FR2536130A1 - SLOTTED ELASTIC WASHER - Google Patents

Abstract

THIS SLOTTED ELASTIC WASHER 1 INCLUDES IN ITS BOTH SIDES CONCENTRIC CIRCULAR GROOVES 2 WITH PEAKS 3. TRANSVERSAL GROOVES 5 ARE PUNCHED IN THESE PEAKS. TO REDUCE THE RISK OF BREAKING CLAMED PARTS IN CONTACT WITH SUCH WASHERS, A PART WITHOUT A CROSS GROOVE SUCCESSES, IN THE RADIAL DIRECTION, AT ANY SLOT 5 OF A TOP 3.

Description

_ 1 1 The present invention relates to a washer

  split elastic with upper and lower sides

  f ereure have several circular grooves

  concentric with vertices protruding

  above said faces and the bottoms of which are set back with respect to them, while in these

  same faces are marked with transverse grooves

  dirty a short distance from each other, the som-

  puts grooves being, in the field of these rai-

  nures, driven back at least until about the level

said faces.

  A split elastic washer thus designed and on which the invention is based is described in

  the patent for invention DE 3 003 244 In this round

  delle known the transverse grooves are orient-

  tees in radial planes This provision has

  however for the disadvantage that the edges of the ra-

  transverse ribs, entering the workpiece clamped against the washer 9 form in this

  piece of radially oriented notches which

  due to increased stresses in said part

and can cause it to break.

  The problem to which the invention provides a solution

  lution therefore consists in perfecting a split elastic washer of the kind described in the preamble in order to

2536 130

  that with simple means we can reduce noticeably-

  the risk of rupture of parts tightened at the

tact of this puck.

  The solution to this problem consists, in accordance with the invention, in ensuring that each section

  of transverse groove of a top of groove suc-

  yields in the radial direction, in the next groove top, a part devoid of a transverse groove. Thanks to this arrangement, the forces exerted by the split elastic washer on the tight parts are subdivided and distributed over the surfaces.

  tightening these parts to a considerable extent-

  larger than previously, hence considerably lower voltage spikes in these parts, without reducing the blocking effect

  secured by the split elastic washer.

  In a preferred embodiment in the context

  of the solution according to the invention, for each section

  çon of transverse groove of a flute vertex follows in all the other flute vertices, in the radial direction, a part devoid of

transverse groove.

  Another advantageous embodiment, favorable from the point of view of the manufacturing technique, has the characteristic that the transverse grooves are shorter than the width of the washer and are, in the circumferential direction of the latter,

offset between them.

  The transverse grooves can also have a V shape whose angle points in the direction

circumference of the washer.

  In order to further reduce the risk of rupture of the washer itself, it is advantageous that, opposite the transverse grooves of one of the two faces of the washer, there are zones on its other face.

  devoid of transverse grooves.

  When the split elastic washer according to the invention comprises at least one, in particular several,

  concentric circular grooves, the invention pre-

  sees moreover, in order to reduce the risk of rupture of this washer itself 9 and parts

  pressed against it, that the grooves and their

  dishes placed on either side of the pre-

  feel rounded longitudinal edges o This also helps to reduce

  voltage spikes compared to the state of the art

  and, at the very least, to decrease considerably

  the risk of breakage due to nick effects.

  In this arrangement, a preferred embodiment

  is distinguished by the fact that the two sides of the round

they have a wavy profile.

  In an even more elaborate form of execution,

  the transverse grooves have long edges

gitudinal rounded.

  In this case, it is favorable, from the point of view

  of the manufacturing technique, that the grooves

  have a substantially trapezoidal profile with

  sides inclined towards each other in the direction

  tion of the bottom of these grooves In this arrangement, it is preferable that these flanks end in edges directed in the same direction as them, obtained by creep of the material and rising above the

flute tops.

  Thanks to these ridges the retention in position of the tightened parts is considerably improved and the

  large number of ridges that attack these sub-

  divide the entire clamping force into a large number of individual forces distributed over the clamping surfaces In addition, the clamping force which can be exerted by each crest corresponds only to

  a fraction of the total clamping force, hence r-

  the result is a reduced risk of rupture.

-4

  The grooves and grooves can be pointed

  relatively easily formed in the elastic washer-

  split tick, without the energy to be used

  for this exceeds an economically justifiable value.

  Exemplary embodiments of the invention are described in detail below and with reference to the accompanying drawing; On the latter figures 1 to 5 show, seen from above, annular segments of split elastic washers

  with transverse grooves of different designs

tions,

  Figure 6 is an elevational view of a round

  delle split elastic comprising two turns, FIG. 7 is an elevation view of another annular segment of split elastic washer,

  Figure 8 is a sectional view of the segment se-

  lon fig 7 seen along line VII-VII drawn on the latter, and

  Figure 9 is a sectional view of this Omeg seg-

  ment seen along the line I Xo IX traced in fig 7.

  The split elastic washers 1 manufactured se-

  According to the patent of invention DE 3 003 244 more

  concentric circular grooves 2 whose vertices 3 protrude above the surface of the

  washer and whose bottoms 4 are recessed relative to

port to said surface.

  At least in the vertices 3 of the grooves are in

  additionally formed, by punching transverse grooves

  dirty 5 In the examples according to fig 1 and 2 these grooves are rectilinear 9 S 9 extend over all the tops 3 of the grooves and, moreover, are arranged outside the radial planes so that in the radial direction a part devoid of groove transverse follows each section of transverse groove

: 5 of a flute top.

  In the examples according to Figs 3 and 4 are pre-

  -5 views of the transverse grooves 5 shorter than the radial width of the washer, which each extend substantially over a flute apex and which, in the circumferential direction, are offset from one apex to the next so that there also, in the radial direction, a part devoid of transverse groove follows each section of transverse groove of a flute top. In the example according to FIG. O 5 the transverse-grooves 5 are in the form of rafters whose points are directed in the circumferential direction of the washer There is a part devoid of transverse groove follows, in the radial direction, each section of transverse groove of a vertex

groove.

  The split elastic washers can be pre-

  feel in the form of a single turn, or, as represented

  felt in fig O 6, of several turns.

  To further reduce the risk of rup-

  In tight parts with these washers, it is advantageous, for example in the case of parts made of a relatively soft material, for example aluminum, to round the outline of the vertices 3, while

  only when it comes to parts whose service faces

  rage are superficially coated with syn-

  thetic or varnish the vertices 3 should be thin and with a sharp edge so that they can penetrate

  relatively easily in these coatings.

  In the case where the faces of the split elastic washers are intended to be applied against rough, irregular surfaces, for example of pig iron, it is advantageous to provide a large

  number of splines per washer face, i.e.

say more than two or three.

  In the examples illustrated in FIGS. 7 to 9, the two faces of the washer 1 have a corrugated profile, the -6 flanks of the grooves 2 gradually connecting

to those of rounded peaks.

  The transverse grooves 5 each have a substantially trapezoidal profile here with sides inclined one towards the other towards the bottom of the groove; their longitudinal edges are rounded In addition, the sides of these transverse grooves 5 are connected to ridges 6 directed in the same direction as them and

  surmounting the rounded tops 3 of the grooves 2.

  These ridges 6 have a rounded profile and, when

  punches the transverse grooves 5 in the corners

  put 3 grooves the profile of these grooves 5 as described above promotes the formation of

  these ridges 6 because the material pushed back out of the rai-

  transverse ribs 5 along the flanks thereof flows outward and ultimately forms the

say crest.

  So that the forces-to exercise to perform this

  material discharge remain within eco limits

  nomiques reasonable, there is intfr St that the depth of the transverse grooves 5 is not greater than that of the grooves 39 and it is even

  better that it be lower than the latter.

Claims (5)

  1 o Slotted elastic washer, the sides of which   upper and lower have several grooves   concentric circular res whose vertices protrude above said faces and whose bottoms are recessed with respect to them, while in these same faces are punched transverse grooves at a small distance from each other, the apex grooves being, in the field of these grooves, driven back at least up to approximately the level of said faces, this washer being remarkable in that with each section of transverse groove of a vertex (3) of groove succeeds in the radial direction, in the next groove crown, a part without transverse groove 2 Resilient washer according to claim 1, remarkable in that each section of transverse groove of a groove crown (3) succeeds in all the others groove tops, in the radial direction, a part without transverse groove 3 Elastic washer according to claim 1 or 2, remarkable in that the transverse grooves (5) are shorter that the width of the washer (1) and that they are offset from each other in the   circumferential direction of the latter.   4 elastic washer according to any one   of the preceding claims, remarkable in that   it has shaped transverse grooves (5)   of V whose angles point in the cir-   washer (1) spring washer according to any one   of the preceding claims, remarkable in that   opposite the transverse grooves (5) of one I of the two faces of the washer are in its other -8 -   face of the areas without transverse grooves.   6 Split elastic washer, the sides of which   lower and lower have at least one, no-   tap several concentric circular grooves   ques whose summits protrude above the   said faces and whose funds are in particular   line in relation to these faces, while in the latter are marked transverse grooves at a small distance from each other, the apex of the   grooves being, in the field of these grooves, re-   trod at least roughly to the level of said faces,   this washer being remarkable in that the can-   ribs (2) and their vertices (3) arranged on the side and   on the other side of the washer have longitu- rounded dinals.   7 elastic washer according to claim 6, remarkable in that its two faces have a corrugated profile. 8 elastic washer according to claim 6 or 7, remarkable in that the transverse grooves   (5) have rounded longitudinal edges.   9 elastic washer according to claim 8, remarkable in that the transverse grooves (5) have a substantially trapezoidal profile with sides inclined towards one another in the direction from the bottom of these grooves.   Elastic washer according to claim 8 or 9, remarkable in that the sides of the transverse grooves (5) are extended by ridges (6)   directed in the same direction as them, obtained by flu-   age of matter and rising above the peaks (3) grooves.