DAMPER

• US 20190331190A1
• Filed: 06/13/2017
• Published: 10/31/2019
• Est. Priority Date: 06/15/2016
• Status: Active Grant

• Current Assignee: Oiles Corporation
• Original Assignee: Oiles Corporation
• Inventors: WATANABE, Hiroshi, KANEKO, Ryohei
• Granted Patent: US 10,900,536 B2
• Time in Patent Office: Days
• CPC Class Codes: B60G 2202/22 Rotary Damper
• CPC Class Codes: F16F 2230/0047 Measuring, indicating
• CPC Class Codes: F16F 9/12 Devices with one or more rotary vanes turning in the fluid any throttling effect being immaterial, i.e. damping by viscous shear effect only F16F9/53 takes precedence; pivoting supports for apparatus or articles placed on stands or trestles F16M11/06
• CPC Class Codes: F16F 9/14 Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
• CPC Class Codes: F16F 9/145 involving only rotary movement of the effective parts wing closers or openers with fluid brakes of the rotary type E05F3/14
• CPC Class Codes: F16F 9/18 with a closed cylinder and a piston separating two or more working spaces therein
• CPC Class Codes: F16F 9/3242 of cylinder ends, e.g. caps
• CPC Class Codes: F16F 9/36 Special sealings, including sealings or guides for piston-rods F16F9/325, F16F9/3485 take precedence; arrangements for filling via piston rod sealing or guiding means F16F9/432 ; sealing of moving parts in general F16J15/16 - F16J15/56
• CPC Class Codes: F16J 15/16 between relatively-moving surfaces F16J15/50, F16J15/52 take precedence; bellows pistons F16J3/06; piston-rings or ring sealings of similar construction F16J9/00

Abstract

Provided is a damper wherein viscous fluid which fills a circular cylinder chamber is more reliably prevented from leaking.

A rotary damper (1) includes: a first seal ring (8a) of an elastic body, arranged between a through-hole (23) of a circular cylinder chamber (21) in a case (2) and a lower end of a rotor body of a rotor (3); and a second seal ring (8b) of an elastic body, arranged between a through-hole (60) in a lid (6) and an upper end of the rotor body. The first seal ring (8a) has: an outer peripheral surface with a width in a direction of a center axis of the circular cylinder chamber (21), which is pressed against an inner peripheral surface of the through-hole (23); and an inner peripheral surface with a width in the direction of the center axis of the circular cylinder chamber (21), which is pressed against an outer peripheral surface of the lower end of the rotor body, and also a second seal ring (8b) has: an outer peripheral surface with a width in the direction of the center axis of the circular cylinder chamber (21), which is pressed against an inner peripheral surface of the through-hole (60); and an inner peripheral surface with a width in the direction of the center axis of the circular cylinder chamber (21), which pressed against an outer peripheral surface of the upper end of the rotor body.

Claims

1. A damper generating a damping force in reaction to an external force by limiting a movement of a viscous fluid, the damper comprising:

a fluid holding chamber having an opening portion and holding the viscous fluid;

a resistance generating member inserted into the fluid holding chamber, the resistance generating member being movable relative to the fluid holding chamber by the external force;

a volume changing means partitioning an inside of the fluid holding chamber, and the volume changing means compressing one of areas and expanding another of the areas in the partitioned fluid holding chamber with a movement of the resistance generating member relative to the fluid holding chamber;

a flow path connecting between the areas in the fluid holding chamber partitioned by the volume changing means; and

an elastic member of annular shape, arranged between the resistance generating member and the fluid holding chamber;

the elastic member comprising;

an inner peripheral surface having a width in a direction of a center axis of the fluid holding chamber and being pressed against the resistance generating member; and

an outer peripheral surface having a width in the direction of the center axis of the fluid holding chamber and being pressed against the fluid holding chamber.

2. A damper according to claim 1, wherein:

at least one of the inner and outer peripheral surfaces of the elastic member is a surface flatly in the direction of the center axis of the fluid holding chamber.

3. A damper according to claim 1, wherein:

at least one of the inner and outer peripheral surfaces of the elastic member is an arc surface having a radius in a cross-section in the direction of the center axis of the fluid holding chamber, the radius being longer than half of a radial width of the elastic member.

4. A damper according to claim 1, wherein:

the width, in the direction of the center axis of the fluid holding chamber, of one of the inner peripheral surface and the outer peripheral surface of the elastic member is smaller than the width, in the direction of the center axis of the fluid holding chamber, of another of the inner peripheral surface and the outer peripheral surface of the elastic member.

5. A damper according to claim 1, wherein:

at least one of the inner peripheral surface and the outer peripheral surface of the elastic member comprises a groove circumferentially formed.

6. A damper according to claim 1, wherein:

the elastic member comprises;

an inner periphery side annular portion having a rectangular cross section and including the inner peripheral surface of the elastic member;

an outer periphery side annular portion having a rectangular cross section and including the outer peripheral surface of the elastic member; and

a coupling portion connecting between the inner periphery side annular portion and the outer periphery side annular portion, the coupling portion having a width smaller than widths of the outer periphery side annular portion and the outer periphery side annular portion, in the direction of the center axis of the fluid holding chamber.

7. A damper according to claim 1, wherein:

the resistance generating member comprises a step being formed on the outer peripheral surface facing the opening portion of the fluid holding chamber and preventing the elastic member from moving axially inwardly.

8. A damper according to claim 1, wherein:

the fluid holding chamber comprises a step being formed on an inner peripheral surface of the opening portion facing the resistance generating member and preventing the elastic member from moving axially outwardly.

9. A damper according to claim 1, further comprising:

a check valve closing the flow path on linearly moving the resistance generating member relative to the fluid holding chamber along the center axis of the fluid holding chamber in a first moving direction, or on rotating the resistance generating member relative to the fluid holding chamber in a first rotating direction, and opening the flow path on linearly moving the resistance generating member relative to the fluid holding chamber along the center axis of the fluid holding chamber in a second moving direction opposite to the first moving direction or on rotating the resistance generating member relative to the fluid holding chamber in a second rotating direction opposite to the first rotating direction.

10. A damper according to claim 1, wherein:

the fluid holding chamber comprises;

a case of a circular cylinder shape, having an opening end portion at one end; and

a lid attached to the opening end portion of the case and keeping the viscous fluid in the case;

the opening end portion of the fluid holding chamber is formed at least one of another end of the case and the lid.

11. A damper according to claim 1, wherein:

the resistance generating member comprises a rotor body inserted into the fluid holding chamber and housed in the fluid holding chamber to allow for rotating relative to the fluid holding chamber by a rotating force applied as the external force;

the volume changing means comprises;

a partitioning portion formed along the center axis of the fluid holding chamber, the partitioning portion projecting radially inward from the inner peripheral surface of the fluid holding chamber and partitioning an inside of the fluid holding chamber; and

a vane formed along the center axis of the fluid holding chamber, the vane projecting radially outward from the outer peripheral surface of the rotor body with an end surface of the vane placed close to the inner peripheral surface of the fluid holding chamber and partitioning the inside of the fluid holding chamber.

12. A damper according to claim 11, wherein:

the flow path is provided to one of the partitioning portion of the volume changing means and the vane, and connects between the area in the fluid holding chamber partitioned by the partitioning portion and the vane.

13. A damper according to claim 2, wherein:

the width, in the direction of the center axis of the fluid holding chamber, of one of the inner peripheral surface and the outer peripheral surface of the elastic member is smaller than the width, in the direction of the center axis of the fluid holding chamber, of another of the inner peripheral surface and the outer peripheral surface of the elastic member.

14. A damper according to claim 3, wherein:

the width, in the direction of the center axis of the fluid holding chamber, of one of the inner peripheral surface and the outer peripheral surface of the elastic member is smaller than the width, in the direction of the center axis of the fluid holding chamber, of another of the inner peripheral surface and the outer peripheral surface of the elastic member.

15. A damper according to claim 2, wherein:

at least one of the inner peripheral surface and the outer peripheral surface of the elastic member comprises a groove circumferentially formed.

16. A damper according to claim 3, wherein:

at least one of the inner peripheral surface and the outer peripheral surface of the elastic member comprises a groove circumferentially formed.

17. A damper according to claim 4, wherein:

at least one of the inner peripheral surface and the outer peripheral surface of the elastic member comprises a groove circumferentially formed.

18. A damper according to claim 2, wherein:

the elastic member comprises;

an inner periphery side annular portion having a rectangular cross section and including the inner peripheral surface of the elastic member;

an outer periphery side annular portion having a rectangular cross section and including the outer peripheral surface of the elastic member; and

a coupling portion connecting between the inner periphery side annular portion and the outer periphery side annular portion, the coupling portion having a width smaller than widths of the outer periphery side annular portion and the outer periphery side annular portion, in the direction of the center axis of the fluid holding chamber.

19. A damper according to claim 3, wherein:

the elastic member comprises;

an inner periphery side annular portion having a rectangular cross section and including the inner peripheral surface of the elastic member;

an outer periphery side annular portion having a rectangular cross section and including the outer peripheral surface of the elastic member; and

a coupling portion connecting between the inner periphery side annular portion and the outer periphery side annular portion, the coupling portion having a width smaller than widths of the outer periphery side annular portion and the outer periphery side annular portion, in the direction of the center axis of the fluid holding chamber.

20. A damper according to claim 5, wherein:

the elastic member comprises;

an inner periphery side annular portion having a rectangular cross section and including the inner peripheral surface of the elastic member;

an outer periphery side annular portion having a rectangular cross section and including the outer peripheral surface of the elastic member; and

a coupling portion connecting between the inner periphery side annular portion and the outer periphery side annular portion, the coupling portion having a width smaller than widths of the outer periphery side annular portion and the outer periphery side annular portion, in the direction of the center axis of the fluid holding chamber.