Vibration control unit and vibration control body

• US 20030052247A1
• Filed: 07/30/2002
• Published: 03/20/2003
• Est. Priority Date: 08/03/2001
• Status: Active Grant

• Current Assignee: Tokkyokiki Corporation
• Original Assignee: Tokkyokiki Corporation
• Inventors: Nakashima, Masataka, Yasuda, Masashi, Minbu, Shohei, Pan, Gongyu
• Granted Patent: US 7,278,623 B2
• Time in Patent Office: Days
• US Class Current: 248/559
• CPC Class Codes: F16F 15/02 Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems F16F15/005 takes precedence ; layered products B32B; suppression of vibration in ships B63; relieving load on bearings, using magnetic means F16C39/06
• CPC Class Codes: F16F 2230/14 Ball joints; Spherical support elements

Abstract

A vibration control unit in which a rolling element having a first curved surface that is a convex surface is interposed between a first and second members, and the rolling element is allowed rolling with respect to the first member in the first curved surface thereof. The rolling element has a second curved surface that faces the first curved surface and is formed of a curved surface center different from that of the first curved surface. As the rolling element, resulting from an additional force applied on the first and second curved surfaces, rolls with respect to the first member, the second member vibrates with a restoring force determined based on an average curvature radius of the first and second curved surfaces of the rolling element and a distance between curved surface centers of the first and second curved surfaces.

Claims

1. A vibration control unit:

wherein a rolling element having a first curved surface that is a convex surface is interposed between a first member and a second member and capable of rolling with respect to the first member in the first curved surface of the rolling element;

wherein the rolling element has a second curved surface that faces the first curved surface and is formed of a curved surface center different from that of the first curved surface; and

wherein the rolling element is configured so that as the rolling element, resulting from an additional force applied on the first and second curved surfaces, rolls with respect to the first member, the second member vibrates with a restoring force that is determined based on an average curvature radius of the first and second curved surfaces of the rolling element and a distance between the curved surface centers of the first and second curved surfaces.

2. A vibration control unit as set forth in claim 1:

wherein the second curved surface is a convex surface; and

wherein the rolling element is capable of rolling with respect to the first member in the first curved surface and at the same time capable of rolling with respect to the second member in the second curved surface.

3. A vibration control unit as set forth in claim 1:

wherein the second curved surface is a concave surface; and

wherein an intermediate body capable of rolling or sliding with respect to the second curved surface is interposed between the second member and the rolling element.

18. A vibration removal structure for precision instrument:

wherein by the use of the vibration control unit set forth in claim 1, a floor vibration is isolated.

19. A vibration isolation structure of a vibration generator:

wherein by the use of the vibration control unit set forth in claim 1, a vibration of instrument mounted on the unit is isolated from transmitting to a floor.

20. A vibration immunity structure:

wherein by the use-of the vibration control unit set forth in claim 1, a transmission of an earthquake motion is isolated.

21. A vibration suppression structure:

wherein, by supporting an additional mass of vibration suppression apparatus by the use of the vibration control unit set forth in claim 1, a characteristic period is allowed synchronizing.

4. A vibration control body:

wherein the vibration control body is formed so that an overall height thereof is H, and first and second curved surfaces thereof that are convex surfaces that face to each other satisfy R1+R2>

H>

h (R1 and R2, respectively, denote average curvature radii of the first and second curved surfaces, and h denotes a distance between curved surface centers of the first and second curved surfaces).

5. A vibration control body as set forth in claim 4:

wherein the vibration control body is formed symmetrically with respect to a central axis, and the first and second curved surfaces thereof are spherical surfaces formed at both ends of the central axis so as to satisfy R1+R2>

H>

h (R1 and R2, respectively, denote radii of the first and second curved surfaces, and h denotes a distance between curved surface centers of the first and second curved surfaces).

6. A vibration control body as set forth in claim 4:

wherein at least any one of the first and second curved surfaces has an area where a curvature radius increases continuously as departs from the central axis.

7. A vibration control unit:

wherein at least the second curved surface of the first and second curved surfaces of one or a plurality of vibration control bodies set forth in claim 4 is supported with a plate-like member.

8. A vibration control unit:

wherein one or a plurality of vibration control bodies that is serially disposed, each one of which being the vibration control body set forth in claim 4, and at least two plate-like members are alternately disposed with the plate-like members as both ends and so that each of the vibration control bodies is supported by the plate-like members in the first and second convex surfaces, respectively.

12. A vibration control unit as set forth in claim 8:

wherein three or more of the vibration control bodies having the same height are disposed in parallel between two of the plate-like members.

13. A vibration control unit as set forth in claim 8:

wherein, further outside of the plate-like member disposed at an endmost portion, a vibration control mechanism is disposed to dampen vibration transmission in an axial direction of the vibration control body.

14. A vibration control unit as set forth in claim 8:

wherein an auxiliary member that generates a restoring force in a direction opposite to a direction of an action of a shearing force acted on the first or second curved surface is further disposed.

9. A vibration control body:

wherein the vibration control body has a thickness t at a center portion thereof, and a first curved surface that is a concave surface and a second curved surface that is a convex surface, both of which facing to each other; and

wherein the first and second curved surfaces are formed so as to satisfy (R2−

R1)>

t (R1 and R2, respectively, denote average curvature radii of the first and second curved surfaces).

10. A vibration control unit, comprising:

one or a plurality of the vibration control bodies, each of which being set forth in claim 9;

an intermediate body disposed so as to come into contact with the first curved surface; and

plate-like members that sandwich the vibration control body and the intermediate body so that the intermediate body is allowed to roll or slide with respect to the first curved surface;

wherein the vibration control body is capable of rolling with respect to the plate-like member that comes into contact with the vibration control body in the second curved surface.

11. A vibration control unit:

wherein an intermediate ball and vibration control body complex in which an intermediate body is disposed so as to come into contact with the first curved surface of one or a plurality of vibration control bodies disposed serially, each of which being the vibration control body set forth in claim 9, and at least two plate-like members are alternately disposed with the plate-like members as both ends and so that the vibration control body is capable of rolling with respect to the plate-like member that comes into contact with the vibration control body in the second curved surface thereof.

15. A vibration control unit as set forth in claim 11:

wherein, between two of the plate-like members, three or more of the vibration control bodies having the same height are disposed in parallel.

16. A vibration control unit as set forth in claim 11:

wherein, further outside of the plate-like member disposed at an endmost portion, a vibration control mechanism for dampening a vibration transmission in an axial direction of the vibration control body is further disposed.

17. A vibration control unit as set forth in claim 11:

wherein an auxiliary member that generates a restoring force in a direction opposite to a direction of an action of a shearing force acted on the first or second curved surface is further disposed.