EP0509898B1 - System with a hydraulic motor having a brake and application to a vibratory compactor - Google Patents

Description

The invention has its origin in the search for a solution to the problem of driving the compacting rollers of a compactor.

According to a first known embodiment, the compactor comprises a single compacting roller, which is rotatably mounted relative to the frame of the compactor with the interposition of flexible vibration isolation elements. A hydraulic motor, generally at low speed and with high torque, is coupled to the compacting roller and ensures its drive, being placed at one end of, and coaxial with said compacting roller.

In order to improve the compaction efficiency, an eccentric mass is placed inside, hollow, of the compaction roller, and is rotated by means of another motor, generally constituted by a high speed hydraulic motor and little couple. This other motor is placed at the other end of the compaction roller, coaxial with it, and drives the eccentric mass via a shaft.

To improve the maneuverability of the compactors, in particular when cornering, certain compactors comprise two coaxial compacting rollers, in the extension of one another, and coupled to two separate hydraulic motors. Thus, the rollers can have different rotations, which avoids the destruction of compacted soils. On the side where the drive motor for the eccentric mass is already placed, it is not possible to directly couple the drive motor for the compaction roller corresponding to this compaction roller. The known solution consists in offsetting said drive motor of the compacting roller; placing it where there is room, that is to say next to the eccentric mass drive motor; and coupling the drive shaft of the drive motor of the compaction roller to said compaction roller by means of a ring gear and pinions of gears. The whole is complex, bulky, heavy and expensive.

The object of the invention is to remedy these drawbacks by proposing a solution where the two motors located on the same side of one of the compacting rollers are arranged coaxially with one another and with this compacting roller. To do this, a new hydraulic motor had to be studied before it could be applied to compactors, a hydraulic motor fitted with a brake.

The invention therefore firstly relates to an assembly of a hydraulic motor and a brake which is coupled thereto, comprising: a central motor element traversed by a first axial recess; a peripheral motor element mounted for rotation relative to said central motor element about an axis; and a brake shaft, which is integral, with respect to said relative rotation, of said central motor element and which extends axially concomitantly opposite the central motor element and opposite the brake.

According to the invention: a) the brake comprises a casing, at least part of which is integral with the peripheral element of the engine, and which itself comprises a bottom arranged transversely to the axis; b) the bottom has a through bore; c) the brake shaft passes completely through the assembly of the motor and the brake, and said bore at the bottom of the brake housing; d) two seals are interposed between the brake shaft and, on the one hand, the first recess of the central element of the engine, on the other hand, said bore in the bottom of the brake housing, respectively; e) the brake shaft has a second recess passing entirely through it.

• le carter de frein comprend une partie périphérique, qui est solidaire de l'élément périphérique du moteur, et, un couvercle de fermeture, distinct de ladite partie périphérique et constituant ledit fond ;
• une bride d'adaptation est fixée sur la partie périphérique du carter de frein, cependant que ledit couvercle de carter de frein constitue en outre un organe de poussée d'organes de freinage que comporte le frein, un organe élastique de rappel étant interposé entre le couvercle de carter de frein et ladite bride d'adaptation.

The following advantageous arrangements are also preferably adopted:

• the brake housing comprises a peripheral part, which is integral with the peripheral element of the engine, and, a closing cover, separate from said peripheral part and constituting said bottom;
• an adapter flange is fixed on the peripheral part of the brake housing, while said brake housing cover further constitutes a member for thrusting braking that includes the brake, an elastic return member being interposed between the brake housing cover and said adapter flange.

The invention also relates to a compactor which comprises at least one assembly according to one of the preceding definitions.

According to the invention, this compactor comprises at least one set of a hydraulic motor and a brake in accordance with the preceding definitions and further comprises: two separate compacting rollers, cylindrical, mounted for rotation about a common geometric axis; two main hydraulic motors for driving said rollers coupled between the compactor frame and, one of the main hydraulic motors, one of said compacting rollers, the other main hydraulic motor, the other compacting roller, a first of said main hydraulic motors forming part of an assembly according to one of the preceding definitions; an eccentric mass relative to said geometric axis; and a third motor for driving said eccentric mass, coupled between the frame of the compactor and said mass, and comprising two elements mounted for rotation relative to each other; however that, on the one hand, a first of said elements of the third motor is made integral with respect to the rotation of the peripheral element of the first main hydraulic motor, on the other hand, the second of the two said elements of the third motor is made integral with respect to the rotation of a shaft which passes through the second recess formed in the brake shaft of the brake belonging to said assembly of which said first main hydraulic motor forms a part.

• ledit premier élément du troisième moteur est rendu solidaire vis-à-vis de la rotation de l'élément périphérique du premier moteur hydraulique principal au moyen d'une bride intermédiaire, distincte desdits troisième moteur et premier moteur hydraulique principal ;
• une bride d'adaptation est fixée sur la partie périphérique du carter de frein, cependant que ledit couvercle de carter de frein constitue, en outre, un organe de poussée d'organes de freinage que comporte le frein, un organe élastique de rappel étant interposé entre le couvercle de carter de frein et ladite bride d'adaptation, la bride intermédiaire étant constituée par ladite bride d'adaptation.

The following advantageous arrangements are also preferably adopted:

• said first element of the third motor is made integral with respect to the rotation of the peripheral element of the first main hydraulic motor by means of an intermediate flange, distinct from said third motor and first main hydraulic motor;
• an adapter flange is fixed on the peripheral part of the brake housing, while said brake housing cover further constitutes a member for pushing the braking members which the brake comprises, an elastic return member being interposed between the brake housing cover and said adapter flange, the intermediate flange being constituted by said adapter flange.

The main advantage of the invention lies in the fact that the axial recess in the brake shaft allows the passage of a drive shaft connecting the eccentric mass to its drive motor, while making it possible to place the hydraulic motor for driving the compacting roller coaxially with said compacting roller and thus directly drive this compacting roller.

The invention will be better understood, and secondary characteristics and their advantages will appear during the description of an embodiment given below by way of example.

It is understood that the description and the drawings are given for information only and are not limiting.

• la figure 1 est une coupe axiale d'un ensemble, conforme à l'invention, d'un moteur hydraulique et d'un frein qui y est attelé ; et
• la figure 2 est une coupe schématique d'un rouleau de compacteur et des moteurs freins pour son entraînement.

Reference will be made to the accompanying drawings, in which:

• Figure 1 is an axial section of an assembly, according to the invention, a hydraulic motor and a brake which is coupled thereto; and
• Figure 2 is a schematic section of a compactor roller and brake motors for its drive.

• un élément périphérique de moteur, en deux parties 1A et 1B, la partie 1A présentant une face intérieure constituant une came ondulée de réaction 2, prolongée axialement, par rapport à un axe 10, par le support 3 d'un palier unique à billes 4, et, la partie 1B, assemblée à la partie 1A, avec interposition d'un joint d'étanchéité 5, par des vis 6, comportant un alésage étagé 7 ;
• un élément central de moteur 8, qui constitue le bloc-cylindres du moteur hydraulique, dans lequel sont ménagés des cylindres 9 disposés radialement par rapport à l'axe 10 et angulairement régulièrement espacés, cet élément central comprenant le support 11 complémentaire du support 3 et réalisant avec celui-ci et les billes 4 un palier de rotation d'axe 10 ; une face plane 12 de communication dans laquelle débouchent des conduits de cylindres 13 reliés à des chambres 14 de travail d'un fluide, ménagées dans les cylindres 9, face plane perpendiculaire à l'axe 10 ; des cannelures 15, dont est muni un alésage du bloc-cylindres 8, coaxiales à l'axe 10 ; et une face transversale 16, qui constitue une première extrémité axiale de l'ensemble du moteur hydraulique et du frein, dans laquelle débouchent des taraudages 17 permettant la fixation du bloccylindres 8, par exemple sur un voile transversal 78 dont est muni l'un 60 des rouleaux 59, 60 d'un compacteur (figure 2) ;
• des pistons 18 montés coulissants dans les cylindres 9 et ménageant avec ceux-ci lesdites chambres 14 de travail d'un fluide ;
• des rouleaux 19 montés aux extrémités externes des pistons 18, un par piston, d'axes parallèles à l'axe 10, maintenus axialement par des butées axiales 20 et susceptibles d'être en appui de roulement sur la came de réaction 2 ;
• un distributeur interne de fluide 21 qui constitue un noyau dont la face axiale extérieure 22 est complémentaire de celle de l'alésage étagé 7, ce distributeur interne 21 comportant : une face plane 23, de distribution, perpendiculaire à l'axe 10 et en appui sensiblement étanche sur la face de communication 12 du bloc-cylindres 8 ; des conduits de distribution 24, qui débouchent dans la face de distribution 23 de manière à pouvoir communiquer avec les orifices des conduits de cylindres 13 par lesquels ceux-ci débouchent dans la face de communication 12, et qui relient ladite face de distribution 23 à des gorges 25, 26 ménagées dans l'alésage étagé 7 de la partie 1B de l'élément périphérique au moteur ; un ensemble de pions et d'encoches 127 réalisant la solidarisation vis-à-vis de la rotation autour de l'axe 10, du distributeur interne 21 et de ladite partie 1B ; et une face transversale 31 perpendiculaire à l'axe 10, qui constitue l'autre extrémité axiale du moteur hydraulique, qui s'étend donc axialement sur une longueur D1 ;
• des conduits 27, 28, ménagés dans la partie 1B de l'élément périphérique 1A-1B, reliant lesdites gorges 25, 26 à des conduits externes 29, 30, respectivement, ceux-ci constituant l'un un conduit d'alimentation en fluide sous pression, l'autre un conduit d'échappement de fluide, et réciproquement ;
• une partie périphérique 32 de carter de frein, qui comporte deux faces transversales 33, 34 perpendiculaires à l'axe 10 et s'étend donc axialement sur une longueur D32, la face transversale 33 étant placée en appui sur la face d'extrémité 31 de la partie 1B, avec interposition d'un joint d'étanchéité 36 et la partie périphérique 32 du carter de frein étant fixée sur ladite partie 1B du moteur hydraulique par des vis 35 ;
• un arbre de frein 37 qui s'étend coaxialement à l'axe 10, en regard des cannelures 15 du bloc-cylindres 8, d'un alésage 38 que comporte le distributeur interne 21, et de la partie périphérique 32 du carter de frein, en grande partie le long des longueurs D1 et D32 ; cet arbre de frein comportant des cannelures 39 qui coopèrent avec les cannelures 15 du bloc-cylindres 8 pour rendre solidaires,vis-à-vis de la rotation d'axe 10, le bloccylindres 8 et l'arbre de frein 37 ; un évidement axial 40, traversant entièrement ledit arbre de frein 37 et, en l'espèce, coaxial à l'axe 10 ; et une portée cylindrique d'extrémité 41 ;
• un couvercle 42 de carter de frein comportant un alésage traversant 42A, monté coulissant, parallèlement à l'axe 10, par rapport à la portée cylindrique 41 et par rapport à un alésage 43 que comporte la partie périphérique 32 du carter de frein ;
• des joints d'étanchéité 44, 45, 46 : le joint d'étanchéité 44 étant interposé entre l'alésage 42A du couvercle 42 et la portée cylindrique 41 ; le joint d'étanchéité 45 étant interposé entre le couvercle 42 et l'alésage 43 ; et, le joint d'étanchéité 46 étant interposé entre l'arbre de frein 37 et l'alésage axial du bloc-cylindres 8, l'ensemble de l'arbre de frein 37, de la partie périphérique 32 du carter de frein et du couvercle 42 délimitant une chambre étanche 47 ;
• un conduit 48, ménagé dans la partie périphérique 32 du carter de frein, reliant la chambre 47 à un conduit externe 49 susceptible de contenir un fluide sous pression ou d'être au contraire mis en communication avec un réservoir de fluide sans pression ;
• des disques de frein solidaires vis-à-vis de la rotation, les disques de frein 50 de l'arbre de frein 37, les disques de frein 51 de la partie périphérique 32 du carter de frein, les disques de frein 50, 51 étant alternés et constituant un empilage de disques de frein disposé en regard d'une face transversale 52 de poussée, appartenant au couvercle 42 ;
• une bride d'adaptation 53, qui est fixée sur la partie périphérique 32 du carter de frein par des vis 54, en étant placée en appui sur la face d'extrémité 34 de ladite partie périphérique 32, cette bride d'adaptation 53 présentant un alésage axial 55, d'axe 10, et des taraudages 56 permettant la fixation d'une structure, telle que le carter 79 d'un autre moteur hydraulique 76 ;
• une rondelle élastique 57 prend appui sur la face transversale interne 58 de la bride d'adaptation 53 et tend à pousser le couvercle 42 dans le sens mettant en appui la face 52 de ce couvercle sur l'extrémité de l'empilage des disques 50, 51, c'est-à-dire dans le sens aboutissant au freinage, l'action de la rondelle 57 étant antagoniste de celle de la pression du fluide éventuellement contenu dans la chambre 47, qui permet l'obtention du défreinage des disques de frein 50, 51.

The motor shown in FIG. 1 is a hydraulic motor associated with a multiple disc brake, the assembly comprising:

• a peripheral motor element, in two parts 1A and 1B, the part 1A having an inner face constituting a wavy reaction cam 2, extended axially, relative to an axis 10, by the support 3 of a single ball bearing 4 , and, part 1B, assembled in part 1A, with the interposition of a seal 5, by screws 6, comprising a stepped bore 7;
• a central engine element 8, which constitutes the cylinder block of the hydraulic motor, in which are provided cylinders 9 arranged radially with respect to the axis 10 and angularly regularly spaced, this central element comprising the support 11 complementary to the support 3 and producing with the latter and the balls 4 an axis of rotation bearing 10; a planar face 12 of communication into which the cylinder conduits 13 connected to chambers 14 for working with a fluid, formed in the cylinders 9, planar face perpendicular to the axis 10; grooves 15, which is provided with a bore of the cylinder block 8, coaxial with the axis 10; and a transverse face 16, which constitutes a first axial end of the assembly of the hydraulic motor and the brake, into which open threads 17 allowing the fixing of the cylindrical cylinders 8, for example on a transverse web 78 which is provided with one 60 rollers 59, 60 of a compactor (Figure 2);
• pistons 18 slidably mounted in the cylinders 9 and providing therewith said chambers 14 for working with a fluid;
• rollers 19 mounted at the outer ends of the pistons 18, one per piston, with axes parallel to the axis 10, held axially by axial stops 20 and capable of being in rolling bearing on the reaction cam 2;
• an internal fluid distributor 21 which constitutes a core whose external axial face 22 is complementary to that of the stepped bore 7, this internal distributor 21 comprising: a flat face 23, of distribution, perpendicular to the axis 10 and in support substantially sealed on the communication face 12 of the cylinder block 8; distribution conduits 24, which open into the distribution face 23 so as to be able to communicate with the orifices of the cylinder conduits 13 through which these open into the communication face 12, and which connect said distribution face 23 to grooves 25, 26 formed in the stepped bore 7 of part 1B of the element peripheral to the engine; a set of pins and notches 127 making the connection with respect to the rotation about the axis 10, the internal distributor 21 and said part 1B; and a face transverse 31 perpendicular to the axis 10, which constitutes the other axial end of the hydraulic motor, which therefore extends axially over a length D1;
• conduits 27, 28, formed in part 1B of the peripheral element 1A-1B, connecting said grooves 25, 26 to external conduits 29, 30, respectively, these constituting one of a fluid supply conduit under pressure, the other a fluid exhaust duct, and vice versa;
• a peripheral part 32 of the brake housing, which has two transverse faces 33, 34 perpendicular to the axis 10 and therefore extends axially over a length D32, the transverse face 33 being placed in abutment on the end face 31 of part 1B, with the interposition of a seal 36 and the peripheral part 32 of the brake housing being fixed to said part 1B of the hydraulic motor by screws 35;
• a brake shaft 37 which extends coaxially to the axis 10, opposite the grooves 15 of the cylinder block 8, a bore 38 that includes the internal distributor 21, and the peripheral part 32 of the brake housing, largely along the lengths D1 and D32; this brake shaft comprising grooves 39 which cooperate with the grooves 15 of the cylinder block 8 to make integral, vis-à-vis the axis rotation 10, the cylinder blocks 8 and the brake shaft 37; an axial recess 40, passing entirely through said brake shaft 37 and, in this case, coaxial with the axis 10; and a cylindrical end bearing 41;
• a brake housing cover 42 having a through bore 42A, slidably mounted, parallel to the axis 10, with respect to the cylindrical surface 41 and with respect to a bore 43 which comprises the peripheral part 32 of the brake housing;
• seals 44, 45, 46: the seal 44 being interposed between the bore 42A of the cover 42 and the cylindrical surface 41; the seal 45 being interposed between the cover 42 and the bore 43; and, the seal 46 being interposed between the brake shaft 37 and the axial bore of the cylinder block 8, the assembly of the shaft brake 37, of the peripheral part 32 of the brake housing and of the cover 42 delimiting a sealed chamber 47;
• a conduit 48, formed in the peripheral part 32 of the brake housing, connecting the chamber 47 to an external conduit 49 capable of containing a fluid under pressure or of being on the contrary placed in communication with a reservoir of fluid without pressure;
• brake discs integral with respect to the rotation, the brake discs 50 of the brake shaft 37, the brake discs 51 of the peripheral part 32 of the brake housing, the brake discs 50, 51 being alternating and constituting a stack of brake discs disposed opposite a transverse thrust face 52, belonging to the cover 42;
• an adaptation flange 53, which is fixed to the peripheral part 32 of the brake housing by screws 54, while being placed in abutment on the end face 34 of said peripheral part 32, this adaptation flange 53 having a axial bore 55, axis 10, and threads 56 allowing the attachment of a structure, such as the casing 79 of another hydraulic motor 76;
• an elastic washer 57 is supported on the internal transverse face 58 of the adaptation flange 53 and tends to push the cover 42 in the direction bearing the face 52 of this cover on the end of the stack of discs 50, 51, that is to say in the direction leading to braking, the action of the washer 57 being antagonistic to that of the pressure of the fluid possibly contained in the chamber 47, which allows the release of the brake discs 50, 51.

It should be observed that the brake shaft 37 passes entirely through the engine, in particular its cylinder block 8 and its internal fluid distributor 21, and, the brake, including the cover 42 of its casing (32-42). In addition, the axial recess 40 itself passing entirely through the brake shaft 37, it is possible to pass a connection, such as a motion transmission shaft, through the assembly of the motor and the brake, passing through the axial recess 40, as described in the application example shown in Figure 2.

FIG. 2 schematically represents the two cylindrical compacting rollers 59, 60 of a compactor.

• un bâti 61 ;
• deux bras latéraux 62 fixés (63) sur le bâti 61 ;
• deux moteurs hydrauliques principaux 64, 65, l'un d'eux 64, appartenant à l'ensemble décrit en regard de la figure 1;
• le carter 66 du moteur hydraulique 65, constituant son stator, est fixé (67) sur l'un des bras latéraux 62, cependant que le rotor 68 du moteur hydraulique 65, monté rotatif par rapport au stator au moyen d'un palier 69, est rendu solidaire (70) vis-à-vis d'une rotation d'axe 10 d'une plaque 71 reliée à un voile transversal 72 que comporte le rouleau de compactage 59 par l'intermédiaire de plots élastiques 73 d'isolation vibratoire ;
• le moteur 64, dont l'élément périphérique 1A-1B comporte une plaque 74 reliée au deuxième bras latéral 62 par l'intermédiaire de plots élastiques 75, et dont l'élément central 8 est fixé (77) sur un voile transversal 78 que comporte le rouleau de compactage 60 ;
• un troisième moteur 76 a son stator 79 fixé (87) sur la bride d'adaptation 53, constituant donc une bride intermédiaire entre l'élément périphérique 1A-1B du moteur 64 et ledit stator 79, et a son rotor 80 rendu solidaire (83), vis-à-vis de la rotation, d'un arbre 81 qui s'étend à l'intérieur des rouleaux de compactage 59, 60, notamment entre leurs voiles transversaux 72, 78, qui le supportent par l'intermédiaire de paliers 82, lesdits stator 79 et rotor 80 étant montés à rotation relative par un palier 86 ; et l'arbre 81 traversant l'ensemble du moteur 64 et du frein qui y est accouplé, en traversant l'évidement axial 40 de l'arbre de frein 37 ;
• une masse 84, excentrée par rapport à l'axe 10, est solidaire de l'arbre 81 ;
• un palier 85 est en outre interposé entre des extrémités 59A, 60A, qui se chevauchent, des deux rouleaux de compactage 59, 60.

This compactor includes:

• a frame 61;
• two lateral arms 62 fixed (63) on the frame 61;
• two main hydraulic motors 64, 65, one of them 64, belonging to the assembly described with reference to FIG. 1;
• the casing 66 of the hydraulic motor 65, constituting its stator, is fixed (67) to one of the lateral arms 62, while the rotor 68 of the hydraulic motor 65, mounted rotatably relative to the stator by means of a bearing 69, is made integral (70) vis-à-vis an axis rotation 10 of a plate 71 connected to a transverse web 72 that comprises the compacting roller 59 by means of elastic pads 73 of vibration isolation;
• the motor 64, whose peripheral element 1A-1B comprises a plate 74 connected to the second lateral arm 62 by means of elastic studs 75, and whose central element 8 is fixed (77) on a transverse web 78 which comprises the compacting roller 60;
• a third motor 76 has its stator 79 fixed (87) on the adaptation flange 53, therefore constituting an intermediate flange between the peripheral element 1A-1B of the motor 64 and said stator 79, and has its rotor 80 made integral (83 ), with respect to the rotation, of a shaft 81 which extends inside the compacting rollers 59, 60, in particular between their transverse webs 72, 78, which support it by means of bearings 82, said stator 79 and rotor 80 being mounted in relative rotation by a bearing 86; and the shaft 81 passing through the assembly of the motor 64 and the brake which is coupled thereto, passing through the axial recess 40 of the brake shaft 37;
• a mass 84, eccentric with respect to the axis 10, is integral with the shaft 81;
• a bearing 85 is also interposed between ends 59A, 60A, which overlap, of the two compacting rollers 59, 60.

• chacun des trois moteurs 64, 65 et 76, de la figure 2 est monté rotatif autour du même axe 10 ;
• les entraînements des deux rouleaux de compactage 59, 60 sont réalisés sans aucune interposition d'éléments d'engrenages, notamment par fixation directe du rotor 68 sur la plaque 70, du rotor 8 sur le voile 78, et du rotor 80 sur l'arbre 81 ;
• dans le moteur 64, identique à celui de la figure 1, l'élément central 8 est constitué par le bloc-cylindres, l'élément périphérique 1A-1B constituant le carter : les dispositions de l'invention s'appliqueraientaussi bien à un moteur dont l'élément périphérique serait constitué par un bloc-cylindres, l'élément central étant alors constitué par la came ;
• pour parvenir à réaliser des entraînements directs, donc simples, les moteurs hydrauliques 64, 65 ont été choisis parmi les moteurs dits à vitesse lente et à couple élevé ;
• le moteur 76 effectivement adopté est un moteur hydraulique à vitesse élevée et à faible couple ; ce moteur est avantageusement de type hydraulique, car le circuit d'alimentation des moteurs principaux 64, 65 n'est pas rendu beaucoup plus complexe par la prévision de l'alimentation en fluide d'un troisième moteur 76 ; le moteur 76 pourrait cependant en variante ne pas être de type hydraulique (être électrique, par exemple) ;
• sur la figure 2, le frein 50, 51 et l'arbre de frein 37 de l'ensemble auquel appartient le moteur 64 n'ont pas été représentés, mais existent bien.

The following observations should be made:

• each of the three motors 64, 65 and 76 of Figure 2 is rotatably mounted about the same axis 10;
• the drives of the two compaction rollers 59, 60 are produced without any interposition of gear elements, in particular by direct fixing of the rotor 68 on the plate 70, of the rotor 8 on the web 78, and of the rotor 80 on the shaft 81;
• in the engine 64, identical to that of FIG. 1, the central element 8 is constituted by the cylinder block, the peripheral element 1A-1B constituting the casing: the provisions of the invention would apply equally to an engine whose peripheral element would be constituted by a cylinder block, the central element then being constituted by the cam;
• to achieve direct drives, therefore simple, hydraulic motors 64, 65 have been chosen from so-called slow speed motors and high torque;
• the motor 76 actually adopted is a high speed, low torque hydraulic motor; this motor is advantageously of the hydraulic type, since the supply circuit of the main motors 64, 65 is not made much more complex by the provision of the fluid supply of a third motor 76; the motor 76 could however alternatively not be of the hydraulic type (being electric, for example);
• in FIG. 2, the brake 50, 51 and the brake shaft 37 of the assembly to which the motor 64 belongs have not been shown, but do exist.

It can be seen that the axial recess 40, which comprises the assembly of FIG. 1, allows the axial crossing of the motor and the brake by any element, such as the shaft 81 of FIG. 2, this element which may be other than a drive shaft and which may, for example, in certain different applications be constituted by pipes or measuring instruments. The seals 44, 45, 46 ensure satisfactory operation of the assembly, while the adapter flange 53, which allows the adaptation of any third motor 76 driving the shaft 81, also acts as a starting support for the elastic washer 57.

The invention is not limited to the embodiment described, but on the contrary covers all the variants which could be made to it without departing from its scope as defined by the appended claims.

In particular, it also applies to assemblies, in which the peripheral part 32 of the brake housing is in one piece with part 1B of the peripheral element of the motor housing, assemblies, of course provided with a removable cover 42 (removable fixing by the 'intermediate flange 53 and screws 54); and assemblies, in which the brake housing is in one piece (peripheral part 32 and cover 42 in one piece), fixed to part 1B of the motor housing by means of a removable fixing.

Claims (6)

1. Assembly of a hydraulic motor and of a brake which is coupled thereto, comprising:

   - a central motor element (8) traversed by a first axial recess (15);

   - a peripheral motor element (1A-1B) mounted for relative rotation (3-4-11) with respect to said central motor element about an axis (10);

   - a brake shaft (37) which is fast (15-39), with respect to said relative rotation, with said central motor element (8) and which axially extends (D1-D32) concomittantly opposite the central motor element (8) and opposite the brake (32);

   characterized in that:

   a) the brake comprises a housing (32-42) of which at least a part (32) is fast (35) with the peripheral element (1A-1B) of the motor, and which itself comprises a bottom (42) disposed transversely with respect to the axis (10);

   b) the bottom (42) comprises a through bore (42A);

   c) the brake shaft (37) completely traverses the motor/brake assembly, and said bore (42A) in the bottom (42) of the brake housing;

   d) two O-rings (46, 44) are interposed between the brake shaft (37) and, on the one hand, the first recess (15) of the central element (8) of the motor, on the other hand, said bore (42A) in the bottom (42) of the brake housing, respectively;

   e) the brake shaft (37) comprises a second recess (40) traversing it completely.
2. Assembly according to claim 1, characterized in that the brake housing (32-42) comprises a peripheral part (32) which is fast (35) with the peripheral element (1A-1B) of the motor, and a closure lid (42), distinct from said peripheral part (32) and constituting said bottom (42).
3. Assembly according to claim 2, characterized in that an adaptation flange (53) is fixed (54) on the peripheral part (32) of the brake housing, while said brake housing lid (42) constitutes, in addition, a member (52) for pushing braking members (50-51) that the brake comprises, an elastic return member (57) being interposed between the brake housing lid (42) and said adaptation flange (53).
4. Compactor comprising at least one assembly according to claim 1, characterized in that it further comprises:

   - two distinct cylindrical compaction rollers (59, 60) mounted to rotate about a common geometrical axis (10);

   - two principal hydraulic motors (64, 65) for driving said rollers, one (65) of these two principal hydraulic motors being coupled between the frame (61-62) of the compactor and one (59) of said compaction rollers, the other principal hydraulic motor (64) being coupled between the frame (61-62) of the compactor and the other compaction roller (60), a first (64) of said principal hydraulic motors forming part of an assembly according to any one of claims 1 to 3;

   - an eccentric mass (84) with respect to said geometrical axis (10); and

   - a third motor (76) for driving said eccentric mass, coupled between the frame (62-75-53) of the compactor and said mass, and comprising two elements (79, 80) mounted for relative rotation with respect to each other; and

   in that, on the one hand, a first (79) of said elements of the third motor (76) is rendered fast, with respect to rotation, with the peripheral element (1A-1B) of the first principal hydraulic motor (64), on the other hand, the second (80) of said two elements of the third motor is rendered fast (83), with respect to rotation, with a shaft (81) which traverses the second recess (40) made in the brake shaft (37) of the brake belonging to said assembly of which said first principal hydraulic motor (64) forms part.
5. Compactor according to claim 4, characterized in that said first element (79) of the third motor (76) is rendered fast, with respect to rotation, with the peripheral element of the first principal hydraulic motor by means of an intermediate flange (53), distinct from said third motor (76) and first principal hydraulic motor (64).
6. Compactor according to claim 5, characterized in that an adaptation flange (53) is fixed on the peripheral part (32) of the brake housing, while said brake housing lid (42) further constitutes a member (52) for pushing braking members (50-51) that the brake comprises, an elastic return member (57) being interposed between the brake housing lid (42) and said adaptation flange (53), and in that the intermediate flange being constituted by said adaptation flange.

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