Plate bearing material used in the construction of the bearing with a curved sectional liners

 

The invention relates to a bearing device, namely, anti-friction coatings liners made in the form of plates. Plate bearing material is used for manufacturing the bearing design, intended for use as a carrier bearings water lubricated propeller shaft used on large marine vessels. Plate bearing material consists of the lower elastomeric layer having a top surface, a layer of slippery polymer alloy (PCA), having a top surface and a bottom surface. While specified upper surface of the specified layer of slippery polymer alloy (PCA) has many convex contact points specified lower surface of the specified layer of slippery polymer alloy (PCA) glued to the specified upper surface of the specified lower elastomeric layer. The technical result - the reduction of the friction coefficient and the wear rate. 2 C.p. f-crystals, 1 Il.

The technical field This invention relates to plate bearing material used in the construction of the bearing is intended for use as a carrier bearings water lubricated shaft grebeg is the construction of the bearing with the use as a bearing material of the elastomer due to its excellent ability to withstand corrosive fluids and abrasive wear, which are affected by foreign particles suspended in seawater, which are the shaft and bearing.

In one embodiment, the bearing insert material includes many that are evenly distributed around the circumference of the edges of the elastomer, which support the shaft by selective contact with him.

In another embodiment, the bearing insert material has a bearing contact surface is larger, made of elastomer, and in contact with the shaft along a circular area larger than the bearings with ribs. This type of bearing known as a bearing with a cylindrical bore or bearing with arched inserts (in some cases).

Bearing material for the bearing design with arched inserts are difficult to produce because of the tolerances that need to make a bearing. Still bearing material for arcuate inserts fastened to the inner surface of the bearing housing, and then the elastomer is mechanically processed to fit to the desired size. However, machining leaves deep scratches on the elastomer, significantly increase the coefficient of friction between under ecologo material for the bearing design with curved sectional liners has led to continuous improvement with the aim of increasing universality, the practicality and effectiveness.

Summary of the invention the Purpose of this invention is the creation of new variants bearing material for bearing with cylindrical bore or bearing with arched inserts. This invention provides a plate bearing material for arcuate sectional bearing shells having a lower coefficient of friction and the wear rate of reducing, at the same time, the cost of manufacturing.

These and other objectives, features and advantages of this invention will become more clear from the detailed description of examples of implementation, illustrated in the drawing.

In the drawing, a and b shows an isometric projection variants plates bearing material according to this invention, intended for use in the bearing design with curved sectional liners.

Detailed description the drawing shows variants of the plates bearing material for arcuate sectional bearing shells. Bearing material molded in the form of large flexible plates. The material is molded and fashioned him on a rough cloth or plate with multiple tabs. Molded plates are or izgotovlenie preferably, of homogeneous slippery polymer alloy (PCA), as described in U.S. patent 4725151 and 4735982. Preferably, the thickness of the layer of bearing material PCA was of the order of 0.125 inch. Then, when the vulcanization of the plate, glued to a sheet lining made of nitrile rubber. The lining is made of rubber makes the plate is flexible, and when worn it can be easily glued to the bearing housing of metal or composite using hardening at room temperature epoxy binder composition, or contact adhesive. Rubber lining quickly and easily grinded or polished on a lathe to obtain the required thickness of the entire plate for the particular size of the bearing. The layer of binder adds approximately 0.001 inch to the total wall thickness of the bearing. So there is no need to Polish or grind the surface of the bearing. The polished surface of the bearing increases friction and wear.

In the drawing, and you can see that the bearing plate material can be made, stacking in the form of lower layer 110 elastomer. The preferred elastomer is room H-212 catalog company B. F. Goodrich Company. Then on the elastomer stack top layer 112 slippery polymer alloy (PCA). PCA obliterates composition, in which thermoplastic is in a continuous phase, and thermosetting substance dispersed therein as the dispersed phase. In other words, unlike the mixture is formed thermoplastic binder having a thermosetting compound and dispersed therein a lubricant.

Thermoplastic compound can be any polymer having a high viscosity, low friction and good wear resistance. A special group of such polymers are numerous polyethylene ultra-high molecular weight (PASUNG), which are known in the art, and literature. The polyethylene is ultra-high molecular weight normally include such polyethylene is that when using the method of measuring the viscosity of the solutions have an average molecular weight of more than 2.5 million, i.e. approximately 3,0 million to approximately 7.0 million. A desirable range is from about 4 million to about 6.5 million, and the preferred range from about 5 million to about 6 million. Such polyethylene comes in a trading company Hoechst Celanese Corporation under the name GUR 413.

Polyethylene ultra-high molecular weight as well as other polymers, in General suitable for use in this izobreteny what about the friction when the shaft speed 0 rpm is 0.25 or less, preferably of 0.20 or less, and preferably 0.15 or less. Desirable thermoplastic compounds according to this invention have a viscosity when tested for impact strength according to Izod (ASTM D256) of $ 20 or more, and preferably 30 or more. However, the samples for testing, no dents, never broke down. Thermoplastic compounds according to this invention also have good abrasion resistance, as measured by tests on the abrasive effects of sand slurry. Test the abrasive effect of the sand slurry is a test of the company Hoechst Celanese Corporation, which is usually the test sample (131/4 inch) rotate at 1200 rpm for 24-hour period in the sludge, containing 2 parts water and 3 parts sand.

Use an effective amount of polyethylene ultra-high molecular weight, which forms a continuous phase in the PCA. Usually the amount of thermoplastic compounds sufficient to cover its layer connection thermoset rubber, which usually exists in the form of particles, and more preferably an amount in excess of this amount is required to cover the particles of rubber. Usually ispolzuya 90 weight %, preferably from about 40 weight percent to about 75 percent by weight, and preferably from about 55 weight percent to about 65 weight %.

Thermosetting compound is vulcanised rubber compound, which typically has low friction, and good oil - and water-resistance. Here, under the "low friction" is meant that the rubber bearings in the desired thickness range when lubricated with water to create hydrodynamic lubrication under normal operating speed of the axle (shaft). Thin rubber bearings, due to the elastic-elastohydrodynamics effect, create hydrodynamic friction when the shaft speeds lower than any other known bearing material. Under hydrodynamic lubrication understand the creation of the liquid film between the bearing and the rotating shaft. The term "oil - and water-resistant" means that the elastomer is not detrimental (it does not dissolve or soften), and the increase in volume caused by swelling in water is less than 5%, and preferably less than 3%.

As a rule, can be used any rubber compound with such friction and resistance. A special group of such compounds are numerous nitrile rubbers, and the x rubber Nusag manufactured by BF Goodrich Company. As a rule, preference is given to numerous more solid connections in the form of nitrile rubbers. A typical example of such a rubber is a compound H-201 (hardness And shore 805) manufactured by BF Goodrich Company. Another example is softer nitrile rubber, for example, the compound N-203, also manufactured by BF Goodrich Company, which has a hardness And shore approximately 705. Other rubbers include butyl rubber, EPDM, which is a rubber made from ethylene-propylene-diene monomers, and fluoro-elastomers based on copolymers vinylidenefluoride and hexaferrite, having considered the following recurring structure-CF-CF-CF-CF (CF) -. Such copolymers are sold by the company DuPont under the trademark "Viton". Although these other rubber compounds can also be used, yet nitrile rubbers are highly preferred because of their elasticity and creep.

An important aspect of the present invention is that vulkanisierung rubber compound may be first mixed in dry form with a thermoplastic compound prior to formation of their alloy.

Thus, the rubber is but to use conventional methods of grinding, for example, mechanical or cryogenic grinding. In most cases, the critical particle size of the vulcanized rubber compounds. Typically, the particles have a size smaller than the one at which they are able to pass through the sieve Tyler (Tyler) with cells of a certain size. So, vulcanized rubber compounds usually have a particle size of less than 35 mesh, preferably smaller than 65 mesh, and preferably less than 100 mesh. The amount of the vulcanized rubber in the PCA typically ranges by weight from about 10% to about 70%, preferably from about 12% to about 40%, and preferably from about 15% to about 30% of the total weight of the PCA.

The lubricant is generally added in the form of a solid substance consequently not in liquid form. In order to ensure good dispersion, typically, the lubricant is in the form of powder. The term powder is meant that the majority, at least 70%, 80% or 90%, and more preferably at least 95%, of the particles have a size smaller cell size sieve Tyler 100 mesh, that is 150 microns. It is desirable that the majority of the powder particles, typically 80%, 90% or even 95%, were less than 200 mesh, that is 75 microns. It is preferable that the majority of the particles of graphite powder, that is, 70%, 80% or 90%, were less than 325 m the lubricating properties. Under lubricating properties mean that the coefficient of friction of the surface of the formed ATP is lowered, is, for example, about 10%, and more preferably at least 20% or 30% in early wear. The lubricant must also be non-abrasive. The preferred lubricant is graphite. An example of a special graphite is sort of 117 And produced by Asbury Graphite Mills, Inc. Another special lubricant is molybdenum disulfide. Although not always preferred, molybdenum disulfide desirable when used in cases of dry friction, when there is no moisture, even in the form of vapor atmospheric moisture. You can also use silicone oil in an amount of from about 2% to about 10% by weight, and preferably from about 3% to about 6% by weight of the total weight of the PCA. The specific examples of silicone oils include 200 Fluid manufactured by Dow Corning. Another acceptable lubricant is PTFE (polytetrafluoroethylene) manufactured by Du Pont de Nemours E. I. Company.

Typically, the amount of lubricant is from about 0.5% or 3% by weight to about 25% by weight, preferably from about 1.0% to about 20% by weight, and preferably from about 2% to about 10% by weight of the total weight of the PCA.

Then on the top layer of the plate bearing material pattern is applied. At the direction of the axis. Each of the protrusions 114 separately when the lubricant fluid can become independent of the hydrodynamic bearing surface. The preferred method of applying this pattern is the room is very smooth, thin sheet of polyester plastic piece between stern loose knitted or loose woven cloth and the indentation of the sheet of polyester plastic and fabric into the surface of the bearing material PCA 22 before vulcanization. Preferably, the cloth was fabric 8708 catalog company Georgia Duck. Preferably as a sheet of polyester plastic material has been used brand MYLAR with a thickness of 0.003 inch. A sheet of polyester plastic smoothes the resulting layer of the PCA and which curves the corners of the projections 114. It should be noted that in order to ensure that the fabric can be removed after vulcanization, before pressing polyester plastic and fabric in the form of a single cloth material way known in the art, it is necessary to spray a substance that facilitates the extraction of forms, such as RTC 9110 manufactured by Chem-Trend. After the fabric and the sheet of polyester plastic placed over devulcanizing sectional bearing, they should be compressed, for example, by closing the form. Then m is warratny inch, and at a temperature of approximately 350oF. After this molding process, maintaining pressure, allow the temperature of the form to return to the value at ambient temperature. The form should be allowed to cool for approximately 1 hour after molding. It was found that the cooling of the composite under pressure facilitates the prevention of deformation of the finished product. Application of water on the outside of the form can also be used to reduce the cooling time of the form to 1 hour to prevent deformation of the end product.

In the drawing, b shows that it is possible to make another plate bearing material in accordance with the procedure proposed for composite, shown in the drawing, and getting in the composite, with the bottom layer 120 of the elastomer and the top layer 122 of the PCA, which has created in him faceted lugs, ground or point of contact 124. The ledges or platforms 124 protrude inwards in the direction of the axis and each of them individually can become independent of the hydrodynamic bearing surface when the lubrication fluid. However, the cut pattern on the top layer 122 is created using rubber shape having suitable is between the rubber and form ATP. It is preferable that the sheet of polyester plastic has a thickness of the order of 0.003 inch. A sheet of polyester plastic smoothes the resulting layer of the PCA and which curves the corners of the tabs.

It should be noted that for the hydrodynamic bearing was, in the upper layer of the alloy can be created patterns of different shapes and sizes that are not addressed here specifically.

Although the invention has been presented and described using illustrative options, professionals should be aware that, without going beyond the nature and scope of the invention, it is and it can be done foregoing and various other changes, omissions and additions.

Claims

1. Plate bearing material used for the manufacture of the bearing design, intended for use as a carrier bearings water lubricated propeller shaft used on large marine vessels and consisting of the lower elastomeric layer having a top surface; a layer of slippery polymer alloy (PCA), having a top surface and a bottom surface, and the specified upper surface of the specified layer of slippery polymer alloy (PCA) has a lot of you who Leena to a specified upper surface of the specified lower elastomeric layer.

2. Plate under item 1, characterized in that it further includes a layer in the form of a sheet of polyester plastic on the top surface of the specified layer of slippery polymer alloy (PCA), and the specified layer in the form of a sheet of polyester plastic glued to the specified layer of slippery polymer alloy (PCA) during vulcanization layer of slippery polymer alloy (PCA).

3. Plate under item 1, characterized in that the convex contact points consist of faceted lugs.

 

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