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WO2018112368A1 - Bague non mobile et son procédé de formation - Google Patents

Bague non mobile et son procédé de formation Download PDF

Info

Publication number
WO2018112368A1
WO2018112368A1 PCT/US2017/066718 US2017066718W WO2018112368A1 WO 2018112368 A1 WO2018112368 A1 WO 2018112368A1 US 2017066718 W US2017066718 W US 2017066718W WO 2018112368 A1 WO2018112368 A1 WO 2018112368A1
Authority
WO
WIPO (PCT)
Prior art keywords
bushing
layer
cof
epoxy
outer layer
Prior art date
Application number
PCT/US2017/066718
Other languages
English (en)
Inventor
Yoshihiro Murakami
Original Assignee
Polygon (Hong Kong) Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Polygon (Hong Kong) Ltd. filed Critical Polygon (Hong Kong) Ltd.
Publication of WO2018112368A1 publication Critical patent/WO2018112368A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • F16C33/122—Multilayer structures of sleeves, washers or liners
    • F16C33/125—Details of bearing layers, i.e. the lining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/38—Layered products comprising a layer of synthetic resin comprising epoxy resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/16—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer formed of particles, e.g. chips, powder or granules
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/30—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being formed of particles, e.g. chips, granules, powder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • F16C33/203—Multilayer structures, e.g. sleeves comprising a plastic lining
    • F16C33/206—Multilayer structures, e.g. sleeves comprising a plastic lining with three layers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • F16C33/208—Methods of manufacture, e.g. shaping, applying coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
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    • B32B2255/26—Polymeric coating
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    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/021—Fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F16C2208/86—Epoxy resins

Definitions

  • the present invention pertains generally to a mechanical bushing, and, more particularly, to a non-walking bushing that resists rotation and drift in an axial direction.
  • a bushing is a bearing that is inserted into a housing or similar aperture to provide a bearing surface for a rotary application, such as a mechanical member that extends through the axis of the bushing and rotates in a continuous or reciprocal manner.
  • Composite and/or plastic bushings developed in the 20 th century, have been known in the art and used for some time. Most of the usage of these bushings are for mechanical operation under relatively light loading conditions.
  • a bushing and a method of forming the bushing, is provided in which an outer layer of the bushing has a higher coefficient of friction than that of a layer formed inward from the outer layer, such that "walking" of the bushing is inhibited during mechanical operation.
  • a bushing configured to reside between an outer housing and an inner rotatable member, the bushing including an inner layer configured to contact the inner rotatable member, and an outer layer configured to reside in a receiving portion of the outer housing and to contact the outer housing, wherein the outer layer comprises epoxy and metal particulates configured such that the outer layer has a coefficient of friction (COF) with a higher value than a COF of the inner layer.
  • COF coefficient of friction
  • a method of forming a bushing to reside between an outer housing and an inner rotatable member including forming an inner layer configured to contact the inner rotatable member, and forming an outer layer configured to reside in a receiving portion of the outer housing and to contact the outer housing, wherein the forming of the outer layer includes adding metal particulates to an epoxy such that the outer layer has a coefficient of friction (COF) with a higher value than a COF of the inner layer.
  • COF coefficient of friction
  • FIG. 1 illustrates a perspective view of a bushing according to an example embodiment of the present general inventive concept
  • FIGS. 2A-2B illustrate a cross section of the bushing of FIG. 1;
  • FIG. 3 is a photograph of a testing piece material including an epoxy mixed with glass fibers
  • FIG. 4 is a photograph of a testing piece material including an epoxy mixed with aluminum fibers according to an example embodiment of the present general inventive concept
  • FIGS. 5A-5B illustrate a friction test and comparison performed with the materials photographed in in FIGS. 3-4;
  • FIG. 7 is a flow chart illustrating a method of forming a bushing according to an example embodiment of the present general inventive concept.
  • a novel non-walking bushing and a method of providing the non-walking bushing, is provided so as to have at least two layers in a radial direction, at least the outer layer being provided with one or more materials having a high coefficient of friction (COF) that is not provided in at least the inner-most layer of the bushing.
  • COF coefficient of friction
  • the undesirable movement of the bushing relative to the bushing's housing may be referred to as "walking," and could result in the bushing becoming completely displaced from the housing.
  • increasing the COF to inhibit movement of the bushing relative to the housing contributes to a more desirable "non-walking" bushing.
  • other example embodiments of the present general inventive concept may provide the higher COF on the innermost layer of the bushing for other application such as, for example, an application in which the body housing the bushing is configured to rotate or otherwise move, and wherein it may be beneficial to have the movement of the bushing fixed relative to the body located inside the bushing.
  • Example embodiments of the present general inventive concept may provide valuable improvements in the inhibition of the walking bushing phenomenon in the use of composite and/or plastic bushings in pivot points of mechanical equipment.
  • the bushing needs to stay in the same position in the housing bore.
  • One method to prevent a walking bushing is to increase the interference of the outer diameter of the bushing and the inner diameter of the housing bore, or to decrease friction at the contact points of the inner surface of the bushing and the outer surface of the shaft (pin) so that the coefficient of friction (COE) of the shaft and bushing shall be smaller than that of the bushing and housing bore.
  • Various example embodiments of the present general inventive concept increase the friction forces of the face contact area at the outer diameter of the bushing and the inner diameter of the housing bore.
  • a bushing structure with multiple layers, wherein the inner layer and a reinforcement layer (backing layer) can be made by conventional methods such as using a smooth liner or special coating at the inner surface of the bushing.
  • a special low friction material may be used as the inner layer of the bushing while a reinforcement layer can use existing methods such as fiberglass reinforced thermoset plastics.
  • Various example embodiments of the present general inventive concept may add another outer layer, or modify a reinforcement layer, by winding or otherwise adding, imbedding, etc., metal particulates to the outer layer to increase the friction of the surface of the outer diameter of the bushing and the surface of the inner diameter of the housing bore.
  • the metal particulates may be added to the outer layer by a number of methods, using a number of materials, such as, for example, winding the layer with plastic impregnated metal fiber, adding plastic impregnated with short length metal fiber, adding metal powder to an epoxy, and so on.
  • FIG. 1 illustrates a perspective view of a bushing according to an example embodiment of the present general inventive concept.
  • the bushing 10 is of a conventional length and diameter, and is offered simply to show a perspective of a typical bushing. While the layers configured according to the present general inventive concept are not indicated in FIG. 1, it is understood that the different layers as described herein are provided. Example embodiments of the present general inventive concept are not limited by any of the dimensions illustrated in FIG. 1 or any of the remaining drawings/photographs.
  • FIGS. 2A-2B illustrate a cross section of the bushing of FIG. 1.
  • the example embodiment of the bushing 10 illustrated in FIGS. 2A-2B includes an inner layer 40 provided at the inner surface of the bushing 10 to contact a rotatable member residing therein, an outer layer 20 provided at the outer surface of the bushing 10 to contact an outer housing in which the bushing resides, and a middle or backing layer 30 provided between the inner layer 40 and outer layer 20 to reinforce the bushing 10 between those layers.
  • Other various example embodiments of the present general inventive concept may provide more or fewer layers, and in different configurations, without departing from the scope of the present general inventive concept. In the example embodiment illustrated in FIGS.
  • the outer layer 20 is an epoxy layer containing short metal fiber
  • the middle layer 30 is an epoxy layer containing glass fiber
  • the inner layer 40 includes polytetrafluoroethylene (PTFE).
  • the PTFE may be provided to the inner layer 40 in a number of ways, such as by mixing with an epoxy or coated on an epoxy.
  • a PTFE coating itself may be considered the inner layer 40 of the bushing.
  • the middle and inner layer may be combined to form one layer, the middle and outer layer may be combined to form one layer, and so on.
  • the present general inventive concept provides the addition of metal particulates to the outermost layer that contacts the housing, and some example embodiments may simply have the metal particulates provided throughout the bushing to form the outermost layer, with a coating of PTFE on the inner diameter of the bushing to provide the innermost layer.
  • the outer layer 20 is made of a cured epoxy containing aluminum fiber.
  • various example embodiments of the present general inventive concept may employ other metals, or combinations of metals, such as, for example, tungsten, copper, iron, brass, and so on. These and other metals and/or combinations of metals may be used in addition to, or in place of, the aluminum fiber.
  • the metal particulates may be in long or short fiber form, powder, etc. The metal particulates may be added at various times during the process of forming the material of the layer, and may be somewhat uniform throughout the outer layer, or concentrated near the outer perimeter of the outer layer.
  • the aluminum fiber may be added to the liquid epoxy during the manufacturing process before the epoxy is cured.
  • This outer layer is the key to holding the bushing in the housing bore and staying at the same position due to the increased COF of the metal infused outer layer abutting the steel or other housing material.
  • the middle layer 30 serves as the backing layer to reinforce the structure, and is made of epoxy with wound glass fiber.
  • the inner layer 40 is the thrusting layer made of PTFE lining or coating, or an epoxy with an imbedded PTFE, or the like.
  • FIG. 3 is a photograph of a testing piece material including an epoxy mixed with glass fibers.
  • the testing piece photographed in FIG. 3 is an epoxy to which glass fiber has been added, which represents a conventional bushing.
  • FIG. 4 is a photograph of a testing piece material including an epoxy mixed with aluminum fibers according to an example embodiment of the present general inventive concept.
  • the testing piece photographed in FIG. 4 is an epoxy to which aluminum fiber has been added, which represents the outer layer of a bushing according to an example embodiment of the present general inventive concept.
  • FIGS. 5A-5B illustrate a friction test and comparison performed with the materials photographed in in FIGS. 3-4.
  • one end of a testing bench 60 was rotated away from a flat surface 70 upon which it rested until a testing block resting on the testing bench overcame the friction that held it in place and began to slide downward.
  • the epoxy block 50 containing only the glass fiber began to slide downward when the bench 60 was rotated to a position of 19.2 degrees from the flat surface 70.
  • the epoxy block 80 containing aluminum fiber and glass fiber did not begin to slide downward until the bench 60 was rotated to a position of 26.4 degrees from the flat surface 70.
  • FIG. 5A illustrates the epoxy block 50 with glass fiber moving down the test bench 60 at 19.2 degrees and an arctangent of approximately 0.34
  • FIG. 5B illustrates the epoxy block 80 with glass fiber and aluminum fiber moving down the test bench 60 at 26.4 degrees and an arctangent of approximately 0.46
  • the arctangent represents the static COF
  • the result of the test shows that the epoxy block 80 with the added aluminum fiber has an approximately 35% increase of static friction compared to the epoxy block 50 without the aluminum fiber.
  • an example embodiment of the present general inventive concept with such an outer layer structure may increase the thrusting resistance by approximately 35%. This resistance directly affects the holding force of the bushing and inhibits the bushing from rotating in the housing bore and walking out from the housing bore.
  • the percentage of increase may be changed by the amount of metal particulates added to the epoxy, and/or by the type of metal particulates.
  • an epoxy with metal particulates will have a minimum of 25% increased static COF compared to an epoxy with only glass fiber.
  • FIG. 6 is a flow chart illustrating a method of forming a bushing according to an example embodiment of the present general inventive concept. It is understood that the numerical identifiers of the operations shown in FIG. 6 are provided merely to aid in the visual representation of the operations, but the operations are not limited to any order. Also, various example embodiments of the present general inventive concept may have more or fewer operations, in different combinations and/or sequences, and so on.
  • operation 610 of the example embodiment illustrated in FIG. 6 a first layer material is produced by adding glass fiber to an epoxy.
  • a second layer material is produced by adding metal particulates to an epoxy.
  • the first layer material is formed into an inner annular layer of the bushing.
  • the inner-most surface of the inner annular layer is coated with PTFE.
  • the second layer material is formed onto the outer-most surface of the inner annular layer to form an outer annular layer of the bushing.
  • FIG. 6 is merely one example embodiment of a method of forming a bushing according to the present general inventive concept.
  • one or more layers may exist between the inner-most and outer-most layer.
  • glass fiber may only be added to layers other than the inner-most layer, and/or may be added to the outer layer along with the metal particulates.
  • a metal powder may be added to the outer layer rather than, or in combination with, metal particulates.
  • the inner-most layer is simply a coating of PTFE.
  • the operations may not be as delineated as shown in the example embodiment illustrated in FIG. 6.
  • the epoxy or other base material may be formed continuously in a direction away from the innermost surface, and at some point a glass fiber winding may be introduced to the epoxy, and at a later point a metallic winding or powder may be introduced to the epoxy either along with or in place of the glass fiber.
  • Various other operations and structures may be employed in the process according to sound engineering judgment.
  • Various example embodiments of the present general inventive concept provide a non-walking bushing made of composite and/or plastics and having at lest two layers, the outer layer being wound with plastic impregnated metal fiber or impregnated with short length metal fiber or other fiber or its powder so as to have a high COF against the housing material, so that the bushing structure stops the bushing from rotating and/or walking out of the housing bore.
  • Various example embodiments of the present general inventive concept provide a production method to increase the COF by mixing a material having a higher COF into the liquid plastic material of a bushing, or by adding such material on the outer surface of the bushing before curing the liquid plastic during the structure building process.
  • Various example embodiments of the present general inventive concept may provide a bushing to reside between an outer housing and an inner rotatable member, the bushing including an inner layer configured to contact the inner rotatable member, and an outer layer configured to reside in a receiving portion of the outer housing and to contact the outer housing, wherein the outer layer comprises epoxy and metal particulates configured such that the outer layer has a COF with a higher value than a COF of the inner layer.
  • the metal particulates may include at least one of aluminum, tungsten, copper, iron, brass, or any combination thereof.
  • the metal particulates may be in fiber or powder form.
  • the bushing may further include at least one middle layer formed between the inner and outer layers, the middle layer being configured to reinforce the bushing.
  • the middle layer may include epoxy and glass fiber.
  • the COF of the outer layer may be at least 25% higher than a COF of the middle layer.
  • the COF of the outer layer may be at least 35% higher than the COF of the middle layer.
  • the inner layer may include or be coated with PTFE.
  • the inner layer may include epoxy and glass fiber, and may be coated with PTFE.
  • the outer layer may include epoxy, aluminum fiber, and glass fiber.
  • Various example embodiments of the present general inventive concept may provide a method of forming a bushing to reside between an outer housing and an inner rotatable member, the method including forming an inner layer configured to contact the inner rotatable member, and forming an outer layer configured to reside in a receiving portion of the outer housing and to contact the outer housing, wherein the forming of the outer layer includes adding metal particulates to an epoxy such that the outer layer has a COF with a higher value than a COF of the inner layer.
  • the metal particulates may include at least one of aluminum, tungsten, copper, iron, brass, or any combination thereof.
  • the metal particulates may be in fiber or powder form.
  • the method may further include forming at least one middle layer formed between the inner and outer layers to reinforce the bushing.
  • the inner layer may be a coating of PTFE formed on the middle layer.
  • the middle layer may include epoxy and glass fiber.
  • the forming of the outer layer may include adding an amount of the metal particulates such that the COF of the outer layer is at least 25% higher than a COF of the middle layer.
  • the outer layer may include glass fiber along with the epoxy and metal particulates.
  • the inner layer may include epoxy and glass fiber, and is coated with PTFE.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Manufacturing & Machinery (AREA)
  • Sliding-Contact Bearings (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

L'invention concerne une bague logée entre un boîtier externe et un élément rotatif interne, et un procédé de formation de la bague, la bague comprenant une couche interne conçue pour entrer en contact avec l'élément rotatif interne, et une couche externe conçue pour loger dans une partie de réception du boîtier externe et pour entrer en contact avec le boîtier externe, la couche externe comportant des particules d'époxy et de métal étant conçue de sorte que la couche externe présente un coefficient de frottement (COF) d'une valeur supérieure à un COF de la couche interne.
PCT/US2017/066718 2016-12-15 2017-12-15 Bague non mobile et son procédé de formation WO2018112368A1 (fr)

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US201662498099P 2016-12-15 2016-12-15
US62/498,099 2016-12-15

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909087A (en) * 1973-01-17 1975-09-30 Garlock Inc Composite bearings
US3958840A (en) * 1975-05-05 1976-05-25 Thiokol Corporation Flexible bearing having reinforcements
US6420652B1 (en) * 2000-05-22 2002-07-16 Cinch Connectors, Inc. Plastic bushing
US20080159671A1 (en) * 2006-08-02 2008-07-03 Miba Gleitlager Gmbh Anti-Friction Layer for a Bearing Element
US20120106882A1 (en) * 2010-09-28 2012-05-03 Saint-Gobain Performance Plastics Corporation Cast Fluoropolymer Film for Bushings

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909087A (en) * 1973-01-17 1975-09-30 Garlock Inc Composite bearings
US3958840A (en) * 1975-05-05 1976-05-25 Thiokol Corporation Flexible bearing having reinforcements
US6420652B1 (en) * 2000-05-22 2002-07-16 Cinch Connectors, Inc. Plastic bushing
US20080159671A1 (en) * 2006-08-02 2008-07-03 Miba Gleitlager Gmbh Anti-Friction Layer for a Bearing Element
US20120106882A1 (en) * 2010-09-28 2012-05-03 Saint-Gobain Performance Plastics Corporation Cast Fluoropolymer Film for Bushings

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
SARKAR, P ET AL.: "Reciprocating friction behavior of AI particulate glass fiber reinforced epoxy composite", MATERIALS TODAY: PROCEEDINGS, pages 2708 - 2717 *
SURESHA, B ET AL.: "The role of fillers on friction and slide wear characteristics in glass-epoxy Composite systems", JOURNAL OF MINERALS & MATERIALS CHARACTERIZATION & ENGINEERING, vol. 5, no. 1, 2006, pages 87 - 101, XP055511033 *

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