EP3406901A1 - Hydraulic device comprising an improved distributor - Google Patents

Hydraulic device comprising an improved distributor Download PDF

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Publication number
EP3406901A1
EP3406901A1 EP18173896.4A EP18173896A EP3406901A1 EP 3406901 A1 EP3406901 A1 EP 3406901A1 EP 18173896 A EP18173896 A EP 18173896A EP 3406901 A1 EP3406901 A1 EP 3406901A1
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EP
European Patent Office
Prior art keywords
core
distribution ring
ring
stop
axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18173896.4A
Other languages
German (de)
French (fr)
Other versions
EP3406901B1 (en
Inventor
Bertrand BONNOMET
Maxime MAURER
Stéphane Vidal
Christophe Gouzou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Poclain Hydraulics Industrie
Original Assignee
Poclain Hydraulics Industrie
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Publication of EP3406901A1 publication Critical patent/EP3406901A1/en
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Classifications

    • 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
    • F04B1/0452—Distribution members, e.g. valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/0403—Details, component parts specially adapted of such engines
    • F03C1/0435—Particularities relating to the distribution members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/047—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement the pistons co-operating with an actuated element at the outer ends of the cylinders
    • F03C1/0472—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement the pistons co-operating with an actuated element at the outer ends of the cylinders with cam-actuated distribution members
    • 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
    • F04B1/047—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the outer ends of the cylinders
    • F04B1/0472—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the outer ends of the cylinders with cam-actuated distribution members

Definitions

  • This presentation relates to hydraulic devices, and more specifically the distributors for hydraulic devices.
  • one of the two parts of the distributor is supported on the cylinder block of the engine, while the other part is carried by the engine structure.
  • the relative positioning of the two parts is limited by the support of the distributor on the cylinder block of the engine.
  • the different layouts of shapes and conduits arranged in the core and in the distribution ring allow a relative movement of the internal distributor with respect to the distribution ring which can lead to the fall of sealing elements when the distributor has not yet been assembled to other components forming a hydraulic apparatus.
  • This presentation aims to answer at least partially this problem.
  • the present disclosure relates to a distributor for hydraulic apparatus, comprising a core and a dispensing ring mounted to rotate around the core along an axis defining a proximal end and a distal end, the dispensing ring and the core being slidably mounted.
  • the core having a plurality of internal grooves opening into an outer periphery of the core, the distribution ring having a plurality of external grooves opening into an inner periphery of the distribution ring, said internal and external grooves being configured to be placed in fluid communication and to form fluid circulation ducts, the core comprising a plurality of sealing segments configured to isolate each of said fluid flow conduits, the core having an outer section decreasing from a distal end to a proximal end, the dispenser being characterized in that one of the core and the dispensing ring comprises an abutment configured to engage a wall of the other of the core and the dispensing ring to limit the movement of the core relative to the distribution ring in a direction defined by the axis.
  • said stop is configured to limit displacement along the axis of the core relative to the dispensing ring, from the distal end to the proximal end.
  • each of said core sealing segments is positioned in a housing provided in the core, and bears against an inner face of the distribution ring, and the stop is configured to limit the displacement of the core relative to to the dispensing ring in a direction defined by the axis so that the distance between the proximal sealing segment and the proximal clearance of the dispensing ring remains non-zero, the proximal sealing segment being the sealing segment the closest along the axis of the proximal end of the nucleus, and the proximal clearance of the crown of distribution being defined as the first variation of section of the inner surface of the dispensing ring bearing against the proximal sealing segment, towards a proximal end of the distribution ring.
  • Said abutment is then typically integral with the distribution ring, and is configured to come into contact with a wall of the core.
  • said abutment is integral with the core, and is configured to come into contact with a wall of the distribution ring.
  • the present disclosure also relates to a hydraulic device with radial pistons and multilobe cam, comprising a distributor as defined above, in which there is a non-zero clearance along the axis between the stopper of the distributor and a surface of the core disposed opposite the stop.
  • the present disclosure further relates to a method of assembling a hydraulic apparatus on a wheel rocket, wherein positioning a first set of components of the hydraulic apparatus about an axis of the wheel spindle, a distributor as defined above is provided, the dispenser is positioned in abutment with components of the first set of components, so as to define a non-zero clearance along an axis of the wheel spindle between the stopper of the distributor and a surface of the core disposed facing the abutment, the kernel is joined to a component of the first set of components, positioning a second set of components of the hydraulic apparatus, so as to define an internal housing volume in which the distributor is positioned.
  • the figure 1 shows a hydraulic system comprising a housing 10 in which is disposed a hydraulic apparatus 12, a shaft 14 engaged in the housing 10 and a sealing device 16 between the shaft and the housing.
  • the shaft 14 and the casing 10 are rotatably mounted relative to one another about an axis A.
  • the shaft 14 is typically a wheel axle shaft of a vehicle, the hydraulic apparatus 12 then typically performing the rotational drive of a vehicle wheel.
  • the hydraulic apparatus 12 as shown comprises a cylinder block 12A, a cam 12B and a fluid distributor 40.
  • the cam 12B may be a multilobed cam. It is therefore, with the housing, a hydraulic motor or a pump.
  • This hydraulic apparatus 12 may in particular be radial pistons.
  • the cylinders of the cylinder block 12A are supplied with fluid from a fluid dispensed by the distributor 40 via grooves which will be described later.
  • the distributor 40 is itself connected to the main pipes 1 and 2, respectively for the supply and the exhaust of the hydraulic apparatus 12.
  • the hydraulic apparatus 12 may be of the cylinder block type 12A fixed and rotating housing 10, and the supply and exhaust pipes 1 and 2 pass through the shaft 14 of the wheel axle, in which they are oriented axially, that is to say parallel to the axis A of rotation, axis in which the shaft 14 is oriented.
  • another pipe 3 is axially pierced in the shaft 14. It is a fluid supply pipe, which serves to bring the fluid to the inner space 11 of the housing 10, in particular to put this space under pressure in order to favor the disengaging the pistons from the hydraulic apparatus, and for evacuating this fluid when the pistons and the cam 12B are brought into contact.
  • the pipe 3 allows a supply of fluid into the inner space 11 of the housing so as to cause a rise in pressure causing a retraction of the pistons in the cylinders of the cylinder block 12A so that the pistons are more in contact with the cam 12B, thus operating what is called a declutching of the hydraulic apparatus 10 and to put the motor in freewheel configuration.
  • the fact of bringing the pistons into contact with the cam 12B is called a interconnection or a displacement of the hydraulic apparatus 10.
  • the fluid brought by the pipe 3 arrives between the faces opposite the distributor 40 and of the shaft 14 and flows to the inner space 11 of the housing 10, for example by a dedicated connection, or by a clearance formed on a portion of the grooves between the shaft 14 and the cylinder block 12A.
  • the shaft has only three axial sections of fluid conduit, namely two main sections that form all or part of the main supply and exhaust pipes 1 and 2 and an auxiliary section that forms all or part of the pipe 3 for pressurizing the housing.
  • This auxiliary section typically forms a drain line of the internal volume 11 of the housing 10 when the hydraulic apparatus 12 is in operation.
  • the cam 12B forms a portion of the housing 10, which also comprises a cover 10A located around the distributor 40 and secured to the cam 12B, typically by bolting, and a portion 10B forming for example a flange for connection with a member driven by the motor, for example the hub of a wheel.
  • the housing 10 is extended by a portion 10C, which may for example be engaged in the hub of a wheel.
  • the casing 10 and the shaft 14 are mounted in relative rotation. For this reason, they cooperate with each other via bearings 18A and 18B, housed in this case in part 10C of the housing. In known manner, these bearings 18A and 18B may be bearings with tapered bearings.
  • the system can be used to drive a wheel of a vehicle, in which case the shaft 14 can be a wheel axle.
  • the distributor 40 comprises a distribution ring 60 and a core 50, the distribution ring 60 and the core 50 are relative rotational movement.
  • the distribution ring 60 is relatively rotational relative to the cylinder block 12A, while the core 50 is secured to the shaft 14, typically by bolting.
  • the Figures 2 and 3 are detailed views of the dispenser 40 shown on the figure 1 .
  • a proximal end 40P and a distal end 40D are defined, the proximal end 40P being arbitrarily defined as being the end of the dispenser 40 closest to the shaft 14.
  • a proximal end 50P, 60P and a distal end 60P, 60D are defined for the core 50 and for the distribution ring 60 .
  • the proximal end 50P of the core 50 forms the proximal end 40P of the dispenser 40
  • the distal end 60D of the dispensing ring 60 forms the distal end 40D of the dispenser 40.
  • the core 50 is inserted via its proximal end 50P into the dispensing ring 60 from the distal end 60D, and slides in an internal volume of the dispensing ring 60 towards the proximal end 60P, for example until protruding from its proximal end 60P.
  • the core 50 thus has a decreasing external section from its distal end 50D to its proximal end 50P, while the distribution ring 60 defines an internal housing delimited by an internal section whose section decreases from the distal end 60D towards the end. proximal 60P.
  • These forms typically allow to obtain an axial thrust, and therefore the support of the surface 60P of the distribution ring 60 on the cylinder block 12A, when the grooves 60A and 60B are placed in hydraulic pressure.
  • the distributor 40 comprises feed ducts 41 and 42 formed in the core 50, which are only primed in the figures, and which, on the one hand, open on the radial face of the internal distributor 50 turned towards the shaft 14 , so as to face the ends of the pipes 1 and 2 located at this end of the shaft 14 and which, on the other hand, are connected to distribution grooves arranged in the core 50 and in the distribution ring 60.
  • Distribution ducts open radially on the face forming the end proximal 60P of the distribution ring 60 so as to connect the outer grooves 60A and 60B to the cylinder block 12A of the hydraulic apparatus 12, so as to selectively supply each chamber of the cylinder block 12A of the hydraulic apparatus 12 during its rotation.
  • the core 50 thus has internal grooves 50A and 50B opening into its outer periphery, and connected to the feed ducts 41 and 42.
  • the distribution ring 60 has external grooves 60A and 60B opening into the inner periphery of the outer ring. 60, and configured to be each in fluid communication with at least one inner groove of the core 50.
  • the outer grooves 60A and 60B arranged in the distribution ring 60 are connected to ducts opening on the radial face of the distribution ring 60 facing the cylinder block 12A, so as to ensure the supply and discharge of fluid.
  • the communication between the main ducts 1 and 2 and the supply ducts 41 and 42 is sealed vis-à-vis the rest of the system by any appropriate sealing means, for example by annular seals 31 and 32 disposed between the faces facing the core 50 and the shaft 14, or segments, or joint compositions and segments.
  • the core 50 comprises a plurality of grooves 51 in which are arranged segments 52 ensuring a sealing contact between the core 50 and the distribution ring 60, and thus isolating the various ducts made in the distributor 40. one with respect to the others, and with respect to the environment outside the throats.
  • Each groove of the distributor 40 is therefore framed with segments.
  • each internal groove 50A and 50B of the core 50 is flanked by two pairs of grooves 51 and segments 52.
  • the sealing means 52 are typically placed in the mounting in the grooves 51 by stretching to increase their diameter. Then they are placed in the grooves 51. Then, the core 50 is placed in the ring 60, and the sealing means 52 are supported on the inner wall of the ring 60. This allows to have a movement, in particular essentially axial sliding along the axis AA between the core and the crown, while obtaining the tightness of the grooves 50A and 50B.
  • a recurring problem when assembling the hydraulic apparatus is the holding in position of the segments 52 in the grooves 51 when the distributor 40 is handled individually, or more generally when the distributor 40 is not mounted in abutment against other components of hydraulic apparatus. Indeed, it is understood that if the core 50 slides in the distribution ring 60 during its handling to put it in position, there is a risk that segments out of the internal volume defined by the distribution ring 60, and disengage , especially at the proximal end 50P of the core 50.
  • the distributor 40 as proposed comprises a stop 65 formed in or carried by the core 50 or by the distribution ring 60, configured so as to limit the displacement of the core relative to the distribution ring in a direction defined by the axis A. It will be referred thereafter in general to a stop 65. It is understood that the distribution ring 60 may have a single stop, several similar stops arranged around the axis A, or another annular, the operation then remaining unchanged.
  • This abutment 65 extends from the inner surface of the distribution ring 60, so as to come into contact with a wall of an internal groove 50A or 50B of the core 50 and thus limit the displacement of the core 50 with respect to the distribution ring 60 along the axis A in a direction from the distal end 40D to the proximal end 40P of the distributor 40.
  • the abutment 65 is typically a rib or shoulder extending from the inner surface of the distribution ring 6.
  • the abutment is typically an insert, such as a pin, inserted into an internal groove of the core 50 as will be seen later with reference to the various embodiments.
  • the abutment 65 is a shoulder formed in the inner wall of the distribution ring 60, configured to extend into the internal groove 50B when the core 50 is inserted into the distribution ring 60.
  • the stop 65 is configured so as not to come into contact with the core 50 once the hydraulic apparatus is assembled. More precisely, the stop 65 is thus configured so that it can come into contact with the core 50 only during the assembly of the hydraulic apparatus comprising the distributor 40.
  • the figure 2 is thus a detailed view of the distributor 40 shown on the figure 1 while the figure 3 is a view of the distributor 40 taken alone.
  • a non-zero functional clearance J remains between the abutment 65 and the surface of the core 50 facing the abutment 65, here a wall of the internal groove 50B.
  • This functional clearance results from the different contact surfaces of the core 50 and the distribution ring 60 with the other elements of the hydraulic apparatus 12, in particular with the shaft 14 and the cylinder block 12A.
  • the core 50 is no longer limited in translation by its contact with the shaft 14.
  • the stop 65 then makes it possible to limit the displacement of the core 50 with respect to the distribution ring 60 in a direction going from the distal end 60D towards the proximal end 60P of the distribution ring 60. More precisely, if we consider the position of the dispenser 40 represented on the figure 2 an additional displacement corresponding to the functional clearance J can occur when the distributor 40 is taken in isolation.
  • the stop 65 is configured to limit the displacement of the core 50 relative to the distribution ring 60 in order to prevent a segment 52 of the core 50 from extending beyond the proximal end 60P of the distribution ring 60, or more precisely do sort of the distribution ring 60.
  • the sealing segment 52 closest to the proximal end 50P of the core 50 is considered here.
  • the distribution ring 60 has an internal surface facing this segment 52. For this inner surface of the crown, it is defined. 60 a proximal clearance 63, corresponding to the first section variation of the inner surface of the distribution ring facing the segment 52, towards the proximal end 60P of the distribution ring 60.
  • this proximal clearance 63 corresponds to a section of the distribution ring 60 that does not necessarily ensure that the segment 52 is held in its housing 51 of the core 50.
  • the stop 65 is configured so that the distance measured along the axis A between the proximal clearance 63 and the closest segment (along the axis A) of the proximal end 50P of the core 50 remains non-zero, and therefore of so that the segment 52 can not go beyond the proximal clearance 63.
  • the segment 52 closest to the proximal end 50P of the core 50 remains held in place by the inner surface of the distribution ring 60.
  • the proximal clearance 63 corresponds to the proximal end 60P of the distribution ring 60.
  • the stop 65 is then configured so that the length (measured along the axis A) of the portion of the core 50 that can project from the proximal end 60P of the distribution ring 60 is strictly less than the distance (measured along the axis A) between the proximal end 50P of the core 50 and the segment 51 closest to said end 50P proximal of the nucleus 50.
  • the user will maintain the distributor 40 by its distal end 40P in order to come dispose of it against the shaft 14 and against the block cylinders 12A.
  • the user thus prevents disengagement via the distal end 40D, while the stop 65 prevents disengagement via the proximal end 40P.
  • the user can then secure the core 50 to the shaft 14, for example by bolting, which fixes the distributor 40 and then prevents any risk of subsequent fall before positioning the remaining elements of the system.
  • the segments 52 are held together between the core 50 and the distribution ring 60, which prevents any risk of accidental loss or fall of a segment.
  • the figure 4 presents a variant of the embodiment shown in the figure 3 .
  • the abutment 65 is here a shoulder extending from a radial wall of an external groove 60A. As for the embodiment described with reference to the figure 3 the abutment 65 comes into contact with a radial wall of an internal groove, here the internal groove 50A in order to limit the displacement of the core 50 relative to the distribution ring 60 in a direction from the distal end 60D towards the proximal end 60P of the distribution ring 60.
  • the Figures 5 to 9 are variants of embodiments of the dispenser.
  • the figure 5 represents a variant in which the stop 65 is formed by a shoulder extending from the outer periphery of the core 50 of the distributor 40. This shoulder forming a stop 65 then abuts against a radial surface of the distribution ring 60, in order to limit the displacement of the core 50 relative to the distribution ring 60 in a direction from the distal end 60D to the proximal end 60P of the distribution ring 60.
  • the shoulder as shown is formed adjacent to the internal groove 50B it is understood that it can also be formed adjacent to the internal groove 50A, the function then being performed identically.
  • the figure 6 represents another variant in which the stop 65 is formed at the proximal end 60P of the distribution ring 60.
  • This stop 65 thus limits the movement of the core 50, a radial wall of which comes into contact with the stop 65. The operation remains unchanged. Note that the stop 65 forms the proximal clearance 63, but ensures by its location that the segments can not leave the dispensing ring 60 by the proximal end.
  • the figure 7 represents another variant in which the stop 65 is formed by a screw inserted into a bore 66 formed in the distribution ring 60.
  • the bore 66 is formed so that the screw forming the abutment can be inserted into an internal groove, here the internal groove 50B.
  • the end of the screw penetrating into the internal groove here defines a limited axial displacement of the core 50 relative to the distribution ring 60 in both directions of the axis A.
  • the distributor 40 can not disassemble, particularly in the case of a used as a spare part that has been assembled before it is transported, which facilitates assembly on the hydraulic unit.
  • Sealing elements such as seals (not shown) are typically provided between the screw and the bore 66.
  • a functional clearance is typically provided radially between the free end of the screw forming the abutment 65 and the axial wall of the throat associated.
  • the figure 8 represents another variant in which a shoulder extends from the distal end 50D of the core 50.
  • This shoulder forms the abutment 65, and is configured to bear against a radial surface of the distribution ring 60 forming its distal end 60D , or near the distal end 60D.
  • the figure 9 represents another variant in which the stop 65 is formed by an insert positioned in a housing 67 formed in an internal groove, here the internal groove 50B.
  • the insert is for example a circlip, a ring, ring or half-ring segment, a pin or any other suitable element.
  • the stop 65 is formed by a pin.
  • this insert forms a stop 65 making it possible to limit the displacement of the core 50 relative to the distribution ring 60 in a direction going from the distal end 60D towards the proximal end 60P of the crown. 60.
  • a functional clearance is provided radially between the free end of the insert forming the abutment and the axial wall of the associated groove.
  • the stop 65 is formed on one of the core 50 and the distribution ring 60, and is adapted to come into contact with a surface of the other of the core 50 and 60.
  • the stop 65 is only used when assembling a hydraulic device. More generally, the stop 65 may be described as internal to the distributor 40, in that it does not require external elements to the distributor 40 to perform its function. Once the hydraulic device has been assembled, the stop 65 is no longer in contact with the core 50 in order to avoid generating additional friction between the core 50 and the distribution ring 60.
  • the dispenser 40 as proposed may also comprise a secondary abutment such as an elastic ring or a cover in order to limit the relative displacement of the core 50 relative to the distribution ring 60 in the other direction, namely a displacement of the core 50 in the direction from the proximal end 60P of the distribution ring 60 to the distal end 60D of the distribution ring 60.
  • the secondary stop is typically removable.
  • the figure 10 is a variant of the figure 4 , in which an elastic ring 7 is inserted into a groove 67 arranged near the distal end 60D of the distribution ring 60.
  • Such elastic rings are commonly referred to by the name "circlip”.
  • the elastic ring 7 here defines an abutment limiting the relative displacement of the core 50 with respect to the distribution ring 60 in the direction from the proximal end 60P of the distribution ring 60 to the distal end 60D of the crown. distribution 60; the distal end 50D of the core 50b then abuts against the elastic ring 7.
  • the figure 11 is another variant of the figure 4 , in which the elastic ring 7 is here positioned in a groove 57 provided in the core 50, near its proximal end 50P.
  • the elastic ring 7 defines a stop limiting the relative displacement of the core 50 relative to the distribution ring 60 in the direction from the proximal end 60P of the distribution ring 60 to the distal end 60D of the distribution ring 60; the elastic ring 7 then abuts against the proximal clearance 63 of the distribution ring 60.
  • the figure 12 presents another embodiment of the secondary abutment 7, which here has the shape of a cap.
  • the distribution ring 60 has an external groove 68 extending typically over its entire outer periphery, in which are engaged fixing lugs 71 of the cap 7.
  • the cap 7 here covers at least partially the distal end 60D of the crown distribution 60, so as to define a stop limiting the relative displacement of the core 50 relative to the distribution ring 60 in the direction from the proximal end 60P of the distribution ring 60 to the distal end 60D of the crown 60, the distal end 50D of the core 50 then coming into contact with the cap 7.
  • the cap 7 typically has one or more openings to allow the passage of bolts including the assembly of the core 50 and the crown of distribution 60 on the other components of a hydraulic device while keeping the cap 7 in place, the latter then being removed as a result of this assembly.
  • the figure 13 is an exemplary embodiment of such a cap 7.
  • an operator will initially position the bearings 18A and 18B and the housing segment 10C around the shaft 14, then the housing segment 10B. If the operator performs the assembly directly on a vehicle, the previous elements are already assembled and constitute a wheel spindle on a hub. The operator will then place the cylinder block 12A and the cam 12B. It will then bring the distributor 40 to position it in abutment against the shaft 14 and against the cylinder block 14A as indicated above (possibly having removed the secondary stop 7), the stop 65 thus providing a function of maintaining the segments 52 in position by keeping them sandwiched between the core 50 and the distribution ring 60. The operator then positions cover 10A which will maintain the distributor 40 in position.
  • the dispenser 40 as proposed thus facilitates the assembly operations of a hydraulic apparatus comprising such a dispenser, and thus avoids the risk of loss of time or damage to the distributor 40 resulting from a segment loss 52 linked excessive displacement of the core 50 relative to the distribution ring 60 while the distributor 40 has not yet been assembled to other components of hydraulic apparatus. These advantages also apply more generally for any transport operation, or involving manipulation of the distributor 40 before assembly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Automatic Assembly (AREA)
  • Sealing Devices (AREA)
  • Gasket Seals (AREA)

Abstract

Distributeur (40) pour appareil hydraulique, comprenant un noyau (50) et une couronne de distribution (60)
le noyau (50) présentant une pluralité de gorges internes (50A, 50B)
le couronne de distribution (60) présentant une pluralité de gorges externes (60A, 60B)
lesdites gorges internes (50A, 50B) et externes (60A, 60B) étant configurées pour être mises en communication fluidique et former des conduits de circulation de fluide,
le noyau (50) comprenant une pluralité de segments d'étanchéité (52) configurés de manière à isoler lesdits conduits de circulation de fluide,
le noyau (50) présentant une section externe décroissante depuis une extrémité distale (50D) vers une extrémité proximale (50P),
le distributeur (40) étant caractérisé en ce que le couronne de distribution (60) comprend une butée (65) configurée de manière à limiter le déplacement du noyau (50) par rapport au couronne de distribution (60) selon une direction définie par l'axe (A).

Figure imgaf001
Distributor (40) for hydraulic apparatus, comprising a core (50) and a timing ring (60)
the core (50) having a plurality of internal grooves (50A, 50B)
the distribution ring (60) having a plurality of external grooves (60A, 60B)
said internal (50A, 50B) and external grooves (60A, 60B) being configured to be in fluid communication and to form fluid flow conduits,
the core (50) comprising a plurality of sealing segments (52) configured to isolate said fluid flow conduits,
the core (50) having an outer section decreasing from a distal end (50D) to a proximal end (50P),
the distributor (40) being characterized in that the distribution ring (60) comprises a stop (65) configured to limit the displacement of the core (50) with respect to the distribution ring (60) in a direction defined by the axis (A).
Figure imgaf001

Description

DOMAINE DE L'INVENTIONFIELD OF THE INVENTION

Le présent exposé concerne les appareils hydrauliques, et plus précisément les distributeurs pour appareils hydrauliques.This presentation relates to hydraulic devices, and more specifically the distributors for hydraulic devices.

ETAT DE LA TECHNIQUE ANTERIEURESTATE OF THE PRIOR ART

On connaît plusieurs applications pour des appareils hydrauliques disposées sur des fusées d'essieu de véhicule, notamment pour l'entrainement de roues du véhicule.Several applications are known for hydraulic devices arranged on vehicle axle flares, in particular for driving the wheels of the vehicle.

En fonctionnement, une des deux parties du distributeur est en appui sur le bloc cylindre du moteur, tandis que l'autre partie est portée par la structure du moteur. Le positionnement relatif des deux pièces est limité par l'appui du distributeur sur le bloc cylindre du moteur.In operation, one of the two parts of the distributor is supported on the cylinder block of the engine, while the other part is carried by the engine structure. The relative positioning of the two parts is limited by the support of the distributor on the cylinder block of the engine.

Lors du montage de l'appareil hydraulique, une problématique récurrente intervient pour l'assemblage du distributeur. En effet, l'opérateur doit alors manipuler le distributeur comprenant un noyau et une couronne de distribution afin de le positionner par rapport aux autres composants de l'appareil hydraulique, par exemple au bout d'un arbre de fusée de roue. Toutefois, il y a alors un risque de coulissement du noyau dans la couronne de distribution qui va alors au-delà de sa position de fonctionnement nominale lorsque le noyau et la couronne de distribution sont en appui contre d'autres composants de l'appareil hydraulique, ce qui peut entrainer une chute de segments d'étanchéité, dans la mesure où le distributeur n'est alors pas maintenu en appui contre d'autres éléments de l'appareil hydraulique.When assembling the hydraulic unit, a recurring problem arises for the assembly of the distributor. Indeed, the operator must then manipulate the distributor comprising a core and a dispensing ring to position it relative to the other components of the hydraulic apparatus, for example at the end of a wheel spindle shaft. However, there is then a risk of sliding of the core in the distribution ring which then goes beyond its nominal operating position when the core and the distribution ring are in abutment against other components of the hydraulic apparatus , which can cause a fall of sealing segments, insofar as the dispenser is then not held in abutment against other elements of the hydraulic apparatus.

En effet, les différents étagements de formes et de conduits aménagés dans le noyau et dans la couronne de distribution autorisent un débattement relatif du distributeur interne par rapport à la couronne de distribution pouvant conduire à la chute d'éléments d'étanchéité lorsque le distributeur n'a pas encore été assemblé à d'autres composants formant un appareil hydraulique.Indeed, the different layouts of shapes and conduits arranged in the core and in the distribution ring allow a relative movement of the internal distributor with respect to the distribution ring which can lead to the fall of sealing elements when the distributor has not yet been assembled to other components forming a hydraulic apparatus.

Le présent exposé vise ainsi à répondre au moins partiellement à cette problématique.This presentation aims to answer at least partially this problem.

PRESENTATION DE L'INVENTIONPRESENTATION OF THE INVENTION

A cet effet, le présent exposé concerne un distributeur pour appareil hydraulique, comprenant un noyau et une couronne de distribution montée tournant autour du noyau selon un axe définissant une extrémité proximale et une extrémité distale, la couronne de distribution et le noyau étant monté coulissants l'un par rapport à l'autre selon l'axe,
le noyau présentant une pluralité de gorges internes débouchant dans une périphérie externe du noyau,
la couronne de distribution présentant une pluralité de gorges externes débouchant dans une périphérie interne de la couronne de distribution, lesdites gorges internes et externes étant configurées pour être mises en communication fluidique et former des conduits de circulation de fluide,
le noyau comprenant une pluralité de segments d'étanchéité configurés de manière à isoler chacun desdits conduits de circulation de fluide,
le noyau présentant une section externe décroissante depuis une extrémité distale vers une extrémité proximale,
le distributeur étant caractérisé en ce que l'un parmi le noyau et la couronne de distribution comprend une butée configurée de manière à venir au contact d'une paroi de l'autre parmi le noyau et la couronne de distribution afin de limiter le déplacement du noyau par rapport à la couronne de distribution selon une direction définie par l'axe.For this purpose, the present disclosure relates to a distributor for hydraulic apparatus, comprising a core and a dispensing ring mounted to rotate around the core along an axis defining a proximal end and a distal end, the dispensing ring and the core being slidably mounted. relative to each other along the axis,
the core having a plurality of internal grooves opening into an outer periphery of the core,
the distribution ring having a plurality of external grooves opening into an inner periphery of the distribution ring, said internal and external grooves being configured to be placed in fluid communication and to form fluid circulation ducts,
the core comprising a plurality of sealing segments configured to isolate each of said fluid flow conduits,
the core having an outer section decreasing from a distal end to a proximal end,
the dispenser being characterized in that one of the core and the dispensing ring comprises an abutment configured to engage a wall of the other of the core and the dispensing ring to limit the movement of the core relative to the distribution ring in a direction defined by the axis.

Selon un exemple, ladite butée est configurée de manière à limiter le déplacement selon l'axe du noyau par rapport à la couronne de distribution, de l'extrémité distale vers l'extrémité proximale.In one example, said stop is configured to limit displacement along the axis of the core relative to the dispensing ring, from the distal end to the proximal end.

En variante, chacun desdits segments d'étanchéité du noyau est positionné dans un logement aménagé dans le noyau, et est en appui contre une face interne de la couronne de distribution, et la butée est configurée de manière à limiter le déplacement du noyau par rapport à la couronne de distribution selon une direction définie par l'axe de sorte que la distance entre le segment d'étanchéité proximal et le dégagement proximal de la couronne de distribution demeure non nulle, le segment d'étanchéité proximal étant le segment d'étanchéité le plus proche selon l'axe de l'extrémité proximale du noyau, et le dégagement proximal de la couronne de distribution étant défini comme la première variation de section de la surface interne de la couronne de distribution en appui contre le segment d'étanchéité proximal, en direction d'une extrémité proximale de la couronne de distribution.In a variant, each of said core sealing segments is positioned in a housing provided in the core, and bears against an inner face of the distribution ring, and the stop is configured to limit the displacement of the core relative to to the dispensing ring in a direction defined by the axis so that the distance between the proximal sealing segment and the proximal clearance of the dispensing ring remains non-zero, the proximal sealing segment being the sealing segment the closest along the axis of the proximal end of the nucleus, and the proximal clearance of the crown of distribution being defined as the first variation of section of the inner surface of the dispensing ring bearing against the proximal sealing segment, towards a proximal end of the distribution ring.

Ladite butée est alors typiquement solidaire de la couronne de distribution, et est configurée de manière à venir au contact d'une paroi du noyau.Said abutment is then typically integral with the distribution ring, and is configured to come into contact with a wall of the core.

En variante, ladite butée est solidaire du noyau, et est configurée de manière à venir au contact d'une paroi de la couronne de distribution.Alternatively, said abutment is integral with the core, and is configured to come into contact with a wall of the distribution ring.

Le présent exposé concerne également un appareil hydraulique à pistons radiaux et came multilobes, comprenant un distributeur tel que défini précédemment, dans laquelle il existe un jeu non nul selon l'axe entre la butée du distributeur et une surface du noyau disposée en regard de la butée.The present disclosure also relates to a hydraulic device with radial pistons and multilobe cam, comprising a distributor as defined above, in which there is a non-zero clearance along the axis between the stopper of the distributor and a surface of the core disposed opposite the stop.

Le présent exposé concerne en outre un procédé d'assemblage d'un appareil hydraulique sur une fusée de roue, dans lequel
on positionne un premier ensemble de composants de l'appareil hydraulique autour d'un axe de la fusée de roue,
on fournit un distributeur tel que défini précédemment,
on positionne le distributeur en appui contre des composants du premier ensemble de composants, de manière à définir un jeu non nul selon un axe de la fusée de roue entre la butée du distributeur et une surface du noyau disposée en regard de la butée,
on solidarise le noyau à un composant du premier ensemble de composants,
on positionne un second ensemble de composants de l'appareil hydraulique, de manière à définir un volume interne de carter dans lequel est positionné le distributeur.The present disclosure further relates to a method of assembling a hydraulic apparatus on a wheel rocket, wherein
positioning a first set of components of the hydraulic apparatus about an axis of the wheel spindle,
a distributor as defined above is provided,
the dispenser is positioned in abutment with components of the first set of components, so as to define a non-zero clearance along an axis of the wheel spindle between the stopper of the distributor and a surface of the core disposed facing the abutment,
the kernel is joined to a component of the first set of components,
positioning a second set of components of the hydraulic apparatus, so as to define an internal housing volume in which the distributor is positioned.

BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

L'invention et ses avantages seront mieux compris à la lecture de la description détaillée faite ci-après de différents modes de réalisation de l'invention donnés à titre d'exemples non limitatifs. Cette description fait référence aux pages de figures annexées, sur lesquelles :

  • la figure 1 représente une vue d'ensemble d'un appareil hydraulique comprenant un distributeur selon un aspect de l'invention,
  • les figures 2, 3 et 4 sont des vues détaillées de modes de réalisation du distributeur,
  • les figures 5 à 13 sont des variantes de modes de réalisation du distributeur.
The invention and its advantages will be better understood on reading the detailed description given below of various embodiments of the invention given as non-limiting examples. This description refers to the pages of annexed figures, in which:
  • the figure 1 represents an overview of a hydraulic apparatus comprising a dispenser according to one aspect of the invention,
  • the Figures 2, 3 and 4 are detailed views of embodiments of the dispenser,
  • the Figures 5 to 13 are variants of embodiments of the dispenser.

Sur l'ensemble des figures, les éléments en commun sont repérés par des références numériques identiques.In all the figures, the elements in common are identified by identical reference numerals.

DESCRIPTION DETAILLEE D'EXEMPLES DE REALISATIONDETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

La figure 1 montre un système hydraulique comprenant un carter 10 dans lequel est disposé un appareil hydraulique 12, un arbre 14 engagé dans le carter 10 et un dispositif d'étanchéité 16 entre l'arbre et le carter. L'arbre 14 et le carter 10 sont montés mobiles en rotation l'un par rapport à l'autre autour d'un axe A. L'arbre 14 est typiquement un arbre de fusée de roue d'un véhicule, l'appareil hydraulique 12 réalisant alors typiquement l'entrainement en rotation d'une roue de véhicule.The figure 1 shows a hydraulic system comprising a housing 10 in which is disposed a hydraulic apparatus 12, a shaft 14 engaged in the housing 10 and a sealing device 16 between the shaft and the housing. The shaft 14 and the casing 10 are rotatably mounted relative to one another about an axis A. The shaft 14 is typically a wheel axle shaft of a vehicle, the hydraulic apparatus 12 then typically performing the rotational drive of a vehicle wheel.

L'appareil hydraulique 12 tel que représenté comprend un bloc-cylindres 12A, une came 12B et un distributeur 40 de fluide. La came 12B peut être une came multilobes. Il s'agit donc, avec le carter, d'un moteur hydraulique ou d'une pompe. Cet appareil hydraulique 12 peut être en particulier à pistons radiaux.The hydraulic apparatus 12 as shown comprises a cylinder block 12A, a cam 12B and a fluid distributor 40. The cam 12B may be a multilobed cam. It is therefore, with the housing, a hydraulic motor or a pump. This hydraulic apparatus 12 may in particular be radial pistons.

De manière connue en soi, les cylindres du bloc-cylindres 12A sont alimentés en fluide à partir d'un fluide distribué par le distributeur 40, via des gorges que l'on décrira par la suite.In a manner known per se, the cylinders of the cylinder block 12A are supplied with fluid from a fluid dispensed by the distributor 40 via grooves which will be described later.

Le distributeur 40 est lui-même relié à des conduites principales 1 et 2, respectivement pour l'alimentation et l'échappement de l'appareil hydraulique 12. En l'espèce, l'appareil hydraulique 12 peut être du type à bloc-cylindres 12A fixe et à carter 10 tournant, et les conduites d'alimentation et d'échappement 1 et 2 passent par l'arbre 14 de la fusée de roue, dans lequel elles sont orientées axialement, c'est-à-dire parallèlement à l'axe A de rotation, axe selon lequel l'arbre 14 est orienté.The distributor 40 is itself connected to the main pipes 1 and 2, respectively for the supply and the exhaust of the hydraulic apparatus 12. In this case, the hydraulic apparatus 12 may be of the cylinder block type 12A fixed and rotating housing 10, and the supply and exhaust pipes 1 and 2 pass through the shaft 14 of the wheel axle, in which they are oriented axially, that is to say parallel to the axis A of rotation, axis in which the shaft 14 is oriented.

Dans l'exemple représenté, une autre conduite 3 est percée axialement dans l'arbre 14. Il s'agit d'une conduite d'amenée de fluide, qui sert à amener le fluide vers l'espace intérieur 11 du carter 10, en particulier pour mettre cet espace en pression de manière à favoriser le désengagement des pistons de l'appareil hydraulique, et pour évacuer ce fluide lors de la mise au contact des pistons et de la came 12B.In the example shown, another pipe 3 is axially pierced in the shaft 14. It is a fluid supply pipe, which serves to bring the fluid to the inner space 11 of the housing 10, in particular to put this space under pressure in order to favor the disengaging the pistons from the hydraulic apparatus, and for evacuating this fluid when the pistons and the cam 12B are brought into contact.

Plus précisément, la conduite 3 permet de réaliser une amenée de fluide dans l'espace intérieur 11 du carter de manière à y entraîner une montée en pression entraînant une rétractation des pistons dans les cylindres du bloc-cylindres 12A de sorte que les pistons ne soient plus en contact avec la came 12B, opérant ainsi ce que l'on nomme un décrabotage de l'appareil hydraulique 10 et permettant de mettre le moteur en configuration de roue libre. A l'inverse, le fait de ramener les pistons au contact de la came 12B est nommé un crabotage ou une mise en cylindrée de l'appareil hydraulique 10. Le fluide amené par la conduite 3 parvient entre les faces en regard du distributeur 40 et de l'arbre 14 et circule vers l'espace intérieur 11 du carter 10, par exemple par une liaison dédiée, ou bien par un jeu ménagé sur une partie des cannelures entre l'arbre 14 et le bloc-cylindres 12A.Specifically, the pipe 3 allows a supply of fluid into the inner space 11 of the housing so as to cause a rise in pressure causing a retraction of the pistons in the cylinders of the cylinder block 12A so that the pistons are more in contact with the cam 12B, thus operating what is called a declutching of the hydraulic apparatus 10 and to put the motor in freewheel configuration. Conversely, the fact of bringing the pistons into contact with the cam 12B is called a interconnection or a displacement of the hydraulic apparatus 10. The fluid brought by the pipe 3 arrives between the faces opposite the distributor 40 and of the shaft 14 and flows to the inner space 11 of the housing 10, for example by a dedicated connection, or by a clearance formed on a portion of the grooves between the shaft 14 and the cylinder block 12A.

On voit ainsi que l'arbre présente seulement trois tronçons axiaux de conduite de fluide, à savoir deux tronçons principaux qui forment tout ou partie des conduites principales d'alimentation et d'échappement 1 et 2 et un tronçon auxiliaire qui forme tout ou partie de la conduite 3 de mise en pression du carter. Ce tronçon auxiliaire forme typiquement une conduite de drain du volume interne 11 du carter 10 lorsque l'appareil hydraulique 12 est en fonctionnement.It can be seen that the shaft has only three axial sections of fluid conduit, namely two main sections that form all or part of the main supply and exhaust pipes 1 and 2 and an auxiliary section that forms all or part of the pipe 3 for pressurizing the housing. This auxiliary section typically forms a drain line of the internal volume 11 of the housing 10 when the hydraulic apparatus 12 is in operation.

La came 12B forme une partie du carter 10, qui comprend également un couvercle 10A situé autour du distributeur 40 et solidarisé à la came 12B, typiquement par boulonnage, et une partie 10B formant par exemple une bride pour la connexion avec un organe entraîné par le moteur, par exemple le moyeu d'une roue. Du côté opposé à l'appareil hydraulique 12, le carter 10 est prolongé par une partie 10C, qui peut par exemple être engagée dans le moyeu d'une roue. Le carter 10 et l'arbre 14 sont montés en rotation relative. Pour cette raison, ils coopèrent l'un avec l'autre via des paliers 18A et 18B, logés en l'espèce dans la partie 10C du carter. De manière connue, ces paliers 18A et 18B peuvent être des paliers à roulements coniques. Le système peut servir à l'entraînement d'une roue d'un véhicule, auquel cas l'arbre 14 peut être un axe de fusée de roue.The cam 12B forms a portion of the housing 10, which also comprises a cover 10A located around the distributor 40 and secured to the cam 12B, typically by bolting, and a portion 10B forming for example a flange for connection with a member driven by the motor, for example the hub of a wheel. On the opposite side to the hydraulic apparatus 12, the housing 10 is extended by a portion 10C, which may for example be engaged in the hub of a wheel. The casing 10 and the shaft 14 are mounted in relative rotation. For this reason, they cooperate with each other via bearings 18A and 18B, housed in this case in part 10C of the housing. In known manner, these bearings 18A and 18B may be bearings with tapered bearings. The system can be used to drive a wheel of a vehicle, in which case the shaft 14 can be a wheel axle.

Le distributeur 40 comprend une couronne de distribution 60 et un noyau 50, la couronne de distribution 60 et le noyau 50 sont à déplacement relatif en rotation. La couronne de distribution 60 est à déplacement relatif en rotation par rapport au bloc cylindre 12A, tandis que le noyau 50 est solidarisé à l'arbre 14, typiquement par boulonnage.The distributor 40 comprises a distribution ring 60 and a core 50, the distribution ring 60 and the core 50 are relative rotational movement. The distribution ring 60 is relatively rotational relative to the cylinder block 12A, while the core 50 is secured to the shaft 14, typically by bolting.

Les figures 2 et 3 sont des vues détaillées du distributeur 40 représenté sur la figure 1.The Figures 2 and 3 are detailed views of the dispenser 40 shown on the figure 1 .

On définit pour le distributeur 40 une extrémité proximale 40P et une extrémité distale 40D, l'extrémité proximale 40P étant définie arbitrairement comme étant l'extrémité du distributeur 40 la plus proche de l'arbre 14. De la même manière, on définit pour le noyau 50 et pour la couronne de distribution 60 une extrémité proximale 50P, 60P et une extrémité distale 60P, 60D. Dans l'exemple représenté sur les figures, l'extrémité proximale 50P du noyau 50 forme l'extrémité proximale 40P du distributeur 40, et l'extrémité distale 60D de la couronne de distribution 60 forme l'extrémité distale 40D du distributeur 40.For the dispenser 40, a proximal end 40P and a distal end 40D are defined, the proximal end 40P being arbitrarily defined as being the end of the dispenser 40 closest to the shaft 14. Likewise, for the core 50 and for the distribution ring 60 a proximal end 50P, 60P and a distal end 60P, 60D. In the example shown in the figures, the proximal end 50P of the core 50 forms the proximal end 40P of the dispenser 40, and the distal end 60D of the dispensing ring 60 forms the distal end 40D of the dispenser 40.

Le noyau 50 est inséré via son extrémité proximale 50P dans la couronne de distribution 60 depuis l'extrémité distale 60D, et coulisse dans un volume interne de la couronne de distribution 60 en direction de l'extrémité proximale 60P, par exemple jusqu'à faire saillie de son extrémité proximale 60P. Le noyau 50 présente ainsi une section externe décroissante depuis son extrémité distale 50D vers son extrémité proximale 50P, tandis que la couronne de distribution 60 définit un logement interne délimité par une section interne dont la section diminue depuis l'extrémité distale 60D vers l'extrémité proximale 60P. Ces formes permettent typiquement d'obtenir une poussée axiale, et donc l'appui de la surface 60P de la couronne de distribution 60 sur le bloc cylindre 12A, lorsque les gorges 60A et 60 B sont mises en pression hydraulique. Le distributeur 40 comprend des conduits de d'alimentation 41 et 42 aménagés dans le noyau 50, qui sont seulement amorcés sur les figures, et qui, d'une part, débouchent sur la face radiale du distributeur interne 50 tournée vers l'arbre 14, de manière à être en regard avec les extrémités des conduites 1 et 2 situées à cette extrémité de l'arbre 14 et qui, d'autre part, sont reliés à des gorges de distribution aménagées dans le noyau 50 et dans la couronne de distribution 60. Des conduits de distribution débouchent radialement sur la face formant l'extrémité proximale 60P de la couronne de distribution 60 de manière à relier les gorges externes 60A et 60B au bloc cylindre 12A de l'appareil hydraulique 12, de manière à alimenter sélectivement chaque chambre du bloc cylindres 12A de l'appareil hydraulique 12 pendant sa rotation.The core 50 is inserted via its proximal end 50P into the dispensing ring 60 from the distal end 60D, and slides in an internal volume of the dispensing ring 60 towards the proximal end 60P, for example until protruding from its proximal end 60P. The core 50 thus has a decreasing external section from its distal end 50D to its proximal end 50P, while the distribution ring 60 defines an internal housing delimited by an internal section whose section decreases from the distal end 60D towards the end. proximal 60P. These forms typically allow to obtain an axial thrust, and therefore the support of the surface 60P of the distribution ring 60 on the cylinder block 12A, when the grooves 60A and 60B are placed in hydraulic pressure. The distributor 40 comprises feed ducts 41 and 42 formed in the core 50, which are only primed in the figures, and which, on the one hand, open on the radial face of the internal distributor 50 turned towards the shaft 14 , so as to face the ends of the pipes 1 and 2 located at this end of the shaft 14 and which, on the other hand, are connected to distribution grooves arranged in the core 50 and in the distribution ring 60. Distribution ducts open radially on the face forming the end proximal 60P of the distribution ring 60 so as to connect the outer grooves 60A and 60B to the cylinder block 12A of the hydraulic apparatus 12, so as to selectively supply each chamber of the cylinder block 12A of the hydraulic apparatus 12 during its rotation.

Le noyau 50 présente ainsi des gorges internes 50A et 50B débouchant dans sa périphérie externe, et reliées aux conduits de d'alimentation 41 et 42. La couronne de distribution 60 présente des gorges externes 60A et 60B débouchant dans la périphérie interne de la couronne de distribution 60, et configurées de manière à être chacune mise en communication fluidique avec au moins une gorge interne du noyau 50.The core 50 thus has internal grooves 50A and 50B opening into its outer periphery, and connected to the feed ducts 41 and 42. The distribution ring 60 has external grooves 60A and 60B opening into the inner periphery of the outer ring. 60, and configured to be each in fluid communication with at least one inner groove of the core 50.

Les gorges externes 60A et 60B aménagées dans la couronne de distribution 60 sont reliées à des conduits débouchant sur la face radiale de la couronne de distribution 60 faisant face au bloc cylindres 12A, de manière à assurer l'alimentation et le refoulement de fluide.The outer grooves 60A and 60B arranged in the distribution ring 60 are connected to ducts opening on the radial face of the distribution ring 60 facing the cylinder block 12A, so as to ensure the supply and discharge of fluid.

La communication entre les conduites principales 1 et 2 et les conduits d'alimentation 41 et 42 est étanchée vis-à-vis du reste du système par tout moyen d'étanchéité approprié, par exemple par des joints annulaires 31 et 32 disposés entre les faces en regard du noyau 50 et de l'arbre 14, ou des segments, ou encore des compositions de joints et de segments.The communication between the main ducts 1 and 2 and the supply ducts 41 and 42 is sealed vis-à-vis the rest of the system by any appropriate sealing means, for example by annular seals 31 and 32 disposed between the faces facing the core 50 and the shaft 14, or segments, or joint compositions and segments.

De manière connue, le noyau 50 comprend une pluralité de rainures 51 dans lesquelles sont disposés des segments 52 assurant un contact étanche entre le noyau 50 et la couronne de distribution 60, et permettant ainsi d'isoler les différents conduits réalisés dans le distributeur 40 les uns par rapport aux autres, et par rapport au milieu extérieur aux gorges. Chaque gorge du distributeur 40 est donc encadrée de segments. Dans l'exemple représenté, chaque gorge interne 50A et 50B du noyau 50 est encadrée par deux paires de rainures 51 et de segments 52.In known manner, the core 50 comprises a plurality of grooves 51 in which are arranged segments 52 ensuring a sealing contact between the core 50 and the distribution ring 60, and thus isolating the various ducts made in the distributor 40. one with respect to the others, and with respect to the environment outside the throats. Each groove of the distributor 40 is therefore framed with segments. In the example shown, each internal groove 50A and 50B of the core 50 is flanked by two pairs of grooves 51 and segments 52.

Les moyens d'étanchéité 52 sont typiquement placés au montage dans les gorges 51 en les étirant pour augmenter leur diamètre. Puis ils se placent dans les gorges 51. Ensuite, le noyau 50 est placé dans la couronne 60, et les moyens d'étanchéité 52 sont en appui sur la paroi interne de la couronne 60. Cela permet d'avoir un mouvement, en particulier un glissement essentiellement axial selon l'axe A-A entre le noyau et la couronne, tout en obtenant l'étanchéité des gorges 50A et 50B.The sealing means 52 are typically placed in the mounting in the grooves 51 by stretching to increase their diameter. Then they are placed in the grooves 51. Then, the core 50 is placed in the ring 60, and the sealing means 52 are supported on the inner wall of the ring 60. This allows to have a movement, in particular essentially axial sliding along the axis AA between the core and the crown, while obtaining the tightness of the grooves 50A and 50B.

Comme indiqué dans le préambule de la présente demande de brevet, une problématique récurrente lors de l'assemblage de l'appareil hydraulique est le maintien en position des segments 52 dans les rainures 51 lorsque le distributeur 40 est manipulé individuellement, ou plus généralement lorsque le distributeur 40 n'est pas monté en appui contre d'autres composants d'appareil hydraulique. En effet, on comprend que si le noyau 50 coulisse dans la couronne de distribution 60 lors de sa manipulation pour le mettre en position, il y a un risque que des segments sortent du volume interne défini par la couronne de distribution 60, et se désengagent, en particulier au niveau de l'extrémité proximale 50P du noyau 50.As indicated in the preamble of the present patent application, a recurring problem when assembling the hydraulic apparatus is the holding in position of the segments 52 in the grooves 51 when the distributor 40 is handled individually, or more generally when the distributor 40 is not mounted in abutment against other components of hydraulic apparatus. Indeed, it is understood that if the core 50 slides in the distribution ring 60 during its handling to put it in position, there is a risk that segments out of the internal volume defined by the distribution ring 60, and disengage , especially at the proximal end 50P of the core 50.

Afin de répondre à une telle problématique, le distributeur 40 tel que proposé comprend une butée 65 formée dans ou portée par le noyau 50 ou par la couronne de distribution 60, configurée de manière à limiter le déplacement du noyau par rapport à la couronne de distribution selon une direction définie par l'axe A. On se référera par la suite de manière générale à une butée 65. On comprend que la couronne de distribution 60 peut présenter une butée unique, plusieurs butées similaires agencées autour de l'axe A, ou encore une annulaire, le fonctionnement demeurant alors inchangé.In order to respond to such a problem, the distributor 40 as proposed comprises a stop 65 formed in or carried by the core 50 or by the distribution ring 60, configured so as to limit the displacement of the core relative to the distribution ring in a direction defined by the axis A. It will be referred thereafter in general to a stop 65. It is understood that the distribution ring 60 may have a single stop, several similar stops arranged around the axis A, or another annular, the operation then remaining unchanged.

Cette butée 65 s'étend depuis la surface interne de la couronne de distribution 60, de manière à venir au contact d'une paroi d'une gorge interne 50A ou 50B du noyau 50 et ainsi limiter le déplacement du noyau 50 par rapport à la couronne de distribution 60 selon l'axe A dans un sens allant de l'extrémité distale 40D vers l'extrémité proximale 40P du distributeur 40.This abutment 65 extends from the inner surface of the distribution ring 60, so as to come into contact with a wall of an internal groove 50A or 50B of the core 50 and thus limit the displacement of the core 50 with respect to the distribution ring 60 along the axis A in a direction from the distal end 40D to the proximal end 40P of the distributor 40.

La butée 65 est typiquement une nervure ou un épaulement s'étendant depuis la surface interne de la couronne de distribution 6.The abutment 65 is typically a rib or shoulder extending from the inner surface of the distribution ring 6.

La butée est typiquement une pièce rapportée, telle qu'une goupille, insérée dans une gorge interne du noyau 50 comme on le verra par la suite en référence aux différents modes de réalisation.The abutment is typically an insert, such as a pin, inserted into an internal groove of the core 50 as will be seen later with reference to the various embodiments.

Dans l'exemple représenté sur les figures 2 et 3, la butée 65 est un épaulement formé dans la paroi interne de la couronne de distribution 60, configurée de manière à s'étendre dans la gorge interne 50B lorsque le noyau 50 est inséré dans la couronne de distribution 60.In the example shown on the Figures 2 and 3 , the abutment 65 is a shoulder formed in the inner wall of the distribution ring 60, configured to extend into the internal groove 50B when the core 50 is inserted into the distribution ring 60.

La butée 65 est configurée de manière à ne pas venir au contact du noyau 50 une fois que l'appareil hydraulique est assemblé. Plus précisément, la butée 65 est ainsi configurée pour ne pouvoir venir au contact du noyau 50 que lors de l'assemblage de l'appareil hydraulique comprenant le distributeur 40.The stop 65 is configured so as not to come into contact with the core 50 once the hydraulic apparatus is assembled. More precisely, the stop 65 is thus configured so that it can come into contact with the core 50 only during the assembly of the hydraulic apparatus comprising the distributor 40.

La figure 2 est ainsi une vue détaillée du distributeur 40 représenté sur la figure 1, tandis que la figure 3 est une vue du distributeur 40 pris isolément.The figure 2 is thus a detailed view of the distributor 40 shown on the figure 1 while the figure 3 is a view of the distributor 40 taken alone.

Comme on le voit sur la figure 2, un jeu fonctionnel J non nul demeure entre la butée 65 et la surface du noyau 50 en regard de la butée 65, ici une paroi de la gorge interne 50B. Ce jeu fonctionnel résulte des différentes surfaces de contact du noyau 50 et de la couronne de distribution 60 avec les autres éléments de l'appareil hydraulique 12, notamment avec l'arbre 14 et le bloc-cylindres 12A.As we see on the figure 2 a non-zero functional clearance J remains between the abutment 65 and the surface of the core 50 facing the abutment 65, here a wall of the internal groove 50B. This functional clearance results from the different contact surfaces of the core 50 and the distribution ring 60 with the other elements of the hydraulic apparatus 12, in particular with the shaft 14 and the cylinder block 12A.

A l'inverse, lorsque le distributeur 40 est pris isolément comme représenté sur la figure 3, le noyau 50 n'est plus limité en translation par son contact avec l'arbre 14. La butée 65 permet alors de limiter le déplacement du noyau 50 par rapport à la couronne de distribution 60 dans un sens allant de l'extrémité distale 60D vers l'extrémité proximale 60P de la couronne de distribution 60. Plus précisément, si on considère la position du distributeur 40 représentée sur la figure 2, un déplacement additionnel correspondant au jeu fonctionnel J peut se produire lorsque le distributeur 40 est pris isolément.Conversely, when the distributor 40 is taken in isolation as shown on the figure 3 , the core 50 is no longer limited in translation by its contact with the shaft 14. The stop 65 then makes it possible to limit the displacement of the core 50 with respect to the distribution ring 60 in a direction going from the distal end 60D towards the proximal end 60P of the distribution ring 60. More precisely, if we consider the position of the dispenser 40 represented on the figure 2 an additional displacement corresponding to the functional clearance J can occur when the distributor 40 is taken in isolation.

La butée 65 est configurée de manière à limiter le déplacement du noyau 50 par rapport à la couronne de distribution 60 afin d'empêcher qu'un segment 52 du noyau 50 dépasse l'extrémité proximale 60P de la couronne de distribution 60, ou plus précisément ne sorte de la couronne de distribution 60.The stop 65 is configured to limit the displacement of the core 50 relative to the distribution ring 60 in order to prevent a segment 52 of the core 50 from extending beyond the proximal end 60P of the distribution ring 60, or more precisely do sort of the distribution ring 60.

Plus précisément, on considère ici le segment 52 d'étanchéité le plus proche de l'extrémité proximale 50P du noyau 50. La couronne de distribution 60 présente une surface interne en regard de ce segment 52. On définit pour cette surface interne de la couronne de distribution 60 un dégagement proximal 63, correspondant à la première variation de section de la surface interne de la couronne de distribution en regard du segment 52, en direction de l'extrémité proximale 60P de la couronne de distribution 60.More precisely, the sealing segment 52 closest to the proximal end 50P of the core 50 is considered here. The distribution ring 60 has an internal surface facing this segment 52. For this inner surface of the crown, it is defined. 60 a proximal clearance 63, corresponding to the first section variation of the inner surface of the distribution ring facing the segment 52, towards the proximal end 60P of the distribution ring 60.

En pratique, ce dégagement proximal 63 correspond ainsi à une section de la couronne de distribution 60 n'assurant pas nécessairement un maintien du segment 52 dans son logement 51 du noyau 50.In practice, this proximal clearance 63 corresponds to a section of the distribution ring 60 that does not necessarily ensure that the segment 52 is held in its housing 51 of the core 50.

La butée 65 est configurée de sorte que la distance mesurée selon l'axe A entre le dégagement proximal 63 et le segment le plus proche (selon l'axe A) de l'extrémité proximale 50P du noyau 50 demeure non nulle, et donc de sorte que le segment 52 ne puisse pas aller au-delà du dégagement proximal 63. Ainsi, le segment 52 le plus proche de l'extrémité proximale 50P du noyau 50 demeure maintenu en place par la surface interne de la couronne de distribution 60.The stop 65 is configured so that the distance measured along the axis A between the proximal clearance 63 and the closest segment (along the axis A) of the proximal end 50P of the core 50 remains non-zero, and therefore of so that the segment 52 can not go beyond the proximal clearance 63. Thus, the segment 52 closest to the proximal end 50P of the core 50 remains held in place by the inner surface of the distribution ring 60.

Dans certains modes de réalisation, le dégagement proximal 63 correspond à l'extrémité proximale 60P de la couronne de distribution 60. La butée 65 est alors configurée de manière à ce que la longueur (mesurée selon l'axe A) de la portion du noyau 50 pouvant venir en saillie de l'extrémité proximale 60P de la couronne de distribution 60 soit strictement inférieure à la distance (mesurée selon l'axe A) entre l'extrémité proximale 50P du noyau 50 et le segment 51 le plus proche de ladite extrémité proximale 50P du noyau 50.In some embodiments, the proximal clearance 63 corresponds to the proximal end 60P of the distribution ring 60. The stop 65 is then configured so that the length (measured along the axis A) of the portion of the core 50 that can project from the proximal end 60P of the distribution ring 60 is strictly less than the distance (measured along the axis A) between the proximal end 50P of the core 50 and the segment 51 closest to said end 50P proximal of the nucleus 50.

En effet, lors du montage du distributeur 40 contre l'arbre 14 et contre le bloc cylindres 12A, l'utilisateur va maintenir le distributeur 40 par son extrémité distale 40P afin de venir le disposer en appui contre l'arbre 14 et contre le bloc cylindres 12A. L'utilisateur prévient ainsi un désengagement via l'extrémité distale 40D, tandis que la butée 65 prévient un désengagement via l'extrémité proximale 40P. L'utilisateur peut ensuite solidariser le noyau 50 à l'arbre 14, par exemple par boulonnage, ce qui fixe le distributeur 40 et prévient alors tout risque ultérieur de chute avant de positionner les éléments restant du système.Indeed, during the assembly of the distributor 40 against the shaft 14 and against the cylinder block 12A, the user will maintain the distributor 40 by its distal end 40P in order to come dispose of it against the shaft 14 and against the block cylinders 12A. The user thus prevents disengagement via the distal end 40D, while the stop 65 prevents disengagement via the proximal end 40P. The user can then secure the core 50 to the shaft 14, for example by bolting, which fixes the distributor 40 and then prevents any risk of subsequent fall before positioning the remaining elements of the system.

De cette manière, les segments 52 sont maintenus enserrés entre le noyau 50 et la couronne de distribution 60, ce qui prévient tout risque de perte ou de chute accidentelle d'un segment.In this way, the segments 52 are held together between the core 50 and the distribution ring 60, which prevents any risk of accidental loss or fall of a segment.

La figure 4 présente une variante du mode de réalisation représenté sur la figure 3.The figure 4 presents a variant of the embodiment shown in the figure 3 .

La butée 65 est ici un épaulement s'étendant depuis une paroi radiale d'une gorge externe 60A. Comme pour le mode de réalisation décrit en référence à la figure 3, la butée 65 vient au contact d'une paroi radiale d'une gorge interne, ici la gorge interne 50A afin de limiter le déplacement du noyau 50 par rapport à la couronne de distribution 60 dans un sens allant de l'extrémité distale 60D vers l'extrémité proximale 60P de la couronne de distribution 60.The abutment 65 is here a shoulder extending from a radial wall of an external groove 60A. As for the embodiment described with reference to the figure 3 the abutment 65 comes into contact with a radial wall of an internal groove, here the internal groove 50A in order to limit the displacement of the core 50 relative to the distribution ring 60 in a direction from the distal end 60D towards the proximal end 60P of the distribution ring 60.

Les figures 5 à 9 sont des variantes de modes de réalisation du distributeur.The Figures 5 to 9 are variants of embodiments of the dispenser.

La figure 5 représente une variante dans laquelle la butée 65 est formée par un épaulement s'étendant depuis la périphérie externe du noyau 50 du distributeur 40. Cet épaulement formant butée 65 vient alors en butée contre une surface radiale de la couronne de distribution 60, afin de limiter le déplacement du noyau 50 par rapport à la couronne de distribution 60 dans un sens allant de l'extrémité distale 60D vers l'extrémité proximale 60P de la couronne de distribution 60. L'épaulement tel que représenté est formé adjacent à la gorge interne 50B, on comprend qu'il peut également être formé adjacent à la gorge interne 50A, la fonction étant alors réalisée à l'identique.The figure 5 represents a variant in which the stop 65 is formed by a shoulder extending from the outer periphery of the core 50 of the distributor 40. This shoulder forming a stop 65 then abuts against a radial surface of the distribution ring 60, in order to limit the displacement of the core 50 relative to the distribution ring 60 in a direction from the distal end 60D to the proximal end 60P of the distribution ring 60. The shoulder as shown is formed adjacent to the internal groove 50B it is understood that it can also be formed adjacent to the internal groove 50A, the function then being performed identically.

La figure 6 représente une autre variante dans laquelle la butée 65 est formée au niveau de l'extrémité proximale 60P de la couronne de distribution 60. Cette butée 65 limite ainsi le mouvement du noyau 50 dont une paroi radiale vient au contact de la butée 65. Le fonctionnement demeure inchangé. On note que la butée 65 forme le dégagement proximal 63, mais assure de par son emplacement que les segments ne puissent pas sortir de la couronne de distribution 60 par l'extrémité proximale.The figure 6 represents another variant in which the stop 65 is formed at the proximal end 60P of the distribution ring 60. This stop 65 thus limits the movement of the core 50, a radial wall of which comes into contact with the stop 65. The operation remains unchanged. Note that the stop 65 forms the proximal clearance 63, but ensures by its location that the segments can not leave the dispensing ring 60 by the proximal end.

La figure 7 représente une autre variante dans laquelle la butée 65 est formée par une vis introduite dans un perçage 66 formé dans la couronne de distribution 60. Le perçage 66 est réalisé de manière à ce que la vis formant la butée puisse être insérée dans une gorge interne, ici la gorge interne 50B. L'extrémité de la vis pénétrant dans la gorge interne vient ici définir un débattement axial limité du noyau 50 par rapport à la couronne de distribution 60 selon les deux sens de l'axe A. Dans un tel mode de réalisation, une fois le distributeur 40 positionné, la vis peut être maintenue en position ou être retirée par l'opérateur, et le perçage 66 est alors obturé. Cette variante est notamment avantageuse en ce que le distributeur 40 ne peut se désassembler, en particulier dans le cas d'une utilisation en tant que pièce détachée qui a été assemblée avant son transport, ce qui facilite alors le montage sur l'appareil hydraulique. Des éléments d'étanchéité tels que des joints (non représentés) sont typiquement prévus entre la vis et le perçage 66. Un jeu fonctionnel est typiquement prévu radialement entre l'extrémité libre de la vis formant la butée 65 et la paroi axiale de la gorge associée.The figure 7 represents another variant in which the stop 65 is formed by a screw inserted into a bore 66 formed in the distribution ring 60. The bore 66 is formed so that the screw forming the abutment can be inserted into an internal groove, here the internal groove 50B. The end of the screw penetrating into the internal groove here defines a limited axial displacement of the core 50 relative to the distribution ring 60 in both directions of the axis A. In such an embodiment, once the distributor 40 positioned, the screw can be held in position or removed by the operator, and the hole 66 is then closed. This variant is particularly advantageous in that the distributor 40 can not disassemble, particularly in the case of a used as a spare part that has been assembled before it is transported, which facilitates assembly on the hydraulic unit. Sealing elements such as seals (not shown) are typically provided between the screw and the bore 66. A functional clearance is typically provided radially between the free end of the screw forming the abutment 65 and the axial wall of the throat associated.

La figure 8 représente une autre variante dans laquelle un épaulement s'étend depuis l'extrémité distale 50D du noyau 50. Cet épaulement forme la butée 65, et est configuré pour venir en appui contre une surface radiale de la couronne de distribution 60 formant son extrémité distale 60D, ou proche de l'extrémité distale 60D.The figure 8 represents another variant in which a shoulder extends from the distal end 50D of the core 50. This shoulder forms the abutment 65, and is configured to bear against a radial surface of the distribution ring 60 forming its distal end 60D , or near the distal end 60D.

La figure 9 représente une autre variante dans laquelle la butée 65 est formée par un insert positionné dans un logement 67 formé dans une gorge interne, ici la gorge interne 50B. L'insert est par exemple un circlip, un anneau, segment d'anneau ou demi-anneau, une goupille ou tout autre élément adapté. Dans le mode de réalisation représenté sur la figure 9, la butée 65 est formée par une goupille. Comme pour les modes de réalisation décrits précédemment, cet insert forme une butée 65 permettant de limiter le déplacement du noyau 50 par rapport à la couronne de distribution 60 dans un sens allant de l'extrémité distale 60D vers l'extrémité proximale 60P de la couronne de distribution 60. Un jeu fonctionnel est prévu radialement entre l'extrémité libre de l'insert formant la butée et la paroi axiale de la gorge associée.The figure 9 represents another variant in which the stop 65 is formed by an insert positioned in a housing 67 formed in an internal groove, here the internal groove 50B. The insert is for example a circlip, a ring, ring or half-ring segment, a pin or any other suitable element. In the embodiment shown on the figure 9 the stop 65 is formed by a pin. As for the embodiments described above, this insert forms a stop 65 making it possible to limit the displacement of the core 50 relative to the distribution ring 60 in a direction going from the distal end 60D towards the proximal end 60P of the crown. 60. A functional clearance is provided radially between the free end of the insert forming the abutment and the axial wall of the associated groove.

On comprend à la lecture de ce qui précède que la butée 65 est formée sur l'un parmi le noyau 50 et la couronne de distribution 60, et est adaptée pour venir au contact d'une surface de l'autre parmi le noyau 50 et la couronne de distribution 60. La butée 65 est uniquement exploitée lors de l'assemblage d'un appareil hydraulique. Plus généralement, la butée 65 peut être qualifiée d'interne au distributeur 40, en ce qu'elle ne nécessite pas d'éléments externes au distributeur 40 pour réaliser sa fonction. Une fois l'appareil hydraulique assemblé, la butée 65 n'est plus au contact du noyau 50 afin d'éviter de générer des frottements additionnels entre le noyau 50 et la couronne de distribution 60.It is understood from the above that the stop 65 is formed on one of the core 50 and the distribution ring 60, and is adapted to come into contact with a surface of the other of the core 50 and 60. The stop 65 is only used when assembling a hydraulic device. More generally, the stop 65 may be described as internal to the distributor 40, in that it does not require external elements to the distributor 40 to perform its function. Once the hydraulic device has been assembled, the stop 65 is no longer in contact with the core 50 in order to avoid generating additional friction between the core 50 and the distribution ring 60.

On comprend ainsi que les différents modes de réalisation représentés sur les figures 1 à 6 permettent de limiter le déplacement relatif du noyau 50 par rapport à la couronne de distribution 60 dans un sens donné, à savoir un déplacement du noyau 50 dans le sens allant de l'extrémité distale 60D de la couronne de distribution 60 vers l'extrémité proximale 60P de la couronne de distribution 60.It is thus understood that the various embodiments represented on the Figures 1 to 6 allow to limit the relative displacement of the core 50 with respect to the distribution ring 60 in a given direction, namely a displacement of the core 50 in the direction from the distal end 60D of the distribution ring 60 to the proximal end 60P of the distribution ring 60.

En variante de ces différents modes de réalisation déjà décrits, le distributeur 40 tel que proposé peut également comprendre une butée secondaire telle qu'un anneau élastique ou un couvercle afin de limiter le déplacement relatif du noyau 50 par rapport à la couronne de distribution 60 dans l'autre sens, à savoir un déplacement du noyau 50 dans le sens allant de l'extrémité proximale 60P de la couronne de distribution 60 vers l'extrémité distale 60D de la couronne de distribution 60. La butée secondaire est typiquement amovible.As a variant of these various embodiments already described, the dispenser 40 as proposed may also comprise a secondary abutment such as an elastic ring or a cover in order to limit the relative displacement of the core 50 relative to the distribution ring 60 in the other direction, namely a displacement of the core 50 in the direction from the proximal end 60P of the distribution ring 60 to the distal end 60D of the distribution ring 60. The secondary stop is typically removable.

Les figures 10 et 11 présentent ainsi deux variantes comprenant une telle butée secondaire sous la forme d'un anneau élastique 7.The Figures 10 and 11 thus present two variants comprising such a secondary abutment in the form of an elastic ring 7.

La figure 10 est une variante de la figure 4, dans laquelle un anneau élastique 7 est inséré dans une gorge 67 aménagée à proximité de l'extrémité distale 60D de la couronne de distribution 60. De tels anneaux élastiques sont communément désignés par l'appellation « circlip ».The figure 10 is a variant of the figure 4 , in which an elastic ring 7 is inserted into a groove 67 arranged near the distal end 60D of the distribution ring 60. Such elastic rings are commonly referred to by the name "circlip".

L'anneau élastique 7 définit ici une butée limitant le déplacement relatif du noyau 50 par rapport à la couronne de distribution 60 dans le sens allant de l'extrémité proximale 60P de la couronne de distribution 60 vers l'extrémité distale 60D de la couronne de distribution 60 ; l'extrémité distale 50D du noyau 50b vient alors en butée contre l'anneau élastique 7.The elastic ring 7 here defines an abutment limiting the relative displacement of the core 50 with respect to the distribution ring 60 in the direction from the proximal end 60P of the distribution ring 60 to the distal end 60D of the crown. distribution 60; the distal end 50D of the core 50b then abuts against the elastic ring 7.

La figure 11 est une autre variante de la figure 4, dans laquelle l'anneau élastique 7 est ici positionné dans une gorge 57 aménagée dans le noyau 50, à proximité de son extrémité proximale 50P. Comme précédemment, l'anneau élastique 7 définit une butée limitant le déplacement relatif du noyau 50 par rapport à la couronne de distribution 60 dans le sens allant de l'extrémité proximale 60P de la couronne de distribution 60 vers l'extrémité distale 60D de la couronne de distribution 60 ; l'anneau élastique 7 vient alors en butée contre le dégagement proximal 63 de la couronne de distribution 60.The figure 11 is another variant of the figure 4 , in which the elastic ring 7 is here positioned in a groove 57 provided in the core 50, near its proximal end 50P. As before, the elastic ring 7 defines a stop limiting the relative displacement of the core 50 relative to the distribution ring 60 in the direction from the proximal end 60P of the distribution ring 60 to the distal end 60D of the distribution ring 60; the elastic ring 7 then abuts against the proximal clearance 63 of the distribution ring 60.

Les figures 10 et 11 décrites précédemment présentent ainsi différents modes de réalisation pour l'ajout d'une butée secondaire 7. On comprend que ces modes de réalisation ont été présentés comme variantes de la figure 4, mais que les différents montages d'un anneau élastique 7 formant une telle butée secondaire peuvent également être appliqués pour les autres modes de réalisation déjà décrits en référence aux autres figures, l'emplacement de la butée secondaire 7 étant déterminé notamment en fonction de celui de la butée 65.The Figures 10 and 11 previously described thus present different embodiments for the addition of a secondary stop 7. It is understood that these embodiments have been presented as variants of the figure 4 , but that the various assemblies of an elastic ring 7 forming such a secondary abutment can also be applied for the other embodiments already described with reference to the other figures, the location of the secondary abutment 7 being determined in particular according to that stop 65.

La figure 12 présente un autre mode de réalisation de la butée secondaire 7, qui présente ici la forme d'une coiffe. La couronne de distribution 60 présente une gorge externe 68 s'étendant typiquement sur toute sa périphérie externe, dans laquelle sont engagées des pattes de fixation 71 de la coiffe 7. La coiffe 7 recouvre ici au moins partiellement l'extrémité distale 60D de la couronne de distribution 60, de manière à définir une butée limitant le déplacement relatif du noyau 50 par rapport à la couronne de distribution 60 dans le sens allant de l'extrémité proximale 60P de la couronne de distribution 60 vers l'extrémité distale 60D de la couronne de distribution 60, l'extrémité distale 50D du noyau 50 venant alors au contact de la coiffe 7. La coiffe 7 présente typiquement une ou plusieurs ouvertures afin de permettre le passage de boulons notamment pour l'assemblage du noyau 50 et de la couronne de distribution 60 sur les autres composants d'un appareil hydraulique tout en conservant la coiffe 7 en place, cette dernière étant alors retirée suite à cet assemblage. La figure 13 est un exemple de mode de réalisation d'une telle coiffe 7.The figure 12 presents another embodiment of the secondary abutment 7, which here has the shape of a cap. The distribution ring 60 has an external groove 68 extending typically over its entire outer periphery, in which are engaged fixing lugs 71 of the cap 7. The cap 7 here covers at least partially the distal end 60D of the crown distribution 60, so as to define a stop limiting the relative displacement of the core 50 relative to the distribution ring 60 in the direction from the proximal end 60P of the distribution ring 60 to the distal end 60D of the crown 60, the distal end 50D of the core 50 then coming into contact with the cap 7. The cap 7 typically has one or more openings to allow the passage of bolts including the assembly of the core 50 and the crown of distribution 60 on the other components of a hydraulic device while keeping the cap 7 in place, the latter then being removed as a result of this assembly. The figure 13 is an exemplary embodiment of such a cap 7.

Tout comme les modes de réalisation comprenant un anneau élastique 7 formant la butée secondaire, on comprend que le mode de réalisation dans lequel la butée secondaire 7 est formée par une coiffe a été décrit en référence à la figure 4, mais que ce mode de réalisation peut être employé pour les différents modes de réalisation de la butée 65.Just as the embodiments comprising an elastic ring 7 forming the secondary abutment, it is understood that the embodiment in which the secondary abutment 7 is formed by a cap has been described with reference to the figure 4 , but that this embodiment can be used for the various embodiments of the abutment 65.

Afin d'assembler un appareil hydraulique tel que présenté sur la figure 1, un opérateur va dans un premier temps positionner les paliers 18A et 18B ainsi que le segment de carter 10C autour de l'arbre 14, puis le segment de carter 10B. Si l'opérateur réalise l'assemblage directement sur un véhicule, les éléments précédents sont déjà assemblés et constituent une fusée de roue sur un moyeu. L'opérateur va ensuite placer le bloc cylindres 12A et la came 12B. Il va ensuite amener le distributeur 40 afin de le positionner en appui contre l'arbre 14 et contre le bloc cylindres 14A comme indiqué précédemment (en ayant le cas échéant retiré la butée secondaire 7), la butée 65 assurant alors une fonction de maintien en position des segments 52 en les maintenant enserrés entre le noyau 50 et la couronne de distribution 60. L'opérateur positionne ensuite couvercle 10A qui va maintenir le distributeur 40 en position.In order to assemble a hydraulic device as presented on the figure 1 , an operator will initially position the bearings 18A and 18B and the housing segment 10C around the shaft 14, then the housing segment 10B. If the operator performs the assembly directly on a vehicle, the previous elements are already assembled and constitute a wheel spindle on a hub. The operator will then place the cylinder block 12A and the cam 12B. It will then bring the distributor 40 to position it in abutment against the shaft 14 and against the cylinder block 14A as indicated above (possibly having removed the secondary stop 7), the stop 65 thus providing a function of maintaining the segments 52 in position by keeping them sandwiched between the core 50 and the distribution ring 60. The operator then positions cover 10A which will maintain the distributor 40 in position.

Le distributeur 40 tel que proposé permet ainsi de faciliter les opérations d'assemblage d'un appareil hydraulique comprenant un tel distributeur, et évite ainsi les risques de pertes de temps ou d'endommagement du distributeur 40 résultant d'une perte de segment 52 liée à un déplacement excessif du noyau 50 par rapport à la couronne de distribution 60 alors que le distributeur 40 n'a pas encore été assemblé à d'autres composants d'appareil hydraulique. Ces avantages s'appliquent également plus généralement pour toute opération de transport, ou impliquant une manipulation du distributeur 40 avant son montage.The dispenser 40 as proposed thus facilitates the assembly operations of a hydraulic apparatus comprising such a dispenser, and thus avoids the risk of loss of time or damage to the distributor 40 resulting from a segment loss 52 linked excessive displacement of the core 50 relative to the distribution ring 60 while the distributor 40 has not yet been assembled to other components of hydraulic apparatus. These advantages also apply more generally for any transport operation, or involving manipulation of the distributor 40 before assembly.

Bien que la présente invention ait été décrite en se référant à des exemples de réalisation spécifiques, il est évident que des modifications et des changements peuvent être effectués sur ces exemples sans sortir de la portée générale de l'invention telle que définie par les revendications. En particulier, des caractéristiques individuelles des différents modes de réalisation illustrés/mentionnés peuvent être combinées dans des modes de réalisation additionnels. Par conséquent, la description et les dessins doivent être considérés dans un sens illustratif plutôt que restrictif.Although the present invention has been described with reference to specific exemplary embodiments, it is obvious that modifications and changes can be made to these examples without departing from the general scope of the invention as defined by the claims. In particular, individual features of the various embodiments illustrated / mentioned can be combined in additional embodiments. Therefore, the description and drawings should be considered in an illustrative rather than restrictive sense.

Il est également évident que toutes les caractéristiques décrites en référence à un procédé sont transposables, seules ou en combinaison, à un dispositif, et inversement, toutes les caractéristiques décrites en référence à un dispositif sont transposables, seules ou en combinaison, à un procédé.It is also obvious that all the features described with reference to a method can be transposed, alone or in combination, to a device, and conversely, all the features described with reference to a device can be transposed, alone or in combination, to a method.

Claims (10)

Distributeur (40) pour appareil hydraulique, comprenant un noyau (50) et une couronne de distribution (60) monté tournant autour du noyau (50) selon un axe (A) définissant une extrémité proximale (40P) et une extrémité distale (40D), la couronne de distribution (60) et le noyau (50) étant monté coulissants l'un par rapport à l'autre selon l'axe (A),
le noyau (50) présentant une pluralité de gorges internes (50A, 50B) débouchant dans une périphérie externe du noyau (50),
la couronne de distribution (60) présentant une pluralité de gorges externes (60A, 60B) débouchant dans une périphérie interne de la couronne de distribution (60),
lesdites gorges internes (50A, 50B) et externes (60A, 60B) étant configurées pour être mises en communication fluidique et former des conduits de circulation de fluide,
le noyau (50) comprenant une pluralité de segments d'étanchéité (52) configurés de manière à isoler chacun desdits conduits de circulation de fluide,
le noyau (50) présentant une section externe décroissante depuis une extrémité distale (50D) vers une extrémité proximale (50P),
le distributeur (40) étant caractérisé en ce que l'un parmi le noyau (50) et la couronne de distribution (60) comprend une butée (65) configurée de manière à venir au contact d'une paroi de l'autre parmi le noyau (50) et la couronne de distribution (60) afin de limiter le déplacement du noyau (50) par rapport à la couronne de distribution (60) selon une direction définie par l'axe (A).A dispenser (40) for a hydraulic apparatus comprising a core (50) and a dispensing ring (60) rotatably mounted about the core (50) along an axis (A) defining a proximal end (40P) and a distal end (40D) , the distribution ring (60) and the core (50) being slidably mounted relative to one another along the axis (A),
the core (50) having a plurality of internal grooves (50A, 50B) opening into an outer periphery of the core (50),
the distribution ring (60) having a plurality of external grooves (60A, 60B) opening into an inner periphery of the distribution ring (60),
said internal (50A, 50B) and external grooves (60A, 60B) being configured to be in fluid communication and to form fluid flow conduits,
the core (50) comprising a plurality of sealing segments (52) configured to isolate each of said fluid flow conduits,
the core (50) having an outer section decreasing from a distal end (50D) to a proximal end (50P),
the dispenser (40) being characterized in that one of the core (50) and the dispensing ring (60) comprises a stop (65) configured to engage a wall of the other one of the core (50) and the distribution ring (60) to limit the displacement of the core (50) relative to the distribution ring (60) in a direction defined by the axis (A). Distributeur (40) selon la revendication 1, dans lequel ladite butée (65) est configurée de manière à limiter le déplacement selon l'axe (A) du noyau (50) par rapport à la couronne de distribution (60), de l'extrémité distale (60D) vers l'extrémité proximale (60P).The dispenser (40) according to claim 1, wherein said stopper (65) is configured to limit the displacement along the axis (A) of the core (50) with respect to the dispensing ring (60), the distal end (60D) towards the proximal end (60P). Distributeur selon la revendication 2, dans lequel
chacun desdits segments d'étanchéité (52) du noyau (50) est positionné dans un logement (51) aménagé dans le noyau (50), et est en appui contre une face interne de la couronne de distribution (60),
et dans lequel la butée (65) est configurée de manière à limiter le déplacement du noyau (50) par rapport à la couronne de distribution (60) selon une direction définie par l'axe (A) de sorte que la distance entre le segment d'étanchéité (52) proximal et le dégagement proximal (63) de la couronne de distribution (60) demeure non nulle,
le segment d'étanchéité (52) proximal étant le segment d'étanchéité (52) le plus proche selon l'axe (A) de l'extrémité proximale (50P) du noyau (50), et
le dégagement proximal (63) de la couronne de distribution (60) étant défini comme la première variation de section de la surface interne de la couronne de distribution (60) en appui contre le segment d'étanchéité (52) proximal, en direction d'une extrémité proximale (60P) de la couronne de distribution (60).Dispenser according to claim 2, wherein
each of said sealing segments (52) of the core (50) is positioned in a housing (51) arranged in the core (50), and bears against an inner face of the distribution ring (60),
and wherein the stopper (65) is configured to limit the displacement of the core (50) relative to the distribution ring (60) in a direction defined by the axis (A) so that the distance between the segment proximal sealing (52) and the proximal clearance (63) of the dispensing ring (60) remains non-zero,
the proximal sealing segment (52) being the closest sealing segment (52) along the axis (A) of the proximal end (50P) of the core (50), and
the proximal clearance (63) of the distribution ring (60) being defined as the first section variation of the inner surface of the distribution ring (60) bearing against the proximal sealing segment (52), in the direction of a proximal end (60P) of the dispensing crown (60). Distributeur selon l'une des revendications 2 ou 3, dans lequel ladite butée (65) est solidaire de la couronne de distribution (60), et est configurée de manière à venir au contact d'une paroi du noyau (50).Dispenser according to one of claims 2 or 3, wherein said stop (65) is integral with the distribution ring (60), and is configured to come into contact with a wall of the core (50). Distributeur selon l'une des revendications 2 ou 3, dans lequel ladite butée (65) est solidaire du noyau (50), et est configurée de manière à venir au contact d'une paroi de la couronne de distribution (60).Dispenser according to one of claims 2 or 3, wherein said stop (65) is integral with the core (50), and is configured to come into contact with a wall of the distribution ring (60). Distributeur selon l'une des revendications 1 à 5, comprenant en outre une butée secondaire (7) assemblée sur le noyau (50) ou sur la couronne de distribution (60), de sorte que le déplacement du noyau (50) par rapport à la couronne de distribution (60) selon une direction définie par l'axe (A) soit limité dans un sens par la butée (65), et dans l'autre sens par la butée secondaire (7).Dispenser according to one of claims 1 to 5, further comprising a secondary stop (7) assembled on the core (50) or on the distribution ring (60), so that the displacement of the core (50) relative to the distribution ring (60) in a direction defined by the axis (A) is limited in one direction by the stop (65), and in the other direction by the secondary stop (7). Distributeur selon la revendication 6, dans lequel la butée secondaire (7) est un anneau élastique monté dans une gorge (57, 67) aménagée dans le noyau (50) ou dans la couronne de distribution (60).Dispenser according to claim 6, wherein the secondary stop (7) is a resilient ring mounted in a groove (57, 67) formed in the core (50) or in the distribution ring (60). Distributeur selon la revendication 6, dans lequel la butée secondaire (7) est un élément formant un couvercle, monté autour de l'extrémité distale (60D) de la couronne de distribution (60), ledit élément formant couvercle présentant une surface formant une butée lors du déplacement du noyau (50) par rapport à la couronne de distribution (60) selon l'axe (A) dans un sens allant de l'extrémité proximale (60P) vers l'extrémité distale (60D) de la couronne de distribution (60).A dispenser according to claim 6, wherein the secondary stop (7) is a lid member mounted around the distal end (60D) of the dispensing ring (60), said member forming cover having a surface forming a stop during displacement of the core (50) relative to the dispensing ring (60) along the axis (A) in a direction from the proximal end (60P) to the distal end ( 60D) of the distribution ring (60). Appareil hydraulique à pistons radiaux et came multilobes, comprenant un distributeur (40) selon l'une des revendications précédentes, dans laquelle il existe un jeu (J) non nul selon l'axe (A) entre la butée (65) du distributeur (40) et une surface du noyau (50) disposée en regard de la butée (65).Hydraulic piston and multilobe cam apparatus, comprising a distributor (40) according to one of the preceding claims, wherein there is a non-zero clearance (J) along the axis (A) between the stop (65) of the distributor ( 40) and a surface of the core (50) disposed opposite the stop (65). Procédé d'assemblage d'un appareil hydraulique sur une fusée de roue, dans lequel
on positionne un premier ensemble de composants de l'appareil hydraulique autour d'un axe (14) de la fusée de roue,
on fournit un distributeur (40) selon l'une des revendications 1 à 8,
on positionne le distributeur (40) en appui contre des composants du premier ensemble de composants, de manière à définir un jeu (J) non nul selon un axe (A) de la fusée de roue entre la butée (65) du distributeur et une surface du noyau (50) disposée en regard de la butée (65),
on solidarise le noyau (50) à un composant du premier ensemble de composants,
on positionne un second ensemble de composants de l'appareil hydraulique, de manière à définir un volume interne de carter dans lequel est positionné le distributeur (40).A method of assembling a hydraulic apparatus on a wheel spindle, wherein
positioning a first set of components of the hydraulic apparatus around an axis (14) of the wheel spindle,
there is provided a dispenser (40) according to one of claims 1 to 8,
the distributor (40) is positioned in abutment with components of the first set of components, so as to define a non-zero clearance (J) along an axis (A) of the wheel spindle between the limit stop (65) of the distributor and a core surface (50) disposed opposite the stop (65),
the core (50) is joined to a component of the first set of components,
positioning a second set of components of the hydraulic apparatus, so as to define an internal housing volume in which is positioned the distributor (40).
EP18173896.4A 2017-05-24 2018-05-23 Hydraulic device comprising an improved distributor Active EP3406901B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1754608A FR3066789B1 (en) 2017-05-24 2017-05-24 HYDRAULIC UNIT INCLUDING AN IMPROVED DISTRIBUTOR

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EP3406901A1 true EP3406901A1 (en) 2018-11-28
EP3406901B1 EP3406901B1 (en) 2020-01-01

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ID=59253804

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EP18173896.4A Active EP3406901B1 (en) 2017-05-24 2018-05-23 Hydraulic device comprising an improved distributor

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EP (1) EP3406901B1 (en)
FR (1) FR3066789B1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2655090A1 (en) * 1989-11-30 1991-05-31 Poclain Hydraulics Sa PRESSURIZED FLUID MECHANISM, SUCH AS AN ENGINE OR A PUMP, REACHED TO A BRAKING DEVICE.
EP0921309A1 (en) * 1997-12-02 1999-06-09 Poclain Hydraulics Hydraulic motor with switch valve
US6494126B1 (en) * 1997-11-11 2002-12-17 Valmet Hydraulics Oy Radial piston hydraulic motor
FR3030381A1 (en) * 2014-12-19 2016-06-24 Laurent Eugene Albert HYDRAULIC MOTOR FOR VEHICLE WHEEL
WO2016198793A1 (en) * 2015-06-12 2016-12-15 Poclain Hydraulics Industrie Drained-chamber hydraulic system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2655090A1 (en) * 1989-11-30 1991-05-31 Poclain Hydraulics Sa PRESSURIZED FLUID MECHANISM, SUCH AS AN ENGINE OR A PUMP, REACHED TO A BRAKING DEVICE.
US6494126B1 (en) * 1997-11-11 2002-12-17 Valmet Hydraulics Oy Radial piston hydraulic motor
EP0921309A1 (en) * 1997-12-02 1999-06-09 Poclain Hydraulics Hydraulic motor with switch valve
FR3030381A1 (en) * 2014-12-19 2016-06-24 Laurent Eugene Albert HYDRAULIC MOTOR FOR VEHICLE WHEEL
WO2016198793A1 (en) * 2015-06-12 2016-12-15 Poclain Hydraulics Industrie Drained-chamber hydraulic system

Also Published As

Publication number Publication date
EP3406901B1 (en) 2020-01-01
FR3066789B1 (en) 2020-12-04
FR3066789A1 (en) 2018-11-30

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