans la gorge 38 ou 29 peut Atre obtenue par tout autre moyen connu, par une pompe inUpendante, par exemple, actionnk par le moteur, par Vessieu ou par la suspension mAme. The depression in the throat 38 or 29 can be obtained by any other known means, by an independent pump, for example, actuated by the engine, by the axle or by the suspension. same.

La fig. 3 repHsente une garniture qui a l'avantage de donner une 6tanch#itA parfaite avee, un frottement moindre que les gariii- tures en euir embouti 4 montrks aux fig, 1 et29. Sur eette figure, le euir embouti est repr#sent6 en 64, adoss6 ä Lin certain nombre de se-Ments fendus, extensibles, tels que 65, 66, 67, dont les fentes respectives 68, 69, 70 sont dAeaMes les unes par rapport a-Lix autres et ne peuvent se mettre en coineidence par suite de la pression du cuir ei de sa p6n6tra- tion dans les fentes, infentionnellement lais- s6es assez larges. Ce sont les segments 65, 06# 67 qui frottent sur Faksage du cylindre. fig. 3 represents a seal which has the advantage of giving a perfect seal with less friction than the stamped euir seals 4 shown in figs, 1 and 29. In this figure, the stamped euir is represented at 64, backed ä by a certain number of split, extensible se-Ments, such as 65, 66, 67, whose respective slots 68, 69, 70 are dAeaMes with respect to each other and cannot be put in coinidence as a result from the pressure of the leather and its penetration into the slits, intentionally left wide enough. These are the rings 65, 06# 67 that rub on the Faksage of the cylinder.

La fig. 4 est une variante (In dispositif de la, fig. 3; le euir embouti est remplae6 par un segnient 71, fendtt suivant une g#n#- ratrice ei adossA aux segments 792 ei73 qui frottent sur l'aMsage du cylindre. Les fentes des sel-ments 71, 72, 73 sont dispos6es de faVon ä ne pouvoir coineider, ainsi qLie daus le dispositif de la -fig. 3. fig. 4 is a variant (In device of the, fig. 3; the stamped euir is replaced by a segment 71, fendtt following a g# n#- ratrice ei adossA aux segments 792 ei73 which rub on the bore of the cylinder. B> are arranged in such a way ä that they cannot coincide, as well as in the device in Fig. 3.

Claims

CLAIM - Plit.,umatic suspension of a vehicle, comprising at least one cylinder and a piston connected to Fun ä one axle and the other to the eliässis# as well as a compressor sending air into the cylinder which is provided with a r6aulatrice leak, earaet, 6ris6e in that the latter is connected ä a reservoir connected himame to the compressor so that the air escaping from the leak returns to the compressor, and in that a free space is created between the cylinder and the piston, downstream of a seal arranged between these two organs, g the c-,-space communicates with atmospheric air and is connected to the compressor so that the lubricant escaping from the packing returns to the compressor. SOT-TS-CLAIMS: I Pneumatic suspension according to claim, ä several cylinders and pistons comprising a closed reservoir, which is connected, by means of suitable lines, with RTI ID="0004.0274" WI="4" HE="4" LX="1356" LY="571"> regulated cylinder leaks, which is equipped with a relief valve ä Fair free, whose spring is tar6 ä a Uterrninge value, and which communicates by a valve with the eliambre de Pune of the aspiration valves of the compressor, of which the, second suction valve is in relation with the atmosphere, while the discharge valve of this compressor puts it in communication with a distributor sending Air con-Lprini('-- to the e-y- linders, l the space on, 3-ineutionn6 being constituted by a throat connected with the compressor's sump, for the aspiration of the leaks of lubricant, the excess of oil sent in this sump is refu16 by a i, tiyiiutery in the free air suction pipe of the compressor.

2 Pneumatic suspension according to the revelation, with several cylinders and pistons, comprising a compressor which is connected by a suction valve with the free spaces mentioned above and which has a second controlled suction valve by means of a eulbutmir activated by the compressor which delivers the compressed air into an elos tank, this suction valve remaining closed as long as the pressure (in the closed tank) reaches a certain value. of this tank passing through the cylinders via the intermediary of the distributor drawer is placed ä Action by a shaft connected h, to the axle of the vehicle, ee distributor valve also connecting, when the tank is in place, the cylinders with a second auxiliary tank provided with a valve of escape tark, by which can produce the fuhe, regulator, while this valve of escape leakage, remaining or not ferrak, the compressor

sister draws in the necessary air from this second auxiliary reservoir and delivers it into the cylinders allowing the compressed air to perform a closed eire-Liit. 3 Pneumatic suspension according to the claim, characterized in that the aforementioned lining comprises an inner segment covered with split segments in contact with the surface of the cylinder and of which the slots are d6ea.16es relative to each other, so as to eliminate leaks.