EP3126669A1 - Hydraulic apparatus having an additional thrust section - Google Patents

Hydraulic apparatus having an additional thrust section

Info

Publication number
EP3126669A1
EP3126669A1 EP15713886.8A EP15713886A EP3126669A1 EP 3126669 A1 EP3126669 A1 EP 3126669A1 EP 15713886 A EP15713886 A EP 15713886A EP 3126669 A1 EP3126669 A1 EP 3126669A1
Authority
EP
European Patent Office
Prior art keywords
cylinder block
shaft
assembly
distributor
additional section
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
EP15713886.8A
Other languages
German (de)
French (fr)
Other versions
EP3126669B1 (en
Inventor
Clément Philippe RECOURA
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.)
Poclain Hydraulics Industrie
Original Assignee
Poclain Hydraulics Industrie
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
Application filed by Poclain Hydraulics Industrie filed Critical Poclain Hydraulics Industrie
Publication of EP3126669A1 publication Critical patent/EP3126669A1/en
Application granted granted Critical
Publication of EP3126669B1 publication Critical patent/EP3126669B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/22—Reciprocating-piston liquid engines with movable cylinders or cylinder
    • F03C1/223—Reciprocating-piston liquid engines with movable cylinders or cylinder having cylinders in star or fan arrangement, the connection of the pistons with an actuated element being at the inner ends of the cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/003—Reciprocating-piston liquid engines controlling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/10—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary
    • F04B1/113—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary with actuating or actuated elements at the inner ends of the cylinders
    • F04B1/1133—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary with actuating or actuated elements at the inner ends of the cylinders with rotary cylinder blocks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control

Definitions

  • the present invention relates to the field of hydraulic apparatus.
  • a hydraulic apparatus 1 comprises a shaft 2, a cam 3 typically a multilobe cam, a cylinder block 4, an ice or dispensing assembly 5 comprising a distributor 51 and a distributor cover 52, and a housing 6.
  • the cylinder block 4 is placed inside the ring forming the cam 3.
  • It defines a plurality of cylinders 41 oriented radially with respect to an axis X-X 'of rotation (see FIGS. 1a and 1b) and opening onto the outer peripheral face of the cylinder block 4 facing the cam 3.
  • a piston 42 is mounted to slide radially respectively in each of the cylinders 41. Each piston 42 bears on the radially inner surface of the cam 3.
  • the cylinder block 4 has a central bore through which it can be engaged on the end of the shaft 2 of the hydraulic apparatus 1.
  • the ice or dispensing assembly 50 is formed of a distributor 51 and a distributor cover 52 which are adapted to controllably apply a pressurized fluid successively to each of the pistons 42, more precisely to the internal chamber of the cylinders. 41 adjacent to the pistons, so that the successive support of the pistons 42 on the lobes of the cam 3 causes the relative rotation of the cylinder block 4 and elements which are linked to it with respect to the cam 3.
  • the distributor 51 is rotatable along an axis collinear with X-X ', which is the axis of the shaft 2.
  • the ice or dispensing assembly 50 includes two chambers 511, 521 and 512, 522 receiving a fluid under high or low pressure depending on the mode of operation of the apparatus.
  • Hydraulic devices having a disengagement mechanism and push clutch, thus allowing a freewheel configuration, ie the hydraulic apparatus 1 operates without pressure (the pistons 42 therefore do not move back and forth at contact of the cam 3) and a working configuration, ie a configuration in which the hydraulic apparatus operates with a pressure and a fluid flow rate, the pistons 42 reciprocating in contact with the cam.
  • each channel may be low or high pressure and is adapted to be respectively connected to a hydraulic supply circuit 71, 72 (see Figures 3a and 3b). Each circuit can be low or high pressure depending on the mode of operation.
  • the grooves 511 and 512 made in the distributor 51 each have a lateral wall on the side in the direction of the cylinder block 4. As mentioned above, the supply of fluid under low or high pressure will tend to move the distributor 51 towards the block. cylinders 4 under the effect of the force resulting from the pressure applied to these side walls.
  • the level of engagement of the cylinder block 4 on the shaft 2 depends directly on the pressure, said pressure being itself correlated to the torque of the apparatus 1.
  • the pressure applied to engage the cylinder block 4 on the shaft 2 is therefore not constant, which is not desirable for a clutch.
  • the feeding is provided by a pump 9 said pump booster, which ensures a minimum pressurization of the hydraulic circuits 71, 72.
  • the gavage pressure is of the order of the low pressure, that is to say typically about ten bars.
  • the objective is therefore to provide a new device for improving the engagement of the cylinder block 4 on the shaft 2.
  • the present invention aims to propose a system that does not have such disadvantages.
  • the invention relates to a dispensing assembly of a radial piston hydraulic apparatus, said apparatus comprising a cylinder block engageable on a shaft by translation, said assembly comprising:
  • First and second chambers respectively defined by first and second volumes located at the interface between said distributor and said dispensing cover, and for pressurized fluids for mechanical-pressure conversion
  • said assembly being characterized in that it further comprises an additional section defined by a third volume located at the interface between said distributor and said dispensing cover, said section being intended to receive a fluid under pressure to allow the engagement of the cylinder block on the tree.
  • the invention may include the following features, taken alone or in combination:
  • the additional section is wholly or partly radially outwardly to the first and second chambers, so that the surface of said additional section is larger.
  • the supply of the additional section is made by selection between the lowest pressure between the two pressures relative to the first and second chambers.
  • the dispensing assembly includes an open center low pressure selector adapted to select between the lower pressure between the two pressures relative to the first and second chambers.
  • the additional section is not rectilinear radially, but typically S or Z, to optimize the volume and tightness.
  • Another object of the invention relates to a hydraulic apparatus comprising a distribution assembly as previously described, said assembly allowing in particular the engagement of said cylinder block on said shaft.
  • the invention may comprise the following features, taken alone or in combination: - the distributor cover and the housing are integral or form a single piece.
  • a final subject of the invention concerns a method of engaging a cylinder block of a hydraulic apparatus on a shaft, using a previously described distribution assembly in which:
  • the additional section is pressurized by a fluid
  • the dispenser is solicited consecutively to the pressurization by a fluid of the additional section,
  • FIG. 1a is a diagram of a partial sectional view of a device belonging to the state of the art
  • FIG. 1b shows a sectional view of a hydraulic apparatus belonging to the state of the art
  • FIG. 2a is a diagram of a partial sectional view of an alternative hydraulic apparatus according to one aspect of the invention.
  • FIG. 2b shows a sectional view of a hydraulic apparatus according to the invention
  • FIGS. 3a and 3b show two views of an example of integration of a variant of hydraulic apparatus according to one aspect of the invention on a vehicle axle
  • Figure 2a shows a partial sectional view of a hydraulic apparatus and a dispensing assembly according to one embodiment of the invention.
  • the axis of rotation X-X 'of the hydraulic apparatus and a Y-axis Y' of radial extension are shown in Figures 2a and 2b.
  • one of the embodiments of the clutch system consists in translational engagement of the cylinder block 4 on the shaft 2.
  • a distribution plane 53 is defined between the distributor 51 and the cylinder block 4, corresponding to the faces of the distributor 51 and the cylinder block 4 adapted to be brought into contact with one another.
  • the sealing is ensured by the particular configuration of the grooves 511 and 512 which ensures a self-maintenance between the cylinder block 4 the distributor 51.
  • the distributor cover 52 is typically fixed and integral with the casing 6 and in particular fixed in translation along the axis X-X '. Alternatively, the dispenser cover 52 may form a single piece with the casing 6.
  • An additional section 54 is added between the dispenser 51 and the cover 52. This additional section 54 is a volume in which a fluid under pressure can circulate.
  • a first inner wall 541 of said additional section is constituted by the distributor 51 and a second inner wall 542 is constituted by the cover 52.
  • the surface of the first wall 541 is substantially perpendicular to the shaft 2 and is the largest possible.
  • the additional section 54 is preferably located wholly or partly radially outwardly of the channels 511, 521 and 512, 522 along the Y-Y 'axis. Indeed, since the assembly is generally cylindrical in revolution about the axis X-X ', the further the additional section 54 is located radially, the greater the area of the first wall 541 of the additional section 54 may be important .
  • the additional section is preferably longitudinally located between the cylinder block 4 and the two chambers 511, 521, 512, 522.
  • Sealing means 543 are also provided, such as seals, for sealing the additional section 54 for receiving a fluid under pressure.
  • the additional section 54 is S-shaped or Z-shaped. Such a shape makes it possible to optimize the volume gain and makes it possible to house gaskets 543 by axial sliding.
  • the additional section 54 is rectilinear.
  • the additional section 54 is intended to be supplied with a pressurized fluid via a feed channel 55 positioned in the dispenser cover. Thanks to the surface of the first wall 541, the pressurized fluid exerts a collinear force to the axis XX 'on the distributor 51. The distributor 51 being in contact with the cylinder block 4 by the contact surface 53, the force is transmitted to the cylinder block 4 which engages on the shaft 2.
  • the additional section is fed by the lower pressure of the two hydraulic supply circuits 71, 72.
  • the two hydraulic circuits 71, 72 can be low or high. depending on the operating mode of the hydraulic apparatus 1.
  • the two hydraulic supply circuits 71, 72 are connected to a selector 9, said selector 9 being connected to the additional section 54 via the supply channel 55.
  • selector 9 is adapted to select the lowest pressure between the two circuits hydraulic feed 71, 72.
  • the inputs of the selector 9 are connected to the two hydraulic circuits 71, 72 which can each be high and low pressure.
  • the output of the selector 9 is connected to the supply channel 55.
  • the selector 9 is an open-center selector: in fact, in particular at the start of the hydraulic apparatus, the two hydraulic circuits 71, 72 are put to a feeding pressure by the pump 7 called the booster pump, shown schematically ( Figures 3a and 3b) as a hydraulic pump.
  • the pressures in the two hydraulic circuits 71, 72 being at this time almost equivalent, the selector 9 open center will supply the additional section 54 from the start of the hydraulic device 1.
  • the supply duct 55 connects the selector 9 to the additional section 54.
  • said supply duct 55 is advantageously all or part at least in another plane than the additional section 54 (duct). supply 55 shown in dashed lines in Figure 2b).
  • the additional section 54 is directly supplied by the booster pump 7 via the supply channel 55.
  • the hydraulic devices 1 concerned are typically radial pistons 42 and multilobe cam 3.
  • the pistons 42 are kept in contact with the cam 3 by thrust springs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Abstract

The invention relates to a valve assembly (50) of a radial piston hydraulic apparatus (1). Said apparatus includes a cylinder block (4) insertable onto a shaft (2) by translation. Said assembly (50) includes: a valve (51) in contact with said cylinder block (4); a valve train cover (52); and a first (541) and second (542) chamber that are defined, respectively, by a first (511, 521) and second (512, 522) space that are located at the interface between said valve (51) and said valve train cover (52), and are intended for the pressurized fluids that enable the conversion of pressure and/or mechanical stress. Said assembly (50) includes an additional section (54) defined by a third space (541, 542) located at the interface between said valve (51) and said valve train cover (52). Said section (54) is intended for receiving a pressurized fluid such as to enable the cylinder block (4) to be inserted onto the shaft (2).

Description

APPAREIL HYDRAULIQUE AVEC SECTION ADDITIONNELLE DE POUSSEE DOMAINE TECHNIQUE GENERAL  HYDRAULIC APPARATUS WITH ADDITIONAL PUSH SECTION GENERAL TECHNICAL FIELD
5 La présente invention concerne le domaine des appareils hydrauliques. The present invention relates to the field of hydraulic apparatus.
En particulier, il concerne les moyens associés pour permettre la mise en couple de tels appareils hydrauliques.  In particular, it relates to the associated means for enabling the coupling of such hydraulic devices.
ETAT DE L'ART STATE OF THE ART
10  10
Dans l'ensemble du présent texte, on désignera par appareil hydraulique un appareil pouvant fonctionner en tant que moteur ou que pompe hydraulique. Comme représenté sur les figures la et lb, un appareil hydraulique 1 comprend un arbre 2, une came 3 typiquement une came 15 multilobe, un bloc cylindres 4, une glace ou ensemble de distribution 5 comprenant un distributeur 51 et un couvercle de distributeur 52, et un carter 6.  Throughout this text, will be referred to as hydraulic apparatus that can operate as a motor or hydraulic pump. As shown in FIGS. 1a and 1b, a hydraulic apparatus 1 comprises a shaft 2, a cam 3 typically a multilobe cam, a cylinder block 4, an ice or dispensing assembly 5 comprising a distributor 51 and a distributor cover 52, and a housing 6.
Le bloc cylindres 4 est placé à l'intérieur de l'anneau formant la came 3. The cylinder block 4 is placed inside the ring forming the cam 3.
Il définit une pluralité de cylindres 41 orientés radialement par rapport à 20 un axe X-X' de rotation (voir figures la et lb) et débouchant sur la face périphérique extérieure du bloc cylindres 4 en regard de la came 3.It defines a plurality of cylinders 41 oriented radially with respect to an axis X-X 'of rotation (see FIGS. 1a and 1b) and opening onto the outer peripheral face of the cylinder block 4 facing the cam 3.
Un piston 42 est monté à coulissement radial respectivement dans chacun des cylindres 41. Chaque piston 42 prend appui sur la surface radialement interne de la came 3. A piston 42 is mounted to slide radially respectively in each of the cylinders 41. Each piston 42 bears on the radially inner surface of the cam 3.
25 Le bloc cylindres 4 possède un alésage central par lequel il peut être engagé sur l'extrémité de l'arbre 2 de l'appareil hydraulique 1. The cylinder block 4 has a central bore through which it can be engaged on the end of the shaft 2 of the hydraulic apparatus 1.
La glace ou ensemble de distribution 50 est formée d'un distributeur 51 et d'un couvercle de distributeur 52 qui sont adaptés pour appliquer de 30 manière contrôlée un fluide sous pression successivement sur chacun des pistons 42, plus précisément dans la chambre interne des cylindres 41 adjacente aux pistons, de sorte que l'appui successif des pistons 42 sur les lobes de la came 3 entraîne la rotation relative du bloc cylindres 4 et des éléments qui lui sont liés par rapport à la came 3. Le distributeur 51 est mobile en rotation selon un axe colinéaire à X-X', qui est l'axe de l'arbre 2. The ice or dispensing assembly 50 is formed of a distributor 51 and a distributor cover 52 which are adapted to controllably apply a pressurized fluid successively to each of the pistons 42, more precisely to the internal chamber of the cylinders. 41 adjacent to the pistons, so that the successive support of the pistons 42 on the lobes of the cam 3 causes the relative rotation of the cylinder block 4 and elements which are linked to it with respect to the cam 3. The distributor 51 is rotatable along an axis collinear with X-X ', which is the axis of the shaft 2.
La glace ou ensemble de distribution 50 comprend notamment deux chambres 511, 521 et 512, 522 recevant un fluide sous haute ou basse pression selon le mode de fonctionnement de l'appareil.  The ice or dispensing assembly 50 includes two chambers 511, 521 and 512, 522 receiving a fluid under high or low pressure depending on the mode of operation of the apparatus.
On connaît les appareils hydrauliques présentant un mécanisme de débrayage et d'embrayage à poussée, permettant ainsi une configuration en roue libre, i.e. l'appareil hydraulique 1 fonctionne sans pression (les pistons 42 n'effectuant donc pas de mouvement de va et vient au contact de la came 3) et une configuration de travail, i.e. une configuration dans laquelle l'appareil hydraulique fonctionne avec une pression et un débit de fluide, les pistons 42 effectuant un mouvement de va et vient au contact de la came. Hydraulic devices are known having a disengagement mechanism and push clutch, thus allowing a freewheel configuration, ie the hydraulic apparatus 1 operates without pressure (the pistons 42 therefore do not move back and forth at contact of the cam 3) and a working configuration, ie a configuration in which the hydraulic apparatus operates with a pressure and a fluid flow rate, the pistons 42 reciprocating in contact with the cam.
Lors de l'embrayage, il est nécessaire d'engager le bloc cylindres 4 sur l'arbre 2 afin que ledit bloc 4 puisse transmettre son couple. Cet engagement se fait notamment par la glace ou ensemble de distribution 50. En outre, l'ensemble de distribution 50 alimente le bloc cylindres 4 en fluides sous pression. L'étanchéité entre ledit bloc cylindres 4 et ledit ensemble de distribution 50 est permise sans joint grâce à un contact permanent entre les deux. Pour transmettre du couple sans que l'embrayage ne patine, il est nécessaire d'avoir une poussée importante de l'ensemble de distribution 50 sur le bloc cylindres 4. Jusqu'à présent, cette poussée est exercée par les fluides sous pression dans les deux chambres 511, 521 et 512, 522 de l'ensemble de distribution 50, dites chambre à haute-pression et chambre à basse-pression selon le mode de fonctionnement de l'appareil. During clutching, it is necessary to engage the cylinder block 4 on the shaft 2 so that said block 4 can transmit its torque. This commitment is made in particular by the ice or distribution assembly 50. In addition, the dispensing assembly 50 supplies the cylinder block 4 with fluids under pressure. The seal between said cylinder block 4 and said dispensing assembly 50 is permitted without a seal thanks to a permanent contact between the two. To transmit torque without the clutch slipping, it is necessary to have a significant thrust of the distribution assembly 50 on the cylinder block 4. Up to now, this thrust is exerted by the fluids under pressure in the two chambers 511, 521 and 512, 522 of the distribution assembly 50, said high-pressure chamber and low-pressure chamber according to the operating mode of the apparatus.
Ainsi les fluides sous pression exercent sur le distributeur 51, via ces chambres 511, 521 et 512, 522 une force selon l'axe X-X' de l'arbre 2, le distributeur 51 alors vient se plaquer contre le bloc cylindres 4 et permettre ainsi au bloc cylindres 4 de s'engager sur l'arbre 2. La haute pression est comprise entre 400 et 500 bars typiquement. Plus précisément, les chambres 511, 521, et 512, 522 comprennent deux rainures 511 et 512 à l'interface entre le distributeur 51 et le couvercle 52 pour l'acheminement du fluide, qui coopèrent avec deux rainures complémentaire 521 et 522 aménagées dans le couvercle de distributeur 52 afin de former des chambres ou canaux. Selon le mode de fonctionnement de l'appareil hydraulique 1, chaque canal peut être basse ou haute pression et est adapté pour être respectivement relié à un circuit hydraulique d'alimentation 71, 72 (voir figures 3a et 3b). Chaque circuit peut être basse ou haute pression selon le mode de fonctionnement. Thus the fluids under pressure exert on the distributor 51, via these chambers 511, 521 and 512, 522 a force along the axis XX 'of the shaft 2, the distributor 51 then comes to press against the cylinder block 4 and thus allow the cylinder block 4 to engage the shaft 2. The high pressure is between 400 and 500 bar typically. More specifically, the chambers 511, 521, and 512, 522 comprise two grooves 511 and 512 at the interface between the distributor 51 and the cover 52 for conveying the fluid, which cooperate with two complementary grooves 521 and 522 arranged in the dispenser cover 52 to form chambers or channels. Depending on the mode of operation of the hydraulic apparatus 1, each channel may be low or high pressure and is adapted to be respectively connected to a hydraulic supply circuit 71, 72 (see Figures 3a and 3b). Each circuit can be low or high pressure depending on the mode of operation.
Les rainures 511 et 512 aménagées dans le distributeur 51 présentent chacune une paroi latérale sur le côté en direction du bloc cylindres 4 Ainsi, comme mentionné précédemment, l'alimentation en fluide sous basse ou haute pression va tendre à déplacer le distributeur 51 vers le bloc cylindres 4 sous l'effet de l'effort résultant de la pression appliquée à ces parois latérales. The grooves 511 and 512 made in the distributor 51 each have a lateral wall on the side in the direction of the cylinder block 4. As mentioned above, the supply of fluid under low or high pressure will tend to move the distributor 51 towards the block. cylinders 4 under the effect of the force resulting from the pressure applied to these side walls.
De cette façon, le niveau d'engagement du bloc cylindres 4 sur l'arbre 2 dépend directement de la pression, ladite pression étant elle-même corrélée au couple de l'appareil 1.  In this way, the level of engagement of the cylinder block 4 on the shaft 2 depends directly on the pressure, said pressure being itself correlated to the torque of the apparatus 1.
La pression appliquée pour engager le bloc cylindres 4 sur l'arbre 2 est donc non constante, ce qui n'est pas souhaitable pour un embrayage. En particulier au démarrage, afin d'obtenir un niveau d'engagement satisfaisant, il est nécessaire d'avoir une pression minimum assez élevée, ce qui implique de toutes façons un fort niveau de gavage, le gavage étant fourni par une pompe 9 dite pompe de gavage, qui assure une mise sous pression minimale des circuits hydrauliques 71, 72. La pression de gavage est de l'ordre de la basse pression, c'est-à-dire typiquement une dizaine de bars. The pressure applied to engage the cylinder block 4 on the shaft 2 is therefore not constant, which is not desirable for a clutch. In particular at startup, in order to obtain a satisfactory level of commitment, it is necessary to have a fairly high minimum pressure, which implies in any case a high level of feeding, the feeding is provided by a pump 9 said pump booster, which ensures a minimum pressurization of the hydraulic circuits 71, 72. The gavage pressure is of the order of the low pressure, that is to say typically about ten bars.
L'objectif est donc de fournir un nouveau dispositif permettant d'améliorer l'engagement du bloc cylindres 4 sur l'arbre 2. The objective is therefore to provide a new device for improving the engagement of the cylinder block 4 on the shaft 2.
PRESENTATION DE L'INVENTION PRESENTATION OF THE INVENTION
La présente invention vise à proposer un système ne présentant pas de tels inconvénients. The present invention aims to propose a system that does not have such disadvantages.
Pour cela, l'invention concerne un ensemble de distribution d'un appareil hydraulique à pistons radiaux, ledit appareil comprenant un bloc cylindres engageable sur un arbre par translation, ledit ensemble comprenant : For this, the invention relates to a dispensing assembly of a radial piston hydraulic apparatus, said apparatus comprising a cylinder block engageable on a shaft by translation, said assembly comprising:
Un distributeur, en contact avec ledit bloc cylindres,  A dispenser in contact with said cylinder block,
Un couvercle de distribution,  A dispensing lid,
Une première et une deuxième chambres définies respectivement par un premier et un deuxième volumes situés à l'interface entre ledit distributeur et ledit couvercle de distribution, et destinées aux fluides sous pression permettant la conversion mécanique-pression,  First and second chambers respectively defined by first and second volumes located at the interface between said distributor and said dispensing cover, and for pressurized fluids for mechanical-pressure conversion,
ledit ensemble étant caractérisée en ce qu'elle comprend en outre une section additionnelle définie par un troisième volume situé à l'interface entre ledit distributeur et ledit couvercle de distribution, ladite section étant destinée à recevoir un fluide sous pression pour permettre l'engagement du bloc cylindres sur l'arbre. said assembly being characterized in that it further comprises an additional section defined by a third volume located at the interface between said distributor and said dispensing cover, said section being intended to receive a fluid under pressure to allow the engagement of the cylinder block on the tree.
En outre, l'invention peut comprendre les caractéristiques suivantes, prises seules ou en combinaison : In addition, the invention may include the following features, taken alone or in combination:
- la section additionnelle se situe tout ou en partie radialement extérieurement aux première et deuxième chambres, de sorte que la surface de ladite section additionnelle est plus importante. l'alimentation de la section additionnelle se fait par sélection entre la plus basse pression entre les deux pressions relatives aux première et deuxième chambres. the additional section is wholly or partly radially outwardly to the first and second chambers, so that the surface of said additional section is larger. the supply of the additional section is made by selection between the lowest pressure between the two pressures relative to the first and second chambers.
l'ensemble de distribution comprend un sélecteur basse pression à centre ouvert adaptée pour effectuer la sélection entre la plus basse pression entre les deux pressions relatives aux première et deuxième chambres.  the dispensing assembly includes an open center low pressure selector adapted to select between the lower pressure between the two pressures relative to the first and second chambers.
la section additionnelle n'est pas rectiligne radialement, mais typiquement en S ou en Z, afin d'optimiser le volume et l'étanchéité.  the additional section is not rectilinear radially, but typically S or Z, to optimize the volume and tightness.
Un autre objet de l'invention concerne un appareil hydraulique comportant un ensemble de distribution tel que précédemment décrit, ledit ensemble permettant notamment l'engagement dudit bloc cylindres sur ledit arbre. Another object of the invention relates to a hydraulic apparatus comprising a distribution assembly as previously described, said assembly allowing in particular the engagement of said cylinder block on said shaft.
En outre, l'invention peut comprendre les caractéristiques suivantes, prises seules ou en combinaison : - le couvercle de distributeur et le carter sont solidaires ou forment une seule et même pièce. In addition, the invention may comprise the following features, taken alone or in combination: - the distributor cover and the housing are integral or form a single piece.
l'engagement du bloc cylindres sur l'arbre fait partie d'un système d'embrayage et de débrayage. Enfin, un dernier objet de l'invention concerne un procédé d'engagement d'un bloc cylindres d'un appareil hydraulique sur un arbre, à l'aide d'un ensemble de distribution précédemment décrit dans lequel :  the engagement of the cylinder block on the shaft is part of a clutch and disengagement system. Finally, a final subject of the invention concerns a method of engaging a cylinder block of a hydraulic apparatus on a shaft, using a previously described distribution assembly in which:
- La section additionnelle est mise sous pression par un fluide,  The additional section is pressurized by a fluid,
- Le distributeur est sollicité consécutivement à la mise sous pression par un fluide de la section additionnelle,  - The dispenser is solicited consecutively to the pressurization by a fluid of the additional section,
- Le distributeur sollicite par contact le bloc cylindres pour l'engagement dudit bloc cylindres sur l'arbre. PRESENTATION DES FIGURES - The distributor solicits by contact the cylinder block for the engagement of said cylinder block on the shaft. PRESENTATION OF FIGURES
D'autres caractéristiques, buts et avantages de l'invention ressortiront de la description qui suit, qui est purement illustrative et non limitative, et qui doit être lue en regard des dessins annexés, sur lesquels : Other characteristics, objects and advantages of the invention will emerge from the description which follows, which is purely illustrative and nonlimiting, and which should be read with reference to the appended drawings, in which:
- La figure la présente un schéma d'une vue partielle en coupe d'un appareil appartenant à l'état de l'art,  FIG. 1a is a diagram of a partial sectional view of a device belonging to the state of the art,
- la figure lb présente une vue en coupe d'un appareil hydraulique appartenant à l'état de l'art,  FIG. 1b shows a sectional view of a hydraulic apparatus belonging to the state of the art,
- la figure 2a présente un schéma d'une vue partielle en coupe d'une variante d'appareil hydraulique selon un aspect de l'invention,  FIG. 2a is a diagram of a partial sectional view of an alternative hydraulic apparatus according to one aspect of the invention,
- la figure 2b présente une vue en coupe d'un appareil hydraulique conforme à l'invention,  FIG. 2b shows a sectional view of a hydraulic apparatus according to the invention,
- les figures 3a et 3b présentent deux vues d'un exemple d'intégration d'une variante d'appareil hydraulique selon un aspect de l'invention sur un essieu de véhicule,  FIGS. 3a and 3b show two views of an example of integration of a variant of hydraulic apparatus according to one aspect of the invention on a vehicle axle,
Sur l'ensemble des figures, les éléments communs sont repérés par des références numériques identiques. DESCRIPTION DETAILLEE D'AU MOINS UN MODE DE REALISATION In all the figures, the common elements are identified by identical reference numerals. DETAILED DESCRIPTION OF AT LEAST ONE EMBODIMENT
La figure 2a présente une vue partielle en coupe d'un appareil hydraulique et d'un ensemble de distribution selon un mode de réalisation de l'invention. Comme pour les figures la et lb, l'axe de rotation X-X' de l'appareil hydraulique et un axe Y-Y' d'extension radiale sont représentées sur les figures 2a et 2b. Figure 2a shows a partial sectional view of a hydraulic apparatus and a dispensing assembly according to one embodiment of the invention. As for Figures 1a and 1b, the axis of rotation X-X 'of the hydraulic apparatus and a Y-axis Y' of radial extension are shown in Figures 2a and 2b.
Les éléments communs avec l'état de l'art précédemment décrit présentent les mêmes dénominations et références alphanumériques. Le fonctionnement global de l'appareil hydraulique a été largement décrit, entre autres, dans les documents FR 2955903 Al et FR 2651836 Al . Comme mentionné précédemment, l'un des modes de réalisation du système d'embrayage consiste à engager par translation le bloc cylindres 4 sur l'arbre 2. The elements common with the state of the art previously described have the same names and alphanumeric references. The overall operation of the hydraulic apparatus has been widely described, inter alia, in FR 2955903 A1 and FR 2651836 A1. As mentioned above, one of the embodiments of the clutch system consists in translational engagement of the cylinder block 4 on the shaft 2.
On définit un plan de distribution 53 entre le distributeur 51 et le bloc cylindres 4, correspondant aux faces du distributeur 51 et du bloc cylindres 4 adaptées pour être mises en contact l'une de l'autre. A distribution plane 53 is defined between the distributor 51 and the cylinder block 4, corresponding to the faces of the distributor 51 and the cylinder block 4 adapted to be brought into contact with one another.
En outre, l'étanchéité est assurée par la configuration particulière des rainures 511 et 512 qui assure un auto-maintien entre le bloc cylindres 4 le distributeur 51. In addition, the sealing is ensured by the particular configuration of the grooves 511 and 512 which ensures a self-maintenance between the cylinder block 4 the distributor 51.
Le couvercle de distributeur 52 est typiquement fixe et solidaire du carter 6 et notamment fixe en translation selon l'axe X-X'. Alternativement, le couvercle de distributeur 52 peut former une seule et même pièce avec le carter 6. Une section additionnelle 54 est ajoutée entre le distributeur 51 et le couvercle 52. Cette section additionnelle 54 est un volume dans lequel un fluide sous pression peut circuler. Une première paroi interne 541 de ladite section additionnelle est constituée par le distributeur 51 et une deuxième paroi interne 542 est constituée par le couvercle 52. The distributor cover 52 is typically fixed and integral with the casing 6 and in particular fixed in translation along the axis X-X '. Alternatively, the dispenser cover 52 may form a single piece with the casing 6. An additional section 54 is added between the dispenser 51 and the cover 52. This additional section 54 is a volume in which a fluid under pressure can circulate. A first inner wall 541 of said additional section is constituted by the distributor 51 and a second inner wall 542 is constituted by the cover 52.
D'une façon largement préférentielle, la surface de la première paroi 541 est sensiblement perpendiculaire à l'arbre 2 et est la plus importante possible. In a largely preferred manner, the surface of the first wall 541 is substantially perpendicular to the shaft 2 and is the largest possible.
La section additionnelle 54 est préférablement située tout ou en partie radialement à l'extérieur des canaux 511, 521 et 512, 522 selon l'axe Y- Y'. En effet, l'ensemble étant globalement cylindrique de révolution autour de l'axe X-X', plus la section additionnelle 54 se situe à l'extérieur radialement, plus la surface de la première paroi 541 de la section additionnelle 54 peut être importante. Préférablement, la section additionnelle est préférablement longitudinalement située entre le bloc cylindres 4 et les deux chambres 511, 521, 512, 522. The additional section 54 is preferably located wholly or partly radially outwardly of the channels 511, 521 and 512, 522 along the Y-Y 'axis. Indeed, since the assembly is generally cylindrical in revolution about the axis X-X ', the further the additional section 54 is located radially, the greater the area of the first wall 541 of the additional section 54 may be important . Preferably, the additional section is preferably longitudinally located between the cylinder block 4 and the two chambers 511, 521, 512, 522.
Des moyens d'étanchéité 543 sont aussi prévus, tels que des joints d'étanchéité, pour étanchéifier la section additionnelle 54 destiné à recevoir un fluide sous pression.  Sealing means 543 are also provided, such as seals, for sealing the additional section 54 for receiving a fluid under pressure.
Selon un mode de réalisation préférée, la section additionnelle 54 est en forme de S ou de Z. Une telle forme permet d'optimiser le gain de volume et permet de loger des joints d'étanchéité 543 par coulissement axial. Alternativement, la section additionnelle 54 est rectiligne. According to a preferred embodiment, the additional section 54 is S-shaped or Z-shaped. Such a shape makes it possible to optimize the volume gain and makes it possible to house gaskets 543 by axial sliding. Alternatively, the additional section 54 is rectilinear.
La section additionnelle 54 est destinée à être alimentée par un fluide sous pression via un canal d'alimentation 55 positionné dans le couvercle de distributeur. Grâce à la surface de la première paroi 541, le fluide sous pression exerce une force colinéaire à l'axe X-X' sur le distributeur 51. Le distributeur 51 étant en contact avec le bloc cylindre 4 par la surface de contact 53, la force est transmise au bloc cylindre 4 qui vient s'engager sur l'arbre 2. The additional section 54 is intended to be supplied with a pressurized fluid via a feed channel 55 positioned in the dispenser cover. Thanks to the surface of the first wall 541, the pressurized fluid exerts a collinear force to the axis XX 'on the distributor 51. The distributor 51 being in contact with the cylinder block 4 by the contact surface 53, the force is transmitted to the cylinder block 4 which engages on the shaft 2.
La force induite par le fluide sous pression sur le distributeur 51, indirectement sur le bloc cylindre 4, étant proportionnelle à la surface de la première paroi 541, la maximisation de cette surface permet la minimisation de la pression du fluide, à force constante. Selon un premier mode de réalisation (figure 2b et 3a), la section additionnelle est alimentée par la plus basse pression des deux circuits hydrauliques d'alimentation 71, 72. Comme mentionné précédemment, les deux circuits hydrauliques 71, 72 peuvent être basse ou haute pression en fonction du mode de fonctionnement de l'appareil hydraulique 1. Les deux circuits hydrauliques d'alimentation 71, 72 sont reliés à un sélecteur 9, ledit sélecteur 9 étant relié à la section additionnelle 54 via le canal d'alimentation 55. Le sélecteur 9 est adapté pour sélectionner la plus basse pression entre les deux circuits hydrauliques d'alimentation 71, 72. Les entrées du sélecteur 9 sont connectées aux deux circuits hydrauliques 71, 72 pouvant être chacun haute et basse pression. La sortie du sélecteur 9 est connectée au canal d'alimentation 55. The force induced by the fluid under pressure on the distributor 51, indirectly on the cylinder block 4, being proportional to the surface of the first wall 541, the maximization of this surface allows the minimization of the pressure of the fluid, with constant force. According to a first embodiment (FIGS. 2b and 3a), the additional section is fed by the lower pressure of the two hydraulic supply circuits 71, 72. As mentioned above, the two hydraulic circuits 71, 72 can be low or high. depending on the operating mode of the hydraulic apparatus 1. The two hydraulic supply circuits 71, 72 are connected to a selector 9, said selector 9 being connected to the additional section 54 via the supply channel 55. selector 9 is adapted to select the lowest pressure between the two circuits hydraulic feed 71, 72. The inputs of the selector 9 are connected to the two hydraulic circuits 71, 72 which can each be high and low pressure. The output of the selector 9 is connected to the supply channel 55.
De façon préférentielle, le sélecteur 9 est un sélecteur à centre ouvert : en effet, en particulier au démarrage de l'appareil hydraulique, les deux circuits hydrauliques 71, 72 sont mis à une pression de gavage par la pompe 7 dite pompe de gavage, représentée schématiquement (figures 3a et 3b) comme une pompe hydraulique. Les pressions dans les deux circuits hydrauliques 71, 72 étant à ce moment-là quasi-équivalentes, le sélecteur 9 à centre ouvert permettra l'alimentation de la section additionnelle 54 dès le démarrage de l'appareil hydraulique 1. Preferably, the selector 9 is an open-center selector: in fact, in particular at the start of the hydraulic apparatus, the two hydraulic circuits 71, 72 are put to a feeding pressure by the pump 7 called the booster pump, shown schematically (Figures 3a and 3b) as a hydraulic pump. The pressures in the two hydraulic circuits 71, 72 being at this time almost equivalent, the selector 9 open center will supply the additional section 54 from the start of the hydraulic device 1.
Le canal d'alimentation 55 relie le sélecteur 9 à la section additionnelle 54. Pour des raisons d'encombrement, ledit canal d'alimentation 55 se situe avantageusement tout ou partie au moins dans un autre plan que la section additionnelle 54 (canal d'alimentation 55 représenté en pointillé sur la figure 2b). The supply duct 55 connects the selector 9 to the additional section 54. For reasons of space, said supply duct 55 is advantageously all or part at least in another plane than the additional section 54 (duct). supply 55 shown in dashed lines in Figure 2b).
Selon un second mode de réalisation (figure 3b), la section additionnelle 54 est directement alimentée par la pompe de gavage 7 via le canal d'alimentation 55. According to a second embodiment (FIG. 3b), the additional section 54 is directly supplied by the booster pump 7 via the supply channel 55.
Les appareils hydrauliques 1 concernés sont typiquement à pistons 42 radiaux et à came 3 multilobe. En particulier, lorsque l'appareil 1 est en configuration roue libre, les pistons 42 sont maintenus au contact de la came 3 par des ressorts de poussée. The hydraulic devices 1 concerned are typically radial pistons 42 and multilobe cam 3. In particular, when the apparatus 1 is in freewheel configuration, the pistons 42 are kept in contact with the cam 3 by thrust springs.

Claims

Revendications  claims
Ensemble de distribution (50) d'un appareil hydraulique (1) à pistons radiaux, ledit appareil comprenant un bloc cylindres (4) engageable sur un arbre (2) par translation, ledit ensemble (50) comprenant : Distribution assembly (50) of a hydraulic apparatus (1) with radial pistons, said apparatus comprising a cylinder block (4) engageable on a shaft (2) by translation, said assembly (50) comprising:
- Un distributeur (51), en contact avec ledit bloc cylindres (4),  - A distributor (51) in contact with said cylinder block (4),
- Un couvercle de distribution (52),  - a distribution cover (52),
- Une première (541) et une deuxième (542) chambres définies respectivement par un premier (511, 521) et un deuxième (512, 522) volumes situés à l'interface entre ledit distributeur (51) et ledit couvercle de distribution (52), et destinées aux fluides sous pression permettant la conversion mécanique-pression,  A first (541) and a second (542) chamber respectively defined by a first (511, 521) and a second (512, 522) volume located at the interface between said distributor (51) and said distribution cover (52); ), and intended for pressurized fluids for mechanical-pressure conversion,
ledit ensemble (50) étant caractérisée en ce qu'il comprend une section additionnelle (54) définie par un troisième volume (541, 542) situé à l'interface entre ledit distributeur (51) et ledit couvercle de distribution (52), ladite section (54) étant destinée à recevoir un fluide sous pression pour permettre l'engagement du bloc cylindres (4) sur l'arbre (2).  said assembly (50) being characterized in that it comprises an additional section (54) defined by a third volume (541, 542) located at the interface between said distributor (51) and said dispensing cover (52), said section (54) being intended to receive a fluid under pressure to allow engagement of the cylinder block (4) on the shaft (2).
Ensemble de distribution (50) selon la revendication 1, dans lequel la section additionnelle (54) se situe tout ou en partie radialement extérieurement aux première (511, 521) et deuxième (512, 522) chambres, de sorte que la surface de ladite section additionnelle (54) est plus importante. A dispensing assembly (50) according to claim 1, wherein the additional section (54) is wholly or partly radially outwardly to the first (511, 521) and second (512, 522) chambers, so that the surface of said additional section (54) is more important.
Ensemble de distribution (50) selon l'une des revendications 1 à 2, dans lequel l'alimentation de la section additionnelle (54) se fait par sélection entre la plus basse pression entre les deux pressions relatives aux première (511, 521) et deuxième (512, 522) chambres. Ensemble de distribution (50) selon la revendication précédente, dans lequel l'ensemble de distribution comprend un sélecteur (9) basse pression à centre ouvert adaptée pour effectuer la sélection entre la plus basse pression entre les deux pressions relatives aux première (511, 521) et deuxième (512, 522) chambres. Dispensing assembly (50) according to one of claims 1 to 2, wherein the supply of the additional section (54) is made by selection between the lowest pressure between the two pressures relative to the first (511, 521) and second (512, 522) rooms. Dispensing assembly (50) according to the preceding claim, wherein the dispensing assembly comprises a selector (9) low pressure open center adapted to make the selection between the lowest pressure between the two pressures relative to the first (511, 521 ) and second (512, 522) rooms.
5. Ensemble de distribution (50) selon l'une des revendications précédentes, dans lequel la section additionnelle (54) n'est pas rectiligne radialement, mais typiquement en S ou en Z, afin d'optimiser le volume et l'étanchéité. 5. Dispensing assembly (50) according to one of the preceding claims, wherein the additional section (54) is not rectilinear radially, but typically S or Z, to optimize the volume and sealing.
6. Appareil hydraulique (1) comportant un carter (6), un bloc cylindres (4) et un arbre (2) sur lequel le bloc cylindres (4) est adapté pour s'engager par translation longitudinale, caractérisé en ce qu'il comprend en outre un ensemble (50) conforme à l'une des revendications précédentes, ledit ensemble (50) permettant notamment l'engagement dudit bloc cylindres (4) sur ledit arbre (2). Hydraulic apparatus (1) comprising a housing (6), a cylinder block (4) and a shaft (2) on which the cylinder block (4) is adapted to engage by longitudinal translation, characterized in that further comprises an assembly (50) according to one of the preceding claims, said assembly (50) including the engagement of said cylinder block (4) on said shaft (2).
7. Appareil hydraulique (1) selon la revendication précédente, dans lequel le couvercle de distributeur (52) et le carter (6) sont solidaires ou forment une seule et même pièce. 8. Appareil hydraulique (1) selon la revendication précédente, dans lequel l'engagement du bloc cylindres (4) sur l'arbre (2) fait partie d'un système d'embrayage et de débrayage. 7. Hydraulic apparatus (1) according to the preceding claim, wherein the distributor cover (52) and the housing (6) are integral or form a single piece. 8. hydraulic apparatus (1) according to the preceding claim, wherein the engagement of the cylinder block (4) on the shaft (2) is part of a clutch system and disengagement.
9. Appareil hydraulique (1) selon l'une des revendications 6 à 8, dans lequel l'appareil (1) est à pistons (42) radiaux et à came (3) multilobe. 9. Hydraulic apparatus (1) according to one of claims 6 to 8, wherein the apparatus (1) is radial pistons (42) and cam (3) multilobe.
10. Appareil hydraulique (1) selon la revendication précédente, dans lequel les pistons (42) sont maintenus au contact de la came (3) par des ressorts de poussée. 10. Hydraulic apparatus (1) according to the preceding claim, wherein the pistons (42) are held in contact with the cam (3) by thrust springs.
11. Procédé d'engagement d'un bloc cylindres (4) d'un appareil hydraulique (1) sur un arbre (2), à l'aide d'un ensemble de distribution selon l'une quelconque des revendications 1 à 8, dans lequel : 11. A method of engaging a cylinder block (4) of a hydraulic apparatus (1) on a shaft (2), using a dispensing assembly according to any one of claims 1 to 8, in which :
a. La section additionnelle (54) est mise sous pression par un fluide,  at. The additional section (54) is pressurized by a fluid,
b. Le distributeur (51) est sollicité consécutivement à la mise sous pression par un fluide de la section additionnelle (54), c. Le distributeur (51) sollicite par contact le bloc cylindres (4) pour l'engagement dudit bloc cylindres (4) sur l'arbre (2).  b. The distributor (51) is urged consecutively upon the pressurization by a fluid of the additional section (54), c. The distributor (51) urges by contact the cylinder block (4) for the engagement of said cylinder block (4) on the shaft (2).
EP15713886.8A 2014-04-02 2015-04-01 Hydraulic apparatus having an additional thrust section Active EP3126669B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1452924A FR3019594B1 (en) 2014-04-02 2014-04-02 ADDITIONAL SECTION OF PUSH
PCT/EP2015/057182 WO2015150456A1 (en) 2014-04-02 2015-04-01 Hydraulic apparatus having an additional thrust section

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EP3126669A1 true EP3126669A1 (en) 2017-02-08
EP3126669B1 EP3126669B1 (en) 2019-08-21

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EP (1) EP3126669B1 (en)
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WO (1) WO2015150456A1 (en)

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Publication number Priority date Publication date Assignee Title
FR3045734B1 (en) 2015-12-21 2020-01-03 Poclain Hydraulics Industrie HYDRAULIC MACHINE WITH RADIAL PISTONS INCLUDING A CLUTCH ACTIVATION SPRING
FR3050773B1 (en) 2016-04-28 2018-05-11 Poclain Hydraulics Industrie DEGRASABLE HYDRAULIC MACHINE AND VEHICLE EQUIPPED WITH SUCH A MACHINE

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Publication number Priority date Publication date Assignee Title
FR2611816B1 (en) * 1987-02-25 1989-07-13 Poclain Hydraulics Sa MULTI-CYLINDER PRESSURE FLUID MECHANISM, MOTOR OR PUMP
FR2651836B1 (en) * 1989-09-14 1994-06-10 Poclain Hydraulics Sa MECHANISM, MOTOR OR PUMP, WITH PISTONS SUPPORTING ROLLERS FOR SUPPORTING SAID PISTONS ON A CAM.
FR2892775B1 (en) * 2005-10-27 2010-11-05 Poclain Hydraulics Ind HYDRAULIC MOTOR WITH RADIAL PISTONS WITH COOLING OF THE CYLINDER BLOCK
FR2955903B1 (en) * 2010-02-01 2012-03-16 Poclain Hydraulics Ind HYDROBASE-FORMING SUBASSEMBLY FOR HYDRAULIC ENGINES AND METHOD OF ASSEMBLY

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US20170022965A1 (en) 2017-01-26
EP3126669B1 (en) 2019-08-21
FR3019594B1 (en) 2016-04-08
FR3019594A1 (en) 2015-10-09
WO2015150456A1 (en) 2015-10-08

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