WO2008058267A2 - Palier de tube cathodique à espaceur en c - Google Patents

Palier de tube cathodique à espaceur en c Download PDF

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Publication number
WO2008058267A2
WO2008058267A2 PCT/US2007/084246 US2007084246W WO2008058267A2 WO 2008058267 A2 WO2008058267 A2 WO 2008058267A2 US 2007084246 W US2007084246 W US 2007084246W WO 2008058267 A2 WO2008058267 A2 WO 2008058267A2
Authority
WO
WIPO (PCT)
Prior art keywords
spring element
contact surfaces
bearing
assembly
cylindrical outer
Prior art date
Application number
PCT/US2007/084246
Other languages
English (en)
Other versions
WO2008058267A3 (fr
Inventor
Martin Scott Galehouse
Original Assignee
The Timken Company
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 The Timken Company filed Critical The Timken Company
Publication of WO2008058267A2 publication Critical patent/WO2008058267A2/fr
Publication of WO2008058267A3 publication Critical patent/WO2008058267A3/fr

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
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/06—Ball or roller bearings
    • F16C25/08—Ball or roller bearings self-adjusting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
    • H01J35/08—Anodes; Anti cathodes
    • H01J35/10—Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes
    • H01J35/101—Arrangements for rotating anodes, e.g. supporting means, means for greasing, means for sealing the axle or means for shielding or protecting the driving
    • H01J35/1017—Bearings for rotating anodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2235/00—X-ray tubes
    • H01J2235/10—Drive means for anode (target) substrate
    • H01J2235/1046—Bearings and bearing contact surfaces
    • H01J2235/1053—Retainers or races
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2235/00—X-ray tubes
    • H01J2235/10—Drive means for anode (target) substrate
    • H01J2235/1093—Measures for preventing vibration

Definitions

  • the present invention is related to bearing assemblies, and in particular to an improved bearing assembly, such as for use in X-ray tube bearing applications, which utilizes a combination of a centrally disposed C-spacer and front and rear outer members to apply a desired preload to associated front and rear supporting raceways.
  • An improved bearing assembly such as for use in X-ray tube bearing applications, which utilizes a combination of a centrally disposed C-spacer and front and rear outer members to apply a desired preload to associated front and rear supporting raceways.
  • Large scale imaging medical devices in which bearings are incorporated, such Computed Tomography (CT) scanners, mammography devices, X-ray tube devices, and other medical detection and assessment applications are demanding mechanical applications for bearings.
  • the bearings utilized to support the large moving components of the medical devices may be required to endure high g-levels, operate in a vacuum, or under extreme thermal conditions while providing the ability to maintain precise position control, produce low levels of noise, and provide thermal and electrical conductivity.
  • the low vibration and noise requirements for medical device bearing applications are driven by the need to maximize patient and medical practitioner comfort during a medical scan of the often nervous or traumatized patient, as well as the need for stability to enable the moving components of the medical device to produce high quality images or scans.
  • a traditional spring-loaded X-ray tube bearing assembly is a complex assembly consisting of a shaft supported on front and rear bearing sub-assemblies.
  • the outer raceway of the rear bearing is maintained in a preload condition by means of a spring disposed coaxially about the shaft, and maintained within the bearing housing by a sleeve member which is coaxially disposed about the shaft adjacent the front bearing sub-assembly and which is secured to the bearing housing. Since only the rear raceway experiences the preload force from the spring, a measurable amount of end-play is present in the supported shaft during operation.
  • End play may produce vibration signatures which are particularly disruptive in medical imaging applications, as they produce vibration at multiple frequencies and can lead to nonlinear, high amplitude, conditions of resonance within the bearing assembly and supporting structures. Accordingly, it would be advantageous to provide an improved bearing assembly for use in X-ray tube bearing applications and operating environments which provides a uniform preload force on both front and rear bearing sub- assemblies, and which eliminates or significantly reduces the presence of any end play in the supported shaft, improving the vibration signature of the bearing assembly during operation. It would further be advantageous to provide an improved bearing assembly which requires fewer components than existing bearing assemblies, and which may be utilized in constrained space applications in medical imaging devices and elsewhere.
  • the present disclosure provides a bearing assembly for use in medical imaging equipment which provides a uniform preload force on both front and rear bearing sub-assemblies, and which eliminates or significantly reduces the presence of any end play in the supported shaft.
  • the bearing assembly includes an axial shaft supported on front and rear bearing sub-assemblies, each of which has an inner and an outer raceway.
  • the outer raceways for each of the bearing sub- assemblies are carried on cylindrical outer members coaxially disposed between the supported shaft and the housing within which the bearing is disposed.
  • a C-spacer spring element is disposed coaxially about the supported shaft medially between each of the cylindrical outer members.
  • An axial preload force is applied on each of th ⁇ cylindrical outer members by contact surfaces of the C-spacer spring element, applying a preload to each of the front and rear bearing sub-assemblies.
  • the C- spacer spring element includes a plurality of tapered contact surfaces which engage
  • Figure 1 is an exploded view of the bearing assembly of the present disclosure
  • Figure 2 is an axial cross-sectional view of the bearing assembly of Fig. 1
  • Figure 3 illustrates a C-spacer spring half-section with exemplary dimensions
  • Figure 4 illustrates an end-view of the C-spacer spring half-section of Fig. 3
  • Figure 5 illustrates an inner end view of a cylindrical outer member
  • Figure 6 illustrates a cross-sectional view of the cylindrical outer member of Fig. 5;
  • Figure 7 illustrates the interaction between the contact surfaces of the C-spacer spring and cylindrical outer members of the present invention.
  • the bearing assembly 100 includes an axial rotating shaft 102 supported for rotation about a longitudinal axis X on a front bearing sub-assembly 104 and a rear bearing sub-assembly 106, each of which has a respective inner raceway 108a, 108b and a respective outer raceway 1 10a, 1 10b.
  • the bearing assembly 100 is configured to provide a uniform preload force on both the front and rear bearing sub- assemblies 104, 106, and to eliminate or significantly reduces the presence of any end play in the supported rotating shaft 102.
  • each of the bearing sub-assemblies 104, 106 is carried on an associated cylindrical outer member 1 12, 1 14 coaxially disposed between the supported shaft 102 and the housing (not shown) within which the bearing assembly 100 is disposed.
  • a C-spacer spring element 1 16 is disposed coaxially about the supported shaft 102 medially between each of the cylindrical outer members 1 12, 1 14.
  • An axial preload force is applied on the annular ends 1 12a, 1 14a of each of the cylindrical outer members 1 12, 1 14 by edges 1 18 of the C-spacer spring element 1 16, applying a preload to each of the front and rear bearing sub-assemblies 104, 106.
  • the edges 1 18 of the C- spacer spring element which are adjacent to the inner annular ends 1 12a, 1 14a of the cylindrical outer members 1 12, 1 14 includes a plurality of tapered contact surfaces 120.
  • These tapered contact surfaces 120 are configured to engage matching tapered contact surfaces 122 on the inner annular ends 1 12a, 1 14a of each of the cylindrical outer members 1 12, 1 14.
  • the taper angle is selected to be 40.0 degrees, as shown in Figure 4 for both the contact surface 120 and the matching contact surfaces 122.
  • the bearing assembly 100 has improved acoustical properties and experiences uniform loading, extending useful service life.
  • various configurations for the C-spacer spring element 1 16 in a bearing assembly 100 of the present disclosure may be used, which differ by spring thickness, taper angle of the contact surfaces 120, initial axial displacement, and final axial displacement.
  • the initial and final axial displacements may be selected in order to achieve a desired preload setting on the bearing sub-assemblies 104, 106 when the rotating shaft 102 expands during operating due to thermal effects.
  • Those of ordinary skill in the art will recognize that various design variables operative to provide benefits and liabilities to the C-spacer spring configurations. Based on the manufacturing tolerances and of the bearing assembly 100, the required axial displacements and an acceptable stress level for a C-spacer spring element 1 16 may be optimized for each application.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Support Of The Bearing (AREA)

Abstract

L'invention porte sur un palier (100) comportant un arbre axial (102) reposant à l'avant et à l'arrière sur deux sous-ensembles (104, 106) de palier, comprenant chacun un chemin de roulement intérieur (108) et un chemin de roulement extérieur (110). Les chemins de roulement extérieurs (110a, 110b) de chacun des sous-ensembles (104, 106) sont portés par des éléments extérieurs cylindriques (112, 114) coaxialement disposés entre l'arbre (102) et le logement du palier (100). Un ressort (116) est disposé coaxialement autour de l'arbre (102) à mi-distance entre les éléments extérieurs cylindriques (112, 114). Une force axiale de préchargement est appliquée sur chacun des éléments extérieurs cylindriques (112, 114) assurant un contact coinçant entre les surfaces de contact (120) du ressort (116) et les surfaces de contact associées (122) des éléments extérieurs (112, 114), lorsqu'on applique une force de préchargement axiale dirigée vers l'extérieur sur chacun des sous-ensembles (104, 106) du palier.
PCT/US2007/084246 2006-11-10 2007-11-09 Palier de tube cathodique à espaceur en c WO2008058267A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US86520206P 2006-11-10 2006-11-10
US60/865,202 2006-11-10

Publications (2)

Publication Number Publication Date
WO2008058267A2 true WO2008058267A2 (fr) 2008-05-15
WO2008058267A3 WO2008058267A3 (fr) 2008-07-31

Family

ID=39365392

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/084246 WO2008058267A2 (fr) 2006-11-10 2007-11-09 Palier de tube cathodique à espaceur en c

Country Status (1)

Country Link
WO (1) WO2008058267A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2264736A1 (fr) * 2009-06-19 2010-12-22 Varian Medical Systems Inc. Ensemble de palier d'anode à réglage de fréquences
US8523448B1 (en) 2012-08-22 2013-09-03 The Timken Company X-ray tube bearing

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1286505A (en) * 1918-05-27 1918-12-03 Frank Beemer Annular ball-bearing.
US4569070A (en) * 1983-09-19 1986-02-04 General Electric Company Thermally compensated x-ray tube bearings

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1286505A (en) * 1918-05-27 1918-12-03 Frank Beemer Annular ball-bearing.
US4569070A (en) * 1983-09-19 1986-02-04 General Electric Company Thermally compensated x-ray tube bearings

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2264736A1 (fr) * 2009-06-19 2010-12-22 Varian Medical Systems Inc. Ensemble de palier d'anode à réglage de fréquences
US7991121B2 (en) 2009-06-19 2011-08-02 Varian Medical Systems, Inc. Frequency tuned anode bearing assembly
US8523448B1 (en) 2012-08-22 2013-09-03 The Timken Company X-ray tube bearing

Also Published As

Publication number Publication date
WO2008058267A3 (fr) 2008-07-31

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