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WO1998035820A1 - Parties moulees pour transmissions - Google Patents

Parties moulees pour transmissions Download PDF

Info

Publication number
WO1998035820A1
WO1998035820A1 PCT/GB1998/000336 GB9800336W WO9835820A1 WO 1998035820 A1 WO1998035820 A1 WO 1998035820A1 GB 9800336 W GB9800336 W GB 9800336W WO 9835820 A1 WO9835820 A1 WO 9835820A1
Authority
WO
WIPO (PCT)
Prior art keywords
component according
skin portion
core portion
reinforced
skin
Prior art date
Application number
PCT/GB1998/000336
Other languages
English (en)
Inventor
Frederick Jeremy Dugard
Brian Robert Duke
Douglas Walton
Original Assignee
Ctp Davall Limited
The University Of Birmingham
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 Ctp Davall Limited, The University Of Birmingham filed Critical Ctp Davall Limited
Publication of WO1998035820A1 publication Critical patent/WO1998035820A1/fr

Links

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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
    • 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
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
    • 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
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/16—Fillers

Definitions

  • This invention relates to moulded parts for use in mechanical power and motion transmissions, and also to the manufacture of such parts.
  • plastics components such as gears, cams and pulleys are frequently moulded from polymers containing strengthening materials and compounds.
  • the strengthening materials and compounds typically glass fibre or carbon fibre, add to both the strength and the stiffness of components.
  • Injection moulded gears, cams, tooth belt and vee belt pulleys and both male and female bearing journals and shafts are often further modified by the addition of internal lubricants. These in turn increase the lubricity of the components, leading to lower friction and less wear.
  • internal lubricants can weaken the bulk strength of the polymer
  • WO93/21450 there is described a sleeve-shaped friction bearing in which a thin lubrication film of a suitable polymer is applied to a mandrel, and the film is covered by a support layer of hard or flexible polymer.
  • US-A-5219499 describes a helical screw rotor comprising a central shaft, a rotor body, and an outer layer of polymer- based material . The aim is to avoid problems of shrinkage in manufacture and to achieve high precision.
  • the outer layer consists solely of PTFE plastics material . Although PTFE has good frictional properties under pure sliding conditions, it has poor mechanical properties and would not be able to withstand the Hertzian contact stresses which occur in gear transmission systems for example.
  • a moulded power and/or motion transmission component comprising: a) a core portion of a polymeric plastics first material, and b) a skin portion of a polymeric plastics second material bonded to the core portion, wherein the skin portion extends over at least the part of the component which in use makes contact with another component, the first material is stronger than the second material, and the second material has a lower coefficient of friction than the first material but is a mechanical load-bearing material .
  • the first and second materials must be chosen to give sufficient bond strength between the core and the skin portions .
  • the core of the component is preferably made from a polymer containing strengthening reinforcement whilst the skin is made from a material chosen to give low friction, support Hertzian stresses, and have good wear properties.
  • the materials of the respective meshing surfaces need not be of the same or a similar compound in order to give optimum tribological properties at the point of contact .
  • a two-part moulding in accordance with the invention has a number of advantages.
  • Inner core materials can be chosen for maximum strength or other properties, while surface materials can be chosen for optimum surface properties, e.g. tribological properties.
  • moulded parts in accordance with the invention have the following characteristics, either singly or in combination.
  • the outer layer is of a thickness which will withstand the Hertzian contact stresses which range in depth according to the application but are typically up to 2.0 millimetres deep, and obey the following formula, or its derivatives : -
  • Hertzian contact stress z c (l/ ⁇ x( ( (i-vi**2) /ED + ( ( ⁇ -v2**2) /E2) ) where : - the values of Poissons ratio vl and v2 are typically between 0.3 and 0.4 the values of elastic modulus El and E2 are above a level of 0.35 x 10 "3 N/mm 2 .
  • the outer layer has a coefficient of friction, ⁇ , of below 0.4.
  • Z c may be derived as above .
  • V may be derived from the slide/roll ratio.
  • PV is limited by the allowable wear rate at a given stress and temperature, and is a balance of heat -in to heat-out (heat-in being friction/load dependent and heat -out being largely convection and conduction dependent) .
  • this invention brings together a combination of properties which push the power throughput properties of gears, pulleys and cams to higher ' limits than a monolithic construction can achieve.
  • Cost-reduced supporting core material with enhanced property surface material such as when solid lubricants (PTFE powder and fibres, silicone spheres, aramid fibres, graphite and MoS2) are introduced at the surface to enrich it, along also with silicone oil, special mineral and synthetic oil .
  • solid lubricants PTFE powder and fibres, silicone spheres, aramid fibres, graphite and MoS2
  • the first two of these manufacturing methods employ simultaneous injection moulding of the two materials. Size of moulding is not seen as a limitation to this technique; the normal size limitations of injection moulding apply.
  • the core is preferably a reinforced polyamide (nylon) material or a reinforced acetal material.
  • PBT polybutyleneterephthalate
  • PET polyestersulphone
  • Carilon aliphatic polyketone
  • LCP liquid crystal polymer
  • Peek polyetherketone
  • the reinforcement for any of the aforesaid materials can be glass fibres, carbon fibres, steel fibres, ceramic fibres or aramid fibres.
  • the reinforcement is preferably in the range of 10 to 70% by weight, more preferably 30 to 45% by weight.
  • the skin can be unalloyed polyamide (nylon) material, e.g. nylon 66.
  • nylon polyamide
  • PBT PES
  • Carilon LCP or PEEK
  • PTFE silicone oil
  • molybdenum disulphide graphite
  • mineral lubricants if used, it is preferably in an amount up to 30% by weight, more preferably between 15 and 20% by weight.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Gears, Cams (AREA)

Abstract

Moulage en deux parties destiné à servir d'engrenage, came ou poulie dans un système de transmission comprenant un noyau constitué d'un polymère renforcé, tel que le nylon ou l'acétal, pour assurer une bonne résistance, et une pellicule externe en plastique polymère lequel présente de bonnes propriétés tribologiques, et est également un matériau résistant aux charges mécaniques. La pellicule peut être constituée d'un nylon ou acétal pur, ou contenir un produit PTFE et/ou de la silicone et/ou du bisulfure de molybdène.
PCT/GB1998/000336 1997-02-13 1998-02-13 Parties moulees pour transmissions WO1998035820A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9702918.5 1997-02-13
GBGB9702918.5A GB9702918D0 (en) 1997-02-13 1997-02-13 Composite material

Publications (1)

Publication Number Publication Date
WO1998035820A1 true WO1998035820A1 (fr) 1998-08-20

Family

ID=10807537

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/000336 WO1998035820A1 (fr) 1997-02-13 1998-02-13 Parties moulees pour transmissions

Country Status (2)

Country Link
GB (2) GB9702918D0 (fr)
WO (1) WO1998035820A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10006629C2 (de) * 2000-02-14 2002-06-27 Joma Hydromechanic Gmbh Zahnrad aus Kunststoff für eine Zahnradpumpe sowie Verfahren zu seiner Herstellung
DE102013004339A1 (de) * 2013-03-14 2014-09-18 Wilo Se Pumpenaggregat mit einer einstückigen Lagereinheit
FR3102948B1 (fr) * 2019-11-12 2022-06-24 Safran Nacelles Pièce à résistance à l’usure par frottement améliorée

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1383645A (en) * 1971-04-19 1974-02-12 Oiles Industry Co Ltd Composite material for use as a low friction element
JPS5542837A (en) * 1978-09-25 1980-03-26 Oiles Industry Co Ltd Sliding portion material that is coated with synthetic resin and its preparation
WO1981001375A1 (fr) * 1979-11-22 1981-05-28 Glyco Metall Werke Materiau composite a deux ou plusieurs couches
US4371445A (en) * 1979-03-14 1983-02-01 Heinz Faigle Kg Arrangement in pairs of plastic sliding on plastic in tribologic systems
CH643484A5 (en) * 1978-05-09 1984-06-15 Elteka Kunststoff Process for producing a polyamide moulding designed as a laminated article
JPS6210165A (ja) * 1985-07-09 1987-01-19 Taiho Kogyo Co Ltd 樹脂軸受材料およびその製法
EP0273500A1 (fr) * 1986-12-10 1988-07-06 Dsm N.V. Article moulé multicouche en polyamide
DD292875A5 (de) * 1990-03-19 1991-08-14 Technische Hochschule "Carl Schorlemmer" Leuna-Merseburg,De Verfahren zur herstellung von verbundkoerpern aus thermoplastischen werkstoffen
WO1993021450A1 (fr) * 1992-04-09 1993-10-28 Thore Rabe Procede de fabrication d'un palier lisse se presentant sous forme de douille et palier lisse realise selon ledit prodede

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB858124A (en) * 1956-05-09 1961-01-04 Charles Samuel White A method of forming a mechanical assembly having low-friction bearing surfaces between relatively movable parts, and article produced by the method
GB1249586A (en) * 1969-03-26 1971-10-13 Ici Ltd Improved thermoplastic gear wheels
GB1581930A (en) * 1976-03-24 1980-12-31 Curran D G Coverings
JPH04272055A (ja) * 1991-02-27 1992-09-28 Nippon Oil Co Ltd 複合材ロール
US5296183A (en) * 1992-08-21 1994-03-22 Dow-United Technologies Composite Products, Inc. Method for comolding property enhancing coatings to composite articles

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1383645A (en) * 1971-04-19 1974-02-12 Oiles Industry Co Ltd Composite material for use as a low friction element
CH643484A5 (en) * 1978-05-09 1984-06-15 Elteka Kunststoff Process for producing a polyamide moulding designed as a laminated article
JPS5542837A (en) * 1978-09-25 1980-03-26 Oiles Industry Co Ltd Sliding portion material that is coated with synthetic resin and its preparation
US4371445A (en) * 1979-03-14 1983-02-01 Heinz Faigle Kg Arrangement in pairs of plastic sliding on plastic in tribologic systems
WO1981001375A1 (fr) * 1979-11-22 1981-05-28 Glyco Metall Werke Materiau composite a deux ou plusieurs couches
JPS6210165A (ja) * 1985-07-09 1987-01-19 Taiho Kogyo Co Ltd 樹脂軸受材料およびその製法
EP0273500A1 (fr) * 1986-12-10 1988-07-06 Dsm N.V. Article moulé multicouche en polyamide
DD292875A5 (de) * 1990-03-19 1991-08-14 Technische Hochschule "Carl Schorlemmer" Leuna-Merseburg,De Verfahren zur herstellung von verbundkoerpern aus thermoplastischen werkstoffen
WO1993021450A1 (fr) * 1992-04-09 1993-10-28 Thore Rabe Procede de fabrication d'un palier lisse se presentant sous forme de douille et palier lisse realise selon ledit prodede

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 8019, Derwent World Patents Index; AN 80-33582c, XP002067618 *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 185 (C - 428) 13 June 1987 (1987-06-13) *

Also Published As

Publication number Publication date
GB9702918D0 (en) 1997-04-02
GB9803155D0 (en) 1998-04-08
GB2322095A (en) 1998-08-19

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