US3719092A - End plate for gyroscope rotor - Google Patents

End plate for gyroscope rotor Download PDF

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Publication number
US3719092A
US3719092A US00026209A US3719092DA US3719092A US 3719092 A US3719092 A US 3719092A US 00026209 A US00026209 A US 00026209A US 3719092D A US3719092D A US 3719092DA US 3719092 A US3719092 A US 3719092A
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US
United States
Prior art keywords
edge portion
marginal edge
gyroscope
rotor
rim
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.)
Expired - Lifetime
Application number
US00026209A
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English (en)
Inventor
C Quinby
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lear Siegler Inc
Original Assignee
Lear Siegler Inc
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 Lear Siegler Inc filed Critical Lear Siegler Inc
Application granted granted Critical
Publication of US3719092A publication Critical patent/US3719092A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
    • G01C19/02—Rotary gyroscopes
    • G01C19/04—Details
    • G01C19/06—Rotors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/12—Gyroscopes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/12—Gyroscopes
    • Y10T74/1282—Gyroscopes with rotor drive

Definitions

  • IIIIIIIIIIII //IIIIIIIII4 ⁇ % IIIIIIII PATENHlD 6 975 j c l a: z, E k
  • This invention relates to gyroscopes and particularly to end discs or end plates for gyroscope rotors.
  • Gyroscopes are well known. It is also well known to construct gyroscopes wherein the rotor is made of a massive rim like a flywheel, which rim is supported for rotation on a shaft by a pair of end discs or end plates which are carried at their centers by suitable low friction bearings. The end plates are commonly press fit or otherwise connected to the rim. Such a structure is hollow and the stator windings are an integral part of the shaft within the hollow rotor. The end plates, in conjunction with the low friction bearings, function to provide both axial and radial constraint of the rotor rim.
  • the end plates may be sub jected to changing radial compressive forces and the resulting deflection takes place along the shaft axis which cause a buckling.
  • This buckling commonly known as cross-coupling, changes the low friction bearing preload resulting in premature failure.
  • the present invention utilizes an end plate or end disc for the rotor of a gyroscope, which end plate has a marginal edge portion that is provided with a multiplicity of cut-outs to define flexural elements or members which are designed to flex in the plane of the marginal edge portion when subjected to radial compressive forces. Flexural elements of the end plate are subjected to pure bending with buckling and its resultant cross-coupling side effects being completely eliminated. It is also apparent in the present invention that each end plate can contain both a compressive radial force and an axial preload force, simultaneously, without interaction of forces.
  • the marginal edge portion is annular in configuration and the flexural elements are defined by cut-outs in the form of apertures, elongated slots and arcuate cut-outs or scollops therebetween which combine, together with the thickness of the marginal edge portion, to define flexural elements that yield preferentially in the plane of the marginal edge portion.
  • FIG. 1 is a vertical sectional view of a gyroscope embodying a rotor including end plates made in accordance with the present invention
  • FIG. 2 is a plan view of an end plate embodying the present invention.
  • FIG. 3 is a side elevational view thereof.
  • a gyroscope 10 includes a gimbal 12 supporting a fixed shaft 14.
  • a rotor 16 is carried on the shaft 14 and includes a heavy rim 18 in order to position the revolving mass at the greatest practical distance from the axis, whereby to obtain a maximum angular momentum, and a pair of end discs 20.
  • the end discs 20 are of annular form and are secured to the rim 18 and to the low-friction bearings 22 mounted on the shaft 14.
  • the position of the rotor 16 is fixed along the axis of the shaft 14 by constraining the inner races of the low friction bearings 22.
  • An interference fit exists between the end plates 20 and the concentric cavities 28 of the rim 18.
  • the shaft 14 also supports a fixed winding 24 as an integral part of the stator and the rim 18 has, as an integral part the rotor lamination stack 26, as is well known.
  • the rim 18 is designed to withstand centrifugal forces to which it may be subjected.
  • heat is generated in the stator and is dissipated by conduction, convection, and radiation establishing thermal gradients throughout the rotor 16.
  • These thermal gradients produce stress regions and in conjunction with the centrifugal induced stresses, in the absence of the invention improvement, produce deformation of the end plates 20 along the axis of the shaft 14, herein referred to as cross-coupling. Such deformation may occur either inwardly or outwardly, but in any case it is unpredictable as to degree and configuration.
  • Outward deformation of the end plates 20 may in some cases be inperceptable because of bearing constraint, but the increased load on the bearing is responsible for heat generation that will rapidly raise the bearing temperature to the point of seizure. Inward deformation of the end plates 20 permits a random axial shift of the rim 18 which gives an erratic and unacceptable performance characteristic.
  • the rim or marginal edge portion 30 of the end plate 20 which is joined to the hub 32 thereof by a web 34, is shaped or provided with a multiplicity of cut-outs so as to cause the rim 30 to be made up of a plurality of short flexural elements or spring arms 36, each of which is designed to flex in the plane of the rim 30 rather than in the plane perpendicular thereto.
  • hub 32 is provided with an aperture 38 which receives a bearing 22 as with a press fit to secure the end plate 20 to its respective bearing.
  • the rim 30 of the end plate 20 is shaped to define the plurality of flexural elements 36 (here shown as 48 in number) by a series of cut-outs in the form of circular apertures 40, slots 42 which extend from said apertures to the outer edge of said rim, and a multiplicity of arcuate cut-outs 44 which are disposed between the slots 42.
  • the diameter of the apertures 40, the width of the slots 42 and the extend of peripheral penetration of the arcuate cut-outs 44 are such, when taken together with he thickness of the rim 30, as to proportion the flexural elements 36 so that when they are subjected to a force which is radial of the end plate 20, the spring arm will bend or yield in the plane of the rim 30 to narrow the slots 42. Bending of the spring arms or flexural elements 36 occurs only in the plane of the applied force and has no normal component to stress the hub 32 or cause any cross-coupling In other words, the axes of movement of the flexural elements 36 are substantially perpendicular to the plane of the rim 30.
  • the means for defining the flexural elements 36 could all be defined at the same time as by a single punching operation from a steel disc.
  • the disc itself could be formed into the modified concave or dishlike shape as by forging or the like.
  • punching, broaching, milling or other machine operations could be employed in forming the end plate 20.
  • the flexural elements 36 need not be formed by round holes 40, straight radial slots 42, and arcuate cut-outs 44. Rather, any means for shaping rim 30 to define the flexural elements which will flex in the plane of the rim 30 when subjected to radial forces comes within he scope of the present invention. It is desirable that the flexural elements be shaped so that a portion thereof be subjectable to radial forces, such as the portion 46, and that the rim 30 be shaped so that the flexural elements are able to operate substantially independently of one another. With these criteria recognized by the skilled art worker, the particular form of means for defining the flexural elements 36 will be a matter of design choice.
  • the circular apertures 40 are twenty four in number and are equally spaced at intervals, and the arcuate cut'outs 44 are disposed equidistant between adjacent apertures 40.
  • the slots 42 are all radially extending and each of their main axes pass through the center of the aperture 40 which each slot communicates.
  • the end plates 20 may be pressed into cavities 28, in the rim 18 to forming an interference fit, the three components being held together by virtue of the resiliency of the flexural element 36.
  • Bearings 22 are pressed into apertures 38 in the hubs 32 of the discs 20 and the rotor assembly.
  • a gyroscope or the like having its rotating mass concentrated principally in the annular rim of a rotating member in the form of a hollow flywheel, and in which the member serves as the rotor with respect to a fixed stator mounted internally of the rotor, said stator having a rotor support means and means for mounting said rotating member on said rotor support means, the improvement comprising: said mounting means including a disc supporting said rim for the rotation about the axis of rotation, said disc having a substantially planar and unitary marginal edge portion including a plurality of outwardly extending flexural elements proportioned to flex in the plane of said marginal edge portion and about axis substantially perpendicular to said planar edge portion in response to a radial compressive force.
  • cut-outs include a plurality of equispaced apertures in said marginal edge portion, a plurality of radially extending slots, one for each aperture, extending from said apertures to the peripheral edge of said disc, and a plurality of arcuate cut-outs in said peripheral edge disposed equidistant between said apertures.
  • said disc further includes a hub disposed in a plane substantially parallel to said marginal edge portion, and a web connecting said hub to said marginal edge portion.
  • cut-outs include a plurality of equispaced apertures in said marginal edge portion, a plurality of radially extending slots, one for each aperture, ending from said apertures to the peripheral side edge of said disc, and a plurality of arcuate cut-outs in said peripheral edge disposed equidistant between said apertures.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Gyroscopes (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
US00026209A 1970-04-07 1970-04-07 End plate for gyroscope rotor Expired - Lifetime US3719092A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US2620970A 1970-04-07 1970-04-07

Publications (1)

Publication Number Publication Date
US3719092A true US3719092A (en) 1973-03-06

Family

ID=21830492

Family Applications (1)

Application Number Title Priority Date Filing Date
US00026209A Expired - Lifetime US3719092A (en) 1970-04-07 1970-04-07 End plate for gyroscope rotor

Country Status (5)

Country Link
US (1) US3719092A (enrdf_load_stackoverflow)
CA (1) CA936020A (enrdf_load_stackoverflow)
DE (1) DE2116585A1 (enrdf_load_stackoverflow)
FR (1) FR2089165A5 (enrdf_load_stackoverflow)
IL (1) IL36539A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3822602A (en) * 1972-10-18 1974-07-09 Ferranti Ltd Axially adjustable gyro
US20090124168A1 (en) * 2007-11-12 2009-05-14 Ar Racing S.R.L. Stabilizing device for radio-controlled motorcycles
US20130305850A1 (en) * 2012-05-21 2013-11-21 Honeywell International Inc. Control moment gyroscopes including rotors having radially-compliant spokes and methods for the manufacture thereof
US8590407B2 (en) 2010-05-18 2013-11-26 Honeywell International Inc. Control moment gyroscope assembly and method for making the same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2646376C3 (de) * 1976-10-14 1985-03-14 Bodenseewerk Gerätetechnik GmbH, 7770 Überlingen Kreisel
US4343203A (en) * 1977-07-01 1982-08-10 Sperry Corporation Rotor structure for gyroscopic apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2199024A (en) * 1939-01-27 1940-04-30 Sperry Gyroscope Co Inc Temperature compensation for gyroscopes
US2410002A (en) * 1946-10-29 Gyroscope
US2771778A (en) * 1955-10-24 1956-11-27 Lear Inc End plate for a gyroscope rotor or the like
US3446081A (en) * 1966-03-11 1969-05-27 Fabrication D Instr De Mesure Elastic mounted gyroscope motor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2410002A (en) * 1946-10-29 Gyroscope
US2199024A (en) * 1939-01-27 1940-04-30 Sperry Gyroscope Co Inc Temperature compensation for gyroscopes
US2771778A (en) * 1955-10-24 1956-11-27 Lear Inc End plate for a gyroscope rotor or the like
US3446081A (en) * 1966-03-11 1969-05-27 Fabrication D Instr De Mesure Elastic mounted gyroscope motor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3822602A (en) * 1972-10-18 1974-07-09 Ferranti Ltd Axially adjustable gyro
US20090124168A1 (en) * 2007-11-12 2009-05-14 Ar Racing S.R.L. Stabilizing device for radio-controlled motorcycles
US8590407B2 (en) 2010-05-18 2013-11-26 Honeywell International Inc. Control moment gyroscope assembly and method for making the same
US20130305850A1 (en) * 2012-05-21 2013-11-21 Honeywell International Inc. Control moment gyroscopes including rotors having radially-compliant spokes and methods for the manufacture thereof
US8919213B2 (en) * 2012-05-21 2014-12-30 Honeywell International Inc. Control moment gyroscopes including rotors having radially-compliant spokes and methods for the manufacture thereof

Also Published As

Publication number Publication date
CA936020A (en) 1973-10-30
DE2116585A1 (de) 1971-10-28
IL36539A (en) 1973-06-29
FR2089165A5 (enrdf_load_stackoverflow) 1972-01-07
IL36539A0 (en) 1971-11-29

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