FR2542399A1 - MATERIAL SHEET FOR BEARING - Google Patents

Abstract

SHEET IN COMPOSITE MATERIAL FOR BEARING, PREFERRED RADIAL. THE LONGITUDINAL AND OR TRANSVERSAL BARS 3 OF A PERFORATED SHEET 1 PROVIDED WITH OPENINGS 2 ARE CORRUGATED. THE SHEET IS THEN COATED WITH AN ANTI-FRICTION LAYER OF PLASTIC MATERIAL WHICH CAN BE SUBJECT TO SLIDING AND FRICTION EFFORTS. MECHANICAL INDUSTRY.

Description

Sheet of material for bearing.

  The present invention relates to a sheet of bearing material, used as bearing lining, preferably radial bearings, consisting of a metallic support layer provided with openings and

  wearing an anti-friction layer made of plastic material

  which may be subject to sliding

  friction and possibly containing additives that improve the slip or

friction.

  A sheet of bearing material of this type makes it possible to adapt to the deformations of the geometrical shape of the bearing, occurring when the housing is subjected to loads. In addition, the sheet made of bearing material has the advantage of

  good heat dissipation, so that when

  this, the plastic anti-friction layer does not

  not warmer than the purely mechanical

  that solicited in an identical way, and that

  do not run the risk of destroying the

the material for bearing.

  Sheets of bearing material intended

  born to fill radial bearings are already known

  long enough, in various forms of reali-

  J sation Thus it is proposed, in the patent No. 963, a sheet of bearing material constituted

  a wire cloth whose entry points

  The disadvantage of this sheet of bearing material, however, is that the metal fabric frays, in particular on its marginal parts, when it is stamped or when it is stamped. Furthermore, there is the danger that the frayed wires will come into play in the bearing, which will damage the bearing or destroy it, after a relatively short service life. To prevent this, it is proposed to DE No. 22 05 008 , a sheet of bearing material made of a metal sheet coated with a sintered fluoropolymer, the crossing points of the intersecting wires being welded to one another

  by a subsequent heat treatment but its stability

  relatively low form is a disadvantage of assembly, which prevents the automatic installation of the sheet of bearing material in bearing bushings and in bearing shells

  to improve the stability of the shape by using,

  EP-A-81 200 501, a diamond-shaped expanded metal gate made of a forged aluminum alloy having an elongation at break 65 of 8 to 20% and a Brinell HB hardness of 35 to 65 this grid being coated with an anti-friction layer of polytetrafluoroethylene, added with 10 to 50% by volume of glass fibers and 5 to 25% by volume of lead.

  However, it is not enough to satisfy all the

  imposed, because its ability to bear the

  loads is comparatively smaller transverse-

  to the axis of rotation only in the axial direction. The invention therefore aims at a sheet of material

  for the type mentioned at the beginning of this

  which, without impairing its good ability to adapt to the shape of the scope, and in particular without impairing its ability to withstand loads, is improved by the fact that its ability to bear loads is the same transversely

  and perpendicular to the axis of rotation.

According to the invention, the bars

  longitudinal and / or transversal of a perforated sheet.

  made with punched openings and forming the support layer are corrugated by stamping, the

  openings being arranged in

  nal or oblique Thanks to the corrugation of the perforated plate, at the same time a stiffening is obtained and thus a greater ability to withstand loads. The perforated plate is advantageously arranged

  so that the surface of the openings

  30 to 50% of the total surface area of the perforated sheet. Such a ratio provides both a good adaptability and a sufficient ability of the sheet of bearing material to be supported.

the charges.

  According to the invention, the perforated plate has

  square or rectangular openings with a length

  L of the aperture from 0.3 to 1 mm and preferably

from 0.3 to 0.8 mm.

  For the width or thickness S of the bars

  the dimensions which can be calculated by the product of the width of the opening L x 0.5 have proved advantageous As the perforated sheet must absorb stresses occurring essentially in service, the ratio of the width or thickness S bars which may be optionally different in the longitudinal and transverse direction, the width L of the openings, plays a determining role The ratio of the width L of the openings to the width or thickness S of the bars is determined by considerations Operating. The bearing surface of the perforated sheet must be as rigid as possible, that is to say

  should not deform under the load of the rotational axis.

  which must fulfill its role, even after break-in.

  On the other hand, it is necessary to ensure that the sheet

  Bearing material Suitable for deflections of the geometrical shape of the bearing surface occurring when the

  bearing housing is subject to efforts, and

  the contact surface of the pad that is born

  The optimum ratio of the length L of the

  to the width or thickness S of the parts

  solid is in the range of 1.5 to 2.

  To ensure sufficient attachment of the plastic anti-friction layer to the perforated plate, the plastic thickness N of the corrugated corrugated sheet, that is to say the gap between the top and the hollow of the corrugation of the bar, must be

equal to S x 1.75.

  It is recommended to use steel, nickel, nickel alloys or aluminum as the material for the perforated plate, but to allow sliding on the sheet of material

  for a limited period of time (duration of

  assistance), when

  unfavorable operating conditions that do not have

  metal materials have been used.

  for standard bearings, lead and tin, copper and lead alloys,

  alloys for aluminum bearing and alloys

  Al Mg 3 and Al Mg Sil type aluminum gums.

  The perforated sheet is coated with a layer of

  slip and friction, made of a thermo-

  plastic or thermosetting material, such as

  for example, polyvinylidene fluoride,

  tetrafluoroethylene or poly (methylene oxide) or

  in a similar matter, so that the thick

  layer on the tops of the undulations

from 20 to 50 microns.

  The slip or friction layer may contain separately or in combination in amounts of 5 to 50% by weight, additives such as glass fibers, plastic fibers, lead powder particles, graphite particles, of the

  bronze beads, glass beads or other pro-

  similar products, slowing down or improving

slip or friction.

  In particular load cases, it may be advisable to interpose a layer of adhesion between the perforated sheet and the anti-friction layer.

plastic material.

  The sheet of shaped bearing material according to the invention is shown, by way of example, in the drawing and is explained in a more precise manner in the following: Drawing: FIG. 1 is a plan view of a sheet metal perforated having square openings, and Figure 2 is a sectional view of the sheet

  perforated along the line I-I of Figure 1, the

  anti-friction che of plastic being applied.

  In a perforated plate 1 made of an aluminum alloy of the Al Mg 3 type, having a tensile strength of 6 = 180 N / mm, a yield strength of B 2 0, 2 = 80 N / mm, an elongation at rupture 65 =

  17% and a Brinell hardness HB = 45, and whose opening

  square tees 2 have a length L of 0.5 mm each and whose bars 3 have a width S of 0.25 mm each, the bars 3 are shaped by punching so that the plastic height N of the perforated plate 1 0.44 mm Perforated sheet 1 is coated with one layer

  anti-friction 4 polytetrafluoroethylene which

  holds 15% of glass fibers having a length of 0.5 to 0.75 mm and 20% of glass beads having a diameter of 10 to 100 microns The antifriction layer 4 is applied by sintering on the perforated sheet so that that the plastic material is hooked on the back of the perforated plate 1 and that there is, on the vertices of the corrugations on the side of the trunnion, a protective layer of 25 microns

thick, after calibration.

  The sheet of bearing material shaped according to the invention is characterized in particular by a

  good form stability and can be uniformly

  element transversely and axially with respect to

the axis of rotation -

Claims (1)

1 Bearing material sheet as a packing for bearings, preferably radial bearings, consisting of a metal support layer provided with openings and coated with an anti-friction layer of a plastic material which can be subjected to sliding and friction forces and possibly containing additives which improve sliding or friction, characterized in that the longitudinal and / or transverse bars (3) of a perforated plate (1) provided with openings (2) obtained by stamping and forming the support layer are corrugated. 2 Sheet according to Claim 1, characterized in that the apertures (2) are arranged in rows, diagonally or obliquely offset. 3 Sheet according to claim 1 or 2, characterized in that the surface of the openings (2) represents from 30 to 50% of the total area of the perforated sheet (1). 4 Sheet according to one of claims 1 to 3, characterized in that the width L of the square or rectangular openings (2) is between 0.3 and 1 mm, preferably between 0.3 and 0.8 mm. Sheet according to one of Claims 1 to 4, characterized in that the width or thickness S of the webs of the perforated plate is 0.5 x the width L of the apertures. Sheet according to one of Claims 1 to 5, characterized in that the width or thickness S of the webs is different in the longitudinal direction and the transverse direction. Sheet according to one of Claims 1 to 6, characterized in that the ratio of the length L of the apertures (2) to the width or thickness S of the webs is in the range of 1, 5 to 2. Sheet according to one of claims 1 to 7, characterized in that the plastic thickness N of the perforated corrugated sheet (1) is 1.75 x the width or thickness S of the bars. 9 sheet according to one of claims 1 to 8, characterized in that the perforated sheet (1) is made of steel, nickel, nickel alloys, aluminum, and materials for bearings based on lead and lead. tin, of copper and lead alloys, of alloys for bearings based on aluminum or aluminum alloys of Al Mg 3 and Al Mg Sl type. Sheet according to one of Claims 1 to 9, characterized in that the perforated sheet (1) is coated with an anti-friction layer (4) of thermoplastic or thermosetting material, so that the thickness of the anti-friction layer on the tips of the peaks of the corrugations of the perforated sheet is between 20 and 50 microns. Sheet according to one of Claims 1 to 10, characterized in that the anti-friction layer (4) contains, separately or in combination, amounts of 5 to 50% by weight, additives such as glass fibers, plastic fibers, lead powder particles, graphite particles, bronze balls, glass beads or other similar products, slowing wear or improving slippage or friction. Sheet according to one of the claims   1 to 11, characterized in that an adhesion layer is interposed between the perforated sheet (1) and the layer   anti-friction plastic (4).