EP2315957A2 - Käfig aus kunststoff sowie verfahren zur herstellung eines käfigs - Google Patents
Käfig aus kunststoff sowie verfahren zur herstellung eines käfigsInfo
- Publication number
- EP2315957A2 EP2315957A2 EP09736107A EP09736107A EP2315957A2 EP 2315957 A2 EP2315957 A2 EP 2315957A2 EP 09736107 A EP09736107 A EP 09736107A EP 09736107 A EP09736107 A EP 09736107A EP 2315957 A2 EP2315957 A2 EP 2315957A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cage
- radiation
- plastic
- rolling
- rolling elements
- 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- Withdrawn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
- 239000004033 plastic Substances 0.000 title claims abstract description 30
- 229920003023 plastic Polymers 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 230000005855 radiation Effects 0.000 claims abstract description 38
- 238000005096 rolling process Methods 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000000049 pigment Substances 0.000 claims description 16
- 230000008859 change Effects 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 6
- 230000005670 electromagnetic radiation Effects 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 206010073306 Exposure to radiation Diseases 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 13
- 238000004132 cross linking Methods 0.000 description 16
- 229920002302 Nylon 6,6 Polymers 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000010137 moulding (plastic) Methods 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 230000003278 mimic effect Effects 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/38—Ball cages
- F16C33/44—Selection of substances
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/46—Cages for rollers or needles
- F16C33/56—Selection of substances
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C43/00—Assembling bearings
- F16C43/04—Assembling rolling-contact bearings
- F16C43/06—Placing rolling bodies in cages or bearings
Definitions
- the invention relates to a method according to the preamble of claim 1 for producing a rolling element receiving cage of a rolling bearing, a cage produced according to this method according to claim 6 and a cage according to claim 7.
- cages for receiving rolling elements made of plastic for example from a thermoplastic by injection molding.
- Such cages made of plastic allow the assembly of the body of the cage with the rolling elements as a last step.
- cages with a body made of a thermoplastic have only low mechanical strength at high temperatures.
- the selection of special thermoplastics with high heat resistance as material for the body of the cage significantly increases its production costs.
- the addition of filling materials reduces the breaking strength of the cages, especially with a high content of filling material.
- EP 0 644 344 B1 describes a method for producing a rolling element receiving cage of a roller bearing, wherein the body of the cage is provided from a crosslinkable under the action of radiation, in particular under the action of beta-radiation plastic, and wherein the body of the cage in the further Course of the process is equipped with rolling elements.
- the provided body of the cage is first equipped with the rolling elements and then exposed to the radiation. It proves to be disadvantageous that the rolling elements accommodated in the body partially shield the adjoining region of the body from the radiation, so that the solidification of the body is incomplete, especially in the vicinity of the rolling bodies.
- the invention is based on the finding that the crosslinking at room temperature leads only to a slight stiffening of the body of the cage, so that even a previously cross-linked body of the cage readily can be equipped with the rolling elements. Only at higher temperatures does the cross-linking become noticeable by an increased elastic modulus compared to non-cross-linked cages. The previous crosslinking of the plastic of the body of the cage thus does not hinder the fitting of the cage.
- the networking immediately after the provision of the body of the cage for example by injection molding of the plastic, can be performed while the assembly of the body with the rolling elements of the networking time, if necessary ., can also be carried out spatially, separately.
- Crosslinked cages can be kept in stock as intermediates, which can be equipped with the rolling elements when needed.
- a heat treatment of the body of the cage is carried out prior to loading the cage with the rolling elements.
- This heat treatment in addition to crosslinking by the radiation, serves to mechanically strengthen the body of the cage.
- the heat treatment can be carried out by heat radiation, which irradiates either the body of the cage as a whole or only individual portions of the body, for example, those portions of the body that do not directly absorb the rolling elements.
- the heat treatment is carried out after exposure to the radiation, so that the cage, which is only slightly stiffened by the crosslinking radiation at room temperature, is solidified by the heat treatment to such an extent that the subsequent assembly of the Caged with the rolling elements is facilitated.
- the radiation causing the crosslinking of the plastic it is provided that the radiation generates high-energy electromagnetic radiation.
- magnetic radiation, in particular X-ray radiation is.
- Roentgen radiation can be applied in a simple way, especially in comparison to alpha or beta radiation;
- the cages provided by the crosslinkable plastic on a conveyor belt can leave the plastic molding device, especially the injection molding device, and be guided to a chamber in which the X-ray radiation acts on the cages, so that the cross-linking of the plastic of the cages immediately following the cages Provision of cages can be performed.
- the provided body of the cage comprises pigments which undergo a color change under the action of the radiation.
- the pigments added to the material of the body alter the mechanical properties of the body only negligibly, but the color change of the pigments makes it possible to detect whether the body was exposed to the radiation or whether the radiation uniformly irradiated the body.
- the pigments allow to detect whether the crosslinking of the material of the cage has been completed and thus whether the process step is complete.
- pigments may be provided in the material of the body of the cage regardless of whether the placement of the cage is performed before or after the irradiation of the body. It is further understood that pigments may also indicate whether the body of the cage has undergone a heat treatment. If required, two types of pigments can be provided, the first type showing a color change upon irradiation with high-energy radiation, especially with X-ray radiation, and the second type of pigments having a color change during a heat treatment.
- the choice of pigments, the arrangement of the pigments on the surface or in the depth of the body of the cage and the conditions under which the pigments have the color change further allows to enable a coding of the cage represented by the pigments such that a Certain cages or a certain batch of cages are easily identifiable and counterfeits are easily detectable, since a counterfeiter can simply mimic a color of the cage, however, the selection and arrangement of the pigments before the color change can be kept secret and in case of need in the short term and easy without the color of the cage changing significantly after the color change of the pigments.
- FIG. 1 shows stress-strain curves for a radiation-crosslinkable plastic taken at room temperature (left partial image) and at higher temperatures (right partial image), and FIG.
- FIG. 2 shows schematically a flow chart for exemplary implementation of the method according to the invention in the production of an embodiment of a cage according to the invention. Detailed description of the drawing
- Fig. 1 shows two partial diagrams two stress-strain curves, which were taken in a tensile test according to DIN EN ISO 53455 on a radiation-crosslinkable plastic (PA66, polyamide 66), before and after the crosslinking of the plastic under the influence of X-rays .
- PA66 radiation-crosslinkable plastic
- a PA66 plastic cage crosslinked at room temperature can be equipped with rolling elements just as easily as a non-networked cage. It is also within the spirit of the invention if the radiation crosslinked cage has reduced elongation at break compared to the non-crosslinked cage at room temperature.
- Fig. 2 shows an exemplary implementation of the method according to the invention.
- the body of the cage is provided;
- the body consists of a radiation-crosslinkable thermoplastic material, such as PA66, or of a thermoset.
- the body has been obtained by a plastic molding process, in particular as an injection molded part.
- a second method step 2 the body is exposed to high-energy radiation, in particular preferably X-ray radiation.
- high-energy radiation in particular preferably X-ray radiation.
- This radiation leads to a cross-linking of the plastic, which causes only a slight solidification of the cage body at room temperature, but at higher temperatures.
- the body of the cage is equipped with rolling elements; For this purpose, the initially provided corpus on recordings for the rolling elements.
- a heat treatment 4, 5 or 6 can be provided.
- the heat treatment of the body can be carried out as a further process step 4 after the radiation cross-linking of the material of the body, in addition or alternatively after the provision of the body of the cage before performing the irradiation as a further process step 5 or again in addition or alternatively to the two aforementioned possibilities as further process step 6 during the assembly of the body of the cage with the rolling elements.
- the invention has been explained above with reference to an embodiment in which a body made of PA66 was provided. It is understood that other radiation-crosslinkable plastics can be provided. In particular, other polyamide types, polyether Etherketonart, polypropylene, polyethylene or polyurethane may be provided as a plastic. It can further be provided that the radiation-crosslinkable plastic contains plasticizers or crosslinking promoters as admixtures. Furthermore, it can also be provided that the plastic may contain other additives such as reinforcing fibers.
- the body of the cage as a whole was formed of the radiation-crosslinkable plastic.
- the invention also relates to such cages, which consist only partially, for example in the area of the receptacles for the rolling elements, of a radiation-crosslinkable plastic, but are formed in other areas of a different material.
- the heat treatment 4, 5 or 6 described for the exemplary embodiment described above can be carried out on the entire body of the cage or only in sections, for example in the region of the receptacles for the rolling elements.
- the radiation may be different or complementary to the described implementation example, gamma radiation, ultraviolet radiation or high-energy radiation in the visible light range. Furthermore, it can be provided that even high-energy particle beams such as alpha or beta rays cause the crosslinking of the material of the cage.
- the invention is also not limited to such methods in which initially the body is provided as an injection molded part.
- the body may be made by other plastics forming processes and provided for the process described above.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008038577A DE102008038577A1 (de) | 2008-08-20 | 2008-08-20 | Käfig aus Kunststoff sowie Verfahren zur Herstellung eines Käfigs |
| PCT/DE2009/001176 WO2010020239A2 (de) | 2008-08-20 | 2009-08-18 | Käfig aus kunststoff sowie verfahren zur herstellung eines käfigs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2315957A2 true EP2315957A2 (de) | 2011-05-04 |
Family
ID=41531799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09736107A Withdrawn EP2315957A2 (de) | 2008-08-20 | 2009-08-18 | Käfig aus kunststoff sowie verfahren zur herstellung eines käfigs |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20110135238A1 (de) |
| EP (1) | EP2315957A2 (de) |
| CN (1) | CN102124240A (de) |
| DE (1) | DE102008038577A1 (de) |
| WO (1) | WO2010020239A2 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB825689A (en) * | 1956-10-23 | 1959-12-16 | Skf Svenska Kullagerfab Ab | Cage for rolling bodies in rolling bearings |
| NL9301602A (nl) | 1993-09-16 | 1995-04-18 | Skf Ind Trading & Dev | Werkwijze voor de vervaardiging van een kooi voor een wentellager, een werkwijze voor de vervaardiging van een wentellager met een dergelijke kooi, alsmede een van een dergelijke kooi voorzien wentellager. |
| DE19531332C2 (de) * | 1995-08-25 | 1998-07-16 | Beiersdorf Ag | Verwendung von Etiketten zur Kennzeichnung von Gummiteilen, insbesondere Reifen |
| JP2004028161A (ja) * | 2002-06-24 | 2004-01-29 | Nsk Ltd | 転がり軸受用プラスチック保持器及びその方法、並びに転がり軸受 |
| US7855241B2 (en) * | 2005-10-18 | 2010-12-21 | Sabic Innovative Plastics Ip B.V. | Method of improving abrasion resistance of plastic article using nanoparticles and article produced thereby |
| CN200996412Y (zh) * | 2006-12-29 | 2007-12-26 | 张世伟 | 带式输送机托辊新型专用轴承 |
-
2008
- 2008-08-20 DE DE102008038577A patent/DE102008038577A1/de not_active Withdrawn
-
2009
- 2009-08-18 EP EP09736107A patent/EP2315957A2/de not_active Withdrawn
- 2009-08-18 US US13/059,674 patent/US20110135238A1/en not_active Abandoned
- 2009-08-18 WO PCT/DE2009/001176 patent/WO2010020239A2/de not_active Ceased
- 2009-08-18 CN CN2009801325737A patent/CN102124240A/zh active Pending
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010020239A3 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010020239A2 (de) | 2010-02-25 |
| US20110135238A1 (en) | 2011-06-09 |
| DE102008038577A1 (de) | 2010-02-25 |
| CN102124240A (zh) | 2011-07-13 |
| WO2010020239A3 (de) | 2010-10-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR |
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| AX | Request for extension of the european patent |
Extension state: AL BA RS |
|
| 17P | Request for examination filed |
Effective date: 20110421 |
|
| RBV | Designated contracting states (corrected) |
Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR |
|
| DAX | Request for extension of the european patent (deleted) | ||
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 20140301 |