EP0205368B1 - Hydraulic mechanism, engine or pump with rollers mounted on the pistons and with means for keeping these rollers in position - Google Patents

Hydraulic mechanism, engine or pump with rollers mounted on the pistons and with means for keeping these rollers in position Download PDF

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Publication number
EP0205368B1
EP0205368B1 EP86401030A EP86401030A EP0205368B1 EP 0205368 B1 EP0205368 B1 EP 0205368B1 EP 86401030 A EP86401030 A EP 86401030A EP 86401030 A EP86401030 A EP 86401030A EP 0205368 B1 EP0205368 B1 EP 0205368B1
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EP
European Patent Office
Prior art keywords
face
cylinder
roller
abutment
piston
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.)
Expired
Application number
EP86401030A
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German (de)
French (fr)
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EP0205368A1 (en
Inventor
Alain William Noel
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 France SA
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Poclain Hydraulics France SA
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Publication of EP0205368A1 publication Critical patent/EP0205368A1/en
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Expired legal-status Critical Current

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    • 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
    • F04B1/107—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 outer ends of the cylinders
    • F04B1/1071—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 outer 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
    • 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
    • F04B1/0404—Details or component parts
    • F04B1/0408—Pistons
    • 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
    • F04B1/0404—Details or component parts
    • F04B1/0439—Supporting or guiding means for the pistons

Definitions

  • Hydraulic mechanism motor or pump, provided with rollers mounted on the pistons and means for holding said rollers in position.
  • a hydraulic mechanism, motor or pump comprising a cam, a cylinder block rotatably mounted relative to the cam, a plurality of cylinders formed in this cylinder block, a plurality of pistons mounted, each, sliding inside a cylinder along a sliding axis (of the piston), a plurality of bearing rollers supporting the pistons on the cam, each roller being mounted on a piston, rotating about a roller axis perpendicular to the sliding axis of said piston by means of a rotation bearing, being axially delimited by two substantially transverse end faces substantially planar and parallel, and being susceptible to penetrate, at least partially, inside the cylinder in which this piston is slidably mounted, the end of said piston, in which is formed said roller rotation bearing, further comprising two recesses which are delimited by two facessubstantially flat, parallel, and means for holding the rollers in position in their respective bearings, made integral with the cylinder block and preventing any
  • a kind of yoke is put in place at the upper part of each cylinder and has a central opening to allow the roller located at the upper part of the piston mounted in the cylinder to pass.
  • This arrangement seems unsuitable for embodiments having two rows of cylinders, arranged side by side, and, in general, for the innumerable variants which can be designed, such as those in which the roller is not arranged symmetrically with respect to the plane. containing the axes of the various cylinders of a row.
  • FR-A 2 160 120 for the sole means of holding integral with the cylinder block, it is known to produce rings which are intended to be placed in grooves provided in the cylinder block on each side of each row of cylinders and attached to it.
  • the corresponding machining is important and costly, and the installation sometimes delicate.
  • the invention intends to remedy these drawbacks and, starting from the first prior art cited (yoke placed at the top of each cylinder), has for this purpose, in a mechanism as defined above, a provision in which the means for holding in position of a roller are constituted by two sets independent of each other, each comprising an axial stop limiting the sliding of the roller parallel to the roller axis, defined by a support d 'a substantially flat surface, this support which.
  • a cylindrical roller or roller 23 is housed in a bearing 24 formed at the end of each piston 11, is rotatably mounted around a roller axis 25 orthogonal to the piston axis 26 of said piston and is supported on the cam 3.
  • This roller 23 is capable of penetrating, at least partially inside the cylinder: the width of the bearing 24 is slightly less than the length of the roller 23, so that, on the side of each transverse face 27 delimiting the roller, a recess 28 is formed in the part of the piston 11 which supports this roller, which makes it possible to form, on either side of said roller, free spaces 29.
  • the roller 23 has a length which is approximately one millimeter greater than the width of the bearing 24 and therefore protrudes slightly from each end of said bearing.
  • the plane P, perpendicular to the axis 25 of the roller 23 and containing l axis 26 of the piston is a plane of symmetry for the piston 11, the bearing 24, the roller 23, and the two spaces 29. It would also be possible, and in accordance with the invention, to have an asymmetrical arrangement in which the spaces 29 would not be symmetrical to each other with respect to a plane perpendicular to the axis 25 of the roller.
  • a groove 30 is formed in the outer face 31 of each side wall 32 transversely delimiting the cylinder block 8, and has a bottom 33 of groove, and a face 34 oriented in the direction opposite to that L towards which the cylinder 10 opens and located at a distance D from the upper face 35 of the cylinder block, into which the cylinder opens 10.
  • U-shaped jumpers each comprise a first branch 36 and a second branch 37 connected by a bar 38, each overlap one of said side walls 32.
  • the first branch 36 has its internal face 39 delimited in width by two edges 40 which are parallel to the axis 26 of the piston 11 and which are resting on two generatrices of the cylindrical inner surface (10) of the cylinder 10, and, with its external face 41 disposed opposite and near one of the transverse sections 27 of the roller 23 and thus constituting a stop for limiting any sliding of roller 23 with respect to its axis 25.
  • the internal face 42 of the bar 38 of the U-shaped rider bears on the upper face 35 of the cylinder block.
  • the second branch 37 of the U has its internal face 43 bearing on the external face 31 of the wall 32 of the cylinder block and at its end ending in a fallen edge, one face 44 of which is parallel to the face 34 of the groove 30 and is supported on this face 34 and whose extreme rectilinear edge 45 is arranged parallel to, and near the bottom 33 of the groove.
  • the establishment of these two U-shaped jumpers leads to their immobilization with respect to the cylinder block 8. In fact, parallel to the axis 26 of the piston 11, each jumper can neither descend, since it is supported by its face 42 on the upper face 35 of the cylinder block, or go up, because the face 44 of its fallen edge is supported on the face 34 of the groove 30.
  • the edges 40 are supported on the internal face (10) of the cylinder, and the internal face 43 of the second branch is supported on the external face 31 of the wall 32.
  • the support of the face 43 of the branch 37 on the face 31 of the wall 32 of the cylinder block prohibits any significant rotation of the rider around the axis 26 of the piston 11.
  • the faces 41 of the two riders are held in position facing the transverse sections 27 of the roller, which, by this means, is correctly maintained in position, both axially (parallel to its axis 25), and in angular orientation (relative to axis 26 of the piston).
  • the bearing 24 circumferentially surrounds the corresponding roller 23 by an arc of a circle greater than 180 ° .
  • a kind of lunula 46 occupies part of this space. It is delimited, in particular, by a cylindrical face 47, which is in abutment on the internal cylindrical face (10) of the cylinder, and by a planar face 48 disposed parallel to a transverse face 27 of the roller 23, near and opposite this face 27.
  • the lunula 46 has a tapped hole 49, capable of being disposed opposite a through hole 50, which is provided with each side wall 32 of the cylinder block.
  • a screw 51, passing through the hole 50, has a thread 52 capable of cooperating with the internal thread 49 to immobilize the lunula relative to the cylinder 10.
  • the flat faces 48 of the lunules 46 constitute stops for immobilizing the roller 23 in the direction of sliding parallel to its axis 25 and in angular orientation relative to the axis 26 of the piston 11.
  • FIG. 7 An alternative embodiment of FIGS. 5 and 6 is shown in FIG. 7.
  • each lunula has a cavity 53, which opens into its cylindrical face, is capable of entirely containing a spring 54 and a sliding pin 55, which the spring 54 tends to push out of the box 53
  • the lunula has its cavity 53 arranged opposite a housing 56 formed in the side wall 32 of the cylinder block, opening into the internal cylindrical face (10) of the cylinder and capable of receiving part of the pin 55.
  • the lunula is put in place so as to have facing one another, the cavity 53 and the housing 56, the pin 55 slides outwards of the cavity 53, pushed by the spring 54, and, penetrating into the housing 56, immobilizes the lunula 46 relative to the cylinder block.
  • a hole 57 carries out the passage of a rod to push the pin out of the housing 56, in order to allow the subsequent disassembly of the lunulas.
  • two lunules 46 are provided, the flat face 48 of each of which has in its central zone a housing 58 of the first branch 59 of a U-shaped jumper.
  • This branch 59 ends with a first fallen edge 60, which is spaced from the internal face 42 of the bar 38 of the U, a distance equal to the height of a lunula.
  • the second branch 37 of the U ends in a second fallen edge delimited by a flat face 44, which bears on the upper face 34 with a groove 30 which is provided on the outer face 31 of the wall 32, when the internal face 42 of the U-bar is supported on the upper face 35 of the wall 32 of the cylinder block, and by a straight edge 45 which is supported on the bottom 33 of the groove 30. It is understood that each lunula 46 is thus immobilized relative to the cylinder block, by means of this U-shaped jumper.
  • Each of the embodiments described therefore allows the establishment of planar, or substantially planar, faces 41, 48, for holding the roller 23 in its bearing 24, this in all the positions that the piston 11 can occupy (see in FIG. 4, in broken lines, the two extreme positions which the transverse faces of the roller 23 can occupy.

Description

Mécanisme hydraulique, moteur ou pompe, muni de rouleaux montés sur les pistons et de moyens de maintien en position desdits rouleaux.Hydraulic mechanism, motor or pump, provided with rollers mounted on the pistons and means for holding said rollers in position.

On connaît déjà, par exemple par FR-A 2 160 120 (figures 4, 5 et 6), un mécanisme hydraulique, moteur ou pompe, comprenant une came, un bloc-cylindres monté rotatif par rapport à la came, une pluralité de cylindres ménagés dans ce bloc-cylindres, une pluralité de pistons montés, chacun, à coulissement à l'intérieur d'un cylindre suivant un axe de coulissement (du piston), une pluralité de rouleaux d'appui de roulement des pistons sur la came, chaque rouleau étant monté sur un piston, rotatif autour d'un axe de rouleau perpendiculaire à l'axe de coulissement dudit piston au moyen d'un palier de rotation, étant délimité axialement par deux faces transversales extrêmes sensiblement planes et parallèles, et étant susceptible de pénétrer, au moins partiellement, à l'intérieur du cylindre dans lequel ce piston est monté à coulissement, l'extrémité dudit piston, dans laquelle est ménagé ledit palier de rotation du rouleau, comportant en outre deux évidements qui sont délimités par deux faces sensiblement planes, parallèles, et des moyens de maintien en position des rouleaux dans leurs paliers respectifs, rendus solidaires du bloc-cylindres et interdisant tout échappement de chaque rouleau hors de son palier par coulissement suivant la direction de l'axe de rouleau dudit rouleau, cependant que, le bloc-cylindres comprenant au moins une rangée de cylindres dont les axes sont contenus sensiblement dans un même plan transversal perpendiculaire à l'axe de rotation du bloc-cylindres par rapport à la came et sont disposés radialement, les moyens de maintien en position de deux quelconques rouleaux, correspondant à deux cylindres successifs appartenant à une même rangée de cylindres, sont constitués par des pièces distinctes l'une de l'autre.Already known, for example from FR-A 2 160 120 (Figures 4, 5 and 6), a hydraulic mechanism, motor or pump, comprising a cam, a cylinder block rotatably mounted relative to the cam, a plurality of cylinders formed in this cylinder block, a plurality of pistons mounted, each, sliding inside a cylinder along a sliding axis (of the piston), a plurality of bearing rollers supporting the pistons on the cam, each roller being mounted on a piston, rotating about a roller axis perpendicular to the sliding axis of said piston by means of a rotation bearing, being axially delimited by two substantially transverse end faces substantially planar and parallel, and being susceptible to penetrate, at least partially, inside the cylinder in which this piston is slidably mounted, the end of said piston, in which is formed said roller rotation bearing, further comprising two recesses which are delimited by two facessubstantially flat, parallel, and means for holding the rollers in position in their respective bearings, made integral with the cylinder block and preventing any escape of each roller out of its bearing by sliding in the direction of the roller axis of said roller, however that, the cylinder block comprising at least one row of cylinders whose axes are contained substantially in the same transverse plane perpendicular to the axis of rotation of the cylinder block with respect to the cam and are arranged radially, the holding means in position of any two rollers, corresponding to two successive cylinders belonging to the same row of cylinders, are constituted by separate parts from each other.

Selon cette réalisation connue, une sorte de chape est mise en place à la partie supérieure de chaque cylindre et possède une ouverture centrale pour laisser passer le rouleau situé à la partie supérieure du piston monté dans le cylindre. Cette disposition parait inadaptée aux réalisations possédant deux rangées de cylindres, disposées côte à côte, et, d'une manière générale, aux innombrables variantes qui peuvent être conçues, telles que celles dans lesquelles le rouleau n'est pas disposé symétriquement par rapport au plan contenant les axes des divers cylindres d'une rangée.According to this known embodiment, a kind of yoke is put in place at the upper part of each cylinder and has a central opening to allow the roller located at the upper part of the piston mounted in the cylinder to pass. This arrangement seems unsuitable for embodiments having two rows of cylinders, arranged side by side, and, in general, for the innumerable variants which can be designed, such as those in which the roller is not arranged symmetrically with respect to the plane. containing the axes of the various cylinders of a row.

Selon une autre réalisation connue, également notamment par FR-A 2 160 120 (figures 1 et 2), pour les seuls moyens de maintien solidaires du bloc-cylindres, on sait réaliser des anneaux qui sont destinés à être disposés dans des gorges prévues dans le bloc-cylindres, de chaque côté de chaque rangée de cylindres et qui y sont fixés. L'usinage correspondant est important et coûteux, et la mise en place parfois délicate.According to another known embodiment, also in particular by FR-A 2 160 120 (FIGS. 1 and 2), for the sole means of holding integral with the cylinder block, it is known to produce rings which are intended to be placed in grooves provided in the cylinder block on each side of each row of cylinders and attached to it. The corresponding machining is important and costly, and the installation sometimes delicate.

Les moyens connus de maintien en position des rouleaux, ou bien ne sont pas très facilement utilisables, ou bien présentent une certaine inadaptation par rapport à l'application qui devrait en être faite.The known means for holding the rollers in position, either are not very easy to use, or else have a certain inadequacy with respect to the application which should be made of them.

L'invention entend remédier à ces inconvénients et, partant du premier art antérieur cité (chape mise en place à la partie supérieure de chaque cylindre), a, à cet effet, pour objet, dans un mécanisme tel que précédemment défini, une disposition dans laquelle les moyens de maintien en position d'un rouleau sont constitués par deux ensembles indépendants l'un de l'autre comprenant, chacun, une butée axiale de limitation du coulissement du rouleau parallèlement à l'axe de rouleau, définie par un support d'une surface sensiblement plane, ce support qui. dans la direction de l'axe de rouleau, prend appui sur la partie de la face intérieure du cylindre correspondant située dans la zone de débattement d'un des deux évidements que comporte le piston, qui est maintenu en appui sur ladite surface intérieure du cylindre par un moyen de retenue radiale, qui est maintenu en position suivant la direction de l'axe de coulissement du piston par un moyen de fixation axiale, dont l'orientation radiale par rapport au cylindre est rendue sensiblement constante par un moyen de maintien de l'orientation, et, qui supporte effectivement une surface sensiblement plane formant butée axiale de limitation du coulissement du rouleau, parallèle aux surfaces transversales extrêmes du rouleau et aux faces sensiblement planes des deux évidements du piston et est disposée en regard de, et à proximité immédiate de ladite face d'un évidements et/ou du rouleau, celle desdites faces qui est la plus proche de cette face formant butée axiale selon que la longueur du rouleau est inférieure, égale ou supérieure à celle de son palier.The invention intends to remedy these drawbacks and, starting from the first prior art cited (yoke placed at the top of each cylinder), has for this purpose, in a mechanism as defined above, a provision in which the means for holding in position of a roller are constituted by two sets independent of each other, each comprising an axial stop limiting the sliding of the roller parallel to the roller axis, defined by a support d 'a substantially flat surface, this support which. in the direction of the roller axis, bears on the part of the inner face of the corresponding cylinder located in the clearance zone of one of the two recesses that the piston has, which is held in abutment on said inner surface of the cylinder by a radial retaining means, which is held in position along the direction of the axis of sliding of the piston by an axial fixing means, the radial orientation of which relative to the cylinder is made substantially constant by a means for maintaining the orientation, and, which effectively supports a substantially planar surface forming an axial abutment for limiting the sliding of the roller, parallel to the extreme transverse surfaces of the roller and to the substantially planar faces of the two recesses of the piston and is arranged opposite, and in the immediate vicinity of said face of a recesses and / or of the roller, that of said faces which is closest to this face forming an axial stop depending on whether the length of the rou the water is less, equal or greater than that of its bearing.

Diverses variantes de réalisation sont avantageuses, parmi lesquelles les suivants sont souvent préférées:

  • - dans la première variante de réalisation, un ensemble des moyens de maintien en position d'un rouleau est constitué par une rainure du bloc-cylindres, externe au cylindre, ménagée dans la face externe de la paroi limitant ledit cylindre et par une tôle pliée en forme générale de U, dont une première branche du U est en appui, par ses deux arêtes extrêmes internes, sur la surface interne du cylindre, la face externe de cette première branche constituant ladite surface formant butée axiale de limitation du coulissement du rouleau, dont la deuxième branche, d'une part a la face interne la délimitant en appui sur, ou à proximité de la face externe la plus proche du bloc-cylindres, d'autre part, se termine par un bord tombé ayant une face perpendiculaire à l'axe de coulissement du piston, orientée vers l'extérieur du cylindre, en appui sur une face de ladite rainure orientée en sens opposé, et ayant une arête disposée parallèlement à, et en appui sur le, ou à proximité immédiate du fond de la rainure, et dont la barre (du U) a sa face interne en appui sur la face supérieure de la paroi délimitant le cylindre;
  • - dans une deuxième variante de réalisation, un ensemble des moyens de maintien en position d'un rouleau est constitué par une sorte de lunule, qui est délimitée par une face cylindrique à base sensiblement circulaire de forme voisine de celle de la section droite du cylindre et par une face plane parallèle aux génératrices de cette face cylindrique et sécante de cette face cylindrique et dont la face cylindrique est appliquée contre la face intérieure du cylindre, et par un ergot de maintien par rapport au cylindre de la face cylindrique de ladite lunule dans sa configuration appliquée contre la face interne du cylindre;
  • - selon cette deuxième variante de réalisation, ou bien ledit ergot est constitué par une vis qui traverse la paroi du cylindre et coopère avec un taraudage dont est munie ladite lunule, ou bien la lunule est munie d'un trou borgne débouchant dans la face cylindrique de cette lunule, cependant qu'un pion est introduit dans ce trou borgne, est rappelé vers l'extérieur du trou borgne par un ressort interposé entre le fond du trou et lui-même et est susceptible d'être complètement escamoté à l'intérieur du trou borgne, d'être placé en regard d'un autre trou ménagé dans la paroi du cylindre et débouchant dans la face interne du cylindre, et de pénétrer partiellement dans ledit autre trou de la paroi du cylindre;
  • - enfin, selon une troisième variante préférée de réalisation, un ensemble des moyens de maintien en position d'un rouleau est constitué par une sorte de lunule, qui est délimitée par une face cylindrique à base sensiblement circulaire de forme voisine de celle de la section droite du cylindre et par une face plane parallèle aux génératrices de cette face cylindrique et sécante de cette face cylindrique, un logement d'une patte de fixation étant ménagé dans ladite face plane de la lunule de manière à permettre à une telle patte de fixation d'être disposée en retrait du plan de la face plane, et, dont la face cylindrique est appliquée contre la face intérieure du cylindre, par une rainure du bloc-cylindres externe au cylindre, ménagée dans la face externe de la paroi délimitant ledit cylindre et par un cavalier de maintien en forme générale de U, chevauchant la face supérieure de la paroi du cylindre, dont la barre (du U) reliant les deux branches du U a sa face interne en appui sur la face supérieure de ladite paroi du cylindre, dont une première branche est contenue dans ledit logement de la face plane de la lunule et est terminé par un bord tombé disposé en appui sur la face inférieure de la lunule, et dont la deuxième branche est située à l'extérieur du cylindre, en appui sur ou à proximité de la face externe du cylindre et est terminée par un bord tombé disposé en appui sur la face de ladite rainure orientée en sens opposé, et ayant une arête disposée parallèlement à, et à en appui sur le, ou à proximité immédiate du fond de la rainure.
Various alternative embodiments are advantageous, of which the following are often preferred:
  • - In the first embodiment, a set of means for holding in position a roller is constituted by a groove of the cylinder block, external to the cylinder, formed in the external face of the wall limiting said cylinder and by a folded sheet in the general shape of a U, of which a first branch of the U is supported, by its two internal end edges, on the internal surface of the cylinder, the external face of this first branch constituting said surface forming an axial stop for limiting the sliding of the roller, the second branch of which, on the one hand has the internal face delimiting it in abutment on, or close to the external face closest to the cylinder block, on the other hand, ends in a fallen edge having a face perpendicular to the sliding axis of the piston, oriented towards the outside of the cylinder, bearing on one face of said groove oriented in opposite direction, and having an edge arranged parallel to, and bearing on, or in the immediate vicinity of the bottom d e the groove, and the bar (of the U) has its internal face in abutment on the upper face of the wall defining the cylinder;
  • - In a second alternative embodiment, a set of means for holding in position a roller is constituted by a kind of lunula, which is delimited by a cylindrical face with a substantially circular base of shape similar to that of the straight section of the cylinder and by a parallel flat face the generators of this cylindrical and intersecting face of this cylindrical face and the cylindrical face of which is applied against the internal face of the cylinder, and by a retaining lug relative to the cylinder of the cylindrical face of said lunula in its configuration applied against the internal face of the cylinder;
  • - According to this second alternative embodiment, either said lug is constituted by a screw which passes through the wall of the cylinder and cooperates with a thread which is provided with said lunula, or else the lunula is provided with a blind hole opening into the cylindrical face of this lunula, however that a pin is introduced into this blind hole, is recalled towards the outside of the blind hole by a spring interposed between the bottom of the hole and itself and is capable of being completely retracted inside of the blind hole, to be placed opposite another hole made in the wall of the cylinder and opening into the internal face of the cylinder, and to partially penetrate said other hole in the wall of the cylinder;
  • - Finally, according to a third preferred embodiment, a set of means for holding in position a roller is constituted by a kind of lunula, which is delimited by a cylindrical face with a substantially circular base of shape similar to that of the section right of the cylinder and by a flat face parallel to the generatrices of this cylindrical face and intersecting this cylindrical face, a housing for a fixing lug being formed in said flat face of the lunula so as to allow such a fixing lug d '' be set back from the plane of the planar face, and, the cylindrical face of which is applied against the inside face of the cylinder, by a groove of the cylinder block external to the cylinder, formed in the external face of the wall delimiting said cylinder and by a jumper maintaining the general shape of a U, overlapping the upper face of the cylinder wall, the bar (of the U) connecting the two branches of the U to its internal face resting on the upper face of said cylinder wall, a first branch of which is contained in said housing on the flat face of the lunula and is terminated by a fallen edge placed in abutment on the underside of the lunula, and the second branch of which is located at the outside of the cylinder, bearing on or near the external face of the cylinder and is terminated by a fallen edge disposed bearing on the face of said groove oriented in opposite direction, and having an edge disposed parallel to, and at pressing on, or in the immediate vicinity of the bottom of the groove.

L'invention sera mieux comprise, et des caractéristiques secondaires et leurs avantages apparaîtront au cours de la description de réalisations donnée ci-dessous à titre d'exemple.The invention will be better understood, and secondary characteristics and their advantages will appear during the description of embodiments given below by way of example.

Il sera fait référence aux dessins annexés, dans lesquels:

  • - la figure 1 est une coupe axiale d'un moteur hydraulique conforme à une première variante de réalisation de l'invention;
  • - la figure 2 est une vue agrandie du détail A de la figure 1 et constitue une coupe suivant II-II de la figure 3;
  • - la figure 3 est une vue suivant flèche G de la figure 2;
  • - la figure 4 est une vue suivant flèche F de la figure 2;
  • - la figure 5 est une coupe, analogue à celle représentée sur la figure 2, d'une deuxième variante de réalisation conforme à l'invention;
  • - la figure 6 est une coupe suivant VI-VI de la figure 5;
  • - la figure 7 est une vue, analogue à celle de la figure 6, d'une troisième variante de réalisation conforme à l'invention;
  • - la figure 8 est une coupe, suivant VIII-VIII de la figure 9, d'une quatrième variante de réalisation conforme à l'invention; et,
  • - la figure 9 est une vue suivant flèche K de la figure 8.
Reference will be made to the accompanying drawings, in which:
  • - Figure 1 is an axial section of a hydraulic motor according to a first embodiment of the invention;
  • - Figure 2 is an enlarged view of detail A in Figure 1 and constitutes a section along II-II of Figure 3;
  • - Figure 3 is a view along arrow G of Figure 2;
  • - Figure 4 is a view along arrow F of Figure 2;
  • - Figure 5 is a section, similar to that shown in Figure 2, of a second embodiment according to the invention;
  • - Figure 6 is a section along VI-VI of Figure 5;
  • - Figure 7 is a view, similar to that of Figure 6, of a third alternative embodiment according to the invention;
  • - Figure 8 is a section along VIII-VIII of Figure 9, of a fourth embodiment according to the invention; and,
  • FIG. 9 is a view along arrow K in FIG. 8.

Le moteur de la figure 1 est constitué par:

  • - un carter en deux parties 1a, 1b, assemblées par des vis 2;
  • - une came ondulée 3, solidaire du carter 1-α-1!2;
  • - un arbre de sortie 4, monté à rotation dans le carter, autour d'un axe 5, au moyen de deux roulements à rouleaux 6, et, dont l'extrémité intérieure est munie de cannelures 7;
  • - un bloc-cylindres 8, qui comporte un évidement central muni de cannelures 9, associées aux cannelures 7 de l'arbre pour solidariser en rotation l'arbre 4 avec le bloc-cylindres 8 et pour centrer ce bloc-cylindres par rapport à cet arbre;
  • - un pluralité de cylindres 10 disposés radialement en étoile par rapport à l'axe 5, contenant chacun un piston 11, qui y est monté coulissant;
  • - une face plane 12, dont est muni le bloc-cylindres 8, qui est perpendiculaire à l'axe de rotation 5, et dans laquelle débouchent des conduits 13 reliés aux différents cylindres 10;
  • - un distributeur 14 de fluide aux divers cylindres 10, qui est muni d'une face plane 15, perpendiculaire à l'axe de rotation 5 et disposée en regard de et en appui sur la face 12 du bloc-cylindres, et qui comporte deux gorges circulaires 16, 17 communiquant, respectivement, avec une source de fluide sous pression 18 et avec un réservoir de fluide sans pression 19, cependant qu'un dispositif 20, à ergot et étrier, rend solidaire en rotation ce distributeur 14 avec la partie 1a du carter, et que des conduits 21, 22, relient les gorges 16, 17, respectivement, à la face plane 15 et sont susceptibles d'être mis en communication, successivement, pendant la rotation relative du bloc-cylindres 8 par rapport au distributeur 14, avec les conduits 13 du bloc-cylindres.
The engine of FIG. 1 is made up of:
  • - a housing in two parts 1a, 1b, assembled by screws 2;
  • - a wavy cam 3, integral with the casing 1-α-1! 2;
  • - An output shaft 4, rotatably mounted in the housing, around an axis 5, by means of two roller bearings 6, and, the inner end of which is provided with grooves 7;
  • - A cylinder block 8, which has a central recess provided with grooves 9, associated with the grooves 7 of the shaft to secure in rotation the shaft 4 with the cylinder block 8 and to center this cylinder block relative to this tree;
  • - A plurality of cylinders 10 arranged radially in a star with respect to the axis 5, each containing a piston 11, which is mounted therein sliding;
  • - A flat face 12, which is provided with the cylinder block 8, which is perpendicular to the axis of rotation 5, and into which there are conduits 13 connected to the different cylinders 10;
  • - A distributor 14 of fluid to the various cylinders 10, which is provided with a flat face 15, perpendicular to the axis of rotation 5 and arranged opposite and bearing on the face 12 of the cylinder block, and which comprises two circular grooves 16, 17 communicating, respectively, with a source of pressurized fluid 18 and with a pressureless fluid reservoir 19, while a device 20, with lug and stirrup, makes this distributor 14 integral in rotation with part 1a of the casing, and that conduits 21, 22 connect the grooves 16, 17, respectively, to the flat face 15 and are capable of being placed in communication, successively, during the relative rotation of the cylinder block 8 relative to the distributor 14, with the conduits 13 of the cylinder block.

Un rouleau ou galet cylindrique 23 est logé dans un palier 24 ménagé à l'extrémité de chaque piston 11, est monté rotatif autour d'un axe de rouleau 25 orthogonal à l'axe de piston 26 dudit piston et est en appui sur la came 3. Ce rouleau 23 est susceptible de pénétrer, au moins partiellement à l'intérieur du cylindre: la largeur du palier 24 est légèrement inférieure à la longueur du rouleau 23, de sorte que, du côté de chaque face transversale 27 délimitant le rouleau, un évidement 28 est ménagé dans la partie du piston 11 qui supporte ce rouleau, ce qui permet de constituer, de part et d'autre dudit rouleau, des espaces libres 29.A cylindrical roller or roller 23 is housed in a bearing 24 formed at the end of each piston 11, is rotatably mounted around a roller axis 25 orthogonal to the piston axis 26 of said piston and is supported on the cam 3. This roller 23 is capable of penetrating, at least partially inside the cylinder: the width of the bearing 24 is slightly less than the length of the roller 23, so that, on the side of each transverse face 27 delimiting the roller, a recess 28 is formed in the part of the piston 11 which supports this roller, which makes it possible to form, on either side of said roller, free spaces 29.

Les dispositions qui viennent d'être décrites se retrouvent dans chaque variante de réalisation représentée. En outre, dans ces diverses variantes représentées, le rouleau 23 a une longueur supérieure d'environ un millimètre à la largeur du palier 24 et dépasse donc légèrement de chaque extrémité dudit palier. Il reste cependant conforme à l'invention de concevoir des rouleaux ayant une longueur égale, ou même inférieure à celle du palier 24. De même, dans les variantes représentées, le plan P, perpendiculaire à l'axe 25 du rouleau 23 et contenant l'axe 26 du piston, est un plan de symétrie pour le piston 11, le palier 24, le rouleau 23, et les deux espaces 29. Il serait également possible, et conforme à l'invention, d'avoir une disposition dissymétrique dans laquelle les espaces 29 ne seraient pas symétriques l'un de l'autre par rapport à un plan perpendiculaire à l'axe 25 du rouleau.The arrangements which have just been described are found in each variant embodiment shown. In addition, in these various variants shown, the roller 23 has a length which is approximately one millimeter greater than the width of the bearing 24 and therefore protrudes slightly from each end of said bearing. However, it remains in accordance with the invention to design rollers having a length equal to, or even less than that of the bearing 24. Similarly, in the variants shown, the plane P, perpendicular to the axis 25 of the roller 23 and containing l axis 26 of the piston is a plane of symmetry for the piston 11, the bearing 24, the roller 23, and the two spaces 29. It would also be possible, and in accordance with the invention, to have an asymmetrical arrangement in which the spaces 29 would not be symmetrical to each other with respect to a plane perpendicular to the axis 25 of the roller.

Pour chaque réalisation, il convient de prévoir un moyen de maintenir en position axiale dans son palier 24, le rouleau 23 monté sur un piston 11 et de maintenir constante son orientation angulaire par rapport à l'axe 26 du piston, afin de faire en sorte que ce rouleau 23 soit disposé en regard de la came 3 et correctement orienté par rapport à cette came pour rouler sur la came. Les moyens qui ont été prévus pour atteindre ce but sont différents d'une réalisation à l'autre et vont maintenant être décrits.For each embodiment, it is necessary to provide a means of maintaining in axial position in its bearing 24, the roller 23 mounted on a piston 11 and of maintaining constant its angular orientation relative to the axis 26 of the piston, in order to ensure that this roller 23 is disposed opposite the cam 3 and correctly oriented relative to this cam to roll on the cam. The means which have been provided for achieving this goal differ from one embodiment to another and will now be described.

Dans la réalisation des figures 2, 3 et 4, une rainure 30 est ménagée dans la face externe 31 de chaque paroi latérale 32 délimitant transversalement le bloc-cylindres 8, et comporte un fond 33 de rainure, et une face 34 orientée dans le sens opposé de celui L vers lequel débouche le cylindre 10 et située à une distance D de la face supérieure 35 du bloc-cylindres, dans laquelle débouche le cylindre 10. Des cavaliers en forme de U, comprenent chacun une première branche 36 et une deuxième branche 37 reliées par une barre 38, chevauchent, chacun, l'une desdites parois latérales 32. La première branche 36 a sa face interne 39 délimitée en largeur par deux arêtes 40, qui sont parallèles à l'axe 26 du piston 11 et qui sont en appui sur deux génératrices de la surface intérieure cylindrique (10) du cylindre 10, et, a sa face externe 41 disposée en regard et à proximité d'une des tranches transversales 27 du rouleau 23 et constituant ainsi une butée de limitation du coulissement éventuel du rouleau 23 par rapport à son axe 25. La face interne 42 de la barre 38 du cavalier en U est en appui sur la face supérieure 35 du bloc-cylindres. La deuxième branche 37 du U a sa face interne 43 en appui sur la face externe 31 de la paroi 32 du bloc-cylindres et a son extrémité se terminant par un bord tombé, dont une face 44 est parallèle à la face 34 de la rainure 30 et est en appui sur cette face 34 et dont le bord rectiligne extrême 45 est disposé parallèlement au, et à proximité du fond 33 de la rainure. La mise en place de ces deux cavaliers en U conduit à leur immobilisation par rapport au bloc-cylindres 8. En effet, parallèlement à l'axe 26 du piston 11, chaque cavalier ne peut ni descendre, car en appui par sa face 42 sur la face supérieure 35 du bloc-cylindres, ni monter, car la face 44 de son bord tombé est en appui sur la face 34 de la rainure 30. Suivant l'axe 25 du rouleau, les arêtes 40 sont en appui sur la face interne (10) du cylindre, et la face interne 43 de la deuxième branche est en appui sur la face externe 31 de la paroi 32. Enfin, l'appui de la face 43 de la branche 37 sur la face 31 de la paroi 32 du bloc-cylindres interdit toute rotation notable du cavalier autour de l'axe 26 du piston 11. Avec ces dispositions, les faces 41 des deux cavaliers sont maintenues en position en regard des tranches transversales 27 du rouleau, qui, par ce moyen, est correctement maintenu en position, tant axialement (parallèlement à son axe 25), qu'en orientation angulaire (par rapport à l'axe 26 du piston). A noter, que de manière connue, le palier 24 entoure circonférentiellement le rouleau 23 correspondant par un arc de cercle supérieur à 180°.In the embodiment of Figures 2, 3 and 4, a groove 30 is formed in the outer face 31 of each side wall 32 transversely delimiting the cylinder block 8, and has a bottom 33 of groove, and a face 34 oriented in the direction opposite to that L towards which the cylinder 10 opens and located at a distance D from the upper face 35 of the cylinder block, into which the cylinder opens 10. U-shaped jumpers each comprise a first branch 36 and a second branch 37 connected by a bar 38, each overlap one of said side walls 32. The first branch 36 has its internal face 39 delimited in width by two edges 40 which are parallel to the axis 26 of the piston 11 and which are resting on two generatrices of the cylindrical inner surface (10) of the cylinder 10, and, with its external face 41 disposed opposite and near one of the transverse sections 27 of the roller 23 and thus constituting a stop for limiting any sliding of roller 23 with respect to its axis 25. The internal face 42 of the bar 38 of the U-shaped rider bears on the upper face 35 of the cylinder block. The second branch 37 of the U has its internal face 43 bearing on the external face 31 of the wall 32 of the cylinder block and at its end ending in a fallen edge, one face 44 of which is parallel to the face 34 of the groove 30 and is supported on this face 34 and whose extreme rectilinear edge 45 is arranged parallel to, and near the bottom 33 of the groove. The establishment of these two U-shaped jumpers leads to their immobilization with respect to the cylinder block 8. In fact, parallel to the axis 26 of the piston 11, each jumper can neither descend, since it is supported by its face 42 on the upper face 35 of the cylinder block, or go up, because the face 44 of its fallen edge is supported on the face 34 of the groove 30. Along the axis 25 of the roller, the edges 40 are supported on the internal face (10) of the cylinder, and the internal face 43 of the second branch is supported on the external face 31 of the wall 32. Finally, the support of the face 43 of the branch 37 on the face 31 of the wall 32 of the cylinder block prohibits any significant rotation of the rider around the axis 26 of the piston 11. With these provisions, the faces 41 of the two riders are held in position facing the transverse sections 27 of the roller, which, by this means, is correctly maintained in position, both axially (parallel to its axis 25), and in angular orientation (relative to axis 26 of the piston). Note that in known manner, the bearing 24 circumferentially surrounds the corresponding roller 23 by an arc of a circle greater than 180 ° .

Dans la réalisation des figures 5 et 6, une sorte de lunule 46, dont la section droite a approximativement la forme de celle d'un espace 29, occupe une partie de cet espace. Elle est délimitée, notamment, par une face cylindrique 47, qui est en appui sur la face cylindrique interne (10) du cylindre, et par une face plane 48 disposée parallèlement à une face transversale 27 du rouleau 23, à proximité et en regard de cette face 27. La lunule 46 comporte un trou taraudé 49, susceptible d'être disposé en regard d'un trou traversant 50, dont est munie chaque paroi latérale 32 du bloc-cylindres. Une vis 51, traversant le trou 50, possède un filetage 52 susceptible de coopérer avec le taraudage 49 pour immobiliser la lunule par rapport au cylindre 10. Là encore, les faces planes 48 des lunules 46 constituent des butées d'immobilisation du rouleau 23 dans le sens du coulissement parallèlement à son axe 25 et en orientation angulaire par rapport à l'axe 26 du piston 11.In the embodiment of FIGS. 5 and 6, a kind of lunula 46, the cross section of which has approximately the shape of that of a space 29, occupies part of this space. It is delimited, in particular, by a cylindrical face 47, which is in abutment on the internal cylindrical face (10) of the cylinder, and by a planar face 48 disposed parallel to a transverse face 27 of the roller 23, near and opposite this face 27. The lunula 46 has a tapped hole 49, capable of being disposed opposite a through hole 50, which is provided with each side wall 32 of the cylinder block. A screw 51, passing through the hole 50, has a thread 52 capable of cooperating with the internal thread 49 to immobilize the lunula relative to the cylinder 10. Again, the flat faces 48 of the lunules 46 constitute stops for immobilizing the roller 23 in the direction of sliding parallel to its axis 25 and in angular orientation relative to the axis 26 of the piston 11.

Une variante de réalisation des figures 5 et 6 est représentée sur la figure 7. On retrouve les lunules 46 et leurs faces planes 48 et cylindriques 47: seuls les moyens d'immobilisation des lunules sont différents. Dans la réalisation de la figure 7, chaque lunule comporte une cavité 53, qui débouche dans sa face cylindrique, est susceptible de contenir entièrement un ressort 54 et un pion coulissant 55, que le ressort 54 tend à pousser hors de la ca- vite 53. Dans la position de service, la lunule a sa cavité 53 disposée en regard d'un logement 56 ménagé dans la paroi latérale 32 du bloc-cylindres, débouchant dans la face cylindrique interne (10) du cylindre et susceptible de recevoir une partie du pion 55. Naturellement, lorsqu'après avoir été introduite dans le cylindre 53, la lunule est mise en place pour disposer en regard l'une de l'autre, la cavité 53 et le logement 56, le pion 55 coulisse vers l'extérieur de la cavité 53, poussé par le ressort 54, et, pénétrant dans le logement 56, immobilise la lunule 46 par rapport au bloc-cylindres. Un trou 57, réalise le passage d'une tige pour repousser le pion hors du logement 56, afin de permettre le démontage ultérieur des lunules.An alternative embodiment of FIGS. 5 and 6 is shown in FIG. 7. We find the lunules 46 and their planar 48 and cylindrical faces 47: only the means for immobilizing the lunules are different. In the embodiment of FIG. 7, each lunula has a cavity 53, which opens into its cylindrical face, is capable of entirely containing a spring 54 and a sliding pin 55, which the spring 54 tends to push out of the box 53 In the operating position, the lunula has its cavity 53 arranged opposite a housing 56 formed in the side wall 32 of the cylinder block, opening into the internal cylindrical face (10) of the cylinder and capable of receiving part of the pin 55. Naturally, when after having been introduced into the cylinder 53, the lunula is put in place so as to have facing one another, the cavity 53 and the housing 56, the pin 55 slides outwards of the cavity 53, pushed by the spring 54, and, penetrating into the housing 56, immobilizes the lunula 46 relative to the cylinder block. A hole 57, carries out the passage of a rod to push the pin out of the housing 56, in order to allow the subsequent disassembly of the lunulas.

Enfin, dans la variante des figures 8 et 9, deux lunules 46 sont prévues, dont la face plane 48 de chacune d'elles comporte dans sa zone centrale un logement 58 de la première branche 59 d'un cavalier en U. Cette branche 59 se termine par un premier bord tombé 60, qui est écarté de la face interne 42 de la barre 38 du U, d'une distance égale à la hauteur d'une lunule. Par ailleurs, la deuxième branche 37 du U se termine par un deuxième bord tombé délimité par une face plane 44, qui est en appui sur la face supérieure 34 d'une rainure 30 dont est munie la face extérieure 31 de la paroi 32, lorsque la face interne 42 de la barre du U est en appui sur la face supérieure 35 de la paroi 32 du bloc-cylindres, et par une arête droite 45 qui est en appui sur le fond 33 de la rainure 30. On comprend que chaque lunule 46 est ainsi immobilisée par rapport au bloc-cylindres, au moyen de ce cavalier en U.Finally, in the variant of FIGS. 8 and 9, two lunules 46 are provided, the flat face 48 of each of which has in its central zone a housing 58 of the first branch 59 of a U-shaped jumper. This branch 59 ends with a first fallen edge 60, which is spaced from the internal face 42 of the bar 38 of the U, a distance equal to the height of a lunula. Furthermore, the second branch 37 of the U ends in a second fallen edge delimited by a flat face 44, which bears on the upper face 34 with a groove 30 which is provided on the outer face 31 of the wall 32, when the internal face 42 of the U-bar is supported on the upper face 35 of the wall 32 of the cylinder block, and by a straight edge 45 which is supported on the bottom 33 of the groove 30. It is understood that each lunula 46 is thus immobilized relative to the cylinder block, by means of this U-shaped jumper.

Chacune des réalisations décrites permet donc la mise en place de faces planes, ou sensiblement planes 41, 48, de maintien de rouleau 23 dans son palier 24, ceci dans toutes les positions que peut occuper le piston 11 (voir sur la figure 4, en traits interrompus, les deux positions extrêmes que peuvent occuper les faces transversales du rouleau 23.Each of the embodiments described therefore allows the establishment of planar, or substantially planar, faces 41, 48, for holding the roller 23 in its bearing 24, this in all the positions that the piston 11 can occupy (see in FIG. 4, in broken lines, the two extreme positions which the transverse faces of the roller 23 can occupy.

Il convient d'observer que l'orientation angulaire du rouleau 23 par rapport à l'axe 26 du piston pourrait être maintenue constante en plaçant des faces de butée 41 ou 48 en regard des faces planes délimitant les évidements 28 des pistons 11: cette solution est également conforme à l'invention revendiquée.It should be observed that the angular orientation of the roller 23 relative to the axis 26 of the piston could be kept constant by placing abutment faces 41 or 48 opposite the flat faces delimiting the recesses 28 of the pistons 11: this solution also conforms to the claimed invention.

Par ailleurs, dans les réalisations utilisant des cavaliers en U, telles que celles des figures 5 et 6, 7 et 8 et 9, il est bien entendu possible, lorsque le moteur comprend deux rangées de cylindres côte à côte, d'utiliser un seul cavalier en U pour deux des lunules de deux cylindres côte à côte.Furthermore, in the embodiments using U-shaped jumpers, such as those of FIGS. 5 and 6, 7 and 8 and 9, it is of course possible, when the engine comprises two rows of cylinders side by side, to use a single U-shaped jumper for two of the two-cylinder lunules side by side.

Claims (6)

1. Hydraulic mechanism, engine or pump, comprising:
- a cam (3),
- a cylinder block (8) mounted to rotate with respect to the cam,
- a plurality of cylinders (10) arranged in this cylinder block,
- a plurality of pistons (11) each mounted to slide inside a cylinder along an axis of slide (of the piston) (26),
- a plurality of abutment rollers (23) for rolling of the pistons on the cam, each roller (23) being mounted on a piston, rotatable about a roller axis (25) perpendicular to the axis of slide (26) of said piston by means of a rotation bearing (24), being axially defined by two substantially plane and parallel, transverse end faces (27) and being capable of penetrating, at least partially, inside the cylinder in which this piston is mounted to slide, the end of said piston, in which is arranged said rotation bearing of the roller, further comprising two recesses which are defined by two substantially plane, parallel faces (28),
- means for holding the rollers in position in their respective bearings, rendered fast with the cylinder block and preventing any escape of each roller from its bearing by sliding in the direction of the roller axis of said roller, whereas, the cylinder block (8) comprising at least one row of cylinders whose axes (26) are substantially contained in the same transverse plane perpendicular to the axis of rotation (5) of the cylinder block with respect to the cam (3) and are disposed radially, the means for holding any two rollers in position, corresponding to two successive cylinders belonging to the same row of cylinders, are constituted by pieces distinct from one another, characterized in that the means for holding a roller in positioin are constituted by two assemblies (36, 36) independent of each other, each comprising an axial stop for limiting the slide of the roller parallel to the roller axis, defined by a support of a substantially plane surface (41)
- which, in the direction of the roller axis (25), abuts on that part of the inner face (10) of the corresponding cylinder located in the zone of clearance of one of the two recesses (28) that the piston comprises,
- which is maintained in abutment on said inner surface of the cylinder by a radial retaining means (40, 37, 31, 43),
- which is maintained in position in the direction of the axis of slide (26) of the piston by an axial fixing means (42-35, 44-34),
- of which the radial orientation with respect to the cylinder is rendered substantially constant by a means (45-33; 31-43) for maintaining orientation, and
- which effectively supports a substantially plane surface (41) forming axial stop for limiting the slide of the roller, parallel to the transverse end surfaces (27) of the roller (23) and to the substantially plane faces (28) of the two recesses of the piston and is disposed opposite and in the immediate proximity of said face of a recess and/or of the roller, that face (27) which is closest to this face forming axial stop depending on whether the length of the roller is shorter than, equal to or greater than that of its bearing.
2. Mechanism of Claim 1, (Figures 2, 3 and 4), characterized in that an assembly of means for holding a roller in position is constituted by a groove (30) in the cylinder block, outside the cylinder, made in the outer face (31) of the wall (32) limiting said cylinder (10) and by a metal sheet generally folded in the form of a U, of which a first arm (36) of the U is in abutment, by its two inner end edges (40), on the inner surface (10) of the cylinder, the outer face (41) of said first arm (36) constituting said surface forming axial stop for limiting the slide of the roller, of which the second arm (37), on the one hand, has the inner face (43) defining it in abutment on or in the vicinity of the outer face closest to the cylinder block, on the other hand, terminates in a fallen edge having a face (33) perpendicular to the axis of slide (26) of the piston, oriented outwardly (L) of the cylinder, in abutment on a face (34) of said groove (30) oriented in opposite direction, and having an edge (45) disposed parallel to, and in abutment on, or in the immediate vicinity of the bottom (33) of the groove, and of which the bar (38) (of the U) has its inner face (42) in abutment on the upper face (35) of the wall (32) defining the cylinder.
3. Mechanism according to Claim 1, (Figures 5, 6 and 7), characterized in that an assembly of means for holding a roller in position is constituted by a sort of crescent (46), which is defined by a cylindrical face (47) with substantially circular base whose shape is close to that of the cross section of the cylinder (10) and by a plane face (48) parallel to the generatrices of this cylindrical face and secant of this cylindrical face (47) and whose cylindrical face is applied against the inner face (10) of the cylinder, and by a catch (51-52) for holding with respect to the cylinder (10) the cylindrical face of said crescent in its configuration applied against the inner face of the cylinder.
4. Mechanism according to Claim 3, (Figures 5 and 6), characterized in that said catch is constituted by a screw (51) which passes through (50) the wall (32) of the cylinder and cooperates with a tapping (39) with which said crescent is provided.
5. Mechanism according to Claim 3, (Figure 7), characterized in that the crescent (46) is provided with a blind hole (53) opening in the cylindrical face (47) of this crescent, whereas a lug (55) is introduced into this blind hole, is returned outwardly of the blind hole by a spring (54) interposed between the bottom of the hole and itself, and is capable of being completely retracted inside the blind hole, of being placed opposite another hole (56) made in the wall (32) of the cylinder and opening in the inner face (10) of the cylinder, and of partially penetrating in said other hole (56) in the wall of the cylinder.
6. Mechanism according to Claim 1, (Figures 8 and 9), characterized in that an assembly of means for holding a roller in position is constituted by a sort of crescent (46), which is defined by a cylindrical face (47) with substantially circular base whose shape is close to that of the cross section of the cylinder and by a plane face (48) parallel to the generatrices of this cylindrical face and secant of this cylindrical face, a housing (58) for a fixing tab (59) being made in said plane face (48) of the crescent so as to allow such a fixing tab to be recessed with respect to the plane of the plane face, and of which the cylindrical face (47) is applied against the inner face (10) of the cylinder, by a groove (30) in the cylinder block outside the cylinder, made in the outer face (31) of the wall defining said cylinder and by a generally U-shaped holding staple straddling the upper face (35) of the wall of the cylinder, of which the bar (38) (of the U) joining the two arms of the U has its inner face (42) in abutment on the upper face (35) of said wall of the cylinder, of which a first arm 59) is contained in said housing (58) in the plane face of the crescent and terminates in a fallen edge (60) disposed in abutment on the lower face of the crescent, and of which the second arm (37) is located outside the cylinder, in abutment on or in the vicinity of the outer face of the cylinder and terminates in a fallen edge (44) disposed in abutment on the face (34) of said groove oriented in opposite direction, and having an edge (45) disposed parallel to, and in abutment on, or in the immediate vicinity of the bottom (33) of the groove.
EP86401030A 1985-05-15 1986-05-14 Hydraulic mechanism, engine or pump with rollers mounted on the pistons and with means for keeping these rollers in position Expired EP0205368B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8507426A FR2582058B1 (en) 1985-05-15 1985-05-15 HYDRAULIC MECHANISM, MOTOR OR PUMP, PROVIDED WITH ROLLERS MOUNTED ON THE PISTONS AND HOLDERS IN THE POSITION OF SAID ROLLERS
FR8507426 1985-05-15

Publications (2)

Publication Number Publication Date
EP0205368A1 EP0205368A1 (en) 1986-12-17
EP0205368B1 true EP0205368B1 (en) 1989-05-03

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EP86401030A Expired EP0205368B1 (en) 1985-05-15 1986-05-14 Hydraulic mechanism, engine or pump with rollers mounted on the pistons and with means for keeping these rollers in position

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US (1) US4719843A (en)
EP (1) EP0205368B1 (en)
JP (1) JPS61265325A (en)
DE (1) DE3663174D1 (en)
FI (1) FI80766C (en)
FR (1) FR2582058B1 (en)
IN (1) IN165940B (en)

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Also Published As

Publication number Publication date
EP0205368A1 (en) 1986-12-17
IN165940B (en) 1990-02-10
FR2582058B1 (en) 1989-06-30
FI861905A0 (en) 1986-05-07
US4719843A (en) 1988-01-19
FI861905A (en) 1986-11-16
JPS61265325A (en) 1986-11-25
DE3663174D1 (en) 1989-06-08
FI80766C (en) 1990-07-10
FR2582058A1 (en) 1986-11-21
FI80766B (en) 1990-03-30

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