WO2006047435A1 - Multiple radial spring rate pivot bushing and method of making the same - Google Patents

Multiple radial spring rate pivot bushing and method of making the same Download PDF

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Publication number
WO2006047435A1
WO2006047435A1 PCT/US2005/038219 US2005038219W WO2006047435A1 WO 2006047435 A1 WO2006047435 A1 WO 2006047435A1 US 2005038219 W US2005038219 W US 2005038219W WO 2006047435 A1 WO2006047435 A1 WO 2006047435A1
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WO
WIPO (PCT)
Prior art keywords
nonelastomeric
elastomer
bonding surface
inner member
outer member
Prior art date
Application number
PCT/US2005/038219
Other languages
French (fr)
Inventor
Paul Balczun
Original Assignee
Lord Corporation
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 Lord Corporation filed Critical Lord Corporation
Publication of WO2006047435A1 publication Critical patent/WO2006047435A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/84—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks by moulding material on preformed parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/38—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin, i.e. bushing-type
    • F16F1/3842—Method of assembly, production or treatment; Mounting thereof
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/38—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin, i.e. bushing-type
    • F16F1/387—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin, i.e. bushing-type comprising means for modifying the rigidity in particular directions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/34—Feeding the material to the mould or the compression means
    • B29C2043/3444—Feeding the material to the mould or the compression means using pressurising feeding means located in the mould, e.g. plungers or pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/02—Transfer moulding, i.e. transferring the required volume of moulding material by a plunger from a "shot" cavity into a mould cavity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/258—Tubular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/709—Articles shaped in a closed loop, e.g. conveyor belts
    • B29L2031/7096—Rings or ring-like articles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining

Definitions

  • the present invention relates to hood pivot bushings and methods of making hood pivot bushings with multiple spring rates. More particularly the invention relates to vehicle hood pivot bushings and methods of making vehicular hood pivot bushings with multiple radial spring rates.
  • the invention includes a method of making a multiple radial spring rate pivot bushing.
  • the method includes providing a nonelastomeric inner member having an outer circumference bonding surface and a bore with a center bore axis, preferably with the center bore axis offset from a center axis of the inner member outer circumference.
  • the method includes providing a nonelastomeric outer ductile member having an inner Attorney Docket: IR-3464 (MVE)
  • the method includes providing an elastomer.
  • the method includes providing a bushing mold for receiving the nonelastomeric inner member and the nonelastomeric outer member with the nonelastomeric inner member held in the nonelastomeric outer member axial bore.
  • the method includes molding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer, with the elastomer " bonding to the inner member outer circumference bonding surface while inhibiting a bonding of the elastomer to an elastomeric void section of the outer member inner circumference bonding surface.
  • the method includes deforming the nonelastomeric outer ductile member in towards the nonelastomeric inner member wherein the elastomeric void section of the nonelastomeric outer ductile member contacts the elastomer.
  • the invention includes a method of making a pivot bushing.
  • the method includes providing a nonelastomeric inner member having an outer circumference bonding surface.
  • the method includes providing a nonelastomeric outer member having an inner circumference bonding surface.
  • the method includes providing an elastomer.
  • the method includes bonding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer bonding to the inner member outer circumference bonding surface while inhibiting a bonding of the elastomer to an elastomeric -void section of the outer member inner circumference bonding surface inorder to define an elastomeric void.
  • the method includes deforming the nonelastomeric outer ductile member in towards the nonelastomeric inner member wherein the elastomeric void section of the nonelastomeric outer ductile member contacts the elastomer.
  • the invention includes a method of making a bushing.
  • the method includes providing a nonelastomeric outer member having an inner circumference bonding surface and a center bore.
  • the outer member center bore contains an elastomer and a Attorney Docket: IR-3464 (MVE)
  • the method includes deforming the nonelastomeric outer member in towards the nonelastomeric inner member wherein the elastomeric void is reduced and the nonelastomeric outer member is brought into contact with the elastomer with the elastomer between the inner member and the outer member.
  • the invention includes a vehicle hood multiple radial spring rate pivot bushing.
  • the bushing includes a nonelastomeric inner member having an inner member outer circumference bonding surface and an inner member bore with an inner member center bore axis, the inner member center bore axis offset from an outer circumference center axis of the inner member outer circumference bonding surface.
  • the invention includes an elastomer bonded to the inner member outer circumference bonding surface, and a ductile nonelastomeric outer member having an inner circumference bonding surface and an outer member center bore with an outer member center bore axis, the outer member center bore axis centered with an inner circumference center axis of the outer member inner circumference bonding surface.
  • the ductile nonelastomeric outer member inner circumference bonding surface has an elastomeric void section.
  • the ductile nonelastomeric outer member contains the elastomer and the inner member with the elastomer bonded to the outer member inner circumference bonding surface except at the elastomeric void section, the ductile nonelastomeric outer member having a deformed reduced diameter wherein the ductile nonelastomeric outer member elastomeric void section contacts the elastomer.
  • the invention includes a bushing preform.
  • the bushing preform includes a nonelastomeric inner member having an inner member outer circumference bonding surface and an inner member bore with an inner member center bore axis, the inner member center bore axis offset from an outer circumference center axis of the inner member outer circumference bonding surface.
  • the bushing preform includes an elastomer bonded to the inner member outer circumference bonding surface.
  • the bushing Attorney Docket: IR-3464 (MVE)
  • preform includes a ductile nonelastomeric outer member having ajti inner circumference bonding surface and an outer member center bore with an outer member center bore axis, the outer member center bore axis centered with an inner circumference center axis of the outer member inner circumference bonding surface.
  • the ductile rLonelastomeric outer member contains the elastomer and the inner member with the elastomer bonded to the outer member inner circumference bonding surface, the contained elastomer defining an elastomeric void between the inner member and the outer membeir, wherein the elastomeric void is removed by deforming the ductile nonelastonxeric outer member of the bushing preform to a reduced bushing diameter to provide a multiple spring rate bushing.
  • FIG. 1 shows a method of making a bushing with a mold.
  • FIG. 2 illustrates a bushing preform and a method of making a bi ⁇ shing.
  • FIG. 3 illustrates bushing performs, bushings, and methods of making bushings.
  • FIG. 4 illustrates a method of making a bushing.
  • FIG. 5 illustrates a bushing
  • FIG. 6 illustrates an installed bushing
  • FIG. 7 illustrates an installed bushing.
  • the invention provides a method of making a multiple radial spring rate pivot bushing.
  • the method includes providing a nonelastomeric inner member having an outer circumference cylindrical shell bonding surface and a bore with a center bore axis, the center bore axis offset from a center axis of the inner member outer circumference.
  • the method includes providing a nonelastomeric nonresilent outer ductile member having an inner circumference cylindrical shell bonding surface and a center bore with a center bore axis, the center bore axis centered with a center axis of "the outer member inner circumference.
  • the method includes providing an elastomer, and providing a bushing mold for receiving the nonelastomeric inner member and the nonelastomeric outer member with the nonelastomeric inner member held in the nonelastomeric outer member axial bore, and molding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer, with the elastomer bonding to the inner member outer circumference bonding surface while inhibiting a bonding of the elastomer to an elastomeric void section of the outer member inner circumference bonding surface inorder to form and define an elastomeric void.
  • the method includes deforming the nonelastomeric outer ductile member in towards the nonelastomeric inner member wherein tfcie elastomeric void section of the nonelastomeric outer ductile member contacts the elastomer, preferably with the nonelastomeric inner member center bore axis centered with the monelastomeric outer ductile member center bore axis. Preferably the offcentered inner member bore becomes centered with the outer member.
  • IR-3464 MVE
  • deforming includes contacting the elastomer with the elastomeric void section of the outer member while inhibiting substantial compression of the elastomer by the elastomeric void section of the outer member, hi an embodiment deforming and contacting includes compressing the elastomer between the elastomeric void section of outer member and the inner member outer bonding surface.
  • FIGS illustrate methods of making multiple radial spring rate pivot bushings.
  • the method includes providing a nonelastomeric inner member 20 having an outer circumference cylindrical shell bonding surface 21 and a bore 22 with a center bore axis 23, the center bore axis preferably offset from the center axis of the inner member outer circumference 21.
  • the method includes providing a nonelastomeric nonresilent outer ductile member 30 having an inner circumference cylindrical shell bonding surface 31 and a center bore 32 with a center bore axis 33, the center bore axis centered with the center axis of the outer member inner circumference 31.
  • the method includes providing an elastomer 40, and providing a bushing mold 50 for receiving the nonelastomeric inner member 20 and the nonelastomeric outer member 30 with the nonelastomeric inner member held in the nonelastomeric outer member axial bore 32, and molding the nonelastomeric inner member 20 to the nonelastomeric outer member 30 with the elastomer 40, with the elastomer bonding to the inner member outer circumference bonding surface 21 while inhibiting a bonding of the elastomer to an elastomeric void section 35 of the outer member inner circumference bonding surface 31 inorder to form and define an elastomeric void 36, such as with mold 50 extending into and occupying the elastomeric void space 36. As shown in FIG.
  • the method includes deforming the nonelastomeric outer ductile member 30 in towards the nonelastomeric inner member 20 wherein the elastomeric void section 35 of the nonelastomeric outer ductile member contacts the elastomer 40, preferably with the nonelastomeric inner member center bore axis centered with the nonelastomeric outer ductile member center bore axis.
  • the bushing performs as bonded with the elastomer to the inner member 20 and the outer member 30, are deformed by swaging to deform the outer member 30 radially inward towards the inner member 20.
  • the performs are s wagged so that the elastomer 40 adjacent the elastomeric Attorney Docket: IR-3464 (MVE)
  • void space 36 touches the outer member inside circumference at the elastomeric void section 35, preferably while inhibiting compression of that elastomer by the outer member inside circumference at the elastomeric void section 35
  • the offcentered inner member bore becomes centered with the outer member.
  • deforming includes contact of the elastomer 40 by the elastomeric void section 35 of the outer member while inhibiting substantial compression of the elastomer by the elastomeric void section 35 of tfcie outer member.
  • deforming and contacting includes compressing the elastomer 40 between the elastomeric void section 35 of the outer member and the inner member outer bonding surface.
  • molding the nonelastomeric- inner member 20 to the nonelastomeric outer member 30 with the elastomer 4O 9 preferably includes inhibiting bonding of the elastomer 40 to a first elastomeric void section 35 and to a second elastomeric void section 35 such as shown in the lower lialf of FIG.
  • the second elastomeric void section 35 is separate and distal from the first elastomeric void section 35, preferably with the second section 35 oriented in opposition to the first section 35.
  • each elastomeric void section 35 is about twenty five percent of the outer member inner circumference bonding surface 31.
  • molding the nonelastomeric inner member 20 to the nonelastomeric outer member 30 with the elastomer 40 includes inhibiting bonding of ttxe elastomer 40 to an elastomeric void section 35 comprising at least twenty five percent of the outer member inner circumference bonding surface.
  • Preferably molding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer includes inhibiting bonding of the elastomer from twenty five to seventy five percent of thie outer member inner circumference bonding surface 31, more preferably about fifty percent (50 ⁇ 10%).
  • the void section 35 is about fifty percent of the outer member inner circumference bonding surface 31, and with two elastomeric voids, each void section is about twenty five percent, hi an embodiment deforming the nonelastomeric outer ductile member in towards the no-nelastomeric inner member includes compressing the elastomer 40 between the inner member outer surface 21 and the elastomeric void section 35 of the nonelastomeric outer ductile member inner Attorney Docket: IR-3464 (MVE)
  • compressing the elastomer 40 between the inner member outer surface 21 and the elastomeric void section 35 of the nonelastomeric outer ductile member inner surface includes compressing the elastomer with a compression strain in the range of one to fifty percent, more preferably with a compression strain in the range of fifteen to twenty percent.
  • the invention includes a method of making a multiple radial spring rate pivot bushing.
  • the method includes providing a nonelastomeric inner member 20 having an outer circumference cylindrical shell bonding surface 21 and a bore 22 with a center bore axis 23, with the center bore axis 23 offset from the center axis of the inner member outer circumference 21.
  • the method includes providing a nonelastomeric outer ductile member 30 having an inner circumference cylindrical shell bonding surface 31 having a center bore 32 and a center bore axis 33 preferably centered with the center axis of the outer member inner circumference 31.
  • the method includes providing an elastomer 40 and bonding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer 40 bonding to the inner member outer circumference bonding surface 21 while inhibiting a bonding of the elastomer 40 to an elastomeric void section 35 of the outer member inner circumference 31 inorder to define an elastomeric void 36.
  • the method includes deforming the nonelastomeric outer ductile member 30 in towards the nonelastomeric inner member 20 wherein trxe elastomeric void section 35 of the nonelastomeric outer ductile member contacts the elastomer 40 and the nonelastomeric inner member center bore axis 23 is preferably centered with the nonelastomeric outer ductile member center bore axis 33, preferably with the offcentered inner member bore becoming centered.
  • just contact is made between the elastomer and the elastomeric void section of the outer member and not compression of elastomer by elastomeric void section of the outer member.
  • contacting includes compressing the elastomer 40 between the elastomeric void section 35 of outer member and inner member outer bonding surface 21.
  • molding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer includes inhibiting the bonding of the elastomer 40 to a first elastomeric void section 35 Attorney Docket: IR-3464 (MVE)
  • each section is about twenty five percent of the outer member inner circumference bonding surface.
  • molding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer includes inhibiting bonding of the elastomer to an elastomeric void section comprising at least twenty five percent of the outer member inner circumference bonding surface.
  • Preferably molding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer includes inhibiting bonding of the elastomer from twenty five to seventy five percent of the outer member inner circumference bonding surface , more preferably about fifty percent (50 ⁇ 10%).
  • the elastomeric void section is about fifty percent of the outer member inner circumference.
  • each void section is about twenty five percent of the outer member inner circumference.
  • deforming the nonelastomeric outer ductile member in towards the nonelastomeric inner member includes compressing the elastomer between the inner member outer surface and the elastomeric void section of the nonelastomeric outer ductile member inner surface.
  • compressing the elastomer between the inner member outer surface and the elastomeric void section of the nonelastomeric outer ductile member inner surface includes compressing the elastomer with a compression strain in the range of one to fifty percent, more preferably with a compression strain in the range of fifteen to twenty percent.
  • the invention includes a method of making a multiple radial spring rate pivot bushing.
  • the method includes providing a nonelastomeric outer ductile member 30 having an inner circumference , an inner circumference cylindrical shell bonding surface and a center bore with a center bore axis.
  • the center bore center bore axis is centered with the center axis of the outer member inner circumference.
  • the outer member center bore 32 contains an elastomer 40 and a. nonelastomeric inner member 20 having an outer circumference cylindrical shell bonding surface and a bore with a center bore axis.
  • the inner member center bore axis is offset from the center axis of the inner member outer circumference.
  • the elastomer 40 is bonded to the inner member outer circumference bonding surface and to the outer member inner bonding surface with an elastomeric void 36 defined by the elastomer 40 between the inner member and the outer member.
  • the method includes deforming the nonelastomeric outer ductile member 30 radially in towards the nonelastomeric inner member 20 wherein the elastomeric void space 36 is reduced and the nonelastomeric outer ductile member 30 is brought into contact with the elastomer 40 between the inner member 20 and the outer member 30.
  • the nonelastomeric inner member 20 center bore axis is centered with the nonelastomeric outer ductile member 30 center bore axis, preferably with the offcentered inner member bore becoming centered by the deforming of the outer ductile member 30.
  • deforming includes contacting of the elastomer 40 by the elastomeric void section 35 of the outer member while inhibiting substantial compression of the elastomer 40 by the elastomeric void section 35 of the outer member.
  • deforming and contacting includes compressing the elastomer 40 between the elastomeric void section 35 of outer member and the inner member outer bonding surface 21.
  • the elastomer 40 defines a first elastomeric void 36 and a second elastomeric void 36 , with the second elastomeric void section separate and distal from the first elastomeric void section.
  • the second elastomeric void section 35 is oriented in opposition to the first elastomeric void section 35, most preferably with each section about twenty five percent (25% ⁇ 5%) of the outer member inner circumference bonding surface.
  • the elastomeric void 36 includes an elastomeric void section 35 comprising at least twenty five percent of the outer member 30 inner circumference surface.
  • the elastomeric void 36 includes an elastomeric void section 35 comprising from twenty five to seventy five percent of the outer member inner circumference bonding surface, more preferably about fifty percent (50% ⁇ 10%), preferably with only one void the void section is about fifty percent (50% ⁇ 10%), and with two voids, each void section is about twenty five percent (25% ⁇ 5%).
  • deforming the nonelastomeric outer ductile member 30 in towards the nonelastomeric inner member 20 includes compressing the elastomer 40 between the inner member outer surface and the nonelastomeric outer ductile member inner surface.
  • compressing the elastomer 40 between the inner member outer surface 21 and the nonelastomeric outer ductile member inner surface 31 includes compressing the elastomer 40 with a compression strain in the range of one to fifty percent, more preferably a compression strain in the range of fifteen to twenty percent.
  • the invention includes a multiple radial spring rate pivot bushing.
  • the bushing includes nonelastomeric inner member 20 having an outer circumference cylindrical shell bonding surface 21 and a bore 22 with a center bore axis 23, preferably with the center bore axis 23 offset from a center axis of the inner member outer circumference 21.
  • the bushing includes elastomer 40 bonded, to the inner member outer circumference bonding surface 21, and ductile nonelastomeric nonresilent outer member 30 having an inner circumference cylindrical shell bonding surface 31 and center bore 32 with a center bore axis 33, preferably with the center bore axis centered with a center axis of the outer member inner circumference.
  • the ductile nonelastomeric outer member inner circumference cylindrical shell bonding surface 31 has elastomeric void section 35, with the ductile nonelastomeric outer member 30 containing the elastomer 40 and the inner member 20 with the elastomer 40 bonded to the outer member inner circumference cylindrical shell bonding surface 31 except at the elastomeric void section 35.
  • the ductile nonelastomeric outer member 30 has a deformed radially inward reduced diameter wherein the elastomeric void section 35 of the nonelastomeric outer ductile member 30 contacts the elastomer 40 and preferably the nonelastomeric inner member center bore axis 23 is centered with the nonelastomeric outer ductile member center bore axis 33.
  • elastomer 40 there is just contact and not compression of the elastomer 40 by the elastomeric void section 35 of outer member. In an embodiment the elastomer 40 is compressed between the elastomeric void section 35 of outer member and inner member outer bonding surface 21.
  • the invention includes a multiple radial spring rate pivot bushing preform.
  • the bushing perform includes the nonelastomeric inner member 20 having an outer Attorney Docket: IR-3464 (MVE)
  • the bushing perform includes elastomer 40 bonded to the inner member outer circumference bonding surface 21, and the ductile nonelastomeric nonresilent outer member 30 having the inner circumference cylindrical shell bonding surface 31 and center bore 32 with center bore axis 33.
  • Preferably tlie center bore axis 33 is centered with a center axis of the outer member inner circumference 31.
  • the ductile nonelastomeric outer member contains the elastomer 40 and the inner member 20 "with elastomer 40 bonded to the outer member inner circumference cylindrical shell bonding surface 31.
  • the contained elastomer 40 defines an elastomeric void 36 between the inner member 20 and the outer member 30, wiierein the elastomeric void 36 is removed by radially inwardly deforming the ductile nonelastomeric outer member 30 of the preform to a reduced diameter to provide a multiple radial spring rate pivot bushing, preferably with the nonelastomeric innerr member center bore axis 23 centered with the nonelastomeric outer ductile member center bore axis 33.
  • the offcentered inner member bore 22 of the preform becomes centered in the resulting bushing.
  • the invention provides a vehicle hood pivot bushing that incorporates multiple radial spring rates that are dependent upon the bushing orientation.
  • the invention- provides a hood pivot bushing that has two distinct radial and axial spring rates.
  • the invention provides various radial spring rates that allow varying degrees of deflection that are dependent upon bushing orientation.
  • the invention provides a vehicle hood bxishing that provides compliance that accommodates vehicle frame articulation resulting rfrom road inputs during vehicle use.
  • the bushing preferably incorporates a ductile nonelastomeric cylindrical outer member 30 (O. M. [Outer Member], preferably a cylindrical ductile steel outer member) and a nonelastomeric inner member 20 (LM.
  • the elastomer 40 is bonded to a portion of the O.M.'s inside surface (preferably about half of the O.M.'s inside surface) and relatively all of the LM. ' s outside surface.
  • the opposite elastomer section (oppositely orientated relative to the Attorney Docket: IR-3464 (MVE)
  • elastomer bonded to the portion of the O.M.'s inside surface has a cored area elastomeric void 36 between th.e elastomer itself and the O.M.'s inside surface.
  • the cored, area elastomeric void 36 closes up thereby causing the elastomer 40 to contact the O.1M. LD. [Inside Diameter].

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Springs (AREA)

Abstract

A vehicle hood pivot bushing and methods of making a hood pivot bushings with multiple spring rates. The method of making the multiple radial spring rate pivot bushing includes providing a nonelastomeric inner member (20) having an outer circumference bonding surface (21) and a bore (22) with a center bore axis. The method includes providing a elastomer (40) and a bushing mold for receiving the nonelastomeric inner member (20) and the nonelastomeric outer member (30) with the nonelastomeric inner member held in the nonelastomeric outer member axial bore, and molding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer, with the elastomer bonding to the inner member outer circumference bonding surface while inhibiting a bonding of the elastomer to an elastomeric void section (35) of the outer member inner circumference bonding surface. The method includes deforming the nonelastomeric outer ductile member in towards the nonelastomeric inner member wherein the elastomeric void section of the nonelastomeric outer ductile member contacts the elastomer.

Description

MULTIPLE RADIAL SPRING RATE PIVOT BUSHING AND METHOD OF MAKING
Cross Reference
This application claims the benefit of, and incorporates by reference, United States Provisional Patent Application Number 60/621,175 filed on October 22, 2004.
Field of the Invention
The present invention relates to hood pivot bushings and methods of making hood pivot bushings with multiple spring rates. More particularly the invention relates to vehicle hood pivot bushings and methods of making vehicular hood pivot bushings with multiple radial spring rates.
Background of the Invention
There is a need for an economical method of making hood pivot bushings with multiple spring rates. There is a need for a pivot bushing with multiple radial spring rates. There is a need for an economically feasible method of making pivot bushings with multiple spring rates.
SUMMARY OF THE INVENTION
The invention includes a method of making a multiple radial spring rate pivot bushing. The method includes providing a nonelastomeric inner member having an outer circumference bonding surface and a bore with a center bore axis, preferably with the center bore axis offset from a center axis of the inner member outer circumference. The method includes providing a nonelastomeric outer ductile member having an inner Attorney Docket: IR-3464 (MVE)
circumference bonding surface and a center bore with a center bore axis, with the center bore axis preferably centered with a center axis of the outer member inner circumference. The method includes providing an elastomer. The method includes providing a bushing mold for receiving the nonelastomeric inner member and the nonelastomeric outer member with the nonelastomeric inner member held in the nonelastomeric outer member axial bore. The method includes molding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer, with the elastomer "bonding to the inner member outer circumference bonding surface while inhibiting a bonding of the elastomer to an elastomeric void section of the outer member inner circumference bonding surface. The method includes deforming the nonelastomeric outer ductile member in towards the nonelastomeric inner member wherein the elastomeric void section of the nonelastomeric outer ductile member contacts the elastomer.
The invention includes a method of making a pivot bushing. The method includes providing a nonelastomeric inner member having an outer circumference bonding surface. The method includes providing a nonelastomeric outer member having an inner circumference bonding surface. The method includes providing an elastomer. The method includes bonding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer bonding to the inner member outer circumference bonding surface while inhibiting a bonding of the elastomer to an elastomeric -void section of the outer member inner circumference bonding surface inorder to define an elastomeric void. The method includes deforming the nonelastomeric outer ductile member in towards the nonelastomeric inner member wherein the elastomeric void section of the nonelastomeric outer ductile member contacts the elastomer.
The invention includes a method of making a bushing. The method includes providing a nonelastomeric outer member having an inner circumference bonding surface and a center bore. Preferably the outer member center bore contains an elastomer and a Attorney Docket: IR-3464 (MVE)
nonelastomeric inner member having an outer circumference bonding surface with the elastomer bonded to the inner member outer circumference bonding surface and to the outer member inner bonding surface with an elastomeric void defined by the elastomer between the inner member and the outer member. The method includes deforming the nonelastomeric outer member in towards the nonelastomeric inner member wherein the elastomeric void is reduced and the nonelastomeric outer member is brought into contact with the elastomer with the elastomer between the inner member and the outer member.
The invention includes a vehicle hood multiple radial spring rate pivot bushing. The bushing includes a nonelastomeric inner member having an inner member outer circumference bonding surface and an inner member bore with an inner member center bore axis, the inner member center bore axis offset from an outer circumference center axis of the inner member outer circumference bonding surface. The invention includes an elastomer bonded to the inner member outer circumference bonding surface, and a ductile nonelastomeric outer member having an inner circumference bonding surface and an outer member center bore with an outer member center bore axis, the outer member center bore axis centered with an inner circumference center axis of the outer member inner circumference bonding surface. The ductile nonelastomeric outer member inner circumference bonding surface has an elastomeric void section. The ductile nonelastomeric outer member contains the elastomer and the inner member with the elastomer bonded to the outer member inner circumference bonding surface except at the elastomeric void section, the ductile nonelastomeric outer member having a deformed reduced diameter wherein the ductile nonelastomeric outer member elastomeric void section contacts the elastomer.
The invention includes a bushing preform. The bushing preform includes a nonelastomeric inner member having an inner member outer circumference bonding surface and an inner member bore with an inner member center bore axis, the inner member center bore axis offset from an outer circumference center axis of the inner member outer circumference bonding surface. The bushing preform includes an elastomer bonded to the inner member outer circumference bonding surface. The bushing Attorney Docket: IR-3464 (MVE)
preform includes a ductile nonelastomeric outer member having ajti inner circumference bonding surface and an outer member center bore with an outer member center bore axis, the outer member center bore axis centered with an inner circumference center axis of the outer member inner circumference bonding surface. The ductile rLonelastomeric outer member contains the elastomer and the inner member with the elastomer bonded to the outer member inner circumference bonding surface, the contained elastomer defining an elastomeric void between the inner member and the outer membeir, wherein the elastomeric void is removed by deforming the ductile nonelastonxeric outer member of the bushing preform to a reduced bushing diameter to provide a multiple spring rate bushing.
It is to be understood that both the foregoing general description and the following detailed description are exemplary of the invention, and are intended to provide an overview or framework for understanding the nature and character of the invention as it is claimed. The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate various embodiments of the invention, and together with the description serve to explain the principals and operation of the invention.
Brief Description of the Drawings
FIG. 1 shows a method of making a bushing with a mold.
FIG. 2 illustrates a bushing preform and a method of making a biαshing.
FIG. 3 illustrates bushing performs, bushings, and methods of making bushings.
FIG. 4 illustrates a method of making a bushing.
FIG. 5 illustrates a bushing.
FIG. 6 illustrates an installed bushing.
FIG. 7 illustrates an installed bushing. Attorney Docket: IR-3464 (MVE)
Detailed Description of the Preferred Embodiments
Additional features and advantages of the invention will be set forth in the detailed description which follows, and in part will be readily apparent to those skilled in the art from that description or recognized by practicing the invention as described herein, including the detailed description which follows, the claims, as well as the appended drawings.
Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.
The invention provides a method of making a multiple radial spring rate pivot bushing. The method includes providing a nonelastomeric inner member having an outer circumference cylindrical shell bonding surface and a bore with a center bore axis, the center bore axis offset from a center axis of the inner member outer circumference. The method includes providing a nonelastomeric nonresilent outer ductile member having an inner circumference cylindrical shell bonding surface and a center bore with a center bore axis, the center bore axis centered with a center axis of "the outer member inner circumference. The method includes providing an elastomer, and providing a bushing mold for receiving the nonelastomeric inner member and the nonelastomeric outer member with the nonelastomeric inner member held in the nonelastomeric outer member axial bore, and molding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer, with the elastomer bonding to the inner member outer circumference bonding surface while inhibiting a bonding of the elastomer to an elastomeric void section of the outer member inner circumference bonding surface inorder to form and define an elastomeric void. The method includes deforming the nonelastomeric outer ductile member in towards the nonelastomeric inner member wherein tfcie elastomeric void section of the nonelastomeric outer ductile member contacts the elastomer, preferably with the nonelastomeric inner member center bore axis centered with the monelastomeric outer ductile member center bore axis. Preferably the offcentered inner member bore becomes centered with the outer member. In an embodiment Attorney Docket: IR-3464 (MVE)
deforming includes contacting the elastomer with the elastomeric void section of the outer member while inhibiting substantial compression of the elastomer by the elastomeric void section of the outer member, hi an embodiment deforming and contacting includes compressing the elastomer between the elastomeric void section of outer member and the inner member outer bonding surface.
The FIGS, illustrate methods of making multiple radial spring rate pivot bushings. As shown in FIG. 1 the method includes providing a nonelastomeric inner member 20 having an outer circumference cylindrical shell bonding surface 21 and a bore 22 with a center bore axis 23, the center bore axis preferably offset from the center axis of the inner member outer circumference 21. The method includes providing a nonelastomeric nonresilent outer ductile member 30 having an inner circumference cylindrical shell bonding surface 31 and a center bore 32 with a center bore axis 33, the center bore axis centered with the center axis of the outer member inner circumference 31. The method includes providing an elastomer 40, and providing a bushing mold 50 for receiving the nonelastomeric inner member 20 and the nonelastomeric outer member 30 with the nonelastomeric inner member held in the nonelastomeric outer member axial bore 32, and molding the nonelastomeric inner member 20 to the nonelastomeric outer member 30 with the elastomer 40, with the elastomer bonding to the inner member outer circumference bonding surface 21 while inhibiting a bonding of the elastomer to an elastomeric void section 35 of the outer member inner circumference bonding surface 31 inorder to form and define an elastomeric void 36, such as with mold 50 extending into and occupying the elastomeric void space 36. As shown in FIG. 4 the method includes deforming the nonelastomeric outer ductile member 30 in towards the nonelastomeric inner member 20 wherein the elastomeric void section 35 of the nonelastomeric outer ductile member contacts the elastomer 40, preferably with the nonelastomeric inner member center bore axis centered with the nonelastomeric outer ductile member center bore axis. As shown in FIG 3-4, preferably the bushing performs as bonded with the elastomer to the inner member 20 and the outer member 30, are deformed by swaging to deform the outer member 30 radially inward towards the inner member 20. In preferred embodiments the performs are s wagged so that the elastomer 40 adjacent the elastomeric Attorney Docket: IR-3464 (MVE)
void space 36 touches the outer member inside circumference at the elastomeric void section 35, preferably while inhibiting compression of that elastomer by the outer member inside circumference at the elastomeric void section 35 Preferably the offcentered inner member bore becomes centered with the outer member.
In an embodiment deforming includes contact of the elastomer 40 by the elastomeric void section 35 of the outer member while inhibiting substantial compression of the elastomer by the elastomeric void section 35 of tfcie outer member. In an embodiment deforming and contacting includes compressing the elastomer 40 between the elastomeric void section 35 of the outer member and the inner member outer bonding surface. In an embodiment, molding the nonelastomeric- inner member 20 to the nonelastomeric outer member 30 with the elastomer 4O9 preferably includes inhibiting bonding of the elastomer 40 to a first elastomeric void section 35 and to a second elastomeric void section 35 such as shown in the lower lialf of FIG. 3. Preferably the second elastomeric void section 35 is separate and distal from the first elastomeric void section 35, preferably with the second section 35 oriented in opposition to the first section 35. In a preferred embodiment each elastomeric void section 35 is about twenty five percent of the outer member inner circumference bonding surface 31. Preferably molding the nonelastomeric inner member 20 to the nonelastomeric outer member 30 with the elastomer 40, includes inhibiting bonding of ttxe elastomer 40 to an elastomeric void section 35 comprising at least twenty five percent of the outer member inner circumference bonding surface. Preferably molding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer, includes inhibiting bonding of the elastomer from twenty five to seventy five percent of thie outer member inner circumference bonding surface 31, more preferably about fifty percent (50±10%). Preferably with one elastomeric void, the void section 35 is about fifty percent of the outer member inner circumference bonding surface 31, and with two elastomeric voids, each void section is about twenty five percent, hi an embodiment deforming the nonelastomeric outer ductile member in towards the no-nelastomeric inner member includes compressing the elastomer 40 between the inner member outer surface 21 and the elastomeric void section 35 of the nonelastomeric outer ductile member inner Attorney Docket: IR-3464 (MVE)
surface. Preferably compressing the elastomer 40 between the inner member outer surface 21 and the elastomeric void section 35 of the nonelastomeric outer ductile member inner surface, includes compressing the elastomer with a compression strain in the range of one to fifty percent, more preferably with a compression strain in the range of fifteen to twenty percent.
The invention includes a method of making a multiple radial spring rate pivot bushing. The method includes providing a nonelastomeric inner member 20 having an outer circumference cylindrical shell bonding surface 21 and a bore 22 with a center bore axis 23, with the center bore axis 23 offset from the center axis of the inner member outer circumference 21. The method includes providing a nonelastomeric outer ductile member 30 having an inner circumference cylindrical shell bonding surface 31 having a center bore 32 and a center bore axis 33 preferably centered with the center axis of the outer member inner circumference 31. The method includes providing an elastomer 40 and bonding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer 40 bonding to the inner member outer circumference bonding surface 21 while inhibiting a bonding of the elastomer 40 to an elastomeric void section 35 of the outer member inner circumference 31 inorder to define an elastomeric void 36. The method includes deforming the nonelastomeric outer ductile member 30 in towards the nonelastomeric inner member 20 wherein trxe elastomeric void section 35 of the nonelastomeric outer ductile member contacts the elastomer 40 and the nonelastomeric inner member center bore axis 23 is preferably centered with the nonelastomeric outer ductile member center bore axis 33, preferably with the offcentered inner member bore becoming centered. Preferably in an embodiment just contact is made between the elastomer and the elastomeric void section of the outer member and not compression of elastomer by elastomeric void section of the outer member. Preferably in an embodiment contacting includes compressing the elastomer 40 between the elastomeric void section 35 of outer member and inner member outer bonding surface 21. Preferably molding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer, includes inhibiting the bonding of the elastomer 40 to a first elastomeric void section 35 Attorney Docket: IR-3464 (MVE)
and to a second elastomeric void section 35, preferably with the second elastomeric void section 35 separate and distal from the first ela-stomeric void section 35. Preferably the second elastomeric void section 35 is oriented in opposition to the first elastomeric void section 35. Preferably with two elastomeric void sections, each section is about twenty five percent of the outer member inner circumference bonding surface. Preferably molding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer, includes inhibiting bonding of the elastomer to an elastomeric void section comprising at least twenty five percent of the outer member inner circumference bonding surface. Preferably molding the nonelastomeric inner member to the nonelastomeric outer member with the elastomer, includes inhibiting bonding of the elastomer from twenty five to seventy five percent of the outer member inner circumference bonding surface , more preferably about fifty percent (50±10%). Preferably with one elastomeric void, the elastomeric void section is about fifty percent of the outer member inner circumference. Preferably with two elastomeric voids, each void section is about twenty five percent of the outer member inner circumference. Preferably deforming the nonelastomeric outer ductile member in towards the nonelastomeric inner member includes compressing the elastomer between the inner member outer surface and the elastomeric void section of the nonelastomeric outer ductile member inner surface. Preferably compressing the elastomer between the inner member outer surface and the elastomeric void section of the nonelastomeric outer ductile member inner surface, includes compressing the elastomer with a compression strain in the range of one to fifty percent, more preferably with a compression strain in the range of fifteen to twenty percent.
The invention includes a method of making a multiple radial spring rate pivot bushing. The method includes providing a nonelastomeric outer ductile member 30 having an inner circumference , an inner circumference cylindrical shell bonding surface and a center bore with a center bore axis. Preferably the center bore center bore axis is centered with the center axis of the outer member inner circumference. The outer member center bore 32 contains an elastomer 40 and a. nonelastomeric inner member 20 having an outer circumference cylindrical shell bonding surface and a bore with a center bore axis. Attorney Docket: IR-3464 (MVE)
Preferably the inner member center bore axis is offset from the center axis of the inner member outer circumference. The elastomer 40 is bonded to the inner member outer circumference bonding surface and to the outer member inner bonding surface with an elastomeric void 36 defined by the elastomer 40 between the inner member and the outer member. The method includes deforming the nonelastomeric outer ductile member 30 radially in towards the nonelastomeric inner member 20 wherein the elastomeric void space 36 is reduced and the nonelastomeric outer ductile member 30 is brought into contact with the elastomer 40 between the inner member 20 and the outer member 30. Preferably the nonelastomeric inner member 20 center bore axis is centered with the nonelastomeric outer ductile member 30 center bore axis, preferably with the offcentered inner member bore becoming centered by the deforming of the outer ductile member 30. In an embodiment deforming includes contacting of the elastomer 40 by the elastomeric void section 35 of the outer member while inhibiting substantial compression of the elastomer 40 by the elastomeric void section 35 of the outer member. In an embodiment deforming and contacting includes compressing the elastomer 40 between the elastomeric void section 35 of outer member and the inner member outer bonding surface 21. Preferably the elastomer 40 defines a first elastomeric void 36 and a second elastomeric void 36 , with the second elastomeric void section separate and distal from the first elastomeric void section. Preferably the second elastomeric void section 35 is oriented in opposition to the first elastomeric void section 35, most preferably with each section about twenty five percent (25%±5%) of the outer member inner circumference bonding surface. Preferably the elastomeric void 36 includes an elastomeric void section 35 comprising at least twenty five percent of the outer member 30 inner circumference surface. Preferably the elastomeric void 36 includes an elastomeric void section 35 comprising from twenty five to seventy five percent of the outer member inner circumference bonding surface, more preferably about fifty percent (50%±10%), preferably with only one void the void section is about fifty percent (50%±10%), and with two voids, each void section is about twenty five percent (25%±5%). Preferably deforming the nonelastomeric outer ductile member 30 in towards the nonelastomeric inner member 20 includes compressing the elastomer 40 between the inner member outer surface and the nonelastomeric outer ductile member inner surface. Preferably Attorney Docket: IR-3464 (MVE)
compressing the elastomer 40 between the inner member outer surface 21 and the nonelastomeric outer ductile member inner surface 31, includes compressing the elastomer 40 with a compression strain in the range of one to fifty percent, more preferably a compression strain in the range of fifteen to twenty percent.
The invention includes a multiple radial spring rate pivot bushing. The bushing includes nonelastomeric inner member 20 having an outer circumference cylindrical shell bonding surface 21 and a bore 22 with a center bore axis 23, preferably with the center bore axis 23 offset from a center axis of the inner member outer circumference 21. The bushing includes elastomer 40 bonded, to the inner member outer circumference bonding surface 21, and ductile nonelastomeric nonresilent outer member 30 having an inner circumference cylindrical shell bonding surface 31 and center bore 32 with a center bore axis 33, preferably with the center bore axis centered with a center axis of the outer member inner circumference. The ductile nonelastomeric outer member inner circumference cylindrical shell bonding surface 31 has elastomeric void section 35, with the ductile nonelastomeric outer member 30 containing the elastomer 40 and the inner member 20 with the elastomer 40 bonded to the outer member inner circumference cylindrical shell bonding surface 31 except at the elastomeric void section 35. The ductile nonelastomeric outer member 30 has a deformed radially inward reduced diameter wherein the elastomeric void section 35 of the nonelastomeric outer ductile member 30 contacts the elastomer 40 and preferably the nonelastomeric inner member center bore axis 23 is centered with the nonelastomeric outer ductile member center bore axis 33. In an embodiment there is just contact and not compression of the elastomer 40 by the elastomeric void section 35 of outer member. In an embodiment the elastomer 40 is compressed between the elastomeric void section 35 of outer member and inner member outer bonding surface 21.
The invention includes a multiple radial spring rate pivot bushing preform. The bushing perform includes the nonelastomeric inner member 20 having an outer Attorney Docket: IR-3464 (MVE)
circumference cylindrical shell bonding surface 21 and bore 22 with a center bor& axis 23, with the center bore axis 23 offset from a center axis of the inner member outer circumference cylindrical shell surface 21. The bushing perform includes elastomer 40 bonded to the inner member outer circumference bonding surface 21, and the ductile nonelastomeric nonresilent outer member 30 having the inner circumference cylindrical shell bonding surface 31 and center bore 32 with center bore axis 33. Preferably tlie center bore axis 33 is centered with a center axis of the outer member inner circumference 31. The ductile nonelastomeric outer member contains the elastomer 40 and the inner member 20 "with elastomer 40 bonded to the outer member inner circumference cylindrical shell bonding surface 31. The contained elastomer 40 defines an elastomeric void 36 between the inner member 20 and the outer member 30, wiierein the elastomeric void 36 is removed by radially inwardly deforming the ductile nonelastomeric outer member 30 of the preform to a reduced diameter to provide a multiple radial spring rate pivot bushing, preferably with the nonelastomeric innerr member center bore axis 23 centered with the nonelastomeric outer ductile member center bore axis 33. Preferably the offcentered inner member bore 22 of the preform becomes centered in the resulting bushing.
The invention provides a vehicle hood pivot bushing that incorporates multiple radial spring rates that are dependent upon the bushing orientation. The invention- provides a hood pivot bushing that has two distinct radial and axial spring rates. The invention provides various radial spring rates that allow varying degrees of deflection that are dependent upon bushing orientation. The invention provides a vehicle hood bxishing that provides compliance that accommodates vehicle frame articulation resulting rfrom road inputs during vehicle use. The bushing preferably incorporates a ductile nonelastomeric cylindrical outer member 30 (O. M. [Outer Member], preferably a cylindrical ductile steel outer member) and a nonelastomeric inner member 20 (LM. [Inner Member], preferably a brass inner member) , preferably with an off-set inside diameter bore. The elastomer 40 is bonded to a portion of the O.M.'s inside surface (preferably about half of the O.M.'s inside surface) and relatively all of the LM. ' s outside surface. The opposite elastomer section (oppositely orientated relative to the Attorney Docket: IR-3464 (MVE)
elastomer bonded to the portion of the O.M.'s inside surface) has a cored area elastomeric void 36 between th.e elastomer itself and the O.M.'s inside surface. Upon swaging (radially reducing the bushing O. D. [Outside Diameter] and deforming the ductile O.M.'s O.D. ) the cored, area elastomeric void 36closes up thereby causing the elastomer 40 to contact the O.1M. LD. [Inside Diameter]. When radially loaded in the direction of the core the elastomer compresses and the opposite elastomer section is tensioned thereby providing trie relatively stiffer spring rate; when radially loaded in trae opposite direction the formerly tensioned elastomer is compressed while the cored area elastomeric void portion disengages from the O.M. inner circumference surface providing the relatively softer spring rate.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit and scope of the invention. Thus, It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

Attorney Docket: IR-3464 (MVE)CLAIMS
1. A method of making a multiple radial spring rate pivot bushing, said method comprising: providing a nonelastomeric inner member having an outer circumference bonding surface and a bore with a center bore axis, said center bore axis offset from a center axis of said inner member outer circumference, providing a nonelastomeric outer ductile member having an inner circumference bonding surface and a center bore with a center bore axis, said center bore axis centered with a center axis of said outer member inner circumference, providing an elastomer, providing a bushing mold for receiving said nonelastomeric inner member and said nonelastomeric outer member with said nonelastomeric inner member held in said nonelastomeric outer member axial bore, molding said nonelastomeric inner member to said nonelastomeric outer member with said elastomer, with said elastomer bonding to said inner member outer circumference bonding surface while inhibiting a bonding of said elastomer to an elastomeric void section of said outer member inner circumference bonding surface, deforming said nonelastomeric outer ductile member in towards said nonelastomeric inner member wherein said elastomeric void section of said nonelastomeric outer ductile member contacts said elastomer .
2. A method as claimed in claim 1, wherein molding said nonelastomeric inner member to said nonelastomeric outer member with said elastomer, includes inhibiting bondin_g of said elastomer to a first elastomeric void section and to a second elastomeric void section.
3. A method as claimed in claim. 1 , wherein molding said nonelastomeric inner menxber to said nonelastomeric outer member with said elastomer, includes inhibiting bonding of Attorney Docket: IR-3464 (MVE)
said elastomer to an elastomeric void section comprising at least twenty five percent of said outer member inner circumference bonding surface.
4. A method as claimed in claim 1, wherein molding said nonelastomeric inner member to said nonelastomeric outer member with said elastomer, includes inhibiting bonding of said elastomer from twenty five to seventy five percent of said outer member inner circumference bonding surface.
5. A method as claimed in claim 1, wherein deforming said nonelastomeric outer ductile member in towards said nonelastomeric inner member includes compressing the elastomer between said inner member outer surface and said elastomeric void section of said nonelastomeric outer ductile member inner surface.
6. A method as claimed in claim 5, wherein compressing the elastomer between said inner member outer surface and said elastomeric void section of said nonelastomeric outer ductile member inner surface, includes compressing the elastomer with a compression strain in the range of one to fifty percent.
7. A method of making a pivot bushing, said method comprising: providing a nonelastomeric inner member having an outer circumference "bonding surface, providing a nonelastomeric outer member having an inner circumference; bonding surface, providing an elastomer, bonding said nonelastomeric inner member to said nonelastomeric outer member with said elastomer bonding to said inner member outer circumference bonding surface while inhibiting a bonding of said elastomer to an elastomeric void section of said outer member inner circumference bonding surface inorder to define an elastomeric void, deforming said nonelastomeric outer ductile member in towards said nonelastomeric inner member wherein said elastomeric void section of said nonelastomeric outer ductile member contacts said elastomer. Attorney Docket: ER-3464 (MVE)
8. A method as claimed in claim 7, wherein molding said nonelastomeric inner member to said nonelastomeric outer member with said elastomer, includes inhibiting bonding of said elastomer to a first elastomeric void section and to a second elastomeric void section.
9. A method as claimed in claim 7, wherein molding said nonelastomeric inner member to said nonelastomeric outer member with said elastomer, includes inhibiting bonding of said elastomer to an elastomeric void section comprising at least twenty five percent of said outer member inner circumference bonding surface.
10. A method as claimed in claim 7, wherein molding said nonelastomeric inner member to said nonelastomeric outer member with said elastomer, includes inhibiting bonding of said elastomer from twenty five to seventy five percent of said outer member inner circumference bonding surface.
11. A method as claimed in claim 7, wherein deforming said nonelastomeric outer ductile member in towards said nonelastomeric inner member includes compressing the elastomer between said inner member outer surface and said elastomeric void section of said nonelastomeric outer ductile member inner surface.
12. A method as claimed in claim 11, wherein compressing the elastomer between said inner member outer surface and said elastomeric void section of said nonelastomeric outer ductile member inner surface, includes compressing the elastomer witti a compression strain in the range of one to fifty percent.
13. A method of making a bushing, said method comprising: providing a nonelastomeric outer member having an inner circumference bonding surface and a center bore, said outer member center bore containing an elastomer and a nonelastomeric inner member having an outer circumference bonding surface with the Attorney Docket: IR-3464 CMVE)
elastomer bonded to said inner member outer circumference bonding surface and to said outer member inner bonding surface with an elastomeric void defined by said elastomer between said inner member and said outer member, deforming said nonelastomeric outer member in towards said nonelastomeric inner member wherein said elastomeric void is reduced and said nonelastorrxeric outer member is brought into contact with said elastomer with said elastomer between said inner member and said outer member.
14. A method as claimed in claim 13, wherein said elastomer defines a first elastomeric void and a second elastomeric void.
15. A method as claimed in claim 13, wherein said elastomeric void includes an elastomeric void section comprising at least twenty five percent of said, outer member inner circumference bonding surface.
16. A method as claimed in claim 13, wherein said elastomeric void includes an elastomeric void section comprising from twenty five to seventy five percent of said outer member inner circumference bonding surface.
17. A method as claimed in claim 13, wherein deforming said nonelastomeric outer member in towards said nonelastomeric inner member includes compressing the elastomer between said inner member outer surface and said nonelastomeric outer member inner surface.
18. A method as claimed in claim 17, wherein compressing the elastomer between said inner member outer surface and said nonelastomeric outer member inner surface, includes compressing the elastomer with a compression strain in the range of one to fifty percent. Attorney Docket: IR-3464 (MVE)
19. A multiple radial spring rate pivot bushing, said bushing comprising a nonelastomeric inner member having an inner member outer circumference bonding surface and an inner member bore with an inner member center bore axis, said inner member center bore axis offset from an outer circumference center axis of said inner member outer circumference bonding surface, an elastomer bonded to the inner member outer circumference bonding surface, and a ductile nonelastomeric outer member having an inner circumference bonding surface and an outer member center bore with an outer member center bore axis, said outer member center bore axis centered with an inner circumference center axis of said outer member inner circumference bonding surface, said ductile nonelastomeric outer member inner circumference bonding surface having an elastomeric void section, said ductile nonelastomeric outer member containing said elastomer and said inner member with said elastomer bonded to said outer member inner circumference bonding surface except at said elastomeric void section, said ductile nonelastomeric outer member having a deformed reduced diameter wherein said ductile nonelastomeric outer member elastomeric void section contacts said elastomer .
20. A bushing preform, said bushing preform comprising a nonelastomeric inner member having an inner member outer circumference bonding surface and an inner member bore with an inner member center bore axis, said inner member center bore axis offset from an outer circumference center axis of said inner member outer circumference bonding surface, an elastomer bonded to the inner member outer circumference bonding surface, and a ductile nonelastomeric outer member having an inner circumierence bonding surface and an outer member center bore with an outer member center bore axis, said outer member center bore axis centered with an inner circumference center axis of said outer member inner circumference bonding surface, said ductile nonelastomeric outer member containing said elastomer and said inner member with said elastomer bonded to said outer member inner circumference bonding surface, said contained elastomer defining an elastomeric void between said inner member and said outer member, wherein said elastomeric void is removed by deforming Attorney Docket: IR-3464 (MVE)
the ductile nonelastomeric outer member of the bushing preform to a reduced bushing diameter to provide a multiple spring rate bushing .
PCT/US2005/038219 2004-10-22 2005-10-24 Multiple radial spring rate pivot bushing and method of making the same WO2006047435A1 (en)

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