FR2643696A1 - BALANCING MASSELOT FOR ARTICULATED SHAFTS - Google Patents

Abstract

This counterweight is constituted by a balancing plate 10 having two fixing zones 11, 12, preferably constituted by welding points. Slots 13, 14 are provided between the attachment zones. These slots are arranged so as to be cut by a junction line which passes through the two fixing zones 11, 12. This gives the sheet 10 an advantageous deformability which allows it to adapt to the deformations of the rotating part on which it is mounted, without negative influence on the fixing of the sheet 10 or on the durability of the rotating part itself.

Description

The invention relates to a balance weight

  age for rotary shafts, especially for articulated shafts

  strips, consisting of a balancing plate representing a counterweight, which is fixed to the shaft by fixing zones. In the case of rotary shafts, in particular articulated shafts, it is known to provide sheet metal strips as balancing weights and to fix them by spot welds near the joints, in particular on the connection tube. The fixing of the weights results in almost all cases by a reduction in the mechanical resistance of the element concerned, in particular when several welding points have been provided. In a continuous strip of sheet metal, the weld points form points of initiation of cracks under the load. Furthermore, there remains the risk of the flyweights detaching under the effect of the torque since a deformation occurs. The element to which the balancing sheet bands are fixed twists under the effect of the torque transmission and it undergoes

  a deformation which is also transmitted to the fixing points

  tion of the sheet metal strip and which requests these points of

shear fixing.

  Based on this fact, the invention

  aims to offer a balance weight

  ge for articulated shafts which is made up and fixed

  so as not to cause negative influence when

  that it is fixed on the rotating shaft subjected to a

  ple, nor in the aspect of the durability of the tree itself

  not even under that of the attachment of the weights. In

  in particular, the invention aims to improve durability.

  According to the invention, this problem is solved by the fact that, for fixing, two point fixing zones are provided, spaced from one another and in that the balancing sheet has at least one slot or

  an opening between the fixing zones.

  By choosing the arrangement of the two fixing zones and the aperture or the slot provided between these zones,

  you can give the desired flexibility to the balancing sheet

  ge, so that the latter can adapt to defor-

  tree mations in the presence of a couple. The effort re-

  resulting from this deformation does not lead to a stress

  excessive citation of the fixation zones. At the same time, this also avoids the risk of starting cracks having

fixing areas for origin.

  According to another proposal of the invention, the fixing zones are preferably constituted by

solder points.

  Furthermore, according to the invention, it is proposed

  that the balancing sheet is rectangular.

  In order to be able to obtain the freedom of movement

  necessary in all directions, it is intended that, in the case of a rectangular balancing plate, the fixing zones are arranged on a diagonal of

the balancing sheet.

  A particularly advantageous effect is obtained when the fixing zones and the slot (s) and / or

  the aperture or the apertures are arranged so that the

  gene which joins the fixing zones cuts these slots or openings.

  To achieve the necessary flexibility, or

  necessary duction of the resistance to deformation, it

  it is expected that the slot (s) each leave from a sur-

  lateral face of the balancing plate.

  For the case where the balancing sheet has

  two slots, it is proposed that these slots leave res-

  pectively opposite side surfaces of the balancing sheet. However, it is also possible to plan

  two groups of slots which start respectively from

  opposite side faces of the balancing plate. In

  replacement of slots, and according to another characteristic

  as of the invention, two shaped openings can be provided

  of U which are arranged near the surfaces latera-

  the opposites of the balancing plate and whose branches

  They are arranged so as to point towards one of the two opposite lateral surfaces, and the fixing zones

  tion are arranged between said branches.

  According to a first alternative embodiment, in the case where two groups of slots are provided, and a slot of a first group and a slot of the other group may have a common axis. In the case where only two slots are provided, these slots can also

present a common axis.

  To get the flexibility you need in most

  In some directions, the slots are expected to extend

  tooth first perpendicular to the lateral surface

  where they leave then parallel to this same

lateral surface.

  Finally, to prevent rusting

  under the sheet, it is proposed to give the sheet of equi-

  release a U shape in the region between the fixing zones, and arrange the fixing zones

  in support regions which are formed by flaps

from the branches.

  Other features and advantages of the

  vention will be better understood on reading the description

  tion which follows of several embodiments of the invention, with reference to the accompanying drawings in which: Figure 1 is a partly sectional view of a

articulated tree; -

  Figure 2 is a section A-A of Figure 1, on an enlarged scale;

  Figure 3 is a top view of a first

  re embodiment of a balancing sheet; Figure 3a is a side view of the object of Figure 3; and Figures 4 to 8 are top views and

  profile of variants of balancing sheets

  ge. In FIGS. 1 and 2, 1 designates an articulated shaft which is provided with balancing plates 10 according to the invention. The articulated shaft 1 is composed of two universal joints 2 which are joined to each other by a

  connecting shaft, forming a connection locked in rotation

  tion but which admits a relative translation. The universal joints 2 are composed of an inner fork 3 and an outer fork 4. The two forks 3, 4 of

  each joint is joined together by a cross

  lon 5 so that you can play like char-

  in two planes. The outer fork 4 has

  a flange 6 which is used for connection to a control element

  china or vehicle that is motor or driven. The two inner forks 3 of the seals are assembled to parts which belong to the connecting shaft. Thus one of the inner forks 3 is part of a sliding outer element 7 which has in

  its bore a groove profile in which an element

  interior sliding slide 8 provided with a complete groove

  on its outer surface is mounted integral-

  ment in rotation but movable in axial translation.

  The inner sliding element 8 is assembled to the other inner fork 3 with the interposition of a tube

  connection 9. The connection tube 9 is generally used to adapt

  ter the length of the articulated shaft 1 if applicable

  tion considered. The articulated shaft 1 is balanced after assembly to obtain the absence of a runout in the

  measure which is required for the application case considered

  re. For this, we use made up mixtures

  by balancing sheets 10 which are preferably combined

  one or more of the connecting tube 9 or the element

  sliding outer 7. The balancing plates 10 are preferably fixed to the connecting tube 9 by

  spot welds. x this effect, and thus this res-

  as shown in FIGS. 1 and 2, two zones of connection are provided.

  sound 11, 12. The configuration of the balancing plate 10 itself and the position of the fixing zones 11, 12

  emerge from the description given with regard to the fig-

res 3 to 8.

  We can recognize on section A-A of the fig-

  re 2 that the balancing plate is far from the surface

  this exterior of the connecting tube 9 in the region comprising

  between the two fixing zones 11, 12, to form an open slot. This has the effect of concentrating the bearing surface on a minimum area so that the risk of rust formation under the sheet is avoided. It can also be recognized in FIGS. 1 and 2 that the two fixing zones 11, 12 are arranged one after the other in the direction of rotation of

the articulated shaft 1.

  In Figures 3 and 3a, we can see a pre-

  first embodiment of the balancing plate 10.

  The balancing sheet 10 is of rectangular configuration.

  laire. The lateral surfaces are designated by 10a, b, 10c and 10d. Two groups of slots 13, 14 are provided. The slots 13, 14 reduce the effective cross-section, so that, thanks to the flexibility which results from the slots 13, 14, the deformations which occur in the connecting tube can be compensated by a deformation of the balancing plate 10. It is easy to see that, thanks to the presence of slots 13 and 14 in the same group, a kind of double H is obtained. A slot 13 of a first group and a slot 14 of the other group have a central axis 18 common. Slots 13 and 14

  depart from opposite side surfaces 10c and 10d

  pectively of the balancing sheet 10. The slots 13,

  14 and the fixing zones 11, 12 are arranged in a manner

  nitre that a fictitious junction line 16 which joins the fixing zones 11 and 12 cuts the slots 13, 14 and their center line 18. This arrangement gives particular flexibility. It is visible that the junction line 16

  forms the diagonal of the rectangular balancing sheet

re 10.

  It can be seen in FIG. 3a that, in addition

  ment, the intermediate segment 19 lying between the zo-

  fastening nes 11, 12 has the shape of a U, on the branches 20 of which the bearing regions 21 are formed by folding. Thanks to this configuration, a kind of bridge is obtained which also allows variations in the relative positions of the two fixing zones 11, 12 in the presence of stress on the connecting tube 9, and

  which therefore facilitates a deformation of the balancing sheet

  ge 10. In addition, the support regions 21 of the sheet

  balancing 10 on the connecting tube 9 are concentrated

  very small areas, so you get

  in the intermediate segment 19 a slit between the over-

  outer face of the connecting tube 9 and the balancing sheet

  brage 10. This enlarged slot prevents the formation of rust under the sheet. At the same time, this reduces the risk of crack formation originating in the

fixing zones 11, 12.

  In the embodiment according to FIGS. 4 and 4a, two slots 13, 14 are provided, one of which leaves

  from the side surface 10c and the other from the side surface

  line 10d. We obtain in this way a configuration in

  Z. The two attachment zones 11, 12 are here also dis-

  laid on a junction line 16 extending diagonally

  nale. The slots 13, 14 are also of a configuration

  tion such that you get as much flexibility as

  possible and in this way an ability to deform

  balancing sheet and adaptation to the con-

  voltage and stress ditions of the connecting tube

  its 9 also as large as possible. You can see

  in FIG. 4a which corresponds to it that the sheet of balance

  Brage 10 is also of a bridge configuration.

  In the embodiment according to Figures and 5a, there are also provided here only two slots 13, 14 but these slots do not start from the narrow surfaces but on the contrary from the wide side surfaces 10a and 10b and are arranged in the middle of these surfaces. The sec-

  remaining residual in the central region per-

  advantageously puts the two segments of the sheet of equi-

  release 10 which are fixed to the connecting tube 9 by the

  fixing zones 11 and 12 to deform.

  Figure 6 shows yet another alternative embodiment of the balancing plate 10, in which

  two slots 13, 14 are also provided. The two windows

  tes 13, 14 extend obliquely from surfaces

  long opposite sides lOa and lO0b of the equilibrium sheet

  librage 10. The two fixing zones 11 and 12 are dis-

  placed roughly in the middle of the longitudinal dimension

  the two of the slots 13 and 14, and offset in the direction of the lateral surfaces 10c and 10d. The two slots 13,

  14 extend parallel to each other.

  In the embodiment according to FIG. 7, two slots 13, 14 are also provided and these slots extend first of all perpendicular to the surfaces

  side 10a, l00b from which they leave and then parallel

  along with these same side surfaces 10a, 0lob. The li-

  junction 16 passes through the two fixing zones 11 and 12 and cuts the slots 13 and 14. The orientation of the

  slots 13, 14 give rise to two small segments rec-

  tangular in the center of which are arranged the zones

fixing 11, 12.

  In the embodiment according to FIG. 8,

  two openings 13, 14 are provided, serving to give the sheet metal

  balancing 10 the deformability which is necessary. The two openings 13, 14 are of UJ shape. The branches 17 of each U point towards one of the

  short side surfaces, 10c or 10d respectively.

  In the region between two branches 17 of a

  13 or 14, the corresponding weld point is placed

  laying, which acts as an attachment zone 11 or 12.

  The two fixing zones 11 and 12 are arranged on

  the median axis corresponding to the large dimension longitu-

  dinal of the rectangular balancing sheet 10. We can see that the junction line 16 cuts the openings

13 and 14.

  Of course, various modifications may be made by those skilled in the art to the devices which have just been described only by way of examples.

  non-limiting without departing from the scope of the invention.

Claims (12)

R E V E N D I C A T I O N S CLAIMS   1. Balance weight for rotating shafts   tifs, especially for articulated trees, composed of a sheet-   the balancing representing the counterweight and which is fixed to the shaft by fixing zones, characterized in that, for fixing, there are provided two point fixing zones (11, 12) spaced apart from one other and in that the balancing plate (10) presents   minus a slit or an opening (13, 14) in the region   taken between the two fixing zones (11, 12).   2. Balancing weight according to the claim   tion 1, characterized in that the fixing zones   (11, 12) are formed by welding points.   3. Balance weight according to the claim   tion 1, characterized in that the balancing tdle   (10) is of rectangular configuration.   4. Balancing weight according to the claim   tion 1, characterized in that the fixing zones   (11, 12) are arranged on a diagonal (16) of the sheet the balancing (10).   5. Balancing weight according to the claim   tion 1, characterized in that the fixing zones (11, 12) and the or each slot (13, 14) or the aperture or each aperture are arranged so that the junction line (16) which joins the zones of fixing (11, 12)   cuts the slit or slits or the openwork or openwork.   6. Balancing weight according to the claim   tion 3, characterized in that the slot or each slot (13, 14) starts from a lateral surface (10a, b, c, d) of the balancing plate (10).   7. Balancing weight according to the claim   tion 5, characterized in that, for the case where the balancing sheet (10) has two slots (13, 14), these   slots respectively start from the two lateral surfaces   the opposites (10a, b or 10c, d) of the balancing plate (10).   8. Balancing weight according to the claim   tion 6, characterized in that two groups of slots (13, 14) are provided which start respectively from the lateral surfaces (10c, dY of the balancing plate (10).   9. Balancing weight according to the claims   1, 3 and 5, characterized in that two are provided   openings (13, 14) U-shaped which are arranged near   mite of opposite lateral surfaces (10c, d) of the sheet   balancing (10) and whose branches (17) are available   to point, in each U, to one of the two sur-   opposite side faces (10a, lob) and the fixing zones   tion (11, 12) are arranged between the branches (17).   10. Balance weight according to the claim   tion 8, characterized in that a slot (13) of one group and a slot (14) of the other group have a line common median (18).   He. Balancing weight according to the claim   tion 7, characterized in that the two slots (13, 14)   have a common center line (18).   12. Balancing weight according to the claim   tion 7, characterized in that the slots (13, 14) first of all extend perpendicular to the surface   lateral (10a, b) from which they start and then parallel   the same lateral surface (10a, b).   13. Balancing weight according to the claim   tion 1, characterized in that the balancing plate (10) has a U-shaped configuration in the region (19)   between the fixing zones (11, 12) and the zo-   fixing nes (11, 12) are associated with regions   support (21) formed by folding down from the branches ches (20).