Norton pampus gmbh willich

Class - Gaskets made of plastics, especially fluid- and gas-tight rings. Class - Parts made of plastics for machines, especially engines. Trademark Elite is the largest free online trademark search, trademark monitoring, and tracking platform. We specialize in business, branding, and trademark protection.

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Trademark Classification Information Class Info. Trademark Goods and Services Description. Select the Filing Country: Loading…. Useful additives include, but are not limited to, a minor volume percentage e. The coefficient of friction between two surfaces is defined in the CRC Handbook of Chemistry and Physics 62nd Edition, as the ratio of the force required to move one surface over the other to the total force pressing the two together.

In heavier duty applications, such as for automotive or general industrial use, materials having relatively lower coefficients are preferred.

In the test a series of disks of predetermined dimensions are fabricated, each having a plastic or load bearing layer of a particular material to be tested. The load bearing layers of two nominally identical disks are pressed against opposite sides of a smooth steel plate at a predetermined pressure or load W. The steel plate is then pulled out from between the disks at a predetermined velocity.

As mentioned hereinabove, layer may also include common fillers. In this regard, since the present invention does not utilize a dispersion of PTFE to facilitate penetration thereof into porous bonze as taught by the prior art, the size of filler particles is generally not of concern. Rather, use of skived PTFE sheet in a preferred embodiment of the invention permits use of fillers of substantially any particle size and concentration provided PTFE is the continuing phase binding the particles together.

Various alternatives are available for adhesive As a further alternative embodiment, layers and are fabricated as a monolayer comprising a polymer blend. This effect may be increased by adding fillers as described hereinabove.

Moreover the voids defined by structures may be filled with a dispersion of the chosen polymer PTFE, PPS, a combination thereof, etc. For example, polyimide P84 available from Lending Co.

Bearing of the present invention is preferably fabricated by providing a substrate formed as a metallic sheet, with a cladding of bronze superimposed therewith to form an integral intermediate layer This cladding or intermediate layer is bonded to substrate using conventional cladding techniques involving application of heat and pressure to form an integrated composite.

This composite is then passed through a conventional calender roll engraved with the negative of the desired pattern of structures such as the honeycomb pattern shown in FIG. Bearing layer may be subsequently formed by laminating a conventional sheet of lubricious material, such as PTFE, using a suitable adhesive as described hereinabove.

The entire laminate is then preferably inserted into a conventional press under heat and pressure wherein load bearing layer is provided with outermost surface as shown in FIG. As formed, bearing is substantially complete. Once so fabricated, the bearing may be formed into various application specific configurations using conventional techniques.

In addition, a load bearing layer may be laminated on both surfaces of substrate to provide a double-sided bearing. Bearings , fabricated as flat sheets in the mainer previously described, may be formed into any number of bearing types, such as bushes or journal bearings, thrust washers, and skid plates, etc.

For example, bushes or journal bearings may be formed by cutting the bearing into strips. Each of these strips, in turn, may be formed into hollow cylinders, with load bearing layer disposed on the inside cylindrical surface thereof, similar to that shown in prior art FIG. The cylindrical bearings may then be flanged using techniques familiar to those skilled in the art, such as, for example, described in the "Norglide, Norton Performance Plastics" catalogue No.

PPL-E, dated November, , hereinafter the "Norglide catalogue" and which is hereby incorporated by reference in its entirety. Although a preferred method of fabrication has been described, steps thereof may be modified, eliminated or performed in varying sequence. For example, bearing may be alternatively fabricated by forming substrate into a desired configuration, such as, for example, a cylinder, prior to application of load bearing layer thereon.

In this regard, the substrate may be provided with structures as described hereinabove, then fabricated into a tube using any convenient method, with the structures disposed on either the inner, outer, or both cylindrical surfaces thereof.

Thereafter, load bearing layer may be applied to the tube in any convenient manner, such as, for example, by spray coating or dipping. Application of the load bearing layer may be performed either before or after flanging one or both ends thereof.

As a variation of this fabrication technique, substrate may be fabricated into a tube, by any conventional method such as hot or cold forming operations, including roll forming, piercing, drawing or extrusion processes to produce either seamed or seamless tubes. Once so formed, structures may be provided using a surface texturing technique such as a chemical etching process or the aforementioned laser treatment.

Load bearing layer may be applied thereafter, as previously discussed. In one example of a preferred embodiment of the present invention, a support was formed as a sheet of steel quality St4 1. This sheet was provided with a thickness of 0.

Structures were formed by passing support through a conventional calender roll engraved with the negative of the desired honeycomb pattern shown in FIG. The dimensions of the structures forming the honeycomb pattern were substantially as described hereinabove and shown in FIGS.

Parameters of the bearing layer were predetermined to provide a thickness v FIG. In another example, support was a sheet of 0. Remaining fabrication steps were substantially identical to the example discussed hereinabove to produce similar bearings A series of comparative experiments have been carried out to show the improvements of the present invention PI relative to the prior art DU and Norglide NG bearings described hereinabove.

The present invention bearing PI was fabricated as described hereinabove. A summary of tests conducted is provided in Table I. The tests for coefficient of friction were conducted on small 10 mm diameter disks of each of the DU, NG and PI bearings. Predetermined amounts of the bearing surfaces thereof were alternately removed from outermost surface thereof, then the coefficient of friction measured.

This provided a profile of the coefficient of friction of each of the bearings at various depths or degrees of wear within the bearing life. The tests were conducted utilizing test methodology disclosed hereinabove.

The results are shown in the following Table II. These results indicate the coefficient of friction of the DU bearing begins to increase relatively early in its life.

Moreover, the friction coefficient is not constant, so that the assembly for example, a rotating shaft and housing will not encounter the same operating conditions such as smoothness and heat evolution over its life. The value of 0. This result is surprising because one would expect this plateau to last only for the depth of the top, bronze free layer depth "v" in FIG. The specific mechanism that provides this surprisingly long low friction plateau is not known.

It is hypothesized, however, that this plateau extends to more than twice depth v due to the disposition of the bronze in discrete locations rather than being intermixed with polymer. Results for NG are provided as a reference. Because NG does not utilize bronze in the bearing layer and is homogeneous, the friction coefficient does not vary during its life. However, it is expected that the PI bearing will provide a better wear rate over time than the NG bearing.

In other words, it is expected that during actual use, the PI bearing will take substantially longer to wear to a given depth than the NG bearing. The aforementioned creep resistance test was conducted as follows. The load was then released and the samples allowed to recover for 15 minutes.

The thickness of the samples was then measured and the loss in thickness calculated. An alternate embodiment of the present invention was also fabricated having 25 weight percent of an aromatic polyester filler sold by Carborundum Co.

The value of heat conductivity was measured according to the manufacturer's instructions. The results shown below in Table IV show that the bearings of the invention PI are approximately three times better than NG, and are also better than DU at full thickness. This superior heat conductivity is apparently due to the structures forming a solid connection to metal support , to effectively form a fin structure extending from support towards the surface of load bearing layer In this connection, conduction values are even higher once bearing layer is worn down to structures depth v as shown in FIG.

Utilizing a sandblasted substrate did not result in significantly improved results. Samples of bearings were subjected to electrical conductivity tests substantially according to the conventional DIN standard, but for the following variations. The bearings of the present invention are more resistant to mechanical stresses than standard NG. In this regard, bearings of the present invention were fabricated using a steel substrate 0. These bearings were then formed into cylindrical bushes of the type generally shown in prior art FIG.

Upon inspection, the bushes of the invention did not show any delamination, but the NG samples delaminated. Thus, raised structures of the present invention, formed integrally with substrate and embedded into load bearing layer enable a relatively thick bearing layer of low friction self-lubricating material to be utilized. This provides bearings with a relatively long bearing life. Moreover, the bearing's coefficient of friction remains low and nominally constant over its life, even, surprisingly, once load bearing layer is worn down to, and into, structures 11 3.

Bearings are also advantageously resistant to creep and mechanical stresses, and are electrically and thermally conductive. The foregoing description is intended primarily for purposes of illustration.

Although the invention has been shown and described with respect to an exemplary embodiment thereof, it should be understood by those skilled in the art that the foregoing and various other changes, omissions, and additions in the form and detail thereof may be made therein without departing from the spirit and scope of the invention.

All rights reserved. Login Sign up. Search Expert Search Quick Search. Self-lubricated bearing. United States Patent A self-lubricating bearing is fabricated as a laminate of a metallic substrate and a series of raised structures formed integrally therewith and extending orthogonally therefrom. A fluoropolymer sliding or bearing layer is superposed with the substrate, with the raised structures embedded therein.

The raised structures serve to hold the bearing layer in place to help prevent it from sliding along the surface of substrate during bearing operation. This anchorage to the substrate enables a relatively thick bearing layer to be utilized to relatively reduce tendency to creep. Alternatively, the structures provide a bearing having a relatively thin load bearing layer with a relatively constant friction coefficient over its life, with the structures acting as thermal and electrical bridges for relatively high heat and electrical conductivity between the substrate and a supported article such as a rotating shaft.

The structures also may be in direct contact with the supported article to help prevent bedding-in. In this regard, the bearings are provided with a relatively low coefficient of friction, long bearing life, resistance to creep and mechanical stresses, and are electrically and thermally conductive. Click for automatic bibliography generation. Download PDF Having thus described the invention, what is claimed is: 1. A maintenance-free bearing comprising: a substrate having a surface; a plurality of structures disposed in spaced relation along, and extending substantially orthogonally from, said surface, said plurality of structures forming a three-dimensional, substantially uniform geometric pattern extending along said surface; and a load bearing layer superposed with said surface in engagement with said plurality of structures, wherein said structures are embedded into said load bearing layer.

The bearing as set forth in claim 1, wherein said substrate is substantially cylindrical. The bearing as set forth in claim 2, wherein said substrate comprises a hollow tube, at least one end of which is adapted for being flanged. The bearing as set forth in claim 1, wherein said substrate is fabricated from a metallic material. The bearing as set forth in claim 4, wherein said substrate is fabricated from steel. The bearing as set forth in claim 4, wherein said substrate is fabricated from aluminum.

The bearing as set forth in claim 1, wherein said load bearing layer comprises a lubricious plastic material. The bearing as set forth in claim 7, wherein said load bearing layer is selected from the group consisting of fluoropolymers, polyimide and aromatic ketones, and combinations thereof.