Multi-ring inertial energy storage wheel having tapered ring mounting members

• US 4,102,220 A
• Filed: 07/01/1976
• Issued: 07/25/1978
• Est. Priority Date: 07/01/1976
• Status: Expired due to Term

• Current Assignee: Electric Power Research Institute Incorporated
• Original Assignee: Electric Power Research Institute Incorporated
• Inventors: Brobeck, William M.
• Primary Examiner(s): Bentley, Stephen C.
• Application Number:
  US05/701,825
• Time in Patent Office: 754 Days
• Field of Search: 74/572, 74/573 R, 74/573 F, 74/574, 310/67, 403/355, 403/365, 403/319
• US Class Current: 74/572.11
• CPC Class Codes: F16C 15/00 Construction of rotary bodies to resist centrifugal force flywheels, correction weights F16F15/30, F16F15/32
• CPC Class Codes: F16C 2361/55 Flywheel systems
• CPC Class Codes: F16F 15/30 Flywheels F16F15/16, F16F15/28 take precedence; suppression of vibrations in rotating systems using elastic members or friction-damping members moving with the system, i.e. split flywheels or single masses connected to a hub by elastic members or friction-damping members F16F15/12; rotary-body aspects in general F16C13/00, F16C15/00
• CPC Class Codes: Y02E 60/16 Mechanical energy storage, e.g. flywheels or pressurised fluids
• CPC Class Codes: Y10T 74/2119 Structural detail, e.g., material, configuration, superconductor, discs, laminated, etc.

Abstract

An inertial energy storage wheel defined by a plurality of independent, concentric rotor ring assemblies and a center hub rotatable about a vertical axis. The hub includes a plurality of spaced-apart, radially oriented teeth having sides parallel to the axis of rotation which diverge in a radially outward direction, which lie on radii having their origin at the axis of rotation of the wheel, and which are engaged by correspondingly shaped holes of the innermost ring assembly carried by the hub. The holes have radially outwardly diverging vertically oriented side walls which snugly engage the sides of the teeth when the wheel is at rest as well as during high speed operation of the wheel when the rotor ring assembly dilates and moves radially outward with respect to the teeth. Additional rotor ring assemblies are concentrically disposed about the innermost assembly and connected thereto so that the rotor ring assemblies can dilate by differential amounts. The rotor ring assemblies are constructed of a plurality of coaxial rings held together by U-shaped clamps and the tooth receiving holes of the innermost assembly are defined by opposing, aligned grooves in opposing end faces of the rings.

Claims

1. In an inertial energy storage wheel having at least one rotor, the rotor including an axially oriented end face and a plurality of radially oriented grooves in the end face, a plurality of radially oriented connecting members having a shape complementary to a shape of the grooves and disposed therein, the connecting members protruding in a radial direction past the grooves, and mounting means radially spaced from the rotor and attached to the connecting members for the transmission of rotational forces between the rotor and such means, the improvement to the rotor and the connecting member comprising:

a connecting member having diverging sides extensions of which generally intersect at an axis of the rotor, and a groove in the rotor having side walls which diverge in accordance with the sides of the connecting member to form a snug fit between the sides and the side walls when the rotor is at rest, the divergency of the sides and of the side walls having a magnitude and an orientation such that upon dilation of the rotor during its rotation, the rotor and the connecting members are permitted to move with respect to each other in a radial direction while the sides and the side walls of the connecting members and the grooves, respectively, remain in mutual contact and engagement and maintain their snug fit.

2. An inertial energy storage wheel according to claim 1 wherein the connecting members comprise spaced-apart connecting members which are independent of each other.

3. An inertial energy storage wheel according to claim 2 wherein the mounting means comprises another rotor having an end face provided with grooves that match and engage portions of the members protruding from the first mentioned rotor.

4. An inertial energy storage wheel according to claim 1 wherein each rotor is defined by a plurality of coaxial rings having like inner and outer diameters and opposing end faces, wherein each of the opposing end faces defines corresponding, aligned grooves, wherein the connecting member is disposed in the aligned, opposing grooves of the adjacent rings and simultaneously engages the rings, and further including means constraining the rings to each other.

5. An inertial energy storage wheel according to claim 4 wherein the constraining means comprises a plurality of U-shaped clamp means having an axially oriented center section and a pair of radially oriented lips engaging free end faces of the rings and thereby securing the rings to each other.

6. An inertial energy storage wheel according to claim 1 wherein the mounting means and the connecting members are integrally constructed.

7. An inertial energy storage wheel according to claim 1 wherein the mounting means comprises a central hub for the wheel.

8. An inertial energy storage wheel according to claim 1 wherein the rotor comprises a plurality of opposing, coaxial rings having opposing, axially oriented end faces, wherein axially aligned pairs of grooves are defined in the opposing end faces of the ring, and wherein each connecting member is disposed in both grooves of each pair of aligned grooves and simultaneously engages side walls of both rings.

9. An inertial energy storage wheel according to claim 1 including means constraining the rings to each other.

10. An inertial energy storage wheel according to claim 9 wherein the constraining means comprises a plurality of circumferentially spaced-apart, U-shaped clamps, each clamp having an axially oriented center section and radially oriented lips protruding from ends of the center section and engaging free end faces of the rings to thereby secure the rings to each other.

11. An inertial energy storage wheel comprising:

a hub for rotation about its axis'"'"' at least one rotor ring assembly defining a plurality of circumferentially spaced-apart, radially oriented holes, each hole having side walls which are substantially parallel to and extensions of which intersect at an axis of rotation of the hub and which diverge with respect to each other in a radially outward direction; and

connecting members disposed in the holes for connecting the ring assembly to the hub, the connecting members including axially oriented, radially outwardly diverging sides dimensioned and shaped complementarily to the side walls of the holes for snugly engaging the side walls, the connecting members being further attached to the hub for rotation therewith and for the transmission of rotational forces between the ring assembly and the hub;

the angle of inclination between the sides and between the side walls being chosen so that the side walls of the holes and the sides of the connecting members, respectively, remain in snug engagement during rotation of the wheel, the circumferential dilation of the ring assembly and a corresponding relative radial movement between the connecting members and the holes, to thereby prevent radial play between the hub and the ring assembly and a resulting virbrational instability of the wheel.

12. An inertial storage wheel according to claim 11 wherein the connecting members comprise radially oriented teeth projecting from the hub.

13. An inertial energy storage wheel according to claim 12 wherein the teeth and the hub are integrally constructed.

14. An inertial energy storage wheel according to claim 13 wherein the teeth extend over less than a full radial width of the ring assembly.

15. An inertial energy storage wheel according to claim 14 wherein the teeth extend over less than about one-half the width of the ring assembly.

16. An inertial energy storage wheel according to claim 13 wherein the hub comprises a disc portion extending from a center of the hub towards but terminating short of the teeth, the disc portion being defined by radially outwardly converging sides, and an annular portion disposed between the disc portion and the teeth, integrally constructed therewith and having an enlarged cross-section relative to the disc portion to thereby distribute radial forces from the teeth over the disc and prevent excessive stress concentrations in the hub.

17. An inertial energy storage wheel comprising:

a rotatable hub including a disc-shaped center section and a plurality of spaced-apart, radially oriented teeth extending from a periphery of the center section, each tooth being defined by a pair of spaced-apart sides oriented transversely to the center section and being angularly inclined with respect to each other so that extensions of the sides converge at the axis of rotation of the hub;

a rotor assembly carried by the teeth for rotation with the hub, the rotor assembly being defined by a plurality of coaxial rings with opposing, axially oriented end faces, the rings including a plurality of aligned groove pairs in the opposing end faces so that each pair of opposing grooves defines a tooth receiving, radially oriented hole, each groove including sides walls which are transverse to the center portion of the hub and which converge in a radially inward direction complementarily to the sides of the teeth so that each hole has radially inwardly converging, axially oriented side surfaces snugly engaging the sides of the teeth when the wheel is at rest; and

means securing the rings to each other with the teeth disposed in the holes;

whereby the high speed rotation of the wheel and a resulting dilation of the rotor assembly causes relative radial motion between the teeth and the holes while the sides of the teeth and the side surfaces of the holes remain in snug, play-free engagement during such high speed rotation of the wheel.

18. An inertial energy storage wheel according to claim 17 including at least one additional, second rotor assembly disposed radially outward of and concentric with the first mentioned rotor assembly;

the second rotor assembly being defined by at least two axially aligned outer rings;

means for securing the rings of the second rotor assembly to each other in an axially aligned relationship; and

means connecting the first mentioned and the second rotor assemblies for the transmission of rotational forces therebetween, the connecting means including means permitting relative radial movements between the rotor assemblies.

19. An inertial energy storage wheel according to claim 18 wherein the second rotor assembly connecting means comprises a plurality of circumferentially spaced, radially aligned, open apertures in the first and the second rotor ring assemblies;

torque transmitting bars disposed in the radially aligned apertures for interconnecting the first and second rotor assemblies and for accommodating differential relative dilations of the first and second rotor ring assemblies during high speed operation of the wheel, a first portion of each bar disposed in the first rotor ring assembly having a rectangular cross-section defined by a pair of sides oriented transversely to the hub center section and diverging in a radially inward direction;

the apertures in the first rotor assembly having a configuration complementary to the configuration of the first bar portion and including a pair of vertically oriented side walls which are transverse to the hub center portion;

the vertical sides and the side walls of the bars and the corresponding apertures, respectively, diverging in a radially inward direction at an angle chosen so that during a relative radial movement of the bar over a distance equal to the differential dilation between the first and the second rotor assemblies during high speed operation of the wheel the vertical bar sides and the side walls of the corresponding apertures in the first rotor assembly remain in continued, snug engagement.

20. An inertial energy storage wheel according to claim 19 wherein the bar includes a second, radially outwardly directed portion having a substantially constant, rectangular cross-section, and wherein the aperture in the second ring assembly engaged by the second portion has a configuration complementary to that of the second portion.

21. An inertial energy storage wheel according to claim 17 wherein the center portion of the hub has a cross-section which decreases from adjacent a center of the hub to the periphery of the center portion, and including an annular element disposed between and integrally constructed with the center portion and the teeth, the annular element having a thickness greater than the thickness of the center portion adjacent its periphery.