GB2322095A - Moulded parts used as power and/or motion transmission components - Google Patents
Moulded parts used as power and/or motion transmission components Download PDFInfo
- Publication number
- GB2322095A GB2322095A GB9803155A GB9803155A GB2322095A GB 2322095 A GB2322095 A GB 2322095A GB 9803155 A GB9803155 A GB 9803155A GB 9803155 A GB9803155 A GB 9803155A GB 2322095 A GB2322095 A GB 2322095A
- Authority
- GB
- United Kingdom
- Prior art keywords
- component according
- nylon
- skin
- core
- skin portion
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 42
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 13
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 13
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000004033 plastic Substances 0.000 claims abstract description 8
- 229920003023 plastic Polymers 0.000 claims abstract description 8
- 125000002777 acetyl group Chemical class [H]C([H])([H])C(*)=O 0.000 claims abstract description 7
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000004952 Polyamide Substances 0.000 claims description 9
- 229920002647 polyamide Polymers 0.000 claims description 9
- 230000002787 reinforcement Effects 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 5
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 125000001931 aliphatic group Chemical group 0.000 claims description 3
- 229920003235 aromatic polyamide Polymers 0.000 claims description 3
- 229920001470 polyketone Polymers 0.000 claims description 3
- 229920002545 silicone oil Polymers 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims 1
- 239000004677 Nylon Substances 0.000 abstract description 27
- 229920001778 nylon Polymers 0.000 abstract description 27
- 229920000642 polymer Polymers 0.000 abstract description 11
- 238000000465 moulding Methods 0.000 abstract description 6
- 229920001296 polysiloxane Polymers 0.000 abstract description 2
- 239000011162 core material Substances 0.000 description 23
- 229920002302 Nylon 6,6 Polymers 0.000 description 15
- 238000000034 method Methods 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- 238000005452 bending Methods 0.000 description 4
- 239000003365 glass fiber Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920000106 Liquid crystal polymer Polymers 0.000 description 3
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 230000004580 weight loss Effects 0.000 description 3
- 239000004610 Internal Lubricant Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229920013687 Carilon Polymers 0.000 description 1
- 239000004605 External Lubricant Substances 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 229920005570 flexible polymer Polymers 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 229910052961 molybdenite Inorganic materials 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 229920001643 poly(ether ketone) Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
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
A two-part moulding for use as a gear, cam or pulley in a transmission system comprises a core made of a reinforced polymer, e.g. nylon or acetal, for strength, and an outer skin of a polymeric plastics material which has good tribological properties but is also a mechancical load-bearing material. The skin may be unalloyed nylon or acetal, or may include PTFE and/or silicone and/or molybdenum disulphide.
Description
This invention relates to moulded parts for use in mechanical power and motion transmissions, and also to the manufacture of such parts.
The fact that moulded polymer parts can run under dry conditions is a major factor in choosing them for mechanical power and motion transmissions. To obtain high performance, 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. However, the use of polymer composites in this way can lead to a compromise in performance as:
internal lubricants can weaken the bulk strength
of the polymer
internal reinforcements can lead to surfaces which
have poor tribological properties because the
fibres are often left on or protrude from the
surface, interfere with sliding and so result in
high wear.
In W093/21450 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.
It is an object of the present invention to provide moulded parts, especially for gear and cam transmission systems, which overcome these deficiencies.
In accordance with the invention there is provided 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. In the case of components which mesh together, such as gears, cams, tooth belt and vee belt pulleys and both male and female bearing journals, 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.
Certain embodiments of moulded parts in accordance with the invention have the following characteristics, either singly or in combination.
1. 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 zc=(1/n x(((1-vl**2)/E1) + ((1-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/mm2.
2. The outer layer has a coefficient of friction, , of
below 0.4.
3. The outer layer is able to withstand a combination of
Hertzian pressure x slide velocity PV, represented by
the formula or its derivative: PV=ZcV where:- Zc 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).
4. The inner core is able adequately to support the
bending stresses imposed upon it which are usually up
to and above SOMPa and which broadly obey the
following formula or its derivatives:
Bending stress Q=Ft/(b.mn) where:- the value of tangential force Ft varies according to
application and size
the value of face width b varies according to
application and size
the value of normal module mn varies according to
application between the limits of 0.4 and 10.
If a material is too weak in tensile stress it will fail due to root bending stress overload and Hertzian stress fatigue.
If a material has poor lubricity it will fail due to wear.
Thus 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.
Examples of materials which can be used are the following:
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.
An absorbent core material may be used with a
specialised permeable surface layer to enhance
lubricity.
Conductive surface coatings may be used
particularly for statically sensitive applications.
None of the above preclude the possibility of operating these moulded components in external lubricants such as oil, grease, water or aqueous based substances.
Manufacturing methods by which the moulded parts may be made include:
the Battenfeld GmbH 2K process employing a single
shot twin barrel injection technique.
the Admix Ltd process employing a single shot side
chamber injection technique, and
by over-moulding a specialised surface layer upon
a supporting core.
Other methods such as powder coating could alternatively be employed. 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.
Gear mouldings using these two techniques have been successfully produced. As a result it has been possible to demonstrate that
complex shapes such as gears with many teeth and
with normally accepted flange and rim geometries
can be successfully moulded
superior wear (as compared to plain polymer and
reinforced polymer composites) resulting from dual
moulding a PTFE enriched nylon or acetal surface
layer onto a core of glass fibre reinforced nylon
under a high torque and speed. the surface bond between the surface and core
materials is able to withstand the Hertzian sub
surface stresses as well as the bending stresses
resulting from normal gear action without
degradation.
Various materials have been found acceptable for both the core and the skin. The core is preferably a reinforced polyamide (nylon) material or a reinforced acetal material.
Alternatively, one can use polybutyleneterephthalate (PBT), polyestersulphone (PES), aliphatic polyketone ("Carilon"), liquid crystal polymer (LCP) or polyetherketone (peek), suitably reinforced. 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. Alternatively, one can use an acetal material,
PBT, PES, "carillon", LCP or PEEK, as above. Each of these materials, if not used in unalloyed form, can be alloyed with one or more of PTFE, silicone oil, molybdenum disulphide, graphite and mineral lubricants. If PTFE is used, it is preferably in an amount up to 30% by weight, more preferably between 15 and 20% by weight.
The following Table 1 shows test results for various materials. Gears comprising a driven gear and a driving gear were moulded and tested for weight loss over 24 hours under load. The results show clearly that the monolithic gears without fibre reinforcement performed poorly. The monolithic polyamide nylon gears with fibre reinforcement performed better, but the two-part moulded gears in accordance with the invention all showed very little weight loss.
TABLE 1
Material Grade Base Weight loss Key Polymer of tested gears over 24hrs on load Monolithic acetal Acetal 4.908 C1 (driven) Monolithic acetal Acetal 3.916 C1 (driver) Monolithic polyamide Nylon 66 1.68 C2 (driven) Monolithic polyamide Nylon 66 1.688 C2 (driver) Monolithic polyamide 30% GF Nylon 66 0.485 C2 (driven) Monolithic polyamide 30% GF Nylon 66 0.517 C2 (driver) Unalloyed Nylon Skin/30% GF Nylon Core Nylon 66 0.173 2P1 (driven) Unalloyed Nylon Skin/30% GF Nylon Core Nylon 66 0.153 2P1 (driver) 20% PTFE Nylon Skin/30% GF Nylon Core Nylon 66 0.088 2P2 (driven) 20% PTFE Nylon Skin/30% GF Nylon Core Nylon 66 0.078 2P2 (driver) Unalloyed Nylon Skin/30% CF Nylon Core Nylon 66 0.187 2P3 (driven) Unalloyed Nylon Skin/30% CF Nylon Core Nylon 66 0.181 2P3 (driver) 20% PTFE Nylon Skin/30% CF Nylon Core Nylon 66 0.082 2P4 (driven) 20% PTFE Nylon Skin/30% CF Nylon Core Nylon 66 0.09 2P4 (driver) Unalloyed Nylon Skin/43% GF Nylon Core Nylon 66 0.09 2P5 (driven) Unalloyed Nylon Skin/43% GF Nylon Core Nylon 66 0.087 2P5 (driver) Note: C1 and C2 are controls. P1 to P5 are of two part construction.
GF - Glass Fibre. CF - Carbon Fibre
Claims (12)
1. 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.
2. A component according to claim 1, in which the core portion is a reinforced polymeric plastics material.
3. A component according to claim 2, in which the core portion comprises reinforced polyamide or reinforced acetal material.
4. A component according to claim 1, in which the core portion is made of polybutyleneterephthalate, polyestersulphone or aliphatic polyketone.
5. A component according to any preceding claim, in which the core portion is reinforced with one or more of glass, carbon, steel, ceramic and aramid fibres.
6. A component according to claim 5, in which the fibre reinforcement is present in an amount of 10 to 70% by weight, preferably 30 to 45% by weight.
7. A component according to any preceding claim, in which the skin portion comprises a polyamide material.
8. A component according to any of claims 1 to 6, in which the skin portion comprises an acetal material.
9. A component according to any of claims 1 to 6, in which the skin portion comprises polybutyleneterephthalate, polyestersulphone or aliphatic polyketone.
10. A component according to any of claims 7 to 9, in which the skin portion includes polytetrafluoroethylene.
11. A component according to claim 10, in which the polytetrafluoroethylene is present in an amount up to 30% by weight, preferably 15 to 20% by weight.
12. A component according to any of claims 7 to 11, in which the skin portion comprises silicone oil and/or molybdenum disulphide.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9702918.5A GB9702918D0 (en) | 1997-02-13 | 1997-02-13 | Composite material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9803155D0 GB9803155D0 (en) | 1998-04-08 |
| GB2322095A true GB2322095A (en) | 1998-08-19 |
Family
ID=10807537
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB9702918.5A Pending GB9702918D0 (en) | 1997-02-13 | 1997-02-13 | Composite material |
| GB9803155A Withdrawn GB2322095A (en) | 1997-02-13 | 1998-02-13 | Moulded parts used as power and/or motion transmission components |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB9702918.5A Pending GB9702918D0 (en) | 1997-02-13 | 1997-02-13 | Composite material |
Country Status (2)
| Country | Link |
|---|---|
| GB (2) | GB9702918D0 (en) |
| WO (1) | WO1998035820A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1126174A3 (en) * | 2000-02-14 | 2002-06-19 | Joma-Hydromechanic GmbH | Plastic gear for gear pump |
| WO2014139676A1 (en) * | 2013-03-14 | 2014-09-18 | Wilo Se | Pump unit comprising a one-piece bearing unit |
| CN114746254A (en) * | 2019-11-12 | 2022-07-12 | 赛峰短舱公司 | Component with improved wear resistance |
Citations (6)
| 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 |
| GB2253261A (en) * | 1991-02-27 | 1992-09-02 | Nippon Oil Co Ltd | Composite rolls |
| US5296183A (en) * | 1992-08-21 | 1994-03-22 | Dow-United Technologies Composite Products, Inc. | Method for comolding property enhancing coatings to composite articles |
| US5688054A (en) * | 1992-04-09 | 1997-11-18 | Rabe; Thore | Process for the production of a sleeve-shaped friction bearing and a friction bearing produced according to this process |
Family Cites Families (8)
| 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 |
| DE2820180C2 (en) * | 1978-05-09 | 1980-07-31 | Elteka Kunststoff-Technik Gmbh, 7950 Biberach | Polyamide laminated body |
| AT362149B (en) * | 1979-03-14 | 1981-04-27 | Faigle Heinz Kg | PLASTIC / PLASTIC PAIRINGS IN TRIBOLOGICAL SYSTEMS |
| JPS6021541B2 (en) * | 1978-09-25 | 1985-05-28 | オイレス工業株式会社 | Sliding member coated with synthetic resin and its manufacturing method |
| DE2947025A1 (en) * | 1979-11-22 | 1981-06-04 | Glyco-Metall-Werke Daelen & Loos Gmbh, 6200 Wiesbaden | TWO OR MULTILAYER COMPOSITE |
| JPS6210165A (en) * | 1985-07-09 | 1987-01-19 | Taiho Kogyo Co Ltd | Resin bearing materials and their manufacturing method |
| NL8603138A (en) * | 1986-12-10 | 1988-07-01 | Stamicarbon | MULTI-LAYER POLYAMIDE SHAPE BODY. |
| DD292875A5 (en) * | 1990-03-19 | 1991-08-14 | Technische Hochschule "Carl Schorlemmer" Leuna-Merseburg,De | PROCESS FOR PRODUCING COMPOSITE BODIES FROM THERMOPLASTIC MATERIALS |
-
1997
- 1997-02-13 GB GBGB9702918.5A patent/GB9702918D0/en active Pending
-
1998
- 1998-02-13 GB GB9803155A patent/GB2322095A/en not_active Withdrawn
- 1998-02-13 WO PCT/GB1998/000336 patent/WO1998035820A1/en not_active Ceased
Patent Citations (6)
| 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 |
| GB2253261A (en) * | 1991-02-27 | 1992-09-02 | Nippon Oil Co Ltd | Composite rolls |
| US5688054A (en) * | 1992-04-09 | 1997-11-18 | Rabe; Thore | Process for the production of a sleeve-shaped friction bearing and a friction bearing produced according to this process |
| US5296183A (en) * | 1992-08-21 | 1994-03-22 | Dow-United Technologies Composite Products, Inc. | Method for comolding property enhancing coatings to composite articles |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1126174A3 (en) * | 2000-02-14 | 2002-06-19 | Joma-Hydromechanic GmbH | Plastic gear for gear pump |
| WO2014139676A1 (en) * | 2013-03-14 | 2014-09-18 | Wilo Se | Pump unit comprising a one-piece bearing unit |
| CN114746254A (en) * | 2019-11-12 | 2022-07-12 | 赛峰短舱公司 | Component with improved wear resistance |
| EP4058276A1 (en) * | 2019-11-12 | 2022-09-21 | Safran Nacelles | Part having improved abrasion resistance |
| CN114746254B (en) * | 2019-11-12 | 2025-07-01 | 赛峰短舱公司 | Components with improved wear resistance |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1998035820A1 (en) | 1998-08-20 |
| GB9702918D0 (en) | 1997-04-02 |
| GB9803155D0 (en) | 1998-04-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |