EP4555228A1 - Dünnringlager und computertomograph mit einem solchen dünnringlager - Google Patents
Dünnringlager und computertomograph mit einem solchen dünnringlagerInfo
- Publication number
- EP4555228A1 EP4555228A1 EP23712791.5A EP23712791A EP4555228A1 EP 4555228 A1 EP4555228 A1 EP 4555228A1 EP 23712791 A EP23712791 A EP 23712791A EP 4555228 A1 EP4555228 A1 EP 4555228A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ring
- raceway
- bearing
- thin
- inner ring
- 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- Withdrawn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
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
- F16C33/58—Raceways; Race rings
- F16C33/64—Special methods of manufacture
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
- A61B6/032—Transmission computed tomography [CT]
- A61B6/035—Mechanical aspects of CT
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
-
- 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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
- F16C19/163—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls with angular contact
- F16C19/166—Four-point-contact ball bearings
-
- 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
- F16C33/58—Raceways; Race rings
- F16C33/583—Details of specific parts of races
- F16C33/585—Details of specific parts of races of raceways, e.g. ribs to guide the rollers
-
- 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
- F16C33/58—Raceways; Race rings
- F16C33/62—Selection of substances
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
-
- 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
- F16C2223/00—Surface treatments; Hardening; Coating
- F16C2223/10—Hardening, e.g. carburizing, carbo-nitriding
-
- 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
- F16C2316/00—Apparatus in health or amusement
- F16C2316/10—Apparatus in health or amusement in medical appliances, e.g. in diagnosis, dentistry, instruments, prostheses, medical imaging appliances
Definitions
- the invention relates to a thin ring bearing comprising at least one outer ring, at least one inner ring and a plurality of spherical rolling bodies, wherein the at least one inner ring is designed with an inner diameter of greater than 700 mm, in particular for use in a computer tomograph.
- the bearing arrangement has a one-piece inner ring and a one-piece outer ring, each with a hollow cylindrical basic contour.
- the DE 10 2017 222 208 B3 describes a computer tomography device and a method for arranging a bearing ring of a rolling bearing. It is stated there, that computer tomography devices typically have a stationary part and a rotating part, the rotating part having a radiation source for X-rays and a detector for the X-rays, which interacts with the radiation source.
- the rotating part can, for example, have a mass of approximately 600 to 900 kg and rotate at a speed of approximately 60 to 240 revolutions per minute. A very precise, smooth and noiseless rotation is essential.
- the rotational movement of the rotating part can be driven with the aid of a direct drive or with the aid of a drive belt which interacts with a pulley of the rotating part.
- a rolling bearing can be used to pivot the rotating part relative to the stationary part.
- a rolling bearing has a plurality of rolling elements and several raceways for rolling the rolling elements.
- a thin ring bearing comprising at least one inner ring, at least one outer ring and a plurality of spherical rolling bodies, the at least one inner ring being formed with an inner diameter Di of greater than 700 mm, the at least one outer ring and the at least one inner ring being made of one unhardened metallic base material with a hardness of less than 58 HRC are formed, wherein the at least one outer ring and the at least one inner ring each form at least one raceway area in contact with the rolling elements, and wherein the base material is laser-hardened in the at least one raceway area and the raceway area has a hardness of has at least 58 HRC.
- the metallic base material is tempered to a hardness of 250 +100HV before laser hardening.
- the metallic base material is made of steel with a proportion of
- Residual iron and unavoidable impurities or other elements such as Si, Al,
- outer ring and an inner ring each of which has two raceway areas which are arranged separately, annularly and parallel to one another.
- the two raceway areas are preferably separated from one another by an annular groove.
- the groove serves as a lubricant reservoir and prevents the heat-affected zones of two raceway areas from overlapping.
- each of which has an annular raceway area.
- the two outer rings and/or the two inner rings can be in have local recesses in an area where their careers adjoin one another.
- a free surface of the at least one raceway area, which forms a raceway for the rolling elements, can be machined and/or rolled.
- the free surface of the at least one raceway area, which forms a raceway for the rolling elements, is in particular honed.
- the at least one raceway region is preferably designed to have different thicknesses when viewed across a cross section through the at least one outer ring or the at least one inner ring.
- a penetration depth of the laser hardening in the base material is maximal in the area of a pressure angle curve.
- a computer tomograph comprising at least one thin ring bearing according to the invention, has proven itself in terms of achievable high running accuracy, extremely smooth running, freedom from play and high tilting rigidity of the thin ring bearing.
- FIG. 1 to 4 are intended to explain thin ring bearings according to the invention by way of example. This shows:
- Figure 1 shows a section through a first thin ring bearing with an outer ring and an inner ring
- Figure 2 shows an enlarged section of the first thin ring bearing according to Figure 1 in the area of the cut surfaces
- Figure 3 shows a section through a second thin ring bearing with two outer rings and two inner rings
- Figure 4 shows an enlarged section of the second thin ring bearing according to Figure 3 in the area of the cut surfaces.
- Figure 1 shows a section through a first thin ring bearing 1 with an outer ring 3 and an inner ring 2. Furthermore, a plurality of spherical rolling bodies 4 are present.
- the inner ring 2 is designed with an inner diameter Di of greater than 1 m.
- the outer ring 3 and the inner ring 2 are formed from an unhardened metallic base material 6 with a hardness of less than 58 HRC (see Figure 2).
- the outer ring 3 and the inner ring 2 each form at least one raceway area 7a, 7b, 7c, 7d in contact with the rolling elements 4.
- the base material e is laser-hardened in the raceway areas 7a, 7b, 7c, 7d and the raceway areas 7a, 7b, 7c, 7d have a hardness of at least 58 HRC.
- a ratio A/Di is in the range 1:30 to 1:150, with the distance A between the inside diameter Di and an outside diameter of the thin ring bearing 1 (seen in cross section) being recorded.
- the outer ring 3 and the inner ring 2 each have two raceway regions 7a, 7b which are arranged separately from one another and run in an annular manner and parallel to one another; 7c, 7d, which are separated from each other by an annular groove 9a, 9b.
- Figure 2 shows an enlarged section of the first thin ring bearing 1 according to Figure 1 in the area of the cut surfaces (see the area circled with a dashed line in Figure 1).
- the pressure angles 5 are indicated by dashed lines in Figure 2.
- a free surface 8 of the raceway areas 7a, 7b, 7c, 7d each forms a raceway for the rolling elements 4.
- Figure 3 shows a section through a second thin ring bearing 1 'with two outer rings 3a, 3b and two inner rings 2a, 2b. Furthermore, a plurality of spherical rolling bodies 4 are present.
- the inner rings 2a, 2b are designed with an inner diameter Di of greater than 700 mm.
- the outer rings 3a, 3b and the inner rings 2a, 2b are formed from an unhardened metallic base material e with a hardness of less than 58 HRC (see Figure 4).
- the outer rings 3a, 3b and the inner rings 2a, 2b each form a raceway area 7a, 7b, 7c, 7d in contact with the rolling elements 4.
- the base material 6 is laser-hardened in the raceway areas 7a, 7b, 7c, 7d and the raceway areas 7a, 7b, 7c, 7d have a hardness of at least 58 HRC.
- a ratio A/Di is in the range 1:30 to 1:150, with the distance A between the inner diameter Di and an outer diameter of the thin ring bearing 1 ' (seen in cross section) is recorded.
- the outer rings 3a, 3b and the inner rings 2a, 2b each have an annular raceway area 7a, 7b; 7c, 7d on.
- Figure 4 shows an enlarged section of the second thin ring bearing 1 'according to Figure 3 in the area of the cut surfaces (see the area circled with a dashed line in Figure 3).
- the pressure angles 5 are indicated by dashed lines in Figure 4.
- a free surface 8 of the raceway areas 7a, 7b, 7c, 7d each forms a raceway for the rolling elements 4.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Medical Informatics (AREA)
- Biophysics (AREA)
- Radiology & Medical Imaging (AREA)
- Pulmonology (AREA)
- Theoretical Computer Science (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- High Energy & Nuclear Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Optics & Photonics (AREA)
- Pathology (AREA)
- Organic Chemistry (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Thermal Sciences (AREA)
- Rolling Contact Bearings (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022117646.0A DE102022117646A1 (de) | 2022-07-14 | 2022-07-14 | Dünnringlager und Computertomograph mit einem solchen Dünnringlager |
| PCT/DE2023/100191 WO2024012615A1 (de) | 2022-07-14 | 2023-03-14 | Dünnringlager und computertomograph mit einem solchen dünnringlager |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4555228A1 true EP4555228A1 (de) | 2025-05-21 |
Family
ID=85726159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23712791.5A Withdrawn EP4555228A1 (de) | 2022-07-14 | 2023-03-14 | Dünnringlager und computertomograph mit einem solchen dünnringlager |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20260029021A1 (de) |
| EP (1) | EP4555228A1 (de) |
| JP (1) | JP2025519817A (de) |
| CN (1) | CN119173699A (de) |
| DE (1) | DE102022117646A1 (de) |
| WO (1) | WO2024012615A1 (de) |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE905561C (de) * | 1939-07-21 | 1954-03-04 | Heinrich Giesecke | Verfahren zur Herstellung von Waelzlagern |
| US3714694A (en) * | 1971-06-09 | 1973-02-06 | Formmet Corp | Process of making a composite bearing race or the like |
| RU2089622C1 (ru) * | 1994-05-16 | 1997-09-10 | Способ поверхностной термической обработки колец подшипника | |
| JP2002081442A (ja) * | 2000-09-08 | 2002-03-22 | Ntn Corp | 超薄肉形転がり軸受 |
| JP2005061431A (ja) * | 2003-08-11 | 2005-03-10 | Nsk Ltd | 玉軸受 |
| JP2005214330A (ja) * | 2004-01-30 | 2005-08-11 | Ntn Corp | 四点接触玉軸受およびその製造方法 |
| JP2005308067A (ja) * | 2004-04-20 | 2005-11-04 | Nsk Ltd | 転がり軸受 |
| DE102004062116B3 (de) | 2004-12-23 | 2006-05-11 | Ab Skf | Lageranordnung für einen Computertomographen |
| JP2006226496A (ja) * | 2005-02-21 | 2006-08-31 | Ntn Corp | 転がり軸受および転がり軸受用樹脂製保持器 |
| DE102007049071A1 (de) | 2007-10-12 | 2009-04-16 | Schaeffler Kg | Drahtwälzlager |
| ES2638368T3 (es) * | 2009-05-06 | 2017-10-20 | Aktiebolaget Skf (Publ) | Corona giratoria |
| DE102009056038B4 (de) | 2009-11-27 | 2022-05-19 | Schaeffler Technologies AG & Co. KG | Verfahren zur Herstellung eines Lagerrings für ein Wälzlager, insbesondere für ein Dünnringlager, und Wälzlager, insbesondere Dünnringlager, umfassend wenigstens einen Lagerring hergestellt nach dem Verfahren |
| DE102010015062B4 (de) * | 2010-04-15 | 2018-10-25 | Siemens Healthcare Gmbh | Vorrichtung zur Lagerung und zum Antrieb eines kippbaren Teils einer Gantry eines Computertomographiegerätes und Computertomographiegerät |
| JP5587044B2 (ja) * | 2010-06-08 | 2014-09-10 | 株式会社アイエイアイ | 転動体転動面の熱処理方法 |
| DE102010053203A1 (de) * | 2010-12-03 | 2012-06-06 | Imo Holding Gmbh | Dichtungselement |
| JP5890636B2 (ja) * | 2011-09-06 | 2016-03-22 | Ntn株式会社 | 車輪用軸受装置 |
| KR101530330B1 (ko) * | 2013-12-31 | 2015-06-22 | 주식회사 베어링아트 | 볼 베어링 |
| DE102016221993B4 (de) * | 2016-11-09 | 2018-08-02 | Schaeffler Technologies AG & Co. KG | Verfahren zur Herstellung eines Wälzlagerrings mit verbesserter Robustheit gegen die Bildung von White Etching Cracks (WEC) |
| DE102017222208B3 (de) | 2017-12-07 | 2019-04-18 | Daniel Basener | Computertomographiegerät mit einem Dreipunkt-Kugellager und Verfahren zum Anordnen eines Lagerrings eines Wälzlagers |
| US10794422B1 (en) * | 2019-05-22 | 2020-10-06 | General Electric Company | System and method for assembling a slewing ring bearing with a predetermined preload |
| IT202000026608A1 (it) * | 2020-11-09 | 2022-05-09 | Skf Ab | Unita’ cuscinetto in acciaio a basso teneore di carbonio |
-
2022
- 2022-07-14 DE DE102022117646.0A patent/DE102022117646A1/de not_active Withdrawn
-
2023
- 2023-03-14 EP EP23712791.5A patent/EP4555228A1/de not_active Withdrawn
- 2023-03-14 CN CN202380041572.1A patent/CN119173699A/zh active Pending
- 2023-03-14 WO PCT/DE2023/100191 patent/WO2024012615A1/de not_active Ceased
- 2023-03-14 US US18/994,362 patent/US20260029021A1/en active Pending
- 2023-03-14 JP JP2024574715A patent/JP2025519817A/ja not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE102022117646A1 (de) | 2024-01-25 |
| JP2025519817A (ja) | 2025-06-26 |
| WO2024012615A1 (de) | 2024-01-18 |
| US20260029021A1 (en) | 2026-01-29 |
| CN119173699A (zh) | 2024-12-20 |
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