JP4411710B2 - Multi-layer sliding member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flat plate-like multilayer sliding member suitable for use in bearings such as radial bearings, thrust bearings, spherical bearings, sliding plates, and the like, and a porous metal sheet suitable for use therein.
[0002]
[Problems to be solved by the invention]
Multi-layer sliding members are known that include a backing metal, a low friction material fixed to the backing metal by an adhesive or sintering, and a reinforcing layer made of the backing metal and a sliding layer made of the low friction material. It has been.
[0003]
In a multi-layer sliding member in which a low friction material is fixed to the backing metal with an adhesive, the sliding layer may fall off or peel off from the reinforcing layer due to the chemical change of the backing itself or the low friction material due to the adhesive itself or the adhesive. Since the agent affects the final dimension (thickness) of the multilayer sliding member, a multilayer sliding member having a desired dimension (thickness) is obtained unless the adhesive is controlled with extremely high precision. In addition, if an adhesive having excellent heat resistance is not used, the sliding layer may fall off and peel from the reinforcing layer due to frictional heat.
[0004]
When a low friction material is sintered on the back metal, it is difficult to form a sliding layer with high accuracy and at a high speed, and the desired dimensional accuracy is maintained by sintering the low friction material on both sides of the back metal. It is relatively difficult to do and it is difficult to produce a multi-layer sliding member with the desired dimensions, as with an adhesive.
[0005]
Further, any of the above-mentioned multi-layer sliding members has poor elasticity against pressurization from the out-of-plane direction, and therefore a bearing formed from such multi-layer sliding members can be placed in the bearing mounting space with zero clearance. It is difficult to arrange, and it is necessary to manufacture the thickness of the multilayer sliding member and the bearing mounting space with considerably high accuracy, which causes an increase in manufacturing cost.
[0006]
The present invention has been made in view of the above points, and the object of the present invention is that the sliding layer is not easily detached from the reinforcing layer and does not peel off, and can be formed with a desired size. In addition, the sliding layer can be easily formed so as not to peel off on both sides of the backing metal, and it has elasticity in the out-of-plane direction and is suitable for use in bearings such as radial bearings, thrust bearings, spherical bearings, and sliding plates. Another object of the present invention is to provide a flat plate-like multilayer sliding member.
[0007]
[Means for Solving the Problems]
In the flat multilayer sliding member according to the first aspect of the present invention, a plurality of holes are formed, and at least one surface projects in an out-of-plane direction and surrounds one end of the hole. It has a porous metal sheet in which the protruding portion is integrally formed and a sliding layer that covers at least one surface of the protruding portion and the porous metal sheet, and one end of the sliding layer is surrounded by the protruding portion. The protrusion extends to the hole, and the protrusion is bent while narrowing one end of the hole on the inner peripheral end side by pressurizing the multilayer sliding member from the out-of-plane direction.
[0008]
According to the multilayer sliding member of the first aspect, the protrusion is formed on one surface of the porous metal sheet so as to squeeze one end of the hole by pressurization from the out-of-plane direction. Since the sliding layer covering one surface extends to the hole, the sliding layer can be firmly fixed to the porous metal sheet as the reinforcing layer without an adhesive, and due to a chemical change caused by the adhesive. The sliding layer can be eliminated from the porous metal sheet and peeled off, can be easily manufactured at high speed while maintaining the desired dimensional accuracy compared to sintering, and the bearing space has zero clearance due to the flexibility of the protrusion. In addition, even if the sliding layer is reduced due to wear, the sliding layer extended into the hole can be pushed out by bending of the protrusion, and the reduced sliding layer is automatically replenished. it can.
[0009]
In the multilayer sliding member of the second aspect of the present invention, in the multilayer sliding member of the first aspect, the hole has a substantially frustoconical shape, and the protruding portion has a substantially flange shape on the inner peripheral side thereof. One end on the small diameter side of the conical hole is reduced in diameter and surrounded.
[0010]
According to the multilayer sliding member of the second aspect, since the projecting portion surrounds one end on the small diameter side of the substantially frustoconical hole, the elasticity of the projecting portion can be preferably obtained. In addition, the anchor function of the protrusion can be further enhanced, and the above-described effects can be more preferably exhibited.
[0011]
In the multilayer sliding member of the third aspect of the present invention, in the multilayer sliding member of the first aspect, the hole is substantially cylindrical, and the protrusion is substantially cylindrical on the inner peripheral side thereof. The one end side of the hole is made to have a small diameter so as to surround the one end.
[0012]
According to the multilayer sliding member of the third aspect, the projecting portion surrounds the one end side of the substantially cylindrical hole so as to have a small diameter. Similar to the moving member, the elasticity and the anchoring function of the protrusion can be obtained more preferably, and the above-described effects can be more preferably exhibited.
[0013]
In the multilayer sliding member of the third aspect, a constricted portion may be formed at the base of the protruding portion so that the flexibility of the protruding portion can be more preferably obtained.
[0014]
The multilayer sliding member of the fourth aspect of the present invention is the multilayer sliding member of any one of the first to third aspects, further comprising another sliding layer that covers the other surface of the porous metal sheet. is doing.
[0015]
According to the multilayer sliding member of the fourth aspect, it is possible to provide a multilayer sliding member having sliding layers on both sides that can be used for, for example, a double-sided thrust washer.
[0016]
In the multilayer sliding member of the fifth aspect of the present invention, in the multilayer sliding member of any one of the first to fourth aspects, the sliding layer on one side and the other sliding layer on the other side are: It consists of a homogeneous or heterogeneous sliding material, and both sliding layers extend to the hole and are joined in the hole.
[0017]
In the multilayer sliding member of the sixth aspect of the present invention, in the multilayer sliding member of the fourth or fifth aspect, the other surface of the porous metal sheet protrudes in the out-of-plane direction, and Another annular projection that surrounds one end of the other hole that is not surrounded at one end by the projection is integrally formed, and this other annular projection is formed by another sliding layer on the other surface. In addition to being covered, by applying pressure to the multilayer sliding member from the out-of-plane direction, it is bent while narrowing one end of the other hole on the inner peripheral end side.
[0018]
According to the multilayer sliding member of the sixth aspect, other protrusions are integrally formed on the other surface, and the other protrusions press outwardly to the multilayer sliding member. Therefore, the other sliding layer can be firmly perforated without an adhesive as in the multilayer sliding member of the first aspect because the inner peripheral end is bent while narrowing one end of the other hole. It can be fixed to the metal sheet, and it can eliminate the slipping and peeling of the other sliding layer from the porous metal sheet due to the chemical change caused by the adhesive, and at the same time maintain the desired dimensional accuracy compared to sintering. In addition to being able to be arranged in the bearing space with zero clearance due to the flexibility of the other protrusions, even if other sliding layers are reduced due to wear, the other protrusions can be extended to the holes. It is possible to extrude other existing sliding layers and automatically reduce other sliding layers. It can be replenished.
[0019]
In the multilayer sliding member of the seventh aspect of the present invention, in the multilayer sliding member of the sixth aspect, the other hole has a substantially frustoconical shape, and the other protrusion has an inner periphery thereof. One end on the small diameter side of the other hole of the substantially frustoconical shape on the side is reduced and surrounded.
[0020]
In the multilayer sliding member of the eighth aspect of the present invention, in the multilayer sliding member of the sixth aspect, the other holes are substantially cylindrical, and the other protrusions are on the inner peripheral side. One end side of the other hole of the substantially cylindrical shape has a small diameter and surrounds the one end.
[0021]
The multilayer sliding members according to the seventh and eighth aspects can achieve the same effects as the multilayer sliding members according to the second and third aspects.
[0022]
In the multilayer sliding member according to the ninth aspect of the present invention, in the multilayer sliding member according to any one of the sixth to eighth aspects, a hole whose one end is surrounded by an annular protrusion and another annular sliding member. The other holes whose one ends are surrounded by the protruding portions are alternately arranged.
[0023]
In the multilayer sliding member of the ninth aspect, the above-mentioned effect can be obtained uniformly on both surfaces of the multilayer sliding member. Thus, by using the multilayer sliding member, uniform characteristics can be obtained. Can be manufactured.
[0024]
In the multilayer sliding member of the tenth aspect of the present invention, in the multilayer sliding member of any one of the first to sixth aspects, the multilayer sliding member has a strip shape, and the hole is formed of the multilayer sliding member. They are arranged in a staggered manner with respect to the longitudinal direction of the moving member.
[0025]
As a forming material of the porous metal sheet, as in the multilayer sliding member of the eleventh aspect of the present invention, a stainless steel plate (SUS), a cold rolled steel plate (SPCC), an electrogalvanized steel plate (SECC), brass Or although the metal sheet which consists of aluminum is preferable, this invention is not limited to these, You may consist of another metal sheet. The hole in the perforated metal sheet and the annular protrusion surrounding one end of the hole form a large number of beads (dome-shaped protrusions) by pressing or the like on the metal sheet, and cutting the top of this bead (burring process) It is formed by removing the same. It is not necessary to form protrusions for all the holes. For example, adjacent holes may be simple through-holes that are punch-pressed. A preferable example of the diameter of the hole is about 0.5 mm, but it may be larger or smaller than this. What is necessary is just to determine suitably the thickness of the metal sheet for forming a porous metal sheet in relation to a use.
[0026]
Examples of the material for forming the sliding layer include polytetrafluoroethylene resin as a main material and various fillers blended therein. In addition, it is well known in relation to compatibility with porous metal sheets and applications. Can be used.
[0027]
The flat plate-like multi-layer sliding member of the present invention is used for bearings such as flat and cylindrical radial bearings, thrust bearings, spherical bearings and sliding plates.
[0028]
The porous metal sheet of the present invention is suitable for use in the multilayer sliding member described above. The porous metal sheet has a large number of holes, and at least one surface has an out-of-plane direction. And an annular projecting portion that surrounds one end of the hole is integrally formed, and the projecting portion is formed on the inner peripheral end side by pressurizing the porous metal sheet from the out-of-plane direction. The one end of the hole is bent while being squeezed.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention and its embodiments will be described with reference to preferred examples shown in the drawings. The present invention is not limited to these examples.
[0030]
1 to 3, the flat multilayer sliding member 1 of the present example is formed with a large number of holes 2, and projects on the one surface 3 in the out-of-plane direction. A porous metal sheet 6 in which an annular projecting portion 5 surrounding one end 4 is integrally formed, and a sliding layer 7 covering one surface 3 of the projecting portion 5 and the porous metal sheet 6 are provided.
[0031]
As shown in FIGS. 4 to 6, the porous metal sheet 6 is formed with a large number of substantially frustoconical holes 2, and the holes 2 are pressed on the metal sheet 12 as shown in FIG. 7. Thus, a large number of beads (dome-shaped protrusions) 13 are formed, and the top portion 14 of the bead 13 is removed from the portion 15 by cutting (burring) or the like. The holes 2 are preferably formed in the metal sheet 12 so as to be arranged in a staggered manner in the longitudinal direction in the multilayer sliding member 1.
[0032]
The sliding layer 7 fills the hole 2 and extends to the hole 2, and the sliding layer 7 is fired on one surface 3 of the porous metal sheet 6 including the surface defining the hole 2.
[0033]
The projecting portion 5 surrounds one end 4 on the inner diameter side of the small diameter side of the hole 2 with a reduced diameter, and by pressing the multi-layer sliding member 1 from the out-of-plane direction X, the annular inner circumference The end 15 is bent in the A direction while narrowing one end 4 on the small diameter side of the hole 2.
[0034]
In the multilayer sliding member 1 described above, since the protruding portion 5 surrounds one end 4 on the small diameter side of the hole 2 by reducing its diameter on the inner peripheral side, the sliding layer 7 is firmly reinforced without an adhesive. It can be fixed to the porous metal sheet 6 as a layer, and the slipping layer 7 can be eliminated from the porous metal sheet 6 due to a chemical change caused by the adhesive, and can be eliminated, and desired dimensional accuracy compared to sintering. Can be easily manufactured at high speed, and can be disposed in the bearing space with zero clearance due to the flexibility of the protrusion 5, and even if the sliding layer 7 is reduced due to wear, the protrusion 5 The sliding layer 7 extended to the hole 2 can be extruded, and the reduced sliding layer 7 can be automatically replenished.
[0035]
In the above example, as shown in FIG. 8, a sliding layer 22 made of a sliding material that is the same or different from the sliding layer 7 is formed on the other surface 21 of the porous metal sheet 6. 22 may be filled in the middle of the hole 2 and joined to the sliding layer 7. The sliding layer 22 is formed by baking on the other surface 21 of the porous metal sheet 6 in the same manner as the sliding layer 7.
[0036]
By the way, the multilayer sliding member 1 described above is an example using the porous metal sheet 6 in which the protruding portion 5 is formed only on one surface 3, but as shown in FIG. 9 and FIG. 21 is also a porous metal sheet integrally protruding with another annular projecting portion 32 that projects in the out-of-plane direction and surrounds one end 31 of another hole 2 that is not surrounded by the projecting portion 5. 11 and 12, a sliding layer 22 made of a sliding material that is the same as or different from that of the sliding layer 7 is formed on the other surface 21 of the porous metal sheet 6 to form a multi-layer sliding. The moving member 1 may be obtained. The protrusion 32 in the multilayer sliding member 1 shown in FIGS. 11 and 12, like the protrusion 5, surrounds one end 31 on the small diameter side of the hole 2 by reducing its diameter on the inner peripheral side, While being covered with the sliding layer 22 on the other surface 21 and pressing the multi-layer sliding member 1 from the out-of-plane direction X, the one end 31 of the hole 2 is squeezed on the inner peripheral end 34 side in the A direction. To bend.
[0037]
In the multilayer sliding member 1 shown in FIGS. 11 and 12, the hole 2 whose one end 4 is surrounded by the protruding portion 5 and the hole 2 whose one end 31 is surrounded by the protruding portion 32 are alternately arranged. The sliding layer 22 is filled and extended to the middle of the hole 2 and joined to the sliding layer 7.
[0038]
According to the multilayer sliding member 1 shown in FIGS. 11 and 12, the sliding layer 22 can be firmly fixed to the porous metal sheet 6 by the protrusion 32 without an adhesive. The sliding layer 22 can be removed from the porous metal sheet 6 due to the change, and can be easily manufactured while maintaining the desired dimensional accuracy. Moreover, due to the flexibility of the protrusion 32, the sliding portion 22 is disposed in the bearing space with zero clearance. In addition, even if the sliding layer 22 decreases due to wear, the sliding layer 22 extended to the hole 2 can be pushed out by the deflection of the protrusion 32, and the reduced sliding layer 22 is automatically replenished. it can.
[0039]
In the above description, the hole 2 formed in the metal sheet 12 has a substantially frustoconical shape. Alternatively, as shown in FIG. 13, the hole 2 may have a substantially cylindrical shape. In this case, the annular protrusion 41 is formed so as to surround the one end 42 so that the one end 42 side of the hole 2 has a small diameter. In addition, you may form the constriction part 44 in the cyclic | annular base part 43 of the protrusion part 41 so that the flexibility of the protrusion part 41 can be obtained more preferably.
[0040]
The porous metal sheet 6 shown in FIG. 13 is manufactured as shown in FIG. That is, as shown in FIG. 14, a pair of molds 53 each having a hole 52 whose one end is defined by an annular inclined surface 51 is prepared, and the metal sheet 12 is sandwiched between the pair of molds 53, and the hole 52 has a circular shape. A columnar punch 54 is inserted to make a substantially cylindrical hole 2 in the metal sheet 12, and at the same time, a so-called annular burr 55 is formed at one end of the hole 2 along the inclined surface 51. After removing 53, the porous metal sheet 6 shown in FIG. 13 can be manufactured by applying a pressing force to the burr 55 to form the protruding portion 41.
[0041]
By forming the sliding layers 7 and 22 on both surfaces 3 and 21 of the porous metal sheet 6 in the same manner as described above, the porous metal sheet 6, the protrusion 41 and the porous metal sheet as shown in FIG. 15 are formed. Thus, the multilayer sliding member 1 having the sliding layers 7 and 22 covering the both surfaces 56 and 57 of the steel 6 can be obtained.
[0042]
The formation of the sliding layer 7 and the sliding layer 22 on each surface of the porous metal sheet 6 may be performed as shown in FIG. 16 or FIG.
[0043]
That is, as shown in FIG. 16, the coiled belt-like porous metal sheet 6 is guided to the hopper 65 containing the low friction materials 63 and 64 by the guide rollers 61 and 62, and the one surface 3 of the porous metal sheet 6. The low friction material 63 and the low friction material 64 are supplied to the other surface 21 of the porous metal sheet 6 while the low friction materials 63 and 64 are rolled onto the surfaces 3 and 21 of the porous metal sheet 6 by the rolling rolls 67 and 68, respectively. Thereafter, the porous metal sheet 6 on which the low friction materials 63 and 64 are rolled and attached is conveyed to a firing furnace (not shown) via the positioning rollers 69 and 70 and the turning roller 71, and the porous metal sheet 6 The sliding layers 7 and 22 made of the low friction materials 63 and 64 may be fired on the surfaces 3 and 21, respectively.
[0044]
Further, as shown in FIG. 17, the low friction material 63 is supplied from the hopper 75 to the surface 3 of the porous metal sheet 6, and the low friction material 63 is rolled to the surface 3 of the porous metal sheet 6 by the rolling rollers 76 and 77. After this rolling, the porous metal sheet 6 is reversely twisted to supply the low friction material 64 from the hopper 78 to the surface 21 of the porous metal sheet 6, and the low friction material 64 is applied to the surface of the porous metal sheet 6 by the rolling rollers 79 and 80. 21. After that, the porous metal sheet 6 to which the low friction materials 63 and 64 are rolled and attached is conveyed to a firing furnace (not shown), and the low friction materials are respectively applied to the surfaces 3 and 21 of the porous metal sheet 6. The sliding layers 7 and 22 made of 63 and 64 may be fired.
[0045]
【The invention's effect】
According to the present invention, the sliding layer can be formed to have a desired size without easily falling off and peeling off from the porous metal sheet as the reinforcing layer, and the sliding layer so as not to peel off on both sides of the back metal. And a flat plate-like multi-layer sliding member suitable for use in bearings such as radial bearings, thrust bearings, spherical bearings, and sliding plates, etc. be able to.
[Brief description of the drawings]
FIG. 1 is a plan view of an example of a preferred embodiment of the present invention.
2 is a cross-sectional view taken along the line II-II of the example shown in FIG.
3 is a partially enlarged view of the cross section shown in FIG. 2. FIG.
4 is a plan view of a porous metal sheet used in the example shown in FIG.
5 is a cross-sectional view taken along the line VV of the porous metal sheet shown in FIG.
6 is a partially enlarged view of the cross section shown in FIG. 5;
7 is an explanatory diagram of a method for forming holes in the porous metal sheet shown in FIG. 4;
FIG. 8 is a cross-sectional view of an example of another preferred embodiment of the present invention.
FIG. 9 is a cross-sectional view of a porous metal sheet used in an example of still another preferred embodiment of the present invention.
10 is a partially enlarged view of the cross section shown in FIG. 9;
11 is a cross-sectional view of an example of a flat plate-like multilayer sliding member using the porous metal sheet shown in FIG.
12 is a partially enlarged view of the cross section shown in FIG.
FIG. 13 is a partial cross-sectional view of a porous metal sheet used in an example of still another preferred embodiment of the present invention.
14 is an explanatory diagram of a method for forming holes in the porous metal sheet shown in FIG. 13;
15 is a partial cross-sectional view of an example of a flat plate-like multilayer sliding member in which the porous metal sheet shown in FIG. 13 is used.
FIG. 16 is an explanatory view of an example of a method for producing a multilayer sliding member of the present invention.
FIG. 17 is an explanatory view of another example of the method for producing a multilayer sliding member of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Multi-layer sliding member 2 Hole 3 One side 5 Protruding part 6 Porous metal sheet 7 Sliding layer

Claims (10)

A porous metal in which a large number of substantially frustoconical holes are formed, and an annular projecting portion that projects out of the plane and surrounds one end of the hole is integrally formed on at least one surface A flat multilayer sliding member comprising a sheet and a sliding layer covering at least one surface of the protruding portion and the porous metal sheet, the sliding layer extending to a hole surrounded by the protruding portion at one end. The projecting portion is formed by reducing the diameter of one end on the small diameter side of the substantially frustoconical hole on the inner peripheral side thereof, and by applying pressure to the multilayer sliding member from the out-of-plane direction. A flat-plate-shaped multilayer sliding member configured to bend while narrowing one end of the hole on the inner peripheral end side. A porous metal sheet in which a plurality of substantially cylindrical holes are formed, and at least one surface integrally projects with an annular protrusion that protrudes out of the plane and surrounds one end of the hole. A flat plate-like multilayer sliding member comprising a protruding portion and a sliding layer covering at least one surface of the porous metal sheet, the sliding layer extending to a hole surrounded by the protruding portion at one end. The projecting portion has a small diameter at one end side of the substantially cylindrical hole on the inner peripheral side thereof, surrounds the one end, and pressurizes the multilayer sliding member from the out-of-plane direction, A flat-plate-shaped multilayer sliding member configured to bend while narrowing one end of the hole on the inner peripheral end side . The flat multilayer sliding member according to claim 1 or 2 , further comprising another sliding layer covering the other surface of the porous metal sheet . The sliding layer on one surface and the other sliding layer on the other surface are made of the same or different sliding material, and both sliding layers extend to the hole and are joined to each other in the hole. A flat multilayer sliding member. The other surface of the porous metal sheet is also integrally formed with another annular protrusion that protrudes in the out-of-plane direction and surrounds one end of the other hole that is not surrounded by the protrusion. The other annular protrusion is covered with another sliding layer on the other surface, and is pressed on the inner peripheral end side by pressing the multilayer sliding member from the out-of-plane direction. The flat multilayer sliding member according to claim 3 or 4 , wherein one end of the hole is bent while being squeezed . 6. The other hole is substantially frustoconical, and the other projecting portion surrounds one end on the small diameter side of the other hole of the substantially frustoconical shape on the inner peripheral side. 2. A flat multilayer sliding member according to 1. 6. The other hole has a substantially cylindrical shape, and the other protrusion surrounds the one end so that one end side of the other hole in the substantially cylindrical shape has a small diameter on the inner peripheral side thereof. 2. A flat multilayer sliding member according to 1. The hole whose one end is surrounded by the annular projecting portion and the other hole whose one end is surrounded by the other annular projecting portion are alternately arranged . Flat multi-layer sliding member. The flat multilayered member according to any one of claims 1 to 8 , wherein the multilayered sliding member has a strip shape, and the holes are arranged in a staggered manner with respect to the longitudinal direction of the multilayered sliding member. Sliding member. The flat multilayered sheet according to any one of claims 1 to 9, wherein the porous metal sheet is made of stainless steel plate (SUS), cold rolled steel plate (SPCC), electrogalvanized steel plate (SECC), brass or aluminum. Sliding member.

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