FR2501812A1 - COUPLING OF HIGH ELASTICITY TREES - Google Patents

Abstract

THE INVENTION CONCERNS A COUPLING OF HIGH ELASTICITY SHAFTS, OR THE ELASTIC INTERMEDIATE BODY CONNECTING THE TWO COUPLING PARTS IS CONSTITUTED BY A COMBINATION OF CONCENTRIC ELASTIC ANNULAR ELEMENTS INCLUDING AT LEAST TWO ANNULAR AND PARALLEL ELEMENTS 3, 4 AN ANNULAR ELEMENT 5 MOUNTED AT THE REAR OF THESE LATEST. METAL ELEMENTS SERVING FOR THE CONNECTION WITH THE RIGID COUPLING PARTS ARE FIXED TO THE ANNULAR ELEMENTS 3, 4, 5. TWO ANNULAR ELEMENTS 3, 4 ARE ARRANGED AGAINST THE OTHER IN AXIAL DIRECTION AROUND THE HUB 1 OF A FIRST COUPLING PART BY BEING FIXED BY THEIR EXTERNAL FRONTAL SIDES ON THE HUB 1 AND BY THEIR INTERNAL FRONT SIDES ON AN ANNULAR DISC 15 RADIAL BEARING ON THE HUB. AN EXTERNAL ANNULAR ELEMENT 5 IS FIXED ON A FRONT SIDE TO A PROJECTING EDGE OF THE ANNULAR DISC 15 AND ON ITS OTHER FRONT SIDE TO THE SECOND COUPLING PART 2.

Description

25018-12

  Coupling of trees with high elasticity.

  The present invention relates to a coupling of shafts to

  high elasticity, in which the elastic intermediate member

  that which connects the two coupling parts is constituted by a combination of concentric annular elements made of an elastic material such as rubber or the like comprising at least two annular elements mounted in parallel and

  at least one annular element mounted at the rear of these

  niers, metallic elements which are used for the connection with the rigid coupling parts being fixed to the elements

  annular, preferably by vulcanization.

  Shaft couplings of the type described above, that is to say comprising a combination of several concentric rubber rings which transmit the torque by their arrangement in parallel and one behind

  the others are known. We vulcanize metallic elements

  on the closed rubber rings to connect and fix them. A known shaft coupling comprises two internal rubber rings mounted in parallel and two external rubber rings mounted in parallel, the

  pairs thus formed being mounted one behind the other

  be. The internal rubber rings transmit the torque through a rotational thrust, while the external rubber rings are arranged so that

be subjected to torsional stress.

  The use of a combination of several concentric rubber rings makes it possible to obtain a coupling of shafts having generally good elastic properties. However, the drawback is that the external rubber rings and the fastening elements associated with them are in free connection with the internal rubber rings and bear in axial direction and not immobile on one of the two parts d 'coupling. In an arrangement of this type, eccentric offsets of the masses which are not supported may appear due to the manufacturing tolerances and / or static elastic compressions of the rubber bodies determined by the load applied by

  the weight. The resulting imbalance can reach values

  their inadmissibly high when the coupling is in operation. In any case, the shafts and bearings are subjected to additional loads due to the imbalance. In addition, unbalance results in improper functioning.

installation guide.

  Added to this is that for shaft couplings with several concentric rubber rings, relatively large spaces are provided for exchanging a defective rubber ring at the place of use,

  so that removal in vertical direction is possible

  wedge and the vertical positioning of the closed rubber rings in the space between the two rigid coupling parts. Like on the other hand, when it

  these are shaft couplings, the axial length of the

  seems to be as small as possible, it is a disadvantage

  tageux to have to provide specific free spaces

  only for the exchange of rubber rings. The exchange

  The age of closed rubber rings is made even more difficult since the necessary fixing means such as screws or the like are generally difficult to access.

  the inside of the rubber rings.

  The object of the invention is to eliminate these difficulties. She

  therefore aims to propose a coupling of compre-

  nant a combination of elastic annular elements concen-

  triques designed in such a way that radial support is provided even for the external annular elements, without this affecting the flexibility of the coupling in all directions, and in addition so that the annular elements can be easily exchanged without

  have to plan for the exchange of specific free spaces

  -liers. In addition, and apart from the elastic properties in rotation, the coupling of shafts must have a significant capacity to shift when there is misalignment

  radial, axial and angular of the shafts connected to each other.

  The invention begins with the coupling of ar-

  high elasticity berries of the type described in the preamble.

  To prevent masses from being supported in

  radial direction, there is provided according to the invention an agency-

  ment according to which two annular elements are arranged one against the other in an axial direction around the hub of a first coupling part, these elements being fixed by their external front sides on the hub and by their internal front sides on a radial annular disc resting on the hub, and in which an external annular element is further provided which is fixed on a front side to a projecting edge of the annular disc and on its other front side to the second coupling part. The annular disc

  disposed between the two internal annular elements and fits

  radially on the hub also serves, in this case, apart from the support of the internal annular elements, to

  the support of the drive side of the outer annular element

  born. But we can just as easily foresee two elements annu-

  external laires which, like the internal annular elements, are connected by their sides located opposite the disc

ring disposed between them.

  According to a development of the invention, the annular elements and the metallic elements which are fixed on them

  consist of at least two independent annular segments

  pendants. In practice, it is advantageous to plan more

  of two independent annular elements. This depends essentially on

  the importance of mating trees. When it comes to a coupling of large shafts, it may be advantageous to constitute the annular elements

  elastic respectively by means of eight canceling elements

  independent or more. This not only facilitates sensi-

  the assembly of a coupling of shafts of this type and

  exchange during operation, but such a subdi-

  vision results in significant savings in manufacturing elastic ring elements for couplings of

  dimensions either important or extremely important.

  Shaft couplings intended for large drive powers are only required in

  special cases, and can therefore only be carried out individually

  dual. The production of closed elastic annular elements for very large couplings is linked to corresponding manufacturing risks which mean that the

  manufacturing costs of such couplings are on the whole

  ble difficult to calculate. For a long time, attempts have been made to mount several individual couplings in parallel for the transmission of very large powers. However, due to the disproportion of the space available in relation to the axial length required, limits are imposed on such couplings. The above-mentioned difficulties are avoided in a particularly simple way by using annular elements constituted by several independent annular segments.

  The metal elements used to fix the elements

  annular elements advantageously consist of steel with

  spring. Thanks to this constitution, the possibility of moving

  axial cement which is determined by the annular elements

  elastic is further increased.

  Regarding the constitution of the annulai-

  res metallic, it is advantageous that these, in the fixing positions, are projecting in the radial direction relative to the annular elements and that their projecting edges are located in planes perpendicular to the axis of rotation. In general, we use screws to achieve the

  removable fixing or mutual fixing of annular elements

  laires. It may then be advantageous to provide, on the

  connecting edges of metal elements, reinforcements-

  partial and projecting axially where the screws

fasteners are used.

  According to a preferred embodiment, the metal element

  lique provided on the external annular element and serving for the connection with the internal annular elements comprises on its internal periphery reinforcements projecting axially and arranged in peripheral direction, reinforcements which are

  jointed together the connection edges of the metal elements-

  internal annular elements and the annular disc

  laire, for example by means of bolts which are screwed in threaded bores parallel to the axis and formed in the reinforcements. According to another development of the invention, the support of the annular disc which constitutes the radial support of the elastic annular elements is formed in the form of a pivoting bearing on the hub, this bearing being movable axially on both sides. Thanks to this arrangement, the flexibility of the elastic annular elements in direct

  tion axially and in the direction of rotation is not hindered.

  The coupling of shafts according to the invention is also suitable for

  ment to the constitution of a double coupling. In the case of a double coupling of this type, there are two

  individual and symmetrical couplings one behind the other

  be in the axial direction, the outer annular elements of which

  nes are turned towards each other and rigidly fixed to an annular flange which bears radially on the hub of

  one of the individual couplings, but is movable in direction

  axial tion. In this arrangement, the external elastic annular elements of the two individual couplings are also supported radially. However, since this radial support only concerns one of the two individual couplings, the result is that the individual couplings can move radially with respect to each other. Thanks to a double coupling of this type, the elasticity in rotation is doubled while retaining the good offset properties

  in radial, axial and angular directions.

  The invention will now be explained in more detail using nonlimiting exemplary embodiments and with reference to the accompanying drawings in which: FIG. 1 is a view in axial section of a coupling of shafts comprising three elements elastic rings with several elements and concentric, FIG. 2 is an end view in the direction of the external coupling part comprising an internal breakthrough, and FIG. 3 represents the arrangement of a coupling

  double seen in semi-axial section with respect to the axis of rotation

common tion.

  The shaft coupling shown in the drawing by way of example of embodiment comprises, for the elastic connection of the two coupling parts 1, 2, two internal annular elements 3, 4, elastic and mounted in parallel, and an external annular element 5, elastic and mounted at the rear relative to the annular elements 3, 4. Each elastic annular element 3, 4 and 5 is subdivided into eight independent annular elements, as shown in FIG. 2. With regard to their angular dimensions, the annular segments 3a or 4a of the internal annular elements 3 or 4 coincide with the annular segments 5a of the external annular elements 5. In addition, the annular segments 5a are arranged in space so that their radial axes coincide respectively with the radial axes of the corresponding internal annular segments 3a or 4a. This means that between neighboring groups of internal and external annular segments 3a, 4a or 5a are provided narrow slots

  respective 6 over their entire thickness and oriented radially-

  is lying. Such an arrangement for covering the individual annular segments is advantageous for their assembly and disassembly. Needless to say, we can

  just as well choose a staggered layout. The function-

  the coupling of the shafts is not influenced by the

  arrangement of the annular segments.

  The elastic ring segments have a cross-section

  trapezoidal, with the most important parallel side on the outside. This shape saves material and weight taking into account the fact that in the external zones the stress on the torque is greater than in the internal zones. On the front sides, the annular segments are surrounded by flat metallic elements 3b, 4b or 5b whose faces

  lateral radials are applied against the lateral surfaces

  radial rales of the bodies of the internal segments made of an elastic material such as rubber or the like. The external metallic elements are fixed to the elastic bodies

  internal, preferably by vulcanization.

  As regards the internal annular segments 3a,

  4a, the metal elements 3b, 4b are extended to the ex-

  térieur by edges 3c or 4c which project radially with respect to the elastic body, these edges being curved with respect to the neighboring sections of the metallic elements so as to be arranged in planes perpendicular to the axis of rotation. For fixing the annular segments 3a to the coupling part 1 which is constituted in the form of an internal hub, a connection ring 7 is mounted so as not to allow relative rotation on the side

  front of the hub and it is fixed to the hub 1 by means of

  fixing positives not shown such as screws. The external connection edges 3c of the annular elements 3a are applied inside against the connection ring 7. The fixed connection between the connection edge 3c and the connection ring 7 is produced by bolts 8 on which are screwed the nuts 9 which are passed through bores in alignment with the two parts. In the embodiment shown, three bolts 8 are provided for each annular segment 3a, these bolts being arranged at the same distance

one another.

  A fixing of the same type is provided for the annular segments 4a on the opposite front side of the hub 1. In this case, a connecting disc 10 is fixed to the front side of the hub 1 by means of bolts 11. additional fixing means such as adjustment bolts which are forced into bores 13 parallel to the axis. As shown in Figure 1, a continuous spacer ring 14 is disposed between the connection edge 4c and the connection disc 10. In this case also, bolts

  8 fitted with nuts 9 are provided to tighten the connection edge.

  dement 4c on the connection disc 10, the nuts being arranged in bores in alignment with the connected parts

to each other.

  On the internal front sides of the annular segments 3a and 4a, the projecting edges 3d or 4d are applied against the opposite sides of an annular disc 15, which is supported

  radially on the hub 1 using a pivot bearing-

  allowing axial movement on both sides.

  To make this device, two flanged rings 16 are fixed to the annular disc 15, the rings being able to move in rotation and axially on a fixed bush 17

to hub 1.

  The annular segments 5a of the external annular element

  are also surrounded by metallic elements 5b. The ele-

  metal elements 5b which are adjacent to the coupling part

  plement 2 include, like the internal annular segments, a connecting edge 5c projecting outwards.

  Fixing is also carried out in this case by means of

  through lugs 18 and nuts 19.

  On the opposite front side, the metal element 5b

  includes a reinforcement 5d projecting axially. Preferably

  Rence, the reinforcement constitutes with the metallic element a component in one piece. In the reinforcement are provided threaded bores 20 parallel to the axis and intended to receive

  bolts 21. Each of these bolts 21 passes through bores

  ges'en alignment practiced in the connecting edges 3b, 4b as well as in the annular disc 15, and it is used for the common fixing of these parts with the outer annular segment 5a. On each individual annular segment 5a are provided respectively three fixing screws 20. All the fixing screws are arranged at the same distance from each other in peripheral direction, not only in the area of an annular segment, but also in the areas of

  transition between annular segment and annular segment.

  It is advantageous to make the metallic elements - annular segments made of spring steel. Flexibility

  axial of the shaft coupling is then even better.

  Due to the fasteners provided on the front sides of the

  annular segments which connect them to the coupling parts-

  rigid, both the internal annular segments and the external annular segments are subjected to torsional stress by the moment of rotation. The arrangement behind

  the others which is provided for the ring segments inter-

  -nes and the outer annular segments determines a flexi-

  significant flexibility of the coupling in the direction of rotation

  tion. Thanks to the subdivision of the elastic intermediate members into individual and independent annular segments,

  the exchange of annular elements does not cause any difficulty.

  An essential advantage comes from the fact that for the disassembly of the elastic intermediate members it is not necessary to move in the axial direction and relative to each other the machines connected by the shaft coupling. There is also no need to provide additional space for

  the assembly and disassembly of the elastic intermediate members

  ticks, as is necessary with known shaft couplings with closed elastic annular elements. In addition, the constitution in segments allows an economical manufacture of very powerful shaft couplings,

  and whose torque reaches, for example, 2,000 kmN.

  The rotary mounting on the hub 1 of the annular disc 15 provided for the radial support contributes to increasing the damping effect of the assembly when there are displacements

  relating to the load applied to the delivery

  plement, in relation to the friction losses appear-

  health at the level of surfaces in mutual contact.

  FIG. 3 represents a double coupling consisting of two individual couplings of the type which has just been described and arranged axially one behind the other. These individual couplings are constituted in the same way as the coupling shown in Figures 1 and 2 until the constitution of the external attachment of the outer annular segments. As shown in Figure 3, the individual couplings

  are arranged axially against each other and symmetrical-

  ment, the outer annular segments 5a being arranged one near the other. To interconnect the outer annular segments 5a, there is provided a bridging ring 21 comprising a flange ring 22 directed radially inward. The connecting edges 5c projecting from the

  annular segments 5a are applied against the front sides

  opposite rates of the bridging ring 21. Bolts 23 are mounted in bores in alignment with the parts to be connected

  in order to achieve their mutual fixing, these bolts bear

  both on their threaded end a nut 24 used for the

  rage. The flange ring 22 is supported radially by its cylindrical internal surface on the spacer ring 14 of

  the individual coupling on the right in the figure. Directly

  axially, the flanged ring 22 is movable on both sides with respect to the spacer ring 14 and therefore

  relative to the part constituting the hub of this coupling

  individual. This ensures that the couplings

  individual are axially movable relative to each other

  tre, -that is to say likely to deport. The radial support of the external annular segments of this coupling which is provided on one of the two individual couplings serves at the same time as radial support for the segments

  annulars 5a of the other individual coupling.

we

Claims (8)

  1. High elasticity shaft coupling, in which the elastic intermediate member which connects the two coupling parts consists of a combination of concentric annular elements made of an elastic material such as rubber or the like comprising at least two elements   annulars mounted in parallel and at least one annular element   the surface mounted on the back of the latter, metallic elements   which are used for the connection with the rigid coupling parts being fixed to the annular elements, preferably   by vulcanization, characterized in that two elements annu-   laires (3, 4) are arranged one against the other in the direction   axial around the hub (1) of a first coupling part-   ment, these elements being fixed by their front sides   external to the hub (1) and by their front sides inter-   nes on a radial annular disc (15) resting on the hub, and in that there is provided an external annular element (5) which is fixed on a front side to a projecting edge of the annular disc (15) and on its other front side to the second coupling part (2).   2. Shaft coupling according to claim 1, charac-   characterized in that the annular elements (3, 4 and 5) and the metallic elements which are fixed on them consist of at least two, and preferably eight, independent annular segments. 3. Shaft coupling according to claim 1 or 2, characterized in that the metal elements (3b, 4b and 5b), used for fixing the annular elements (3, 4 and 5)   are made of spring steel.   4. Shaft coupling according to any one of   Claims 1 to 3, characterized in that the elements   metal (3b, 4b and 5b), in the fixing positions, protrude in the radial direction relative to the annular elements and in that their projecting edges (3c, 4c and 5c)   are located in planes perpendicular to the axis of rotation tion.   5. Shaft coupling according to any one of   claims 1 to 4, characterized in that the elements   of metal include on their connecting edges   partial reinforcements and in axial projection.   6. Coupling of shafts according to any one of   claims 1 to 4, characterized in that the metal element   lique provided on the external annular element (5) and serving for the connection with the internal annular elements (3, 4) includes on its internal periphery reinforcements (5d) projecting axially and arranged in peripheral direction,   reinforcements to which the joint edges are attached   metal elements (3c, 4c) of the canceling elements   internal res (3, 4) and the annular disc (15), for example by means of bolts (20) which are screwed into threaded bores parallel to the axis and formed in the reinforcements (5d).   7. Tree coupling according to any one of   Claims 1 to 6, characterized in that the support for   annular discs on the hub consists of a pivoting bearing (16, 17) movable in the direction axial.   8. Use of a shaft coupling according to one   any of claims 1 to 7 to constitute a   double coupling, characterized in that two couplings   individual and symmetrical elements are arranged one behind the other in an axial direction, the annular elements of which   external (5) are turned towards each other and fixed rigidly   ment to a bridging ring which rests radially on the hub of one of the individual couplings, but is movable in axial direction.